基于SBPF的链式STATCOM不对称控制策略

Unbalanced Control Scheme for Cascade STATCOM Based on SBPF

系统电压不平衡时,链式静止同步补偿器(STATCOM)应保持稳定运行,以提高系统功率因数及电压稳定性。但传统功率解耦控制的链式STATCOM在系统电压不平衡条件下,其运行性能会严重恶化。为此,提出一种新的采用星形联接的链式STATCOM的控制策略,将选择性带通滤波器(SBPF)与功率解耦控制相结合,实现链式STATCOM的不平衡控制及快速响应性能。仿真结果显示,所提的控制算法能显著提高链式STATCOM在系统电压不平衡时的运行稳定性及补偿效果。

Under unbalanced system voltages,the operation of cascade static synchronous compensator（STATCOM） shall be maintained in stable state so as to make contribution to power factor correction and voltage stability.However,the performance of a cascade STATCOM with traditional decoupling power control will drastically deteriorate under unbalanced voltages.Therefore,a novel control scheme for star-connected cascade STATCOM operating under voltage unbalance is proposed,in which the selective band pass filter（SBPF） is combined with decoupling power control to realize unbalanced control and rapid response characteristic of STATCOM.Simulation results show that the control scheme can significantly improve the operation stability and compensation effect of the cascade STATCOM under unbalanced voltages compared with the traditional decoupling power control algorithm.