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Volume 45,Issue 2,2018 Table of Contents
2018, 45(2):1-6.
Abstract:
Considering the model complexity of elevator permanent magnet synchronous motor (PMSM), a characteristic model-based anti-disturbance adaptive control was adopted to achieve high precision control needs. A characteristic model was established by used the id=0 vector control. Based on the characteristic model, a golden-section adaptive control was applied to the speed loop. A torque observer was designed to add torque quantity into the current loop for compensation. Simulation results showed that the characteristic model-based anti-disturbance adaptive control had good steady-state accuracy and robustness. Combined with the elevator speed curve, the simulation results verified that the control algorithm applied to the elevator with PMSM control system was feasible.
Considering the model complexity of elevator permanent magnet synchronous motor (PMSM), a characteristic model-based anti-disturbance adaptive control was adopted to achieve high precision control needs. A characteristic model was established by used the id=0 vector control. Based on the characteristic model, a golden-section adaptive control was applied to the speed loop. A torque observer was designed to add torque quantity into the current loop for compensation. Simulation results showed that the characteristic model-based anti-disturbance adaptive control had good steady-state accuracy and robustness. Combined with the elevator speed curve, the simulation results verified that the control algorithm applied to the elevator with PMSM control system was feasible.
2018, 45(2):7-12, 24.
Abstract:
In order to solve the problems of midpoint voltage fluctuation, the complicated control problem of the traditional three level VIENNA rectifier, the DC-link midpoint voltage error was introduced to the dual closed-loop control and the DC-link midpoint voltage balance control was achieved by adapting vector action time. Based on the platform of MATLAB/Simulink VIENNA rectifier vector control simulation was built. The simulation results proved that the control strategy was simple and feasible, and it had good dynamic performance and static performance.
In order to solve the problems of midpoint voltage fluctuation, the complicated control problem of the traditional three level VIENNA rectifier, the DC-link midpoint voltage error was introduced to the dual closed-loop control and the DC-link midpoint voltage balance control was achieved by adapting vector action time. Based on the platform of MATLAB/Simulink VIENNA rectifier vector control simulation was built. The simulation results proved that the control strategy was simple and feasible, and it had good dynamic performance and static performance.
2018, 45(2):13-18.
Abstract:
A engineering method to suppress current harmonics in permanent magnet synchronous motor (PMSM) was presented. The 5 and 7 current harmonics were extracted through coordinate transformation and the lowpass filter, the compensation harmonic voltage was solved by the 5 and 7 harmonic steady state voltage equations, and the harmonic component of motor current was suppressed by injecting the compensation harmonic voltages into SVPWM calculation reference voltages. The experimentation results demonstrated that the proposed method was effective.
A engineering method to suppress current harmonics in permanent magnet synchronous motor (PMSM) was presented. The 5 and 7 current harmonics were extracted through coordinate transformation and the lowpass filter, the compensation harmonic voltage was solved by the 5 and 7 harmonic steady state voltage equations, and the harmonic component of motor current was suppressed by injecting the compensation harmonic voltages into SVPWM calculation reference voltages. The experimentation results demonstrated that the proposed method was effective.
2018, 45(2):19-24.
Abstract:
The model predictive direct torque control (DTC) of permanent magnet synchronous motor (PMSM) system had many problems, such as large torque ripple, constant switching frequency. A new scheme of direct torque control for PMSM based on finite control set model was proposed. The eight voltage vectors of the twolevel converter were utilized as a finite control set for the torque prediction of the PMSM. A cost function considering the torque error, the maximum torque per ampere and the current limitation was introduced. The cost function was used to estimate the duty cycle of each voltage vector. Thus the optimal voltage vector could be obtained from eight voltage vectors and their duty cycles. Compared with the traditional model predictive control, the proposed method had small harmonic current and torque ripple, and had excellent dynamic performance. Simulation results were presented to verified the performance of the proposed control scheme.
