Comparative Study of Different Transformer-less Inverter Topologies for Grid-tied Photovoltaic System

2019 5th International Conference on Advances in Electrical Engineering (ICAEE) Pub Date : 2019-09-01 DOI:10.1109/icaee48663.2019.8975675

A. Saha, Shameem Ahmad, S. Mekhilef, Umme Kulsum Jhuma, Haidar Islam, Zahirul Amin Chowdhury, Monirul Islam

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引用次数: 9

Abstract

Lately, interest is developing significantly on transformerless photovoltaic (PV) inverter for its small size, low cost and high efficiency compared to the inverter which has transformer. Different topologies of transformerless inverters are stated in the literature based on the leakage current characteristics. In this paper five different topologies of transformerless inverters (H5, H6, HERIC, Modified H6, OH5) have been selected for analysis. For controlling the grid current and voltage of the DC link a common controller for all the topologies has been designed based on PI controller and SPWM technique. These two techniques have been used to generate the switching pulses for the inverter switches. The simulation of all the five topologies are conducted in MATLAB/SIMULINK environment and analysis has been done. Finally, based on that a comparative study has been obtained based on the component ratings, leakage current, maximum efficiency and components number to determine a better topology for real world operation.

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并网光伏系统不同无变压器逆变器拓扑结构的比较研究

近年来，与带变压器的逆变器相比，无变压器光伏逆变器具有体积小、成本低、效率高等优点，引起了人们的极大兴趣。不同的拓扑结构的无变压器逆变器在文献中阐述了基于泄漏电流特性。本文选取了五种不同拓扑结构的无变压器逆变器(H5, H6, HERIC, Modified H6, OH5)进行分析。为了控制直流链路的电网电流和电压，基于PI控制器和SPWM技术设计了一种适用于所有拓扑结构的通用控制器。这两种技术已被用于产生逆变器开关的开关脉冲。在MATLAB/SIMULINK环境中对这五种拓扑结构进行了仿真并进行了分析。最后，在此基础上，根据元件额定值、漏电流、最大效率和元件数量进行了比较研究，以确定更适合实际运行的拓扑结构。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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2019 5th International Conference on Advances in Electrical Engineering (ICAEE)

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