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| State Feedback Based Decoupling Control Strategy for Grid-Connected Inverter with LCL Filter |
| Qu Keqing, Li Wenqi, Ye Tiankai, Zhao Jinbin, Li Fen |
| School of Electrical Engineering Shanghai University of Electric Power Shanghai 200090 China |
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Abstract Abc to dq transformation, which converts stationary reference frame to synchronous reference frame, is adopted to realize no static error control for three-phase grid-connected voltage source inverter (VSI) with LCL filter. However, this kind of coordinate transformation induces coupling impacts between d-axis and q-axis. Therefore, a three-closed-loop decoupling control strategy based on double-inductor current and capacitor voltage feedback is proposed. The proposed strategy realizes dynamic decoupling process of multiple-input multiple-output (MIMO) time invariant system by state feedback. It can not only effectively eliminate the coupling impacts, but also improve the dynamic performance with the high quality of grid-connected current. Simulation and experimental results have verified the proposed control strategy.
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Received: 11 January 2016
Published: 01 November 2016
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2016, Vol. 31 