The model predictive direct torque control (DTC) of permanent magnet synchronous motor (PMSM) system had many problems, such as large torque ripple, constant switching frequency. A new scheme of direct torque control for PMSM based on finite control set model was proposed. The eight voltage vectors of the twolevel converter were utilized as a finite control set for the torque prediction of the PMSM. A cost function considering the torque error, the maximum torque per ampere and the current limitation was introduced. The cost function was used to estimate the duty cycle of each voltage vector. Thus the optimal voltage vector could be obtained from eight voltage vectors and their duty cycles. Compared with the traditional model predictive control, the proposed method had small harmonic current and torque ripple, and had excellent dynamic performance. Simulation results were presented to verified the performance of the proposed control scheme.
2018, 45(2):25-27, 33.
Abstract:
Aiming at the problems of high development threshold and the difficulty in development of permanent magnet synchronous motor (PMSM) drive, Dualcore control scheme for PMSM based on drive program solidifying——MCU of FU68XX series was provided. There was a detailed illustration of the solidifying module of the PMSM driver program——motor control core (ME) and event processing module——8051 kernel. Based on the FU6811 chip which was designed for PMSM control, this motor control experiment platform was built here. Through the experimental development, it was found that compared with the traditional development scheme, the scheme was relatively easy to learn and develop, which could reduce the development threshold. And the experimental results showed that the scheme has high control accuracy and stable performance.
Aiming at the problems of high development threshold and the difficulty in development of permanent magnet synchronous motor (PMSM) drive, Dualcore control scheme for PMSM based on drive program solidifying——MCU of FU68XX series was provided. There was a detailed illustration of the solidifying module of the PMSM driver program——motor control core (ME) and event processing module——8051 kernel. Based on the FU6811 chip which was designed for PMSM control, this motor control experiment platform was built here. Through the experimental development, it was found that compared with the traditional development scheme, the scheme was relatively easy to learn and develop, which could reduce the development threshold. And the experimental results showed that the scheme has high control accuracy and stable performance.
2018, 45(2):28-33.
Abstract:
The control strategy of built-in permanent magnet synchronous motor for electric vehicle was studied, and a control system combining super-angle weakening control and SVPWM overmodulation was proposed. The front angle weak magnetic control used the three closed-loop control of the speed, current and voltage. The motor terminal voltage and the DC side voltage form the voltage control loop, which produced the motor current field. SVPWM overmodulation algorithm could effectively improve the inverter output voltage fundamental amplitude, the motor used the field weakening control mode to achieve the maximum speed after the inverter into the modulation state, the maximum expansion of the speed range. The control system was simulated and the simulation results proved the correctness and feasibility of the theoretical analysis.
The control strategy of built-in permanent magnet synchronous motor for electric vehicle was studied, and a control system combining super-angle weakening control and SVPWM overmodulation was proposed. The front angle weak magnetic control used the three closed-loop control of the speed, current and voltage. The motor terminal voltage and the DC side voltage form the voltage control loop, which produced the motor current field. SVPWM overmodulation algorithm could effectively improve the inverter output voltage fundamental amplitude, the motor used the field weakening control mode to achieve the maximum speed after the inverter into the modulation state, the maximum expansion of the speed range. The control system was simulated and the simulation results proved the correctness and feasibility of the theoretical analysis.
2018, 45(2):34-39.
Abstract:
The theory of direct torque control (DTC) in permanent magnet synchronous motor (PMSM) was investigated. The effect of zero voltage vectors for the PMSM DTC drives was analyzed. The strategy of selecting zero voltage vector was proposed based on the minimum switching times, and a new switching table with zero voltage vectors was given. Simulation results showed that the PMSM DTC system could work properly using the new table. Switching times of the DTC system using new switching table were decreased by direct torque control nearly 56% compared to conventional switching table, therefore, switching loss was decreased.
The theory of direct torque control (DTC) in permanent magnet synchronous motor (PMSM) was investigated. The effect of zero voltage vectors for the PMSM DTC drives was analyzed. The strategy of selecting zero voltage vector was proposed based on the minimum switching times, and a new switching table with zero voltage vectors was given. Simulation results showed that the PMSM DTC system could work properly using the new table. Switching times of the DTC system using new switching table were decreased by direct torque control nearly 56% compared to conventional switching table, therefore, switching loss was decreased.
2018, 45(2):40-46.
