Some investigations on impact of statcom on loss of excitation protection

Abstract

The protection of generator is very complex and challenging newlinebecause of the auxiliary equipments that are connected to the generator. newlineIn case of fault on the generator it is not enough to trip the main breaker and newlineisolate the generator as there are auxiliary equipments that are connected to newlinethe generator. A fault/abnormal condition that occur on auxiliary equipment newlinemay lead to generator failure. Each and every auxiliary equipments connected newlineto the generator makes the protection of generator challenging. Loss of newlineexcitation is a frequent fault that accounts for 70% of all generator failure. newlineIt is necessary to detect loss of excitation as soon as possible. newlineNowadays Flexible AC Transmission System devices are newlineextensively used for its various benefits like increase in power flow capability newlineand voltage control. The presence of FACTS devices like Static Synchronous newlineCompensator (STATCOM) in transmission line affects the measured voltage, newlinecurrent and impedance by the protective relays in the system. The STATCOM newlineconnected in mid-point of transmission line affects the reach/operating time of newlineloss of excitation protection relay. newlineIn this context the simulation studies and hardware in-loop newlinesimulation using real time digital simulator (RT Lab), power amplifier and newlinenumerical relay (MiCom-P343) is performed to analyse the real time impact newlineof STATCOM on traditional loss of excitation protection relay. The analysis newlineis performed for total loss of excitation condition and partial loss of excitation newlinecondition. The results of investigations shows that the transient response of newlinethe STATCOM during loss of excitation condition affects the reach/operating newlinetime of loss of excitation relay. newline