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Journal articles on the topic 'HERIC transformerless inverter'

Author: Grafiati

Published: 5 June 2025

Last updated: 15 July 2025

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Janardhan, G., N. N. V. Surendra Babu, and G. N. Srinivas. "Single phase transformerless inverter for grid connected photovoltaic system with reduced leakage current." Electrical Engineering & Electromechanics, no. 5 (September 6, 2022): 36–40. http://dx.doi.org/10.20998/2074-272x.2022.5.06.

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Introduction. Transformerless inverters are of vital importance in the field of grid connected solar photovoltaic systems offering higher efficiency than the conventional one. i.e., using transformer. General grid connected inverters are constituting of transformers requires more area besides the loss in them. Problem. Eliminating transformers can cause leakage current due to the variation of common mode voltage which in turn due to parasitic capacitance effect. Research literature in transformerless inverters has addressed the problems of common mode leakage current issues by offering the study of different inverter topologies like H4, H5, H6 and HERIC etc. utilizing variety of modulation strategies like unipolar, bipolar pulse width modulations. Goal. The paper significantly presents a new transformerless inverter topology, analyzes common mode voltage and leakage current behavior of the system. The simulation is carried out for comparing the leakage current profiles with other transformerless inverter topologies in literature. Novelty. This paper gives an impression of the efficient transformerless inverter for grid connected photovoltaic system. Results. The various inverter topologies full bridge with different pulse width modulation techniques are analyzed and to determine the common mode voltages and leakage currents.

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G., Janardhan, N. V. Surendra Babu N., and N. Srinivas G. "Single phase transformerless inverter for grid connected photovoltaic system with reduced leakage current." Electrical Engineering & Electromechanics, no. 5 (September 7, 2022): 36–40. https://doi.org/10.20998/2074-272X.2022.5.06.

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Introduction. Transformerless inverters are of vital importance in the field of grid connected solar photovoltaic systems offering higher efficiency than the conventional one. i.e., using transformer. General grid connected inverters are constituting of transformers requires more area besides the loss in them.  Problem. Eliminating transformers can cause leakage current due to the variation of common mode voltage which in turn due to parasitic capacitance effect. Research literature in transformerless inverters has addressed the problems of common mode leakage current issues by offering the study of different inverter topologies like H4, H5, H6 and HERIC etc. utilizing variety of modulation strategies like unipolar, bipolar pulse width modulations. Goal. The paper significantly presents a new transformerless inverter topology, analyzes common mode voltage and leakage current behavior of the system. The simulation is carried out for comparing the leakage current profiles with other transformerless inverter topologies in literature. Novelty. This paper gives an impression of the efficient transformerless inverter for grid connected photovoltaic system. Results. The various inverter topologies full bridge with different pulse width modulation techniques are analyzed and to determine the common mode voltages and leakage currents.

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Hendawi, Essam. "A high performance grid connected PV system based on HERIC transformerless inverter." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 2 (2020): 602. http://dx.doi.org/10.11591/ijeecs.v20.i2.pp602-612.

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This paper presents an effective single phase grid connected photovoltaic PV system based on High Efficiency and Reliable Inverter Concept HERIC transformerless inverter. dc-dc boost converter controlled by incremental conductance IC maximum power point tracker MPPT is employed to achieve the maximum extraction power of the PV panels. Proportional integral PI controller controls the output voltage of the boost converter to meet the utility grid requirements. LCL filter is utilized to keep the inverter voltage very close to sinusoidal shape. Employing the HERIC transformerless inverter reduces significantly the ground leakage current beyond safe limits. Semiconductors losses are studied to investigate the efficiency of the proposed system at different insolation levels. Simulation results verify the high performance of the proposed system when considering leakage current and system efficiency.

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Essam, Hendawi. "A high performance grid connected PV system based on HERIC transformerless inverter." Indonesian Journal of Electrical Engineering and Computer Science 20, no. 2 (2020): 602–12. https://doi.org/10.11591/ijeecs.v20.i2.pp602-612.

