Six-Leg Single-Phase AC–DC–AC Multilevel Converter With Transformers for UPS and UPQC Applications

Lacerda, Rodrigo P. de; Jacobina, Cursino B.; Fabricio, Edgard L. L.; Rodrigues, Phelipe L. S.

doi:10.1109/tia.2020.3003856

Cited by 16 publications

(6 citation statements)

References 29 publications

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“…The use of a z-source network in the converter not only addresses the shoot-through issue but also helps in the adjustment of the required voltage gain. The existing topologies of the indirect AC-AC converters are reported in [17][18][19][20][21]. The stability analysis and several modulation schemes for a DC-link capacitor are stated in [17,18].…”

Section: Literature Reviewmentioning

confidence: 99%

“…The stability analysis and several modulation schemes for a DC-link capacitor are stated in [17,18]. The power quality-related issues in AC-DC-AC converters are reported in the multilevel converter approach in [19][20][21]. The DC-link capacitors employed in indirect AC-AC converters are electrolytic capacitors that are sizeable and have short operation life.…”

Section: Literature Reviewmentioning

confidence: 99%

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A Single-Phase Compact-Sized Matrix Converter with Symmetrical Bipolar Buck and Boost Output Voltage Control

et al. 2022

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The development of single-phase symmetrical bipolar voltage gain matrix converters (MC) is growing rapidly as they find their application in power systems for dynamic restoration of line voltages, high voltage AC–DC converters, and variable frequency controllers for many industrial processes. However, the existing trend in matrix converter technology is a buck–boost operation that has inherently serious issues of high voltage and current surges or stresses. This is a big source of the high voltage and current rating of semiconductor switching devices. There is also a problem of high ripples both for voltage as well for current, requiring large size of filtering capacitors and inductors. The non-symmetrical control of the voltage gain increases the control complication. A large count of operating transistors is critical regarding their cost, size, and power conversion losses, as the space and cost required by their gate control circuits are much larger than the size and cost of the switching transistors. Thus, in this research work, a new single-phase MC is introduced only employing six fully controlled switching devices, ensuring similar operation or outputs as is obtained from the existing topologies that require the use of eight or more fully controlled switching devices, and the reduction by two or more switching transistors helps to compact the overall size and lower the overall cost. The separation in its voltage buck and boost operation enables smooth control of the voltage gain through duty cycle control. The low values of the voltage and current surges reduce the power rating and losses of the switching devices. The flow of the current in the filtering inductor is kept unidirectional to avoid the current interruption and reversal problem once the operation of the converter is abruptly switched from inverting to non-inverting and vice versa. All these factors are comprehensively detailed through the circuit’s description and comparative analysis. Simulation and practical results are presented to confirm the effectiveness of the developed circuit topology.

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Section: Literature Reviewmentioning

confidence: 99%

Section: Literature Reviewmentioning

confidence: 99%

A Single-Phase Compact-Sized Matrix Converter with Symmetrical Bipolar Buck and Boost Output Voltage Control

et al. 2022

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“…V o = DV s (10) By employing a similar methodology, the voltage step-down inverting behavior of the proposed circuit can also be validated with equivalent circuits and mathematical equations. This mode produced an inverted form of the input voltage at the output, and this is simply turning on the low-frequency transistors T r4 , T r5 and T r2 , T r6 for positive and negative input voltage by maintaining the switching role of T r1 and T r3 unchanged.…”

Section: Non-inverting and Inverting Buck Operationmentioning

confidence: 99%

“…The traditional way to resolve these issues is the use of indirect approaches of AC-AC conversion [7][8][9][10]. That requires power conversion in two stages where a DC-link capacitor is a mandatory requirement between the two converters.…”

Section: Introductionmentioning

confidence: 99%

“…The second converting stage is responsible for DC to AC conversion, and once again, a complex control arrangement is required to tackle the low power quality. The other approach to address and tackle the low power quality issues is the execution of power conversion in multistage [8] or multilevel configuration [9,10]. This overall arrangement is complicated to realize, and DC-link capacitors are a big source of poor system reliability [11].…”

Section: Introductionmentioning

confidence: 99%

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A New Dual Polarity Direct AC-AC Voltage Regulator Ensuring Voltage Step-Up and Step-Down Capabilities

et al. 2021

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The problem of voltage sag and swell is one of the major reasons for low-quality power in the distribution system. Normally, it results from the system’s faults, including line-to-ground and line-to-line, non-linear characteristics of loads and sources. Its effect is very serious for the critical loads as their performance is very sensitive to the variation in voltage. The stabilization of voltage is a mandatory requirement in such a situation. The correction of such problems requires the addition and subtraction of the voltage once the line voltage is decreased and increased. This behavior of the correcting voltage is ensured by the use of voltage controllers that can convert a constant input voltage into a non-inverted and inverted variable form. Their voltage gains depend on the depth level of the problem. The voltage buck and boost capabilities of the AC voltage stabilizers can tackle the problems having any depth level. The smartness of such a system depends on the number of electronic devices as they are the key elements in the power conversion system. Therefore, this research proposes a new AC voltage controller with fewer solid-state devices. Its overall impact is low volume and cost. The validation of the introduced approach is ensured with the help of simulation modeling and results gained from the practical setup.

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A critical analysis of different power quality improvement techniques in microgrid

Choudhury,

Sahoo

2024

e-Prime - Advances in Electrical Engineering, Electronics and E

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Six-Leg Single-Phase AC–DC–AC Multilevel Converter With Transformers for UPS and UPQC Applications

Cited by 16 publications

References 29 publications

A Single-Phase Compact-Sized Matrix Converter with Symmetrical Bipolar Buck and Boost Output Voltage Control

A Single-Phase Compact-Sized Matrix Converter with Symmetrical Bipolar Buck and Boost Output Voltage Control

A New Dual Polarity Direct AC-AC Voltage Regulator Ensuring Voltage Step-Up and Step-Down Capabilities

A critical analysis of different power quality improvement techniques in microgrid

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