| 引用本文: | 李振兴,望周丽,刘颖彤,等.基于整形变换降容的电流差动保护原理与实现[J].电力系统保护与控制,2022,50(2):77-85.[点击复制] |
| LI Zhenxing,WANG Zhouli,LIU Yingtong,et al.Principle and realization of current differential protection based on shaping transformation and capacity reduction[J].Power System Protection and Control,2022,50(2):77-85[点击复制] |
|
| 摘要: |
| 电流差动保护因速动性好、灵敏度高成为广域继电保护的研究热点，但广域电流差动保护的实施使得设备间纵联通信流量骤增，严重影响了保护性能。基于此，提出一种基于整形变换降容的电流差动保护原理。该原理将多字节浮点型电流模值和电流相位基于单字节整形变换，交换变换信息可以大幅降低通信量；无需解码直接进行差动电流和制动电流计算，构建新的差动保护判据。另外，提出了整形变换原则，分析了改进差动保护的灵敏度，计算变换后的降容率。通过PSCAD数字仿真和动态模拟实验对保护判据进行验证，结果表明该原理能够可靠识别区内外故障，并具有较高的灵敏度。 |
| 关键词: 电流差动保护 整形变换 通信降容 降容率 灵敏度 |
| DOI：DOI: 10.19783/j.cnki.pspc.210372 |
| 投稿时间：2021-04-08修订日期：2021-06-18 |
| 基金项目:国家自然科学基金项目资助(52077120) |
|
| Principle and realization of current differential protection based on shaping transformation and capacity reduction |
| LI Zhenxing,WANG Zhouli,LIU Yingtong,SHE Shuangxi,TAN Chao,WENG Hanli |
| (1. Hubei Engineering Research Center for Smart Energy Technology, China Three Gorges University, Yichang 443002, China;
2. College of Electrical Engineering and New Energy, China Three Gorges University, Yichang 443002, China;
3. State Grid Hubei Electric Power Company Maintenance Company, Wuhan 430014, China;
4. State Grid Yichang Electric Power Supply Company, Yichang 443002, China) |
| Abstract: |
| Current differential protection has become a research hotspot in wide-area relay protection because of its fast action and high sensitivity. However, the implementation of wide-area current differential protection has caused a sudden increase in the longitudinal communication traffic between devices. This seriously affects protection performance. This paper proposes a current differential protection principle based on shaping transformation and capacity reduction. This principle transforms the current modulus and current phase of the multi-byte floating point based on single-byte shaping, and the exchange of transformed information can greatly reduce the amount of communication. The differential and braking current are directly calculated without decoding, and a new differential protection criterion is constructed. In addition, the principle of shaping transformation is proposed, the sensitivity of the improved differential protection is analyzed, and the derating rate after transformation is calculated. The protection criterion is verified by PSCAD digital simulation and a dynamic simulation experiment. The results show that this principle can reliably identify the faults inside and outside the area, and has high sensitivity.
This work is supported by the National Natural Science Foundation of China (No. 52077120). |
| Key words: current differential protection shaping transformation communication derating derating rate sensitivity |
