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Volume 45,Issue 7,2018 Table of Contents
2018, 45(7):1-7.
Abstract:
Aiming at solving the problem that the conventional current chopping control (CCC) of switched reluctance motor (SRM) had the disadvantages of unfixed switching frequency and poor current tracking performance, a fixed frequency deadbeat predictive current control (DPCC) algorithm was proposed. The discrete prediction model of SRM was established based on the accurate analytic fitting of SRM static electromagnetic characteristics. In order to reduce the torque ripple, the deadbeat theory was used to calculate the voltage needed at the next moment to realize accurate tracking of the motor reference current. In order to further improve the efficiency, a new type torquesharing function was used instead of the traditional liner function. Based on the test data of the test prototype, a simulation platform was built in MATLAB/Simulink, and the simulation analysis was carried out. The simulation results showed that the proposed fixed frequency DPCC had a smaller current tracking error compared with the conventional CCC method, it also could effectively reduce the torque ripple of the SRM and improve the system efficiency.
Aiming at solving the problem that the conventional current chopping control (CCC) of switched reluctance motor (SRM) had the disadvantages of unfixed switching frequency and poor current tracking performance, a fixed frequency deadbeat predictive current control (DPCC) algorithm was proposed. The discrete prediction model of SRM was established based on the accurate analytic fitting of SRM static electromagnetic characteristics. In order to reduce the torque ripple, the deadbeat theory was used to calculate the voltage needed at the next moment to realize accurate tracking of the motor reference current. In order to further improve the efficiency, a new type torquesharing function was used instead of the traditional liner function. Based on the test data of the test prototype, a simulation platform was built in MATLAB/Simulink, and the simulation analysis was carried out. The simulation results showed that the proposed fixed frequency DPCC had a smaller current tracking error compared with the conventional CCC method, it also could effectively reduce the torque ripple of the SRM and improve the system efficiency.
2018, 45(7):8-14, 22.
Abstract:
In order to improve the control performance of the permanent magnet synchronous motor speed control system, combined with sliding mode control and fractional calculus theory, a fractional order integral sliding mode speed controller and an improved sliding mode observer were designed. For the speed controller, the design of a new reaching law based on inverse hyperbolic sine function, which weakened the system chattering effectively, the fractional order control provided the system with more degree of freedom and it could reduce the chattering more and enhance the robustness of the system. Aiming at the observer, a new sliding mode observer based on the new reaching law of fal function was designed to obtain the back EMF value, and then utilized the FOPLL to extract the rotational speed information in the back EMF. The highprecision rotor position and velocity estimation value could be obtained. The simulation experiments verified the feasibility and validity of the proposed method.
In order to improve the control performance of the permanent magnet synchronous motor speed control system, combined with sliding mode control and fractional calculus theory, a fractional order integral sliding mode speed controller and an improved sliding mode observer were designed. For the speed controller, the design of a new reaching law based on inverse hyperbolic sine function, which weakened the system chattering effectively, the fractional order control provided the system with more degree of freedom and it could reduce the chattering more and enhance the robustness of the system. Aiming at the observer, a new sliding mode observer based on the new reaching law of fal function was designed to obtain the back EMF value, and then utilized the FOPLL to extract the rotational speed information in the back EMF. The highprecision rotor position and velocity estimation value could be obtained. The simulation experiments verified the feasibility and validity of the proposed method.
2018, 45(7):15-22.
Abstract:
Aiming at the problem of speed sensorless control of high speed permanent magnet synchronous motor (PMSM), a speed sensorless control strategy of PMSM based on discrete back electromotive force (EMF) estimation was presented. The discrete back EMF estimation was implemented with three design considerations. First, a discrete dq current observer was designed to eliminate the inductive crosscoupling effect in the backEMF estimation. Then, a delay compensation model was designed to compensate for the voltage error caused by digitaltoanalog conversion. A more accurate discrete model to overcome the deviation between the estimated back EMF and the actual back EMF caused by the digital implementation. Finally, the drive tests of high speed PMSM were carried out. The test results verified the performance of the proposed high speed sensorless speed control scheme of PMSM.
