【摘要】 独立光伏系统受温度、光照强度等影响,其输出功率具有间歇性、分时性的缺点,然而储能系统"削峰填谷"的功能可以弥补光伏系统的缺点。文章通过双向Buck/Boost电路实现能量的双向流动,采用互补的PWM控制方式实现蓄电池充放电的平滑切换,应用电压电流双闭环控制的方法来抑制直流母线电压的波动。采用双重变换器不仅能够减小电感的大小和设备的重量,而且能够减小电压纹波的大小,同时增加了设备的容量。最后在实验室现有设备的基础上搭建相关实验平台,验证了基于双重双向DC/DC变换器的光储系统及相关控制策略的有效性与优越性。更多还原

【Abstract】 Affected by temperature,light intensity and other factors,the stand- alone photovoltaic system has disadvantages of intermittence and time- sharing. However,the ‘peak’feature of energy storage system can make up the shortcomings of the photovoltaic system. The bi- directional energy flow is realized by bi- direction Buck / Boost circuit. Complementary PWM control method is adopted to realize the smooth handoff for storage battery charging and discharging. Voltage and current double closed- loop control method is applied to suppress the DC bus voltage fluctuations. Dual bi- directional Buck / Boost converter can not only reduce the weight of the inductor and the size of the equipment,but also reduce the size of the ripple voltage and increase the capacity of the equipment at the same time.Finally the experiment platform is set up on the basis of laboratory equipment,and verifies the correctness of the control strategy.更多还原