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Journal articles on the topic 'Transformerless'

Author: Grafiati

Published: 4 June 2021

Last updated: 12 February 2022

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1

Kahawish Hassan, Turki, and Enaam Abdul Khaliq Ali. "TRANSFORMERLESS PHOTOVOLTAIC MICROINVERTER." Journal of Engineering and Sustainable Development 22, no. 02 (March 1, 2018): 41–55. http://dx.doi.org/10.31272/jeasd.2018.2.66.

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2

Schiebold, Christopher F. "Transformerless audio amplifier." Journal of the Acoustical Society of America 101, no. 1 (January 1997): 20. http://dx.doi.org/10.1121/1.418004.

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3

Bouzguenda, Mounir, Tarek Selmi, Adel Gastli, and Ahmed Masmoudi. "Microcontroller-based inverter topology integrated in PV systems." COMPEL: The International Journal for Computation and Mathematics in Electrical and Electronic Engineering 34, no. 1 (January 5, 2015): 132–50. http://dx.doi.org/10.1108/compel-10-2013-0330.

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Purpose – The purpose of this paper is to study the problem of the leakage currents in transformerless inverter topologies. It proposes a novel topology and how important the adopted control strategy on the power quality produced by the inverter. Design/methodology/approach – The paper presents an investigation of a novel transformerless inverter topology. It adopted a control strategy in which the DC source is disconnected from the inverter when the zero vectors of the control are applied. By using such control strategy, the electrical efficiency of the whole system was improved and the leakage current was significantly reduced. Findings – The paper provides a solution to minimize the leakage current in transformerless inverter topologies. Besides, the problem of zero-crossing distortions was totally eliminated. Research limitations/implications – Because of the high conversion ratio of the boost converter, the efficiency of the whole system needs to be enhanced. Practical implications – The paper includes the experimental results of the proposed topology which are in good match with the simulation results. Originality/value – This paper identifies a need to study the leakage current phenomena in transformerless inverter topologies.

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4

Li, B. H., S. S. Choi, and D. M. Vilathgamuwa. "Transformerless dynamic voltage restorer." IEE Proceedings - Generation, Transmission and Distribution 149, no. 3 (2002): 263. http://dx.doi.org/10.1049/ip-gtd:20020212.

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5

Koffler, R. "Transformer or transformerless UPS?" Power Engineer 17, no. 3 (2003): 34. http://dx.doi.org/10.1049/pe:20030310.

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6

Albalawi, Hani, and Sherif A. Zaid. "Performance Improvement of a Grid-Tied Neutral-Point-Clamped 3-φ Transformerless Inverter Using Model Predictive Control." Processes 7, no. 11 (November 15, 2019): 856. http://dx.doi.org/10.3390/pr7110856.

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Grid-connected photovoltaic (PV) systems are now a common part of the modern power network. A recent development in the topology of these systems is the use of transformerless inverters. Although they are compact, cheap, and efficient, transformerless inverters suffer from chronic leakage current. Various researches have been directed toward evolving their performance and diminishing leakage current. This paper introduces the application of a model predictive control (MPC) algorithm to govern and improve the performance of a grid-tied neutral-point-clamped (NPC) 3-φ transformerless inverter powered by a PV panel. The transformerless inverter was linked to the grid via an inductor/capacitor (LC) filter. The filter elements, as well as the internal impedance of the grid, were considered in the system model. The discrete model of the proposed system was determined, and the algorithm of the MPC controller was established. Matlab’s simulations for the proposed system, controlled by the MPC and the ordinary proportional–integral (PI) current controller with sinusoidal pulse width modulation (SPWM), were carried out. The simulation results showed that the MPC controller had the best performance for earth leakage current, total harmonic distortion (THD), and the grid current spectrum. Also, the efficiency of the system using the MPC was improved compared to that using a PI current controller with SPW modulation.

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7

Yang, Yongheng, Huai Wang, and Frede Blaabjerg. "Reliability Assessment of Transformerless PV Inverters considering Mission Profiles." International Journal of Photoenergy 2015 (2015): 1–10. http://dx.doi.org/10.1155/2015/968269.

