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为了提高永磁直驱风力发电系统的全风况运行性能,根据多阶段发电的特点和要求,分析建立了基于最佳转矩控制策略的额定风速以下最大功率跟踪控制系统模型,以及基于恒功率控制策略的额定风速以上功率平衡控制系统模型,设计了系统全风况发电控制器。控制器采用滑模幂指数趋近律设计方法,并将切换函数幅值作为负反馈量,引入切换增益的调节机制,以协调系统跟踪的快速性指标与抑制超调的能力;通过在滑模控制律中引入控制输入量的一阶积分项,形成在时间上连续的动态滑模控制律,以抑制抖振,提高控制精度和鲁棒性。仿真实验验证了所述控制方法的先进有效性。
Based on the characteristics and requirements of multi-stage power generation, a maximum power tracking control system model based on the optimal torque control strategy and rated wind speed is established to improve the whole wind-driven performance of PMDC wind power generation system. Control strategy rated wind speed above the power balance control system model, the design of the system full wind power generation controller. The controller uses the approach of sliding-mode exponentiation approach law, and uses the switching function amplitude as the negative feedback to introduce the switching gain adjustment mechanism to coordinate the fastness index of the system tracking and the ability of suppressing overshoot. The control law introduces the first-order integral term of control inputs to form a continuous sliding mode control law in time to suppress chattering and improve control accuracy and robustness. Simulation experiments verify the advanced effectiveness of the control method.