Duty Ratio Calculation for Digitally Feed Forward Controlled Parallel Connected Buck-Boost PFC

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

Vandevelde

Belie

2021

Self Cite

The voltage regulator is designed based on a transfer function of the system pre-converter with ideal current control. This transfer function is obtained by first obtaining the system equation for the preconverter with ideal current control. Subsequently, we look for a possible regime solution for a sinusoidal power supply and then arrive at the transfer function via linearization of the system equation around the solution in regime. The calculations are verified by using Matlab/Simulink on the system with considering two buck boost converters connected in parallel. The control scheme used in simulation is feed forward control scheme.

Section: Introductionmentioning

confidence: 70%

Section: Case Study With Simulations and Resultsmentioning

confidence: 99%

Efficiency and Transfer function calculation of the Buck-Boost converter with ideal flow control

2021 23rd European Conference on Power Electronics and Applications (EPE'21 ECCE Europe)

Vandevelde

Belie

2021

Self Cite

“…5. The feed forward control is about the calculation of the duty cycle values responsible for the system's unity power factor [25], [26]. For input voltage V in(t), output voltage Vout(t), d(n) as duty cycle for n th switching cycle, t(n) and t(n+1) as the beginning instant of n th and (n+1) th switching cycle and Ts as the switching period, the equations for the ON and OFF state of conventional boost converters are given by equation ( 4) and ( 5) respectively;…”

Section: B Feed Forward Control Schemementioning

confidence: 99%

Pulse Width Modulation Harmonic Elimination Method for Common and Differential Mode Circulating Currents

2022 IEEE International Conference on Environment and Electrical Engineering and 2022 IEEE Industrial and Commercial Power Syst

Vandevelde

Belie

2022

Self Cite

A Pulse Width Modulation method is presented in this paper for the harmonics and circulating current reduction in the power converters system. The power converter considered for this research work is a boost converter connected in an interleaved topology in a single setup. The Common-Mode Circulating Current CMCC are studied in detail in this interleaved topology setup. For the Differential-Mode Circulating Current DMCC, these two identical interleaved setups are then connected in parallel. A PWM control method is suggested for harmonic elimination and control of circulating currents inside the circuit. This method results are compared with Feed Forward and AICMC control methods. Simulation results are presented to show the effectiveness of this proposed model.

“…Considering Equations ( 25) and (26) and I s (k) from Equation (30), feed-forward control is derived for N parallel-connected buck-boost PFCs operating in CCM and DCM [35], respectively, by Equations ( 31) and (33):…”

Section: Feed-forward Control Technique Improvement By Optimization T...mentioning

confidence: 99%

“…The value of the gradient is obtained from Equation (35). Equation ( 36) is iteratively implemented until the objective function is minimized to achieve a higher power factor for the system.…”

Section: Feed-forward Control Technique Improvement By Optimization T...mentioning

confidence: 99%

Analysis and Demonstration of Control Scheme for Multiple Operating Modes of Energy Storage Converters to Enhance Power Factor

Vandevelde²,

Belie³

2022

Mathematics

Self Cite

Rectifiers are required by the devices connected to the distribution end of the electrical power networks for AC/DC conversion. The line current becomes non-sinusoidal when a capacitor with a significant value is used to mitigate the output voltage ripple. This type of converter emulates a non-resistive impedance to the grid, due to which a bend occurs in the shape of the line current, which results in high total harmonic distortion and a low power factor. For perceiving sinusoidal current, power factor correction techniques are required. A digital controller for parallel-connected buck-boost power factor correctors is presented in this article to maintain a constant output voltage and to deal with circulating currents amongst parallel-connected converters. The proposed digital supervisory controller also regulates the input and line currents to keep them sinusoidal according to the input supply voltage to maintain the high power factor of the system. In this paper, using the differential equations of a buck-boost converter, the duty cycle calculations are performed for both Continuous Conduction Mode (CCM) and Discontinuous Conduction Mode (DCM), which are responsible for providing a unity power factor. A supervisory controller encompasses a feed-forward control algorithm for tuning model parameters for eliminating the harmonics from the line current. The proposed scheme helps calculate duty cycles which provides a unity power factor and minimizes the circulating currents. The proposed method was simulated in MATLAB/Simulink and their digital-hardware validation testing was also performed using C2000 MCU Launchpad.