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This paper presents an effective single phase grid connected photovoltaic PV system based on High Efficiency and Reliable Inverter Concept HERIC transformerless inverter. dc-dc boost converter controlled by incremental conductance IC maximum power point tracker MPPT is employed to achieve the maximum extraction power of the PV panels. Proportional integral PI controller controls the output voltage of the boost converter to meet the utility grid requirements. LCL filter is utilized to keep the inverter voltage very close to sinusoidal shape. Employing the HERIC transformerless inverter reduces significantly the ground leakage current beyond safe limits. Semiconductors losses are studied to investigate the efficiency of the proposed system at different insolation levels. Simulation results verify the high performance of the proposed system when considering leakage current and system efficiency.

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Kołodziejski, Wojciech, Jacek Jasielski, Stanisław W. Kuta, Grzegorz Szerszeń, and Witold Machowski. "Review and comparison of methods for limiting leakage currents in single-phase transformerless PV inverter topologies." Science, Technology and Innovation 16, no. 3-4 (2023): 1–19. http://dx.doi.org/10.55225/sti.477.

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Transformerless inverters are widely used in different photovoltaic nonisolated ac module applications, mainly in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency over a wide load range, and low cost. Various transformerless inverter topologies have been proposed to meet the safety requirement of low ground leakage currents, such as specified in the VDE-4105 standard and low-output ac-current distortion. Topology modifications of transformerless full bridge inverters are designed to balance and maintain a constant common mode output voltage, thereby eliminating or reducing leakage currents. This article reviews and compares the different methods for limiting leakage currents in known topologies of the full-bridge transformerless inverters, such as: H4, H5, H6, HERIC, and their improvements. The main topologies and strategies used to reduce the leakage current in transformerless schemes are summarized, highlighting advantages and disadvantages and establishing points of comparison with similar topologies. To compare the properties of different medium to high power inverters, PV inverter topologies were implemented using IGBTs and tested with the same components, same simulation parameters in PSPICE to evaluate their performance in terms of energy efficiency and leakage current characteristics. The detailed power stage operating principles, extended PWM modulator, and integrated universal gate driver with galvanic isolation in the transmission path of control signal for all IGBTs of the inverter, as well isolated and floating bias power supply for gate drivers are described.

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Khoun Jahan, Hossein, Nima Abdolmaleki, Mohammad Ahmadpour, et al. "A Reconfigurable Fault-Tolerant PV Inverter via Integrating HERIC and H5 Topologies." Energies 15, no. 9 (2022): 3403. http://dx.doi.org/10.3390/en15093403.

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Solar energy is prevalent in many applications, therefore, the reliability of solar energy systems has become an important topic for research communities and industry. High reliability and fault-tolerant capability are particularly vital for the solar energy systems that are mission-critical and/or inaccessible to affordable maintenance. In order to enhance the reliability of a grid-tied PV system, a fault-tolerant Photovoltaic (PV) inverter, termed Integrated Fault-Tolerant PV Inverter (IFTPVI), is proposed in this paper. The IFTPVI is based on the Highly Efficient and Reliable Inverter Concept (HERIC) and H5 inverters that are both popular and commercialized transformerless inverters in grid-tied PV applications. The IFTPVI can tolerate both open-circuit (OC) and short-circuit (SC) faults while maintaining the same voltage and current levels. The system description, reliability analysis, simulation in Matlab/Simulink 2018, and experimental results are provided to verify the feasibility and viability of the proposed inverter topology.

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Lamreoua, Abdelhak, Benslimane Anas, Jamal Bouchnaif, and El Ouariachi Mostafa. "Single-phase transformerless inverter topologies at different levels for a photovoltaic system, with proportional resonant controller." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 2 (2023): 1410–22. https://doi.org/10.11591/ijece.v13i2.pp1410-1422.

