单相自适应检测在三相无功及谐波电流检测中应用

电力有源滤波器作为一种有效的抑制谐波干扰的动态补偿装置，要求对无功电流、高次谐波电流、负序电流等补偿参考电流进行高精度的瞬时检测。根据传统有功功率的定义和自适应干扰对消原理，在仿真分析自适应检测电路的动态特性和检测精度关系的基础上，提出其一个改进的检测电路。改进的检测电路继承了自适应检测电路的优点，而且在保持一定的检测精度时具有更好的跟随性能。同时，在这种改进的单相检测电路基础上，按流入电源电流三相平衡原则，形成三相检测电路，它能适用于三相负荷不平衡时的检测。仿真结果表明了它的可行性。

Three phase harmonic and reactive currents detecting based on single-phase adaptive detection

Active power filter ,as an effective dynamic compensation device for inhibiting harmonic interference ,requests the precise and instant detection of the reference compensation currents ,such as reactive current ,harmonic currents and negative current.According to the conventional definition of active power and the adaptive interference canceling theory ,and based on the simulative analysis of the relationship between the dynamic characteristics of adaptive detecting circuit and the detec - ting precision ,an improved detecting circuit is presented.It keeps a certain detecting precision while has a better following performance.Furthermore ,according to three - phase balance principle ,a three - phase detection circuit is formed based on this single - phase adaptive detecting circuit ,which can detect the unbalanced three phase currents.Simulation results show its feasibility.