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In this paper, control and design method of the fuel-cell (FC) stack diagnostic bi-directional converter are proposed. FC stack diagnostic converter is applied the bi-directional DC/DC converter for controlling the AC current. The AC current control is performed by applying the d-q transform for accurate current control. As a result, it can diagnose the status of the FC stack by supplying the AC current...
This paper proposes a new control method for a current-fed isolated bi-directional dual half-bridge DC/DC converter using a resonant switch (CF-IDHCR) to improve efficiency. CF-IDHCR is based on a current-fed half bridge converter, and the diodes bridge are replaced with MOSFETs to provide bi-directional operation. The resonant components in CF-IDHCR are used to increase the efficiency by achieving...
A current sharing method considering battery state of charge(SOC) for multi-module uninterruptable power supply(UPS) system is proposed. Modularized UPS system consists of a single master module and multi slave modules. A master module performs output voltage control and distributes current commands to slave modules. The current commands are generated by using the proposed current sharing algorithm...
This paper presents the predictive control of single-phase UPS system for fast dynamic characteristic. When occurring grid fault, UPS system has to transfer UPS mode and supply power to the load. In PI controller, it has a disadvantage rather low dynamic characteristic, which is caused increasing transient time. To solve this problem, the predictive control is proposed. By adopting predictive control...
A DC-link voltage compensation method for a photovoltaic (PV) generation system with energy storage system(ESS) is presented. When PV power is oscillated, the DC-link voltage is also influenced. And this fluctuation of DC-link critically affects the load voltage when the ESS is operated in stand alone mode. In conventional method, huge capacitor bank is necessary to reduce the fluctuation. In this...
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