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In this paper, we have studied the topologies of single-phase transformerless inverters with different levels using a proportional-integral-resonant (PIR) AC controller, and the multi-level cascade inverter topology with sinusoidal pulse with modulation (SPWM) control in an open and closed loop. To ensure that these photovoltaic inverters can inject a defined amount of reactive power into the grid according to international regulations. Therefore, precise monitoring of the mains voltage vector by a phase-locked loop (PLL) system is applied to ensure the proper functioning of this system. For inverter topologies with less than three levels, the simulation results show that the highly efficient and reliable inverter concept (HERIC) topology performance is better than that of H5 and H6. On the other hand, the performance of the topology H6 ameliorate is superior to those of H4, H5, and HERIC in currents of leakage. On the other hand, for the control of cascaded multi-level closed-loop inverters, we notice that there is an improvement in the spectra and the elimination of all frequency harmonics, close to that of the fundamental, and a reduction in the rate of harmonic current distortion.

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Abdelhak, Lamreoua, Anas Benslimane, Bouchnaif Jamal, and Mostafa El Ouariachi. "Single-phase transformerless inverter topologies at different levels for a photovoltaic system, with proportional resonant controller." International Journal of Electrical and Computer Engineering (IJECE) 13, no. 2 (2023): 1410. http://dx.doi.org/10.11591/ijece.v13i2.pp1410-1422.

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In this paper, we have studied the topologies of single-phase transformerless inverters with different levels using a <a name="_Hlk115945664"></a>proportional-integral-resonant (PIR) AC controller, and the multi-level cascade inverter topology with sinusoidal pulse with modulation (SPWM) control in an open and closed loop. To ensure that these photovoltaic inverters can inject a defined amount of reactive power into the grid according to international regulations. Therefore, precise monitoring of the mains voltage vector by a phase-locked loop (PLL) system is applied to ensure the proper functioning of this system. For inverter topologies with less than three levels, the simulation results show that the highly efficient and reliable inverter concept (HERIC) topology performance is better than that of H5 and H6. On the other hand, the performance of the topology H6 ameliorate is superior to those of H4, H5, and HERIC in currents of leakage. On the other hand, for the control of cascaded multi-level closed-loop inverters, we notice that there is an improvement in the spectra and the elimination of all frequency harmonics, close to that of the fundamental, and a reduction in the rate of harmonic current distortion.

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Xiao, Hua F., Li Zhang, and Yanqing Li. "A Zero-Voltage-Transition HERIC-Type Transformerless Photovoltaic Grid-Connected Inverter." IEEE Transactions on Industrial Electronics 64, no. 2 (2017): 1222–32. http://dx.doi.org/10.1109/tie.2016.2611574.

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Zhang, Chun Long. "Research on Control Method of Grid-Connected Inverter Suppressing Grid-Voltage Background Harmonics." Advanced Materials Research 787 (September 2013): 861–66. http://dx.doi.org/10.4028/www.scientific.net/amr.787.861.

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The traditional LCL-filter third-order system grid-connected inverter may cause the resonance phenomenon without damping. Also, it will be affected by the distorted grid-voltage background harmonics. In order to overcome these problems, based on the passive damping method, a new control strategy is proposed. The paper analyses the current waveform performance of grid-connected inverter in the condition of grid-voltage background harmonics, derives the feed-forward function for grid-connected inverter. The disadvantages of passive damping could be well solved by damping resistor virtualization of the original system, which realized the active damping suppression of resonance. Simulation results based on the Heric single-phase transformerless grid-connected inverter verify the correctness of the 2éQ: theoretical analysis"theoretical analysis.

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Kumar, Kuncham Sateesh, Annamalai Kirubakaran, and N. Subrahmanyam. "Bidirectional Clamping-Based H5, HERIC, and H6 Transformerless Inverter Topologies With Reactive Power Capability." IEEE Transactions on Industry Applications 56, no. 5 (2020): 5119–28. http://dx.doi.org/10.1109/tia.2020.2999552.

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A, Balamurugan, and Ilyaraja V.K. "A Transformerless Single-phase Symmetrical Z- source Soft Switching Heric Inverter with Reduced Leakage Currents." Journal of Advanced Research in Dynamical and Control Systems 12, no. 5 (2020): 267–73. http://dx.doi.org/10.5373/jardcs/v12i5/20201713.

