Regional Power Grid Planning Method Considering Hydropower Transmission and Load Center Function Properties

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

Abstract

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

CLC Number:

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.

Figures/Tables 8

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

Fig.1 Structural model of transmission grid of Hydropower Group

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

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

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

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)

Fig.5 Zoning diagram of YC power grid after optimization

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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