改进的无功补偿空间矢量控制策略

以控制电流跟踪误差和恒定开关频率为目标,文中基于空间矢量提出了一种改善型的适用于无功补偿的控制方法。该方法的开关矢量通过参考电压矢量与误差电流在α-β平面直接合成,不再局限于八组基本空间矢量,从而更有效地抑制了误差电流。空间矢量脉宽调制采用三相电压差值来计算相邻基本电压矢量的作用时间,差值算法在实现恒定开关频率的同时大大简化了传统方法的计算量。仿真实验证明了该控制策略简单可靠、鲁棒性强、易于离散化实现,具有良好的补偿性能。

Improved Compensation Strategy of Reactive Power Based on Voltage Space Vector

In order to control the constant switching frequency and current error of a reactive power compensation device,an improved control algorithm based on space vector modulation is proposed.The switching vector in this algorithm is directly obtained by reference voltage vector and the current error on α-β plane,which is not limited to eight basic space vectors and can inhibit error current more effectively.Space vector pulse width modulation is implemented through the 3 phase voltage difference computation,which leads to the simplified calculation and the constant switching frequency.The simulation results show that the proposed strategy is simple and reliable for digital control and the compensation performance is satisfactory.