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Volume 45,Issue 11,2018 Table of Contents
2018, 45(11):1-6.
Abstract:
The bearingless brushless DC motor (BBLDCM) was a strongcoupled nonlinear system. To solve the problems of suspension system precise control and rotor jitter, a novel direct suspension force control strategy was proposed. With the reference of direct torque control of traditional brushless DC motor and the operating characteristics of the BBLDCM, the suspension force vector under different conditions was derived, the suspension winding conduction table was given, and the working process of the novel direct suspension force was clarified. Finally, the suspension control system was designed and simulated by Simulink. The simulation results showed that the rotor could be suspended stably, and the rotor jitter was weakened effectively. In addition, this method improved the control accuracy of the suspension system.
The bearingless brushless DC motor (BBLDCM) was a strongcoupled nonlinear system. To solve the problems of suspension system precise control and rotor jitter, a novel direct suspension force control strategy was proposed. With the reference of direct torque control of traditional brushless DC motor and the operating characteristics of the BBLDCM, the suspension force vector under different conditions was derived, the suspension winding conduction table was given, and the working process of the novel direct suspension force was clarified. Finally, the suspension control system was designed and simulated by Simulink. The simulation results showed that the rotor could be suspended stably, and the rotor jitter was weakened effectively. In addition, this method improved the control accuracy of the suspension system.
2018, 45(11):7-14, 20.
Abstract:
A doublestator bearingless switched reluctance motor was studied. An innerouter double stator structure were adopted for the motor. The suspension force winding and the torque winding were separately arranged on the inner stator and the outer stator. Based on the description of the operating principle of the topology, the direct torque and direct suspension force control (DT/DSFC) strategy was proposed for the problem that the motor had both torque ripple and suspension force pulsation. The torque ripple, suspension force pulsation and rotor radial displacement fluctuation of the system under the traditional square wave control strategy and the proposed control strategy were compared. The test results showed that DT/DSFC could not only improve the dynamic response speed of the system, but also effectively suppress the torque and suspension force pulsation, and weaken the rotor radial buffeting, verifying the effectiveness and superiority of the proposed control strategy.
A doublestator bearingless switched reluctance motor was studied. An innerouter double stator structure were adopted for the motor. The suspension force winding and the torque winding were separately arranged on the inner stator and the outer stator. Based on the description of the operating principle of the topology, the direct torque and direct suspension force control (DT/DSFC) strategy was proposed for the problem that the motor had both torque ripple and suspension force pulsation. The torque ripple, suspension force pulsation and rotor radial displacement fluctuation of the system under the traditional square wave control strategy and the proposed control strategy were compared. The test results showed that DT/DSFC could not only improve the dynamic response speed of the system, but also effectively suppress the torque and suspension force pulsation, and weaken the rotor radial buffeting, verifying the effectiveness and superiority of the proposed control strategy.
2018, 45(11):15-20.
Abstract:
An efficiencyoptimizing control method for direct torque controlled interior permanent magnet synchronous motor (IPMSM) was proposed. Based on the model of IPMSM taking into account iron losses, the dependences of power losses on the output torque, speed and stator flux were analyzed in detail. According to the characteristics of the classical direct torque control which did not use the zero voltage space vectors, the expression of the power losses could be simplified. The stator flux linkages which achieved the maximum efficiency were obtained in the different operating conditions. The simulation results showed that the proposed control method not only preserved the fast torque dynamic response of the direct torque controlled driving system, but also improved the efficiency of the motor in steady state operation.
An efficiencyoptimizing control method for direct torque controlled interior permanent magnet synchronous motor (IPMSM) was proposed. Based on the model of IPMSM taking into account iron losses, the dependences of power losses on the output torque, speed and stator flux were analyzed in detail. According to the characteristics of the classical direct torque control which did not use the zero voltage space vectors, the expression of the power losses could be simplified. The stator flux linkages which achieved the maximum efficiency were obtained in the different operating conditions. The simulation results showed that the proposed control method not only preserved the fast torque dynamic response of the direct torque controlled driving system, but also improved the efficiency of the motor in steady state operation.