Abstract:
The principle of suspension of bearingless permanent magnet synchronous motor (BPMSM) was analyzed. A set of damping coil was added on the rotor, and an accurate mathematical model of radial suspension force for BPMSM was established. The mathematical model was calculated, compared and analyzed. The results showed that the stability of the rotor was enhanced. By using rotor magnetic field directional control strategy, the control system of BPMSM was designed and constructed. Then the displacement of the rotor and other parameters was simulated. The simulation results showed that the stability of the motor and the robustness could be improved effectively after adding the damping coil.
The principle of suspension of bearingless permanent magnet synchronous motor (BPMSM) was analyzed. A set of damping coil was added on the rotor, and an accurate mathematical model of radial suspension force for BPMSM was established. The mathematical model was calculated, compared and analyzed. The results showed that the stability of the rotor was enhanced. By using rotor magnetic field directional control strategy, the control system of BPMSM was designed and constructed. Then the displacement of the rotor and other parameters was simulated. The simulation results showed that the stability of the motor and the robustness could be improved effectively after adding the damping coil.
2018, 45(2):47-55.
Abstract:
The permanent magnet synchronous motor driving system based on three-phase four-switch inverter had the problem of the torque ripple. Aiming at it, a torque ripple optimal control of the system was proposed. The torque ripple in the system was divided into low frequency and high frequency torque ripple. The low frequency torque ripple was generated by the voltage fluctuation of the DC capacitor, and a compensation scheme based on nonorthogonal coordinate transformation had been introduced to compensate it. For the high frequency ripple, analysis and evaluation of effects of different modulation strategies, and the optimal modulation strategy had been chosen. In addition, the linear modulation range was taken into account, and the DC capacitor voltage fluctuation of the system was considered. At the same time, an adaptive capacitor voltage offset suppression method was designed to extended linear modulation range. The experimental results showed that the new control strategy could suppress the torque ripple.
The permanent magnet synchronous motor driving system based on three-phase four-switch inverter had the problem of the torque ripple. Aiming at it, a torque ripple optimal control of the system was proposed. The torque ripple in the system was divided into low frequency and high frequency torque ripple. The low frequency torque ripple was generated by the voltage fluctuation of the DC capacitor, and a compensation scheme based on nonorthogonal coordinate transformation had been introduced to compensate it. For the high frequency ripple, analysis and evaluation of effects of different modulation strategies, and the optimal modulation strategy had been chosen. In addition, the linear modulation range was taken into account, and the DC capacitor voltage fluctuation of the system was considered. At the same time, an adaptive capacitor voltage offset suppression method was designed to extended linear modulation range. The experimental results showed that the new control strategy could suppress the torque ripple.
2018, 45(2):56-61.
Abstract:
IE4 super premium efficiency was the highest level of current global energy efficiency. The four products of YZTE4 series (IP55) threephase induction motors with diecast copper rotor, YE4 Series (IP55) threephase induction motors (H80~355), YE4 series (IP55) lowvoltage highpower threephase asynchronous motor and TYE4 series (IP55) self starting permanent magnet synchronous motor were introduced. They had reached the IE4 efficiency level.
IE4 super premium efficiency was the highest level of current global energy efficiency. The four products of YZTE4 series (IP55) threephase induction motors with diecast copper rotor, YE4 Series (IP55) threephase induction motors (H80~355), YE4 series (IP55) lowvoltage highpower threephase asynchronous motor and TYE4 series (IP55) self starting permanent magnet synchronous motor were introduced. They had reached the IE4 efficiency level.
2018, 45(2):62-65, 101.
Abstract:
The dynamics of a standing wave type linear ultrasonic motor was studied based on finite element method. The threedimensional finite element model of the motor was established, based on which the modal analysis was conducted. The resonance frequency of the first order transverse bending vibration was obtained, and the impact of the driving feet position on the resonance frequency was analyzed. On the basis of modal analysis, high frequency alternative current was then applied to the motor, and harmonic analysis was conducted. The amplitudes of transverse bending vibration stimulated by the applied source as well as the trajectories of the driving tips were investigated. A prototype of the standing wave type linear ultrasonic motor was fabricated and its impedancefrequency characteristic was measured. The measurement results verified the analytical results.
