The method based on a generalized dqk coordinate transform for current detection of an active power filter and power system

The paper proposes a novel method of current detection for an active power filter and power system. It is based on a generalized dq _k coordinate transform. The so called dq_k generalized coordinate is defined as the coordinate frame rotated at the angle frequency kω of the kth harmonic current. This method can effectively and accurately detect the fundamental current, its active and reactive components and any term harmonic current component of a three-phase circuit. Simulation results are carried out to verify the method of current detection