2018, 45(11):21-27.
Abstract:
In order to reduce the influence of inverter switching frequency on the output performance of permanent magnet synchronous motor (PMSM), a model predictive torque control (MPTC) method considering the switching frequency optimization for PMSM was proposed. According to the mathematical model of the electromagnetic torque and stator flux, a cost function based on the MPTC was designed. In order to implement the low switching frequency in the full speed range, a switching frequency restriction was also constructed. The control algorithm was developed in both the constanttorque operation and constantpower operation conditions, when the maximum torque per ampere and flux weakening control methods were employed, respectively. Simulation results were presented, verifying the effectiveness of the proposed control strategy.
In order to reduce the influence of inverter switching frequency on the output performance of permanent magnet synchronous motor (PMSM), a model predictive torque control (MPTC) method considering the switching frequency optimization for PMSM was proposed. According to the mathematical model of the electromagnetic torque and stator flux, a cost function based on the MPTC was designed. In order to implement the low switching frequency in the full speed range, a switching frequency restriction was also constructed. The control algorithm was developed in both the constanttorque operation and constantpower operation conditions, when the maximum torque per ampere and flux weakening control methods were employed, respectively. Simulation results were presented, verifying the effectiveness of the proposed control strategy.
2018, 45(11):28-33, 65.
Abstract:
Permanent magnet synchronous motor had many problems in vector control, such as frequent overshoot of speed and current, low steadystate accuracy and weak robustness. Three nonsingular fast terminal sliding mode controllers were adopted to replace the speed loop controller and current loop controllers used in traditional PI control, and the stability of the three controllers was proved by using Lyapunov function. The response waveforms of speed and current of using nonsingular fast terminal sliding mode controller and PI controller were analyzed by MATLAB/Simulink simulation software. The simulation results showed that the nonsingular fast terminal sliding mode controller had less overshoot, higher steadystate accuracy and stronger robustness.
Permanent magnet synchronous motor had many problems in vector control, such as frequent overshoot of speed and current, low steadystate accuracy and weak robustness. Three nonsingular fast terminal sliding mode controllers were adopted to replace the speed loop controller and current loop controllers used in traditional PI control, and the stability of the three controllers was proved by using Lyapunov function. The response waveforms of speed and current of using nonsingular fast terminal sliding mode controller and PI controller were analyzed by MATLAB/Simulink simulation software. The simulation results showed that the nonsingular fast terminal sliding mode controller had less overshoot, higher steadystate accuracy and stronger robustness.
2018, 45(11):34-38, 55.
Abstract:
The response specd of current loop of permanent magnet synchronous motor (PMSM) servo system determines the servo system response speed. The deadbeat current control allowed PMSM current control loop to have a good response speed. However, when the actual motor parameters did not match the motor parameters in the control algorithm, current steady error would be produced, and the desired torque could not be output. The discretetime integral was added to the deadbeat current control algorithm and the range of integral coefficients was given, which eliminated the current steady error caused by the change of motor parameters and the accuracy of current tracking was improved. Finally, the validity and practicability of the proposed algorithm were verified by experiments.
The response specd of current loop of permanent magnet synchronous motor (PMSM) servo system determines the servo system response speed. The deadbeat current control allowed PMSM current control loop to have a good response speed. However, when the actual motor parameters did not match the motor parameters in the control algorithm, current steady error would be produced, and the desired torque could not be output. The discretetime integral was added to the deadbeat current control algorithm and the range of integral coefficients was given, which eliminated the current steady error caused by the change of motor parameters and the accuracy of current tracking was improved. Finally, the validity and practicability of the proposed algorithm were verified by experiments.
2018, 45(11):39-44, 82.
