Abstract
One-cycle control (OCC) is a kind of nonlinear control technology. It is the most advanced reactive power compensation and harmonic suppression method. In the paper, a three-phase four-wire active power filter (APF) with one-cycle control is presented. This method does not need any measured quantities of three-phase input voltages and three-phase load currents, and also not need multipliers. The controller used has simple structure, which is composed of some integrators, flip-flops, comparators etc. The APF proposed has features of high precision and effective compensation. Through the theoretical analysis and the application by the OCC-APF, the results confirm that this approach can achieve the compensation in transient state and steady for the harmonic currents and reactive currents separately, and therefore, shows a good application prospect.
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