基于最大功率追踪的双馈风力发电机直接转矩控制

Direct Torque Control of a Doubly-fed Induction Generator of Wind Turbine Based on Maximum Power Extraction

根据风力涡轮机的工作原理及风电控制系统的特点,构建了以双馈感应电机为对象的变速恒频风力发电系统,为克服大风扰动对风电机组有功功率的影响,提出了采用融合最大功率追踪算法和直接转矩控制算法的控制策略,以提高功率控制的平稳性.以某风场1.5 MW双馈式风力发电机为参照,搭建机组的Matlab仿真模型,对不同风速扰动下的机组功率控制进行仿真,仿真结果验证了控制策略的可行性和有效性.

According to the principle of wind turbine and the characteristics of control system for wind power conversion,a variable speed constant frequency wind power system with doubly-fed induction generator is constructed. A control strategy which combines the maximum power point tracking algorithm with DTC is presented,overcoming the influence of strong wind disturbance on the active power of the unit and increase the stability of power control. Based on the 1.5MW doubly-fed wind generator of a wind farm,its Matlabmodel is built,the simulation of the power control under different wind speed is carried out,the result verifies the feasibility and effectiveness of the method.