UPFC系统的变压器差动保护分析

并联变压器和串联变压器是统一潮流控制器(UPFC)的核心交流器件,差动保护作为这两类变压器的主保护,受UPFC特殊的运行工况影响,在不同的运行条件和不同类型的故障下会表现出不同的特性。为分析评估UPFC中各类故障对差动保护的影响,文中以实际UPFC工程的控制系统为基础,讨论了各类故障下可能对并联、串联变压器差动保护灵敏性及可靠性产生影响的因素;根据变压器区内外典型故障的仿真结果,分析了差动保护在此类故障下的行为特征,形成差动保护的适应性分析,验证了保护配置的有效性;从保护设备的角度出发,讨论了阀控制保护与交流继电保护的关系,从防误和防拒两方面为UPFC工程的交流继电保护实施提供技术参考。

Transformer differential protection in UPFC system

Transformer is the core AC device of Unified Power Flow Controller (UPFC), including parallel transformer and series transformer. UPFC has special operating conditions, which easily affects transformer differential protection. Based on the control system of actual UPFC project, this paper discusses the factors that may affect the sensitivity and reliability of differential protection when faults happen. According to the simulation results of typical inside and outside faults, the behavior characteristics of differential protection under such faults are analyzed, and the adaptability analysis of differential protection is formed. This paper also discusses the relationship between valve control protection and AC relay protection from the point of view of protecting equipment..#$NLKeywords: UPFC; Series Transformer; Parallel transformer ;Differential protection; Adaptability analysis