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弱电网下基于DSOGI-PLL的并网换流器频率耦合阻抗建模与稳定性分析
史金柱, 杨黎晖, 朱美婷
西安交通大学 电气工程学院,陕西 西安 710049
摘要:
三相电压源型换流器作为中低压直流配用电系统并网常用的接口电路,在系统运行中发挥着重要的作用。为了解决弱电网下基于双二阶广义积分器的锁相环(DSOGI-PLL)的并网换流器失稳的问题,首先建立了DSOGI-PLL的频率耦合阻抗模型,然后综合考虑多种频率耦合因素建立了并网换流器的频率耦合阻抗模型。基于此模型分析了DSOGI-PLL参数、直流电压环带宽以及电流内环带宽比对于并网换流器频率耦合特性的影响。然后推导了考虑频率耦合特性的等效单输入单输出奈奎斯特稳定判据,进而研究了各种因素对于并网换流器系统稳定性的影响。最后基于MATLAB/Simulink对频率耦合阻抗模型和系统稳定性进行了仿真验证,证明了所提频率耦合阻抗模型和理论分析的准确性。
关键词:  弱电网  DSOGI-PLL  频率耦合阻抗建模  奈奎斯特稳定判据  稳定性
DOI:10.16081/j.epae.202202016
分类号:TM46;TM712
基金项目:陕西省重点研发计划项目(2021GY-132);中央高校基本科研业务费专项资金资助项目(xjj2018007)
Frequency coupling impedance modeling and stability analysis of grid-connected converter based on DSOGI-PLL in weak grid
SHI Jinzhu, YANG Lihui, ZHU Meiting
School of Electrical Engineering, Xi’an Jiaotong University, Xi’an 710049, China
Abstract:
As a common interface circuit for the medium-and low-voltage DC power distribution system integrated to the grid, three-phase voltage source converter plays an important role in system operation. To solve the instability problem of the grid-connected converter with the DSOGI-PLL(Double Second Order Generalized Integrator-Phase Locked Loop) in weak grid, the frequency coupling impedance model of DSOGI-PLL is firstly established, and then the frequency coupling impedance model of the grid-connected converter considering a variety of frequency coupling factors is built. Based on this model, the effects of DSOGI-PLL parameters, DC voltage loop bandwidth and current inner loop bandwidth ratio on the frequency coupling characteristics of grid-connected converter are analyzed. Then, the equivalent single-input single-output Nyquist stability criterion considering the frequency coupling characteristics is derived, and the influence of various factors on the stability of the grid-connected converter system is studied. Finally, based on the MATLAB/Simulink, the frequency coupling impedance model and system stability are simulated and verified, which proves the accuracy of the proposed frequency coupling impedance model and the theoretical analysis.
Key words:  weak grid  DSOGI-PLL  frequency coupling impedance modeling  Nyquist stability criterion  stability

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