Journal articles: 'Transformerless solar inverters'

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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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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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Zeb, Kamran, Imran Khan, Waqar Uddin, Muhammad Adil Khan, P. Sathishkumar, Tiago Davi Curi Busarello, Iftikhar Ahmad, and H. J. Kim. "A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems." Energies 11, no. 8 (July 28, 2018): 1968. http://dx.doi.org/10.3390/en11081968.

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The research significance of various scientific aspects of photovoltaic (PV) systems has increased over the past decade. Grid-tied inverters the vital elements for the effective interface of Renewable Energy Resources (RER) and utility in the distributed generation system. Currently, Single-Phase Transformerless Grid-Connected Photovoltaic (SPTG-CPV) inverters (1–10 kW) are undergoing further developments, with new designs, and interest of the solar market. In comparison to the transformer (TR) Galvanic Isolation (GI)-based inverters, its advantageous features are lower cost, lighter weight, smaller volume, higher efficiency, and less complexity. In this paper, a review of SPTG-CPV inverters has been carried out. The basic operational principles of all SPTG-CPV inverters are presented in details for positive, negative, and zero cycles. A comprehensive analysis of each topology has been deliberated. A comparative assessment is also performed based on weaknesses, strengths, component ratings, efficiency, total harmonic distortion (THD), semiconductor device losses, and leakage current of various SPTG-CPV inverters schemes. Typical PV inverter structures and control schemes for grid connected three-phase system and single-phase systems are also discussed, described, and reviewed. Comparison of various industrial grids-connected PV inverters is also performed. Loss analysis is also performed for various topologies at 1 kW. Selection of appropriate topologies for their particular application is thoroughly presented. Then, discussion and forthcoming progress are emphasized. Lastly, the conclusions are presented. More than 100 research publications on the topic of SPTG-CPV inverter topologies, configurations, and control schematics along with the recent developments are thoroughly reviewed and classified for quick reference.

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Siwakoti, Yam P., and Frede Blaabjerg. "Common-Ground-Type Transformerless Inverters for Single-Phase Solar Photovoltaic Systems." IEEE Transactions on Industrial Electronics 65, no. 3 (March 2018): 2100–2111. http://dx.doi.org/10.1109/tie.2017.2740821.

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Estévez-Bén, Adyr A., Alfredo Alvarez-Diazcomas, and Juvenal Rodríguez-Reséndiz. "Transformerless Multilevel Voltage-Source Inverter Topology Comparative Study for PV Systems." Energies 13, no. 12 (June 24, 2020): 3261. http://dx.doi.org/10.3390/en13123261.

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At present, renewable energies represent 25% of the global power generation capacity. The increase in clean energy facilities is mainly due to the high levels of pollution generated by the burning of fossil fuels to satisfy the growing electricity demand. The global capacity of generating electricity from solar energy has experienced a significant increase, reaching 505 GW in 2018. Today, multilevel inverters are used in PV systems to convert direct current into alternating current. However, the use of multilevel inverters in renewable energies applications presents different challenges; for example, grid-connected systems use a transformer to avoid the presence of leakage currents. The grid-connected systems must meet at least two international standards analyzed in this work: VDE 0126-1-1 and VDE-AR-N 4105, which establish a maximum leakage current of 300 mA and harmonic distortion maximum of 5%. Previously, DC/AC converters have been studied in different industrial applications. The state-of-the-art presented in the work is due to the growing need for a greater use of clean energy and the use of inverters as an interface between these technologies and the grid. Also, the paper presents a comparative analysis of the main multilevel inverter voltage-source topologies used in transformerless PV systems. In each scheme, the advantages and disadvantages are presented, as well as the main challenges. In addition, current trends in grid-connected systems using these schemes are discussed. Finally, a comparative table based on input voltage, switching frequency, output levels, control strategy used, efficiency, and leakage current is shown.

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Selmi, Tarek, and Maher Rezgui. "A Novel DC-AC Inverter Topology to Eliminate Leakage Current." International Journal of Power Electronics and Drive Systems (IJPEDS) 9, no. 4 (December 1, 2018): 1733. http://dx.doi.org/10.11591/ijpeds.v9.i4.pp1733-1744.

