Leakage Current Mitigation in Transformerless Z-Source/Quasi-Z-Source PV Inverters: An Overview

Yuan, Jing; Yang, Yongheng; Blaabjerg, Frede

doi:10.1109/ecce.2019.8911827

Cited by 6 publications

(5 citation statements)

References 38 publications

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“…However, this solution limits modulation index range and output voltage quality, which reduces the output quality of the inverter. The overview of these control methods is also discussed in [37][38][39][40][41].…”

Section: Buck-type Topologiesmentioning

confidence: 99%

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Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

et al. 2022

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In grid-connected photovoltaic (PV) systems, a transformer is needed to achieve the galvanic isolation and voltage ratio transformations. Nevertheless, these traditional configurations of transformers increase the weight, size, and cost of the inverter while decreasing the efficiency and power density. The transformerless topologies have become a good solution. However, the problem is that commode-mode voltage and leakage current can occur via the stray capacitors between the PV array and the ground of the inverter. Various transformerless inverters have been introduced with different techniques, such as reducing the common-mode voltage or eliminating the leakage current. Furthermore, to introduce the development of transformerless PV inverters, especially in three-phase two-level inverter systems, this paper provides a comprehensive review of various common-mode voltage reduction three-phase two-level inverters.

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Section: Buck-type Topologiesmentioning

confidence: 99%

“…Moreover, the prior-art solutions for traditional VSIs are not suitable for the impedance-source-based inverters system. Hence, the review solutions for CMV reduction in the impedance-source-based in VSIs are presented in [41]. However, not many different comparisons have been conducted in this review paper.…”

Section: Introductionmentioning

confidence: 99%

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

et al. 2022

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“…However, they have the drawbacks of high output voltage THD value and software complications. Some of the popular modulation-based CMV reduction techniques are remote state space vector PWM (RS-SVPWM), active zero state space vector PWM (AZS-SVPEM), and near state space vector PWM (NS-SVPWM) method [54][55][56][57]. The qSBI topology has the drawback of high amplitude common-mode voltage due to ST state insertion.…”

Section: Qsb Derived Topologiesmentioning

confidence: 99%

Topological Review of Quasi-Switched Boost Inverters

et al. 2021

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This paper presents a comprehensive review based on the features and drawbacks of the quasi-switched boost inverter (qSBI) topologies. The qSBI derived configurations are well suitable for low power applications due to their reduced number of components. This work focuses on the topological review of qSBI derived topologies and serves as a reference for further derivation and research on the selection of suitable topology for the specific renewable energy applications, particularly based on the photovoltaic (PV) converters.

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“…The modulation index of this method can reach 1. In [34], summarizes the existing methods for reducing common mode voltage and leakage current in twolevel three-phase Z-source inverters.…”

Section: Introductionmentioning

confidence: 99%

A Common-Mode Voltage Reduction PWM Strategy for Three-Phase Quasi-Z-Source Inverter With Optimized Switching Losses

Jiang,

Zhang,

Wang

et al. 2023

IEEE Access

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The application of the Z-source/quasi-Z-source inverter exacerbates the hazard of common mode voltage in motor drives or photovoltaic systems. The existing reduced common-mode voltage pulse width modulation (RCMV-PWM) technique applied to the Z-source/quasi-Z-source inverter has solved the problem of common mode voltage suppression to a certain extent, but its switching losses have not been optimized. In this paper, the existing Active zero-state PWM (AZSPWM) and remote state PWM (RSPWM) strategies in quasi-Z-source inverters are analyzed, and a new switching loss optimized common mode reduction modulation strategy is proposed. This algorithm does not change the original common-mode voltage suppression effect, while reducing the number of switching times in a switching period, thereby reducing the switching losses. By optimizing the shoot-through vector insertion method, the current stress of the switching device is reduced. The proposed modulation strategy does not affect the operating range and boost factor of the quasi-Z-source inverter OPWM strategy. The simulation results show that when the output power is 1kw, the proposed strategy can improve efficiency by at least 1% compared to the odd PWM(OPWM) strategy. Finally, A low-power test platform is built to verify the loss optimization effect.INDEX TERMS Common-mode voltage, Space vector, Switching loss optimization, Z-source inverter, odd PWM(OPWM).

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Leakage Current Mitigation in Transformerless Z-Source/Quasi-Z-Source PV Inverters: An Overview

Cited by 6 publications

References 38 publications

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

Topology Review of Three-Phase Two-Level Transformerless Photovoltaic Inverters for Common-Mode Voltage Reduction

Topological Review of Quasi-Switched Boost Inverters

A Common-Mode Voltage Reduction PWM Strategy for Three-Phase Quasi-Z-Source Inverter With Optimized Switching Losses

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