The Optimization Of Operation Cooling Of Double Feed Induction Generator

With the policy support to the MMW class green wind power energy from China government and the marketing requirement from China market, MMW wind turbine technology developed fast and was applied to real projects widely in China. China wind resource distributes wide, and the environment conditions are very various, which is the challenge to the applicability of wind turbine, especially in Inner Mongolia, Hebei, and Xinjiang provinces with high altitude and bad environment conditions. Some standard wind turbine (apply for these area with altitude is less than 1000m) were installed at these areas, and cooling system of the wind generator was insufficient under full power output due to the high altitude impact, therefore this generator would be over heating and over temperature. The traditional solution is to replace generator-cooling cooler with a big capacity of cooler; another traditional solution is to derating operation and prevent generator from overheating/over temperature.This research is to research and analyze the actual engineering issue, to adopt one new solution to let standard designed wind turbine meet the operation requirement in high altitude with avoiding generator over temperature issue: To apply 6 Sigma (6σ)methodology, to use frequency converter’s reactive power supporting capability, to reduce generator reactive power output, thus to reducing generator operation temperature/temperature rise, and prevent generator from over temperature. Through this research, we not only could avoid generator design change and cost up, but also needn’t do derating operation to impact the power output.The solution and technology in this paper are also available to offer one new operation control mode to new wind turbine system with re-distributing reactive power output way in DFIG system.