Wind energy conversion systems have been introduced to power system as one of decentralized energy resources. The generated power is generally controlled by pitch control system with feed back. However, the generated power is always changing because the generators are driven by fluctuating wind speed, and besides due to time lag of feed back signal based on large moment of inertia of wind turbines. Particularly, such tendency is remarkable in Japan, where wind power plants are built in mountainous and rough terrain, and this brings much wind turbulence. Hence, the power system with small capacity is affected in case of large power fluctuations. This paper presents a useful method to reduce power fluctuations by using feed forward control.