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Keywords

photovoltaic inverter, current control strategy, state space model, improved robust repetitive control, quasi proportional resonance control

Abstract

In order to improve the power control performance of photovoltaic inverter in microgrid and improve the gridconnected current quality of photovoltaic power generation, the state space model of photovoltaic main circuit in microgrid with PVESS is established in this paper. Based on this model, the detailed design process of improved repetitive control and improved robust compensator are given to improve the structure of traditional repetitive control. In order to improve the stability and tracking accuracy of the control system, the robust compensator is added and the optimal configuration is obtained by the linear matrix inequality method. Then, combined with QPR, a photovoltaic current control strategy based on the improved robust repetitive control and paralleling QPR is proposed. Finally, the strategy verification on the RTDS simulation platform shows that this strategy can effectively improve the tracking performance of current and harmonic suppression capability of the photovoltaic inverter, and the effectiveness of the strategy and engineering application value are verified.

DOI

10.19781/j.issn.1673-9140.2021.03.012

First Page

100

Last Page

110

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