Design and Analysis of Grid Connected Transformerless Solar Inverter

Abstract

Abstract:The design of Transformerless converter concept is developed extensively for the increasing of the efficiency and reliability of the electrical systems which in-turn reduces the major power losses. Consider the conventional inverter where the power from the DC source is initially inverter and then the inverted voltage is boosted using low frequency power transformer. The use of the low frequency transformer increases the cost and size of the system which also increases considerable amount of power loss hence, the necessity of development of a low cost lossless power technology has generated. In photovoltaic applications, transformerless power converter technology is in trend where in, the system is developed such that the output of the solar panel is connected to a single power electronic module which generates the desired output. The modified boost converter uses a couple of inductors at the input side to produce ripple free current without utilization of LC filters. The performance of the modified boost converter has been increased positively with high power conversion capability. The Transformerless grid synchronized photovoltaic system with conventional voltage source inverter may cause electrical safety issue of ground leakage current which is generated using the presence of parasitic capacitance photovoltaic modules and is eliminated using the implementation of bipolar SPWM technology for voltage source inverter. The proposed system is designed and simulated using PSIM.

Power Quality Examination for (250KW) PV Grid-tied Connected at Various Irradiance Levels

“…The inverter has been used from transformerless type. This type is more efficient than the transformer type [6]. Table 2 explains the technical data of the inverter.…”