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Experiments confirmed that Transformerless Inverters (TIs) deliver more reliability and higher energy efficiency. Nonetheless, one of the shortcomings of TIs is the leakage current that occurs between the photovoltaic (PV) string terminals and the ground. Such a drawback is justified by the non-galvanic isolation caused by the transformer being omitted. As such, this study is intended to develop a novel TI inverter topology for solar PV systems. The latter is meant to remove the leakage current and enhance the operating system of the entire PV conversion as well. Added to its null zero-crossing distortion and capability regarding energy efficiency, the developed TI, being validated by simulation and experiment, eradicated the leakage current.

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R, Rajesh. "Design and Analysis of Grid Connected Transformerless Solar Inverter." IJIREEICE 5, no. 1 (January 15, 2017): 17–24. http://dx.doi.org/10.17148/ijireeice.2017.5105.

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Sourav, Soumya, Vikas Sharma, Vinayak Nadir, Siddharth Verma, and J. N. Rai. "Design & Simulation of Transformerless Power Convertors for Solar Application." INTERNATIONAL JOURNAL OF ADVANCED PRODUCTION AND INDUSTRIAL ENGINEERING 3, no. 1 (January 25, 2018): 27–32. http://dx.doi.org/10.35121/ijapie201801127.

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This paper presents simulation and design results for Transformerless Power Converters which are to be used in conjunction with a PV array for solar applications. The set of converters consists of a boost converter as well as a single-phase inverter for conversion of DC supply from the array to a usable AC voltage. The power extraction from the array is done by using the Maximum Power Point Tracking (MPPT) algorithm. Simulation is done on Proteus and PSIM.

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Grigoletto, Felipe Bovolini. "Five-Level Transformerless Inverter for Single-Phase Solar Photovoltaic Applications." IEEE Journal of Emerging and Selected Topics in Power Electronics 8, no. 4 (December 2020): 3411–22. http://dx.doi.org/10.1109/jestpe.2019.2891937.

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Baldwin Immanuel, T., P. Muthukumar, C. Gnanavel, M. Rajavelan, and M. Marimuthu. "Transformer less 1Φ Inverter for Grid-Connected PV Systems with an Optimized Control." International Journal of Engineering & Technology 7, no. 3.34 (September 1, 2018): 217. http://dx.doi.org/10.14419/ijet.v7i3.34.18968.

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This paper investigates the transformerless single-phase inverter incorporates with the photovoltaic system along with the support of grid voltage. Solar Energy is a Non-Conventional Energy source which is mandatory for power generation due to their immeasurable parade and green pleasant nature. One-cycle control (OCC), Ruggedness and consistency which makes the interfacing with the grid easily. For grid interfacing, the inverter circuit does not need phase locked loop facility and are gradually being working for such solicitations. The strategy of the OCC inverter of one stage for solar PV applications is supported by means of a Sinusoidal Pulse Width Modulation to enhance inverter enactment at both low and high insolation levels. These factors allows the plan of a MPPT along P&O controller that pointedly progresses inverter playacting. Though, the OCC-based structures testified previous sensing of the grid voltage which slightly equalizers the strength of its characteristics, In order to dazed the restriction of prior researches, an One Cycle Control based grid-connected one-stage PV system is suggested. The sustainability of the suggested scheme is inveterate by performance simulation justification.

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Ahmed, Waqar, Rizwan Ali, Ahmed Muddassir Khan, Shafquat Hussain, and Faisal Hussain. "Simulation Analysis of Single-Phase Transformerless H6 Inverter based Dual Input buck-boost Converter." Pakistan Journal of Engineering and Technology 4, no. 2 (June 5, 2021): 1–4. http://dx.doi.org/10.51846/vol4iss2pp1-4.

