A Common-Ground Quazi-Z-Source Single-Phase Inverter Suitable for Photovoltaic Applications

Sarikhani, Ali; Ghaderi, Mohammad Ali; Hamzeh, Mohsen

doi:10.1109/tec.2020.3013115

Cited by 9 publications

(9 citation statements)

References 24 publications

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“…Topologies of the doubly grounded transformer-less singlephase inverters can be deduced from the combination of the traditional converters, called hybrid topologies. One method is that conventional bridge-type inverters can be combined with other converters to construct common-ground inverters [7][8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23][24]. Since output voltage of the inverter is sinusoidal waveform, there are two polarities of the output voltage, that is, positive and negative.…”

Section: Topologies and Their Derivationsmentioning

confidence: 99%

Topology review of doubly grounded transformer‐less single‐phase inverters

Yao

2022

IET Power Electronics

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Photovoltaic (PV) transformer-less single-phase inverters are widely used in the solar generation systems because of low cost, high power density, and high efficiency. However, there is a common mode leakage current in the transformer-less inverters, which may endanger personal safety. In order to reduce the common mode leakage current, extra semiconductors should be added into the PV inverters to decouple the dc side from the ac side. However, the common mode leakage current is affected by the environmental condition and parameters of power devices. Since grounds of the PV array and the output terminal of the inverter are shorted, the common mode leakage current in the doubly grounded inverters can be eliminated thoroughly. Topologies of the doubly grounded inverters are reviewed in this paper, which can be divided into two categories, that is, hybrid topologies and topologies using energy storage elements. Derivation of the reviewed topologies is given. Different topologies of doubly grounded transformer-less single-phase inverters are compared.

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Section: Topologies and Their Derivationsmentioning

confidence: 99%

Topology review of doubly grounded transformer‐less single‐phase inverters

Yao

2022

IET Power Electronics

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“…The converters introduced in [56,60,61] uses coupled inductors to acquire high boosting capability. However, this results in increased cost and size also.…”

Section: Boosting Vscgmentioning

confidence: 99%

“…However, high electrolytic capacitors may be needed for voltage balancing over these capacitors. On the other hand, the converters introduced in [60,61] can offer only two voltage levels. Thus, a large filter size is needed.…”

Section: Boosting Vscgmentioning

confidence: 99%

“…This can significantly increase the cost and reduce efficiency. [57], (e) converter presented in the work of [58], the work of [59], (f) converter presented in the work of [60], (g) converter presented in the work of [61], (h) converter presented in the work of [62], (i) converter presented in the work of [63].…”

Section: Boosting Vscgmentioning

confidence: 99%

“…Voltage-source common-grounded (CSCG) converters (boosting type). (a) Converter presented in the work of [54], (b) converter presented in the work of[55], (c) converter presented in the work of[56], (d) converter presented in the work of[57], (e) converter presented in the work of[58], the work of[59], (f) converter presented in the work of[60], (g) converter presented in the work of[61], (h) converter presented in the work of[62], (i) converter presented in the work of[63].…”

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confidence: 99%

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Common-Ground Photovoltaic Inverters for Leakage Current Mitigation: Comparative Review

et al. 2021

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In photovoltaic systems, parasitic capacitance is often formed between PV panels and the ground. Because of the switching nature of PV converters, a high-frequency voltage is usually generated over these parasitic capacitances; this, in turn, can result in a common-mode current known as leakage current. This current can badly reach a high value if a resonance circuit is excited through the PV’s parasitic capacitance and the converter’s inductive components. Transformers are usually used for leakage current mitigation. However, this decreases the efficiency and increases the cost, size, and weight of the PV systems. Number of strategies have been introduced to mitigate the leakage current in transformer-less converters. Among these strategies, using common-ground converters is considered the most effective solution as it offers a solid connection between the negative terminal of PV modules and the neutral of the grid side; thus, complete mitigation of the leakage current is achieved. Number of common-ground inverters have been recently presented. These inverters are different in their size, cost, boosting capability, the possibility of producing DC currents, and their capability to offer multilevel shaping of output voltage. This work introduces a comprehensive review and classification for various common-ground PV inverters. Therefore, a clear picture of the advantages and disadvantages of these inverters is clarified. This provides a useful indication for a trade-off between gaining some of the advantages and losing others in PV systems. In addition, the potentials for optimization based on different performance indicators are identified.

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A five‐level common‐ground inverter with step‐up/step‐down dual‐mode operation for transformerless grid‐connected PV application

Grigoletto,

Cedieu,

Chaves

et al. 2023

Circuit Theory & Apps

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Step‐up multilevel inverters with common‐ground feature are attractive for transformerless photovoltaic systems. However, their performance deteriorates at step‐down voltage range. Considering a five‐level inverter with double voltage gain, the number of output voltage levels decreases from 5 to 3 for a modulation index smaller than 0.5, declining the quality of the output currents. This paper proposes a new dual‐mode five‐level common‐grounded inverter with a reduced number of switches. The proposed topology has the ability to operate as step‐up or step‐down making it well suited for application with wide input voltage range. The proposed inverter consists of five unidirectional switches, one bidirectional switch, two diodes, and two capacitors. In addition, the description of the topology, the design guidelines, and a comparison among the main topologies are given in detail. Experimental results are obtained to attest the practicability of the proposed solution.

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A Common-Ground Quazi-Z-Source Single-Phase Inverter Suitable for Photovoltaic Applications

Cited by 9 publications

References 24 publications

Topology review of doubly grounded transformer‐less single‐phase inverters

Topology review of doubly grounded transformer‐less single‐phase inverters

Common-Ground Photovoltaic Inverters for Leakage Current Mitigation: Comparative Review

A five‐level common‐ground inverter with step‐up/step‐down dual‐mode operation for transformerless grid‐connected PV application

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