| 引用本文: | 边宏宇,徐友平,邵德军,等.直流馈入受端电网“空心化”形势下的稳定特性分析及解决措施[J].电力系统保护与控制,2020,48(18):164-170.[点击复制] |
| BIAN Hongyu,XU Youping,SHAO Dejun,et al.Analysis of stability characteristics and solutions with the hollowing of a DC feed power grid[J].Power System Protection and Control,2020,48(18):164-170[点击复制] |
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| 摘要: |
| 随着国家对“西电东送”战略逐步重视以及清洁能源大范围优化配置能力的持续提升，特高压多直流馈入后替代受端电网常规电源而导致受端“空心化”趋势可能成为一个较为普遍的问题。主要以青豫直流馈入河南及华中电网为例，分析了直流馈入受端电网后的潮流疏散、电压稳定、功角稳定、小干扰动态稳定及多馈入短路比等主要特性变化。计算结果表明，直流工程可有效提升受端电网供电能力及电力互济能力，但直流落点近区可能存在潮流疏散不均衡、暂态电压、功角及系统动态稳定性降低，及现有跨区直流多馈入有效短路比降低等问题。针对上述问题提出合理安排运行方式及受端交流网架加强工程与直流工程同步的建议，并验证了建议的有效性。研究结果对规划、运行及国内同类直流工程设计都具有较强的参考价值。 |
| 关键词: 特高压直流 电网空心化 电压稳定 功角稳定 多馈入短路比 |
| DOI：DOI: 10.19783/j.cnki.pspc.191340 |
| 投稿时间：2019-10-28修订日期：2020-02-13 |
| 基金项目:国家电网有限公司科技项目资助(521700190010)“电化学储能电站群在特高压交直流混联受端电网应用关键技术研究及示范” |
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| Analysis of stability characteristics and solutions with the hollowing of a DC feed power grid |
| BIAN Hongyu,XU Youping,SHAO Dejun,PAN Xiaojie,DANG Jie,LI Chenghao |
| (1. Central China Branch, State Grid Corporation of China, Wuhan 430077, China;
2. State Grid Henan Electric Power Research Institute, Zhengzhou 450052, China) |
| Abstract: |
| With increasing attention being paid to the national strategy of "west-to-east power transmission" and the continuous improvement of the wide-ranging and optimal allocation of clean energy, it will become a common problem for multi-DC to replace the conventional power supply. This will bring about the terminal hollowing of the power grid. This paper mainly takes the Henan power grid and central China power grid as examples to analyze the main characteristics of power flow evacuation, voltage stability, power angle stability, small disturbance stability and multi-feed short-circuit ratio. As the results show, after the above projects are put into operation, the power supply capacity of the receiving grid and the flexibility of the mutual aid between different areas can be greatly improved. However, there may be some problems such as the imbalance of power flow evacuation, the decrease of transient voltage, power angle and system dynamic stability, and the decrease of the effective short-circuit ratio of the DC multi-feed across the region. In view of the above problems, this paper puts forward some suggestions on how to arrange the operation mode reasonably and strengthen the synchronization between the AC grid and the DC project, and the effectiveness of the proposal is also verified. This study could be referred to for power grid planning, power grid operation and other similar HVDC transmission projects.
This work is supported by Science and Technology Project of State Grid Corporation of China (No. 521700190010) “Study and Demonstration of Application Key Technologies of Electrochemical Energy Storage Power Plant Clusters in UHV AC/DC Hybrid Receiving-end Power Grid”. |
| Key words: UHVDC hollowing of power grid voltage stability power angle stability multi-feed short circuit ratio |