Aiming at the problem of speed sensorless control of high speed permanent magnet synchronous motor (PMSM), a speed sensorless control strategy of PMSM based on discrete back electromotive force (EMF) estimation was presented. The discrete back EMF estimation was implemented with three design considerations. First, a discrete dq current observer was designed to eliminate the inductive crosscoupling effect in the backEMF estimation. Then, a delay compensation model was designed to compensate for the voltage error caused by digitaltoanalog conversion. A more accurate discrete model to overcome the deviation between the estimated back EMF and the actual back EMF caused by the digital implementation. Finally, the drive tests of high speed PMSM were carried out. The test results verified the performance of the proposed high speed sensorless speed control scheme of PMSM.
2018, 45(7):23-29.
Abstract:
Aiming at the problems of the traditional fieldweakening technology such as large current and torque ripple and current regulator easily saturated in deep fieldweakening operation, a deep fieldweakening control strategy based on increment and error integration of qaxis current was presented. Firstly, the qaxis current change rate was slowed down by qaxis current error integral control to restrain the current regulator from saturation. Then according to the curve of the maximum torque per voltage limit daxis current, giving the qaxis current increment, replanning PMSM fieldweakening current trajectory. Combined with the current loop fuzzy PI, to further inhibit the current and torque ripple in deep fieldweakening operation. The simulation results showed that under the fluxweakening control strategy, the ripple of current and torque and the saturation of the current regulator in deep fieldweakening operation were obviously restrained, and the system was stable.
Aiming at the problems of the traditional fieldweakening technology such as large current and torque ripple and current regulator easily saturated in deep fieldweakening operation, a deep fieldweakening control strategy based on increment and error integration of qaxis current was presented. Firstly, the qaxis current change rate was slowed down by qaxis current error integral control to restrain the current regulator from saturation. Then according to the curve of the maximum torque per voltage limit daxis current, giving the qaxis current increment, replanning PMSM fieldweakening current trajectory. Combined with the current loop fuzzy PI, to further inhibit the current and torque ripple in deep fieldweakening operation. The simulation results showed that under the fluxweakening control strategy, the ripple of current and torque and the saturation of the current regulator in deep fieldweakening operation were obviously restrained, and the system was stable.
2018, 45(7):30-37.
Abstract:
Aiming at the problem of commutation torque ripple in brushless DC motor (BLDCM), a method to inhibit torque ripple of BLDCM based on double H-bridge converter was proposed. Through the compensating or reducing current generated by the double Hbridge converter circuit, the fluctuation of the noncommutation phase current could be reduced so as to inhibit the torque ripple of the BLDCM. The simulation model of BLDCM was constructed in MATLAB/Simulink and was conducted comparative experiment, compared with the traditional PID control method, the new method’s current ripple of noncommutation phase decreased about 70% at high speed and 40% at low speed, respectively. Meanwhile, the balanced torque ripple decreased about 80%. The results showed that the new method has some practical value.
Aiming at the problem of commutation torque ripple in brushless DC motor (BLDCM), a method to inhibit torque ripple of BLDCM based on double H-bridge converter was proposed. Through the compensating or reducing current generated by the double Hbridge converter circuit, the fluctuation of the noncommutation phase current could be reduced so as to inhibit the torque ripple of the BLDCM. The simulation model of BLDCM was constructed in MATLAB/Simulink and was conducted comparative experiment, compared with the traditional PID control method, the new method’s current ripple of noncommutation phase decreased about 70% at high speed and 40% at low speed, respectively. Meanwhile, the balanced torque ripple decreased about 80%. The results showed that the new method has some practical value.
2018, 45(7):38-44, 72.
Abstract:
Multichannel bidirectional Buck/Boost converters, served as energy exchange interfaces had often been used in energy storage systems. The basic modeling method was used to build small signal AC model for threechannel bidirectional Buck/Boost converter. Base on the open loop characteristic of the converter, the voltage and current compensation network were designed, following this, a new double closedloop control strategy based on feedforward correction was proposed. The paper adopted the MATLAB simulation research to prove the correctness of the proposed control strategy. The Simulation results showed that the control strategy could provide good dynamic and steadystate performance for the threechannel bidirectional Buck/Boost converters, and at the same time, it demonstrates good robustness which could adapt to wide range of load variation.
