Grid-forming and Grid-Following Dual-Mode Switching Strategy Based on APS-IPSO for Grid-Forming Energy Storage

CHEN Xiaoyang; LI Chenyang; XU Hengshan; MA Xin; MI Ma; SUO Langpingcuo

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Grid-forming and Grid-Following Dual-Mode Switching Strategy Based on APS-IPSO for Grid-Forming Energy Storage

CHEN Xiaoyang¹, LI Chenyang¹, XU Hengshan¹, MA Xin², MI Ma³, SUO Langpingcuo³

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Abstract

【Objectives】 In order to solve the problem that grid-based energy storage is difficult to adapt to the change of grid short-circuit ratio and complex fault disturbance due to the single operation mode of the converter, this paper proposes a dual-mode improved switching strategy based on amplitude and phase synchronization (APS), and uses the improved particle swarm optimization (IPSO) to identify its key parameters. 【Methods】 Firstly, this paper analyzes the shortcomings of the conventional Grid-forming and Grid-following Dual-Mode Switching Strategy, and reveals the mechanism of the voltage phase accumulation error of the power loop and the resulting reactive voltage deviation that increases the transient impact during mode switching. Based on this, an amplitude and phase synchronous compensation mechanism is proposed, which simultaneously corrects the voltage amplitude and phase signal during the mode switching process and realizes the smooth change of the inner loop current reference signal. Then, in view of the shortcomings of the tracking loop parameters in the conventional switching strategy, an IPSO algorithm based on nonlinear inertia weights and learning factors is used to adaptively identify the parameters of the four groups of tracking loops, so as to improve the tracking performance and disturbance suppression effect of the energy storage converter on the operation points of the Grid-following and Grid-forming Modes. 【Results】 Finally, a MW-level grid- forming energy storage electromagnetic transient model was built in Matlab/Simulink for verification, and the results showed that the proposed control strategy could successfully achieve a transient power impact of less than 0.02 p.u., and could operate stably in the scenarios of continuous switching and operation point fluctuation. 【Conclusions】 Compared with the conventional switching strategy, the improved strategy based on APS-IPSO can realize the small switching impact and good stability of the energy storage converter in the Grid-following-Grid-forming Modes, and provides a theoretical basis for the subsequent deployment of energy storage or new energy units with mode switching in new energy stations.

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grid-forming energy storage / weak power grids / constant power control / virtual synchronous generator / control mode switching

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CHEN Xiaoyang, LI Chenyang, XU Hengshan, MA Xin, MI Ma, SUO Langpingcuo. Grid-forming and Grid-Following Dual-Mode Switching Strategy Based on APS-IPSO for Grid-Forming Energy Storage[J]. Electric Power Construction. 0

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