An Interface Converter with Reduced Volt-Ampere Ratings for Battery-Supercapacitor Mixed Systems
An Interface Converter with Reduced Volt-Ampere Ratings for Battery-Supercapacitor Mixed Systems
复制标题
用于电池-超级电容器混合系统的具有降低伏安额定值的接口转换器
DOI：
10.1541/ieejias.128.418
复制
发表时间：
2008
影响因子：
--
通讯作者：
Y. Hori
中科院分区：
文献类型：
--
作者：
G. Guidi;T. Undeland;Y. Hori
车辆和牵引系统通常具有较大的峰值-平均功率比，这使得它们成为部署混合电池-超级电容器（SC）储能系统的理想候选者。在SC缓冲器和负载之间的双向功率流的控制通常是通过一个简单的半桥转换器来实现的。变换器的电压比基本上取决于SC缓冲器的充电状态，因为可以假设电池电压几乎是恒定的。通常的做法是让SC电压在额定电压和额定电压的50%之间变化，从而实现75%的能量利用率存储在缓冲器中。这导致转换器中的最大电压比为2，这意味着用于构建半桥的电力电子开关必须具有至少等于SC缓冲器设计提供（或吸收）额定功率的两倍的伏安额定值。本文提出了如图1所示的变换器，该变换器基于两个SC组的串联连接，并在其中一个组之间架起半桥。结果表明，这种变换器可以用伏安额定值等于SC缓冲器额定功率的开关器件来构建；如果使用标准的半桥拓扑，这是所需的一半。在不影响控制双向功率流的能力的情况下，半导体额定值降低了50%，并允许在超级电容器中存储相同的75%的能量利用率。结果表明，在无损元件的理想情况下，串联SC组之间的电压共享由拓扑本身决定，而不依赖于负载电流的特定形状：
Vehicles and traction systems in general are characterized by large peak-to-average power ratios, making them an ideal candidate for deployment of hybrid battery-supercapacitor (SC) energy storage systems. Control of the bidirectional power flow between the SC buffer and the load is usually achieved by a simple halfbridge converter. Voltage ratio of the converter depends essentially on the State Of Charge of the SC buffer, since the battery voltage can be assumed to be almost constant. It is common practice to let the SC voltage vary between the rated voltage and 50% of the rated voltage, thus achieving 75% utilization of the energy stored in the buffer. This leads to a maximum voltage ratio of 2 in the converter, meaning that the power electronics switches used to build the half bridge must have a Volt-Ampere rating equal to at least twice the rated power that the SC buffer is designed to supply (or absorb). In this paper, the converter in Fig. 1 is proposed, based on series connection of two SC banks and a half bridge across one of them. It is shown that such a converter can be built with switching devices having Volt-Ampere rating equal to the power rating of the SC buffer; that is half of what would be necessary if a standard half bridge topology is used. The 50% reduction of semiconductor rating is achieved without compromising the ability to control the bidirectional power flow and allowing for the same 75% utilization of the energy stored in the supercapacitors. It is demonstrated that in the ideal case of lossless components, the voltage sharing between the series connected SC banks is determined by the topology itself, and does not depend on the particular shape of the load current: