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Volume 44,Issue 11,2017 Table of Contents
2017, 44(11):1-5, 11.
Abstract:
Since motor parameter disturbance could cause current static error and oscillation in PWM predictive current control of permanent magnet synchronous motor (PMSM), PWM predictive current control based on Luenberger observer was proposed. Firstly, system parameter disturbance was introduced into the motor voltage equation, and Luenberger observer with excellent performance in parameter perturbation was constructed to observe the system disturbance. Then, Luenberger disturbance observer was discretized, and system stability was analyzed by pole assignment. Finally, disturbance from the observer was introduced into the voltage equation with parameter disturbance to provide realtime disturbance compensation for the algorithm. Simulation results showed that the proposed algorithm could rapidly observe the disturbance of the system without static error, effectively avoid the current static error and oscillation caused by inductance parameter error, and improved the robustness of current prediction algorithm.
Since motor parameter disturbance could cause current static error and oscillation in PWM predictive current control of permanent magnet synchronous motor (PMSM), PWM predictive current control based on Luenberger observer was proposed. Firstly, system parameter disturbance was introduced into the motor voltage equation, and Luenberger observer with excellent performance in parameter perturbation was constructed to observe the system disturbance. Then, Luenberger disturbance observer was discretized, and system stability was analyzed by pole assignment. Finally, disturbance from the observer was introduced into the voltage equation with parameter disturbance to provide realtime disturbance compensation for the algorithm. Simulation results showed that the proposed algorithm could rapidly observe the disturbance of the system without static error, effectively avoid the current static error and oscillation caused by inductance parameter error, and improved the robustness of current prediction algorithm.
2017, 44(11):6-11.
Abstract:
Brushless DC motor (BLDCM) was a multivariable, strong coupling, nonlinear, timevarying complex control system, the use of traditional PID control was difficult to meet the needs, so in the BLDCM control precision speed control problems, Based on the traditional PID control fuzzy control design fuzzy PID control, and on the basis of the variable domain method used to design a variable universe fuzzy PID controller. Then, using BLDCM as model, the simulation model was established by MATLAB. Simulation and experimental results showed that the BLDCM with variable universe fuzzy control had the advantages of faster response speed, smaller overshoot and higher control precision compared with the traditional BLDCM.
Brushless DC motor (BLDCM) was a multivariable, strong coupling, nonlinear, timevarying complex control system, the use of traditional PID control was difficult to meet the needs, so in the BLDCM control precision speed control problems, Based on the traditional PID control fuzzy control design fuzzy PID control, and on the basis of the variable domain method used to design a variable universe fuzzy PID controller. Then, using BLDCM as model, the simulation model was established by MATLAB. Simulation and experimental results showed that the BLDCM with variable universe fuzzy control had the advantages of faster response speed, smaller overshoot and higher control precision compared with the traditional BLDCM.
2017, 44(11):12-17.
Abstract:
Environmental pollution and energy crisis directly promoted the traditional fuel cars to the development of environmentfriendly electric vehicles (EVs). As one of the key components of EVs, motor drive control system directly affected prospects of EVs in future. In the motor drive control system operation process, the interior permanent magnet synchronous motor (IPMSM) used a relatively simple id=0 control mode could not meet the high torque requirements of automobile. Due to a large number of discrete data points, the lookup table control mode of traditional maximum torque per ampere (MTPA) would seriously affect the speed response of system. To solve above problems, an improved MTPA control method with equivalent integrated current vector control was presented. At first, the mathematical model of permanent magnet synchronous motor (PMSM) was established to analyze the basic principle of id=0 and MTPA vector control mode to present a novel MTPA control method. To compare the two methods of vector controls, the feasibility and superiority of integrated equivalent current control of MTPA was verified by simulation and prototype experiment.
