UPFC串联变压器启动试验保护配置方法

针对统一潮流控制器(UPFC)串联变压器特殊的启动调试方法和充电路径,提出了一种临时保护配置方案。结合串联变压器充电方式提出在并联变压器阀侧开关设置临时过流保护的方案,该保护采用两段式配置,并基于串联变压器等值回路给出了故障电流计算和保护整定方法。进一步提出了UPFC串联变压器充电保护功能:利用UPFC保护实现串、并联变压器阀侧连接引线差动保护;提出了UPFC保护联跳功能,实现串联变压器内部弱故障时对串联变压器的有效隔离和快速切除电源。对串联变压器带电区域故障进行电磁暂态仿真,结果表明所提方法满足带电区域故障时保护灵敏度和速动性,具有现场可实施性。

Protection configuration method for start-up testing of UPFC series transformer

Aiming at the special start-up testing method and charging path of UPFC(Unified Power Flow Con-troller) series transformer, a temporary protection configuration method is proposed. According to the charging mode of UPFC series transformer, it is proposed to set the two-stage temporary overcurrent protection in the valve-side breaker of the shunt transformer, and the fault current calculation and protection setting methods are proposed based on the equivalent circuit of UPFC series transformer. Furthermore, the charging protection function of a kind of series transformer charging protection functionis is proposed: the differential protection of valve-side connecting lead between the shunt and series transformer is realized with UPFC relay protection, and the inter-tripping protection function is proposed to effectively isolate the series transformer and quickly trip the power source under the weak fault inside series transformer. The electromagnetic transient simulation of charged region fault in UPFC series transformer is carried out, the results of which indicate that the proposed method can satisfy the requirements of protection for sensitivity and speed, so it can be implemented in the field.