Power quality analysis of distributed wind generation systems

Abstract

This paper analyzes one of the most crucial problems related to the harmonics pollution of distributed generators connected to distribution networks which contain non-linear loads. A wind-based distributed generation system is considered here which generates harmonics due to its power electronics interface to the grid. To investigate the interactions between distributed generation and loads, different types of non-linear loads, which are also a source of harmonics, are connected to the distribution network. When distributed generation and non-linear loads both are connected to establish a technologically upgraded system, then the harmonics from both ends merge in such a way that the resultant harmonics become extremely high that is very much deleterious for any system. This research examined the impact of the resultant harmonics in various possible conditions and pointed out that the harmonics nature and magnitudes are different for different types of loads. The system is also tested under different fault conditions and significant voltage sags and swells are observed. To analyze the effects, a model is considered encompassing a permanent magnet synchronous generator based wind turbine, an AC/DC/AC converter with current controller which is dependent on a straight line method and the total setup is connected to a 12 bus radial system to investigate the power quality issues. This power quality analysis is conducted on the PSCAD/EMTDC environment.