Environmental pollution and energy crisis directly promoted the traditional fuel cars to the development of environmentfriendly electric vehicles (EVs). As one of the key components of EVs, motor drive control system directly affected prospects of EVs in future. In the motor drive control system operation process, the interior permanent magnet synchronous motor (IPMSM) used a relatively simple id=0 control mode could not meet the high torque requirements of automobile. Due to a large number of discrete data points, the lookup table control mode of traditional maximum torque per ampere (MTPA) would seriously affect the speed response of system. To solve above problems, an improved MTPA control method with equivalent integrated current vector control was presented. At first, the mathematical model of permanent magnet synchronous motor (PMSM) was established to analyze the basic principle of id=0 and MTPA vector control mode to present a novel MTPA control method. To compare the two methods of vector controls, the feasibility and superiority of integrated equivalent current control of MTPA was verified by simulation and prototype experiment.
2017, 44(11):18-25.
Abstract:
Considering the problem of over many current sensors used in fivephase permanent magnet synchronous motor control system, a new method of current reconstruction for fivephase permanent magnet synchronous motor was proposed. This method used only two current sensors to realize full acquisition of fivephase current, could effectively reduce the cost and complexity of the hardware circuit. The reconstruction precision and speed could meet the needs of fivephase permanent magnet synchronous motor control. Finally, the proposed method was validated in MATLAB. Results showed the correctness and effectiveness of the proposed method.
Considering the problem of over many current sensors used in fivephase permanent magnet synchronous motor control system, a new method of current reconstruction for fivephase permanent magnet synchronous motor was proposed. This method used only two current sensors to realize full acquisition of fivephase current, could effectively reduce the cost and complexity of the hardware circuit. The reconstruction precision and speed could meet the needs of fivephase permanent magnet synchronous motor control. Finally, the proposed method was validated in MATLAB. Results showed the correctness and effectiveness of the proposed method.
2017, 44(11):26-31, 37.
Abstract:
On the basis of previous research, the control strategy of permanent magnet synchronous motor (PMSM) with high speed of load capacity was promoted, and the control strategy could overcome the weakness that the motor at the highest speed could not be loaded, high reliability and easy to implement. The algorithm of the control strategy includes the weak magnetic control of PMSM and the over modulation control of voltage space vector, so that the motor could be controlled in a wide range of speed. In order to verify the control strategy, the simulation model of interior permanent magnet synchronous motor (IPMSM) was built, the experimental platform was built, the simulation and experiment were carried out, and the feasibility and effectiveness of the control strategy were verified by simulation and experiment.
On the basis of previous research, the control strategy of permanent magnet synchronous motor (PMSM) with high speed of load capacity was promoted, and the control strategy could overcome the weakness that the motor at the highest speed could not be loaded, high reliability and easy to implement. The algorithm of the control strategy includes the weak magnetic control of PMSM and the over modulation control of voltage space vector, so that the motor could be controlled in a wide range of speed. In order to verify the control strategy, the simulation model of interior permanent magnet synchronous motor (IPMSM) was built, the experimental platform was built, the simulation and experiment were carried out, and the feasibility and effectiveness of the control strategy were verified by simulation and experiment.
6 Design of Robust Backstepping Controller for Permenent Magnet LinearSynchronous Motor Servo Systems
2017, 44(11):32-37.
Abstract:
A robust backstepping controller for permanent magnet linear synchronous motor (PMLSM) servo systems to meet the requirements of strong robust and high precision was presented. To solve the problems of lowaccuracy, difficult parameters tuning and weak robust, an adaptive controller and a backstepping one were combined. The introduction of adaptive mechanism released the priori knowledge of upper bounds on disturbance and overcomed the chattering problem of the control law. Meanwhile, the characteristics and the bad impacts of highfrequency noise in feedback control systems were analyzed, and a low pass filter was applied to suppress the highfrequency noise. Finally, the effectiveness of the proposed controller and the suppression of the highfrequency noise were verified in the experimental platform, made by Googol company. This paper could provide references to the practicality of advanced control theory.
A robust backstepping controller for permanent magnet linear synchronous motor (PMLSM) servo systems to meet the requirements of strong robust and high precision was presented. To solve the problems of lowaccuracy, difficult parameters tuning and weak robust, an adaptive controller and a backstepping one were combined. The introduction of adaptive mechanism released the priori knowledge of upper bounds on disturbance and overcomed the chattering problem of the control law. Meanwhile, the characteristics and the bad impacts of highfrequency noise in feedback control systems were analyzed, and a low pass filter was applied to suppress the highfrequency noise. Finally, the effectiveness of the proposed controller and the suppression of the highfrequency noise were verified in the experimental platform, made by Googol company. This paper could provide references to the practicality of advanced control theory.
