Conference Papers
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Item Development of adaptive distance relay for STATCOM connected transmission line(2011) Sham, M.V.; Chethan, K.S.; Vittal, K.P.Flexible AC Transmission System (FACTS) devices are inserted into power grids in series, in shunt, and in some cases, both in shunt and series for the improved power transmission capability. They also improve the controllability, stability and power quality of the power system. Static Synchronous Compensator (STATCOM) is a shunt type FACTS device connected at the midpoint of the transmission line to maintain the voltage at desired level by injecting/absorbing the reactive power. These devices have fast dynamic response time, which overlap with the response time of the line protection distance relays. This interaction affects the performance of distance protection relay during line faults. In this paper the design and development of a new adaptive distance relaying scheme to mitigate the adverse effects of the STATCOM is presented. A 100MVA 48 pulse STATCOM with associated control system, connected at the midpoint of a typical 400KV transmission system is selected for simulation. The line faults of different types at various locations of the line are simulated using EMTDC/PSCAD ® and the performance of newly developed adaptive distance protection scheme has been evaluated and efficacy of the proposed scheme is illustrated. © 2011 IEEE.Item Development of DSP based high speed numerical distance relay and its evaluation using hardware in loop power system simulator(2011) Sham, M.V.; Vittal, K.P.Numerical distance relays are used for the protection of long transmission lines. These relays require specialized hardware for high speed signal acquisition and computation of relaying quantities. The digital signal controller (DSC) and the data converters used in the relay have a major influence on the performance of the relay. In order to achieve high reliability and to reduce the size of the relay, it is desirable to use minimum hardware components. The newly arrived DSC and special range of data converters are offering optimal hardware solutions. This paper presents design and developments of distance relay hardware based on DSC TMS320F28335 and ADS8556 a simultaneous sampling type analog to digital converter (ADC), both from Texas Instruments. The distance relay designed using above hardware is evaluated through hardware in the loop (HIL) experimental setup. The fault transient signals are obtained from EMTDC/PSCAD considering a typical 220KV transmission line and these signals in turn are injected to the proposed relay through Doble F6150 power system simulator to perform elaborate dynamic tests. © 2011 IEEE.