Abstract:
A new large power and high torque outer rotor inwheel motor was presented, which was used for electric airport shuttle bus, airport bus, bus, etc. By optimizing the pole arc coefficient and pole skew of the permanent magnet, the phase back electromotive force (EMF) was trapezoidal wave that contained mainly 3rd harmonics, line back EMF was sinusoidal wave, and the output torque of the motor was improved. The effects of permanent magnet with different coercivity on the electromotive force were compared and analyzed. Considering the torque output and adjustment range of motor speed, reasonable coercivity was applied. Besides, the fieldcircuit coupling simulation platform was built based on SimplorerMaxwell software, and drive characteristics of motor controlled by field oriented vector control and square wave control were compared. Although both control strategies were applicable for this type of motor, the field oriented vector control showed better performance with less torque ripple.
A new large power and high torque outer rotor inwheel motor was presented, which was used for electric airport shuttle bus, airport bus, bus, etc. By optimizing the pole arc coefficient and pole skew of the permanent magnet, the phase back electromotive force (EMF) was trapezoidal wave that contained mainly 3rd harmonics, line back EMF was sinusoidal wave, and the output torque of the motor was improved. The effects of permanent magnet with different coercivity on the electromotive force were compared and analyzed. Considering the torque output and adjustment range of motor speed, reasonable coercivity was applied. Besides, the fieldcircuit coupling simulation platform was built based on SimplorerMaxwell software, and drive characteristics of motor controlled by field oriented vector control and square wave control were compared. Although both control strategies were applicable for this type of motor, the field oriented vector control showed better performance with less torque ripple.
2018, 45(11):45-49, 125.
Abstract:
Brushless doublyfed motor (BDFM) had promising application prospect in wind power generation. Coupling capability of rotor was an important factor affecting the power density and efficiency of the motor. Based on the analysis of structures of cage rotor, a segmented squirrelcage rotor was presented. At first, the topology of the BDFM and the principle of variablespeed constantfrequency (VSCF) generation were introduced. Secondly, analysis of BDFM with the above rotor structures was carried out using finite element software. Finally, the key parameters affecting the coupling capability were analyzed, such as spacing angle of rotor bars and layer number of rotor bars. The results showed that the new rotor structure held higher end space utilization ratio, higher motor power density and simple and reliable rotor structure under certain coupling capability.
Brushless doublyfed motor (BDFM) had promising application prospect in wind power generation. Coupling capability of rotor was an important factor affecting the power density and efficiency of the motor. Based on the analysis of structures of cage rotor, a segmented squirrelcage rotor was presented. At first, the topology of the BDFM and the principle of variablespeed constantfrequency (VSCF) generation were introduced. Secondly, analysis of BDFM with the above rotor structures was carried out using finite element software. Finally, the key parameters affecting the coupling capability were analyzed, such as spacing angle of rotor bars and layer number of rotor bars. The results showed that the new rotor structure held higher end space utilization ratio, higher motor power density and simple and reliable rotor structure under certain coupling capability.
2018, 45(11):50-55.
Abstract:
In order to optimize the performance of sensorless control system of permanent magnet synchronous motor (PMSM) based on sliding mode observer (SMO),the mathematical model and control algorithm of the corresponding module in the traditional control system were analyzed, and the optimal SMO based sensorless control model of PMSM was established and simulated. By analyzing the traditional SMO, the sliding mode gain was optimized in real time according to the different operating conditions of the motor on the premise that the SMO satisfied the Lyapunov stability condition.The performance of SMO was improved. In order to improve the quality of the output signal of the phase locked loop (PLL), a low pass filter was added at the input of the PLL, and the position deviation caused by low pass filter was compensated. The correctness and feasibility of the above optimization strategy was verified by simulation. The results showed that the optimized model could obtain better observation signal than the traditional observation system under the condition of ensuring the dynamic performance of the system.