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Due to the small volume and high efficiency, transformerless inverters have gained much popularity in grid-connected PV applications, where minimizing leakage current injection is mandatory. This can be achieved by either modifying the modulation schemes or adding extra power switching devices, resulting in an uneven distribution of the power losses on the switching devices. Consequently, the device thermal loading is redistributed and thus may alter the entire inverter reliability performance, especially under a long-term operation. In this consideration, this paper assesses the device reliability of three transformerless inverters under a yearly mission profile (i.e., solar irradiance and ambient temperature). The mission profile is translated to device thermal loading, which is used for lifetime prediction. Comparison results reveal the lifetime mismatches among the power switching devices operating under the same condition, which offers new thoughts for a robust design and a reliable operation of grid-connected transformerless PV inverters with high efficiency.

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8

Vithayathil, J. J., P. E. Bjorklund, and W. Mittlestadt. "DC systems with transformerless converters." IEEE Transactions on Power Delivery 10, no. 3 (July 1995): 1497–504. http://dx.doi.org/10.1109/61.400934.

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9

Park, Jae-Kyu, Jung-Min Kwon, Eung-Ho Kim, and Bong-Hwan Kwon. "High-Performance Transformerless Online UPS." IEEE Transactions on Industrial Electronics 55, no. 8 (August 2008): 2943–53. http://dx.doi.org/10.1109/tie.2008.918606.

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10

Daut, I., M. Irwanto, Y. M. Irwan, N. Gomesh, M. Adzri, and M. Fitra. "High Power Transformerless Photovoltaic Inverter." Energy Procedia 36 (2013): 465–72. http://dx.doi.org/10.1016/j.egypro.2013.07.052.

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11

Yamada, Mai, Sachio Kubota, and Yoshihiro Hatanaka. "Transformerless Inverter for Induction Heating." Journal of the Japan Institute of Power Electronics 45 (2019): 215. http://dx.doi.org/10.5416/jipe.45.215.

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12

Almasoudi, Fahad, and Mohammad Matin. "An Improved Proposed Single Phase Transformerless Inverter with Leakage Current Elimination and Reactive Power Capability for PV Systems Application." Journal of Low Power Electronics and Applications 8, no. 3 (September 6, 2018): 29. http://dx.doi.org/10.3390/jlpea8030029.

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Single-phase transformerless inverters are broadly studied in literature for residential-scale PV applications due to their great advantages in reducing system weight, cost and elevating system efficiency. The design of transformerless inverters is based on the galvanic isolation method to eliminate the generation of leakage current. Unfortunately, the use of the galvanic isolation method alone cannot achieve constant common mode voltage (CMV). Therefore, a complete elimination of leakage current cannot be achieved. In addition, modulation techniques of single-phase transformerless inverters are designed for the application of the unity power factor. Indeed, next-generation PV systems are required to support reactive power to enable connectivity to the utility grid. In this paper, a proposed single-phase transformerless inverter is modified with the clamping method to achieve constant CMV during all inverter operating modes. Furthermore, the modulation technique is modified by creating a new current path in the negative power region. As a result, a bidirectional current path is created in the negative power region to achieve reactive power generation. The simulation results show that the CMV is completely clamped at half the DC link voltage and the leakage current is almost completely eliminated. Furthermore, a reactive power generation is achieved with the modified modulation techniques. Additionally, the total harmonic distortion (THD) of the grid current with the conventional and a modified modulation technique is analyzed. The efficiency of the system is enhanced by using wide-bandgap (WBG) switching devices such as SiC MOSFET. It is observed that the efficiency of the system decreased with reactive power generation due to the bidirectional current path, which leads to increasing conduction losses.

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13

Liu, Wenjie, Kamran Ali Khan Niazi, Tamas Kerekes, and Yongheng Yang. "A Review on Transformerless Step-Up Single-Phase Inverters with Different DC-Link Voltage for Photovoltaic Applications." Energies 12, no. 19 (September 23, 2019): 3626. http://dx.doi.org/10.3390/en12193626.

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Photovoltaic (PV) energy has been competitive in power generation as an alternative to fossil energy resources over the past decades. The installation of grid-connected solar energy systems is expected to increase rapidly with the fast development of the power electronics technology. As the key to the interface of the PV energy and the grid, power converters should be reliable, efficient and comply with the grid requirements. Considering the nature of PV energy, the power conversion should be flexible (e.g., high step-up DC-DC conversion and harmonic-free DC-AC conversion). Accordingly, many power electronic converters have been reported in literature. Compared with isolated inverters, transformerless inverters show great advantages. This paper thus presents an overview of the transformerless step-up single-phase inverters for PV applications based on the dc-link configurations. Grid-connected PV inverters are classified as constant dc-link voltage structures, pseudo-dc-link voltage structures, pulsating dc-link voltage structures and integrated dc-link voltage structures. The discussion on the composition of different dc-link structures is presented, which provides guidance to select appropriate transformerless inverter topologies for PV applications.

