| 引用本文: | 郝梦竹,王青,李文启,等.不同直流闭锁故障对弱交流联络线功率波动影响机制[J].电力系统保护与控制,2018,46(19):88-94.[点击复制] |
| HAO Mengzhu,WANG Qing,LI Wenqi,et al.Power fluctuation influence mechanism of weak AC tie-line caused by different DC block[J].Power System Protection and Control,2018,46(19):88-94[点击复制] |
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| 不同直流闭锁故障对弱交流联络线功率波动影响机制 |
| 郝梦竹,王青,李文启,李轶群,赵冬梅,宋云亭 |
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| (华北电力大学, 北京 102206;中国电力科学研究院有限公司电网安全与节能国家重点实验室, 北京 100192;国网河南省电力公司, 河南 郑州 450052;国家电网公司华北分部, 北京 100053) |
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| 摘要: |
| 直流闭锁故障冲击弱交流联络线是我国特高压交直流电网面临的现实问题。随着直流工程投产数量增多，位于电网不同位置的直流发生故障，对弱交流联络线功率波动的影响特性日益受到重视。以华北电网的锡泰直流、晋南直流分别闭锁为典型研究场景，将华北—华中联络线功率变化量分解为大区间振荡模式分量和省间振荡模式分量,并给出了两类模式分量受直流位置影响的机制。通过理论推导和仿真分析发现，大区间振荡模式分量的峰值随故障直流与联络线之间电气距离的增大而增大。省间振荡模式分量在不同直流故障下的相位差等于强相关机组在不同直流故障下功率变化量的相位差。由于锡泰直流、晋南直流位于相对振荡机群近区，导致两条直流分别故障时省间振荡模式分量存在反相规律，引起联络线功率峰值大小及其发生时刻的偏移现象。 |
| 关键词: 交直流耦合 联络线 功率波动 振荡模式 |
| DOI：10.7667/PSPC171328 |
| 投稿时间：2017-09-05修订日期：2017-11-13 |
| 基金项目:国家电网公司科技项目资助“多点布局分布式储能系统在电网的聚合效应研究及应用示范” |
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| Power fluctuation influence mechanism of weak AC tie-line caused by different DC block |
| HAO Mengzhu,WANG Qing,LI Wenqi,LI Yiqun,ZHAO Dongmei,SONG Yunting |
| (North China Electric Power University, Beijing 102206, China;China Electric Power Research Institute State Key Laboratory of Power Grid Safety and Energy Conservation, Beijing 100192, China;State Grid Henan Electric Power Company, Zhengzhou 450052, China;North China Branch of State Grid Corporation of China, Beijing 100053, China) |
| Abstract: |
| The weak AC tie-line power fluctuation caused by DC block is a realistic problem affecting the safety of UHV AC/DC power grid in China. With more and more DC projects put into operation, the importance of the study on power fluctuation influence mechanism of weak AC tie-line caused by different DC block is recognized. Taking Xitai DC block and Jinnan DC block in North China Power Grid as the typical study case, weak tie-line power fluctuation mechanism is analyzed through decomposing the tie-line power variation into inter-area oscillation mode component and inter-provincial oscillation mode component. Based on theoretical derivation and simulation analysis, it is found that the peak value of inter-area oscillation mode component of tie-line power increases with the increment of electrical distance from faulty DC location to tie-line location. Moreover, important principle of inter-provincial oscillation mode component of tie-line power is obtained by using generalized phasor method. The phase variable quantity of the inter-provincial mode component of tie-line power with the change of faulty DC location is equal to the phase variable quantity of strongly correlated generator defined by power system small signal analysis. The locations of Xitai DC and Jinnan DC are very special, which are near the relative oscillation generator groups concerned with inter-provincial oscillation mode. Thus, the phases of the inter-provincial mode component of tie-line power are opposite to each other for different DC block, which leads to the change of tie-line power peak value and occurrence time. This work is supported by Science and Technology of State Grid Corporation of China “Research and Application Demonstration of Aggregation Effect of Multi-point Layout Distributed Energy Storage System in Power Grid”. |
| Key words: AC and DC coupling tie-line power fluctuation oscillation mode |
