A novel harmonic current detection technique based on a generalized dq/sub k/ coordinate transform for active power filter and fault protection of power system

The paper proposes a novel method of current detection for an active power filter and power system, which is based on a generalized dq/sub k/ coordinate transform. The so-called dg/sub k/ generalized coordinate is defined as the coordinate frame rotated at the angle frequency k/spl omega/ 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.