Nowadays the need for optimum energy consumption and decreasing environmental effect of electricity resources along with increase of customer demand for high power quality and reliability have led power companies to the use of distributed generation. Growing penetration level of distributed generation in power system, can affect power quality considerably. Therefore firstly to prevent undesirable effects that these sources might have on the system and second to employ their potentials in improving power quality, it seems necessary to consider power quality phenomena in planning and operation of distributed generation. Synchronous generators are widely used as distributed generation in Iran. With respect to this fact, planning of distributed synchronous generators with regard to improvement in some power quality phenomena has been taken as the purpose of this thesis. Phenomena under investigation are mainly high frequent voltage phenomena including: steady state voltage profile, voltage imbalance and Voltage dip. In the first step, proper indices are introduced for every phenomena and from voltage quality point of view, multi-objective system performance index is proposed. Voltage profile and imbalance indices are introduced based on voltage sequence component in system buses. Evaluation of voltage dip has been accomplished based on monte-carlo stochastic simulation and the proposed indices for dip consider factors like voltage dip magnitude, number and the number of sensitive load interruption due to voltage dip. Through different scenarios, distributed generation installation planning with regard to different power quality phenomena is evaluated and optimal capacity and location of distributed synchronous generators will be determined. Systems under investigation in this study are IEEE 13 bus test feeder, distribution level of IEEE 30 bus system and IEEE 34 bus test feeder. By use of proper load flow algorithms and short circuit analysis, optimal planning of distributed synchronous generators is performed for these systems. Simulations are implemented in MATLAB software. Keywords: Distributed Generation, Distributed Synchronous Generators, Power Quality, Voltage Quality, Planning of Distributed Generation, Multiobjective Index
