Patent ID: 8343242

Claim:
A method of controlling an apparatus for generating electric power, which apparatus comprises a gasifier for biomass material, such as waste, wood chips, straw, etc., which is of the shaft and updraft fixed bed type, which from the top is charged with the raw material for gasification and into the bottom of which gasifying agent is introduced, and a gas engine driving an electrical generator for producing electrical power, the gas engine being driven by the fuel gas from the gasifier, said method comprising the following steps; supplying the produced fuel gas directly from the gasifier to the gas engine without employing a gas holder, and controlling the production of the fuel gas in the gasifier in order to maintain a set desired constant electrical output power, wherein the controlling of the production of the fuel gas comprises the steps of; controlling the generated power by control of the position of a gas control valve inserted between the gasifier and the gas engine, controlling a fan inserted between the gasifier and the gas control valve to maintain a constant pressure to the gas control valve, and controlling the supply of gasifying agent in order to maintain a constant pressure of the fuel gas delivered at the top of the gasifier to the fan.