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首页> 外文期刊>Power Electronics, IET >Digital control of isolated Cuk power factor correction converter under wide range of load variation
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Digital control of isolated Cuk power factor correction converter under wide range of load variation

机译：宽负载变化范围内的隔离式Cuk功率因数校正转换器的数字控制

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摘要

This study presents a novel digital double-loop control method, that is, inner current loop and outer voltage loop, for a single-stage isolated Cuk power factor correction (PFC) converter in continuous conduction mode (CCM). First, control law of current loop, consisting of a current term and a voltage term, is derived. Considering that inductance value of inductors varies with load change, an adaptive gain scheduling method is applied to change the current term. Second, control law of voltage loop is derived based on proportional-integral control with introducing linearisation and feedforward compensation. Meanwhile, a moving average filter is utilised to decrease ripple effect of output voltage, and thus smoother input signal for current loop and fast dynamic response for voltage loop are guaranteed. A 1600 W one-phase isolated Cuk PFC converter controlled by a digital signal processor is developed and achieves power factor higher than 0.99, total harmonic distortion of input current lower than 8.5% with load varying from 25 to 100% and fast dynamic response performance. Finally, a 4800 W three-phase AC–DC converter based on the above PFC converter is implemented and its performance additionally indicate that current sharing issue can be easy to deal with by using the proposed control method.
机译：这项研究提出了一种新颖的数字双环控制方法，即用于内部连续电流模式（CCM）的单级隔离式Cuk功率因数校正（PFC）转换器的内部电流环路和外部电压环路。首先，推导由电流项和电压项组成的电流环路控制律。考虑到电感的电感值随负载变化而变化，因此采用自适应增益调度方法来改变电流项。其次，基于比例积分控制并引入线性化和前馈补偿，推导了电压环路的控制规律。同时，利用移动平均滤波器来减小输出电压的纹波效应，从而保证了电流环路输入信号的平滑性和电压环路动态响应的快速性。开发了一种由数字信号处理器控制的1600 W单相隔离Cuk PFC转换器，其功率因数高于0.99，输入电流的总谐波失真低于8.5％，负载在25％至100％之间变化，并具有快速的动态响应性能。最后，基于上述PFC转换器实现了4800 W三相AC-DC转换器，其性能还表明，使用所提出的控制方法可以轻松解决均流问题。

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