中文摘要：

基于电气无级变速器及带有电池储能装置的双功率流风力发电系统是近年提出的一种新型风力发电系统结构。文中提出了该系统的整体控制策略,以控制风力机、电气无级变速器电机、电池及电网之间的能量流动。首先,提出了基于定子侧变频器的最大风能跟踪控制策略,同时提出了当风速高于额定值时风力机的变桨距控制策略。然后,基于内转子侧变频器,提出了离网和并网2种情况下不同的控制策略。电池储能装置的应用可使系统根据电网需求调节输出功率,平缓风能波动,同时通过控制可稳定定子与内转子之间的背靠背变频器的直流侧电压。基于电气无级变速器电机的数学模型和控制策略,建立了整个系统的仿真模型,仿真结果证明了针对此新型双功率流风力发电系统提出的控制策略的有效性。

英文摘要：

A dual power flow wind energy conversion system（WECS） based on an electrical variable transmission（EVT） machine and battery energy storage is proposed recently.A control strategy is presented to control the energy flow among the wind turbine,the EVT machine,the battery and the grid.First,a maximum power point tracking control strategy for the dual power flow WECS is developed by controlling the stator-side converter.And the pitch control strategy for the wind turbine is proposed when the wind speed is beyond the rated value.Then both the off-grid and grid-connected control strategies for the inner rotor are proposed to adjust the power output to the grid.In addition,the battery energy storage system（BESS） is controlled to mitigate the wind energy fluctuations and DC voltage to follow the grid demand.The model for the overall WECS is developed based on the mathematical models and control strategies.Simulation results are demonstrated to verify the efficiency of the proposed WECS with battery energy storage and energy flow control strategies.