The dynamics of a standing wave type linear ultrasonic motor was studied based on finite element method. The threedimensional finite element model of the motor was established, based on which the modal analysis was conducted. The resonance frequency of the first order transverse bending vibration was obtained, and the impact of the driving feet position on the resonance frequency was analyzed. On the basis of modal analysis, high frequency alternative current was then applied to the motor, and harmonic analysis was conducted. The amplitudes of transverse bending vibration stimulated by the applied source as well as the trajectories of the driving tips were investigated. A prototype of the standing wave type linear ultrasonic motor was fabricated and its impedancefrequency characteristic was measured. The measurement results verified the analytical results.
2018, 45(2):66-70.
Abstract:
Compared with the traditional threephase motor, five phase induction motor had many advantages. In order to solve the problem that the five phase motor had a lot of voltage space vector was difficult to control, an optimized algorithm of space vector pulse width modulation (SVPWM) for the five phase induction motor was proposed. Based on the vector space decoupling theory and the theory of carrier unity, the SVPWM algorithm based on the maximum vector was used to optimize the algorithm by considering the factors such as voltage ripple and switching loss. The mathematical model of the system was established, and the simulation results were verified. The simulation results showed that the optimized algorithm meets the requirements of the motor control, compared with the traditional SVPWM algorithm and simulation, the harmonic distortion rate was reduced and the switching loss was reduced by about 20%.
Compared with the traditional threephase motor, five phase induction motor had many advantages. In order to solve the problem that the five phase motor had a lot of voltage space vector was difficult to control, an optimized algorithm of space vector pulse width modulation (SVPWM) for the five phase induction motor was proposed. Based on the vector space decoupling theory and the theory of carrier unity, the SVPWM algorithm based on the maximum vector was used to optimize the algorithm by considering the factors such as voltage ripple and switching loss. The mathematical model of the system was established, and the simulation results were verified. The simulation results showed that the optimized algorithm meets the requirements of the motor control, compared with the traditional SVPWM algorithm and simulation, the harmonic distortion rate was reduced and the switching loss was reduced by about 20%.
2018, 45(2):71-74, 127.
Abstract:
In order to meet the flexible and reliable operation of the wall climbing robot in the narrow dual magnetic wall, a permanent magnetic adhesion element based on Halbach array was designed. A twodimensional physical model be founded by Ansoft Maxwell software, analyzed by the way of finite element analysis, obtained the distribution of magnetic field and magnetic induction intensity, and analyze the effect of structure par ameters on adsorption properties. By comparing with the traditional permanent magnetic adhesion element of magnetic field, the new permanent magnetic adhesion element with the highly permanent magnet utilization rate and unilateral magnetic field, it could be flexible and reliable walking in generator stator gap. The influence of structural parameters on the adsorption performance was analyzed by using the method of parameter variation. It provided reference data for the design of permanent magnetic adhesion element.
In order to meet the flexible and reliable operation of the wall climbing robot in the narrow dual magnetic wall, a permanent magnetic adhesion element based on Halbach array was designed. A twodimensional physical model be founded by Ansoft Maxwell software, analyzed by the way of finite element analysis, obtained the distribution of magnetic field and magnetic induction intensity, and analyze the effect of structure par ameters on adsorption properties. By comparing with the traditional permanent magnetic adhesion element of magnetic field, the new permanent magnetic adhesion element with the highly permanent magnet utilization rate and unilateral magnetic field, it could be flexible and reliable walking in generator stator gap. The influence of structural parameters on the adsorption performance was analyzed by using the method of parameter variation. It provided reference data for the design of permanent magnetic adhesion element.
14 Magnetic Field Modeling and Analysis of U-Shaped Ironless PermanentMagnet Synchronous Linear Motor
2018, 45(2):75-80.
