Research on Realization of Integrated Output Current Sharing Control by Moving Average Filter for Synchronous Generator

The low voltage, high current rectifier module is the core of the integrated DC output system based on synchronous generators. In addition, modular control improves the flexibility of the system control and fault-tolerant operation ability. Due to the dispersion of the on-state voltage drop of switching devices, it is possible to cause a circulating current fault between the parallel modules, which leads to the reduction of the current sharing characteristics and stability of the system. Therefore, it is significant to address the shortcomings of traditional current sharing methods such as poor anti-disturbance performance. This paper proposes a current sharing scheme that improves the control accuracy by filtering the sampled current on the basis of autonomous sharing of maximum current. Furthermore, a model of the integrated generator rectifier system was established by Simulink to realize the simulation of the modular SVPWM (Space-Vector Pulse-Width Modulation) rectifier control based on MA (Moving Average) filtering algorithm. At last, an experimental platform was built in this paper in order to verify the feasibility of the theory. In this experimental platform, the controller completes digital current sharing control and finally realizes the synchronous generator module paralleling system 5 V/1000A DC output. The simulation and experiment demonstrate that the integrated output current sharing control method in this paper has higher control precision and better anti-interference performance.