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14

Pakdel, M., and S. Jalilzadeh. "A Novel Neutral Point Clamped Full-Bridge Topology for Transformerless Photovoltaic Grid-Connected Inverters." Engineering, Technology & Applied Science Research 7, no. 2 (April 24, 2017): 1460–63. http://dx.doi.org/10.48084/etasr.1010.

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This paper presents a novel neutral point clamped full-bridge topology for transformerless photovoltaic grid-tied inverters. Transformerless grid-connected inverters have been used widely in recent years since they offer higher efficiency and lower costs. Ground leakage current suppression is the main issue which should be considered carefully in transformerless photovoltaic grid-connected inverters. Among different methods used to decline ground leakage current, neutral point clamped (NPC) topologies are considered more useful and effective. In NPC topologies, the short-circuited output voltage at the freewheeling period is clamped to the middle of the DC bus voltage. Therefore, the common-mode voltage (CM) will be constant at the whole switching period. Various NPC topologies such as H6 [1], HB-ZVR [2], oH5 [3], and PN-NPC [4] have been proposed. In this paper, a novel NPC topology is proposed which has lower power losses and higher efficiency over previous topologies. Furthermore, the proposed NPC topology exhibits a similar ground leakage current with the PN-NPC topology. The proposed NPC topology is analyzed theoretically using simulation studies and an experimental prototype is provided to verify theoretical analysis and simulation studies.

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15

Estévez-Bén, Adyr A., Alfredo Alvarez-Diazcomas, Gonzalo Macias-Bobadilla, and Juvenal Rodríguez-Reséndiz. "Leakage Current Reduction in Single-Phase Grid-Connected Inverters—A Review." Applied Sciences 10, no. 7 (March 31, 2020): 2384. http://dx.doi.org/10.3390/app10072384.

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The rise in renewable energy has increased the use of DC/AC converters, which transform the direct current to alternating current. These devices, generally called inverters, are mainly used as an interface between clean energy and the grid. It is estimated that 21% of the global electricity generation capacity from renewable sources is supplied by photovoltaic systems. In these systems, a transformer to ensure grid isolation is used. Nevertheless, the transformer makes the system expensive, heavy, bulky and reduces its efficiency. Therefore, transformerless schemes are used to eliminate the mentioned disadvantages. One of the main drawbacks of transformerless topologies is the presence of a leakage current between the physical earth of the grid and the parasitic capacitances of the photovoltaic module terminals. The leakage current depends on the value of the parasitic capacitances of the panel and the common-mode voltage. At the same time, the common-mode voltage depends on the modulation strategy used. Therefore, by the manipulation of the modulation technique, is accomplished a decrease in the leakage current. However, the connection standards for photovoltaic inverters establish a maximum total harmonic distortion of 5%. In this paper an analysis of the common-mode voltage and its influence on the value of the leakage current is described. 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. A comparative table with the most important aspects of each converter is shown based on number of components, modes of operation, type of modulation strategy used, and the leakage current value obtained. It is important to mention that analyzed topologies present a variation of the leakage current between 0 to 180 mA. Finally, the trends, problems, and researches on transformerless grid-connected PV systems are discussed.

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16

Carmeli, Maria Stefania, Marco Mauri, Luisa Frosio, Alberto Bezzolato, and Gabriele Marchegiani. "Parallel-Connected Photovoltaic Inverters: Zero Frequency Sequence Harmonic Analysis and Solution." International Journal of Emerging Electric Power Systems 14, no. 2 (May 30, 2013): 199–206. http://dx.doi.org/10.1515/ijeeps-2012-0006.

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AbstractHigh-power photovoltaic (PV) plants are usually constituted of the connection of different PV subfields, each of them with its interface transformer. Different solutions have been studied to improve the efficiency of the whole generation system. In particular, transformerless configurations are the more attractive one from efficiency and costs point of view. This paper focuses on transformerless PV configurations characterised by the parallel connection of interface inverters. The problem of zero sequence current due to both the parallel connection and the presence of undesirable parasitic earth capacitances is considered and a solution, which consists of the synchronisation of pulse-width modulation triangular carrier, is proposed and theoretically analysed. The theoretical analysis has been validated through simulation and experimental results.

