基于空间矢量双滞环策略的STATCOM直接电流控制方法

提出一种适用于STATCOM的直接电流控制新方法以减小开关频率和电流跟踪误差。该方法通过指令电流求导矩阵替代参考电压预测方法,能够准确判定参考电压矢量的位置,并根据误差电流矢量与双滞环阈值的大小选择优化的开关状态输出。与其它电流控制方法相比,基于空间矢量双滞环策略的直接电流控制方法可以保证无功电流的快速响应性能,同时有效降低开关频率。仿真与实验结果证明其良好的动静态性能。

A Novel Direct Current Control for STATCOM Using Space Vector Based Double Hysteresis Scheme

To reduce the switching frequency and current error of a static synchronous compensator (STATCOM) for reactive power compensation, a novel direct current control strategy is proposed. The proposed controller outputs the optimum switching pattern according to the double band hysteresis threshold scheme. By using reference current derivative transform instead of predictive method, the scheme accurately detects the location of reference voltage vector in stationary reference frame. STATCOM accomplished by this technique can achieve a stable and fast response, while maintaining the switching frequency lower than other conventional current control techniques. Simulation and experimental results are presented to verify the anticipated steady-state and dynamic performance of this control strategy.