| 引用本文: | 曹斌,原帅,苗丽芳,等.新能源集中接入开闭站经同塔双回线路送出零序电流事故再现与分析[J].电力系统保护与控制,2019,47(15):133-141. |
| CAO Bin,YUAN Shuai,MIAO Lifang,et al.Analysis of zero sequence current accident of double circuit transmission lines on the same tower with large scale new energy integration to switch station[J].Power System Protection and Control,2019,47(15):133-141 |
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| 摘要: |
| 随着大规模新能源并入电网，很多地区采用新能源集中接入开闭站，再通过同塔双回输电线路送出的电网结构，然而运行中存在零序保护动作、跳闸事故频发现象。以电网实际故障实例，基于PSCAD软件，针对大规模新能源集中接入开闭站经220 kV同塔双回输电线路送出的网架精确建模，实现了电磁暂态故障再现仿真。深入分析了跳闸事故原因，找出了零序电流来源，并创新性地针对220 kV开闭站升压为500 kV电站后的电网零序电流进行对比分析，提出了零序保护定值与升压改造的解决方案。该方案为上述新能源集中送出的电网结构零序电流的来源与防护提供了完好的措施，为相关电网的设计、运行与保护定值设置提供了切实可行的方案。 |
| 关键词: 零序电流 故障再现电磁暂态仿真 同塔双回输电线路 新能源汇集 跳闸事故 |
| DOI：10.7667/PSPC20191518 |
| 分类号: |
| 基金项目:国家重点研发计划项目资助(2016YFB0900105) |
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| Analysis of zero sequence current accident of double circuit transmission lines on the same tower with large scale new energy integration to switch station |
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CAO Bin1,YUAN Shuai1,MIAO Lifang1,LI Xiangxin2,3
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(1. Inner Mongolia Electric Power Research Institute, Hohhot 010020, China;2. School of Electrical and Electronic Engineering, North China Electric Power University, Beijing 102206, China;3. North China Dispatching & Control Center Branch, State Grid Corporation of China, Beijing 100053, China)
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| Abstract: |
| As the massive new energy coming into the grid, the large-scale new energy centralized access to switching station in many districts, the structure of double-circuit transmission lines on the same tower is adopted. There are zero sequence protection actions in operation and frequent trip accidents. This paper takes the actual fault of the power grid as an example. Based on the PSCAD software, the network frame sent by 220 kV double-circuit transmission lines on the same tower of large-scale new energy centralized access to switching station is modeled accurately. The electromagnetic transient simulation of fault recurrence is realized. The causes of trip accidents are analyzed in depth. The source of zero-sequence current is found. In addition, it innovatively compares and analyzes the zero sequence current of the power grid after the 220 kV open-close station is boosted to 500 kV power station. The solution of zero sequence protection fixed value and boost transformation is proposed. A good measure is proposed for the source and protection of zero-sequence current in power grid structure sent by new energy, which provides a feasible scheme for the design, operation and protection setting of power grid. This work is supported by National Key Research and Development Program of China (No. 2016YFB0900105). |
| Key words: zero sequence current electromagnetic transient simulation of fault recurrence double-circuit transmission lines on the same tower new energy collection trip accident |