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17

Salih, Firas S., and Oday A. Ahmed. "Improved Y-Source Single-Stage Transformerless Micro-Inverter for PV Residential Applications." Engineering and Technology Journal 38, no. 9A (September 25, 2020): 1327–41. http://dx.doi.org/10.30684/etj.v38i9a.1143.

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Y-Source Impedance Network (YSN) is one of the most suitable for providing high voltage gain. It generatesa high voltage gain by using a small shoot-through duty cycle, which makes it suitable in applications require a wide range of input voltages such as the Photovoltaic (PV) power plants. However, traditional (YSNs) are unable to boost low voltages in certain applications to the DC-link voltage (about 400V) since it requires a high number of the turns ratio. Higher turns ratio implies higher leakage inductance resulting in higher DC-link voltage spikes. Also, traditional YSNs have high voltage stresses across the components. In this paper, a developed new transformerless Micro-Inverter (MI) is presented that can overcome all the aforementioned drawbacks. The proposed MI has been developed and designed to eliminate both the leakage inductance due to three-winding coupled transformer and leakage current due to using transformerless MI configuration. In addition, the proposed MI reduced the components' stress significantly and increases the converter voltage gain capability in one single-stage. The proposed high boost ratio transformerless MI is analyzed through the PLECS software simulator and implemented in a small scale MI prototype to ensure the results agree with the analysis and simulation results.

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18

Yang, Shuitao, Yang Liu, Xiaorui Wang, Deepak Gunasekaran, Ujjwal Karki, and Fang Z. Peng. "Modulation and Control of Transformerless UPFC." IEEE Transactions on Power Electronics 31, no. 2 (February 2016): 1050–63. http://dx.doi.org/10.1109/tpel.2015.2416331.

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19

Wu, Tsai-Fu. "Decoding and Synthesizing Transformerless PWM Converters." IEEE Transactions on Power Electronics 31, no. 9 (September 2016): 6293–304. http://dx.doi.org/10.1109/tpel.2015.2499784.

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20

Chiang, S. J. "Single-phase three-wire transformerless inverter." IEE Proceedings - Electric Power Applications 141, no. 4 (1994): 197. http://dx.doi.org/10.1049/ip-epa:19941262.

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21

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 (November 1, 2020): 602. http://dx.doi.org/10.11591/ijeecs.v20.i2.pp602-612.

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<p>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.</p>

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22

Li, Jian, Xinxin Guo, and Bo Li. "Robust Fault Diagnosis and Adaptive Parameter Identification for Single Phase Transformerless Inverters." Mathematical Problems in Engineering 2018 (August 13, 2018): 1–11. http://dx.doi.org/10.1155/2018/3025838.

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The paper presents the theoretical analysis and simulation verification of robust fault diagnosis and adaptive parameter identification for single phase transformerless inverters. The fault diagnosis is composed of two parts, fault detection and fault identification. In the fault detection part, a Luenberger observer is designed to realize the detection of faults. Then, we apply a bank of observers to identify the location of faults. Meanwhile, the fault identification observers based estimation along with a gradient descent algorithm are also used in the parameter identification to estimate the actual values of components in a single phase transformerless inverter. Not only we develop the design methodology for the robust fault diagnosis and adaptive parameter identifier but also we present simulation results. The simulation results show the effectiveness of fault diagnosis and the accurate tracking of changes in component parameters for a wide range.

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23

Yoshii, Tsurugi, Shigenori Inoue, and Hirofumi Akagi. "A 6.6-kV Transformerless Cascade PWM STATCOM." IEEJ Transactions on Industry Applications 127, no. 8 (2007): 781–88. http://dx.doi.org/10.1541/ieejias.127.781.

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24

Cui, Wenfeng, Haoze Luo, Yunjie Gu, Wuhua Li, Bo Yang, and Xiangning He. "Hybrid‐bridge transformerless photovoltaic grid‐connected inverter." IET Power Electronics 8, no. 3 (March 2015): 439–46. http://dx.doi.org/10.1049/iet-pel.2013.0785.

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25

Tey, Kok Soon, and Saad Mekhilef. "A reduced leakage current transformerless photovoltaic inverter." Renewable Energy 86 (February 2016): 1103–12. http://dx.doi.org/10.1016/j.renene.2015.09.039.

