基于逆变站动态无功控制的后续换相失败抑制方法  

A Method Based on Constant Reactive Power Control of Inverter to Suppress the Subsequent Commutation Failure in HVDC System

作　　者：汪娟娟[1] 郑睿娜 傅闯 吴秋媚 Wang Juanjuan;Zheng Ruina;Fu Chuang;Wu Qiumei(School of Electric Power South China University of Technology,Guangzhou 510641 China;Guangzhou Power Supply Bureau of Guangdong Power Grid Co.Ltd,Guangzhou 510620 China;State Key Laboratory of HVDC China Southern Power Grid Electric Power Research Institute,Guangzhou 510663 China)

机构地区：[1]华南理工大学电力学院,广州510641 [2]广东电网有限责任公司广州供电局,广州510620 [3]直流输电技术国家重点实验室(南方电网科学研究院有限责任公司),广州510663

出　　处：《电工技术学报》2023年第17期4672-4682,共11页Transactions of China Electrotechnical Society

基　　金：国家自然科学基金资助项目(52277102)。

摘　　要：该文分析了逆变站无功功率随直流电流与关断角变化的趋势,对准稳态下关断角、直流电流及无功功率的可运行范围进行解析,并提出一种基于逆变站动态无功控制的后续换相失败抑制方法。该方法通过对整流侧低压限流单元参数进行整定,并且在逆变侧根据测得的交流母线电压及直流电流实时计算关断角指令,对故障期间逆变站的无功功率进行控制。最后,在电磁暂态仿真软件PSCAD/EMTDC中以CIGRE高压直流标准测试模型及贵广Ⅱ回直流输电工程模型为算例进行仿真验证,结果表明所提方法能够有效地提升系统的故障支撑能力,降低系统发生后续换相失败的概率。AC side fault is the main reason for commutation failure of HVDC system.In the process of AC fault occurrence or removal,or even system recovery,the reactive power impact caused by converter station to AC system is likely to cause subsequent commutation failure due to the influence of commutation bus voltage change and DC control.However,due to the long response time,reactive power compensation equipment is usually difficult to respond in time to suppress subsequent commutation failure,so it is often used as an auxiliary means.In recent years,many methods have been proposed to control the reactive power by optimizing the DC control mode,but most of them do not take into account the transmission delay between the rectifier side and the inverter side.In order to solve these problems,this paper proposes a two-terminal coordination control strategy based on dynamic reactive power control of the inverter station,taking the extinction Angle of the inverter station as the control quantity.Firstly,the variation trend of reactive power of inverter with DC current and extinction angle is analyzed.The operating range of extinction angle,DC current and reactive power in quasi-steady state is analyzed.Then,a method based on constant reactive power control of inverter to suppress the subsequent commutation failure is proposed.By setting the new VDCOL(voltage dependent current order limitation)parameters on the rectifier,and calculating the reference value of the extinction angle in real time according to the AC bus voltage and DC current on the inverter,the reactive power of the inverter is controlled during AC fault.On the one hand,the inverter side controls the reactive power of the inverter station by controlling the extinction Angle.When the AC bus voltage or DC current value detected by the inverter side changes,the reactive power switching capacity can be controlled in real time by directly changing the extinction Angle of the inverter side.The extinction Angle,DC voltage and inverter side AC voltage are coupled to each

关 键 词：高压直流 无功功率 换相失败 故障恢复 

分 类 号：TM712[电气工程—电力系统及自动化]