Bidirectional Buck-boost DC-DC Converter Research Articles

Research on the Bi-directional DC-DC Conversion Characterization of Ultra -capacitor Energy Storage System

To ensure the stability of load voltage, a bi-directional DC-DC converter is usually required in the power buffer application of the ultra-capacitor energy storage system. In this paper, non-isolated Buck-Boost bi-directional DC-DC converter is analyzed to improve the terminal voltage performances. In the light of the requirements of constant terminal voltage when positive and negative bi-directional power flows, the optimal design of power circuit and control parameters increases the operation stability of the whole ultra-capacitor energy storage system. Furthermore, it decreases the fluctuation of load voltage and raises the utilization rate of ultra-capacitors’ energy reserve.

A Novel Bidirectional DC-DC Converter with Robust Control Scheme for Flywheel Energy Storage System

This study presents a novel bidirectional dc-dc buck-boost converter compatible with the flywheel energy storage system (FESS) and a robust control for bidirectional power flow, according to the single cycle average current control scheme and proportional-integral (PI) control theory. The proposed converter and its control are designed to adjust voltage to achieve current limiting start up and final speed keeping of the motor in charge mode and maintain a constant output voltage in the case that terminal voltage of the motor in the FESS drops continually in discharge mode. Simulation results demonstrate high performance of the converter in both steady-state and dynamic operations.

05/00129 Analytical service of fuel cell: Fujiwara, Y. et al. Densi Zairyo, 2004, 42, (2), 81–84

This chapter discusses the interfacing circuits needed for an energy storage system (ESS) to connect to the microgrid. In the first part, the structures and basic principles of several power converters are discussed. They include DC-DC converters, AC-DC rectifiers, DC-AC inverters, AC-AC converters. The most important DC-DC converter for an ESS is the bidirectional buck-boost DC-DC converter, which can help the ESS to be charged and discharged. For DC-AC converters, the voltage source inverter (VSI) is the most used converter in practice. A VSI can be used to integrate an ESS or solar photovoltaic into the microgrid. The following section introduces battery management systems (BMS). The different configurations of BMS are given. Within a BMS, cell balancing is important for reliable operation of the battery energy storage systems (ESS). Thus, two different cell-balancing functions of BMS are presented, namely active cell balancing and passive cell balancing. Two case studies are presented in the last section. The first case is about the control of bidirectional DC-DC converter; the second case is the dq control of VSI. The results show that real power and reactive power are controlled independently.