Abstract:
Due to the influence of the core breaking, the traditional iron core linear motor had the end-effect of lateral and vertical side, which made the output of the thrust line fluctuate greatly. The ironless permanent magnet synchronous linear motor has the advantages of zero slot effect, simple structure and flexible control. Based on the analysis of air gap magnetic field ironless permanent magnet synchronous linear motor problems by using two kinds of analytical method, namely equivalent magnetic potential method and the equivalent magnetizing current method, and the finite element analysis of the magnetic field using the finite element method. The analytical method for magnetic field analysis was verified to be accurate. By changing the motor parameters, the optimization design was achieved, which provided the reference for the design and analysis of same kind of motors.
Due to the influence of the core breaking, the traditional iron core linear motor had the end-effect of lateral and vertical side, which made the output of the thrust line fluctuate greatly. The ironless permanent magnet synchronous linear motor has the advantages of zero slot effect, simple structure and flexible control. Based on the analysis of air gap magnetic field ironless permanent magnet synchronous linear motor problems by using two kinds of analytical method, namely equivalent magnetic potential method and the equivalent magnetizing current method, and the finite element analysis of the magnetic field using the finite element method. The analytical method for magnetic field analysis was verified to be accurate. By changing the motor parameters, the optimization design was achieved, which provided the reference for the design and analysis of same kind of motors.
2018, 45(2):81-85.
Abstract:
In order to improved the efficiency of induction motor (IM), on the basis of considering the iron loss mathematical model, voltage and current constraints at high and low speed conditions were given. The given of the optimal rotor flux linkage to ensure the smallest loss was transformed into the minimization of the objective function under constraint conditions. The generalized Lagrange function was defined, and the Kuhn-Tucker theorem was used to solve the optimal rotor flux linkage under constant torque region and constant power region, then IM efficiency was maximized in the entire working range. Simulation results verified the effectiveness of the proposed method.
In order to improved the efficiency of induction motor (IM), on the basis of considering the iron loss mathematical model, voltage and current constraints at high and low speed conditions were given. The given of the optimal rotor flux linkage to ensure the smallest loss was transformed into the minimization of the objective function under constraint conditions. The generalized Lagrange function was defined, and the Kuhn-Tucker theorem was used to solve the optimal rotor flux linkage under constant torque region and constant power region, then IM efficiency was maximized in the entire working range. Simulation results verified the effectiveness of the proposed method.
2018, 45(2):86-89, 96.
Abstract:
A new method of reference voltage vector acquisition that did not rely on motor’s parameter was proposed for the problem which the change of motor’s parameter could made the accuracy of reference voltage vector acquisition unreliable in the PMSM’s SVM-DTC method. The PI controllers were used for the error of torque and amplitude of stator linkage, and their output was separately allotted a weight. The weighted sum of their absolute value was used for the control of amplitude of reference voltage vector, and their ratio would be the gist that could compute the angle between reference voltage vector and stator linkage vector. The result of simulation showed that the performance of this method was favourable and the influence making by the change of motor’ parameters could be well overcame. The simulation verifies that the method was effective.
A new method of reference voltage vector acquisition that did not rely on motor’s parameter was proposed for the problem which the change of motor’s parameter could made the accuracy of reference voltage vector acquisition unreliable in the PMSM’s SVM-DTC method. The PI controllers were used for the error of torque and amplitude of stator linkage, and their output was separately allotted a weight. The weighted sum of their absolute value was used for the control of amplitude of reference voltage vector, and their ratio would be the gist that could compute the angle between reference voltage vector and stator linkage vector. The result of simulation showed that the performance of this method was favourable and the influence making by the change of motor’ parameters could be well overcame. The simulation verifies that the method was effective.
2018, 45(2):90-96.
Abstract:
In order to check the cooling effect of the motor by using the spiral water jacket, a three-dimensional temperature field of the motor was studied by finite element method for a ultra-high speed PM motor with a rated 10 kW, 90 000 r/min considered stator iron loss, stator copper loss, rotor iron loss and rotor wind friction loss. The results showed that the air in the stator-rotor narrow gap seems to impose a heat sealed on the rotor. Therefore, it would not very effectively to cool the rotor with a significant loss power by the spiral water jacket only. Some additional cooling method, such as forced air cooling, should be applied in order to reduce the rotor temperature further. The results provideed an important reference for the thermal design of high power high speed PM motor.
