SPWM型DSTATCOM的双变量协调控制

基于SPWM变流器结构的静止同步补偿器(DSTATCOM)是一种新型无功补偿装置,它具有发出容性无功功率和吸收感性无功功率的双向补偿功能。通过实验探讨了SPWM型DSTATCOM的控制策略,比较了不同控制策略下DSTATCOM的动态性能。实验结果表明,采用控制角与调制深度相结合的双变量协调控制能获得更好的动态性能。在经典的PI控制中引入前馈环节,进一步提高了装置的响应速度。实验装置从输出容性(感性)额定无功功率切换到感性(容性)无功功率的调节时间不到两个工频周期。

Dual-variables Control of SPWM-based DSTATCOM

DSTATCOM based on voltage source converter is a new type of reactive power compensator,which can generate or draw reactive power from the power network. The control way of SPWM-based DSTATCOM is investigated, and the dynamic performance of DSTATCOM with different control strategies is compared.The experimental results show that the co-control of control angle and modulation index has better dynamic characteristics.A forward link added to the classic PI controller improves dynamic response,and the regulating time of the tested device from the rated leading var (lagging var) to lagging var (leading var) is less than two cycles.