학술논문
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 / Phase-locked loop control strategy based on improved dual second-order generalized integrator in two-phase stationary coordinate system
Document Type
Academic Journal
Source
电气技术 / Electrical Engineering. 25(1):23-33
Subject
Language
Chinese
ISSN
1673-3800
Abstract
由于分布式新能源和多样化负荷广泛接入电网,传统基于单同步旋转坐标系的锁相环(SRF-PLL)结构在复杂工况下无法准确地跟踪电网相位、频率等参数,因此本文提出一种在两相静止坐标系下基于改进型双二阶广义积分器(DSOGI)的锁相环控制策略.首先,采用级联谐振滤波器处理低频段奇次谐波,在二阶广义积分正交信号发生器(SOGI-QSG)的基础上添加直流偏置滤除支路,在消除直流扰动、实现正负序电压解耦分离的同时,优化对高频段谐波的抑制;然后,构建αβ 锁相环(PLL)结构,基于小信号控制模型优化动态响应性能,提高锁相精度;最后,通过Matlab/Simulink仿真对比,证明了改进型锁相环控制策略的有效性.
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.
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.