Leakage Current Elimination of Four-Leg Inverter for Transformerless Three-Phase PV Systems

Guo, Xiaoqiang; He, Rujie; Jian, Jiamin; Lu, Zhengding; Sun, Xiaofeng; Guerrero, Josep M.

doi:10.1109/tpel.2015.2477539

Cited by 134 publications

(49 citation statements)

References 20 publications

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“…There are many kinds of topologies to meet the above requirements, such as the split capacitor inverter (SCI) [1,2], four-leg inverter [3][4][5][6][7][8][9], and neutral point forming transformer (NFT) inverter [10,11]. The split capacitors of SCI not only act as support capacitors, but also provide the route of the unbalanced current and ripple current, which means that split capacitors have a larger volume and weight, and the ripple current in support capacitors and filter capacitors is larger than in other structures, which makes the capacitors be vulnerable to the ripple current.…”

Section: Introductionmentioning

confidence: 99%

Control Strategy of Three-Phase Inverter with Isolation Transformer

Chen

Qiu

et al. 2019

Energies

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In order to improve the control performance of a train auxiliary inverter and satisfy the requirements of power quality, harmonics, and unbalanced factor, this paper proposed a design method of a double closed-loop control system based on a complex state variable structure. The method simplifies the design process and takes full account of the effects of coupling and discretization. In the current closed-loop process, this paper analyzed the limitations of the proportional integral (PI) controller and simplified to P controller. In the voltage closed-loop, the paper employed the PI controller plus the resonant controller, designed the parameters of the PI controller. and analyzed the optimal discretization method of the resonant controller under dq axis coupling. Finally, experiments and simulations were conducted to show that the proposed method can achieve the above improvements.

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Section: Introductionmentioning

confidence: 99%

Control Strategy of Three-Phase Inverter with Isolation Transformer

Chen

Qiu

et al. 2019

Energies

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“…Over the last two decades, the photovoltaic (PV) power systems have become very popular among the renewable energy sources, because they generate electricity with no moving parts, operate quietly with no emissions, and require little maintenance. [1], [2]. Distributed grid-connected PVs are playing an increasingly role as an integral part of the electrical grid.…”

Section: Introductionmentioning

confidence: 99%

Single Phase Transformer Less Inverter Using Fuzzy control with Charge Pump Circuit Concept for Grid-Tied PV Applications

Tekale¹

2019

IJRASET

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This paper proposes a implementation of a single phase transformer less photovoltaic inverter for grid connect PV system. We are developing new topology to eliminate the leakage current in which concept of charge pump circuit is introduced. In this paper, for controlling purpose we are utilizing Fuzzy Logic Controller. The neutral of the grid is directly connected to the negative polarity of the PV panel that creates a constant common mode voltage and zero leakage current. During the negative cycle, the charge pump circuit generates the negative output voltage of the proposed inverter. Therefore, according to the proportional resonant control strategy is used to control the injected current. There are various advantages of the proposed inverter they are the neutral of the grid is directly connected to the negative terminal of the PV panel, so the leakage current is eliminated, its compact size; low cost; the used dc voltage of the proposed inverter is the same as the full-bridge inverter (unlike neutral point clamped (NPC), active NPC, and half-bridge inverters); flexible grounding configuration; capability of reactive power flow; and high efficiency. By using simulation result we can verify the concept of the proposed inverter and its practical application in grid-tied PV systems.

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“…The authors of [6] propose a PWM technique for a TL PV cascaded multi-level inverter, by which a minimization of leakage current is achieved compared to the conventional SPWM method with less number of carrier waves and without the need for additional switches. Regarding the leakage current in 3φ TL PV systems, in [7] a modulation strategy for eliminating the leakage current of a four-leg inverter by keeping the common-mode voltage constant is presented. The reduction of the leakage current in a H7 3φ inverter is also the target in [8].…”

Section: Introductionmentioning

confidence: 99%