Economic Analysis of Maximum Cross-Section of Submarine Cables for 66 kV Offshore Wind Farm Collection Systems

doi:10.11930/j.issn.1004-9649.202209065

Abstract

Abstract:

Topology optimization design of the maximum submarine cable cross-section for offshore wind farm collection systems is an effective means to reduce the total investment of the offshore wind farms and improve the transmission efficiency and system reliability. Since the collection system pooling network has various types of topology and the constraints for selecting the maximum submarine cable cross-section are not considered in the existing optimization studies, there exist low efficiency and high difficulty in the non-convex and non-linear optimization search process of collection system topology, and it is difficult to obtain a global optimal layout scheme. To this end, we propose an economic analysis method for selection of the maximum submarine cable cross-section for 66 kV offshore wind farm collection systems. The constraints for selecting the optimal submarine cable maximum cross-section are added in the process of topology optimization of collection systems through uniparental genetic algorithm and minimum spanning tree technique (MST) to reduce the search space, improve the search accuracy and accelerate the search speed. The results of case study show that it has a significant impact on the economic optimization results to consider the selection constraints of the maximum submarine cable cross-section in the planning of collection system.

Key words: offshore wind farm, 66 kV collection system topology, uniparental genetic algorithm, minimum spanning tree technique, submarine cable cross-section, economic optimization, submarine cable reliability calibration

Chaohui WANG, Songge HUANG, Bin LIN, Yuwei CHEN, Shumin FAN, Zhaohui SHI. Economic Analysis of Maximum Cross-Section of Submarine Cables for 66 kV Offshore Wind Farm Collection Systems[J]. Electric Power, 2023, 56(11): 20-28.

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URL: https://www.electricpower.com.cn/EN/10.11930/j.issn.1004-9649.202209065

https://www.electricpower.com.cn/EN/Y2023/V56/I11/20

Figures/Tables 11

References 22

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海缆规格/mm²	载流量/A	价格/(万元·km^–1)
3×95	302	186.81
3×120	341	201.04
3×150	379	216.03
3×185	423	235.62
3×240	483	261.87
3×300	533	292.79
3×400	591	340.01
3×500	649	391.60
3×630	705	460.60
3×800	753	544.00
3×1000	791	648.56
3×1200	812	736.80
3×1400	833	845.99

海缆规格/mm²	载流量/A	价格/(万元·km^–1)
3×95	302	186.81
3×120	341	201.04
3×150	379	216.03
3×185	423	235.62
3×240	483	261.87
3×300	533	292.79
3×400	591	340.01
3×500	649	391.60
3×630	705	460.60
3×800	753	544.00
3×1000	791	648.56
3×1200	812	736.80
3×1400	833	845.99

方案	海缆截面选择/ mm²	总回路数	总长/ km	海缆总费用/ 亿元	海缆损耗现值/ 亿元	海域使用费/ 亿元	66 kV风机进线柜总费用/ 亿元	综合造价/ 亿元
1	38/66 kV 3×95~ 3×300	6	51.1	1.1348	0.2395	0.0890	0.0480	1.5113
2	38/66 kV 3×95~ 3×500	5	52.0	1.2639	0.2646	0.0907	0.0400	1.6592
3	38/66 kV 3×95~ 3×800	4	43.5	1.2665	0.2288	0.0735	0.0320	1.6008

方案	海缆截面选择/ mm²	总回路数	总长/ km	海缆总费用/ 亿元	海缆损耗现值/ 亿元	海域使用费/ 亿元	66 kV风机进线柜总费用/ 亿元	综合造价/ 亿元
1	38/66 kV 3×95~ 3×300	6	51.1	1.1348	0.2395	0.0890	0.0480	1.5113
2	38/66 kV 3×95~ 3×500	5	52.0	1.2639	0.2646	0.0907	0.0400	1.6592
3	38/66 kV 3×95~ 3×800	4	43.5	1.2665	0.2288	0.0735	0.0320	1.6008

方案	38/66 kV海缆截面选择/mm²	总回路数	总长/km	海缆费用/亿元	海缆损耗现值/ 亿元	海域使用费/亿元	66 kV风机进线柜总费用/亿元	综合造价/亿元
1	3×95~3×300	9	85.7	2.0333	0.4344	0.1499	0.0720	2.6896
2	3×95~3×500	8	78.7	2.0049	0.4240	0.1358	0.0640	2.6287
3	3×95~3×800	7	76.8	2.2212	0.3843	0.1321	0.0560	2.7936
4	3×95~3×1400	6	77.4	2.6897	0.3751	0.1332	0.0480	3.2459