海上换流站站用电系统方案研究

Research on Auxiliary Power System Scheme for Offshore Converter Station

[目的]针对海上换流站的特点,提出海上换流站站用电系统设计方案。[方法]通过分析国内外对海上换流站站用电的要求,结合海上风电场的建设情况及实际需求,提出海上换流站站用电系统的设计方案。[结果]首次提出海上换流站设置站外电源的方案,简约化的接线方案可提高设备利用率和站用电的转换效率,并对其控制保护进行分析,验证该接线方案的实用性和可靠性。对比海上升压站低压配电系统的方案,提出了不设置应急段母线及柴油发电机在出口处并接的优化方案,并通过实例分析海上换流站负荷特性,提出了柴油发电机容量、油箱容量、柴油发电机进线断路器选择的方法。[结论]研究的方案在保证站用电可靠性的前提下进行了优化设计,具有较强的实用性和适用性,为海上换流站站用电系统设计提供指导。

[Introduction]Aiming at the characteristics of offshore converter station,this paper proposes the design scheme for auxiliary power system of offshore converter station.[Method]By analyzing the requirements for auxiliary power system at offshore converter station both at home and abroad,in combination with the construction situation and actual needs of offshore wind farms,a design scheme for the auxiliary power system at offshore converter station was proposed.[Result]The scheme of setting up off-site power supply for offshore converter station is proposed for the first time.A simplified wiring scheme can improve equipment utilization and conversion efficiency of auxiliary power system,and its control protection is analyzed to verify the practicality and reliability of the wiring scheme.Comparing with the scheme of low-voltage distribution system of offshore booster station,the optimization scheme of not setting emergency section bus and connecting diesel generator in parallel is proposed.Through analyzing the load characteristics of offshore converter station,the method of selecting the capacity of diesel generator,the capacity of fuel tank and the diesel generator incoming circuit breakers is proposed.[Conclusion]Therefore,it has been optimized while ensuring the reliability of auxiliary power system,which has strong practicality and applicability,and provides guidance for the design of auxiliary power system for offshore converter station.