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Two-stage off-grid system for catering household AC appliances with reduced switches
IET Power Electronics ( IF 2 ) Pub Date : 2020-11-30 , DOI: 10.1049/iet-pel.2020.0262
Amal C. Sunny 1 , Dipankar Debnath 1
Affiliation  

This study presents a solar photovoltaic (PV)-battery-integrated multi-input converter (PBMIC) based two-stage off-grid system for catering household ac appliances in areas where the grid is not available. The proposed single-stage PBMIC facilitates the control of both PV array and the battery along with adequate voltage boosting by employing only two controlled switches. This reduces cost for semiconductor devices along with associated accessories and also reduces a number of power converter stages required for the overall system. Owing to the adequate voltage boosting capability, the proposed system facilitates the use of low-voltage levels for both PV and battery, thereby eliminating the problems associated with the series connection of multiple units of them. The topological configuration of the PBMIC under different modes of operation is analysed. Furthermore, a novel control scheme that allows the converter to operate in various modes necessary for an off-grid system along with a seamless transition between these modes is also devised. A 400 W prototype of the complete off-grid system formed by connecting a full-bridge dc–ac inverter at the output of PBMIC is fabricated for conducting experimental studies. The validity of the complete system is substantiated by comprehensive simulation and experimental performance.

中文翻译:

两级离网系统,用于减少开关的餐饮家用交流电器

这项研究提出了一种基于太阳能光伏(PV)-电池集成的多输入转换器(PBMIC)的两级离网系统,用于在电网不可用的地区为家用电器提供餐饮服务。所提出的单级PBMIC通过仅使用两个受控开关来促进对PV阵列和电池的控制以及足够的升压。这降低了半导体器件及其相关附件的成本,还减少了整个系统所需的功率转换器级数。由于具有足够的升压能力,因此所提出的系统有助于对PV和电池使用低电压水平,从而消除了与它们的多个单元串联连接相关的问题。分析了PBMIC在不同操作模式下的拓扑结构。此外,还设计了一种新颖的控制方案,该方案允许转换器以离网系统所需的各种模式以及这些模式之间的无缝过渡进行操作。通过在PBMIC的输出端连接全桥dc-ac逆变器而形成的完整离网系统的400 W原型,用于进行实验研究。全面的仿真和实验性能证明了整个系统的有效性。通过在PBMIC的输出端连接全桥dc-ac逆变器而形成的完整离网系统的400 W原型,用于进行实验研究。全面的仿真和实验性能证明了整个系统的有效性。通过在PBMIC的输出端连接全桥dc-ac逆变器而形成的完整离网系统的400 W原型,用于进行实验研究。全面的仿真和实验性能证明了整个系统的有效性。
更新日期:2020-12-01
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