Impact of Distributed Hybrid Wind Electric Power Conversion Systems on the Electric Distribution System

This paper examines the effects of the interconnection of hybrid wind electric generators in a typical distribution system. The Nashville Electric Service distribution system supplied by the Radnor Substation was chosen for the study to represent a typical distribution system since it serves a mix of residential, commercial, and industrial loads. In order to determine the effectiveness of hybridwind electric generators in alleviating potential future problems with the system, a high load growth, i.e. 10% per year, over the next 22 years was assumed. A load flow analysis was performed on this system with the 'EasyPower' power system analysis software without hybrid wind electric generators to establish a base case. The same system was then analyzed with hybrid wind electric generatorsconnected, which were represented as negative loads, in order to determine the effects of hybrid wind electric generator size and location on the distribution system. The generators size and placement were determined in such a way that they would meet the load demand without overloading the system components while maintaining the system voltage within a specified set of limits. It was determinedthat these generators could not only meet the load demand and maintain the voltage within +/- 5%, but they could also reduce the system losses and, thus, prevent overloading of the transformers and feeders. It was determined that the reactive current of the system could also be altered in a positive manner using the hybrid wind electric generator converters.