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To use the multiple renewable energy sources for single-phase AC applications with an H6 converter topology. Dual input DC-DC buck-boost converters that integrate the solar panel and a battery will regulate the required output DC voltage. Furthermore, for the AC applications of having small power and High power, the H6 topology of single-phase transformerless inverter is preferred because of less leakage current. To validate the proposed technique's feasibility, the MATLAB simulation is performed for the whole process that validates the converter's results and performance.

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, P Ankineedu Prasad, Kongathi Sivaram. "ANFIS based Transformerless UPFC for Effective Power Flow Control." International Journal for Modern Trends in Science and Technology 6, no. 7 (July 31, 2020): 148–52. http://dx.doi.org/10.46501/ijmtst060724.

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This paper focus on specially designed ANFIS based Power Quality Conditioner for Micro Grid applications. Three leg inverter coupled with solar PV with MPPT used as Compensator can be used for distinct DGs in the micro grid for power quality improvement of the entire system. Optimum control can be achieved to avoid detraction for voltage, current and Power flowing between Grid and DG. The Power Quality conditioner and DG inverter have dual use for this particular purpose. Primarily used as power converter for injecting power created from DG to Grid, secondly performed as parallel Active Power Filter for compensating harmonics, unbalanced voltage, current, active and reactive power demand for the balance and unbalance burden with in the Grid and neutral conductors. This paper is extended with ANFIS Controller for better improvement of Power Quality. The above mentioned task extensively simulated under MATLAB/Simulink platform revels that soon after compensation the THD.

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V L Vennela and Dr. S N V Ganesh. "ANN based Transformerless UPFC for Effective Power Flow Control." November 2020 6, no. 11 (November 23, 2020): 21–25. http://dx.doi.org/10.46501/ijmtst061105.

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This paper focus on specially designed ANFIS based Power Quality Conditioner for Micro Grid applications. Three leg inverter coupled with solar PV with MPPT used as Compensator can be used for distinct DGs in the micro grid for power quality improvement of the entire system. Optimum control can be achieved to avoid detraction for voltage, current and Power flowing between Grid and DG. The Power Quality conditioner and DG inverter have dual use for this particular purpose. Primarily used as power converter for injecting power created from DG to Grid, secondly performed as parallel Active Power Filter for compensating harmonics, unbalanced voltage, current, active and reactive power demand for the balance and unbalance burden with in the Grid and neutral conductors. This paper is extended with ANN Controller for better improvement of Power Quality. The above mentioned task extensively simulated under MATLAB/Simulink platform revels that soon after compensation the THD

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BRAJAMUSTHI, ANGGARA, SRI UTAMI, and DJAFAR SODIQ. "PLTS Transformerless Tegangan 20 kV menggunakan Cascaded H-Bridge Multilevel Inverter." ELKOMIKA: Jurnal Teknik Energi Elektrik, Teknik Telekomunikasi, & Teknik Elektronika 6, no. 1 (April 23, 2018): 16. http://dx.doi.org/10.26760/elkomika.v6i1.16.

