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我国近海区域(水深5~30 m、海平面以上50 m)风电可装机容量约20 GW,广东省近海海上风电可装机容量10.710 GW。目前国内试点开发的海上风力发电场总装机容量达200 MW~300 MW,由多台单机容量3 MW~6 MW的风力发电机组,分别经电力电子电源设备变换及箱式干变升压至35 kV侧,再经35 kV集电海缆汇集至海上升压站(或陆地、岛上升压站)电力变压器升压,最终接入110 kV或220 kV大陆电网[1,2]。
海上升压站空间有限,海上风电场投资成本高。研究海上风电场内继电保护合理分区,分析各区域继电保护合理配置及动作时限配合,提出适当优化设想,对提升海上风电场规模建设利用效能和节省海上升压站空间很有必要。
Research on One Optimization Relay Protection Scheme of Offshore Wind Farm
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摘要:
[目的] 为了提升海上风电场利用效能和节省投资成本,需要对海上风电场电气主设备的继电保护进行合理配置以及优化动作时限。 [方法] 取消220 kV海缆出线侧的断路器,连接海上升压站母线两侧的220 kV海缆纳入海缆“T”接线路的三端分相电流差动全线速动保护范围。同时,将35 kV站用变和35 kV接地变合并,采用简易35 kV母线保护,配置主变低压侧与35 kV进线开关之间电缆的零序CT等措施。 [结果] 因此,节省了1台220 kV断路器及2套220 kV母差保护投资。同时,节省了约70 m2的海上升压站空间和相应投资成本,提高了保护配置的灵敏性和可靠性。 [结论] 海上风电继电保护配置优化方案经济合理,有望应用于工程实践中。 Abstract:[Introduction] To improve the utilization efficiency and save the investment cost, the relay protection area and operation time in offshore wind farm need to be optimized. [Method] This paper eliminated the circuit breaker of 220 kV submarine cable outlet side, and steed the three-phase split current differential full range of rapid "T" zone protection for 220 kV submarine cable small bus. At the same time, the 35 kV station and 35 kV grounding transformer were combined, using simple 35 kV bus protection, and increasing the low pressure side of the main transformer zero sequence CT. [Result] The result shows that the optimization relay protection scheme can save a 220 kV circuit breaker and two sets of 220 kV bus differential protection investment. At the same time, the 70 m2 of space and corresponding investment cost of offshore substation can be saved. And the sensitivity and reliability of the protection configuration has been improved. [Conclusion] Finally, the optimal scheme of offshore wind farm relay protection is economical and reasonable, and it is expected to be applied in engineering practice. -
Key words:
- offshore wind farm /
- relay protection /
- T zone protection /
- simple bus protection
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