Multichannel bidirectional Buck/Boost converters, served as energy exchange interfaces had often been used in energy storage systems. The basic modeling method was used to build small signal AC model for threechannel bidirectional Buck/Boost converter. Base on the open loop characteristic of the converter, the voltage and current compensation network were designed, following this, a new double closedloop control strategy based on feedforward correction was proposed. The paper adopted the MATLAB simulation research to prove the correctness of the proposed control strategy. The Simulation results showed that the control strategy could provide good dynamic and steadystate performance for the threechannel bidirectional Buck/Boost converters, and at the same time, it demonstrates good robustness which could adapt to wide range of load variation.
2018, 45(7):45-50.
Abstract:
In order to realize the complex control algorithm and the small delay demand for the high performance servo controller, a design method of high performance servo controller based on FPGA and DSP was studied. The FPGA completes the current loop, coordinate transformation, SVPWM and reading current and position. DSP was responsible for the communication between speed loop, position loop and host computer. Thus system could realize complex control algorithm and reduce delay to the minimum, so as to ensure the best performance of the controller. In addition, the communication mode between the two chips and the design of the three loops controller were also introduced in detail. The final experimental data showed that the speed loop bandwidth of the servo controller can reach 100 Hz, and the steady speed accuracy was within 1 r/min under the rated speed, and the positioning accuracy can reach 0.02 degrees, which confirms the effectiveness of the controller structure.
In order to realize the complex control algorithm and the small delay demand for the high performance servo controller, a design method of high performance servo controller based on FPGA and DSP was studied. The FPGA completes the current loop, coordinate transformation, SVPWM and reading current and position. DSP was responsible for the communication between speed loop, position loop and host computer. Thus system could realize complex control algorithm and reduce delay to the minimum, so as to ensure the best performance of the controller. In addition, the communication mode between the two chips and the design of the three loops controller were also introduced in detail. The final experimental data showed that the speed loop bandwidth of the servo controller can reach 100 Hz, and the steady speed accuracy was within 1 r/min under the rated speed, and the positioning accuracy can reach 0.02 degrees, which confirms the effectiveness of the controller structure.
2018, 45(7):51-55.
Abstract:
Based on the motor design parameters of a certain type missile launch device, using of performance optimization analysis finite element analysis software Ansys and the Motor CAD thermal analysis software, a reasonable design scheme was given. And the validation of the measured data showed that the scheme design of accuracy could reach more than 93.5%, maximum surface temperature rise of motor was 19.2 ℃, and the simulation value close to the scheme design was reasonable.
Based on the motor design parameters of a certain type missile launch device, using of performance optimization analysis finite element analysis software Ansys and the Motor CAD thermal analysis software, a reasonable design scheme was given. And the validation of the measured data showed that the scheme design of accuracy could reach more than 93.5%, maximum surface temperature rise of motor was 19.2 ℃, and the simulation value close to the scheme design was reasonable.
2018, 45(7):56-60, 66.
Abstract:
The particularity of magnetic circuits of fractionalslot concentrated winding motor made the saturation of d and qaxis magnetic circuits more prominent. The frozen permeability method could be used to calculate the precise inductance of the motor when considering saturation. By using the finite element software, this method was applied to the 10pole 12slot fractionalslot concentrated winding prototype, and the results of this method are compared with those calculated by the traditional method. For the sensorless control of motor realized by high frequency signal injection method, the fundamental frequency inductances were used in the high frequency mathematical model. By using the frozen permeability method, the high frequency inductances in the highfrequency voltage mathematical equation were determined, and the fundamental frequency inductances were replaced by high frequency inductances to improve the accuracy of the sensorless control algorithm.
The particularity of magnetic circuits of fractionalslot concentrated winding motor made the saturation of d and qaxis magnetic circuits more prominent. The frozen permeability method could be used to calculate the precise inductance of the motor when considering saturation. By using the finite element software, this method was applied to the 10pole 12slot fractionalslot concentrated winding prototype, and the results of this method are compared with those calculated by the traditional method. For the sensorless control of motor realized by high frequency signal injection method, the fundamental frequency inductances were used in the high frequency mathematical model. By using the frozen permeability method, the high frequency inductances in the highfrequency voltage mathematical equation were determined, and the fundamental frequency inductances were replaced by high frequency inductances to improve the accuracy of the sensorless control algorithm.