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ABSTRAKAplikasi dari inverter multilevel pada sistem Pusat Listrik Tenaga Surya (PLTS) dapat menghilangkan kebutuhan terhadap transformator, sehingga dapat mengurangi biaya investasi, mengurangi kompleksitas instalasi dan menghilangkan rugi-rugi daya transformator. Pada penelitian ini, sebuah inverter dengan topologi Cascaded H-Bridge Multilevel Inverter dirancang agar mampu mengubah tegangan rendah DC dari beberapa Photovoltaic (PV) array menjadi tegangan fasa-fasa 20 kV AC. Perancangan menghasilkan sebuah inverter 3 fasa 27-level dimana setiap level masing-masing memiliki PV array, DC-DC boost converter, H-bridge inverter, dan keluaran 3 fasa terhubung dengan filter LCL. Setiap komponen dari inverter dan sistem tersebut kemudian dimodelkan pada MATLAB Simulink untuk mensimulasikan kinerja dari setiap komponen dan sistem pada Standard Test Condition (STC) dari modul PV. Pada keadaan STC, daya 3 fasa maksimum yang dapat dihasilkan adalah 1,716 MW atau 68,54% dari daya DC maksimum sebesar 2,5 MWp. Sistem dapat menghasilkan tegangan fasa-fasa keluaran sebesar 20 kV dengan Total Harmonic Distortion (THD) di bawah 5%.Kata kunci: Pusat Listrik Tenaga Surya (PLTS), photovoltaic, Cascaded H-Bridge Multilevel InverterABSTRACTThe application of Multilevel Inverter in a Photovoltaic Solar Power Plant system could eliminate the needs of step-up transformer, which will reduce the system investment cost, simplify the system installation and also eliminate power losses of the transformer. In this paper, an inverter design was proposed with Cascaded H-Bridge Multilevel Inverter topology that is capable of converting low voltage DC power from several PV arrays into 20 kV AC power. The design resulted a 3 phase 27-level inverter where each level in the inverter has its own photovoltaic array, DC-DC boost converter, H-bridge inverter, and the 3 phase output is connected to LCL filter. Each component of the Inverter and the system were then modelled in MATLAB Simulink to simulate the operation of the components and the system at PV Standard Test Condition (STC). At STC, the maximum 3 phase output power of the system is 1,716 MW or 68,54% of maximum DC power of 2,5 MWp. The system can reach 20 kV of output voltage with less than 5% THD. Keywords: Photovoltaic Power Plant System, PV, Cascaded H-Bridge Multilevel Inverter

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V, Kaviya, and Maruthupandi P. "PERFORMANCE ANALYSIS OF SOLAR PV-BATTERY GRID CONNECTED SINGLE PHASE TRANSFORMERLESS INVERTER." International Journal of Engineering Applied Sciences and Technology 5, no. 4 (August 1, 2020): 445–49. http://dx.doi.org/10.33564/ijeast.2020.v05i04.072.

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Raji, Atanda K., and Mohamed T. E. Kahn. "Investigation of common-mode voltage and ground leakage current of grid-connected transformerless PV inverter topology." Journal of Energy in Southern Africa 26, no. 1 (March 23, 2015): 20–24. http://dx.doi.org/10.17159/2413-3051/2015/v26i1a2217.

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The problems of increasing electricity demand by the unabated population and economy growth can be solved by employing sustainable distributed generation technologies. Convectional primary energy sources such as coal, liquid hydrocarbons’ and natural gasses create environmental degradation and energy security problems. Even though the cost of solar energy is zero, the same cannot be said of a solar energy system. The system cost especially the initial capital investment has been hindering the rapid deployment of solar energy systems. One way of reducing the system cost of a solar energy system is to look into the constituent components and see where cost can be reduced without compromising the system efficiency and human safety. Eliminating the isolation transformer reduces the cost and increases the system overall efficiency. However, the galvanic connection between the PV array and the utility grid creates a safety problem for people and system equipment. We present a simplified model for the investigation of the common mode voltage and ground leakage current that can lead to electromagnetic interference. The leakage current level is used for the determination of the suitability of the investigated PV inverter topology for grid connection without isolation transformer.

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Chamarthi, Phani Kumar, Ahmed Al-Durra, Tarek H. M. EL-Fouly, and Khaled Al Jaafari. "A Novel Three-Phase Transformerless Cascaded Multilevel Inverter Topology for Grid-Connected Solar PV Applications." IEEE Transactions on Industry Applications 57, no. 3 (May 2021): 2285–97. http://dx.doi.org/10.1109/tia.2021.3057312.

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Debnath, Dipankar, and Kishore Chatterjee. "Neutral point clamped transformerless grid connected inverter having voltage buck–boost capability for solar photovoltaic systems." IET Power Electronics 9, no. 2 (February 2016): 385–92. http://dx.doi.org/10.1049/iet-pel.2014.0873.

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Farzan Moghaddam, Ali, and Alex Van den Bossche. "Direct Usage of Photovoltaic Solar Panels to Supply a Freezer Motor with Variable DC Input Voltage." Electronics 9, no. 1 (January 16, 2020): 167. http://dx.doi.org/10.3390/electronics9010167.

