Abstract:
This paper investigates the effects of large scale integration of distributed generation (DG), particularly wind system and photovoltaic system (PV), on power system steady state operation. The performance of power system with connecting DGs at different locations with different sizes is investigated from the economic and technical point of view. The total power loss is considered as a measure for the economical side where the voltage profile and total distortion harmonics (TDH) are considered as a technical decision for selecting the optimal location and size of DGs. Variety of configurations are analyzed and discussed. IEEE 30-bus test system is used to analyze the impact of DG on power system operation. The generation level of DGs is intended to meet the future increase in demand and provide the acceptable level of spinning reserve. Connecting DGs at the best locations are compared with connecting traditional steam power generation units from the view point of steady state operating conditions. The affecting on voltage profile, system losses and harmonic contents are compared in case of connecting DG compared with connecting traditional generation unit at the same buses. The results show that when the DGs connected at the best locations, the voltages profiles are improved and the power loss reduced where the THD slightly increased in case of connecting DGs. The results proves that the power system dynamic stability improves with connecting DG units at best locations.