2018, 45(7):61-66.
Abstract:
Aimed at problems of extended Kalman filter (EKF) linearization exists nonlinear error and dependence on known noise distribution in realtime pose estimation, an adaptive linear Kalman filtering based on PnP for pose estimation was proposed. The PnP pose estimation solution strategy was introduced into the Kalman filter observation equation, and the Kalman filter recursive parameters were adaptively adjusted by realtime estimation of the statistical error parameters of the dynamic equation. The proposed algorithm had high accuracy, fixed the observation vector dimension of the observation equation, and improves the practicality of the algorithm. Through simulation experiments, the accuracy of pose estimation of this algorithm and EKF was compared. Through quantization error analysis, it was proved that this method can improve the precision of threedimensional motion pose estimation and verified the effectiveness of the method.
Aimed at problems of extended Kalman filter (EKF) linearization exists nonlinear error and dependence on known noise distribution in realtime pose estimation, an adaptive linear Kalman filtering based on PnP for pose estimation was proposed. The PnP pose estimation solution strategy was introduced into the Kalman filter observation equation, and the Kalman filter recursive parameters were adaptively adjusted by realtime estimation of the statistical error parameters of the dynamic equation. The proposed algorithm had high accuracy, fixed the observation vector dimension of the observation equation, and improves the practicality of the algorithm. Through simulation experiments, the accuracy of pose estimation of this algorithm and EKF was compared. Through quantization error analysis, it was proved that this method can improve the precision of threedimensional motion pose estimation and verified the effectiveness of the method.
2018, 45(7):67-72.
Abstract:
The working principle of doublestators eddy current brake (DSECB) was introduced, then the brake torque formula of it was derived on the based of the theory of equivalent magnetic circuit, and the DSECB was simulated in 3D using finite element method. The influence of the electromagnetic parameters of the DSECB on the characteristic curve of the braking torque was analyzed in detail, which provided a reference for the optimal design of the DSECB.
The working principle of doublestators eddy current brake (DSECB) was introduced, then the brake torque formula of it was derived on the based of the theory of equivalent magnetic circuit, and the DSECB was simulated in 3D using finite element method. The influence of the electromagnetic parameters of the DSECB on the characteristic curve of the braking torque was analyzed in detail, which provided a reference for the optimal design of the DSECB.
2018, 45(7):73-77, 83.
Abstract:
Through the analysis of the characteristics of fuel cells, the main research for vehiclemounted fuel cell power electronics converter was given. Through the optimization of the topology of the Boost converter, the improvement of the efficiency and the improvement of the control method, the design of an efficient and reliable converter suitable for the fuel cell with a large voltage conversion ratio was designed. Through experimental tests, it was proved that the converter could realize stable output operation of the fuel cell, effectively protect the fuel cell, further prolong the life of the fuel cell, and prevent the battery characteristics from being lowered.
Through the analysis of the characteristics of fuel cells, the main research for vehiclemounted fuel cell power electronics converter was given. Through the optimization of the topology of the Boost converter, the improvement of the efficiency and the improvement of the control method, the design of an efficient and reliable converter suitable for the fuel cell with a large voltage conversion ratio was designed. Through experimental tests, it was proved that the converter could realize stable output operation of the fuel cell, effectively protect the fuel cell, further prolong the life of the fuel cell, and prevent the battery characteristics from being lowered.
2018, 45(7):78-83.
Abstract:
In order to solve the ventilation and heat dissipation problem of highpower and lowspeed asynchronous motor effectively, based on the heat flow coupling simulation analysis and calculation method, a 2 800 kW and 8pole ninephase asynchronous motor was taken as an example to analyze the distribution of air and temperature rise distribution in the motor with the width distance of the stator tooth platen of the top suction forced aircooled motor. As well as the influence of internal wind resistance characteristics, the matching scheme was screened. At the same time, the heat transfer characteristics of the ninephase subtracted thin insulating structure and the threephase high voltage insulation structure were compared and analyzed. Finally, the motor temperature rise experiment test was carried out, the temperature field calculation results were in good agreement with the test results, verifying the analysis and calculation of the accuracy and effectiveness of the simulation based on heat flow coupling.
