| 引用本文: | 王敬龙,尹纯亚,李笑竹,梁晨光,张天庆.混合串联直流输电换流阀拓扑结构及控制策略[J].电力系统保护与控制,2025,53(24):153-164.[点击复制] |
| WANG Jinglong,YIN Chunya,LI Xiaozhu,LIANG Chenguang,ZHANG Tianqing.Hybrid series HVDC converter valve topology and control strategy[J].Power System Protection and Control,2025,53(24):153-164[点击复制] |
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| 摘要: |
| 针对交流系统故障易导致传统高压直流输电换相失败(commutation failure, CF)的问题，提出基于半控与全控器件混合串联的可控电容换流阀拓扑及控制策略。首先，构建了提升换相失败抵御能力的混合串联换流阀拓扑结构，基于换相过程分析得出电容投入能够显著增加换相电压时间面积，从而降低CF风险。其次，揭示了电容容量、投入时机对换相性能的影响机制。结合全控器件的电压和电流应力特性，确定了电容与可关断管的选型定容。然后，设计了基于瞬时线电压幅值检测的自适应控制策略，通过实时监测交流系统电压变化，自适应调整全控器件的关断时序，进一步提升了换相失败抑制效果。最后，基于PSCAD/EMTDC搭建仿真模型，验证了所提方案的有效性。结果表明该拓扑及控制策略能够在轻微到严重故障范围内有效抑制CF。 |
| 关键词: 高压直流输电 换相失败 混合串联换流阀 参数设计 自适应控制策略 |
| DOI：10.19783/j.cnki.pspc.250300 |
| 投稿时间：2025-03-23修订日期：2025-07-30 |
| 基金项目:国家自然科学基金项目资助(52367013)；北京市自然科学基金重点研究专题资助(L242008) |
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| Hybrid series HVDC converter valve topology and control strategy |
| WANG Jinglong1,YIN Chunya1,LI Xiaozhu1,LIANG Chenguang2,ZHANG Tianqing3 |
| (1. College of Electrical Engineering, Xinjiang University, Urumqi 830017, China; 2. State Grid Economic and Technological
Research Institute Co., Ltd., Beijing 102211, China; 3. State Grid Handan Power Supply Company, Handan 056000, China) |
| Abstract: |
| To address the issue of commutation failure (CF) in conventional HVDC transmission systems caused by AC system faults, this paper proposes a controllable capacitor converter valve topology and control strategy based on hybrid series connection of semi-controlled and fully-controlled devices. First, a hybrid series converter valve topology is developed to enhance the system’s ability to withstand CF. Based on commutation process analysis, it shows that capacitor insertion can significantly increase the commutation voltage-time area, thereby reducing CF risk. Moreover, the mechanisms by which capacitor capacity and insertion timing affect commutation performance are revealed. Considering the voltage and current stress characteristics of fully-controlled devices, the sizing and selection of capacitors and turn-off devices are determined. Subsequently, an adaptive control strategy based on instantaneous line voltage magnitude detection is designed. By monitoring AC system voltage variations in real time and adaptively adjusting the turn-off timing of fully-controlled devices, the suppression of CF is further improved. Finally, a simulation model built in PSCAD/EMTDC verifies the effectiveness of the proposed scheme. The results demonstrate that the proposed topology and control strategy can effectively suppress CF across a wide range of fault severities from mild to severe. |
| Key words: HVDC commutation failure (CF) hybrid series converter valve parameter design adaptive control strategy |
