一种海上风电继电保护配置优化方案研究

Research on One Optimization Relay Protection Scheme of Offshore Wind Farm

[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 m^2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。

[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 m 2 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.