I. Introduction
The increasing importance of reducing greenhouse gas emissions has been the key drive for a number of Australian government programs which aim to facilitate new generation projects with lower gas emissions than the pool average [1]. These generators are normally intended to operate while electrically connected to the distribution network, and they utilize renewable energy (hydro, solar, wind, and biomass) or low greenhouse emission fuels (natural gas). They are known as distributed generation (DG) resources. The connection and operation of the DG not only can reduce environmental emissions but also offer a number of benefits compared to the conventional ones, such as lower capital cost of generation, generation capacity to more closely match the demand, and higher potential for enhanced security of supplies and improved power quality [2]. For these reasons, interest for the installation of DG has been growing rapidly worldwide in the last decade.