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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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Dutta, Subhendu, Dipankar Debnath, and Kishore Chatterjee. "A Grid-Connected Single-Phase Transformerless Inverter Controlling Two Solar PV Arrays Operating Under Different Atmospheric Conditions." IEEE Transactions on Industrial Electronics 65, no. 1 (January 2018): 374–85. http://dx.doi.org/10.1109/tie.2017.2711577.

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Meraj, Mohammad, Syed Rahman, Atif Iqbal, and Lazhar Ben-Brahim. "Common Mode Voltage Reduction in a Single-Phase Quasi Z-Source Inverter for Transformerless Grid-Connected Solar PV Applications." IEEE Journal of Emerging and Selected Topics in Power Electronics 7, no. 2 (June 2019): 1352–63. http://dx.doi.org/10.1109/jestpe.2018.2867521.

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Zeb, Kamran, Saif Ul Islam, Waqar Ud Din, Imran Khan, Muhammad Ishfaq, Tiago Davi Curi Busarello, Iftikhar Ahmad, and Hee Je Kim. "Design of Fuzzy-PI and Fuzzy-Sliding Mode Controllers for Single-Phase Two-Stages Grid-Connected Transformerless Photovoltaic Inverter." Electronics 8, no. 5 (May 9, 2019): 520. http://dx.doi.org/10.3390/electronics8050520.

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Conventional Energy Resources (CER) are being rapidly replaced by Renewable Energy Resources (RER) due to their abundant, environmentally friendly, clean, and inexhaustible nature. In recent years, Solar Photovoltaic (SPV) energy installation is booming at a rapid rate among various RER. Grid-Connected PVS required advance DC-link controllers to overcome second harmonic ripple and current controllers to feed-in high-quality current to the grid. This paper successfully presents the design of a Fuzzy-Logic Based PI (F-PI) and Fuzzy-Logic based Sliding Mode Controller (F-SMC) for the DC-link voltage controller and Proportional Resonant (PR) with Resonant Harmonic Compensator (RHC) as a current controller for a Single-Phase Two-Stages Grid-connected Transformerless (STGT) Photovoltaic (PV) Inverter. The current controller is designed with and without a feedforward PV power loop to improve dynamics and control. A Second Order General Integral (SOGI)-based Phase Lock Loop (PLL) is also designed that has a fast-dynamic response, fast-tracking accuracy, and harmonic immunity. A 3 kW STGT-PV system is used for simulation in Matlab/Simulink. A comparative assessment of designed controllers is carried out with a conventionally well-tuned PI controller. The designed controllers improve the steady-state and dynamic performance of the grid-connected PV system. In addition, the results, performance measure analysis, and harmonics contents authenticate the robustness, fastness, and effectiveness of the designed controllers, related to former works.

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Zeb, Kamran, Muhammad Saqib Nazir, Iftikhar Ahmad, Waqar Uddin, and Hee-Je Kim. "Control of Transformerless Inverter-Based Two-Stage Grid-Connected Photovoltaic System Using Adaptive-PI and Adaptive Sliding Mode Controllers." Energies 14, no. 9 (April 29, 2021): 2546. http://dx.doi.org/10.3390/en14092546.

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To enhance the move towards a sustainable society, the solar Photovoltaic (PV) industry and its applications are progressing at a rapid rate. However, the associated issues need to be addressed when connecting PV to the grid. Advanced and efficient controllers are required for the DC link to control the second harmonic ripple and current controllers to inject quality active and reactive power to the grid in the grid-connected PV system. In this paper, DC-link voltage, active power, and reactive power are successfully controlled in stationary reference using Adaptive-PI (A-PI) and Adaptive-Sliding Mode Controller (A-SMC) for a 3 kW single-phase two-stage transformerless grid-connected inverter. A Resonant Harmonic Compensator (RHC)-based Proportional Resonant (PR) controller is employed in the current-controlled loop. The magnitude, phase, and frequency information of the grid voltage are provided by Second-Order General Integral (SOGI)-based PLL that has harmonic immunity, fast-tracking accuracy, and a rapid-dynamic response. MATLAB®/Simulink®/Simscape R2017b were used for the test bench implementation. Two scenarios were considered: in the first case, the input PV power feedforward loop was avoided, while in second case, it was included. The feedforward loop of input PV power improved the overall system dynamics. The results show that the designed controller improves both the steady-state and dynamic performance as compared with a proper-regulated PI-controller. The proposed controllers are insensitive to active and reactive power variations, and are robust, stable, faster, and fault tolerant, as compared to controllers from prior studies.

