Half cycle pairs method for harmonic analysis of cycloconverter voltage waveform

Ashraf, Naveed; Hanif, Athar; Farooq, Umar; Asad, Muhammad Usman; Rafiq, Faiqa

doi:10.1109/icosst.2013.6720613

Cited by 8 publications

(5 citation statements)

References 7 publications

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“…All even harmonic components are zero for the b n coefficient, leaving only odd harmonic components. As a result, the Fourier series expression of the traditional m = 3 frequency conversion output voltage can be written by Equation (48) using the half-cycle pairs method [38].…”

Section: Analytical Harmonics Analysis For the Proposed Ac/ac Power C...mentioning

confidence: 99%

A Direct Single-Phase to Three-Phase AC/AC Power Converter

et al. 2022

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The traditional DC-link indirect AC/AC power converters (AC/DC/AC converters) employ two-stage power conversion, which increases the circuit complexity gate driving challenges, placing an excessive burden on the processor while implementing complex switching modulation techniques and leads to power conversion losses due to the use of a large amount of controlled power semiconductor switches. On the contrary, the traditional direct AC/AC voltage controllers, as well as frequency changers, suffer from high total harmonic distortion (THD) problems. In this paper, a new single-phase to three-phase AC/AC step-down power converter is proposed, which utilizes a multi-linking transformer and bilateral triode thyristors (TRIACs) as power semiconductor switches. The proposed direct AC/AC power converter employs single-stage power conversion, which mitigates the complexity of two-stage DC-link indirect AC/AC converters and traditional single-stage AC/AC frequency changers. Instead of using high-frequency pulse width modulated gate driving signals, line frequency gate pulses are used to trigger the TRIACs of the proposed AC/AC converter, which not only aids in reducing the power loss of the converter but also mitigates the cost and complexity of gate driver circuits. The proposed AC/AC converter reduces the THD of the output voltage significantly as compared to traditional direct AC/AC frequency changers. The performance of the proposed AC/AC converter is validated against RL and induction motor load in terms of overall THD and individual harmonic components through MATLAB/Simulink environment. A reduced-scale laboratory prototype is built and tested to evaluate the performance of the proposed AC/AC power converter. The experimental and simulation outcomes reveal the feasibility and excellent features of the proposed single-phase to three-phase AC/AC converter topology.

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Section: Analytical Harmonics Analysis For the Proposed Ac/ac Power C...mentioning

confidence: 99%

A Direct Single-Phase to Three-Phase AC/AC Power Converter

et al. 2022

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“…The output wave-form of the conventional AC/AC converter is always half-wave symmetry. Hence, using the technique of the half-cycle pairs method [26], the Fourier series expression of the conventional 3:1 frequency conversion output voltage can be written as follows:…”

Section: Harmonics Analysis Of the Proposed Ac/ac Power Convertermentioning

confidence: 99%

“…The hybrid filter is very effective for the reduction of the harmonic problem of the output voltage because it is a combination of active and passive filters. However, the circuit topology of the hybrid filter is very complex, in relative terms [26]. Controller circuits are used in most of hybrid filters, which need an extra controller board with a sensing mechanism and a large number of other parallel filter components [27].…”

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confidence: 99%

A New Generalized Step-Down Single-Stage AC/AC Power Converter

et al. 2020

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Most traditional AC/AC power converters suffer from power quality problems and multi-stage power conversion losses. The rectifier and inverter-based AC/AC converter topology not only increases multi-stage power conversion losses, but also increases the volume, weight, and cost, and decreases the longevity of the converter due to the DC-link capacitor, line filter and electromagnetic interference (EMI) filter. High-frequency (about 10 kHz) switching advanced pulse width modulation techniques are generally used in order to compensate the power quality problems, which increase the switching losses and introduce the EMI problems. In this paper, a new generalized step-down single-stage line-frequency switching AC/AC power converter topology is proposed. The proposed converter uses line-frequency switching, and does not require any pulse width modulation techniques. The proposed topology offers promising performances in terms of lower order harmonics, total harmonic distortion, the elimination of DC-link capacitors and EMI filters, and switching losses. The circuit was designed and simulated in a MATLAB/Simulink environment. A scaled-down laboratory prototype of the proposed topology was developed in order to validate the feasibility. The experimental and simulation results reveal the feasibility of the proposed generalized step-down single-stage converter topology, and its excellent features.

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“…The output voltage waveform in variable frequency operation is nonsinusoidal due to generated harmonics. A pulse selective approach as discussed in [34,35] is employed to compute the harmonic contents analytically by decomposing a complex nonsinusoidal to its parent sinusoidal waveforms. As the frequency of the output voltage is changed in discrete steps, a step change of 25 Hz is taken for harmonic analysis.…”

Section: Harmonic Analysismentioning

confidence: 99%

A Single‐Phase Buck‐Boost Matrix Converter with Low Switching Stresses

Ashraf

Izhar

Abbas

2019

Mathematical Problems in Engineering

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The suggested single-phase ac-to-ac matrix converter operated with inverting and noninverting characteristics may solve the grid voltage swell and sag problem in power distribution system, respectively. It is also employed as a direct frequency changer for domestic induction heating. The output voltage is regulated through duty cycle control of high frequency direct PWM (DPWM) and indirect PWM (IDPWM) switching devices. The DPWM control switches control the switching states of IDPWM switching devices. The inverting and noninverting characteristics are achieved with low voltage stresses and hence low dv/dt across the high and low frequency-controlled switches. This reduces their voltage rating and losses. The high voltage overshoot problem in frequency step-up operation is also analyzed. The sliding mode (SM) controller is employed to solve this problem. Pulse selective approach determines the power quality of load voltage. The validity of the mathematically computed values is carried out by modelling the proposed topology in MATLAB/Simulink environment and through hardware results.

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Half cycle pairs method for harmonic analysis of cycloconverter voltage waveform

Cited by 8 publications

References 7 publications

A Direct Single-Phase to Three-Phase AC/AC Power Converter

A Direct Single-Phase to Three-Phase AC/AC Power Converter

A New Generalized Step-Down Single-Stage AC/AC Power Converter

A Single‐Phase Buck‐Boost Matrix Converter with Low Switching Stresses

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