Three-Phase Filter-Clamped Transformerless Inverter for Grid-Connected Photovoltaic Systems with Low Leakage Current

Rahimi, Ramin; Farhadi, Masoud; Moradi, Gholam Reza; Farhangi, Babak; Farhangi, Shahrokh

doi:10.1109/tia.2020.3008134

Cited by 20 publications

(7 citation statements)

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“…6. Consistent with exisiting literature, the value of C P V is taken as 400 nF and value of R G is taken as 10 Ω [36]- [39] for grid-connected PV converter. For motor drive application, the values of distributed parasitic capacitances and motor frame resistances are taken from [42] i.e., C g1 = 0.33 nF, R g1 = 100 Ω, C g2 = 1.65 nF, R g2 = 220 Ω.…”

Section: Analysis On CMV and Leakage Current With 240cpwmmentioning

confidence: 99%

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240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

Qamar

Korada

2022

IEEE Open J. Power Electron.

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Transformerless voltage source inverters (VSIs) are one of the popular topologies for photovoltaic (PV) gridconnected applications due to the lowest component count and simple design. Because of the absence of galvanic isolation in such systems, problem of electromagnetic interference (EMI) due to high leakage current is highly pronounced. Recently various reduced common mode voltage (CMV) PWM (RCMV-PWM) methods which address these issues of CMV, and leakage current have been proposed. These schemes typically function at the expense of increased total harmonic distortion (THD), higher switching loss, high DC link current stress along with limited modulation index range. In this work, 240 • clamped PWM (240CPWM) is selected as an ideal candidate for grid connected VSIs in terms of all round performance of switching loss, THD, DC link current stress, CMV and leakage current. 240CPWM is a relatively new space vector based PWM method which can attain much superior performance by avoiding the zero states. After a brief overview of the 240CPWM concept, the paper provides a detailed comparison of 240CPWM with conventional space vector PWM (CSVPWM) and discontinuous PWM (DPWM1) methods in terms of each of the above metrics. A 3-phase 208 V 3 kW silicon IGBT based hardware prototype is built to validate the performance of 240CPWM and compared with other popular schemes under grid-connected mode. Experimental results show a 66.7% reduction in the peak CMV and 50% reduction in leakage current with the proposed scheme as compared to CSVPWM. Also, THD, DC link current stress and inverter switching loss are greatly reduced as an added advantage using the proposed method. A new, combined performance index is proposed to compare the performance of different PWM schemes, and it is shown that the 240CPWM achieves the best value for this index among the PWM methods studied.

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Section: Analysis On CMV and Leakage Current With 240cpwmmentioning

confidence: 99%

“…Value of R G is uncertain, usually around few ohms. Based on thorough literature survey of transformerless grid connected PV inverters, R G is taken as 10 Ω in this study [36]- [39].…”

Section: Introductionmentioning

confidence: 99%

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

Qamar

Korada

2022

IEEE Open J. Power Electron.

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“…For completing the removed leakage current, the CMV should remain constant throughout the inverter operation. Rahimi et al 14 have presented a filter-clamped inverter that was used in TLPV connected to a three-phase. The TLPV inverters were highly well-organized and cost effectual compared with alternatives that rely on HF and LF isolation transformers.…”

Section: Recent Research Work: a Brief Reviewmentioning

confidence: 99%

CNN ‐based deep learning technique for improved H7 TLI with grid‐connected photovoltaic systems

Ramasamy¹,

Perumal²

2021

Int J Energy Res

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In this article, a three-phase transformerless inverter (TLI) for a solar photovoltaic (PV) system connected to a high-power grid are proposed, which has advantages of better performance and lower cost. The primary concern about the TLI is fluctuations in the common-mode voltage, which impacts switching frequency leakage current and grid interface system. An improved H7 common-mode voltage (CMV) clamped TLI with discontinuous pulse width modulation (DPWM) is designed using a conventional neural network (CNN)based deep learning approach. In this, a completely minimized leakage current is obtained to avoid CMV transients. The proposed PV-connected improved H7-TLI provides low-loss DC-side decoupling, which further reduces leakage current and isolation of the PV system during off-grid. In addition, the effects of several factors on CNN deep learning performance are explored, including training data size, image resolution, and network configuration. The proposed technique has the potential to be used in a test instrument for intelligent signal analysis or used in an artificial intelligence system. Switching loss is analyzed using proposed and existing H7 inverters under different load conditions. To verify the theoretical explanation, existing H7 inverters is analyzed by MATLAB/Simulink, and the outcomes are tested experimentally. The total harmonic distortion (THD) analysis of proposed and existing topology is analyzed and compared. The THD values of the existing and proposed topology are 3.74% and 3.23%, respectively.

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“…From costs perspective, a structure with less number of elements is usually economical. Recently, different types of FCLs are presented with different features [9]- [11], [27]. Whereas the need for a structure that can limit the fault currents is investigated in literature, a simultaneous voltage sag compensation or harmonics compensation is studied just in few literatures such as [9]- [12].…”

mentioning

confidence: 99%

“…In [8], the voltage sag in the presence of superconducting FCL (SFCL) is investigated. The superconductor based FCLs have a low or no power loss during normal and fault conditions, so they are attractive in industry [26]- [27]. However, in recent years due to the high technology demands and higher costs of the superconductive materials, application of non-superconductor FCLs is recommended [1], [9].…”

mentioning

confidence: 99%

Fault Current Limiter Dynamic Voltage Restorer (FCL-DVR) With Reduced Number of Components

Ghavidel

Farhadi

Dabbaghjamanesh

et al. 2021

IEEE J. Emerg. Sel. Top. Ind. Electron.

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In this paper, a new dual function fault current limiter-dynamic voltage restorer (FCL-DVR) topology is proposed. The proposed structure, in addition to performing routine FCL tasks, can be used to improve the voltage quality of point of common coupling (PCC). A salient feature of this FCL-DVR is its reduced number of semiconductor switches and gate drive and control circuit components. Perhaps, variety structures of FCL-DVR have been proposed but most distinctive feature of proposed structure is lower power loss. The operation modes and the control strategy of the FCL have been presented and studied.

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Three-Phase Filter-Clamped Transformerless Inverter for Grid-Connected Photovoltaic Systems with Low Leakage Current

Cited by 20 publications

References 0 publications

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

240$^\circ$-Clamped PWM Applied to Transformerless Grid Connected PV Converters With Reduced Common Mode Voltage and Superior Performance Metrics

CNN ‐based deep learning technique for improved H7 TLI with grid‐connected photovoltaic systems

Fault Current Limiter Dynamic Voltage Restorer (FCL-DVR) With Reduced Number of Components

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