| 引用本文: | 刘江山,李凤婷,尹纯亚,陈睿康,韩璐,张怿宁.降低暂态压升的混合级联型直流系统控制策略[J].电力自动化设备,2025,45(9):200-207. |
| LIU Jiangshan,LI Fengting,YIN Chunya,CHEN Ruikang,HAN Lu,ZHANG Yining.Control strategy for hybrid cascaded HVDC system to reduce transient overvoltage[J].Electric Power Automation Equipment,2025,45(9):200-207. |
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| 摘要: |
| 针对直流故障导致的送端混合级联型直流系统换流母线暂态过电压问题进行研究。在深入分析混合级联型直流系统暂态功率特性的基础上，建立了换流母线暂态过电压计算表达式，指出整流站内投入的无功补偿容量是影响暂态过电压幅值的主导因素之一，整流站内投入的无功补偿容量与换流母线暂态过电压正相关；基于模块化多电平换流器(MMC)的无功支撑特性，建立了考虑MMC无功支撑能力的暂态电压数学模型；在此基础上，提出了降低暂态压升程度的控制策略，由MMC与无功补偿装置共同支撑稳态运行时电网换相换流器的无功需求，减少整流站投入的无功补偿容量，降低暂态过电压上升程度。基于PSCAD/EMTDC仿真平台搭建混合级联型直流系统仿真模型，验证了所提控制策略的有效性。 |
| 关键词: 混合级联型直流系统 换相失败 直流闭锁 暂态过电压 无功功率 |
| DOI：10.16081/j.epae.202505012 |
| 分类号: |
| 基金项目:国家重点研发计划项目(2021YFB1507001) |
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| Control strategy for hybrid cascaded HVDC system to reduce transient overvoltage |
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LIU Jiangshan1, LI Fengting1, YIN Chunya1, CHEN Ruikang1, HAN Lu1, ZHANG Yining2
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1.School of Electrical Engineering, Xinjiang University, Urumqi 830047, China;2.China Southern Power Grid EHV Transmission Company, Guangzhou 510633, China
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| Abstract: |
| Aiming at the transient overvoltage problem of converter bus caused by DC fault in hybrid cascaded HVDC system at the sending end. Based on the in-depth analysis of the transient power characteristics of hybrid cascaded HVDC system, the calculation expression of transient overvoltage of converter bus is established. It is pointed out that the reactive power compensation capacity input in the rectifier station is one of the dominant factors affecting the amplitude of transient overvoltage, and the reactive power compensation capacity input in the rectifier station is positively correlated with the transient overvoltage of the converter bus. Based on the reactive power support characteristics of modular multi-level converter(MMC),a transient voltage mathematical model considering the reactive power support capability of MMC is established. On this basis, a control strategy to reduce the degree of transient voltage rise is proposed. The MMC and the reactive power compensation devices jointly support the reactive power demand of the grid commutation converter during steady-state operation, the reactive power compensation capacity of the rectifier station and the degree of transient overvoltage are decreased. A hybrid cascaded DC system simulation model is built based on PSCAD/EMTDC simulation platform to verify the effectiveness of the proposed control strategy. |
| Key words: hybrid cascaded HVDC system commutation failure DC blocking transient overvoltage reactive power |
