State optimizing vector control strategy for active power filter

The vector control model for 3-phase 3-wire active power filter is constructed in this paper, which introduces the concepts of equivalent source voltage vector, current error vector and current error hexagon. A three phase correlated state optimizing vector control strategy based on this model is proposed, which solved the knotty problem of dependent action among the converter´s legs. Two aspects of the strategy in the process of implementation are discussed in detail, named vector optimizing and current error movement routing respectively, and the solution of rotating space vector problem is turned into simple plane geometry question. The control strategy has the feature of higher control precision and lower switching frequency. Software simulation has verified the validity and feasibility of the proposed model and control strategy