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Yue, Xiumei, Hongliang Wang, Xiaonan Zhu, Xinwei Wei, and Yan-Fei Liu. "A Topology Synthetization Method for Single-Phase, Full-Bridge, Transformerless Inverter with Leakage Current Suppression Part I." Energies 13, no. 2 (2020): 434. http://dx.doi.org/10.3390/en13020434.

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Single-phase full-bridge transformerless topologies, such as the H5, H6, or the highly efficient and reliable inverter concept (HERIC) topologies, are commonly used for leakage current suppression for photovoltaic (PV) applications. The main derivation methodology of full-bridge topologies has been used based on both a DC-based decoupling model and an AC-based decoupling model. However, this methodology is not suited to the search for all possible topologies, and cannot verify whether they are inclusive. Part I of this paper will propose a new topology derivation methodology based on unipolar sinusoidal pulse width modulation (USPWM) to search all possible full-bridge topologies for leakage current suppression. First of all, a unified circuit model is proposed, instead of the DC- and AC-based models. Secondly, a mathematic method called the MN principle is then proposed to search for all possible topologies, and a derivation procedure is provided. It was verified that all existing topologies could be found using the proposed method; furthermore, seven new topologies were derived. The proposed topology derivation methodology is extended to search topologies under Double-Frequency USPWM (DFUSPWM). Twenty topologies under USPWM and four topologies under DFUSPWM have been derived.

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Su, Li. "The topology-based approach to leakage current suppression on transformerless photovoltaic inverters." Journal of Physics: Conference Series 2479, no. 1 (2023): 012021. http://dx.doi.org/10.1088/1742-6596/2479/1/012021.

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Abstract With the increase in demand for renewable energy, photovoltaic power generation is gradually becoming the most promising new energy source. However, the electrical connection of PV cells to the grid, and parasitic capacitance between the PV cell and the ground can introduce severe leakage currents into the grid. The scientific community has developed various topology-based techniques to suppress leakage currents. This paper is dedicated to a review of these techniques. Firstly the H5, HERIC, FB-DCBP, oH5, H8, and H6 are analyzed. These techniques are then reviewed more fully in terms of quality, efficiency, size, and complexity. All six of these topologies can meet the requirements for leakage current suppression, and there is an increasing trend toward reducing the size and simplifying topologies. Finally, future trends in topology-based techniques for suppressing leakage currents are predicted. The significance of this paper is that it provides a comprehensive review and summary of the various topology-based techniques for suppressing leakage currents.

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Barade, Suraj, and Sneha Tibude. "Comparative Analysis Deferent Topologies for Photovoltaic Based Grid-Tied Transformerless Inverters." International Journal of Advanced Research in Science, Communication and Technology, August 8, 2021, 171–79. http://dx.doi.org/10.48175/ijarsct1820.

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Transformerless inverters are widely used in grid-tied photovoltaic (PV) generation systems, due to the benefits of achieving high efficiency and low cost. Various transformer less inverter topologies have been proposed to meet the safety requirement of leakage currents. In this paper, a family of H6 transformer less inverter topologies with low leakage currents is proposed, and the intrinsic relationship between H5 topology, highly efficient and reliable inverter concept (HERIC) topology, and the proposed H6 topology has been discussed as well. One of the proposed H6 inverter topologies is taken as an example for detail analysis with operation modes and modulation strategy. The power losses and power device costs are compared among the H5, the HERIC, and the proposed H6 topologies. A universal prototype is built for these three topologies mentioned for evaluating their performances in terms of power efficiency and leakage currents characteristics. Experimental results show that the proposed H6 topology and the HERIC achieve similar performance in leakage currents, which is slightly worse than that of the H5 topology, but it features higher efficiency than that of H5 topology.

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L., Ashok Kumar, and Sujith Kumar N. "Design and Analysis of Highly Efficient and Reliable Single-Phase Transformerless Inverter for PV Systems." August 4, 2014. https://doi.org/10.5281/zenodo.1094633.

