级联型SVG序阻抗建模与电网适应性研究  

Research on Cascaded SVG Sequence Impedance Modeling and Grid Adaptability

作　　者：朱明星[1,2] 王柘 张华赢 ZHU Mingxing;WANG Zhe;ZHANG Huaying(College of Electrical Engineering and Automation,Anhui University,Hefei 230601,China;Power Quality Engineering Research Center of Ministry of Education,Anhui University,Hefei 230601,China;New Smart City High-quality Power Supply Joint Laboratory of China Southern Power Grid(Shenzhen Power Supply Bureau Co.,Ltd),Shenzhen 518020,China)

机构地区：[1]安徽大学电气工程与自动化学院,合肥230601 [2]安徽大学电能质量教育部工程中心,合肥230601 [3]南方电网公司新型智慧城市高品质供电联合实验室(深圳供电局有限公司),深圳518020

出　　处：《电力系统及其自动化学报》2023年第6期90-98,共9页Proceedings of the CSU-EPSA

基　　金：南方电网公司科技项目(090000KK52190169/SZKJXM2019669)。

摘　　要：针对级联静止无功发生装置并网运行时与电网及电缆线路的谐振问题,基于阻抗分析法对级联静止无功发生装置的序阻抗特性进行分析,并研究了级联静止无功发生装置与电网谐振的机理和抑制策略。首先,阐述了级联静止无功发生装置的主电路结构及基本控制,建立了级联静止无功发生装置的频域模型;其次,基于阻抗分析法建立了考虑控制环节在内的级联静止无功发生装置序阻抗模型,基于序阻抗模型研究了级联静止无功发生装置与电网交互谐振的机理;然后,通过仿真软件和实际案例分析分别验证了所推导级联静止无功发生装置序阻抗模型的正确性和级联静止无功发生装置与电网交互谐振的机理;最后,从网侧和静止无功发生装置设备侧分别提出了级联静止无功发生装置并网谐振的抑制策略,结合实际案例分析验证了抑制策略的有效性。Aimed at the problem that a cascaded static var generator(SVG)will resonate with power grid and cable lines when it is connected to the grid,its impedance characteristics are analyzed using the impedance analysis method,and the mechanism of resonance between the cascaded SVG and grid and the corresponding suppression strategy are studied.First,the main circuit structure and basic control of the cascaded SVG are elaborated upon,and its frequency-domain model is established.Second,based on the impedance analysis method,a sequence impedance model of the cascaded SVG considering the control link is built,and the mechanism of interactive resonance between the cascaded SVG and grid is studied based on the sequence impedance model.Third,the derived cascaded SVG sequence imped⁃ance model and the mechanism of interactive resonance between the cascaded SVG and grid are verified by a simulation software and the analysis of a real example.Finally,the suppression strategies for the cascaded SVG grid-connected res⁃onance are proposed from the grid and SVG device sides,respectively,and the effectiveness of the suppression strategy is verified by combining the analysis of the real example.

关 键 词：级联静止无功发生装置 谐振 序阻抗模型 抑制策略 

分 类 号：TM711[电气工程—电力系统及自动化]