In order to check the cooling effect of the motor by using the spiral water jacket, a three-dimensional temperature field of the motor was studied by finite element method for a ultra-high speed PM motor with a rated 10 kW, 90 000 r/min considered stator iron loss, stator copper loss, rotor iron loss and rotor wind friction loss. The results showed that the air in the stator-rotor narrow gap seems to impose a heat sealed on the rotor. Therefore, it would not very effectively to cool the rotor with a significant loss power by the spiral water jacket only. Some additional cooling method, such as forced air cooling, should be applied in order to reduce the rotor temperature further. The results provideed an important reference for the thermal design of high power high speed PM motor.
2018, 45(2):97-101.
Abstract:
Based on Ansys, MATLAB/Simulink simulation software, the working characteristics of a permanent magnet synchronous torque motor on formulti-physical field were analyzed. The motor electromagnetic simulation and modal to suppress the torque ripple and vibration; Simulate the centrifugal stress and rotor structure deformation of rotor in highest no load speed was analyzed. Check the technical index requirements of the reliability of the highest speed running point; United design the torque characteristics of motor control system based on Ansys Simplorer platform. Analyze the influences of the processing technology in motor performance, and sought the optimal design scheme of motor from the aspects of overall system.
Based on Ansys, MATLAB/Simulink simulation software, the working characteristics of a permanent magnet synchronous torque motor on formulti-physical field were analyzed. The motor electromagnetic simulation and modal to suppress the torque ripple and vibration; Simulate the centrifugal stress and rotor structure deformation of rotor in highest no load speed was analyzed. Check the technical index requirements of the reliability of the highest speed running point; United design the torque characteristics of motor control system based on Ansys Simplorer platform. Analyze the influences of the processing technology in motor performance, and sought the optimal design scheme of motor from the aspects of overall system.
2018, 45(2):102-105.
Abstract:
The measurement of partial discharge (PD) under high frequency impulse voltage may be effective to check the insulation condition of the motor insulation system. Depending on the sensor, there were two methods of detecting PD under high frequency voltage for the motor insulation system: Highfrequency Current Transducer and ultrahigh frequency antenna. The PD activities mainly occur in both pulse rising edge and falling edge under the impulse voltage. The amplitudes of PD in both rising edge and falling edge were higher under the same applied voltage. In the qualification test of stator insulation system of wind turbines, the PD inception voltages of the coil were decreasing with the aging test. the impulse voltage insulation class and type of stator insulation system are determined by the qualification test.
The measurement of partial discharge (PD) under high frequency impulse voltage may be effective to check the insulation condition of the motor insulation system. Depending on the sensor, there were two methods of detecting PD under high frequency voltage for the motor insulation system: Highfrequency Current Transducer and ultrahigh frequency antenna. The PD activities mainly occur in both pulse rising edge and falling edge under the impulse voltage. The amplitudes of PD in both rising edge and falling edge were higher under the same applied voltage. In the qualification test of stator insulation system of wind turbines, the PD inception voltages of the coil were decreasing with the aging test. the impulse voltage insulation class and type of stator insulation system are determined by the qualification test.
2018, 45(2):106-111.
Abstract:
A new type of unit power factor rectification based on single cycle control One-Cycle Control (OCC) was proposed. The circuit was powered by a downhole electric locomotive. The power supply was composed of a rectifier stage based on cascaded vienna rectifier and a transmission stage based on high-frequency isolated DC-DC converter. However, an overall control scheme was adopted to regulate the two stages. This simple control scheme could realize the unity power factor without involving any multipliers or input voltage sensors. Besides, the voltage pressure of the switches could be reduced by half due to the topology structure. The basic operating principles and the double-loop control strategy were analyzed in detail. The correctness of the proposed circuit and its corresponding control strategy was verified by simulation and experiment.
A new type of unit power factor rectification based on single cycle control One-Cycle Control (OCC) was proposed. The circuit was powered by a downhole electric locomotive. The power supply was composed of a rectifier stage based on cascaded vienna rectifier and a transmission stage based on high-frequency isolated DC-DC converter. However, an overall control scheme was adopted to regulate the two stages. This simple control scheme could realize the unity power factor without involving any multipliers or input voltage sensors. Besides, the voltage pressure of the switches could be reduced by half due to the topology structure. The basic operating principles and the double-loop control strategy were analyzed in detail. The correctness of the proposed circuit and its corresponding control strategy was verified by simulation and experiment.