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26

Vazquez, Nimrod, Marco Rosas, Claudia Hernandez, Esli Vazquez, and Francisco J. Perez-Pinal. "A New Common-Mode Transformerless Photovoltaic Inverter." IEEE Transactions on Industrial Electronics 62, no. 10 (October 2015): 6381–91. http://dx.doi.org/10.1109/tie.2015.2426146.

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27

Gonzalez, R., J. Lopez, P. Sanchis, and L. Marroyo. "Transformerless Inverter for Single-Phase Photovoltaic Systems." IEEE Transactions on Power Electronics 22, no. 2 (March 2007): 693–97. http://dx.doi.org/10.1109/tpel.2007.892120.

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28

Xiao, Huafeng. "Overview of Transformerless Photovoltaic Grid-Connected Inverters." IEEE Transactions on Power Electronics 36, no. 1 (January 2021): 533–48. http://dx.doi.org/10.1109/tpel.2020.3003721.

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29

Gonzalez, Roberto, Eugenio Gubia, JesÚs Lopez, and Luis Marroyo. "Transformerless Single-Phase Multilevel-Based Photovoltaic Inverter." IEEE Transactions on Industrial Electronics 55, no. 7 (July 2008): 2694–702. http://dx.doi.org/10.1109/tie.2008.924015.

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30

Xiao, Huafeng, Shaojun Xie, Yang Chen, and Ruhai Huang. "An Optimized Transformerless Photovoltaic Grid-Connected Inverter." IEEE Transactions on Industrial Electronics 58, no. 5 (May 2011): 1887–95. http://dx.doi.org/10.1109/tie.2010.2054056.

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31

Syed, Ahmad, and S. Tara Kalyani. "Evaluation of Single Phase Transformerless Photovoltaic Inverters." Electrical and Electronics Engineering: An International Journal 4, no. 2 (May 31, 2015): 25–39. http://dx.doi.org/10.14810/elelij.2015.4203.

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32

Lazzarin, Telles, Neilor Pont, and Gierri Waltrich. "Transformerless Step-up Inverter Based On Switched-capacitor Converter Technology." Eletrônica de Potência 22, no. 3 (September 1, 2017): 269–78. http://dx.doi.org/10.18618/rep.2017.3.2685.

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33

Albalawi, Hani, and Sherif Zaid. "An H5 Transformerless Inverter for Grid Connected PV Systems with Improved Utilization Factor and a Simple Maximum Power Point Algorithm." Energies 11, no. 11 (October 25, 2018): 2912. http://dx.doi.org/10.3390/en11112912.

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Due to their small size, minimum cost, and great efficiency, photovoltaic (PV) grid-connected transformerless inverters have been developed and become famous around the world in distributed PV generators systems. One of the most efficient topologies of the transformerless inverter family is H5 topology. This inverter extracts a discontinuous current from the PV panel, which conflicts with the operation at maximum power point tracking (MPPT) conditions while the utilization factor of the PV degrades. This paper proposes improved H5 topology featuring a boost converter inserted in the middle between the PV panels and the H5 inverter. The design of the boost converter is planned to operate at continuous conduction mode to guarantee MPPT conditions of the PV. A new and simple off line MPPT algorithm is introduced and performance factors like efficiency and utilization factors of the proposed and convention H5 topology are compared. The simulation results indicate that the proposed system provides a preferable utilization factor and a simpler MPPT algorithm.

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34

R. Reinert, Marcos, Jonathan Dômini Sperb, Marcello Mezaroba, Cassiano Rech, and Leandro Michels. "Transformerless Doubleconversion Ups Using A Regenerative Snubber Circuit." Eletrônica de Potência 16, no. 2 (May 1, 2011): 158–67. http://dx.doi.org/10.18618/rep.2011.2.158167.

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35

Stemmler, Herbert, Andreas Beer, and Hideo Okayama. "Transformerless Reactive Series Compensators with Voltage Source Inverters." IEEJ Transactions on Industry Applications 118, no. 10 (1998): 1165–71. http://dx.doi.org/10.1541/ieejias.118.1165.

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36

Wang, Dan, Jiawei Yang, Zhu Chen, Chengxiong Mao, and Jiming Lu. "A Transformerless Medium Voltage Multiphase Motor Drive System." Energies 9, no. 5 (April 27, 2016): 323. http://dx.doi.org/10.3390/en9050323.

