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38 - Distributed Generation and Power Quality Umar Naseem...

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Abstract— The main purpose of this paper is to discuss the basic understanding of power quality in relation to the distributed gen- eration. Due to considerable overlap between two technologies, disturbances affecting the power quality, which are mainly cause by the addition of Distributed Generation (DG) on the existing power system network. Injection of the DG into an electric power grid can affect the voltage quality. Distributed generation of dif- ferent voltage levels when connected to the power system network could influence the voltage regulation, sustained interruptions, harmonics, sags, swells, etc. All the information given here is col- lected from different references by keeping in mind the students at the beginning level of the concerned topic. Index Terms —power quality, distributed generation, distrib- uted generators, distributed resources, disturbances. I. INTRODUCTION The demand of power is escalating in the world of electricity. This growth of demand triggers a need of more power genera- tion. DG uses smaller-sized generators than does the typical central station plant. Distributed generators are small scale generators located close to consumers; normally Distributed Generators are of 1 kW to 100 MW [1]. Definition of DG [2] Distributed generation in simple term can be defined as a small-scale generation. It is active power generating unit that is connected at distribution level. IEEE defines the generation of electricity by facilities suf- ficiently smaller than central plants, usually 10 MW or less, so as to allow interconnection at nearly any point in the power system, as Distributed Resources. Electric Power Research Institute (EPRI) defines distributed generation as generation from a few kilowatts up to 50 MW. International Energy Agency (IEA) defines DG as “Power generation equipment and system used generally at distri- bution levels and where the power is mainly used locally on site”. The International Council on Large Electricity Systems (CIGRE) defines DG as generation that is not centrally planned, centrally dispatched at present, usually connected to the distribution network, and smaller than 50-100 MW. These generators are distributed throughout the power system closer to the loads. The DG penetration in the grid poses new challenges and problems to the network operators as these can have a significant impact on the system and equipment opera- tions in terms of steady-state operation, dynamic operation, reliability, power quality, stability and safety for both customers and electricity suppliers. However as we are only concerned with power quality of the primary and secondary distribution system, we will only consider generator sizes less than 10MW Umar Naseem Khan is with the Faculty of Electrical Engi- neering, Wroclaw University of Technology, Wroclaw 50-370, Poland (e-mail: [email protected]).
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