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Energies 2017, 10(12), 2159; https://doi.org/10.3390/en10122159

Power Decoupling Method Based on the Diagonal Compensating Matrix for VSG-Controlled Parallel Inverters in the Microgrid

State Key Laboratory of Power Transmission Equipment & System Security and New Technology, Chongqing University, Shapingba District, Chongqing 400044, China
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Received: 19 November 2017 / Revised: 11 December 2017 / Accepted: 13 December 2017 / Published: 17 December 2017
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Abstract

The thought of the virtual synchronous generator (VSG) for controlling the grid-connected inverters and providing virtual inertia to the microgrid is emerging as a wide extension of the droop control, power coupling that always exists in the low-voltage microgrid, which may deteriorate the dynamic response and the stability of the system. In this paper, the principle of VSG control is introduced first. As an important issue of VSG control, the mechanism of the power coupling in the low-voltage microgrid is analyzed and the small-signal equivalent model of the power transmission loop is established. Subsequently, a power decoupling method based on the diagonal compensating matrix for VSG is proposed, which can realize the power decoupling with no impact on the original control channel. Meanwhile, the feasibility analysis of the decoupling method and the improved approach for reactive power sharing are also discussed. Simulation results verify the effectiveness of the decoupling strategy for VSGs. View Full-Text
Keywords: virtual synchronous generator (VSG); power decoupling; diagonal compensating matrix; small signal model virtual synchronous generator (VSG); power decoupling; diagonal compensating matrix; small signal model
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Li, B.; Zhou, L. Power Decoupling Method Based on the Diagonal Compensating Matrix for VSG-Controlled Parallel Inverters in the Microgrid. Energies 2017, 10, 2159.

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