基于STATCOM的自励异步发电机不对称负载控制

针对独立自励异步发电机(SEIG)加载后电压和频率聚降的问题,提出了一种带储能装置的静止同步补偿器(STATCOM)对其进行并联补偿,以维持负载后机端电压和频率的稳定.基于自然坐标系的控制策略,实现STATCOM有功和无功的解耦控制,达到稳压稳频的目的.为了减小不对称负载电流对发电系统造成的危害,在三相参考电流中注入定子电流负序分量加以抑制.该控制策略在d SPACE+Quanser8实验平台上进行验证,结果表明,所采用的控制策略能有效提高异步发电机的负载能力和电能质量.

Control of unsymmetrical load of self-excited induction generator based on STATCOM

In order to solve the problem that the voltage and frequency of self excited induction generator （SEIG） sharply drop after loading, a static synchronous compensator （STATCOM） with an energy storage device was proposed to connect in parallel with the SEIG and perform the compensation, and thus the terminal voltage and frequency after loading could maintain constant. Based on the control strategy for the natural coordinate system, the decoupling control of active power and reactive power of STATCOM could be realized, and the goal of constant voltage and constant frequency could be achieved. In order to reduce the harm to power system caused by unsymmetrical load current, the negative sequence component of stator current was injected into the three phase reference current. The control strategy was verified on dSPACE+Quanser8 experiment platform. The results show that the adopted control strategy can effectively improve the loading capacity and power quality of SEIG.