Selective Harmonic Current Compound Control Strategy Based On Shunt Active Power Filter

The active power filter is one of effective means to solve the harmonic pollution caused by nonlinear load. Based on synchronous rotating coordinate, an improved harmonic extract and current control strategy combining the PI control with deadbeat control is proposed. This strategy can make a selective harmonic show direct current by coordinate transformation and digital low-pass filter, so as to realize the detection and PI control of the selective harmonic current, input the harmonic current commands and fundamental current commands outputted from harmonic PI regulators into the deadbeat controller, finally, realize the selective harmonic current compensation effectively. The shunt APF experimental platform is built for experimental verification based on TMS320F28335. The effectiveness of the control strategy is verified by experimental results.