| 引用本文: | 樊艳芳,耿山,巩晓玲,等.基于直流偏磁风险指标的变电站选址[J].电力系统保护与控制,2018,46(19):59-65. |
| FAN Yanfang,GENG Shan,GONG Xiaoling,et al.Substation site selection considering the risk index of DC bias[J].Power System Protection and Control,2018,46(19):59-65 |
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| 摘要: |
| 以哈密-郑州±800 kV特高压直流(UHVDC)工程为背景，为使UHVDC接地极周边的交流变电站尽可能在设计之初免受直流偏磁干扰的危害，提出了基于直流偏磁风险指标对变电站选址。在复合高山土壤模型下考虑交流变电站极间耦合电阻计算直流电流分布，进一步选择正常、过流站点。在此基础上结合单、双UHVDC接地极的感应电势分布，分别建立等势线。依据电力系统的经济性采取就近原则:对于正常站点周边的新建站点应建在等势线上；对于过流站点周边的新建站点应与等势线径向分布，并以增大电势差为依据，适当地增加过流站点出线数量，在最大程度上规避直流偏磁风险。 |
| 关键词: 特高压直流接地极 耦合电阻 直流偏磁风险 变电站选址 等势线 |
| DOI：10.7667/PSPC171287 |
| 分类号: |
| 基金项目:国家自然科学基金项目资助(51767023) |
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| Substation site selection considering the risk index of DC bias |
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FAN Yanfang1,GENG Shan2,GONG Xiaoling3,LI Ziqian4
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(1. School of Electrical Engineering, Xinjiang University, Urumqi 830047, China;2. Handan Power Supply Company, State Grid Hebei Electric Power Company, Handan 056000, China;3. Changji Power Supply Company, State Grid Xinjiang Electric Power Company, Changji 831100, China;4. Pingliang Power Supply Company, State Grid Gansu Electric Power Company, Pingliang 744000, China)
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| Abstract: |
| Taking Hami Zhengzhou ±800 kV Ultra High Voltage Direct Current (UHVDC) project as background, in order to make AC substations in the vicinity of UHVDC grounding poles avoid the harm of DC bias interference at the beginning of the design, the location of substation taking into account DC bias risk index is proposed. Considering the substation AC coupling resistance, the DC current distribution is calculated under the complex alpine soil model. The normal and over current stations are further selected. On this basis, the equipotential lines are established respectively based on the induced potential distribution of single and double UHVDC grounding electrodes. According to the economy of the power system, the nearest principle is adopted:new sites around the normal site should be built on the equipotential line; the new sites around the over-current site should be radially distributed with equipotential lines, on the basis of increasing potential difference, appropriate flow outlet site number is increased to avoid the risk of DC bias at the maximum extent. This work is supported by National Natural Science Foundation of China (No.51767023). |
| Key words: UHVDC grounding electrode coupling resistance DC bias risk substation location equipotential line |