2017, 44(11):38-41, 49.
Abstract:
Based on the control of threephase inverter based on virtual synchronous generator, the double loop control system was composed of capacitor voltage and current feedback. Among them, the current loop and voltage loop were proportional integral control. However, the traditional double loop control had such shortcomings as low precision and slow response speed, The whole fuzzy control system had the function of adjusting the parameters according to the nonlinear system error of the system. On the basis of this, a control strategy of virtual synchronous motor based on the combination of double loop control and fuzzy PI was proposed. A detailed analysis of the fuzzy parameters after loop control setting, effectiveness and the method was proved by simulation research.
Based on the control of threephase inverter based on virtual synchronous generator, the double loop control system was composed of capacitor voltage and current feedback. Among them, the current loop and voltage loop were proportional integral control. However, the traditional double loop control had such shortcomings as low precision and slow response speed, The whole fuzzy control system had the function of adjusting the parameters according to the nonlinear system error of the system. On the basis of this, a control strategy of virtual synchronous motor based on the combination of double loop control and fuzzy PI was proposed. A detailed analysis of the fuzzy parameters after loop control setting, effectiveness and the method was proved by simulation research.
2017, 44(11):42-49.
Abstract:
For the traditional direct torque control (DTC) system of Brushless DC Motors (BLDCM), the motor was imposed on one fixed voltage vector during a control cycle, which lead to great torque ripples and inconstant switching frequency. In order to suppress the torque ripples and keep the switching frequency constant so that the reliability of the system could be improved, the duty ratio control method was introduced into the DTC system of BLDCM and the effect of four duty ratio determination method for suppressing the torque ripples were studied. By using the duty ratio control method, the acting time of the active voltage vector and zero voltage vector during one control cycle were decided by the duty ratio, so the torque could be controlled more accurately and the torque ripples could be suppressed. The results of the simulation and experiments highlight the validation of the method proposed.
For the traditional direct torque control (DTC) system of Brushless DC Motors (BLDCM), the motor was imposed on one fixed voltage vector during a control cycle, which lead to great torque ripples and inconstant switching frequency. In order to suppress the torque ripples and keep the switching frequency constant so that the reliability of the system could be improved, the duty ratio control method was introduced into the DTC system of BLDCM and the effect of four duty ratio determination method for suppressing the torque ripples were studied. By using the duty ratio control method, the acting time of the active voltage vector and zero voltage vector during one control cycle were decided by the duty ratio, so the torque could be controlled more accurately and the torque ripples could be suppressed. The results of the simulation and experiments highlight the validation of the method proposed.
2017, 44(11):50-54.
Abstract:
Servo motor used in computer numerical control (CNC) need be controlled precisely and fast. But the current servo driver based on Proportion (P) for error was not good for the high performance application. A novel control method based on model identification was proposed. Firstly, a least square algorithm was used to obtain the servo driver model. Then, a compensation controller based on P controller was designed for driving the gain of over transfer function equal to 1, so that the output could track the input signal precisely. The experiments demonstrated that the proposed modeling method and control algorithm could achieve high control performance.
Servo motor used in computer numerical control (CNC) need be controlled precisely and fast. But the current servo driver based on Proportion (P) for error was not good for the high performance application. A novel control method based on model identification was proposed. Firstly, a least square algorithm was used to obtain the servo driver model. Then, a compensation controller based on P controller was designed for driving the gain of over transfer function equal to 1, so that the output could track the input signal precisely. The experiments demonstrated that the proposed modeling method and control algorithm could achieve high control performance.
2017, 44(11):55-60, 71.
