采用交变脉冲电源单元的隔离型多输入直流变换器

多输入直流变换器(MIC)实现多种能源输入,可同时或分时向负载提供能量,具有优先利用能源、简化系统结构及降低系统成本等优点,因此适用于新能源联合供电系统。本文针对输入输出隔离场合,提出采用交变脉冲电源单元构建隔离型MIC的方法:根据交变脉冲电源单元组合规则推导出基本隔离型MIC,利用最大功率传输原则确定MIC的控制策略,通过分析开关管的开关时序对基本隔离型MIC进行简化,进而得到多种不同类型的简化隔离型MIC拓扑。本文将详细给出通过交变脉冲电源单元构建隔离型MIC的方法,并以将半桥三电平单元与全桥单元组合而成的双输入变换器为例,采用有效的能量管理策略实现两输入源的功率分配,最后通过一个1kW的原理样机验证理论分析的正确性。

Isolated Multiple Input DC-DC Converter Using Alternative Pulsating Source as Building Cells

Multiple input converters(MICs) served as the interface of different sources with a load provide the energy to the load simultaneously or individually,which can optimize the utilization of sources,simplify the system structure and reduce the overall cost,so the MICs are attractive for the renewable power system.In this paper,a novel method using the alternative pulsating sources as building cells to derive the isolated MIC is proposed.The basic isolated MICs are derived according to the combination rules of alternative pulsating source cells,and the control strategy is proposed to realize the maximum power transfer,and therefore the basic isolated MICs will be simplified and different types of isolated MICs can be obtained.This paper will introduce the derivation of the isolated MICs using the alternative pulsating source cells in detail.Taking the double inputs converter consists of half-bridge three-level cell and full-bridge cell as the example,the operation principles are presented and the power management strategy is introduced.Finally,the theoretical analysis is validated by the experimental results of a 1kW prototype.