Adjustable speed generation system for wind turbine power quality improvement

The paper presents an emerging technology of electricity generation based on decoupled theory. The decoupled generation system operates in wide speed range and control strategy is oriented to select regions of high efficiency of the driving engine. This system is used to operate in parallel with renewable energy source RES, which is unstable and not reliable. In case of high power available from the renewable, the decoupled adjustable speed generation reduces it speed, what results in low fuel consumption. However when the renewable source power decreases, the adjustable speed generation system increases its speed, following points of high efficiency of the driving diesel engine. The paper presents topologies of the combined systems including variable speed, wind powered generation system and adjustable speed generation system driven by diesel engine. The ability of adjustable speed to provide power is discussed.