In order to optimize the performance of sensorless control system of permanent magnet synchronous motor (PMSM) based on sliding mode observer (SMO),the mathematical model and control algorithm of the corresponding module in the traditional control system were analyzed, and the optimal SMO based sensorless control model of PMSM was established and simulated. By analyzing the traditional SMO, the sliding mode gain was optimized in real time according to the different operating conditions of the motor on the premise that the SMO satisfied the Lyapunov stability condition.The performance of SMO was improved. In order to improve the quality of the output signal of the phase locked loop (PLL), a low pass filter was added at the input of the PLL, and the position deviation caused by low pass filter was compensated. The correctness and feasibility of the above optimization strategy was verified by simulation. The results showed that the optimized model could obtain better observation signal than the traditional observation system under the condition of ensuring the dynamic performance of the system.
2018, 45(11):56-60.
Abstract:
The difference between the actual value and the estimated value of the system variable was large in the initial stages of observation using linear extended state observer (LESO). Since the gain of LESO was large, there was obvious peaking phenomenon, which affected the measurement of the disturbance. The larger the gain of the observer, the more severe of the peaking phenomenon. In order to solve the problems, a timevarying gain extended state observer (TESO) was designed. Its gain was a time varying function, which was a smaller value at the initial time, and then the function value increased with time to a larger constant. The parameters tuning formula was given based on Lyapunov transform and differential algebraic spectral theory. Replacing the extended state observer in the linear active disturbance rejection controller (LADRC) with TESO, the controller was applied to the speed control of permanent magnet synchronous motor regulation system. The effectiveness of the controller design was verified by the simulation and experimental results.
The difference between the actual value and the estimated value of the system variable was large in the initial stages of observation using linear extended state observer (LESO). Since the gain of LESO was large, there was obvious peaking phenomenon, which affected the measurement of the disturbance. The larger the gain of the observer, the more severe of the peaking phenomenon. In order to solve the problems, a timevarying gain extended state observer (TESO) was designed. Its gain was a time varying function, which was a smaller value at the initial time, and then the function value increased with time to a larger constant. The parameters tuning formula was given based on Lyapunov transform and differential algebraic spectral theory. Replacing the extended state observer in the linear active disturbance rejection controller (LADRC) with TESO, the controller was applied to the speed control of permanent magnet synchronous motor regulation system. The effectiveness of the controller design was verified by the simulation and experimental results.
2018, 45(11):61-65.
Abstract:
Permanent magnet synchronous motors have many problems such as high consumables and high cost. So synchronous reluctance motor with low cost and high efficiency was developed to replace permanent magnet synchronous motors under certain conditions, and to promote the use of highefficiency motors. The key technologies of the 2.2 kW, 4pole synchronous reluctance motor such as its structure, electromagnetic parameters, and control methods were studied. A theoretical basis was provided for the serialized design of the product. It has a certain reference for motor designers.
Permanent magnet synchronous motors have many problems such as high consumables and high cost. So synchronous reluctance motor with low cost and high efficiency was developed to replace permanent magnet synchronous motors under certain conditions, and to promote the use of highefficiency motors. The key technologies of the 2.2 kW, 4pole synchronous reluctance motor such as its structure, electromagnetic parameters, and control methods were studied. A theoretical basis was provided for the serialized design of the product. It has a certain reference for motor designers.
2018, 45(11):66-71.
Abstract:
Replacing the silicon steel rotor core of original motor by the amorphous alloy rotor core, effects of amorphous alloy rotor core on the performance of motor was analyzed based on finite element software Ansoft. Compared with the original motor, the load torque of the remanufacturing motor was enhanced by 2.6%, the efficiency was 0.05% higher, and the cogging torque was highly improved. In order to reduce the cogging torque, stator with skewed slots was adopted. When the skewed slot number was 1, the cogging torque of the motor was 0.128 N·m, which was reduced by 92.36% compared with the remanufacturing motor and was 38.46% lower than the original motor.
Replacing the silicon steel rotor core of original motor by the amorphous alloy rotor core, effects of amorphous alloy rotor core on the performance of motor was analyzed based on finite element software Ansoft. Compared with the original motor, the load torque of the remanufacturing motor was enhanced by 2.6%, the efficiency was 0.05% higher, and the cogging torque was highly improved. In order to reduce the cogging torque, stator with skewed slots was adopted. When the skewed slot number was 1, the cogging torque of the motor was 0.128 N·m, which was reduced by 92.36% compared with the remanufacturing motor and was 38.46% lower than the original motor.
2018, 45(11):72-77.
Abstract:
Aiming at the problem of rotor flux orientation inaccuracy in induction motor’s vector control process, the reason of flux linkage observation error was analyzed, and the online identification method of motor parameters was emphatically studied. A method based on model reference adaptive system for flux observation and parameter identification was proposed. The twoparameter adaptive law of rotor time constant and excitation mutual inductance was designed based on Popov hyperstability theorem. This method took the voltage model as the reference model, and identified the parameters required by the current model on line. It made the flux observation result convergent and robust, avoiding bad effects of the motor parameter measurement inaccuracy and the easy change. The simulation results proved that the method was accurate and realtime.
Aiming at the problem of rotor flux orientation inaccuracy in induction motor’s vector control process, the reason of flux linkage observation error was analyzed, and the online identification method of motor parameters was emphatically studied. A method based on model reference adaptive system for flux observation and parameter identification was proposed. The twoparameter adaptive law of rotor time constant and excitation mutual inductance was designed based on Popov hyperstability theorem. This method took the voltage model as the reference model, and identified the parameters required by the current model on line. It made the flux observation result convergent and robust, avoiding bad effects of the motor parameter measurement inaccuracy and the easy change. The simulation results proved that the method was accurate and realtime.
2018, 45(11):78-82.
Abstract:
In order to analyze the influence of rotor slot opening depth and slot combination on the rotor loss of threephase variable frequency asynchronous motor, ANSYS Maxwell was used to analyze the rotor loss of a 10pole 1 100 kW threephase variable frequency speedvariable induction motor with abnormal noload loss. Motor models with different rotor slot opening depths and slot combinations were built. In combination with the theory of harmonic magnetic field in the motor, the losses of rotor cores and rotor bars of the motor models with different rotor slot opening depths and slot combinations were compared and analyzed. According to the results of simulation analysis, the prototype was improved. The results of the prototype test proved the correctness of the simulation calculation, which could provide reference for the design of the relevant motor.
In order to analyze the influence of rotor slot opening depth and slot combination on the rotor loss of threephase variable frequency asynchronous motor, ANSYS Maxwell was used to analyze the rotor loss of a 10pole 1 100 kW threephase variable frequency speedvariable induction motor with abnormal noload loss. Motor models with different rotor slot opening depths and slot combinations were built. In combination with the theory of harmonic magnetic field in the motor, the losses of rotor cores and rotor bars of the motor models with different rotor slot opening depths and slot combinations were compared and analyzed. According to the results of simulation analysis, the prototype was improved. The results of the prototype test proved the correctness of the simulation calculation, which could provide reference for the design of the relevant motor.
2018, 45(11):83-87.
Abstract:
By comparing and analyzing the characteristics of typical fans of Y, Y2 and YX3 series, the influence of fan parameters on the fan characteristics was studied. On this basis, a special fan model for YE4 series super premium efficiency threephase asynchronous motor was designed, and a comparative experiment was carried out on the 5 specifications prototypes of YE4132S22 and so on. Expected results were obtained in the experiment.
By comparing and analyzing the characteristics of typical fans of Y, Y2 and YX3 series, the influence of fan parameters on the fan characteristics was studied. On this basis, a special fan model for YE4 series super premium efficiency threephase asynchronous motor was designed, and a comparative experiment was carried out on the 5 specifications prototypes of YE4132S22 and so on. Expected results were obtained in the experiment.
2018, 45(11):88-93.
