中文摘要：

为解决传统离网型小风电系统风能利用范围有限、蓄电池充放电控制不合理等问题，研制了基于垂直轴的离网型异步电机风力发电系统，异步电机发电运行转速范围更宽，通过灵活的控制策略，对有功和无功功率同时进行调节，实现能量双向流动，同时解决机组以及蓄电池的协调控制，且能电动运行，帮助垂直轴风力机实现自启动。发电机采用转差频率控制，在风速和负载变化时通过脉宽调制变换器调节输出功率，母线上的卸荷器辅助完成对蓄电池充放电电流的分段限流控制，共同实现整个系统的功率平衡和稳定运行。对5．5kW样机系统进行了实验研究，结果证明了系统设计和控制策略的正确性和可行性。

英文摘要：

In order to solve the problems of limited wind power utilization range and inefficient charging and discharging control of the storage battery for small off-grid wind power generation system, a vertical-axis off-grid asynchronous generator wind power system is developed. The asynchronous generator can run in a wider speed range and self-start. By use of flexible control strategy, the active and reactive power output are regulated together to realize hi-directional flow of the energy and coordination control between wind turbine and the storage battery. The slip-frequency control strategy is employed in the induction generator to regulate the pulse width modulation （PWM） converter to control the output power when the wind speed and load change. The charging and discharging of the storage battery is controlled by a grading current-limit strategy with a power unloading device connected with the DC bus. All these strategies ensure the balanced and stable operation of the proposed system. Experimental research on a 5.5 kW prototype system is carried out, and the results verify the feasibility of the system design and control strategy.