基于重复控制的前馈补偿方法研究

军用移动电站的并网系统在向电网馈电的过程中，当电网电压波动，特别是系统工作于轻载时，会使并网系统输出电流畸变，电流谐波含量增高．在研究传统并网电流控制的基础上，首先提出将重复控制引入电网电压前馈控制计算中，达到抑制电网突变对系统前馈的影响和消除电网周期性扰动产生的电流畸变的目的，提高了系统稳定性；然后采用前馈控制和PI控制器串联方式，保证系统的动态性能．实验结果表明，基于重复控制的前馈补偿方法便于实现，该方法能够降低并网电流总谐波，提高系统稳态特性和并网输出电压质量．

Research on Feedforward Compensation Method Based on Repetitive Control

In the process of feeding the grid by the grid-connected system of military mobile power station, when the grid voltage fluctuates, especially when the system operates at light loads, it will distort the output current of grid-connected system, and increase current harmonics. Based on the study of traditional grid-connected current control, repetitive control is introduced into the grid voltage feedforward control calculations so as to suppress mutations on the grid system of feedfor- ward, eliminate periodic disturbances to generate grid current distortion,and4mprove the stability of the s3;stem. Then by using feedforward control method and the PI controller,we can ensure the system dynamic performance. Experimental results show that the feedforward Control based on repetitive control is easy to implement and improve the stability of the system, reduce total har- monic current grid, and improve the quality of output voltage in grid-connected systems.