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摘要:[目的] 海上风电场面临着离岸距离远、检修组织船舶机械成本高、检修周期长，日常维护受气候海况影响大等特点，合理选择电气主接线方案对风电场长周期安全稳定运行、合理安排检修时间、保证经济效益具有重要意义。[方法] 主要对海上升压站送出海缆、主变、高中压侧电气主接线、重要电气设备联接的设计方案进行比较选择，通过短路电流计算、振动建模分析、运行工况分析等方法进行了不同方案的比较和探讨。[结果] 根据分析比对，提出了海上升压站选用双分裂主变、线变组布置、主变低压侧电缆连接的电气主接线方案。[结论] 希望对今后海上升压站的电气主接线设计提供借鉴。Abstract:[Introduction] Offshore wind farms are characterized by long distance from shore, high costs of repair due to vessels involved and weather, long maintenance cycles and the fact that daily operations and maintenance is highly dependent on weather and sea state. It is then of vital importance to select a reliable main electrical wiring for reliable operations of offshore wind farms, optimal planning of maintenance and secure finance returns.[Method] Various design schemes for subsea cables, main transformers, electrical wiring on the high/medium voltage side and major electrical components on the offshore substation have been compared and assessed in this paper through calculating short-circuit currents, modeling and analyzing vibration and various operating scenarios.[Result] Based on the comparisons and assessments, the main electrical wiring scheme is recommended to use three-winding main transformers, circuit-transformer unit arrangement and cable connection on the low voltage side of transformer for main electrical wiring scheme.[Conclusion] The design for main electrical wiring scheme for a 400 MW offshore substation is proposed in this paper.
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Keywords:
- offshore wind /
- electrical main /
- wiring /
- scheme
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图 6 双分裂变压器下的两组单母线分段接线
Figure 6. Two groups of single bus wiring under double split transforme
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图 7 双分裂变压器下的四组单母线接线
Figure 7. Four groups of single bus wiring under double split transformer
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图 9 主变低压侧管型母线连接方式
Figure 9. Main transformer low-voltage side tubular bus connection mode
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图 10 升压站某时段的振动加速度峰值变化时程图
Figure 10. Vibration acceleration peak change diagram of booster station during some periods of time
表 1 图2各点网速功率值
Table 1
Value of wind and power at each point in Figure 2 Wind/(m·s-1) Power/kW 0 0 1 0 2 0 3 0 4 189 5 427 6 773 7 1 255 8 1 890 9 2 701 10 3 496 11 3 893 12 3 989 13 3 999 14 4 000 15 4 000 16 4 000 17 4 000 18 4 000 19 4 000 20 4 000 21 4 000 22 4 000 23 4 000 24 4 000 25 4 000 
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表 2 短路电流计算结果表
Table 2
Short circuit current calculation table kA 短路点位置 双分裂变压器短路电流值 双绕组变压器短路电流值 陆上220 kV母线 15.97 16.1 海上220 kV母线 13.45 13.8 海上35 kV母线 16.37 27.12 风机侧35 kV母线 14.8 23.3 风机侧690 V母线 59.6 61.4
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表 3 振动强度统计表
Table 3
Vibration intensity chart 日期 最大加速度/(m·s-2) 加速度60 s最大均方根/(m·s-2) 日期 最大加速度/(m·s-2) 加速度60 s最大均方根/(m·s-2) 2016 09 0.366 0.020 0 2017 06 0.632 0.043 6 2016 10 0.513 0.023 0 2017 07 0.458 0.025 0 2016 11 3.515 0.355 0 2017 08 4.457 0.307 0 2016 12 0.326 0.018 4 2017 09 0.673 0.034 2 2017 01 0.405 0.025 0 2017 10 0.543 0.036 4 2017 02 0.537 0.036 0 2017 11 0.596 0.034 0 2017 03 10.034 0.792 0 2017 12 0.653 0.038 0 2017 04 14.897 0.635 0 2018 01 0.558 0.032 0 2017 05 0.5490 0.033 1 2018 02 0.428 0.024 0
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