An Improved Bipolar Voltage Boost AC Voltage Controller With Reduced Switching Transistors

Ashraf, Naveed; Abbas, Ghulam; Ullah, Nasim; Alkhammash, Hend I.; Zubair, Muhammad

doi:10.1109/access.2021.3091497

Cited by 8 publications

(6 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…The power quality of this stage is also maintained at an acceptable range with the help of harmonic suppression filters. This power conversion method is complicated and is not favorable as its implantation requires a multilevel conversion process [10][11][12].…”

Section: Introductionmentioning

confidence: 99%

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

et al. 2022

Self Cite

View full text Add to dashboard Cite

Variable voltage and frequency are required to govern the torque-speed characteristics of many industrial drive systems. Traditionally, this is achieved with a power converting system implemented with multistage converters. This technology is based on rectifying AC power into DC and then DC into AC with an inverter circuit. The power quality concerns of both conversion stages are tackled by selecting high switching frequency PWM control and harmonics mitigation filters. Also, using a bulky DC-link capacitor is one of the big sources of low system reliability, so this approach increases the conversion losses, circuit, and control complications. The frequency step-down conversion is very attractive with direct AC-AC converters as it has a simple control and circuit structure, but these converters face poor power quality challenges once the output frequency is decreased with respect to an input. In these converters, the total harmonic distortion (THD) of the output voltage becomes very poor once the output frequency is reduced. The problem of high THD of the output is addressed in the power converting circuits implemented with line frequency multi-winding transformers. The required number of output winding and switching devices (diodes and thyristors) increases once the value of the output frequency is decreased. This will increase the overall volume, cost, and losses. The use of a bulky and costly line frequency transformer may be eliminated if AC voltage controllers have non-inverted and inverted voltage buck capabilities, such existing topologies either have complex control schemes or require a large number of operating devices. Therefore, in this research article, a new transformerless frequency step-down converter employing fewer devices is proposed. This approach is realized with a high-frequency controlled rectifier for the required voltage stabilization and a low-frequency inverter bridge for frequency control. Its validation is supported by the results attained from Simulink and practical-based prototypes.

show abstract

Section: Introductionmentioning

confidence: 99%

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

et al. 2022

Self Cite

View full text Add to dashboard Cite

show abstract

“…m current as follows: (6) and the capacitors CP and CQ can be calculated ripple β%of max. m voltage as well as- (7) (fsw) switching frequency and (Po) o/p power is respectively. Furthermore, the maximum voltages of capacitors and maximum currents of inductors are calculated by neglecting the voltage and current waveforms.…”

Section: Component Parameters Designmentioning

confidence: 99%

“…These days, PWM converters based on MOSFETs or insulated gate bipolar transistors (IGBTs) have recently gained a lot of attention due to various their complexity and prospective ability to achieve high efficiency, power quality, and reliability. In [7] the concept of switching cells is isolated for HFT isolation. In [8] the series connection of MOSFETs and a diode produces a switching cell structure, without causing damage to switch devices by three topologies can be formed by coupled inductors withstand all dead-time with overlap-time in this configuration.…”

Section: Introductionmentioning

confidence: 99%

Performance Analysis of Direct Single-Phase AC-AC Converter with Novel Switching Strategy

Sharma¹

2022

IJSREM

View full text Add to dashboard Cite

Abstract—Recently, direct-type ac-ac converters have attracted considerable attention for voltage magnitude variation due to the reduced number of component requirements. This paper introduces a direct single-phase ac-ac converter with a novel switching strategy for UPF and non-UPF load. The suggested converter's circuit configuration uses six power MOSFETs and two inductors at high switching frequency to reduce the size. The proposed switching strategy reduces the losses of semiconductor devices with a safe commutation. The performance analysis of the proposed converter has been carried out for high power quality operation with almost unity PF at the i/p and low THD at the output for 400W resistive and inductive loads. The simulations have been carried out on MATLAB-2019b. Keywords—AC-AC Converter, buck, switching strategy, UPF, and Non-UPF load.

show abstract

“…This situation requires the addition of voltage in the line that may achieve with the non-inverted output of the voltage stabilizers. The other type of voltage variation is characterized as voltage swell in which the line rms voltage is boosted to 110% to 180% of its normal rated value for a few milliseconds [4]. The correction of this situation requires injecting the voltage of opposite polarity of the line that can obtain from the inverted output of the voltage controllers.…”

Section: Introductionmentioning

confidence: 99%

“…The converter employed with the structure reported in [3] has bipolar voltage buck characteristics, and its application is only limited to the compensation of the low depth level power quality issues. Conversely, the voltage controllers as applied in [4] have only voltage boosting features. It can only tackle the power quality problem where the voltage correcting level is more than 50%.…”

Section: Introductionmentioning

confidence: 99%

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

et al. 2021

Self Cite

View full text Add to dashboard Cite

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.

show abstract

An Improved Bipolar Voltage Boost AC Voltage Controller With Reduced Switching Transistors

Cited by 8 publications

References 23 publications

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

A Transformerless AC-AC Converter with Improved Power Quality Employed to Step-Down Power Frequency at Output

Performance Analysis of Direct Single-Phase AC-AC Converter with Novel Switching Strategy

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

Contact Info

Product

Resources

About