Analysis of the Admittance Component for Digitally Controlled Single-Phase Bridgeless PFC Converter

Cho, Younghoon; Mok, Hyung-Soo; Lai, Jih-Sheng

doi:10.6113/jpe.2013.13.4.600

Cited by 8 publications

(7 citation statements)

References 23 publications

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“…Considering PWM modulation delay and digital control delay, 41 the transfer function of current control loop in Figure 2 can be approximated as…”

Section: Robustness Analysismentioning

confidence: 99%

Cascaded model‐free predictive control for single‐phase boost power factor correction converters

Zhang

et al. 2021

Intl J Robust & Nonlinear

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Conventionally, the dual-loop PI controllers are designed for the single-phase boost power factor correction (PFC) converters operating under continuous conduction mode (CCM), which is not available to perform rapid adaptations to plant uncertainties caused by the different operation modes and the parameter variations. In order to improve the control performance and robustness, a cascaded model-free predictive control (MFPC) scheme is proposed based on the unified ultra-local model under CCM and discontinuous conduction mode (DCM) for the single-phase boost power factor correctors. Different from the traditional sluggish PI controllers, the proposed control law is adaptive to the operation mode and sudden variations with the algebraic identification technique, thus providing high-quality line current and fast dynamic characteristic for the full power operating range. Comparative simulations and experiments with PI control scheme are provided to certificate the effectiveness of the proposed control scheme.

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“…Considering PWM modulation delay and digital control delay, 41 the transfer function of current control loop in Figure 2 can be approximated as…”

Section: Robustness Analysismentioning

confidence: 99%

Cascaded model‐free predictive control for single‐phase boost power factor correction converters

Zhang

et al. 2021

Intl J Robust & Nonlinear

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“…Primary winding voltage (350V/div) Power factor correction function was implemented with repetitive control to ensure low harmonic distortion [29]- [30]. Fig.…”

Section: Afe Converter Stagementioning

confidence: 99%

A 15-kV class intelligent universal transformer for utility applications

Lai

Lai²,

Moon

et al. 2016

2016 IEEE Applied Power Electronics Conference and Exposition (APEC)

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This paper discloses the development of 15-kV class intelligent universal transformer (IUT) to show system level design, circuit topology, and prototype test results. The complete system is split into two stages: (1) high-voltage ac to low-voltage dc and (2) low-voltage dc to low-voltage ac. With the adoption of silicon carbide (SiC) devices, the high-voltage front-end ac to low voltage dc conversion stage achieves 98.4% efficiency, and the complete power stage can be naturally cooled. With the adoption of auxiliary resonant soft-switching inverter, the second stage achieves 99.2% efficiency.Overall the system has been demonstrated at 97.5% efficiency without forced-air cooling. Extended 8-hour testing was conducted to ensure long-term operation reliability. Overall efficiency and voltage regulation were compared with that of a conventional transformer for justification of IUT adoption.

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“…By choosing Vdc and Mmax as 400 V and 0.9, the maximum allowable Kd is obtained as 37.34. In sum, the range of Kd considering the experimental parameters is represented as: In Figure 5, the feed-forward voltage v ff is directly added, and it compensates for the admittance effect in the entire control loop [19]. With this configuration, the voltage error e o between the voltage reference v * o and v o is characterized as follows:…”

Section: Proposed Single-loop Voltage Control Strategy With the Activmentioning

confidence: 99%

“…In Figure 5, the feed-forward voltage vff is directly added, and it compensates for the admittance effect in the entire control loop [19]. With this configuration, the voltage error eo between the voltage reference v * o and vo is characterized as follows: Figure 3.…”

Section: Proposed Single-loop Voltage Control Strategy With the Activmentioning

confidence: 99%

A Single-Loop Repetitive Voltage Controller with an Active Damping Control Technique

et al. 2017

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This paper proposes a single-loop repetitive voltage control strategy which incorporates the active damping control feature for single-phase uninterruptible power supply (UPS) applications. The proposed method reduces the effect of the LC resonant peak, which limits the control bandwidth and deteriorates the stability of the entire control loop by effectively increasing the damping component. Due to the increased stability margin, a repetitive controller working together with a proportional-resonant (PR) controller can be easily adopted. Moreover, the voltage error is minimized even under severe non-linear load conditions. It is confirmed that the proposed single-loop controller achieves excellent and stable voltage regulation performance by evaluating the entire loop-gain of the system and the output impedance. Both the simulation and the experimental results for a 1.5 kW UPS inverter show agree well with the analyses, and the excellence of the proposed method has been verified.

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Analysis of the Admittance Component for Digitally Controlled Single-Phase Bridgeless PFC Converter

Cited by 8 publications

References 23 publications

Cascaded model‐free predictive control for single‐phase boost power factor correction converters

Cascaded model‐free predictive control for single‐phase boost power factor correction converters

A 15-kV class intelligent universal transformer for utility applications

A Single-Loop Repetitive Voltage Controller with an Active Damping Control Technique

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