| 引用本文: | 宋国兵,常娜娜,侯俊杰,等.基于系统电压分布曲线拟合的后备保护方案[J].电力系统保护与控制,2022,50(16):95-104.[点击复制] |
| SONG Guobing,CHANG Nana,HOU Junjie,et al.Backup protection scheme based on system voltage distribution using curve fitting[J].Power System Protection and Control,2022,50(16):95-104[点击复制] |
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| 摘要: |
| 拓扑结构的多样性和电源特性的复杂性使得基于稳态电流量的后备保护整定工作量大且失配现象时有发生，无需整定且具有自动配合功能的后备保护技术是继电保护工作人员追求的目标。在分析了传统反时限过流保护存在的问题和辐射状配电网正、负序电压故障分量分布特征的基础上，提出了基于系统电压分布曲线拟合的后备保护方案。所提方案利用综合电压序分量的系统分布与各级保护实现逐级配合的最小动作时间拟合具有反时限特性的动作曲线，得出拟合后的分段函数表达式。由其计算的保护动作时间可自动反映各保护与故障位置的拓扑关联关系，在满足选择性和快速性要求的前提下实现各级保护的自适应配合。DG接入不会改变综合电压序分量的分布特征，因而所提方法对含DG的网络具有自适应性。理论分析和仿真结果表明，所提方法可自动实现任一点故障时上下级保护的快速、逐级配合。 |
| 关键词: 后备保护 综合电压序分量 曲线拟合 自适应配合 DG接入 |
| DOI：DOI: 10.19783/j.cnki.pspc.211394 |
| 投稿时间：2021-10-05修订日期：2021-11-16 |
| 基金项目:国家电网有限公司科技项目资助(5100- 202040327A-0-0-00) |
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| Backup protection scheme based on system voltage distribution using curve fitting |
| SONG Guobing,CHANG Nana,HOU Junjie,CHANG Zhongxue,ZHENG Yuping,WU Tonghua |
| (1. School of Electrical Engineering, Xi'an Jiaotong University, Xi'an 710049, China; 2. State Key Laboratory of Electrical Insulation
and Power Equipment (Xi'an Jiaotong University), Xi'an 710049, China; 3. NARI Group (State Grid Electric Power Research Institute)
Corporation, Nanjing 211106, China; 4. State Key Laboratory of Smart Grid Protection and Control, Nanjing 211106, China) |
| Abstract: |
| The diversity of topologies and the complexity of power supply characteristics make the setting workload of backup protection based on steady-state current large and a mismatch occurs from time to time. Backup protection technology without setting and with an automatic coordination function is the goal of relay protection workers. Based on the analysis of the problems of traditional inverse-time overcurrent (ITOC) protection and the distribution characteristics of positive and negative sequence voltage fault components in a radial distribution network, a backup protection scheme using curve fitting based on system voltage distribution is proposed. The proposed scheme uses the system distribution of compound voltage sequence components and the minimum action time of step-by-step coordination between all protections to fit the action curve with inverse-time characteristics, and obtains the fitted piece-wise function expression. The calculated protection action time can automatically reflect the topological relationship between each protection and fault location, and realize the adaptive coordination of all protections and meet the requirements of selectivity and rapidity. DG access does not change the distribution characteristics of the compound voltage sequence component, so the proposed method is adaptive to the network with DG. Theoretical analysis and simulation results show that the proposed method can automatically realize the fast and step-by-step coordination of upstream and downstream protections in the case of any point fault.
This work is supported by the Science and Technology of State Grid Corporation of China (No. 5100-202040327A-0-0-00). |
| Key words: backup protection compound voltage sequence component curve fitting adaptive coordination DG access |
