Comprehensive Optimization of Access Point Selection for Offshore Wind Farm Integrated With Voltage Source Converter High Voltage Direct Current

doi:10.12096/j.2096-4528.pgt.22011

Abstract

Abstract:

With the large-scale development of offshore wind power, the suitable access point to power grid for offshore wind farm is more beneficial for voltage source converter high voltage direct current (VSC-HVDC) power transmission. Aiming at large scale offshore wind farm integrated by the VSC-HVDC, the evaluation indexes of wind power accommodation capability, grid voltage stability, grid-connected point vulnerability and construction cost were proposed by analyzing the main influencing factors of grid-connected. Based on the theory of information entropy and fuzzy analytic hierarchy process, a combination weighting model was established to determine the index weights, , and a comprehensive optimization method of access point selection was proposed. Simulation results of eastern Shandong power grid of China integrated with offshore wind farm demonstrate that the proposed method enhances the capability of wind power accommodation and improves the security and stability of power grid.

Key words: offshore wind power, voltage source converter high voltage direct current (VSC-HVDC), access point selection, fuzzy analytic hierarchy process, security accommodation

CLC Number:

TK 89

Xiaoming LIU, Zukuang TAN, Zhenhua YUAN, Yutian LIU. Comprehensive Optimization of Access Point Selection for Offshore Wind Farm Integrated With Voltage Source Converter High Voltage Direct Current[J]. Power Generation Technology, 2022, 43(6): 892-900.

Figures/Tables 8

Fig. 1 Wiring diagram of eastern Shandong coastal power grid

Tab. 1 Load data of buses in eastern Shandong

编号	名称	电压等级/kV	有功负载/MW	无功负载/(MV⋅A)
1	QX	525	600	205
2	MP	525	600	113
3	KY	525	253	139
4	CY	230	79.34	12
5	ZB	230	122.3	-0.62
6	YT	230	210	21
7	ZL	230	166.4	14.58
8	HW	230	8.435	-9.89
9	MT	230	-6.31	-4
10	NH	230	61	15.2
11	GC	230	40.58	-1
12	HH	230	-18.9	13.5
13	DJ	230	151.6	-10
14	LT	230	61.76	11
15	QJ	230	34.4	3.8
16	FL	230	68.6	12
17	ZQ	230	35.4	16.5

Tab. 2 Index values of optional access points after standardization

并网点	风电消纳C₁	VSC电压支撑C₂	风电功率波动C₃	并网点脆弱度C₄	建设成本C₅
6	0.930 9	0	1.000 0	1.000 0	0.555 5
9	0.367 8	0.666 7	0	0.444 4	0.666 6
13	0	0.980 4	1.000 0	0	0
14	1.000 0	0.616 3	1.000 0	0.925 9	1.000 0

Tab. 3 Weight of each evaluation index

权重类型	风电消纳C₁	VSC电压支撑C₂	风电功率波动C₃	并网点脆弱度C₄	建设成本C₅
客观权重 $ω i ¯$	0.224 9	0.190 8	0.177 3	0.210 2	0.196 8
主观权重 $ω i ¯ ¯$	0.280 0	0.260 0	0.200 0	0.150 0	0.110 0
综合权重 $ω i$	0.252 5	0.225 4	0.189 6	0.180 1	0.153 4

Tab. 3 Weight of each evaluation index

权重类型	风电消纳C₁	VSC电压支撑C₂	风电功率波动C₃	并网点脆弱度C₄	建设成本C₅
客观权重 $ω i ¯$	0.224 9	0.190 8	0.177 3	0.210 2	0.196 8
主观权重 $ω i ¯ ¯$	0.280 0	0.260 0	0.200 0	0.150 0	0.110 0
综合权重 $ω i$	0.252 5	0.225 4	0.189 6	0.180 1	0.153 4

Tab. 4 Score of each optional access point

并网点	6	9	13	14
分值	0.690 0	0.425 4	0.410 6	0.901 2

Tab. 5 Results of voltage fluctuation

并网点	电压波动平均值/pu	电压波动最大值/pu
6	0.003 66	0.010 3
9	0.007 92	0.045 2
13	0.001 73	0.004 4
14	0.001 18	0.002 9

Fig. 2 Typical bus voltage of 1-2 branch 500 kV line fault

Fig. 3 Bus 10 voltage of 3-13 branch 220 kV line fault

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