Abstract
As the nonlinear structure of the boost ac/dc topology, the PFC is difficult to be controlled. The average state space theory has revealed that the choke current is determined by duty-ratio coupled with input voltage and bus voltage, which makes the high-performance sine-wave current track control more challenging. To remove disturbing variables and reduce the zero-crossing distortion, the decoupling control strategy is presented. Also, it is shown in this paper that the variable inductance has a great influence on PFC and THDI. As the inductor in boost converter varies with the current, a compensating coefficient of current is also proposed. The decoupling strategy and the inductor compensation strategy are implemented on a UPS with three phase input voltage. Numerical simulation and experimental results has indicated the high-performance of these control strategy.
Highlights
As a non-isolate ac/dc PFC converter, the boost converter is widely used in various industrial applications due to its simple circuit structure, high reliability, low cost and low current ripple in high frequency
Its realization algorithm includes looking up table and following mains supply. The former is able to offer a better performance in terms of total harmonic distortion (THD), while the latter is able to offer a better performance in terms of power factor (PF)
The look-up table needs a phase locked loop (PLL) accurately detect the zero crossing of sinusoidal wave, which will increase the complexity of the control system and load of the CPU [2]
Summary
As a non-isolate ac/dc PFC converter, the boost converter is widely used in various industrial applications due to its simple circuit structure, high reliability, low cost and low current ripple in high frequency. Its realization algorithm includes looking up table and following mains supply The former is able to offer a better performance in terms of total harmonic distortion (THD), while the latter is able to offer a better performance in terms of power factor (PF). The look-up table needs a phase locked loop (PLL) accurately detect the zero crossing of sinusoidal wave, which will increase the complexity of the control system and load of the CPU [2]. When the input voltage is very low, boost IGBT works at an almost 100% duty ratio, which will lead to the phase lead of input current and results in zero distortion, especially under high ac line frequencies [5]. In [7], a duty-ratio feedforward control approach is proposed. Due to the pure integrator, a compensating coefficient could exactly offset the fluctuation of inductance value which plays a great role in the control
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