Combined voltage control system of series single-phase filter-compensating device

Abstract

Management of power supply modes should ensure compliance with three main conditions: economy of power supply operation, reliability of power supply to consumers, standard quality of electricity. Passive filters with an unchanged structure are less and less satisfying the requirements for maintaining the quality of electrical energy. As a result, power active filter compensating device are developed and implemented. In case of power supply voltage distortion, a series filter compensating device is used, which is connected to the network through a single-phase double-winding series voltage transformer. In the prior investigation it has been found, that during operation of the filter-compensating device the load current creates an additional voltage drop in the transformer winding. The use of a closed loop system does not compensate for said influence. Based on the results of automatic control system circuit analysis, the combined system is selected. Using the methods of automatic control theory, transfer functions necessary for the implementation of the combined control system are determined. Based on mathematical modeling methods, a model of a single-phase series active filter-compensating device has been created. As a result of the experiments, the coefficient of nonlinear distortion was reduced to 1.17%. Conclusions were drawn on the rationality of the proposed solution. The obtained automatic control system can be used to regulation voltage and current of a series filter-compensation device.