| 引用本文: | 许朋见,黄金海,许静静,等.宾金特高压直流换相失败保护的研究[J].电力系统保护与控制,2017,45(2):140-146.[点击复制] |
| XU Pengjian,HUANG Jinhai,XU Jingjing,et al.Study of Bin-Jin UHVDC project commutation failures protection[J].Power System Protection and Control,2017,45(2):140-146[点击复制] |
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| 摘要: |
| 随着特高压直流输送容量的增大，换相失败所造成的功率波动越来越严重，可能会引起交流电网失步的严重后果，这已经成为换相失败保护动作的重要外部约束条件。通过对宾金直流换相失败进行分析，得到交流系统对换相失败引起的直流功率跌落次数和故障持续时间的承受能力。之后分析了原有换相失败保护的原理、判据以及动作策略，针对不满足交流系统承受能力的连续换相失败故障提出了增加双极换相失败加速段保护的优化方案，并给出了保护判据、逻辑时序、定值延时及动作策略。最后，对提出的双极换相失败加速段保护设计了相应软件程序，在与实际工程一致的控制保护仿真试验平台上进行了仿真试验，验证了新方案的可行性和可靠性。优化方案已成功应用于宾金特高压直流输电工程。 |
| 关键词: 特高压直流 连续换相失败 双极换相失败保护 交流系统 冲击 |
| DOI：10.7667/PSPC160087 |
| 投稿时间：2016-01-15修订日期：2016-06-14 |
| 基金项目: |
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| Study of Bin-Jin UHVDC project commutation failures protection |
| XU Pengjian,HUANG Jinhai,XU Jingjing,FU Yan,FAN Ziqiang,ZHOU Xiaofeng |
| (XJ Electric Co., Ltd., Xuchang 461000, China) |
| Abstract: |
| With the increase of the UHVDC capacity, the power fluctuations caused by commutation failures become more serious and probably induce out of step of AC grid which becomes an important external constraint condition of the commutation failure protection. This paper gets the ability of AC power grid to bear the number of DC power dropping and the fault duration time caused by commutation failures through DC commutation failure analysis firstly. Then the principle, criterion and action strategy of original commutation failure protection are introduced. Against the continuous commutation failures not meeting AC system tolerance capacity, an optimal scheme that adds double-pole commutation failure acceleration protection is proposed and the protection criterion, logic time sequence, setting values delay, and action strategy are given. Finally, the relevant software program of the proposed protection is written, and simulation experiments are done on the control and protection platform in line with real engineering which confirms the feasibility and reliability of the new scheme. The optimization scheme has been applied in the UHVDC transmission project from Yibin to Jinhua successfully. |
| Key words: UHVDC continuous commutation failure double pole commutation failure protection AC system shock |