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Suryoatmojo, Heri. "Transformerless dc Converter for Distributed Solar Power Generation System." JAREE (Journal on Advanced Research in Electrical Engineering) 1, no. 1 (June 12, 2017). http://dx.doi.org/10.12962/j25796216.v1.i1.7.

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There are two types of distributed solar power generation system stand-alone system and grid-connected system. In grid-connected system usually are equiped with additional transformer to transfer the energy from solar power to the grid. However, it has resulted in considerable cost in providing these systems. Therefore in this reserach develops boost transformerless inverter system. The proposed system consists of a boost converter and transformerless inverter. Boost converter is used to increse the dc voltage yield by photovoltaic (PV) and delivered to the grid by mean of transformerless inverter.In order to maximize the power from PV, the proposed system is also designed with Maximum Power Point Tracking (MPPT) by changing the value of modulation index in the transformerless inverters. From the simulation results show that the system can work effectively in a variety conditions such as light intensity changed and fluctuating in the grid voltage side.

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Bharath, G. Veera, Arpan Hota, and Vivek Agarwal. "A New Family of 1- Five-Level Transformerless Inverters for Solar PV Applications." IEEE Transactions on Industry Applications, 2019, 1. http://dx.doi.org/10.1109/tia.2019.2943125.

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Gangavarapu, Sivanagaraju, Manisha Verma, and Akshay Kumar Rathore. "A Novel Transformerless Single-Stage Grid-Connected Solar Inverter." IEEE Journal of Emerging and Selected Topics in Power Electronics, 2020, 1. http://dx.doi.org/10.1109/jestpe.2020.3007556.

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Nunes, Hugo, Nelson Pimenta, Luís Fernandes, Paulo Chaves, and J. M. Dores Costa. "Modular buck-boost transformerless grid-tied inverter for low voltage solar panels." Renewable Energy and Power Quality Journal, April 2014, 109–14. http://dx.doi.org/10.24084/repqj12.250.

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Krishna, Bekkam, T. S. Bheemraj, and V. Karthikeyan. "Optimized Active Power Management in Solar PV-Fed Transformerless Grid-Connected System for Rural Electrified Microgrid." Journal of Circuits, Systems and Computers, August 19, 2020, 2150039. http://dx.doi.org/10.1142/s0218126621500390.

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Dynamic voltage instability is one of the major issues faced by grid-connected renewable energy systems due to fluctuations in the generation and sudden variation in the loads. The primary objective of this paper is to propose a method for constant power consumption from the grid to maintain a stable DC-link voltage during peak and nonpeak hours. It can be achieved by implementing an optimized active power management (OAPM) scheme between the photovoltaic (PV) and the grid by enabling a battery energy storage system (BESS). The intelligent constant power balance (ICPB) algorithm and detailed control strategies for dual active bridge (DAB) isolated DC–DC converter and grid-connected voltage source inverter (VSI) are discussed in this paper. Moreover, the high-gain step-up DC–DC converter (HSDC) is utilized to perform maximum power point tracking (MPPT) operation and to meet the required DC-link voltage. The accuracy of power transmission of DAB gets improved by imposing a curve-fitting interpolation (CFI) approach, thereby maintaining a constant DC-link voltage. Furthermore, an instantaneous sinusoidal current control (ISCC) scheme assures the feeding of active power with better power quality. The measured results are obtained and verified under different dynamic conditions of load and generation. Based on the validation, we conclude that the proposed OAPM scheme is most suitable for grid-connected renewable energy systems in the rural electrified microgrid.

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Journal articles on the topic 'Transformerless solar inverters'

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