Single-phase single-stage dual-buck photovoltaic inverter with active power decoupling strategy

Hwang, Duck-Hwan; Lee, Jung‐Yong; Cho, Younghoon

doi:10.1016/j.renene.2018.03.069

Cited by 16 publications

(16 citation statements)

References 18 publications

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“…3 c , the positive half‐cycle equivalent circuit of TDFGI‐H5 is a symmetric inductance GCI. To eliminate the differential‐mode voltage of TDFGI‐H5, it is stipulated that L 2 = L g = L [6, 9]. Based on [9], the effective common‐mode voltage u ecm of Fig.…”

Section: Topology and Common‐mode Leakage Current Analysis Of The Pmentioning

confidence: 99%

“…H‐bridge GCIs are applied widely for its simple structure and low cost in [6, 7]. However, these H‐bridge GCIs need to set dead time to avoid the shoot‐through problem, and the dead‐time effect will cause the distortion of grid‐connected current, which would decrease the power quality of PV system in [8, 9]. In addition, during the dead time, the inductor current flows through the body diodes, which have long reverse recovery time and large reverse recovery loss [10, 11].…”

Section: Introductionmentioning

confidence: 99%

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Research on transformerless dual‐buck full‐bridge grid‐connected inverter with H5‐type for PV systems

Dai

Li²,

Zhou

et al. 2019

IET Power Electronics

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To eliminate the common-mode leakage current in the transformerless grid-connected photovoltaic (PV) system, inspired by the newly-developed embedded-switch H5 topology and dual-buck full-bridge grid-connected inverter (GCI), a novel transformerless dual-buck full-bridge GCI with H5-type (TDFGI-H5) topology for PV systems is firstly presented. Then, the operating modes and common-mode leakage current of TDFGI-H5 modulated by unipolar sinusoidal pulse-width modulation are analysed. The analysis result shows that TDFGI-H5 has the advantages of the three-level output, no shoot-through problem, high reliability, and can completely meet the condition of eliminating common-mode leakage current. Aim at the problem of the common-mode leakage affected by the switches' junction capacitances, the effect of switch's junction capacitance is explored in detail when TDFGI-H5 is in the transient process that converts from non-decoupling states to decoupling states. Finally, the results of experiment verify the correctness of the theoretical analysis.

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Section: Topology and Common‐mode Leakage Current Analysis Of The Pmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Research on transformerless dual‐buck full‐bridge grid‐connected inverter with H5‐type for PV systems

Dai

Li²,

Zhou

et al. 2019

IET Power Electronics

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show abstract

“…The increasing development and studies on DC-DC converters lead the researchers to modify and operate these converters in inverter mode for a long time. There are many successful studies on such as buck [8][9][10], boost [11][12][13] and Ćuk [14][15][16] converters based inverters in the literature. The switch-mode characteristics with high frequency through the main inductor-capacitor low-pass filter structure of these inverters provide producing very close to sine form with very low THD values without need of coupling transformer or any addition passive filter at the output of these inverters according to the PWM-type and PAM-type inverters.…”

Section: Introductionmentioning

confidence: 99%

Robust single‐phase inverter based on the buck–boost converter through an efficient hybrid control

Yalçın

Arifoğlu²,

Yazıcı³

et al. 2020

IET Power Electronics

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This study presents a new and robust single-phase inverter based on the buck-boost converter. The proposed inverter topology has minimised numbers of active and passive elements that provide less complexity and cost. Unlike similar studies in the literature, an efficient hybrid control technique is used for the control of the inverter operation. The hybrid control technique is comprised of the traditional feedback proportional-integral-derivative (PID) controller and the new proposed openloop control technique called 'control law'. This hybrid control technique provides stable and high response performance operation for the proposed inverter while the system parameters change. The proposed inverter can operate with a wide range of output frequency and output voltage value on different load conditions while satisfying <5% voltage total harmonic distortion (THD) value of the output voltage. An experimental laboratory setup with the values of 0.5 kW, 0-100 V p and 0-50 Hz is built for the proposed inverter. The experimental results demonstrate that the proposed inverter can produce high-quality output voltage with <5% THD on different input and output system parameters.

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“…Among various topology solutions, dual-buck inverters (DBI) have been considered as a promising circuit structure to achieve a high efficiency and low leakage current without significant engineering efforts [6,16,17]. The switching modulation method of the DBI is characterized by S p and S 1 in positive and S n and S 2 in negative depending on the polarity of the grid voltage.…”

Section: Introductionmentioning

confidence: 99%

“…In addition, it is also attractive that the ground leakage current can be significantly reduced. Further analysis about the DBI can be found in the literature [16,17].…”

Section: Introductionmentioning

confidence: 99%

Synchronous Reference Frame Repetitive Control of a Single-Phase Three-Level Dual-Buck Photovoltaic Inverter

Lee¹,

Cho²

2018

Electronics

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This paper proposes a synchronous reference frame (SRF) control strategy for a single-phase, three-level, dual-buck photovoltaic (PV) inverter. The concept of virtual d-q transformation is adapted to the current control of the inverter, and the repetitive controller is implemented in the SRF. With the proposed control strategy, the memory allocation quantity for the repetitive controller is decreased and the capability of the current reference tracking is maximized. Thus, the proposed method significantly reduces the total harmonic distortion (THD) of the output current in both the continuous conduction mode (CCM) and the discontinuous conduction mode (DCM). In addition, the distortion of the output current is mostly composed of odd harmonics. Odd harmonic expressed to the even harmonic in SRF can be calculated using Park’s transformation. Therefore, a repetitive controller can improve dynamics by considering only even harmonic components in SRF rather than including all harmonics. The simulation and the experimental results verify the effectiveness of the proposed control strategy. The proposed method not only reduces the THD of the output current in both the CCM operation and the DCM operation, but also improves the dynamics of the current controller.

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Single-phase single-stage dual-buck photovoltaic inverter with active power decoupling strategy

Cited by 16 publications

References 18 publications

Research on transformerless dual‐buck full‐bridge grid‐connected inverter with H5‐type for PV systems

Research on transformerless dual‐buck full‐bridge grid‐connected inverter with H5‐type for PV systems

Robust single‐phase inverter based on the buck–boost converter through an efficient hybrid control

Synchronous Reference Frame Repetitive Control of a Single-Phase Three-Level Dual-Buck Photovoltaic Inverter

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