基于反馈型重复控制的STATCOM电流控制策略

STATCOM Current Control Strategy Based on Feedback Repetitive Control

在新能源及工矿等诸多应用领域,无功补偿和谐波抑制的需求往往同时存在,常规静止同步补偿器(STATCOM)+FC的补偿方式在经济性和技术性上难以满足要求。基于比例积分(PI)控制对直流量的零静差跟踪和重复控制器对周期性信号的高增益控制,提出了一种PI+反馈型重复控制的电流控制策略,实现了PI控制内环和重复控制外环在控制指令、控制量和响应时间上的解耦,获得了良好的阶跃响应和谐波补偿性能。该控制策略可通过准谐振型滤波器灵活提取网侧电流中的谐波,实现特定次谐波抑制。实验结果验证了所提出控制策略的有效性。

In many applications such as new energy and industrial and mining,the demand for reactive power compensation and harmonic suppression often exist at the same time.The compensation method of conventional static synchronous compensator(STATCOM)+FC is difficult to meet the requirements in terms of economy and technology.Based on the proportion integral(PI)control,the zero-station tracking of the DC signal and the high-gain control of the repetitive controller for the periodic signal,a PI+feedback type repetitive control current control strategy is proposed,which realizes the PI control inner loop and the repetitive control outer loop.The decoupling of control commands,control quantities and response times achieves good step response and harmonic compensation performance.The control strategy can flexibly extract harmonics in the grid side current through a quasi-resonant bandpass filter to achieve specific subharmonic suppression.The experimental results verify the effectiveness of the proposed control strategy.