考虑宽负载变化的有源电容等效容值控制与损耗分析

二端口有源电容是一种仅有2个引出端口而无需任何附加电气连接端子的有源电路。然而,基于传统控制方法的有源电容等效容值在理想情况下是无穷大的,这不适用于某些需要精确容值的无源电容应用场合。为此,提出了一种基于二端口有源电容的等效容值控制方法,该方法能根据不同的应用需求实现对有源电容的精准容值控制。首先,对有源电容的阻抗进行建模与分析;然后,通过基于单相整流器的仿真分析,将通过等效容值控制的有源电容与具有相同容值的无源电容进行对比,以验证控制精度;最后,通过与传统有源电容控制方式在功率损耗和动态响应速度方面进行对比,结果验证了所提出等效容值控制方法的有效性。

Equivalent Capacitance Control and Power Loss Analysis of Active Capacitor Considering Wide Load Variation

The two-terminal active capacitor concept based on power electronic circuits is proposed recently to exceed the physical limit of the passive capacitor. It retains the convenience of use as a passive capacitor and has the potential to either increased power density or lifetime depending on the applications. However, the equivalent capacitance of the existing active capacitor is infinite ideally and can not be controlled to a specified value, which is inapplicable to replace the passive capacitors in the applications with accurate value needed, and could result in higher current stress as well as power loss at the light load condition and slower charging/discharging speed as well as dynamic response during the load change. This paper proposes a novel capacitance control method, which is able to configure the active capacitor with a specified capacitance value. The functionality and accuracy of the proposed control method have been verified and the performance is benchmarked with the passive capacitor and the active capacitor with conventional control method.