A Comparative Analysis of Nonlinear Current Control Schemes Applied to a SEPIC Power Factor Corrector (original) (raw)
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Mathematics and Computers in Simulation, 2013
In this paper, a comparative analysis of three multi-loops control schemes dedicated to the single ended primary inductance converter (SEPIC) power factor corrector (PFC) is presented. The first control technique uses a robust hysteresis current controller; the second control strategy consists of a frequency-domain linear design of regulators on the basis of a small-signal averaged model of the converter, whereas the third control design method uses the input/output feedback linearization approach applied on the largesignal state-space averaged model of the converter. In order to verify and compare the performance of all control schemes, numerical simulations are carried out on a switching-functions-based model of the converter, which is implemented using Matlab/Simulink. The control systems are tested under both rated and disturbed operating conditions. The systems performance is evaluated in terms of source current total harmonic distortion (THD), input power factor, and DC voltage regulation toward load disturbances.
International Journal of Power Electronics, 2012
In this paper, a new general case switching-function-based model is proposed for a DC-to-DC single ended primary inductance converter (SEPIC). Compared to conventional buck or boost converters, this topology allows a low current ripple at the input for a relatively low level of the DC-bus voltage. The converter is used as a power factor correction (PFC) circuit for a single-phase rectifier and, based on the obtained model, steady-state analysis is performed and new design criteria were established for a proper selection of the inductors and capacitors. In order to verify the performance of the converter in PFC applications, a simple hysteretic-based feedback control is implemented and verified through simulations. For validation purpose, experiments are carried out on a 1kW laboratory prototype of the converter. The system performance is evaluated in terms of source current total harmonic distortion (THD), voltage regulation, robustness and dynamic behaviour.
IET Power Electronics, 2009
A new single-phase power factor corrector (PFC) based on the Sheppard-Taylor topology is studied. Compared with conventional PFCs, this topology facilitates a better input current tracking, lower voltage stresses across the devices and larger output voltage range for the same operating area. The converter is integrated as a PFC at the DC-end of a single-phase diode bridge. Pulse-width-modulated (PWM) multi-loops control schemes are proposed and developed in order to ensure a unity power factor at the AC-source side and a regulated voltage at the DC-load side. The first control method uses the simple and robust hystereticbased controller; the second employs a conventional PI regulator; and the third is based on the model nonlinearity compensation approach. The design of the last two control methods is based on the knowledge of a mathematical model that would accurately represent the converter. This model is developed in this paper using the state-space averaging technique, and then the small-signal transfer functions of the converter are derived for linear control design purpose. The performance of the different control strategies is evaluated through simulation experiments carried out on a numerical version of the converter. The implemented model of the converter is obtained by using the switching function technique. The control system is tested under both rated and disturbed operating conditions. The system performance is evaluated in terms of source current total harmonic distortion (THD), input power factor, DC voltage stabilization, and regulation following load variations.
This paper presents two current control techniques of an ac-dc boost converter to obtain unity power factor (PF). Single phase high power factor rectification is the most frequently accomplished using a boost converter. This converter reshapes distorted input current waveform to approximate a sinusoidal current that is in phase with the input voltage. There are several current control techniques for achieving a sinusoidal input current waveform with low distortion. Two typical techniques for power factor correction (PFC) are peak current mode control (PCMC) and hysteresis current mode control (HCMC). These control techniques are evaluated based on control strategy, circuit components, and total harmonic distortion of input current. The single phase ac-dc boost converter is operated in continuous conduction mode (CCM). Both control techniques are simulated in Matlab/Simulink program.
This paper presents various current control techniques of an ac-dc boost converter to obtain nearest unity power factor (UPF). Single phase high power factor rectification is the most frequently accomplished using a dual boost converter. This converter reshapes distorted input current waveform to approximate a sinusoidal current that is in phase with the input voltage. There are several current control techniques for achieving a sinusoidal input current waveform with low distortion. Two typical techniques for power factor correction (PFC) are pulse width mode control (PWMC) and hysteresis current mode control (HCMC) is very useful for power factor correction. These control techniques are evaluated based on control strategy, circuit components, and total harmonic distortion of input current. The single phase ac-dc dual boost converter is operated in continuous conduction mode (CCM). Both control techniques are simulated in Matlab/Simulink program.
