| 引用本文: | 李仲青,曹虹,张和,等.500 kV UPFC对工频变化量方向保护的影响分析[J].电力系统保护与控制,2018,46(22):55-63.[点击复制] |
| LI Zhongqing,CAO Hong,ZHANG He,et al.Analysis of the impact of 500 kV UPFC on impedance directional protection based on variation[J].Power System Protection and Control,2018,46(22):55-63[点击复制] |
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| 摘要: |
| 作为灵活交流输电系统(FACTS)的典型应用之一，统一潮流控制器(UPFC)可对线路的有功和无功潮流进行快速调节。考虑UPFC保护系统在交流线路故障后可快速将UPFC从系统中隔离，在UPFC安装处形成功率变化量源，从而对工频变化量方向保护造成影响。以国内某实际500 kV UPFC工程为依托，介绍了UPFC的工作原理及其保护系统设计，依据工频变化量方向保护的动作原理，以UPFC本侧保护为例，定量分析了正反向故障时的工频变化量阻抗特征。正方向故障时，工频变化量阻抗仍近似反映为系统阻抗与线路阻抗之和的相反数，工频变化量保护可靠动作。反方向故障时，故障后测量电压跌落至0.917 p.u.以下是工频变化量方向保护可靠不误动的充分不必要条件，而电压变化量补偿系数λ的实部小于-1是工频变化量方向保护误动的充分必要条件。进一步地，也提出了相邻线路保护的电压变化量补偿系数λ以及定量分析结果。RTDS仿真结果验证了理论分析的有效性和准确性。 |
| 关键词: 统一潮流控制器 工频变化量方向保护 定量分析 测量电压 电压变化量补偿系数 |
| DOI：10.7667/PSPC171607 |
| 投稿时间：2017-10-31修订日期：2018-02-08 |
| 基金项目:国家重点研发计划项目课题资助(2016YFB0900604) |
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| Analysis of the impact of 500 kV UPFC on impedance directional protection based on variation |
| LI Zhongqing,CAO Hong,ZHANG He,JIAN Chaohui |
| (State Key Laboratory for Security and Energy Saving China Electric Power Research Institute, Beijing 100192, China;State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China;Power China Guizhou Engineering Co., Ltd., Guiyang 550007, China) |
| Abstract: |
| As the typical representative of FACTS controllers, UPFC rapidly adjusts active and reactive power flow. Protections of UPFC would trip to isolate the UPFC from system quickly when fault occurs in the power grid. It would form power variation source located at the installation of UPFC, which has influence on impedance directional protection based on variation. In this paper, taking a domestic 500 kV UPFC project as the basis, the principle and protection system of UPFC are proposed. The principle of impedance directional protection based on variation is introduced. Quantitative analysis of the characteristics of power-frequency variation impedance calculated by the relay located at the UPFC side of line is carried out. During forward faults, power-frequency variation impedance is approximately equal to the inverse of the sum of system impedance and line impedance, directional protection could operate reliably. During reverse faults, once fault measuring voltage drops below 0.917 p.u., directional protection would not operate reliably; the real part of voltage variation compensation factor λ below -1 is the sufficient and necessary condition of protection malfunction. Furthermore, quantitative analysis results and λ of adjacent line protections are given. RTDS simulation tests verify the validity and accuracy of the theoretical analysis. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900604). |
| Key words: unified power flow controller (UPFC) impedance directional protection based on variation quantitative analysis measuring voltage voltage variation compensation factor |
