考虑衰减直流分量的动态电压恢复器补偿量的直接检测方法

针对故障信号中的衰减直流分量影响电压补偿量检测的实时性与补偿精度问题,分别利用三角函数周期性的特点以及三角函数与其导数之间的关系提出了滤除衰减直流分量的半周期算法和三点算法,这两种算法可以从故障信号中快速提取出基波分量,再结合瞬时序分量分解环节提取出基波正序电压分量,然后用直接检测算法求出电压补偿量的大小。仿真结果表明,半周期算法和三点算法都具有实现简单、实时性好的特点,适用于动态电压恢复器的实际应用。

Direct Detection of Compensation Signal for Dynamic Voltage Restorer Considering Decaying DC Component

The decaying DC component in fault signal impacts the real-time performance and compensation accuracy of voltage compensation detection. The authors propose a semi-period algorithm and three points algorithm by use of the periodic feature of trigonometric function and the relation between trigonometric function and its derivative respectively. The two algorithms can quickly extract fundamental component from fault signal then extract the fundamental positive sequence voltage by instantaneous decomposition link of sequential components, and then the quantity of voltage compensation can be solved by direct detection algorithm. Simulation results show that both semi-period algorithm and three points algorithm possess the feature of simple implementation and good real-time performance, so it is suitable to the practical application of dynamic voltage restorer.