一种新颖控制模式的双向DC/DC变换器研究及设计

摘要

对于非并网风电分布式发电系统,双向DC/DC变换器需要跟踪风电发电系统能量流动方向,从而实现对蓄电池充放电控制.从输入阻抗的角度,提出一种能量流向判断模型,并给出判断准则.模型采用变换器输入电压外环和电感电流内环双环控制策略,能够自动检测能量流动方向.此外,对电感电流限制值与输入电压大小关系进行研究,推导出电感电流限制条件,当不满足该条件时输入电压均不能稳定在给定值.最后,对上述提出的模型和控制方法进行仿真,结果验证了理论推导的正确性和模型的可行性.%For non-grid distributed generation wind power systems, Bi-directional DC/DC converter (BDC) needs to realize the battery charge and discharge control by tracking the direction of energy flow. From the perspective of the input impedance, this paper presents an evaluation model of energy flow and gives the criterion. The mode which can automatically detect the direction of energy flow uses the double-loop control strategy with input voltage and inductor current. In addition, the relationship between inductor current limitation value and input voltage has been researched and inductor current limitation condition has been derived, input voltage can not be stabilized at a given value without meeting limitation condition. Finally, the simulation of the above mode and control strategy has been established, the results show that this novel technology is correct and feasible.