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37

Barater, Davide, Emilio Lorenzani, Carlo Concari, Giovanni Franceschini, and Giampaolo Buticchi. "Recent advances in single-phase transformerless photovoltaic inverters." IET Renewable Power Generation 10, no. 2 (February 1, 2016): 260–73. http://dx.doi.org/10.1049/iet-rpg.2015.0101.

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38

Revathi B., Sri, and Mahalingam Prabhakar. "Transformerless high‐gain DC–DC converter for microgrids." IET Power Electronics 9, no. 6 (May 2016): 1170–79. http://dx.doi.org/10.1049/iet-pel.2015.0406.

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39

Kumar, Chandan, and Mahesh K. Mishra. "Predictive Voltage Control of Transformerless Dynamic Voltage Restorer." IEEE Transactions on Industrial Electronics 62, no. 5 (May 2015): 2693–97. http://dx.doi.org/10.1109/tie.2014.2365753.

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40

Mathew, Derick, and Rani Chinnappa Naidu. "Investigation of single‐stage transformerless buck–boost microinverters." IET Power Electronics 13, no. 8 (June 2020): 1487–99. http://dx.doi.org/10.1049/iet-pel.2019.1237.

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41

López, Óscar, Francisco D. Freijedo, Alejandro G. Yepes, Pablo Fernández-Comesaña, Jano Malvar, Remus Teodorescu, and Jesús Doval-Gandoy. "Eliminating Ground Current in a Transformerless Photovoltaic Application." IEEE Transactions on Energy Conversion 25, no. 1 (March 2010): 140–47. http://dx.doi.org/10.1109/tec.2009.2037810.

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42

Saridakis, Stefanos, Eftichios Koutroulis, and Frede Blaabjerg. "Optimal Design of Modern Transformerless PV Inverter Topologies." IEEE Transactions on Energy Conversion 28, no. 2 (June 2013): 394–404. http://dx.doi.org/10.1109/tec.2013.2252013.

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43

Vaidya, Harshal D. "TRANSFORMERLESS DOUBLE BOOST CONVERTER FOR NONCONVENTIONAL ENERGY APPLICATION." International Journal of Research in Engineering and Technology 06, no. 08 (August 15, 2017): 93–97. http://dx.doi.org/10.15623/ijret.2017.0608014.

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44

Li Zhang, Kai Sun, Yan Xing, and Mu Xing. "H6 Transformerless Full-Bridge PV Grid-Tied Inverters." IEEE Transactions on Power Electronics 29, no. 3 (March 2014): 1229–38. http://dx.doi.org/10.1109/tpel.2013.2260178.

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45

Al-Rawi, N. A., M. M. Al-Kaisi, and A. K. Hassen. "Load independent efficient, transformerless inverter for photovoltaic applications." International Journal of Energy Research 13, no. 5 (1989): 595–603. http://dx.doi.org/10.1002/er.4440130511.

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46

Banaei, Mohamad Reza, and Hossein Ajdar Faeghi Bonab. "High-efficiency transformerless buck-boost DC-DC converter." International Journal of Circuit Theory and Applications 45, no. 8 (January 2, 2017): 1129–50. http://dx.doi.org/10.1002/cta.2310.

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47

Gubía, Eugenio, Pablo Sanchis, Alfredo Ursúa, Jesús López, and Luis Marroyo. "Ground currents in single-phase transformerless photovoltaic systems." Progress in Photovoltaics: Research and Applications 15, no. 7 (2007): 629–50. http://dx.doi.org/10.1002/pip.761.

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48

Kerekes, Tamas, Remus Teodorescu, Marco Liserre, Christian Klumpner, and Mark Sumner. "Evaluation of Three-Phase Transformerless Photovoltaic Inverter Topologies." IEEE Transactions on Power Electronics 24, no. 9 (September 2009): 2202–11. http://dx.doi.org/10.1109/tpel.2009.2020800.

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49

Akpinar, E., and I. Yilmazlar. "Transformerless Single Phase Inverter Design for LCD Television." IEEE Transactions on Consumer Electronics 53, no. 2 (2007): 697–703. http://dx.doi.org/10.1109/tce.2007.381748.

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Khan, Ashraf Ali, Yun W. Lu, Usman Ali Khan, Liwei Wang, Wilson Eberle, and Mohammed Agamy. "Novel Transformerless Buck–Boost Inverters Without Leakage Current." IEEE Transactions on Industrial Electronics 67, no. 12 (December 2020): 10442–54. http://dx.doi.org/10.1109/tie.2019.2962478.

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