电工技术学报  2023, Vol. 38 Issue (17): 4672-4682    DOI: 10.19595/j.cnki.1000-6753.tces.221109
电力系统与综合能源 |
基于逆变站动态无功控制的后续换相失败抑制方法
汪娟娟1, 郑睿娜1,2, 傅闯3, 吴秋媚1,2
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
A Method Based on Constant Reactive Power Control of Inverter to Suppress the Subsequent Commutation Failure in HVDC System
Wang Juanjuan1, Zheng Ruina1,2, Fu Chuang3, Wu Qiumei1,2
1. School of Electric Power South China University of Technology Guangzhou 510641 China;
2. Guangzhou Power Supply Bureau of Guangdong Power Grid Co. Ltd Guangzhou 510620 China;
3. State Key Laboratory of HVDC China Southern Power Grid Electric Power Research Institute Guangzhou 510663 China
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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。
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汪娟娟
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关键词 高压直流无功功率换相失败故障恢复    
Abstract: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 other and meet the constraints of quasi-steady state equation.
On the other hand, the operation range of DC current can be calculated according to the quasi-steady-state equation on the rectifier side, and according to the new current instruction given, it can meet the reactive power quantitative demand of the inverter side at the rated extinction Angle. The DC voltage measured by the rectifier side gives the DC current instruction in real time, which is no longer transmitted by the inverter side, so as to avoid the deterioration of the system performance caused by the transmission delay.
Finally, the CIGRE HVDC model and GuiGuang Ⅱ HVDC model in PSCAD/EMTDC are taken as examples. After the improvement, subsequent commutation failure occurs when AC fault is more serious, and the system recovers more smoothly. The results verify that the proposed method can effectively improve the system's support capability during AC fault and reduce the probability of subsequent commutation failure.
This paper mainly studies the dynamic reactive power control strategy of inverter station under three-phase symmetric fault, and the dynamic reactive power control method for single-phase ground fault needs to be further developed.
Key wordsHigh voltage direct current(HVDC)    reactive power    commutation failure    fault recovery   
收稿日期: 2022-06-14     
PACS: TM712  
基金资助:国家自然科学基金资助项目(52277102)
通讯作者: 郑睿娜 女,1997年生,硕士,研究方向为高压直流输电。E-mail:121803325@qq.com   
作者简介: 汪娟娟 女,1974年生,教授,博士生导师,研究方向为电力系统稳定与控制、高压直流输电等。E-mail:epjjwang@scut.edu.cn
引用本文:   
汪娟娟, 郑睿娜, 傅闯, 吴秋媚. 基于逆变站动态无功控制的后续换相失败抑制方法[J]. 电工技术学报, 2023, 38(17): 4672-4682. Wang Juanjuan, Zheng Ruina, Fu Chuang, Wu Qiumei. A Method Based on Constant Reactive Power Control of Inverter to Suppress the Subsequent Commutation Failure in HVDC System. Transactions of China Electrotechnical Society, 2023, 38(17): 4672-4682.
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