Transformerless grid connected single phase inverter for power system application

Deepa, R.; Nagashree, A.N.; Anand, K.

doi:10.1109/erect.2015.7499052

Cited by 3 publications

(3 citation statements)

References 7 publications

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“…The spillage current must be controlled to stay away from EMI issue and circuit harm. The fundamental objective of the research work is to control the spillage current by keeping the normal mode voltage steady [16]. This is accomplished by applying unipolar SPWM methodology – basic SPWM procedure and bidirectional SPWM strategy.…”

Section: Literature Reviewmentioning

confidence: 99%

Design and implementation of single‐phase inverter without transformer for PV applications

Kumar

Indragandhi

N³

2018

IET Renewable Power Generation

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For safety purposes, many photovoltaic (PV) systems are designed using galvanic isolation and transformers. The main problem in the existing topologies is that transformers are expensive, heavy and large. Another problem is that at conversion stage, the overall frequency is reduced. The efficiency of a PV inverter which is equipped with a transformer is usually between 91 and 94%. To tackle this issue, a transformerless (TL) PV system is proposed which has high efficiency and is lighter and cheaper. Due to stray capacitance, harmful leakage current will flow to the grid and PV array. H5, HERIC, H6 and oH5 are different types of existing TL inverter, and may be used to solve this problem. Each configuration has its drawbacks like shoot-through issues of switches, high conduction losses, metal-oxide-semiconductor field-effect transistor reverse recovery issues, or to avoid shoot-through fault when dead time requirements and grid voltage are nearly zero. The efficiency of the proposed TL inverter presented in this study is compared with other existing configurations. It shows that the proposed inverter efficiency is better than the conventional hard switching inverters. Moreover, to increase reliability, the inverters do not contain any shoot-through issues.

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Section: Literature Reviewmentioning

confidence: 99%

Design and implementation of single‐phase inverter without transformer for PV applications

Kumar

Indragandhi

N³

2018

IET Renewable Power Generation

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“…This leads to the pursuance of compact designs with wide input voltage ranges and improved overall efficiency such as the transformerless inverters [24]. One of the main drawbacks in transformerless single phase photovoltaic inverter is to control leakage current appearing between parasitic capacitor and ground [25]. To overcome these problems, the main objective of this study is to simulate and construct a high frequency transformer inverter for PV system applications.…”

Section: Introductionmentioning

confidence: 99%

Simulation and Construction of a High Frequency Transformer-Based Inverter for Photovoltaic System Applications

Yusuf

Loko

Abdulhamid³

et al. 2022

JERR

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Aims: To simulate and construct a single phase, pure sine wave inverter using a high frequency transformer. Study Design: Experimental design through simulation studies using pulse width modulation and proportional integral controller. Place and Duration of Study: Department of Physics, Nasarawa State University Keffi, Nigeria, between July 2021 and March 2022. Methodology: Secondary data from Shenzhen EMPTEK EP1100 PRO manufacturer’s datasheets website was utilized for modelling and simulation of the inverter schematic using PSIM version 12.0.3 software. The system consists of DC source-Link, DC-DC converter, VS full bridge with MOSFET driver, LCL filter, HF transformer, and PI controller. The circuit was constructed at a rated power of 1kW and analysis of the inverter output was carried out over a range of steady state loading conditions. Results: A fairly good steady state dynamic response was obtained by the system with an output voltage range of 220V to 224V, output current range of 5.02A to 5.51A; all recorded over a range of loading conditions. The highest inverter efficiency was found to be 97.47% at a load of 0.036Ω, while the power delivered by the inverter at this load was 1049.18W. The lowest value of the efficiency, which was 91.79%, occurred at the lowest load of 0.029Ω, and the output power delivered by the inverter at this load was 1172.53W. Conclusion: The circuit combines the advantage of galvanic isolation and high conversion efficiency which reduces harmonic disturbance resulting from non-linear circuit behavior. The disadvantage of weaker load capacity and impact resistance is greatly improved using the PI controller. It can serve as a good source of alternative power supply for domestic and commercial users especially in Nigeria where the power supply is unstable and unreliable.

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“…In many applications, high-frequency transformers are employed due to the high power density [2]. On the other hand, the transformerless photovoltaic systems have high efficiency and they are cheaper and have a smaller size [3][4][5][6]. The foremost purpose of the transformerless inverter is to maximize efficiency, performance, and reliability as opposed to the other configuration.…”

Section: Introductionmentioning

confidence: 99%

Direct Usage of Photovoltaic Solar Panels to Supply a Freezer Motor with Variable DC Input Voltage

Moghaddam

Bossche

2020

Electronics

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In this paper, a single-phase photovoltaic (PV) inverter fed by a boost converter to supply a freezer motor with variable DC input is investigated. The proposed circuit has two stages. Firstly, the DC output of the PV panel that varies between 150 and 300 V will be applied to the boost converter. The boost converter will boost the input voltage to a fixed 300 V DC. Next, this voltage is supplied to the single-phase full bridge inverter to obtain 230 V AC. In the end, The output of the inverter will feed a freezer motor. The PV panels can be stand-alone or grid-connected. The grid-connected PV is divided into two categories, such as with a transformer and without a transformer, a transformer type has galvanic isolation resulting in increasing the security and also provides no further DC current toward the grid, but it is expensive, heavy and bulky. The transformerless type holds high efficiency and it is cheaper, but it suffers from leakage current between PV and the grid. This paper proposes a stand-alone direct use of PV to supply a freezer; therefore, no grid connection will result in no leakage current between the PV and Grid. The proposed circuit has some features such as no filtering circuit at the output of the inverter, no battery in the system, DC-link instead of AC link that reduces no-loads, having a higher efficiency, and holding enough energy in the DC-link capacitor to get the motor started. The circuit uses no transformers, thus, it is cheaper and has a smaller size. In addition, the system does not require a complex pulse width modulation (PWM) technique, because the motor can operate with a pulsed waveform. The control strategy uses the PWM signal with the desired timing. With this type of square wave, the harmonics (5th and 7th) of the voltage are reduced. The experimental and simulation results are presented to verify the feasibility of the proposed strategy.

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Transformerless grid connected single phase inverter for power system application

Cited by 3 publications

References 7 publications

Design and implementation of single‐phase inverter without transformer for PV applications

Design and implementation of single‐phase inverter without transformer for PV applications

Simulation and Construction of a High Frequency Transformer-Based Inverter for Photovoltaic System Applications

Direct Usage of Photovoltaic Solar Panels to Supply a Freezer Motor with Variable DC Input Voltage

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