MPC-VSG Based Control Strategy for Dynamic Stability of Frequency and Voltage in Islanded Microgrid

doi:10.11930/j.issn.1004-9649.202302058

Abstract

Abstract: In a high proportion of new energy islanded microgrids, the reduction in the proportion of conventional synchronous generator (SG) will lead to a gradual decrease in their overall inertia. The conventional control strategy cannot effectively coregulate the frequency and voltage in microgrid under low inertia conditions. To simultaneously improve the dynamic stability of the frequency and voltage in the islanded microgrid, this paper proposes a model predictive control (MPC) based frequency-voltage control strategy for energy storage virtual synchronous generator (VSG). By developing a predictive model of VSG, a cost function of frequency and power is designed, and the power reference value of VSG is dynamically corrected after calculating the required active and reactive power increments. Considering that the interaction between SG and VSG reduces the transient voltage stability of the system, the voltage control loop is improved by reducing the angular difference between SG and VSG during transients, and the reactive power reference value is further adjusted. The dynamic stability control of the system frequency and voltage is achieved based on the power reference value. Finally, the simulation results verify the effectiveness of the strategy and the superiority.

Key words: islanded microgrid, model predictive control (MPC), virtual synchronous generator (VSG), frequency and voltage regulation, dynamic stability

SUN Jiahang, WANG Xiaohua, HUANG Jingguang, CAO Hao, MEI Nuonan, LI Zhedong. MPC-VSG Based Control Strategy for Dynamic Stability of Frequency and Voltage in Islanded Microgrid[J]. Electric Power, 2023, 56(6): 51-60,81.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202302058

https://www.electricpower.com.cn/EN/Y2023/V56/I6/51

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