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Most of the PV systems are designed with transformer for safety purpose with galvanic isolation. However, the transformer is big, heavy and expensive. Also, it reduces the overall frequency of the conversion stage. Generally PV inverter with transformer is having efficiency around 92%–94% only. To overcome these problems, transformerless PV system is introduced. It is smaller, lighter, cheaper and higher in efficiency. However, dangerous leakage current will flow between PV array and the grid due to the stray capacitance. There are different types of configurations available for transformerless inverters like H5, H6, HERIC, oH5, and Dual paralleled buck inverter. But each configuration is suffering from its own disadvantages like high conduction losses, shoot-through issues of switches, dead-time requirements at zero crossing instants of grid voltage to avoid grid shoot-through faults and MOSFET reverse recovery issues. The main objective of the proposed transformerless inverter is to address two key issues: One key issue for a transformerless inverter is that it is necessary to achieve high efficiency compared to other existing inverter topologies. Another key issue is that the inverter configuration should not have any shoot-through issues for higher reliability.

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L., Ashok Kumar, and Sujith Kumar N. "Design and Analysis of Highly Efficient and Reliable Single-Phase Transformerless Inverter for PV Systems." International Journal of Energy and Environmental Engineering 8.0, no. 9 (2014). https://doi.org/10.5281/zenodo.2660519.

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Alam, Md Aftab, S. V. A. V. Prasad, and Mohammed Asim. "Performance Analysis of different Transformer-less Inverter Topologies for Grid-Connected PV Systems." Engineering Research Express, August 30, 2023. http://dx.doi.org/10.1088/2631-8695/acf549.

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Abstract Transformerless Photovoltaic (PV) inverters are gaining popularity compared to their transformer-based counterparts. They are more efficient, cost-effective, and smaller in volume. Despite this, parasitic capacitance causes the common mode current to flow between the PV array and the grid. In addition to losses, leakage current increases electromagnetic interference (EMI) and poses issues to the protection system. Transformerless inverters should therefore be so designed that the leakage current is minimized. Common mode voltage changes (VCM) cause the leakage current. There are a number of PV inverter topologies that have been designed to minimize these variations. This paper discusses H4, H5 and HERIC single-phase PV inverter topologies. Circuit simulations have been used for analysis. HERIC Topology is the best one of these since it reduces the leakage current with the lowest power loss due to ac bypass instead of usual dc side decoupling. It is a type of resonant converter that operates at high frequencies to achieve efficient power conversion. In this work, comparison has been made between topologies for their effectiveness in reducing leakage current. Moreover, its variation with load has been studied, a perspective missed in other studies.

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Chen, Zhigang, Yamei Wang, Liyong Yang, Shuo Liu, Chaonan Tong, and Yongchao Lv. "Analysis and control of single‐phase transformerless dual‐frequency grid‐connected inverter." International Journal of Circuit Theory and Applications, August 31, 2023. http://dx.doi.org/10.1002/cta.3787.

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SummaryTo simplify the inverter topology and suppress the leakage current more effectively, a novel transformerless dual‐frequency grid‐connected inverter with a common direct current (DC) bus is proposed. The proposed inverter retains the advantages of the traditional dual‐frequency inverter such as high efficiency and absence of resonance. In the novel topology, the power unit adopts the highly efficient reliable inverter concept (HERIC) topology with a unipolar modulation strategy, and the auxiliary unit adopts the H‐bridge topology with a bipolar modulation strategy. It is verified that the circulating current between the two units can be eliminated in the proposed inverter. The sensitivity of the circulating current is discussed by considering the tolerance of the filter inductances. In the leakage current equivalent circuit, the DC bus of the power unit is connected to the grid through a low‐impedance branch in parallel with the parasitic capacitance. Therefore, the leakage current is effectively suppressed. Finally, the experimental results are provided to verify the performance of the inverter.

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"A TRANSFORMERLESS GRID CONNECTED TO PV SYSTEM BASED ON HERIC INVERTER." Journal of critical reviews 7, no. 09 (2020). http://dx.doi.org/10.31838/jcr.07.09.145.

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"AN OVERVIEW OF 1-PHASE TRANSFORMERLESS HERIC INVERTER TOPOLOGY FOR STANDALONE SYSTEM." International Journal of Advance Engineering and Research Development 3, no. 12 (2016). http://dx.doi.org/10.21090/ijaerd.031217.

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