直驱型海浪发电系统输出功率优化控制策略

An Optimal Control Strategy for Output Power of the Directly Driven Wave Power Generation System

直驱型海浪发电系统具有结构简单、安全性高、易于维护的特点。文中以直驱型永磁直线海浪发电机为研究对象,建立了永磁直线发电机的数学模型,推导了基于双自由度和单自由度控制模式的优化功率算法,提出了基于优化功率算法的发电机电磁力控制策略:以海浪的周期和幅值为输入信号,在线计算最优电磁力目标值;发电机电磁力控制采用dq同步旋转坐标下带前馈补偿的矢量解耦控制方法,实现了对永磁直线发电机的解耦控制,充分利用了发电机容量。搭建了基于MATLAB/Simulink的直驱型永磁直线海浪发电机模型,并对直驱型海浪发电的2种优化功率跟踪算法进行了仿真与对比分析,结果验证了模型的合理性及控制策略的有效性。

The directly driven wave power generation system has simple structure,easy maintenance and high security.The directly driven permanent magnet linear generator（DDPMLG） is studied and the mathematical model for permanent magnet linear generator is established.The optimal power control algorithm is derived based on the control modes of the double freedom degree and the single freedom degree.The control strategy for the generator electromagnetic force is proposed based on the optimal power algorithm： the time period and the amplitude of the wave are used to calculate the optimal electromagnetic force reference as input signals;in the control of the generator electromagnetic force,the vector decoupling control method is applied in the dq rotational synchronous coordination to realize the control of electromagnetic force control of PMLG,which utilizes the capacity of generator sufficiently.Simulation model for DDPMLG is built in MATLAB/Simulink to analyze and compare the two optimal power tracking methods.The simulation results verify the feasibility of the model and the effectiveness of the control strategy.