| 引用本文: | 王思超,文俊,贺冬珊,等.受端分层UHVDC换相失败控制和恢复策略[J].电力系统保护与控制,2020,48(2):172-179.[点击复制] |
| WANG Sichao,WEN Jun,HE Dongshan,et al.Commutation failure control and recovery strategy of UHVDCwith hierarchical connection mode[J].Power System Protection and Control,2020,48(2):172-179[点击复制] |
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| 摘要: |
| 受端分层的特高压直流输电工程在交流系统单一电压等级发生故障时，不仅会导致本层阀组发生换相失败，而且可能引发另外一层阀组换相失败。在故障恢复过程中，层间交直流系统的相互影响还会引发连续多次换相失败。提出基于实时故障检测判定的换相失败控制和恢复策略，可准确判定故障状态、故障发生的电压层级、故障的持续时间。针对交流系统瞬时性故障，仅在发生严重故障时启动控制策略，并防止恢复过程中提前再启动，减少自动再启动次数。当单层交流系统永久性严重故障时，隔离故障层，转为双极半压运行方式。根据昌吉-古泉特高压直流输电工程搭建PSCAD/EMTDC仿真模型，设置多种故障情况，结果表明所提策略能有效降低连续换相失败次数，加快故障恢复，提高输电可靠性。 |
| 关键词: 受端分层 特高压直流 换相失败 自动再启动 故障实时检测 故障恢复 分层隔离 |
| DOI：10.19783/j.cnki.pspc.190258 |
| 投稿时间：2019-03-10修订日期：2019-04-28 |
| 基金项目:国家重点研发计划项目资助(2018YFB0904700) |
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| Commutation failure control and recovery strategy of UHVDCwith hierarchical connection mode |
| WANG Sichao,WEN Jun,HE Dongshan,GENG Xiaohong,TAN Meng,HAN Minxiao |
| (School of Electrical & Electronic Engineering, North China Electric Power University, Beijing 102206, China;State Key Laboratory of Advanced Power Transmission Technology, Global Energy Interconnection Research Institute, Beijing 102209, China) |
| Abstract: |
| The commutation failure of the valve group will happen in the hierarchy where the single voltage level of Alternative Current (AC) system fails. It will also happen in another hierarchy in Ultra-High Voltage Direct Current (UHVDC) transmission project with hierarchical connection. The interaction between hierarchies of AC and DC system will also lead to successive and multiple commutation failures in the process of fault recovery. A commutation failure control and recovery strategy based on real-time fault detection and determination is presented, which can judge the fault state, the voltage level when fault occurs, and the duration of the fault. Start control strategy only when the instantaneous fault of AC system is serious. The times of automatic restart can be reduced by preventing early restart in the recovery process. The hierarchy is changed to bipolar half-voltage operation mode when serious failure occurs permanently in a single-hierarchy AC system. Based on Changji-Guquan UHVDC transmission project, a simulation model of UHVDC transmission with hierarchical connection is established in PSCAD/EMTDC. Meantime, various fault situations are set up. The results show that the proposed strategy can effectively reduce the number of successive commutation failures, accelerate fault recovery and improve transmission reliability. This work is supported by National Key Research and Development Program of China (No. 2018YFB0904700). |
| Key words: receiving-end with hierarchical connection ultra-high voltage direct current (UHVDC) commutation failure automatic restart real-time fault detection fault recovery hierarchical isolation |
