Modeling and Analysis of Four-Port DC-DC Converter

Ashish Laddha, N. Satyanarayana, Riya Jain
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引用次数: 1

Abstract

During recent past, DC natured electrical networks such as a DC micro-grid have received significant attention over their conventional AC driven counterparts. An increasing interest in the renewable, clean, and sustainable power generating sources, natively DC energy storage, and semi-conductor technological advancements led large number of DC equipment are behind this ever-increasing interest in the DC natured electrical networks. Interfacing seems necessary in an electrical network to establish the compatibility between different possible voltage levels available at the generation, energy storage, and loads. Multiport DC-DC converter (MPC) based interfacing is superior over the conventional two port single-input single-output interfacing structure. Motivated by these, this article considers a four-port DC-DC converter (FPC) design, which accommodates fuel cell (FC), battery bank (BB), solar photovoltaic (SPV) system, and DC load at its ports. The presented work formulates linear state-space model of the considered FPC. In this formulation, small signal modeling of the FPC is done from the detailed model of the latter. The process of obtaining a small signal model requires linearization of corresponding large signal models. Finally, the work compares large, and small signal responses of states of state-space model of the FPC.
四端口DC-DC变换器的建模与分析
近年来,与传统的交流驱动电网相比,诸如直流微电网之类的直流自然电网受到了极大的关注。对可再生、清洁和可持续发电的兴趣日益增加,原生直流储能和半导体技术的进步导致大量直流设备背后是对直流自然电网日益增长的兴趣。在电网中,接口似乎是必要的,以便在发电、储能和负载中建立不同可能电压水平之间的兼容性。基于多端口DC-DC变换器(MPC)的接口结构优于传统的双端口单输入单输出接口结构。受此启发,本文考虑了一种四端口DC-DC转换器(FPC)设计,该设计可容纳燃料电池(FC),电池组(BB),太阳能光伏(SPV)系统和其端口的直流负载。本文建立了考虑的FPC的线性状态空间模型。在该公式中,FPC的小信号建模是在后者的详细模型基础上进行的。获得小信号模型的过程需要对相应的大信号模型进行线性化。最后,比较了FPC状态空间模型的大信号响应和小信号响应。
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