Abstract:
According to the principle of the device and the magnetic field of the drive coil, the motion model of emitter was deduced based on the linear inductance model. A simplified calculation method for the force and the acceleration of emitter in the coil was given and some influence factors were concluded. The force to the different shapes of emitter in the coil was simulated by ANSYS Maxwell. All of these provided the guide for the further design and optimization of emitter used in reluctance launch system.
According to the principle of the device and the magnetic field of the drive coil, the motion model of emitter was deduced based on the linear inductance model. A simplified calculation method for the force and the acceleration of emitter in the coil was given and some influence factors were concluded. The force to the different shapes of emitter in the coil was simulated by ANSYS Maxwell. All of these provided the guide for the further design and optimization of emitter used in reluctance launch system.
2018, 45(11):94-103.
Abstract:
With the increase of doublyfed induction generator (DFIG) wind capacity connected to power grid, the stability of power grid was much related to the parameters of wind converter controllers, and wind turbine converter parameter setting must consider smallsignal stability of grid. The smallsignal model of wind turbine and infinite power grid under all possible wind speeds was established. The smallsignal stable mathematical state equations were established respectively in maximum power tracking zone, constant speed zone and constant power zone by Lyapunov linearization method. Index of stability margin was introduced to evaluate the smallsignal stability of grid, and the parameters setting method was proposed with considering the relevance between wind turbine controller parameters and eigenvalues which could maintain the smallsignal stability of grid under different wind speeds. Simulation results showed that suitable parameters of wind converter could be obtained by the proposed method to maintain the stability of power grid under all of the possible wind speeds.
With the increase of doublyfed induction generator (DFIG) wind capacity connected to power grid, the stability of power grid was much related to the parameters of wind converter controllers, and wind turbine converter parameter setting must consider smallsignal stability of grid. The smallsignal model of wind turbine and infinite power grid under all possible wind speeds was established. The smallsignal stable mathematical state equations were established respectively in maximum power tracking zone, constant speed zone and constant power zone by Lyapunov linearization method. Index of stability margin was introduced to evaluate the smallsignal stability of grid, and the parameters setting method was proposed with considering the relevance between wind turbine controller parameters and eigenvalues which could maintain the smallsignal stability of grid under different wind speeds. Simulation results showed that suitable parameters of wind converter could be obtained by the proposed method to maintain the stability of power grid under all of the possible wind speeds.
2018, 45(11):104-109, 120.
Abstract:
Aiming at offshore wind energy development and utilization, a novel permanent magnet wind power generator was proposed and designed. The proposed electric machine consisted of multiple modular stator permanent magnet generators (MSPMGs) with uniform spatial phase shifting and each MSPMG was singlephase doubly salient electric machine with modular stator containing permanent magnet and toothed winding structures, which significantly reduced the magnetic coupling and mutual inductance between modules. By analyzing the electromagnetic torque and power characteristics of MSPMG, the optimal power control strategy of MSPMG was deduced based on variational principle and the optimal armature current control was realized by using singlephase Hbridge controllable rectifier. The results of finite element analysis indicated that the coupling coefficient between different modules of the MSPMG was very small due to the isolated magnetic circuits, so the proposed machine had strong operating capability of fault tolerance. Simulation results verified the correctness and effectiveness of the designed electric machine and the corresponding control strategy.
Aiming at offshore wind energy development and utilization, a novel permanent magnet wind power generator was proposed and designed. The proposed electric machine consisted of multiple modular stator permanent magnet generators (MSPMGs) with uniform spatial phase shifting and each MSPMG was singlephase doubly salient electric machine with modular stator containing permanent magnet and toothed winding structures, which significantly reduced the magnetic coupling and mutual inductance between modules. By analyzing the electromagnetic torque and power characteristics of MSPMG, the optimal power control strategy of MSPMG was deduced based on variational principle and the optimal armature current control was realized by using singlephase Hbridge controllable rectifier. The results of finite element analysis indicated that the coupling coefficient between different modules of the MSPMG was very small due to the isolated magnetic circuits, so the proposed machine had strong operating capability of fault tolerance. Simulation results verified the correctness and effectiveness of the designed electric machine and the corresponding control strategy.
