Yang Jun, Wang Yue, Zeng Zhidong, Wang Zhao'an
(School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China)
Abstract:
A three-phase hybrid power filter composed of a passive filter and an active power filter,
and the corresponding basic principles are introduced. To patch up the drawback of
traditional control method, a new combined control method is proposed, where the load
harmonic current and source harmonic current are detected simultaneously and the control
ratios KL and KS can be controlled separately. By controlling KL
the filtering performance of the hybrid filter can be controlled, and by controlling KS
the resonance resisting performance of the hybrid filter can be controlled. The control
method is simulated with MATLAB, and a prototype is built to verify the performance. Both
the simulated and experimental results indicate that the source harmonic current is
remarkably reduced, e.g., the dominated 5th order harmonic is reduced to about 1/10.
Keywords: hybrid power filter; harmonics; active power filter