Abstract:
According to the nonlinear, timevarying and strong coupling of the servo system of permanent magnet linear synchronous motor (PMLSM), a speed control strategy based on fuzzy neural network PID was designed, through fruit fly optimization algorithm (FOA) and frog leaping algorithm (FLA) made fruit fly optimization algorithmfrog leaping algorithm (FOAFLA), it real time adjust and optimized the structure parameters of fuzzy neural network, the output were suitable for PID controller of the best parameters kp、ki、kd, it had realized adaptive and intelligent control for PMLSM speed control. Simulation analysis and experimental results showed that, Using the PID speed controller of fuzzy neural network based on FOAFLA, the permanent magnet linear synchronous motor control system could get better control effect.
According to the nonlinear, timevarying and strong coupling of the servo system of permanent magnet linear synchronous motor (PMLSM), a speed control strategy based on fuzzy neural network PID was designed, through fruit fly optimization algorithm (FOA) and frog leaping algorithm (FLA) made fruit fly optimization algorithmfrog leaping algorithm (FOAFLA), it real time adjust and optimized the structure parameters of fuzzy neural network, the output were suitable for PID controller of the best parameters kp、ki、kd, it had realized adaptive and intelligent control for PMLSM speed control. Simulation analysis and experimental results showed that, Using the PID speed controller of fuzzy neural network based on FOAFLA, the permanent magnet linear synchronous motor control system could get better control effect.
2017, 44(11):61-66.
Abstract:
DualStator Permanent Magnet Brushless (DSPMBL) has great application value by itshigh mechanical integration and high torque density. However, DSPMBL can not be designed by current program because of its special structure. Probed into splicing the whole DSPMBL design as two parts design—inside motor&outside motor based on the RMxprt with traditional magnetic circuit method by split ratio of stator. Finally, the model’s performance would be verified by curve of magnetostatic airgap flux density and dynamic simulation.
DualStator Permanent Magnet Brushless (DSPMBL) has great application value by itshigh mechanical integration and high torque density. However, DSPMBL can not be designed by current program because of its special structure. Probed into splicing the whole DSPMBL design as two parts design—inside motor&outside motor based on the RMxprt with traditional magnetic circuit method by split ratio of stator. Finally, the model’s performance would be verified by curve of magnetostatic airgap flux density and dynamic simulation.
2017, 44(11):67-71.
Abstract:
The temperature rise of the motor was one of the main factors that affected the performance and reliability of the motor. At present, the three dimensional temperature field simulation method was adopted, but because of the complex structure of winding and the strong coupling of heat flux field,which affecting the accuracy of the calculation results largerly. The simplified modeling method of 3 kinds of stator end winding was established, and the simulation and analysis of the heat flux field of the induction motor was carried out by using the Fluent simulation software platform. The results showed that the model could be simplified as a twodimensional stator end winding structure of straightening bent upward, the simplified method had both advantages of short modeling time and high simulation precision. The conclusions could be used as a reference for the simulation of the heat flux field and shorting the design period of the motor.
The temperature rise of the motor was one of the main factors that affected the performance and reliability of the motor. At present, the three dimensional temperature field simulation method was adopted, but because of the complex structure of winding and the strong coupling of heat flux field,which affecting the accuracy of the calculation results largerly. The simplified modeling method of 3 kinds of stator end winding was established, and the simulation and analysis of the heat flux field of the induction motor was carried out by using the Fluent simulation software platform. The results showed that the model could be simplified as a twodimensional stator end winding structure of straightening bent upward, the simplified method had both advantages of short modeling time and high simulation precision. The conclusions could be used as a reference for the simulation of the heat flux field and shorting the design period of the motor.
2017, 44(11):72-78.
Abstract:
AlNiCo permanent magnet was used in doubly salient permanent magnet motor with nonrareearth (NREDSPM) to replace traditional rare earth permanent magnet, which could reduce the production cost of the motor, and the airgap magnetic field of NREDSPM could be adjusted by the magnetizing windings to improve the performance of the motor. However, due to the influence of the motor parameters, a large number of harmonics existed in the phase current of NREDSPM motor, which seriously affected the efficiency and stability of the motor. To solve this problem, a current loop control method based on PI controller parallel resonant regulator was adopted. The method was simple and easy to implement, and does not need to increase the hardware circuit cost, could effectively suppress the current harmonics. Experiments were finished on a 1.25 kW NREDSPM experimental platform, and the effectiveness of the method was verified by the experimental results.
