A PWM method for reduction of switching loss in a full-bridge inverter

Lai, R.-S.; Ngo, Khai D. T.

doi:10.1109/apec.1994.316410

Cited by 33 publications

(34 citation statements)

References 8 publications

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“…A new inverter topology called H5 was patented by SMA in 2005 [52]. As specified by its name, it is a modified H-bridge, where in the DC-link (positive bus) an extra fifth switch is added, as presented in Figure 7.…”

Section: H5 Inverter (Sma)mentioning

confidence: 99%

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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Abstract:The research significance of various scientific aspects of photovoltaic (PV) systems has increased over the past decade. Grid-tied inverters the vital elements for the effective interface of Renewable Energy Resources (RER) and utility in the distributed generation system. Currently, Single-Phase Transformerless Grid-Connected Photovoltaic (SPTG-CPV) inverters (1-10 kW) are undergoing further developments, with new designs, and interest of the solar market. In comparison to the transformer (TR) Galvanic Isolation (GI)-based inverters, its advantageous features are lower cost, lighter weight, smaller volume, higher efficiency, and less complexity. In this paper, a review of SPTG-CPV inverters has been carried out. The basic operational principles of all SPTG-CPV inverters are presented in details for positive, negative, and zero cycles. A comprehensive analysis of each topology has been deliberated. A comparative assessment is also performed based on weaknesses, strengths, component ratings, efficiency, total harmonic distortion (THD), semiconductor device losses, and leakage current of various SPTG-CPV inverters schemes. Typical PV inverter structures and control schemes for grid connected three-phase system and single-phase systems are also discussed, described, and reviewed. Comparison of various industrial grids-connected PV inverters is also performed. Loss analysis is also performed for various topologies at 1 kW. Selection of appropriate topologies for their particular application is thoroughly presented. Then, discussion and forthcoming progress are emphasized. Lastly, the conclusions are presented. More than 100 research publications on the topic of SPTG-CPV inverter topologies, configurations, and control schematics along with the recent developments are thoroughly reviewed and classified for quick reference.

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Section: H5 Inverter (Sma)mentioning

confidence: 99%

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

et al. 2018

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“…In most applications, three-level (3L) modulation, which is called unipolar pulse width modulation (UPWM), is preferred to the two-level (2L) modulation, which is also called bipolar PWM (BPWM), because UPWM ensures the half of the dv/dt output voltage stress that BPWM results in. As well as UPWM, single phase-leg switched modulation or hybrid PWM (HPWM) generates 3L output voltage [11], [13]. Nevertheless, these PWM methods have not been studied for three-phase HBVSCs elaborately.…”

Section: Introductionmentioning

confidence: 99%

“…In 3L-HB-VSCs, the single leg switched or hybrid PWM method (Fig. 6) modulates the leg of SA1&SA2 with the switching frequency f S while the other leg of SA3&SA4 with the electrical frequency f e [11], [13]. Hence, the switches are utilized similarly to those of the NPC for PF≈1.…”

Section: Introductionmentioning

confidence: 99%

A single leg switched PWM method for three-phase H-Bridge Voltage Source Converters

Senturk

Munk‐Nielsen

Teodorescu

et al. 2009

2009 IEEE Energy Conversion Congress and Exposition

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“…This technique, called Hybrid Pulse Width Modulation (HPWM), was proposed with the aim of improving the FB efficiency, since it allows using switches with lower conduction losses in the leg modulated at grid frequency. 19 But in the switching period in which v dm alternates from one half cycle to the other, a voltage step, with amplitude equal to V PV , takes place in v tcm . As it has been evaluated in Equation (9), the ground current will show a strong peak unless the EMI filter includes a common mode inductor big enough to withstand the voltage steps in v tcm .…”

Section: Common Mode Model Of the Systemmentioning

confidence: 99%

Ground currents in single‐phase transformerless photovoltaic systems

Gubía

Sanchis

Ursúa

et al. 2007

Progress in Photovoltaics

276

102

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The relative weight of the energy generated by means of renewable sources is constantly increasing. Among all these sources, the photovoltaic (PV) systems present the higher and more stable relative growth. However, the PV system is still too expensive and a significant effort is being done to increase the efficiency and reduce the cost. Concerning the PV inverters, this has lead to the elimination of the low frequency (LF) transformer that has been traditionally included. The LF transformer provides isolation from the grid but reduces the PV inverter efficiency and increases its size and cost. However, the elimination of the transformer might generate strong ground currents, which become now an important design parameter for the PV inverter. The ground currents are a function of the system stray elements. However, there is no simple model and procedure to study the common mode behavior of a PV system, which is required to analyze the ground currents. In this paper, a comprehensible model is proposed which provides a better understanding of the common mode issue in single-phase transformerless PV systems. In addition, a procedure is developed to analyze the global performance, efficiency, grid current quality, and common mode behavior of a PV inverter as a function of its particular structure and modulation technique.

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A PWM method for reduction of switching loss in a full-bridge inverter

Cited by 33 publications

References 8 publications

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

A Review on Recent Advances and Future Trends of Transformerless Inverter Structures for Single-Phase Grid-Connected Photovoltaic Systems

A single leg switched PWM method for three-phase H-Bridge Voltage Source Converters

Ground currents in single‐phase transformerless photovoltaic systems

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