基于电流互感器供电的串补平台电源研制

Development of Power Supply for Electronics on Series Capacitor Platform as Driven by Current Transformer

火花间隙的控制电路在高电位下供电问题是其研制技术的一个重要内容。阐述了基于电流互感器供电的串补平台电源的原理、控制策略，其特点可以满足火花间隙的触发控制电路供电要求。研究了线路轻载和线路故障2种工况对平台电源的影响，并提出设计方法，进行了相关试验验证。试验结果证明：在稳态条件下，线路电流在5％～120％范围内，该电源能够很好为负载电路提供2W左右的能量，并且满足输出端电压波动不超过±5％要求。同时在线路短路暂态过程中，该电源仍能够可靠正常工作。

Trigger circuit for the spark gap of series capacitor compensation is located in high-potential environment, so the power supply for the trigger circuit becomes a key problem to be solved during the development of the spark gap. To meet the demand on power supply for the trigger circuit of the spark gap, the principle and control strategy of power supply for electronics on series capacitor platform （PSESCP） as driven by current transformer （CT） are presented. Impacts of two abnormal operating conditions of transmission line, namely the light-load condition and fault condition, on PSESCP are researched, on this basis, a method for the design of PSESCP is proposed and related tests are performed for the verification. Test results show that the developed PSESCP can provide about two watts of power for the load circuit and meet the demand that the fluctuation of output voltage of PSESCP is less than ± 5% when transmission line is in steady-state operation and the line current is within the range from 5% to 120% of rated value, in addition, the developed PSESCP can operate normally and reliably during the transient process caused by short-circuit fault occurred in transmission line.