In order to solve the ventilation and heat dissipation problem of highpower and lowspeed asynchronous motor effectively, based on the heat flow coupling simulation analysis and calculation method, a 2 800 kW and 8pole ninephase asynchronous motor was taken as an example to analyze the distribution of air and temperature rise distribution in the motor with the width distance of the stator tooth platen of the top suction forced aircooled motor. As well as the influence of internal wind resistance characteristics, the matching scheme was screened. At the same time, the heat transfer characteristics of the ninephase subtracted thin insulating structure and the threephase high voltage insulation structure were compared and analyzed. Finally, the motor temperature rise experiment test was carried out, the temperature field calculation results were in good agreement with the test results, verifying the analysis and calculation of the accuracy and effectiveness of the simulation based on heat flow coupling.
2018, 45(7):84-88, 115.
Abstract:
In order to respond positively to “Made in China 2025” and “Notice on Developing a Green Manufacturing System from Office of the Ministry of industry and information technology”, aiming at the current status of lack of evaluation requirements for green factory in motor production industry in China, evaluation content, indicators and methods for green factory of motor production industry had been studied in this article combining the characteristics of material use, production process, production equipment, product, energy use, major pollutant discharge and so on of China’s motor manufacturing enterprises. The study made a positive contribution in fully promoting green manufacturing in China’s motor production industry, accelerating the green transformation and upgrading of the motor production industry, building green manufacturing system for the motor production industry, and improving the international competitiveness of China’s motor production industry.
In order to respond positively to “Made in China 2025” and “Notice on Developing a Green Manufacturing System from Office of the Ministry of industry and information technology”, aiming at the current status of lack of evaluation requirements for green factory in motor production industry in China, evaluation content, indicators and methods for green factory of motor production industry had been studied in this article combining the characteristics of material use, production process, production equipment, product, energy use, major pollutant discharge and so on of China’s motor manufacturing enterprises. The study made a positive contribution in fully promoting green manufacturing in China’s motor production industry, accelerating the green transformation and upgrading of the motor production industry, building green manufacturing system for the motor production industry, and improving the international competitiveness of China’s motor production industry.
2018, 45(7):89-92, 121.
Abstract:
The traditional power measurement algorithm based on DFT needs to obtain the phase and amplitude of the current fundamental wave vector according to the result of current’s DFT, and then the operation would be performed according to the phase and amplitude of the phasevoltage fundamental wave vector obtained in phaselocked loop.Introduce a simplified power measurement algorithm. The real part and imaginary part of the current DFT’s resultcan be used with the phase voltage amplitude to get the active power and reactive power by selecting proper starting point of DFT, which would reduce the amount of calculation and the pressure of DSP. The algorithm was simulated through Simulink software. The compare ofresults obtained by simulation and theoretical calculation proved the feasibility and availability of the algorithm.
The traditional power measurement algorithm based on DFT needs to obtain the phase and amplitude of the current fundamental wave vector according to the result of current’s DFT, and then the operation would be performed according to the phase and amplitude of the phasevoltage fundamental wave vector obtained in phaselocked loop.Introduce a simplified power measurement algorithm. The real part and imaginary part of the current DFT’s resultcan be used with the phase voltage amplitude to get the active power and reactive power by selecting proper starting point of DFT, which would reduce the amount of calculation and the pressure of DSP. The algorithm was simulated through Simulink software. The compare ofresults obtained by simulation and theoretical calculation proved the feasibility and availability of the algorithm.
2018, 45(7):93-96.
Abstract:
The test system for the performance test of servo motor and system characteristic was designed adopts Sinamics S120. It gave a detailed account on design considerations and software hardware structure of the system. The testing method of servo motor and system test was also discussed. The system had to be used and works steadily. The field testing showed that it was easy to handle and meet measurement requirements.
The test system for the performance test of servo motor and system characteristic was designed adopts Sinamics S120. It gave a detailed account on design considerations and software hardware structure of the system. The testing method of servo motor and system test was also discussed. The system had to be used and works steadily. The field testing showed that it was easy to handle and meet measurement requirements.
