Power Quality Studies in Islanding Mode of Operation

C. Bommareddy and E. Makram (USA)


Distributed Generation, Grid-connected mode, Stand alone mode, Voltage Control, Nonlinear load, Harmonics.


Deregulation, increasing demand, and barriers to building new generation and transmission infrastructure are all contributing to the increased interest in Distributed Generation. If the Distributed Generator (DG) is utilized to export power back to the utility distribution system, loss of the main supply can cause a severe overloading of the DG units. Consequently, the voltage and frequency will certainly fall below the statutory limits. Hence, it is imperative to control the voltage in the islanding mode of operation. Also, based on the operating conditions and several other criteria, islanding can cause both positive and negative impacts. It is necessary to effectively study the islanding operation in view of various aspects. Hence, this paper is concerned with the study of voltage control strategy, harmonic analysis and voltage sags for the operation of distributed generation systems (DGs) in the stand-alone mode of operation. Simulations have been carried on the IEEE 13-bus system using the PSCAD/EMTDC software in time domain using two different types of DGs in both the grid-connected and the stand-alone modes.

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