AlNiCo permanent magnet was used in doubly salient permanent magnet motor with nonrareearth (NREDSPM) to replace traditional rare earth permanent magnet, which could reduce the production cost of the motor, and the airgap magnetic field of NREDSPM could be adjusted by the magnetizing windings to improve the performance of the motor. However, due to the influence of the motor parameters, a large number of harmonics existed in the phase current of NREDSPM motor, which seriously affected the efficiency and stability of the motor. To solve this problem, a current loop control method based on PI controller parallel resonant regulator was adopted. The method was simple and easy to implement, and does not need to increase the hardware circuit cost, could effectively suppress the current harmonics. Experiments were finished on a 1.25 kW NREDSPM experimental platform, and the effectiveness of the method was verified by the experimental results.
2017, 44(11):79-84.
Abstract:
Axial field fluxswitching permanent magnet (AFFSPM) machine was a novel machine with short axial length and high torque density. The 3D distributed magnetic flux of the AFFSPM machine required the 3D field analysis which increased the calculation time and cost of analysis and optimization. A nonlinear equivalent magnetic circuit model of the AFFSPM machine was built, and the static characteristics of the AFFSPM machine, including the airgap flux density, permanent magnetic flux linkage, back electromotive force and inductance characteristics were calculated and analyzed based on equivalent magnetic circuit model. The calculated results were compared with those predicted by 3D finite element method. The analysis results with two methods consist well, the feasibility of the proposed equivalent magnetic circuit model were verified.
Axial field fluxswitching permanent magnet (AFFSPM) machine was a novel machine with short axial length and high torque density. The 3D distributed magnetic flux of the AFFSPM machine required the 3D field analysis which increased the calculation time and cost of analysis and optimization. A nonlinear equivalent magnetic circuit model of the AFFSPM machine was built, and the static characteristics of the AFFSPM machine, including the airgap flux density, permanent magnetic flux linkage, back electromotive force and inductance characteristics were calculated and analyzed based on equivalent magnetic circuit model. The calculated results were compared with those predicted by 3D finite element method. The analysis results with two methods consist well, the feasibility of the proposed equivalent magnetic circuit model were verified.
2017, 44(11):85-88, 94.
Abstract:
Based on the Ansoft Maxwell, the factors affecting the performance of single phase stepping motor were analyzed. The results showed that operating temperature and input voltage significantly affected the performance of the motor, therefore, the application field and condition of the machine should be fully considered. Axiality and air gap, to an extent, had an effect on the performance of the motor, hence the optimal design of them should be guaranteed. Geometrical tolerances had minimal impact on the performance of the motor, which could be neglected.
Based on the Ansoft Maxwell, the factors affecting the performance of single phase stepping motor were analyzed. The results showed that operating temperature and input voltage significantly affected the performance of the motor, therefore, the application field and condition of the machine should be fully considered. Axiality and air gap, to an extent, had an effect on the performance of the motor, hence the optimal design of them should be guaranteed. Geometrical tolerances had minimal impact on the performance of the motor, which could be neglected.
2017, 44(11):89-94.
Abstract:
To make sure of the heating transfer and safe running of mine explosionproof motor which had special structure and applying situation such as small size, high power and terrible heat, it’s the key to design a rational and suitable watercooled structure. A program based on the heat transfer and hydrodynamic theory was compiled in this paper research on the watercooled structure and temperature rise of the YBSD motor. The calculation result was compared with the case and date from actual motor, then the feasibility and accuracy of the calculation method was verified, which provided a technological means.
To make sure of the heating transfer and safe running of mine explosionproof motor which had special structure and applying situation such as small size, high power and terrible heat, it’s the key to design a rational and suitable watercooled structure. A program based on the heat transfer and hydrodynamic theory was compiled in this paper research on the watercooled structure and temperature rise of the YBSD motor. The calculation result was compared with the case and date from actual motor, then the feasibility and accuracy of the calculation method was verified, which provided a technological means.
17 Outcome of Development on DC Motor less CommutatorGeneralized DC Motor Rather than Synchronous Motor
2017, 44(11):95-99.