2018, 45(7):97-101.
Abstract:
Since the broader the range of speed regulation and the higher the power density of traction motor was needed, the vibration noise was increased. Therefor aiming at the generation mechanism of electromagnetic vibration noise of traction motor, the identification method of characteristic frequency was proposed suitable for different electromagnetic vibration noise source. The magnetic field harmonic of motor stator and rotor was analyzed, thus the mathematical analytical expression on field frequency is elicited. Then the degree and frequency of electromagnetic excitation force was researched, thereby the characteristic frequency of different electromagnetic vibration noise source was summed up. Through the diagnostic analysis on the testing data of electromagnetic vibration noise, the accuracy of diagnostic method proposed was verified.
Since the broader the range of speed regulation and the higher the power density of traction motor was needed, the vibration noise was increased. Therefor aiming at the generation mechanism of electromagnetic vibration noise of traction motor, the identification method of characteristic frequency was proposed suitable for different electromagnetic vibration noise source. The magnetic field harmonic of motor stator and rotor was analyzed, thus the mathematical analytical expression on field frequency is elicited. Then the degree and frequency of electromagnetic excitation force was researched, thereby the characteristic frequency of different electromagnetic vibration noise source was summed up. Through the diagnostic analysis on the testing data of electromagnetic vibration noise, the accuracy of diagnostic method proposed was verified.
2018, 45(7):102-108, 115.
Abstract:
By studying the close relationship between the motor performance and the load during brushless DC motor (BLDCM) operation in electric vehicle, aiming at the application of BLDCM, an improved generalized predictive control algorithm was proposed. By analyzing the mathematical model of BLDCM in simulation model, the control system of BLDCM was established and simulated. The simulation results showed that, compared with the traditional PID control algorithm, the load steadystate accuracy and maximum speed fluctuation of BLDCM could be significantly improved when the improved generalized prediction algorithm was adopted. The method had the advantages of fast response, high control precision, Interference ability and other characteristics. Therefore, this simulation control model could meet the requirements of BLDCM running in electric vehicle.
By studying the close relationship between the motor performance and the load during brushless DC motor (BLDCM) operation in electric vehicle, aiming at the application of BLDCM, an improved generalized predictive control algorithm was proposed. By analyzing the mathematical model of BLDCM in simulation model, the control system of BLDCM was established and simulated. The simulation results showed that, compared with the traditional PID control algorithm, the load steadystate accuracy and maximum speed fluctuation of BLDCM could be significantly improved when the improved generalized prediction algorithm was adopted. The method had the advantages of fast response, high control precision, Interference ability and other characteristics. Therefore, this simulation control model could meet the requirements of BLDCM running in electric vehicle.
2018, 45(7):109-115.
Abstract:
In order to study the electromagnetic properties of double fed induction wind generator (DFIG) with the ITSCFSW, a finite element model based on Ansys Maxwell was established. Then the simulations under three operations conditions such as noload operation conditions, gridconnected operation and varying degrees of the stator winding interturn short circuit fault were completed. According to theoretical formulas of characterization, quantitative analysis of vibration, current and temperature characterization of air gap flux density distortion in three working conditions was done based on energy perspective. Finally, the advantages and disadvantages of each characterization were compared, and the feasibility analysis of diagnosis was carried out. The stator current was determined as the characteristic factor to reflect the air gap magnetic field of the ITSCFSW, and the vibration and temperature were complement and verification for fault detection, which would provide a theoretical basis for the signal feature selection of generator’s fault diagnosis.
In order to study the electromagnetic properties of double fed induction wind generator (DFIG) with the ITSCFSW, a finite element model based on Ansys Maxwell was established. Then the simulations under three operations conditions such as noload operation conditions, gridconnected operation and varying degrees of the stator winding interturn short circuit fault were completed. According to theoretical formulas of characterization, quantitative analysis of vibration, current and temperature characterization of air gap flux density distortion in three working conditions was done based on energy perspective. Finally, the advantages and disadvantages of each characterization were compared, and the feasibility analysis of diagnosis was carried out. The stator current was determined as the characteristic factor to reflect the air gap magnetic field of the ITSCFSW, and the vibration and temperature were complement and verification for fault detection, which would provide a theoretical basis for the signal feature selection of generator’s fault diagnosis.
