基于超级电容-蓄电池混合储能的小型直驱风机综合控制策略及运行特性研究

Study on Operation Characteristics and Control Strategy of Small Direct-drive Wind Turbine with Super Capacitor-Battery Hybrid Energy Storage

针对小型分布式直驱风力发电机对运行工况快速变化的敏感性问题以及功率波动问题,利用超级电容-蓄电池混合储能系统的互补特性,提出了一种以直流母线为控制对象、以直流电压恒定为控制目的混合储能系统的控制策略,来抑制风速变化对风机运行稳定性的影响,提高机组运行效率。小型直驱风机、超级电容-蓄电池混合储能系统及逆变器的数学模型进行了详细研究分析,在此综合控制策略的基础上,搭建了带超级电容-蓄电池混合储能装置的小型分布式直驱风力发电系统并网模型,并对其并网运行特性进行了仿真分析,验证了该控制策略的有效性。该策略可以有效抑制风机输出功率的波动性,提高了其运行稳定性。

In view of the sensitivity of small distributed direct-drive wind turbines to rapid change of operating conditions and the problem of power fluctuation, a kind of control strategy based on the complementary characteristics of super capacitor- battery hybrid energy storage system which selects DC bus as control object and constant voltage as control purpose is proposed to improve the operating efficiency of wind turbines. The mathematical models of small direct-drive wind turbine, hybrid energy storage system and inverter are analyzed, and then the simulation model of a small direct-drive wind power generation system with hybrid energy storage devices is built based on above control strategy. The simulation results of system operation verify the effectiveness of control strategy. The control strategy can effectively restrain output power fluctuation and improve operation stability of small distributed direct-drive wind turbines.