Research On Comprehensive Performance Evaluation System For Large Wind Turbine

Along with the fast development of wind energy, the capacity of single wind turbine is increasing. Although the design life of a wind turbine is 20 years, wind turbines always work under the effect of alternate load, and their working environment is very bad, which makes the turbines fault during their operation, and results in decreasing of their performance. And because of management and technology, the operation state is difficult to grasp. Once fault happens, not only results in loss, the maintenance is difficult to run. Above all establish the performance evaluation to a wind turbine and grasp the operation state of a wind turbine is very important.In this paper, the importance of establishing the performance evaluation was analysed, and then the working principle and performance parameter were briefly introduced. Based on the works of other persons, the following works were done:1) Based on the standard from International Electrotechnical Commission about performance test of wind turbine, Power performance measurements of electricity producing wind turbines (IEC61400-12-1), the performance evaluation method to wind turbines based on real test dada was established. And using this method, the real test data of some kind of wind turbines was processed, then the performance of this wind turbine was evaluated, and the feasibility and the scope of application of this method were proved.2) The problem of correction to the real test wind speed was discussed, the finite element analysis to the wind speed situation of the wind speed test position in the behind of the nacelle was done. And the conclusion is, the wind speed measured by the anemometer of the turbine and the wind speed of the forefront of the rotor present the relation of linear. The validity of this method and its conclusion were proved by the real test data of wind turbine.3) The method "fuzzy comprehensive evaluation" was used into wind turbine performance evaluation, in which the corresponding parameters of power curve were selected as the input parameters. Then the quantitative value of the evaluation result was obtained. Through real data the feasibility and stability of "fuzzy comprehensive evaluation" were proved. At last, an interactive performance evaluation software for wind turbines was developed.