Impacts of Short Circuits on Wind Turbine Generator Interfaced Radial Distribution Feeder Sequence Impedance.

Abstract

With the global increase in wind turbine distributed generators penetration, the need for a detailed assessment of the impacts of the wind turbine generators (WTGs) on a power systems distribution network operations has become critical. This assessment is normally done to allow for the simulation of the dynamic response of the distribution network to major disturbances like the short circuits once wind turbine generators (WTGs) are connected. Penetration of the wind turbine generators into a distribution network has great impacts on the sequence impedance of the network with some factors contributing to this impacts being: The size of the WTG penetrating the distribution network, the location at which the WTG is connected and the Type of the WTG interfacing technology used. An important aspect of the WTGs studies is to evaluate their impacts on the distribution power system network positive, negative and zero sequence impedances under differing operating conditions. The magnitudes of the sequence impedances are important for analyzing the short circuit handling capacity of the distribution network. Due to the topological and operational differences between the different types of WTGs interfacing technologies , the electrical generators design industry have divided wind turbine generators into four different types labeled as Type I, Type II, Type III and Type IV. The main concern of this paper was to investigate the effects of integrating each of the four types of WTG configurations on the power systems distribution network’s positive, negative and zero sequence reactance/impedances. The radial distribution feeder studied was the IEEE 13 nodes radial test feeder and it was modeled and simulated for the sequence reactances/impedances analysis Keywords— Distributed Generators, Type I-IV WTG, Positive, Negative and Zero Sequence Reactances