Research On The Realization Of Integrated Synchronous Generator Output Currentsharing Control By Moving-Average Filter

Low voltage and high current rectifier module is the core of synchronous generator integrated DC output system.A single power supply module is difficult to achieve low voltage and high current output,and once the power supply failure,the entire power supply system will be paralyzed and unable to operate normally,so it is difficult to meet the requirements of all walks of life for stable operation of power supply,continuous power supply.Therefore,this paper uses a number of parallel power electronic units with controllable rectification function to directly realize the output of low-voltage large direct current,and its modular control improves the control flexibility and fault-tolerant operation ability of the system.Current-sharing technology is the key technology for the uniform current distribution of parallel power electronic power supply modules.Uneven current between each parallel power electronic power supply module will burn down the entire power supply module and reduce the output power,therefore,it is of great significance to study the current-sharing technology.Good current sharing technology not only requires that each power supply module can have similar current when the load is constant,but also can follow the change of load with similar speed when the load is changing dynamically,so as to realize dynamic current sharing.In view of the poor anti-disturbance performance and low control accuracy of the traditional current-sharing method,this paper presents a scheme to realize the current-sharing between parallel rectifier modules based on the least-squares moving average filter.By sampling the current value of each rectifier module circuit,the sampling value is filtered by the least-squares moving average filter,which enhances the anti-interference ability of the current signal and improves the accuracy of the current-sharing control.Then the sampling value is analyzed and compared to select the maximum value as the reference value of the current value.The current is rectified using SVPWM and optimized in the controllable rectification process.A current-sharing loop control is added to form a three-loop control of voltage,current and bus,which ensures the stability of the output voltage and the same output current of each rectifier module.In order to facilitate the research,three parallel power electronic power modules with rectifier function are selected in this paper in parallel,and an integrated generator rectifier system simulation model is established through Matlab/Simulink to realize modular SVPWM rectifier control based on the least squares moving average filter.In the experimental platform,DSP built-in CAN controller is used to realize the communication between modules,complete the digital current sharing control,and finally realize the DC output of the synchronous generator multi-module parallel system 5V/1000 A.Simulation and hardware experiment show that the least squares moving average filter has high control accuracy and anti-disturbance performance.