Abstract:
The operational mechanism of DC motor with selfcontrolled frequency was explained at first. Sense on polar daxis was a prerequisite for selfcontrolled phase of armature current. Reform and evolution of the position sensor may be regarded as a mark of development on DC motor less commutator. The commutatorless motor was the forerunning of the development on DC motor less commutator. The successor was the motor system with selfcontrolled frequency consisted of the motorbody with sinusoidal current, including application of the transvector control technique. Sense on position and speed of polar daxis in order to selfcontrol the phase of armature current or voltage with the help of computerassisted controlling technique may be developed hereafter. It would gave an impetus to progress towards deepened development on DC motor less commutator. However, the outcome of development becomes of the generalized dc motor rather than synchronous motor.
The operational mechanism of DC motor with selfcontrolled frequency was explained at first. Sense on polar daxis was a prerequisite for selfcontrolled phase of armature current. Reform and evolution of the position sensor may be regarded as a mark of development on DC motor less commutator. The commutatorless motor was the forerunning of the development on DC motor less commutator. The successor was the motor system with selfcontrolled frequency consisted of the motorbody with sinusoidal current, including application of the transvector control technique. Sense on position and speed of polar daxis in order to selfcontrol the phase of armature current or voltage with the help of computerassisted controlling technique may be developed hereafter. It would gave an impetus to progress towards deepened development on DC motor less commutator. However, the outcome of development becomes of the generalized dc motor rather than synchronous motor.
2017, 44(11):100-105.
Abstract:
An ecore hybrid excited axial field fluxswitching permanent magnet (HEAFFSPM) machine, which was suitable for electrical vehicle drive, was developed. The electromagnetic performances of a 3phase 6/10 stator/rotorpole HEAFFSPM machine, including the airgap flux density, the PM flux linkage, the back electromotive force (backEMF), the electromagnetic torque, the torquecurrent characteristics, the winding inductances, and the field regulation capacity, were thoroughly investigated based on 3D finite element method (FEM). The influences of the rotor pole shape angle and rotor pole skewing on the backEMF and cogging torque were analyzed. It showed that the backEMF could be improved and the cogging torque could be reduced with trapezoidal rotor pole shape and skewed rotor pole. A 2 kW prototype was built and tested, which validated the FEM analysis. Results showed that the HEAFFSPM machine exhibits the essentially sinusoidal phase flux linkage and backEMF, good loadcarrying capacity and flexible fluxregulation capacity.
An ecore hybrid excited axial field fluxswitching permanent magnet (HEAFFSPM) machine, which was suitable for electrical vehicle drive, was developed. The electromagnetic performances of a 3phase 6/10 stator/rotorpole HEAFFSPM machine, including the airgap flux density, the PM flux linkage, the back electromotive force (backEMF), the electromagnetic torque, the torquecurrent characteristics, the winding inductances, and the field regulation capacity, were thoroughly investigated based on 3D finite element method (FEM). The influences of the rotor pole shape angle and rotor pole skewing on the backEMF and cogging torque were analyzed. It showed that the backEMF could be improved and the cogging torque could be reduced with trapezoidal rotor pole shape and skewed rotor pole. A 2 kW prototype was built and tested, which validated the FEM analysis. Results showed that the HEAFFSPM machine exhibits the essentially sinusoidal phase flux linkage and backEMF, good loadcarrying capacity and flexible fluxregulation capacity.
2017, 44(11):106-110, 117.
Abstract:
In order to find a new method to the online identification of inter turn shortcircuit fault of brushless excitation synchronous generator rotor, the change of electromagnetic properties was analysed and electrical parameters after the synchronous generator rotor windings occurred inter turn shortcircuit. According to the characteristic that the exciting current was increasing and the reactive power output was decreasing relatively, a method was put forward which uses generator reactive power output relative change rate which was calculated or measured before and after the fault as a practical criterion for identification of the severity of brushless excitation synchronous generator rotor windings inter turn shortcircuit fault. Finally, the relative experiment was carried out using the dynamic analog experiment unit.
