多应用场景低压配网无缝合环转电解决方案

doi:10.12204/j.issn.1000-7229.2022.07.013

电力建设 ›› 2022, Vol. 43 ›› Issue (7): 113-120.doi: 10.12204/j.issn.1000-7229.2022.07.013

多应用场景低压配网无缝合环转电解决方案

李俊林¹, 韩捷¹, 谢聪²(), 刘晓¹, 张旭¹, 王丹²

1.广东电网有限责任公司广州供电局, 广州市 510620
2.华中科技大学电气与电子工程学院, 武汉市 430074

收稿日期:2021-12-30 出版日期:2022-07-01 发布日期:2022-06-30
通讯作者: 谢聪 E-mail:jacobxcg@qq.com
作者简介:李俊林(1991),男,硕士,工程师,研究方向为配网规划、运维;
韩捷(1983),男,本科,高级工程师,研究方向为配网管理;
刘晓(1987),男,本科,工程师,研究方向为配网管理;
张旭(1988),女,硕士,工程师,研究方向为配网可靠性管理;
王丹(1977),男,博士,教授,博士生导师,研究方向为大功率电力电子技术在电力系统中的应用。
基金资助:
南方电网公司科技项目(08200KK5219004)

Solutions for Seamless Closed-Loop Load Transfer of Low-Voltage Distribution Network in Multiple Application Scenarios

LI Junlin¹, HAN Jie¹, XIE Cong²(), LIU Xiao¹, ZHANG Xu¹, WANG Dan²

1. Guangzhou Power Supply Co., Ltd., Guangzhou 510620, China
2. School of Electrical and Electronic Engineering,Huazhong University of Science and Technology, Wuhan 430074, China

Received:2021-12-30 Online:2022-07-01 Published:2022-06-30
Contact: XIE Cong E-mail:jacobxcg@qq.com
Supported by:
Science and Technology Project of China Southern Power Grid Corporation(08200KK5219004)

摘要/Abstract

摘要：

合环转电作为一种重要的网络重构技术,对提高配电网运行的可靠性与经济性具有重要意义。常规合环转电不仅存在合环冲击,而且合环点的选取受到两侧电源相角差的限制。文章针对广州配电网存在的大角度差不停电转供技术难题,提出两种无缝合环转电解决方案,分别是基于串并联补偿的合环方案和基于背靠背拓扑的合环方案。它们能够适用于多种转供场景,并提供交、直流两种转供电源接口。文章给出了每种方案的接线方式,对它们的结构特点、性能参数以及工作原理进行了分析。为了适应配电网三相不平衡与谐波污染的运行环境,从结构与控制两方面提出了装置的改进措施。最后,仿真验证了几种典型场景下无缝合环转电装置的运行原理,从而为实际开展低压无缝合环转电提供计算支撑。

关键词: 合环转电, 低压配网, 不停电转供, 供电可靠性

Abstract:

As an important network reconfiguration technology, the closed-loop load transfer (CLLT) is of great significance to improve the reliability and economic efficiency of the distribution network. The conventional CLLT has a loop closing impact and the selection of loop closing point is limited by the phase angle difference between two substations. In this paper, two solutions are proposed to solve the technical problems of CLLT with the large angle difference in the Guangzhou distribution network, which are based on series-parallel compensation and back-to-back topology, respectively. They can be applied to a variety of scenarios and provide AC and DC interfaces. The wiring modes of these schemes are given, and their structural characteristics, performance parameters, and operating principles are analyzed. To adapt to the condition of three-phase imbalance and harmonic pollution, the improvement measures of the two schemes are proposed from the structure and control perspective. Finally, the operating principle of the seamless CLLT device in several typical scenarios is verified by simulation, thus providing computational support for the actual development of seamless CLLT.

Key words: closed-loop load transfer, low-voltage distribution network, uninterrupted power supply, power supply reliability

中图分类号:

TM72

李俊林, 韩捷, 谢聪, 刘晓, 张旭, 王丹. 多应用场景低压配网无缝合环转电解决方案[J]. 电力建设, 2022, 43(7): 113-120.

LI Junlin, HAN Jie, XIE Cong, LIU Xiao, ZHANG Xu, WANG Dan. Solutions for Seamless Closed-Loop Load Transfer of Low-Voltage Distribution Network in Multiple Application Scenarios[J]. ELECTRIC POWER CONSTRUCTION, 2022, 43(7): 113-120.

图/表 10

图1 典型转供场景

Fig.1 Typical load transfer scenarios

图2 基本合环方式

Fig.2 Basic loop closing modes

图3 UPQC型无缝合环转电装置拓扑结构

Fig.3 Topology of seamless closed-loop load transfer based on UPQC structure

图4 VSC的拓扑结构

Fig.4 Schematic structure of a VSC

图5 背靠背型无缝合环转电装置拓扑结构

Fig.5 Topology of seamless closed-loop load transfer based on back-to-back structure

图6 UPQC型拓扑稳态等效电路

Fig.6 Steady-state equivalent circuit of the topology based on UPQC

图7 两种拓扑的容量与相角差的关系

Fig.7 Relationship between capacity and phase angle difference of two topologies

图8 工况1的仿真结果

Fig.8 Simulation results of operating condition 1

图9 工况2的仿真结果

Fig.9 Simulation results of operating condition 2

图10 移动发电车并网仿真结果

Fig.10 Simulation results of grid-connection of mobile generator

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多应用场景低压配网无缝合环转电解决方案

Solutions for Seamless Closed-Loop Load Transfer of Low-Voltage Distribution Network in Multiple Application Scenarios

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