适用于非理想条件下的自适应自抗扰锁相环技术  

Technology of Adaptive Phase-locked Loop Based on ADRC under Non-ideal Conditions

作　　者：张威 李永丽 李涛 赵自刚 耿少博 ZHANG Wei;LI Yongli;LI Tao;ZHAO Zigang;GENG Shaobo(School of Electrical and Information Engineering,Tianjin University,Tianjin 300072,China;State Grid Hebei Electric Power Co.,Ltd,Shijiazhuang 050011,China)

机构地区：[1]天津大学电气自动化与信息工程学院,天津300072 [2]国网河北省电力有限公司,石家庄050011

出　　处：《电力系统及其自动化学报》2021年第9期74-81,共8页Proceedings of the CSU-EPSA

基　　金：国家电网有限公司总部科技资助项目(SGHE0000DKJS1900093,适应灵活可控源荷接入的新型城市电网继电保护关键技术研究及应用)。

摘　　要：为解决传统三相同步锁相环在电网电压波动时无法精确锁相的问题,本文通过引入二阶线性自抗扰控制技术代替传统PI控制,并利用其扩张状态观测器对各状态变量进行估计和补偿实现锁相。基于二阶广义积分器的移相特性提出一种快速计算正序电压幅值的算法,并以此为基础设计一种可以根据电压跌落深度自适应调节参数的自抗扰锁相环结构。仿真和实验表明,所提出的锁相环结构可以有效提高锁相环的动态性能,且能在非理想的工况下为逆变器并网发电提供可靠的基准信号。To solve the problem that the traditional three-phase synchronous reference frame-phase locked loop(SRFPLL)cannot accurately realize phase lock under grid voltage fluctuations,the technology of second-order linear active disturbance rejection control(LADRC)is introduced in this paper to replace the traditional PI controller,and an extended state observer(ESO)is used to estimate and compensate each state variable to realize phase lock.Based on the phase-shift characteristics of second-order generalized integrator(SOGI),an algorithm that can quicklycalculate the positive-sequence voltage amplitude is proposed.On this basis,a LADRC-PLL structure is designed,which can adaptively adjust the parameters according to the voltage drop depth.Finally,simulation and experimental results verifiedthat the proposed PLL structure can effectively improve the dynamic performance of PLL and provide reliable reference signals for the grid-connected power generation with inverters under non-ideal grid conditions.

关 键 词：锁相环 线性自抗扰控制 电压不平衡 频率突变 自适应参数调节 

分 类 号：TM77[电气工程—电力系统及自动化]