In order to find a new method to the online identification of inter turn shortcircuit fault of brushless excitation synchronous generator rotor, the change of electromagnetic properties was analysed and electrical parameters after the synchronous generator rotor windings occurred inter turn shortcircuit. According to the characteristic that the exciting current was increasing and the reactive power output was decreasing relatively, a method was put forward which uses generator reactive power output relative change rate which was calculated or measured before and after the fault as a practical criterion for identification of the severity of brushless excitation synchronous generator rotor windings inter turn shortcircuit fault. Finally, the relative experiment was carried out using the dynamic analog experiment unit.
2017, 44(11):111-117.
Abstract:
Faced with high failure rate and large outage losses, offshore wind farms needed to find operation faults and provided faulttolerant mechanism as soon as possible doublyfed wind generators (DFIGs) opencircuit faulttolerant projects were built based on simon decision theory, which took power quality and wind turbine reliability as typical evaluation standards. The tolerant effect was evaluated combining the example that was doublyfed wind generators rotor side converter single phase open circuit fault. The results showed that timely and effective faulttolerant mechanism could raise availability, avoid fault deterioration and reduce economic losses caused by faults in offshore wind farms.
Faced with high failure rate and large outage losses, offshore wind farms needed to find operation faults and provided faulttolerant mechanism as soon as possible doublyfed wind generators (DFIGs) opencircuit faulttolerant projects were built based on simon decision theory, which took power quality and wind turbine reliability as typical evaluation standards. The tolerant effect was evaluated combining the example that was doublyfed wind generators rotor side converter single phase open circuit fault. The results showed that timely and effective faulttolerant mechanism could raise availability, avoid fault deterioration and reduce economic losses caused by faults in offshore wind farms.
2017, 44(11):118-123.
Abstract:
The characteristics of wind turbine, permanent magnet direct drive motor model, converter control strategy and the advantages and disadvantages of various power tracking control algorithms were analyzed. An optimization of maximum power point tracking (MPPT) control based on climbing search was proposed. The permanent magnet direct drive wind power generation system model was established and the tracking effect of the control method on the maximum power point was simulated by using MATLAB/Simulink. The result showed that the tracking control method could made the system get to new operating point fast and steady when the wind tubine starts or the wind speed changes and it could capture the maximum power of the wind energy. The control method and the correctness and effectiveness of the model had been verified.
The characteristics of wind turbine, permanent magnet direct drive motor model, converter control strategy and the advantages and disadvantages of various power tracking control algorithms were analyzed. An optimization of maximum power point tracking (MPPT) control based on climbing search was proposed. The permanent magnet direct drive wind power generation system model was established and the tracking effect of the control method on the maximum power point was simulated by using MATLAB/Simulink. The result showed that the tracking control method could made the system get to new operating point fast and steady when the wind tubine starts or the wind speed changes and it could capture the maximum power of the wind energy. The control method and the correctness and effectiveness of the model had been verified.
2017, 44(11):124-130.
Abstract:
A wind turbine generator improved simulator including wind shear and tower shadow effect was proposed. Based on 3phase backtoback converter platform, the control system was established on the mathematical models of the directdriven permanent magnet wind power generator, it contained wind shear and tower shadow effect. In order to simplify the equation of the speed ratio and torque, a curve fitting method based on Kalman filter was proposed. It built the virtual platform in MATLAB/Simulink, which simulates the output of current, voltage and power as the load was changed. With the effect and without the effect, the mechanical torque output was simulated respectively. The simulation results showed that the platform could simulate the operation characteristics of wind turbine generator.
A wind turbine generator improved simulator including wind shear and tower shadow effect was proposed. Based on 3phase backtoback converter platform, the control system was established on the mathematical models of the directdriven permanent magnet wind power generator, it contained wind shear and tower shadow effect. In order to simplify the equation of the speed ratio and torque, a curve fitting method based on Kalman filter was proposed. It built the virtual platform in MATLAB/Simulink, which simulates the output of current, voltage and power as the load was changed. With the effect and without the effect, the mechanical torque output was simulated respectively. The simulation results showed that the platform could simulate the operation characteristics of wind turbine generator.
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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.
