考虑分布式光伏电源接入模式的低压配电网不平衡线损计算方法

doi:10.12204/j.issn.1000-7229.2021.10.014

电力建设 ›› 2021, Vol. 42 ›› Issue (10): 129-138.doi: 10.12204/j.issn.1000-7229.2021.10.014

考虑分布式光伏电源接入模式的低压配电网不平衡线损计算方法

刘科研¹, 贾东梨¹, 王薇嘉², 耿光飞²(), 魏琛豪²

1.中国电力科学研究院有限公司,北京市 100192
2.中国农业大学信息与电气工程学院, 北京市 100083

收稿日期:2020-12-23 出版日期:2021-10-01 发布日期:2021-10-09
通讯作者: 耿光飞 E-mail:guangfei@cau.edu.cn
作者简介:刘科研(1978),男,博士,教授级高级工程师,研究方向为配电网建模仿真与智能分析。
贾东梨(1982),女,硕士,教授级高级工程师,研究方向为智能电网运行技术等。
王薇嘉(1994),女,硕士研究生,研究方向为电力系统运行控制。
魏琛豪(1997),男,硕士研究生,研究方向为电力系统运行控制。
基金资助:
国家电网有限公司科技项目“基于大数据的配电网精益化线损管理技术与应用”(SGTJDK00DWJS1800014)

Calculation Method of Unbalanced Line Loss in Low-Voltage Distribution Network Considering the Access Mode of Distributed Photovoltaic Generation

LIU Keyan¹, JIA Dongli¹, WANG Weijia², GENG Guangfei²(), WEI Chenhao²

1. China Electric Power Research Institute, Beijing 100192, China
2. College of Information and Electrical Engineering, China Agriculture University, Beijing 100083, China

Received:2020-12-23 Online:2021-10-01 Published:2021-10-09
Contact: GENG Guangfei E-mail:guangfei@cau.edu.cn
Supported by:
State Grid Corporation of China Research Program(SGTJDK00DWJS1800014)

摘要/Abstract

摘要：

日益增加的户用光伏发电系统改变了配电网的潮流分布,同时对配电网的线损产生显著影响。为了便于量化分布式光伏电源(distributed photovoltaic generation,DPG)接入三相四线制低压配电网的运行经济性,文章以三相不平衡线损为研究目标,首先建立了适用于低压配电网平衡态和不平衡态的线损计算模型;通过引入DPG接入模式、位置及容量3种要素,建立DPG不同接入模式下的线损变化量模型;以此为基础,提出一种考虑DPG接入模式的有源低压配电网的三相不平衡线损计算方法。在进行计算时,所提方法既可利用实时电流数据,也可利用易采集到的有功电量数据进行计算。最后,以低压配电网的典型参数为例验证了该方法的准确性与可行性,说明此方法可为DPG单相、三相接入低压配电网的线损计算提供参考依据。

关键词: 低压配电网, 三相不平衡, 分布式光伏电源, 线路损耗

Abstract:

The increasing number of household photovoltaic power generation systems has changed the power flow distribution of the distribution network, and at the same time has a significant impact on the line loss of the distribution network. In order to quantify the operating economy of distributed photovoltaic generation (DPG) connected to the three-phase four-wire low-voltage distribution network, this paper takes the three-phase unbalanced line loss as the research objective, and firstly establishes a balanced and unbalanced line loss calculation models suitable for low-voltage distribution network. By introducing three influencing factors of DPG access mode, location and capacity, the line loss variation model under different DPG access modes is established. A model for estimating the three-phase unbalanced line loss of the active low-voltage distribution network considering the DPG access mode is proposed. This method can be calculated by using both real-time current data and easily collected active power data. The accuracy and feasibility of this method is verified by taking typical parameters of low-voltage distribution network as an example, and the method can provide reference basis for line loss calculation of DPG single-phase and three-phase access to low-voltage distribution network.

Key words: low-voltage distribution network, three-phase unbalance, distributed photovoltaic generation, line loss

中图分类号:

TM76

刘科研, 贾东梨, 王薇嘉, 耿光飞, 魏琛豪. 考虑分布式光伏电源接入模式的低压配电网不平衡线损计算方法[J]. 电力建设, 2021, 42(10): 129-138.

LIU Keyan, JIA Dongli, WANG Weijia, GENG Guangfei, WEI Chenhao. Calculation Method of Unbalanced Line Loss in Low-Voltage Distribution Network Considering the Access Mode of Distributed Photovoltaic Generation[J]. ELECTRIC POWER CONSTRUCTION, 2021, 42(10): 129-138.

图/表 8

图1 负荷均匀分布的馈线电流变化

Fig.1 Variation of feeder current with uniform load distribution

图2 DPG三相接入的平衡态配电线路电流分布

Fig.2 Current distribution of balanced distribution line with DPG three-phase connected

图3 某低压配电网拓扑图

Fig.3 Topology diagram of a low-voltage distribution network in a certain area

图4 分布式光伏接入380 V不平衡态配电网时的线损率

Fig.4 Line loss rate of distributed photovoltaic power connected to 380V unbalanced distribution network

表1 DPG三相接入平衡态和不平衡态配电网ΔP对比

Table 1 Comparison of line loss variation of balanced and unbalanced distribution network with DPG three-phase access

表2 DPG单相接入节点2时的线损率

Table 2 Rate of line loss when DPG single-phase access node 2%

表3 DPG单相接入节点5时的线损率

Table 3 Rate of line loss when DPG single-phase access node 5%

表4 DPG单相接入节点8时的线损率

Table 4 Rate of line loss when DPG single-phase access node 8%

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考虑分布式光伏电源接入模式的低压配电网不平衡线损计算方法

Calculation Method of Unbalanced Line Loss in Low-Voltage Distribution Network Considering the Access Mode of Distributed Photovoltaic Generation

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