两相静止坐标系下基于改进型双二阶广义积分器的锁相环控制策略

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Abstract Due to the widespread integration of distributed renewable energy sources and diverse load into the power grid, the conventional synchronous reference frame-phase-locked loop (SRF-PLL) structure fails to accurately track grid parameters such as phase and frequency under complex grid conditions. Therefore, this paper proposes a novel phase-locked loop control strategy based on an improved double second-order generalized integrator (DSOGI) in the two-phase stationary coordinate system. Firstly, a cascaded resonant filter is employed to address odd harmonics in the low-frequency range. Additionally, a DC bias filter branch is incorporated based on second-order generalized integrator quadrature signal generator (SOGI-QSG) to mitigate DC disturbances, achieve decoupled separation of positive and negative sequence voltages, and optimize suppression of high-frequency harmonics. Subsequently, a αβ phase-locked loop (PLL) structure is constructed to enhance dynamic response performance by leveraging the small signal control model and improve phase-locking accuracy. Finally, the efficacy of the enhanced phase-locked loop control strategy is validated through comparative simulation using Matlab/Simulink.

Key words： second-order generalized integrator quadrature signal generator (SOGI-QSG) phase-locked loop (PLL) DC bias cascaded resonant filter

Received: 30 August 2023

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	Articles by authors
	HAN Yixin
	ZOU Fumin
	HOU Jun
	ZHANG Qing

Cite this article:

HAN Yixin,ZOU Fumin,HOU Jun等. Phase-locked loop control strategy based on improved dual second-order generalized integrator in two-phase stationary coordinate system[J]. Electrical Engineering, 2024, 25(1): 23-33.

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http://dqjs.cesmedia.cn/EN/Y2024/V25/I1/23

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