Analysis and Optimization of Voltage Dynamic Control Performance of Renewable Energy Microgrid based on Grid-Forming Energy Storage

doi:10.11930/j.issn.1004-9649.202411028

Abstract

Abstract:

The configuration of grid-forming energy storage devices can effectively suppress the voltage dynamic overvoltage caused by load switching and distributed new energy output fluctuation in new energy microgrid. However, the existing research is mostly based on the single-machine grid-forming energy storage sensitive line access model, ignoring the influence of the system active-active coupling and the ratio of the microgrid line resistance to inductance, and only the conclusion that the reactive control parameter is the dominant factor of the voltage dynamic control can be obtained Therefore, this paper constructs a system voltage dynamic model containing grid-forming energy storage, distributed new energy and microgrid network, and uses the mapping relationship between the minimum singular value of closed-loop response matrix of the system voltage dynamic model and the voltage dynamic control performance to analyze the influence of the configuration of the grid-forming energy storage control parameters on the dynamic control performance under different resistance-inductance ratios. A parameter design method for the grid-forming energy storage with the goal of enhancing the voltage dynamic control performance is proposed verified by a simulation system. The proposed method reveals the synergy and constraint relationship between the active and reactive control parameters of the grid-forming energy storage under different resistance-induct ratios.

Key words: renewable energy microgrid, dynamic modelling, dynamics control technology

ZHANG Chenyu, YU Jianyu, SHI Mingming, LIU Ruihuang. Analysis and Optimization of Voltage Dynamic Control Performance of Renewable Energy Microgrid based on Grid-Forming Energy Storage[J]. Electric Power, 2025, 58(9): 115-123.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202411028

https://www.electricpower.com.cn/EN/Y2025/V58/I9/115

Figures/Tables 10

Fig.1 Typical renewable energy microgrid based on grid-forming energy storage

Fig.2 Voltage dynamic modeling in renewable energy microgrids with grid-forming energy storage

Fig.3 Performance analysis method and parameter design steps for system voltage dynamic control based on minimum singular value calculation

Fig.4 Influence of grid-forming energy storage inertia coefficient Jp and stiffness coefficient Kc on the minimum singular value of the closed-loop response matrix of the system

Fig.5 Simulation system topology

Fig.6 Effect of Kc and Jp parameter configuration on suppression for voltage fluctuations with R/X=0.1

Fig.7 Effect of Kc and Jp parameter configuration on suppression for voltage fluctuations with R/X=0.5

Fig.8 Effect of Kc and Jp parameter configuration on suppression for voltage fluctuations with R/X=1.0

Fig.9 The dynamic control performance of voltage under active power disturbances with the proposed parameter design method

Fig.10 The dynamic control performance of voltage under reactive power disturbances with the proposed parameter design method

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