A Novel Three-Phase Transformerless H-8 Topology With Reduced Leakage Current for Grid-Tied Solar PV Applications

Gupta, Amit Kumar; Agrawal, Himanshu; Agarwal, Vivek

doi:10.1109/tia.2018.2883372

Cited by 51 publications

(48 citation statements)

References 27 publications

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“…This variation of the ESI topology in [22] and the ZVR topology in [25] is also zero. Meanwhile, it varies within 33% of DC-link voltage with voltage-clamping topology in [21], H8 topology in [23], and modified H8 topology in [24]. The variation in CMV of SCVD topology in [28] is also 33% of DC-link voltage with DPWM and 16% of DC-link voltage with NSPWM.…”

Section: Comparison With Other Three-phase Inverter Topologiesmentioning

confidence: 99%

“…Compared to the ESI topology in [22], the CCMVI topology uses two less switches and four more diodes as highlighted in Table 3. Compared to H8 topology in [23] and modified H8 topology in [24], the proposed inverter uses three more capacitors, two more switches and four more diodes as shown in Table 3. Compared to the ZVR topology, the proposed inverter uses eight less diodes, one more capacitor and one more switch as highlighted in Table 3.…”

Section: Pwm Control Technique For Proposed Ccmvimentioning

confidence: 99%

“…As highlighted in Table 3, we can see that the CCMVI topology operates with the full range of modulation index while the conventional VSI using NSPWM in [8] and RSPWM in [10] have limitations on the modulation index. H8 topology in [23], modified H8 topology in [24], and the ZVR topology in [25], also operates with the full range of modulation index as emphasized in Table 3.…”

Section: Pwm Control Technique For Proposed Ccmvimentioning

confidence: 99%

“…By controlling two extra switches to disconnect the input DC source from the inverter during zero states, the variation of CMV is restricted within one-third of DC-link voltage. In the improved H8 topology [24], CMV during zero states is clamped to two-fifths of DC-link voltage by controlling two extra switches. As a result, the variation of CMV is also restricted within one-third of DC-link voltage.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

A Three-Phase Constant Common-Mode Voltage Inverter With Triple Voltage Boost for Transformerless Photovoltaic System

et al. 2020

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This paper introduces a new three-phase two-level inverter based on the switched-capacitor voltage multiplier. By adding a voltage multiplier network at the DC side of the traditional three-phase inverter topology, the DC-link voltage of the introduced inverter is stepped up to triple of the input voltage. Compared to the existing solutions, the common-mode voltage of the introduced topology is kept constant. Moreover, the voltage stress across additional semiconductor components is the same as one-third of DC-link voltage. Operating principles, mathematical analysis, circuit analysis, and pulse-width modulation (PWM) method based on the Boolean logic function for introduced inverter are presented. A comparison of the introduced inverter with other inverter topologies is also reported. The simulation results are shown to verify the introduced three-phase triple voltage boost inverter. Besides that, a laboratory-built prototype is developed based on a DSP F280049C microcontroller and the corresponding experimental tests are provided to prove the introduced inverter. INDEX TERMS Three-phase inverter, transformerless PV system, common-mode voltage, leakage current, switched-capacitor network.

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Section: Comparison With Other Three-phase Inverter Topologiesmentioning

confidence: 99%

Section: Pwm Control Technique For Proposed Ccmvimentioning

confidence: 99%

Section: Pwm Control Technique For Proposed Ccmvimentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A Three-Phase Constant Common-Mode Voltage Inverter With Triple Voltage Boost for Transformerless Photovoltaic System

et al. 2020

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“…To increase the stability and reliability of the network, the frequency control of the network and the control of the active and reactive generation capacities have been published and addressed in this standard. So the main problems and concerns in a transformer-less PV inverter can be summarized in the efficiency, [23][24][25][26] cost, [27][28][29][30] and reliability [31][32][33][34] dimensions.…”

Section: Introductionmentioning

confidence: 99%

An FPGA‐based switching photovoltaic‐connected inverter topology for leakage current suppression in grid‐connected utilizations

Ghaderi

2020

Circuit Theory & Apps

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This study presents a symmetrical photovoltaic (PV)-connected inverter topology for eliminating the common-state leakage current in grid-connected inverters. A new inverter topology is introduced that minimizes the leakage current, increases efficiency, and is economically viable because it consists of six power switches and two power diodes that, compared with similar ones, consist of the same element numbers. In this inverter, power losses are lower than popular topologies such as H5, H6, and HERIC, and the voltage stresses of the switches are reduced. These features are due to the unique composition of the inverter branches and the location of the switches and diodes and the formation of a suitable freewheeling path for the current. The freewheeling path separates the alternating current (AC) side from the direct current side in the converter and cuts off the PV array leakage current to the AC grid. This will improve network reliability indices and maintain conservation standards. Finally, the content of this method is validated by comparing the proposed inverter with the existing conventional topologies. A prototype has been implemented for the performance analysis of the proposed inverter and results presented.

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Modified neural network algorithm‐based control scheme of grid connected solar photovoltaic systems

Kaushik¹,

Kalla

Singh

2020

Int Trans Electr Energ Syst

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This article presents the real time implementation of modified neural network algorithm-based control scheme for three-phase grid connected solar photovoltaic (PV) systems. The modified neural network-based controller estimates the reference current, which is further required to produce pulses for the switching of Insulated Gate Bipolar Transistor (IGBTs) of Voltage Source Converter (VSC). The adaptive conjunction constant of the implemented control scheme is dimension less that makes the conversion step size of the implemented control, a data depended and time varying with a very high dynamic response.The purposed control is highly suitable for feeding intermittent duty loads. This is achieved with the help of very fast reactive power compensation capability of the implemented control during sudden and frequent variations in load current. The impacts of sudden and frequent changes in load current on the system due to intermittent duty loads are mitigated at adaption stage of the control. The VSC is supplying reactive power and harmonic currents required to the nonlinear loads. It also converts DC power of solar PV into AC power of desired voltage and frequency in synchronization with the grid. It supplies power demanded by the load and surplus power is pumped into the grid.artificial neural network, grid connected, neural-network, power generation, power quality, solar energy, solar power, VSC * , Reference grid currents; i vsca , i vscb , i vscc , Three-phase VSC currents; L 1 , Interfacing inductor; P PV , Solar PV power; S 1 ,S 2 , S 3 ,S 4 ,S 5 ,S 6 , Gating signal; V dc , Sensed DC link voltage; V dc * , Reference DC link voltage; V PV , Solar PV voltage; v sa , v sb , v sc , Sensed voltages at PCC.

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A Novel Three-Phase Transformerless H-8 Topology With Reduced Leakage Current for Grid-Tied Solar PV Applications

Cited by 51 publications

References 27 publications

A Three-Phase Constant Common-Mode Voltage Inverter With Triple Voltage Boost for Transformerless Photovoltaic System

A Three-Phase Constant Common-Mode Voltage Inverter With Triple Voltage Boost for Transformerless Photovoltaic System

An FPGA‐based switching photovoltaic‐connected inverter topology for leakage current suppression in grid‐connected utilizations

Modified neural network algorithm‐based control scheme of grid connected solar photovoltaic systems

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