电网频率小扰动下虚拟同步发电机统一模型关键参数辨识

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Abstract Aiming at the diversification of virtual synchronous generator (VSG) control strategies of grid-connected inverters, a unified linearization model of virtual synchronous generators is established, and the identification method of the inverter’s actual output equivalent inertia and damping coefficient is proposed to quantify its support capability to the grid. From the perspective of grid frequency perturbation and considering the influence of phase-locked loop and filter in the inverter sampling link, a unified small-signal model capable of characterizing the dynamic and static regulation performance of the virtual synchronous generator is established. According to the established model, the zero-pole method is used to analyze the influence of control parameters on the system. The grid frequency disturbance and load disturbance are used to excite the system power dynamic information, and the stochastic gradient method based on the multiple new interest theory is used to identify the equivalent inertia and damping coefficient of the inverter output. Finally, the system simulation model is built to verify the correctness and effectiveness of the analysis and identification methods.

Key words： virtual synchronous generator (VSG) unified model equivalent damping equivalent inertia parameter identification

Received: 28 March 2022

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	Articles by authors
	ZHU Jun
	QU Yubo
	LIU Penghui
	GUO Xiangwei
	DU Shaotong

Cite this article:

ZHU Jun,QU Yubo,LIU Penghui等. Identification of key parameters of virtual synchronous generator unified model under small frequency disturbance of power grid[J]. Electrical Engineering, 2022, 23(7): 26-33.

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http://dqjs.cesmedia.cn/EN/Y2022/V23/I7/26

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