Ripple Eliminator to Smooth DC-Bus Voltage and Reduce the Total Capacitance Required
Ripple Eliminator to Smooth DC-Bus Voltage and Reduce the Total Capacitance Required
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DOI：
10.1109/tie.2014.2353016
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发表时间：
2015-04-01
影响因子：
7.7
通讯作者：
Ming, Wen-Long
中科院分区：
文献类型：
--
作者：
Cao, Xin;Zhong, Qing-Chang;Ming, Wen-Long
直流系统中经常需要大容量电解电容器来滤除电压纹波，这会大大降低功率密度和系统可靠性。在本文中，涟漪消除器，这是一个双向升降压变换器终止与辅助电容，以取代笨重的电容器在直流系统。端子上的电压纹波（即，DC总线）可以被转移到辅助电容器，并且辅助电容器上的纹波可以在宽范围内变化。此外，辅助电容器的平均电压可以被控制为低于或高于直流总线电压，这为涟漪消除器提供了宽的工作范围，并且还提供了进一步减小辅助电容的可能性。因此，所需的总电容可以比最初所需的小得多。在提出了一种将电压纹波转移到辅助电容的控制策略之后，提出了三种控制策略来调节辅助电容电压以保持正常操作。密集的实验结果来证明的性能。
Bulky electrolytic capacitors, which are often needed in dc systems to filter out voltage ripples, considerably reduce power density and system reliability. In this paper, a ripple eliminator, which is a bidirectional buck-boost converter terminated with an auxiliary capacitor, is adopted to replace bulky capacitors in dc systems. The voltage ripples on the terminals (i.e., the dc bus) can be transferred to the auxiliary capacitor, and the ripples on the auxiliary capacitor can vary in a wide range. Moreover, the average voltage of the auxiliary capacitor can be controlled either lower or higher than the dc-bus voltage, which offers a wide operational range for the ripple eliminator and also the possibility of further reducing the auxiliary capacitance. Hence, the total capacitance required can be much smaller than the originally needed. After proposing a control strategy to transfer the voltage ripples to the auxiliary capacitor, three control strategies are proposed to regulate the auxiliary-capacitor voltage to maintain proper operation. Intensive experimental results are presented to demonstrate the performance.