LI Xiaocong
,
JI Xiaocheng
,
PENG Cheng
,
XU Junhua
,
GONG Biao
,
ZHAO Nengneng
,
DUAN Xu
,
ZHANG Huanbo
,
YUAN Ruizhi
2018, 45(2):112-117, 133.
Abstract:
This paper analyzed different faults of three phase full controlled bridge rectifier circuit, gets the quantitative relationship between trigger angle and output excitation voltage, proposes relevant measure, and then simulates the model of excitation power unit by using MATLAB/Simulink platform. The results showed that the proposed method can effectively reduce the adverse effects of the fault on the system and obtain time for switching standby devices when pulses disappear or make for controlling generators existing smoothly to avoid stability problems when thyristors break down.
This paper analyzed different faults of three phase full controlled bridge rectifier circuit, gets the quantitative relationship between trigger angle and output excitation voltage, proposes relevant measure, and then simulates the model of excitation power unit by using MATLAB/Simulink platform. The results showed that the proposed method can effectively reduce the adverse effects of the fault on the system and obtain time for switching standby devices when pulses disappear or make for controlling generators existing smoothly to avoid stability problems when thyristors break down.
22 Maximum Energy Tracking of Wind Turbine Based on ElectromagneticCoupler Using Backstepping Control
2018, 45(2):118-127.
Abstract:
In term of operating characteristics of the wind turbine based on electromagnetic coupler, torque backstepping slide-model variable structure control and speed backstepping control were respectively applied in maximum power tracking area and constant speed area. A simulation model of a wind turbine based on an electromagnetic coupler in maximum power point tracking was built. The proposed control method had a simple structure and avoids measuring real-time wind speed. The simulation results , which were accomplished in step wind and random wind condition, indicate that this power tracking control scheme had good dynamic and static performance and better robust performance. Compared with torque backstepping and classical OTC, the proposed method could quickly and accurately track the variation of wind and effectively accomplish the goal of maximum power tracking.
In term of operating characteristics of the wind turbine based on electromagnetic coupler, torque backstepping slide-model variable structure control and speed backstepping control were respectively applied in maximum power tracking area and constant speed area. A simulation model of a wind turbine based on an electromagnetic coupler in maximum power point tracking was built. The proposed control method had a simple structure and avoids measuring real-time wind speed. The simulation results , which were accomplished in step wind and random wind condition, indicate that this power tracking control scheme had good dynamic and static performance and better robust performance. Compared with torque backstepping and classical OTC, the proposed method could quickly and accurately track the variation of wind and effectively accomplish the goal of maximum power tracking.
2018, 45(2):128-133.
Abstract:
In order to solve the problem that the traditional PID could not achieve good control effects in the wind turbine with large inertia and strong coupling, a wind speed feed-forward and variable region fuzzy pitch controller was proposed. According to the power error and its rate of change, the contraction-expansion factor was obtained by fuzzy inference. And this method avoid the difficulty of determining the contraction-expansion factor model and its parameters. The dynamic compensation of pitch angle was realized by using the method of wind speed feed-forward, and the response speed of the system had also been improved. The simulation results showed that when the wind speed exceeds the rated wind speed, this method could made the speed and the output power more stable.
In order to solve the problem that the traditional PID could not achieve good control effects in the wind turbine with large inertia and strong coupling, a wind speed feed-forward and variable region fuzzy pitch controller was proposed. According to the power error and its rate of change, the contraction-expansion factor was obtained by fuzzy inference. And this method avoid the difficulty of determining the contraction-expansion factor model and its parameters. The dynamic compensation of pitch angle was realized by using the method of wind speed feed-forward, and the response speed of the system had also been improved. The simulation results showed that when the wind speed exceeds the rated wind speed, this method could made the speed and the output power more stable.
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
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Electric Machines & Control Application ® 2025
Supported by:Beijing E-Tiller Technology Development Co., Ltd.
