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To solve the issues of the open-loop control accuracy in a proton exchange membrane (PEM) fuel cell power conditioning system (PCS) with active clamp push-pull DC/DC converter for input current ripple reduction, a novel closed-loop digital-controlled method is proposed. The proposed PEM fuel cell PCS consists of a high-efficiency high-step-up current-fed resonant push-pull DC/DC converter and a half-bridge...
To guarantee the reliable operation of 24 hours, improve the performance and durability of a proton exchange membrane fuel cell (PEMFC) stack, and prevent it from sudden failure in an uninterruptible power system (UPS) with hybrid backup redundancy PEMFCs, battery and supercapacitor (SC) power sources, this paper conducts research in smart power management and control strategy of two PEMFCs and UPS...
This paper investigates practical cost-effective DC/DC converter, DC/AC inverter and AC/DC rectifier for an uninterruptible power supply (UPS) system with backup proton exchange membrane fuel cell (PEMFC). The developed power converters can supply high quality power with flexible conversion functions, leading to the establishment of reliable power management for UPS applications. A comprehensive control...
This paper presents the expert fault monitoring and intelligent comprehensive control of a proton exchange membrane (PEM) fuel cell (PEMFC) as backup power source for an uninterruptible power supply (UPS) system. The failure status can be shown on the screen of a micro-computer (or a PC) linked with the UPS through an RS-232 and on the control panel of the UPS through LED indicator lights. The proposed...
This paper studies the practical cost-effective DC/DC converter, DC/AC inverter and AC/DC rectifier for an uninterruptible power supply (UPS) system with backup proton exchange membrane fuel cell (PEMFC). Furthermore, a comprehensive controller for the PEMFC is designed according to the change of the load, while the energy storage elements, such as battery and ultracapacitor, are chosen in order to...
This paper presents the design and analysis of comprehensive control system of a fuel cell which is directly connected to a DC motor. The fuel cell system consists of a 63-cell 300 W proton exchange membrane fuel cell (PEMFC), a 3-cell lead-acid battery and a conventional DC machine. The comprehensive controller design and analysis of the fuel cell are presented, including the design of the PEMFC...
To analyze and improve the performance of proton exchange membrane fuel cell (PEMFC) stack, this paper conducts research in intelligent comprehensive control of the operational parameters, such as the operating temperature, pressure, mass flows of hydrogen and air for the PEMFC stack, current density, the exhaust emission quantity of reactant gas, and humidity of the hydrogen and air/oxygen. A detailed...
This paper presents the performance analysis of proton exchange membrane fuel cells (PEMFCs) and evaluation of the fuel cells by using a current density extent (D) and a steady-state error rate (S) as the steady-state performance indexes based on the effects and sensitivity of the fuel cell parameters on the polarization curve. Excluding the non-linear parts of the curve, which are the activation...
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