风光互补双输入DC/DC变换器研究

摘要

According to some problems of the wind/PV hybrid system, such as efficiency, cost, when the wind and PV power energy synthesize, the principle of the proposed double-input DC/DC converter is studied.This paper analyzes different working states of the converter and current fluctuation of inductance L, the core energy storage device of the main circuit.The relationship among input voltage, current, duty ratios and output voltage, current can be obtained by steady-state analysis. A new driving method called alternate working is proposed. Using this method, series connection of wind power and PV cells is avoided,and efficiency of the system is improved.Theoretical arithmetic shows that this method can reduce the current fluctuation of inductance.At last the simulation and experimental results are proposed.%针对目前风光瓦补系统中风电和光电在能量合成时能量利用率低的问题,研究了双输入DC/DC变换器.分析了主电路工作状态和核心储能元件电感上的电流波动大小,通过静态分析得出输入电压、电流、占空比及输出电压、电流之间的关系.提出了交替工作的驱动方法,避免了风电和光伏电池的串联,提高了能量利用率.理论计算表明,相对于同时关断,该方法能够减小电感上的电流波动.最后给出仿真与实验结果.