限定寻优区间的风力机最大功率点跟踪控制

An improved maximum power point tracking control for wind power system by specifying optimal searching range

自适应转矩控制是为改善风力机跟踪性能而提出的一种最大功率点跟踪控制方法,但是由于受到风速变化的干扰,导致该方法难以搜索至最佳增益系数。文章针对该问题提出一种改进自适应转矩控制方法。该方法通过分析自适应转矩控制的最佳增益系数与风速条件的关系,并据此设置增益系数的寻优区间,以剔除偏离最佳值较大的异常值。研究结果表明,与自适应转矩控制、传统功率曲线法和减小转矩增益控制相比,新方法能有效改善上述问题,并显著提高风能捕获效率。

The adaptive torque control method, which is a maximum power point tracking control method, has been proposed to improve the performance of wind turbine. However, it＇s usually hard to get the optimum gain coefficient due to the effect of wind turbulence. Here, an improved adaptive torque control method（a new method） was proposed to resolve the above issue. In the new method, the relationships between the optimum gain coefficient and wind speed was first analyzed, and then the optimal searching ranges of the gain coefficients was re-defined. Finally, the obtained anomaly coefficients, which located outside the given ranges, were excluded. The calculation results show that the new method can effectively solve the above-mentioned issue and enhance the caption efficiency of wind energy, when compared with the previous methods including the adaptive torque control method,the traditional power feedback method, and the decreased torque gain control method.