The Analysis of Ac-DC Boost PFC Converter Based on Peak and Hysteresis Current Control Techniques
This paper presents two current control techniques of an ac-dc boost converter to obtain unity power factor (PF). Single phase high power factor rectification is the most frequently accomplished using a boost converter. This converter reshapes distorted input current waveform to approximate a sinusoidal current that is in phase with the input voltage. There are several current control techniques for achieving a sinusoidal input current waveform with low distortion. Two typical techniques for power factor correction (PFC) are peak current mode control (PCMC) and hysteresis current mode control (HCMC). These control techniques are evaluated based on control strategy, circuit components, and total harmonic distortion of input current. The single phase ac-dc boost converter is operated in continuous conduction mode (CCM). Both control techniques are simulated in Matlab/Simulink program.
Robust current-mode control of bridgeless single-switch SEPIC PFC converter
International Journal of Power Electronics and Drive Systems (IJPEDS), 2023
In this paper, the nonlinear model of the bridgeless single-switch AC-DC single-ended primary-inductor converter (SEPIC) in discontinuous conduction mode is derived. In addition, a robust control method is introduced to accommodate the variations in input voltage and load current. The current-mode controlled power converter is designed to operate in buck and boost modes. The proposed closed-loop SEPIC converter is simulated in MATLAB to validate the design approach. The current-mode control scheme is also compared with the conventional voltage-mode controller. It is confirmed that the proposed control scheme exhibits precise tracking performance and enhanced transient response under large disturbances.
TRANSSTELLAR JOURNALS, 2018
With the rapid development in the power electronics devices, DC power supplies are the wide range of application, including residential, commercial, and aerospace and traction system and SMPS. Normally, the conventional continuous conduction mode boost converter has been widely used for power factor correction (PFC) applications because of its high input power factor and simplicity, though it suffers from conduction loss in the input rectifier bridge and switching loss due to the high switching frequency. The efficiency decreases rapidly under the lower input voltage or the light-load work condition. In this paper, a novel Enabling Window Control (EWC) method is used to reduce the switching loss and to improve the efficiency. Moreover, electromagnetic interference noise and driving loss of the main switch can be reduced with the EWC method. And also we discuss and compare some of the dc/dc converters like buck, boost, buck-boost, cuk and sepic with and without using EWC method. Simulation results are obtained in the MATLAB/SIMULINK for the effectiveness of the study.
Analysis and design of an isolated single-phase power factor corrector with a fast regulation
Electric Power Systems Research, 2011
This paper presents an analysis and a modeling approach to obtain a small-signal model design and the digital implementation of a linear control technique for single-phase boost power factor correctors (PFC). Such converters present nonlinear characteristics and approximations of them are used to drive the models. The proposed circuit significantly improves the dynamic response of the converter to load steps without the need of a high crossover frequency of the voltage loop by adding low-pass filter. So, a low distortion of the input current is easily achieved. This controller has been verified via simulation in Simulink using a continuous time plant model and a discrete time controller. Real-time implementation is performed on an experimental test bench utilizing a rapid prototyping tool. The controller is experimentally confirmed for steady-state performance and transient response.
Power factor correction AC-DC boost converter using PI-hysteresis current control
International Journal of Power Electronics and Drive Systems, 2023
The AC line input voltage is frequently rectified by single-phase diode rectifiers and filtered using sizable electrolytic capacitors. The capacitor draws current in brief pulses, so harmonics distort the line current, resulting in high losses. Harmonics and line current distortions harm the unity power factor and efficiency. This article adopts a simple single-stage AC-DC converter with a high-power factor and low total harmonic distortion. The PI hysteresis current control was utilized to reduce the total harmonic distortion and increase the power factor at full load. The PI controller was added to the outer voltage loop to regulate the output voltage. Ziegler-Nichol's tuning method was used to determine the controller gain levels. Simulation results were obtained for the AC-DC converter at a constant switching frequency to show the benefits of the proposed control method, which has a low total harmonic distortion and a high-power factor compared with cases without a controller. The proposed control method is accurate and efficient for achieving the power factor correction converter. Besides, the proposed control was stable during dynamic and steady-state responses.