分布式新能源接入的10 kV配电网保护适应性分析

doi:10.12204/j.issn.1000-7229.2024.02.005

电力建设 ›› 2024, Vol. 45 ›› Issue (2): 49-57.doi: 10.12204/j.issn.1000-7229.2024.02.005

分布式新能源接入的10 kV配电网保护适应性分析

袁兆祥¹, 张翼², 聂铭³(), 李猛³, 和敬涵³

1.国网经济技术研究院有限公司,北京市 102209
2.国家电网有限公司,北京市 100031
3.北京交通大学电气工程学院,北京市 100044

收稿日期:2023-07-10 出版日期:2024-02-01 发布日期:2024-01-28
通讯作者: 聂铭(1996),男,博士研究生,主要从事电力系统继电保护研究,E-mail:mingnie@bjtu.edu.cn。
作者简介:袁兆祥(1970),男,博士,教授级高级工程师,主要研究方向为三维设计与数字电网等;
张翼(1975),男,硕士,教授级高级工程师,主要从事电网规划管理技术研究;
李猛(1986),男,博士,副教授,主要从事交直流电网继电保护研究;
和敬涵(1964),女,博士,教授,主要从事交直流电网继电保护研究。
基金资助:
国家电网有限公司科技项目“面向新型电力系统的配电网二次系统规划设计关键技术研究”(5400-202256273A-2-0-XG)

Protection Adaptability Analysis of Distributed Generation Connected to 10 kV Distribution Network

YUAN Zhaoxiang¹, ZHANG Yi², NIE Ming³(), LI Meng³, HE Jinghan³

1. State Grid Economic and Technological Research Institute Co., Ltd., Beijing 102209, China
2. State Grid Corporation of China, Beijing 100031, China
3. School of Electrical Engineering, Beijing Jiaotong University, Beijing 100044, China

Received:2023-07-10 Published:2024-02-01 Online:2024-01-28
Supported by:
State Grid Corporation of China Research Program(5400-202256273A-2-0-XG)

摘要/Abstract

摘要：

分布式电源(distributed generation, DG)的并网运行改变了传统单辐射式供电网络结构,同时潮流和负荷电流的双向流动影响了电力系统的安全稳定运行。针对分布式新能源接入10 kV配电网场景下的线路保护适应性进行分析,根据分布式电源接入位置不同,理论分析了新能源电源接入造成的助增电流、外汲电流、反向电流等对配电网现有保护的影响,明晰了分布式电源容量对保护性能的影响,量化了10 kV配电网保护性能边界条件,对于后续的保护配置方案以及保护新原理的研究提供理论支撑。仿真结果验证了保护适应性分析的正确性。

关键词: 分布式电源(DG), 10 kV配电网, 保护适应性, 边界条件

Abstract:

Distributed generation (DG) connected to a power network has changed the traditional single-radiation power supply network structure, while the two-way power flow and load current affect the safe and stable operation of power systems. In this study, the line protection adaptability under the scenario of DG connected to a 10 kV distribution network is analyzed. Based on the different locations of distributed generation, the effects of the infeed current, outflow current, and reverse current on the existing protection of the distribution network are analyzed theoretically. The effect of the power capacity of DG on the protection performance is clarified. Moreover, the protection performance boundary conditions of a 10 kV distribution network are quantified. This study provides theoretical support for subsequent research on protection configuration schemes and new protection principles. The simulation results verify the accuracy of the protection adaptability analysis.

Key words: distributed generation (DG), 10 kV distribution network, protection adaptability, boundary conditions

中图分类号:

TM73

袁兆祥, 张翼, 聂铭, 李猛, 和敬涵. 分布式新能源接入的10 kV配电网保护适应性分析[J]. 电力建设, 2024, 45(2): 49-57.

YUAN Zhaoxiang, ZHANG Yi, NIE Ming, LI Meng, HE Jinghan. Protection Adaptability Analysis of Distributed Generation Connected to 10 kV Distribution Network[J]. ELECTRIC POWER CONSTRUCTION, 2024, 45(2): 49-57.

图/表 17

图1 逆变型电源拓扑图

Fig.1 Topology of the inverter

图2 两电平VSC控制策略

Fig.2 Two-level VSC control strategy

图3 10 kV配电系统示意图(助增作用)

Fig.3 10 kV distribution network (infeed current)

图4 10 kV配电系统等值电路图(助增作用)

Fig.4 Equivalent circuit diagram of 10 kV distribution system (infeed current)

图5 10 kV配电系统示意图(外汲作用)

Fig.5 10 kV distribution network (out flowing current)

图6 10 kV配电系统等值电路图(外汲作用)

Fig.6 Equivalent circuit diagram of 10 kV distribution system (out flowing current)

图7 10 kV配电系统示意图(反向电流,PV-D)

Fig.7 10 kV distribution network (reverse current, PV-D)

图8 10 kV配电系统示意图(反向电流,PV-B)

Fig.8 10 kV distribution network (reverse current, PV-B)

图9 10 kV配电网仿真系统

Fig.9 Simulation system of 10 kV distribution network

表1 仿真系统参数

Table 1 Simulation system parameter

表2 阶段式电流保护整定值

Table 2 Setting values of stage current protect

图10 不接入PV时出线断路器E1仿真波形(助增作用)

Fig.10 Simulation waveform of circuit breaker E1 when PV is not connected (infeed current)

图11 接入PV时出线断路器E1仿真波形(助增作用)

Fig.11 Simulation waveform of circuit breaker E1 when PV is connected (infeed current)

图12 不接入PV时出线断路器E1仿真波形(外汲电流)

Fig.12 Simulation waveform of circuit breaker E1 when PV is not connected (out flowing current)

图13 接入PV时出线断路器E1仿真波形(外汲电流)

Fig.13 Simulation waveform of circuit breaker E1 when PV is connected (out flowing current)

图14 接入PV时出线断路器E3仿真波形

Fig.14 Simulation waveform of circuit breaker E3 when PV is connected

图15 出线断路器E1仿真波形

Fig.15 Simulation waveform of circuit breaker E1

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分布式新能源接入的10 kV配电网保护适应性分析

Protection Adaptability Analysis of Distributed Generation Connected to 10 kV Distribution Network

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