Efficient Single Phase Transformerless Inverter for Grid-Tied PVG System With Reactive Power Control

Islam, Monirul; Afrin, Nadia; Mekhilef, Saad

doi:10.1109/tste.2016.2537365

Cited by 85 publications

(35 citation statements)

References 26 publications

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“…In [3], The voltage control of the busbar at the end of the line, which was selected as the critical busbar in the grid where many PhotoVoltaic (PV) systems were connected, was made by using reactive power and necessary control technique. It was performed reactive power control of a single phase, transformerless, grid connected solar inverter by [4]. In [5], voltage fluctuations in the grid due to solar systems were discussed and this problem was solved by reactive power control.…”

Section: Introductionmentioning

confidence: 99%

Active-Reactive Power Control of Grid-Tied Solar Energy Systems, Using Multi-Parameter Band Control for Grid Voltage Regulation

Tekin¹,

Şekkeli²

2020

ACTA POLYTECH HUNG

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One of the most studied and funded renewable energy sources is solar energy, all over the world. Solar panels are used to obtain electrical energy from the sun. They should be used effectively due to their expensive structure and challenging installation. However, as the sun light only reaches to the earth during daylight hours, solar systems cannot generate active power during the night, or in cases where daylight is not enough, the whole power capacity of the solar inverters have not been used. In this study; it was shown that in addition to the active power generation during the daytime hours, the solar systems were able to generate reactive power with the remaining capacity of the inverter. Thereby adjusting the grid voltage was provided by the solar system's reactive power control. Designed solar system generates completely reactive power at nights. Thus, the efficiency of the solar systems has been increased by ensuring that the solar systems have used to keep the grid voltage within the values, which stated in the standards, by producing reactive power as well as active power. Matlab/Simulink was used to model the system when using hysteresis band method for system control.

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Section: Introductionmentioning

confidence: 99%

Active-Reactive Power Control of Grid-Tied Solar Energy Systems, Using Multi-Parameter Band Control for Grid Voltage Regulation

Tekin¹,

Şekkeli²

2020

ACTA POLYTECH HUNG

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“…However, as defined in international standards (e.g., VDE-AR-N4105), the power factor in power generation systems or units must be adjustable within a range of 0.9 leading to 0.9 lagging [18]. In order to achieve so, various hybrid modulation schemes or novel transformerless topologies have been proposed [17]- [20]. For instance, a new transformerless inverter with a simple modulation method was proposed in [17], where the efficiency has also been increased.…”

Section: Introductionmentioning

confidence: 99%

Hybrid UP-PWM Scheme for HERIC Inverter to Improve Power Quality and Efficiency

Tang

Sun

et al. 2019

IEEE Trans. Power Electron.

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The Highly Efficient and Reliable Inverter Concept (HERIC) inverter is a cost-effective topology, which has low leakage currents and a relatively high efficiency. Thus, it is very suitable for transformerless PV systems. However, with the reported modulation methods, it is difficult to simultaneously maintain the high efficiency, good power quality, and reactive power injection of the HERIC inverter. In this paper, a hybrid unipolar pulse width modulation (UP-PWM) scheme is thus proposed to achieve those performances. The hybrid scheme adopts the conventional UP-PWM in the case of generating the positive power. When generating the negative power, a modulation scheme, which only requires the operation of freewheeling switches, is specifically proposed. Additionally, in the region of the output voltage and current zero-crossing points (ZCP), an UP-PWM with modified dead time is introduced. In order to validate the effectiveness of the proposed scheme, simulations and experiments are performed on a 4-kW HERIC inverter system with a 20-kHz switching frequency. The results demonstrate that the proposed hybrid UP-PWM method achieves a better performance in terms of reactive power injection than the conventional UP-PWM scheme, and a higher efficiency than the UP-PWM with dead time. In addition, the proposed UP-PWM scheme also enables a better power quality.

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“…MOSFET-based topology is developed to improve efficiency, reliability, and inject reactive power. 13 Xiao et al 14 proposed a zero-voltage transition of highly efficient and reliable inverter concept (HERIC) topology in which by integrating freewheeling switches and resonant tank, a small network of resonance is formed. Ahmad et al 15 reviewed different transformerless inverter topologies, and performance comparison of different topologies was performed by total harmonic distortion (THD), efficiency, and device losses.…”

Section: Introductionmentioning

confidence: 99%

Performance assessment of stand‐alone transformerless inverters

Khan

Haque

Kurukuru

2019

Int Trans Electr Energ Syst

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Summary There is a significant improvement in the efficiency and reliability of photovoltaic inverter by using transformerless topologies. But, the issues related to voltage regulation and total harmonic distortion (THD) needs to be addressed deeply. This paper aims to study the performance parameters like voltage regulation, efficiency, and THD of highly efficient transformerless inverters. In addition to this, a modified topology is proposed, which exhibits improved performance while operating with controllers, such as fuzzy and neuro‐fuzzy, are implemented. Simulation is performed using MATLAB. A prototype of the proposed transformerless inverter is also developed in the lab along with the modified control. The proposed topology isolates the photovoltaic (PV) array form the load during the zero‐voltage state. When operated in stand‐alone mode with an intelligent controller, the proposed topology provides benefits with low THD, less power loss, improved voltage regulation, enhanced performance, and efficiency. The result shows an error of 1% in the nominal value of output voltage under varying load and ambient conditions. Settling time is observed to be less than 0.1 seconds for both simulation and prototype. THD is observed at 1.9% for simulation and 2.1% for prototype results, which is better than the previous work.

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Efficient Single Phase Transformerless Inverter for Grid-Tied PVG System With Reactive Power Control

Cited by 85 publications

References 26 publications

Active-Reactive Power Control of Grid-Tied Solar Energy Systems, Using Multi-Parameter Band Control for Grid Voltage Regulation

Active-Reactive Power Control of Grid-Tied Solar Energy Systems, Using Multi-Parameter Band Control for Grid Voltage Regulation

Hybrid UP-PWM Scheme for HERIC Inverter to Improve Power Quality and Efficiency

Performance assessment of stand‐alone transformerless inverters

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