An improved detection method using generalized reactive current to rapidly correct k is presented.The method solves the time delay problem in conventional UPF harmonic current detection method which adopts conventional low-pass filter to detect multiple equivalent conductance k.In the proposed method

a correction conductance k0 which characterizes the values of transient harmonic and reactive current is added to the previous k to improve dynamic respond performance.MATLAB simulating results indicate that the real time and speedy properties of the improved UPF detection are better than the conventional detection.Experimental results validate that this modified detection method is feasible and effective.