变速变桨距风力机功率控制策略

Power Control Strategies of Variable Speed and Variable Pitch Wind Turbines

针对风力机运行区域特点,提出变速变桨距风力机功率控制策略。以风力机专业设计软件Bladed为工具,对风力机功率控制策略进行仿真研究;结合C++语言对Bladed进行二次开发,设计其外部控制器;外部控制器和Bladed进行数据交换,控制风力机功率输出,优化风力机性能。仿真结果表明:在额定风速以下,外部控制器能够追踪最大功率;在额定风速以上,外部控制器能够使输出功率幅值小于采用内置控制器时的输出功率幅值,并使输出功率值稳定在额定值附近;在全负荷最优控制阶段,外部控制器能够根据风速的变化迅速做出调整,实现控制平滑过渡。外部控制器的功率控制性能更优,验证了所提功率控制策略的正确性和可行性。

According to the feature of operation range of variable speed and variable pitch wind turbines, a power control strategy for them is proposed. Utilizing C＋＋ language, the secondary development of the professional design software Bladed for wind turbines as the tool is performed to design the external controller of Bladed; the designed external controller exchanges data with Bladed to control the power output of wind turbine and optimize the performance of wind turbine. Simulation results show that under the wind speed lower than its rated value the external controller can trace maximum power of wind turbine; under the wind speed higher than its rated value the external controller can make the amplitude of power output less than that controlled by internal controller and stabilize the power output near its rated value; during the course of full load optimal control, according to the variation of wind speed the external controller can rapidly regulate the wind turbine to implement smooth transition of control process. Thus the proposed external controller possesses a better performance and the correctness and feasibility of the proposed power control strategy are varied.