液压型风力发电机组功率追踪及功率平滑多目标控制研究

Research on Multi-objective Control of Maximum Power Point Tracking and Power Smoothing in Hydraulic Wind Turbine

以液压型风力发电机组为研究对象,针对低风速条件下液压型机组的最佳功率追踪和功率平滑多目标寻优控制问题进行研究。建立液压型风力发电机组逆系统模型,分析模型非线性形式,确定逆系统的解耦方法,利用逆系统的方法设计液压系统转矩控制器,实现最佳功率追踪控制。通过线性二次型最优控制方法,设计功率追踪与功率平滑的多目标优化控制器。依托30 k VA液压型风力发电机组实验台进行仿真和实验研究,验证了该方法的可行性。仿真和实验结果表明该方法具有较好的控制效果,在保证最佳功率追踪的同时实现了功率平滑控制。研究结果对液压型风力发电机组具有重要的理论意义和工程价值。

In this paper,the control of maximumpower point tracking and power smoothing in the hydraulic wind turbine and under low wind speed conditions was investigated. The inverse system model of hydraulic wind turbine was first established,followed by the analysis of the nonlinearization of the model and the determination of the decoupling method of inverse system. Then the method of inverse system was used to design the hydraulic system torque controller for the maximum power point tracking. And finally the multi-objective optimal controller for power tracking and power smoothing was designed based onthe method of linearity quadratic formoptimal control. Corresponding simulation and experimental studies were conducted based on the 30 k VA hydraulic wind turbine experiment platform,and the feasibility of the method was verified. Both simulation and experimental results showed that the presented method has achieved the control goal,and the maximum power point tracking control is guaranteed while the power smoothing control is also ensured. These research results are believed to provide a theoretical and experimental reference for the further research in the hydraulicwind turbine.