2018, 45(11):110-115.
Abstract:
Aiming at fault diagnosis of wind turbine pitch system affected by state delay, a new fault diagnosis method based on multiinnovation stochastic gradient algorithm was proposed. This complex system was modeled as a state space model, and the system identification model was established. The algorithm extended the innovation scalar into innovation vector to improve the accuracy. The changes of parameters could be caused by the fault of the system, and the algorithm was used to estimate the parameters of wind turbine pitch system with state delay. The fault diagnosis issue was transformed into identification problem. Simulation results showed that this method could achieve the purpose of diagnosing the fault of wind turbine pitch system with state delay.
Aiming at fault diagnosis of wind turbine pitch system affected by state delay, a new fault diagnosis method based on multiinnovation stochastic gradient algorithm was proposed. This complex system was modeled as a state space model, and the system identification model was established. The algorithm extended the innovation scalar into innovation vector to improve the accuracy. The changes of parameters could be caused by the fault of the system, and the algorithm was used to estimate the parameters of wind turbine pitch system with state delay. The fault diagnosis issue was transformed into identification problem. Simulation results showed that this method could achieve the purpose of diagnosing the fault of wind turbine pitch system with state delay.
2018, 45(11):116-120.
Abstract:
In order to overcome some shortcomings of the traditional maximum power point tracking (MPPT) method and make the photo voltaic (PV) system work more quickly and accurately at the maximum power output point, an adaptive control method based on fuzzy control and neural network control was proposed. This method made full use of the advantages of fuzzy neural network to deal with nonlinear problems. The fuzzy control was used to change the step size, and the selflearning ability of the neural network was used to achieve the balance quickly. The PV MPPT achieved a better balance between tracking speed and stability. Simulation and experimental results showed that the MPPT method based on fuzzy neural network adaptive control had strong robustness and adaptive ability.
In order to overcome some shortcomings of the traditional maximum power point tracking (MPPT) method and make the photo voltaic (PV) system work more quickly and accurately at the maximum power output point, an adaptive control method based on fuzzy control and neural network control was proposed. This method made full use of the advantages of fuzzy neural network to deal with nonlinear problems. The fuzzy control was used to change the step size, and the selflearning ability of the neural network was used to achieve the balance quickly. The PV MPPT achieved a better balance between tracking speed and stability. Simulation and experimental results showed that the MPPT method based on fuzzy neural network adaptive control had strong robustness and adaptive ability.
21 Monitoring Method for Overheat Fault of Stator and Rotor Windings ofDoublyFed Induction Generator
2018, 45(11):121-125.
Abstract:
The doublyfed induction generator (DFIG) was prone to overheat faults of stator and rotor windings in long term operation. The winding temperature was taken as the object of study. Based on the analysis of the causes of winding overheat fault, tests were carried out from two aspects of motor thermal performance and parameter identification. Using parameter identification method, resistance was identified for the stator and rotor windings based on the electromagnetic mathematical model of motor, and then the temperature was calculated according to the relationship between resistance and temperature to judge whether the windings were overheated. Finally, the correctness of the identification method of stator and rotor winding parameters was verified by MATLAB simulation, which provided theoretical support for the diagnosis of DFIG overheat fault.
The doublyfed induction generator (DFIG) was prone to overheat faults of stator and rotor windings in long term operation. The winding temperature was taken as the object of study. Based on the analysis of the causes of winding overheat fault, tests were carried out from two aspects of motor thermal performance and parameter identification. Using parameter identification method, resistance was identified for the stator and rotor windings based on the electromagnetic mathematical model of motor, and then the temperature was calculated according to the relationship between resistance and temperature to judge whether the windings were overheated. Finally, the correctness of the identification method of stator and rotor winding parameters was verified by MATLAB simulation, which provided theoretical support for the diagnosis of DFIG overheat fault.
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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.