2018, 45(7):116-121.
Abstract:
The reactive power compensation capability of doubly fed induction generator (DFIG) can not meet the demand of largescale wind power grid. Although the introduction of fixed capacitors could provide reactive power compensation, as the system was affected by the power coupling, it could not effectively maintain realtime voltage stability. A control strategy that static var generator (SVG) and DFIG coordinated compensation reactive power was proposed, and the power system stabilizer (PSS) was introduced to suppress the low frequency oscillation of the system, make full use of DFIG wind turbine capacity itself to send reactive power, the configuration capacity of SVG was reduced. The DFIG wind turbine model is established on the MATLAB/Simulink software simulation platform, the simulation results showed that the control strategy could complete the continuous reactive power compensation, effectively maintain the voltage stability and enhance the transmission capacity of the system.
The reactive power compensation capability of doubly fed induction generator (DFIG) can not meet the demand of largescale wind power grid. Although the introduction of fixed capacitors could provide reactive power compensation, as the system was affected by the power coupling, it could not effectively maintain realtime voltage stability. A control strategy that static var generator (SVG) and DFIG coordinated compensation reactive power was proposed, and the power system stabilizer (PSS) was introduced to suppress the low frequency oscillation of the system, make full use of DFIG wind turbine capacity itself to send reactive power, the configuration capacity of SVG was reduced. The DFIG wind turbine model is established on the MATLAB/Simulink software simulation platform, the simulation results showed that the control strategy could complete the continuous reactive power compensation, effectively maintain the voltage stability and enhance the transmission capacity of the system.
2018, 45(7):122-126.
Abstract:
The traditional PID variable pitch control strategy had large fluctuant rotation speed and low following features of the pitch angle. It was focused that the output power of the wind turbine was stable at rated power above the rated wind speed. For the inertia and delay of the variable pitch system, the problem of long dynamic adjustment time and large amount of overshoot are caused in the control process. A TS fuzzy weighted dual mode pitch control strategy based on PID control and fuzzy control was presented. The directdrive variable pitch PM wind turbine simulation model has been built with Simulink, through the simulation verification. The result showed that this method had the advantages of fuzzy control and PID control, had the accuracy of pitch angle higher and the response speed faster, so that the power of generator was more closed to rated power.
The traditional PID variable pitch control strategy had large fluctuant rotation speed and low following features of the pitch angle. It was focused that the output power of the wind turbine was stable at rated power above the rated wind speed. For the inertia and delay of the variable pitch system, the problem of long dynamic adjustment time and large amount of overshoot are caused in the control process. A TS fuzzy weighted dual mode pitch control strategy based on PID control and fuzzy control was presented. The directdrive variable pitch PM wind turbine simulation model has been built with Simulink, through the simulation verification. The result showed that this method had the advantages of fuzzy control and PID control, had the accuracy of pitch angle higher and the response speed faster, so that the power of generator was more closed to rated power.
2018, 45(7):127-130.
Abstract:
On the premise of intelligent manufacturing, the process model of intelligent shaft material processing was designed on the premise of intelligent manufacturing. On the basis of the combination of the dual power intelligent lathe, the integrated industrial control machine was centrally coordinated the machine tool combination, the truss robot and the joint robot, and the automatic up and down feeding system was used to make up an intelligent automatic spindle processing unit. The automatic processing unit had dual protection function of hardware and software. It has strong detection, monitoring and running function, and brings the digital communication system to the intelligent digital workshop management system.
On the premise of intelligent manufacturing, the process model of intelligent shaft material processing was designed on the premise of intelligent manufacturing. On the basis of the combination of the dual power intelligent lathe, the integrated industrial control machine was centrally coordinated the machine tool combination, the truss robot and the joint robot, and the automatic up and down feeding system was used to make up an intelligent automatic spindle processing unit. The automatic processing unit had dual protection function of hardware and software. It has strong detection, monitoring and running function, and brings the digital communication system to the intelligent digital workshop management system.
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
沪ICP备16038578号-3
Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
