引用本文:赵永光,艾力西尔·亚尔买买提,汤波,孙修锋,马骏超,辛焕海.串补电容对锁相环主导下变流器振荡问题的影响分析[J].电力自动化设备,2024,44(6):102-109.
ZHAO Yongguang,YAERMAIMAITI Ailixier,TANG Bo,SUN Xiufeng,MA Junchao,XIN Huanhai.Analysis of influence of series complement capacitor on converter oscillation dominated by phase locked loop[J].Electric Power Automation Equipment,2024,44(6):102-109.
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串补电容对锁相环主导下变流器振荡问题的影响分析
赵永光1, 艾力西尔·亚尔买买提2, 汤波1, 孙修锋1, 马骏超3, 辛焕海2
1.上海电力大学 电气工程学院,上海 200090;2.浙江大学 电气工程学院,浙江 杭州 310027;3.国网浙江省电力有限公司电力科学研究院,浙江 杭州 310014
摘要:
串联电容补偿技术在电网中被广泛应用,然而串补电容的动态特性对锁相环型变流器的稳定性有重要的影响。为分析此影响,在极坐标下建立变流器经串补并网系统的阻抗模型,并导出考虑串补电容的广义阻抗判据。在此基础上,阐明了串补电容与锁相环的动态耦合以及相应的稳定机制。进一步地,分析了电网强度、串补度和锁相环参数变化对系统稳定性的影响,并提出基于广义阻抗判据的锁相环参数设计方法,以提升变流器经串补并网系统的稳定性。研究表明变流器经串补并网后容易恶化弱电网下锁相环主导的次同步振荡问题,且提升锁相环比例增益可显著增强串补并网系统的稳定性。
关键词:  串补并网系统  变流器  广义阻抗判据  锁相环  次同步振荡
DOI:10.16081/j.epae.202308010
分类号:
基金项目:国家电网有限公司总部科技项目(5108-202218280A-2-435-XG)
Analysis of influence of series complement capacitor on converter oscillation dominated by phase locked loop
ZHAO Yongguang1, YAERMAIMAITI Ailixier2, TANG Bo1, SUN Xiufeng1, MA Junchao3, XIN Huanhai2
1.Department of Electrical Engineering, Shanghai University of Electric Power, Shanghai 200090, China;2.College of Electrical Engineering, Zhejiang University, Hangzhou 310027, China;3.Electric Power Research Institute of State Grid Zhejiang Electric Power Co.,Ltd.,Hangzhou 310014, China
Abstract:
Series capacitor compensation technology is extensively utilized in power grids. However, the stability of phase locked loop-based inverter is significantly affected by the dynamic characteristics of series complement capacitor. To analyze this influence, an impedance model of the inverter connected to series complementary system is established in polar coordinate system, and the generalized impedance criterion considering series capacitor is derived. On this basis, the dynamic coupling between series complement capacitor and phase locked loop, along with the corresponding stability mechanism are elucidated. Furthermore, the effects of grid strength, series complement capacitor degree, and variations of phase locked loop parameters on system stability are analyzed. To enhance the stability of the inverter connected to series complementary system, a phase locked loop parameter design method based on the generalized impedance criterion is proposed. The research show that the inverter connected to series complementary system tends to exacerbate sub-synchronous oscillation problem under weak grid conditions, and increasing the proportional gain of phase locked loop can significantly enhance the stability of series complementary grid connection system.
Key words:  series complementary grid connection system  electric converters  generalized impedance criterion  phase locked loops  subsynchronous oscillation

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