考虑水电外送及负荷中心功能属性的区域电网规划方法

doi:10.12096/j.2096-4528.pgt.20119

摘要/Abstract

摘要：

随着我国电力事业的迅速发展，我国的电网网架结构趋于复杂化。为促进网架结构的进一步优化，通过对实际电网的分析，提出电网具有水电外送、负荷中心这2个功能属性。针对不同功能属性的特性，提出一种考虑经济性、水电外送、负荷中心功能属性的区域电网规划方法，包含线路建设费用、线路运行费用、水电外送盈利、系统阻塞系数、短路电流罚函数等目标函数及相关约束条件。利用MATLAB和PSD-BPA联合仿真求解的方法，对具有高属性水电外送、中属性负荷中心的某区域电网进行实例分析，结果表明，考虑功能属性优化模型的网架结构指标更优，能有效促进水电外送消纳、降低负荷中心短路电流水平。

关键词: 电网规划, 功能属性, 水电外送, 负荷中心

Abstract:

With the rapid development of China's power industry, the power grid structure tends to be complicated. In order to further optimize the grid structure, through the analysis of the actual grid, this paper proposed that the power grid had two functional attributes of hydropower transmission and load center. According to the characteristics of different functional attributes, a regional power grid planning method was proposed, which considered economy, hydropower transmission and load center functional attributes. It included objective functions and related constraints such as line construction cost, line operation cost, hydropower transmission profit, system blocking coefficient, and short-circuit current penalty function. MATLAB and PSD-BPA joint simulation method were used to analyze a regional power grid with high-attributed hydropower transmission and medium-attributed load center. The results show that the grid structure index of the optimization model considering the functional attribute is better, which can effectively promote the consumption of hydropower transmission and reduce the short-circuit current level of the load center.

Key words: power grid planning, functional property, hydropower transmission, load center

中图分类号:

张童彦, 唐飞, 廖清芬, 高鑫. 考虑水电外送及负荷中心功能属性的区域电网规划方法[J]. 发电技术, 2021, 42(6): 741-750.

Tongyan ZHANG, Fei TANG, Qingfen LIAO, Xin GAO. Regional Power Grid Planning Method Considering Hydropower Transmission and Load Center Function Properties[J]. Power Generation Technology, 2021, 42(6): 741-750.

图/表 8

表1 地级市实际电网与水电外送、负荷中心功能属性电网关联度分类

Tab. 1 Classification of correlation between actual power grid of prefecture level city, and power grid of hydropower transmission or load center

级别	水电外送型电网水电装机容量/GW	负荷中心型电网最大负荷/GW
高	> 5	> 10
较高	> 3	> 5
中	> 2	> 3
较低	> 0.5	> 1
低	< 0.5	< 1

图1 水电群外送网架结构模型

Fig.1 Structural model of transmission grid of Hydropower Group

图2 MATLAB+PSD-BPA联合仿真方法计算流程图

Fig.2 Joint simulation solution of MATLAB+PSD-BPA

图3 YC电网仅考虑经济性的220 kV及以上初始网架

Fig.3 Initial grid frame of YC power grid only considering economy (above 220 kV)

图4 YC电网考虑经济性和水电外送、负荷中心功能属性的220 kV及以上优化网架

Fig.4 Optimal grid frame of YC power grid considering economy, hydropower transmission and load center function (above 220 kV)

表2 网架结构优化方案

Tab. 2 Optimization scheme of grid structure

线路	电压等级
线路	500 kV	220 kV
新增线路	SX—LQ(1) SJ—AF(1) YD—CL(1) SJ—GS(1) LQ—DL(1)	GHY—CY(1) CY—GJ(1) SH—HJ(1) JM—DD(1) AF—RC(1) LZ—SN(1) GH—CY(1) AF—GJ(1) AF—ZJ(1)
开断线路	—	GJ—GT(2) GJ—DJ(1) CB—ZH(1)

图5 优化后YC电网网架分区图

Fig.5 Zoning diagram of YC power grid after optimization

表3 初始网架和优化后网架对比分析

Tab. 3 Comparative analysis of initial grid and optimized grid

目标函数	初始网架	优化后网架
水电外送电量/(GW·h)	62 468	68 064
短路电流较高区域降低裕度/%	—	3.56

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