POWER VARIATION CONTROL OF A WIND GENERATOR BY USING FEED FORWARD CONTROL

The pitch control of wind generators is usually made by a feed back co ntrol concept. However, under the conditions where a wind speed change s very frequently due to geographic reasons of the site and the target system has large rotor inertia, the feed back signal which is applied to the control system to compensate disturbance such as wind speed va riations is delayed, and consequently the control strategy to keep the generated power at a constant value does not work well. If the wind s peed shows too much variation, this will cause a violent variation of power and result in step out operation of the generator from the power system due to magnetic saturation. This paper proposes a control stra tegy to reduce the power variations by introducing feed forward contro l combining with the conventional feed back control. (C) 1998 Publishe d by Elsevier Science Ltd. All rights reserved.