High‐efficiency PV inverter with SiC technology

Wall, S.; Hong, Xiao-Cong; Sha, Li; Xie, Jing-ren

doi:10.1049/iet-rpg.2017.0331

Cited by 8 publications

(9 citation statements)

References 19 publications

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“…The RMS value of this current ripple in each switching period (T sw = 1/f sw ) is given by (5). Calculating the RMS value of the current ripple over the half-line cycle (0 ⩽ θ ⩽ π) according to (6) the expression as function of V DC and M is obtained.…”

Section: Current Inductor Ripple On 2-level Three Phase Invertersmentioning

confidence: 99%

“…For medium power inverters around 100 kW designed with Si-based IGBTs, 2-level topologies lead to switching frequencies around 5-10 kHz being limited by the semiconductor losses [5]- [7]. With 3-level topologies it is possible to use IGBTs with lower voltage rate, resulting in lower losses and then, higher switching frequencies.…”

Section: Introductionmentioning

confidence: 99%

“…Despite of the higher cost of the SiC devices in comparison with its Si counterparts, the benefits in terms of efficiency, size, weight and reliability of SiC-based solutions, are gaining attention of the PV inverters market. [5]. Recent works such as [13], [14] show how despite of having higher cost on the SiC devices, the reduction on the passives can compensate that, and in addition how with SiC an inverter can be 3-10 times lighter compared with its Si-based version, reducing the installation costs.…”

Section: Introductionmentioning

confidence: 99%

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Magnetic Design of a 3-Phase SiC-Based PV Inverter With DC-Link Referenced Output Filter

et al. 2023

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The use of Silicon carbide (SiC) devices represents an improvement in terms of size, weight and efficiency of power converters. However, SiC-based solutions present high dv/dt and di/dt on the switching events, increasing the common-mode noise injected into the grid. To reduce the common-mode noise, three-phase inverters with a DC-link referenced output filter are widely considered in photovoltaic (PV) inverters connected to the grid. However, if the filter is DC-link referenced the inductor ripple is larger, and this must be considered for the AC inductor filter design. This work shows, on a PV inverter, the impact of that DC-link referenced filter on the current ripple of the inductor, and the improvement achieved with the use of SiC devices, increasing the switching frequency. A comparison in terms of weight, size, losses and materials costs is presented for different core materials and configurations.

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Section: Current Inductor Ripple On 2-level Three Phase Invertersmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Magnetic Design of a 3-Phase SiC-Based PV Inverter With DC-Link Referenced Output Filter

et al. 2023

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“…More new materials with high efficiency are still developed [1]. At the same time, many new power electronic components and power conversion topology have been proposed [2][3][4]. This study concerns power conversion topology.…”

Section: Introductionmentioning

confidence: 99%

Seven‐level power conversion system for solar power generation system

Wu¹,

Jou²,

Huang³

2020

IET Renewable Power Generation

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This study proposes a seven-level power conversion system for a solar power generation system. This seven-level power conversion system consists of a DC-DC power converter and a cascade DC-AC inverter. The cascade DC-AC inverter comprises a full-bridge inverter and a T-type inverter. The T-type inverter generates a three-level quasi-square-wave voltage and the full-bridge inverter provides a three-level high-frequency pulse voltage. The amplitude of the three-level quasi-squarewave voltage is double that of the three-level high-frequency pulse voltage, so seven levels of AC voltage are synthesized. Only the full-bridge inverter with lower DC bus voltage uses high-frequency switching so switching losses are effectively reduced. The novelty of the proposed cascade DC-AC inverter is that the output power of T-type inverter is controlled by regulating the DC bus voltage, so no real power is supplied from the full-bridge inverter and an independent power source is not required to provide power to the full-bridge inverter. The negative terminal voltage for solar cell array keeps almost constant to reduce the leakage current of proposed seven-level power conversion system. A hardware prototype with a digital signal processor controller is developed to verify the performance of seven-level power conversion system for a solar power generation system.

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“…There have been studies on 50 kW class solar power generation systems that are targeted at use in buildings and factories . The three‐phase photovoltaic (PV) inverters used in such systems typically use transformerless circuit configurations to achieve high efficiency and small volume/size.…”

Section: Introductionmentioning

confidence: 99%

Operation of a transformerless three‐phase PV inverter using multiple bidirectional choppers

Yamada

Hagiwara

2019

Electrical Engineering Japan

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A 50‐kW class three‐phase photovoltaic (PV) inverter typically applies a transformerless circuit configuration due to its high efficiency and small volume/size. On the other hand, the conventional PV inverter may suffer from the deterioration of solar panels due to a dc leakage current flowing through the stray capacitance of the solar panels. To solve this problem, this paper presents a transformerless three‐phase PV inverter consisting of multiple bidirectional choppers, which prevents the dc leakage current by maintaining a negative PV array voltage with respect to the ground potential to a dc voltage that is zero or higher. In addition, the size/volume of an ac filter can be reduced by applying the so‐called phase‐shifted PWM to the inverter. In this paper, the operating principles and control method of the inverter are discussed and the validity of the control method is verified by performing computer simulation using the “PSCAD/EMTDC” software package and conducting experiments using a 150‐V downscaled model.

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High‐efficiency PV inverter with SiC technology

Cited by 8 publications

References 19 publications

Magnetic Design of a 3-Phase SiC-Based PV Inverter With DC-Link Referenced Output Filter

Magnetic Design of a 3-Phase SiC-Based PV Inverter With DC-Link Referenced Output Filter

Seven‐level power conversion system for solar power generation system

Operation of a transformerless three‐phase PV inverter using multiple bidirectional choppers

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