摘要
本文提出三相电路广义 dk-qk 旋转坐标变换理论 ,发展出一种任意次谐波电流的检测方法。所谓广义 dk-qk旋转坐标 ,系指以第 k次待检测谐波电流角频率 kω旋转的两相坐标系统。通过广义坐标变换 ,第 k次谐波电流在dk-qk 坐标系内成为与角频率无关的直流分量 ,从而可通过低通滤波及坐标反变换的方法将其检测出来。该方法具有无论三相电路电压是否畸变 ,理论上都能准确地检测出任意次谐波电流的优点 ,并可用于基波有功和无功电流的检测。因此 ,它可应用于电力系统故障检测、保护和电力有源滤波器谐波电流检测中。
The paper proposes a generalized dq k coordinate transform for three phase circuits,develops a novel method of current detection based on it.The so called dq k generalized coordinate is defined as two phase coordinate frame rotated at the angle frequency kω of the kth harmonic current.By the rotated coordinate transform,the kth harmonic current in three phase circuit becomes a dc component,so it can be filtered easily by a low pass filter and detected.In theory this method can effectively and accurately detect the fundamental current,its active and reactive components and any term harmonic current component of three phase circuit no matter what there are harmonic voltages in three phase circuit.Therefore it can be widely applied to fault detection,protection for power system and active power filter.
出处
《电力系统及其自动化学报》
CSCD
2001年第3期25-29,共5页
Proceedings of the CSU-EPSA
