Study on Virtual Inertia Dynamic Interval Control Strategy for VSG

doi:10.3969/j.issn.1000-7229.2019.02.006

Abstract

Abstract: With the high penetration of photovoltaic power generation system accessing power grid， due to the lack of the moment of inertia， the photovoltaic inverter seriously threatens the stability of the system. According to the traditional generator's model， the equivalent model of the virtual synchronous generator is established. According to the principle of power conservation， when the photovoltaic power output is fluctuating or the load fluctuates， due to the existence of energy storage and the controllability of its power， the battery can provide transient power similar to that on the rotor of the synchronous generator. Because characteristics of the battery is different from the rotor which stores energy through rotation， the battery provides different inertial support under different SOC state. At the same time， in order to ensure the stability of the system frequency， minimum moment of inertia is needed. In this paper， an adaptive optimal control scheme for VSG is proposed according to the change of SOC and the improvement of frequency. Finally， simulation results in MATLAB/simulink verify the effectiveness of the analysis.

Key words: virtual synchronous generator （VSG）, virtual inertia, self-adaption, state of charge, improvement of frequency

CLC Number:

TM 712

SONG Zhenhao， LU Limin， XU Zheng3，LU Zhipeng， WU Ming， ZHAO Ting. Study on Virtual Inertia Dynamic Interval Control Strategy for VSG[J]. Electric Power Construction, 2019, 40(2): 45-53.

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