液压能量调节型风力发电机组储能发电的恒频控制

Constant frequency control of energy-storage power generation of wind turbine set with hydraulic energy regulation

为了消除风能波动性和间歇性对电网平稳运行的冲击影响,实现风轮捕获能量的储存与调节,将储能系统引入到液压型风力发电机组的泵控马达闭式液压系统中,利用AMESim软件建立了无风时独立依靠储能系统储存液压能驱动马达旋转的数学模型.针对这种新型液压风力机液压系统的组成和工作原理,提出了一种恒压差+恒转速的双闭环马达恒转速控制策略以保证储能发电时发电机始终工作在同步转速.对比分析了在恒压差单闭环与恒压差+恒转速双闭环控制作用下系统各变量的响应曲线和变化趋势.仿真结果表明所设计的双闭环马达恒转速控制策略可以使马达转速稳定在1500 r/min,满足储能单独发电时对输出电能频率的要求.

In order to eliminate the impact of wind fluctuation and intermittence on the smooth operation of power grid and realize the storage and regulation of the energy captured by wind wheel,on energy storage system is introduced into the closed-loop hydraulic system with pump-controlled motor in hydropower-type wind turbine set.A mathematical model of motor rotation driven independently by stored energy in energy storage system is established by using AMESim software in the case of still wind.Aimed at the composition and working principle of such a novel hydraulic system of hydropower-type wind turbine,a double closed-loop control strategy of motor with constant pressure difference plus constant speed is proposed to ensure that the power generator with always operate at synchronous speed in the case of power generation with stored energy.The response curves and changing trends of various system variables are compared and analyzed under condition of single closed-loop with constant pressure difference and double closed-loop control with constant pressure difference plus constant speed.The simulation result shows that the designed double closed-loop motor with constant speed control strategy will be able to stabilize the motor speed at 1500 r/min,meeting the requirement of the output power frequency in case of independent power generation with stored energy.