In this book, systems and technologies of distributed generation (DG) for electricity generation or Combined Heat and Power (CHP) are discussed. DG generally refers to micro and small-scale (typically 1 kW-50 MW) electric power generators that produce electricity at a site close to customers or that are tied to an electric distribution system. Distributed generators include, but are not limited to synchronous generators, induction generators, reciprocating engines, micro turbines, combustion gas turbines, fuel cells, solar photovoltaic panels and wind turbines.