Power management of PEM fuel cells system for mobile power unit

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F60461373%3A22310%2F18%3A43916120" target="_blank" >RIV/60461373:22310/18:43916120 - isvavai.cz</a>

Alternative codes found

RIV/60461373:22310/18:43916122

Result on the web

—

DOI - Digital Object Identifier

—

Result language

angličtina

Original language name

Power management of PEM fuel cells system for mobile power unit

Original language description

Modern rescue and military units require for their efficient work numerous electronic devices. Their number is rapidly growing in time. For all of them cut-off of the energy supply, or providing mobile, long-lasting and reliable energy supply for outdoor activities, represents an important issue. Typical long-time consumption of police/fire brigade mobile base with necessary equipment comprises 100-200 W of base load and up to 700 W of peak consumption. PEM fuel cell stack based mobile APU represents promising solution of this problem. Its main advantages are high flexibility and efficiency, high process intensity, instantaneous refuelling and absence of moving parts, the last aspect being a reason of fuel cell silent operation. This fact is very important especially for medicine and military applications. Products of reactions taking place in the PEM fuel cells are electric energy, heat and water exclusively. This fact allows application of this technology also in areas sensitive to exhalations. All above-mentioned devices represent dynamic loads. It is in contradiction to the preferable PEM fuel cell operation regime. This is reason, why power management is necessary. This problem can be accomplished by utilizing correspondingly sized accumulators connected to the fuel cell stack. Different types of batteries, however, suffer from different problems (sensitivity to the temperature, low charging/discharging problem, high weight, etc.). Additionally, the PEM fuel cells stack has to be in regular time intervals short circuited for couple of milliseconds. It helps to remove from its electrodes undesired components. These short-lasting shortcuts can be problematic for connected devices and represent a problem for balancers in a standard acu-packs. Promising solutions and an alternative option represents utilization of supercapacitors. It is because they are able to switch fast between charging and discharging mode and to operate under high current load in a broad area of temperatures. Their main disadvantages consist in lower energy/weight ratio and higher spontaneous discharging current when compared to accumulators. Target of this work is to propose different configurations and parameters of APU power management individual components. They have subsequently been tested with respect to minimizing variation in APU voltage with changing load. Selection of power management components was limited due to the requirement of limited weight of the system. In this study the best ratio between desired stability and weight of the APU were determined for system consisting of PEM fuel cell, supercapacitor with small capacitance and accumulator able to work with high currents.

Czech name

—

Czech description

—

Type

O - Miscellaneous

CEP classification

—

OECD FORD branch

10405 - Electrochemistry (dry cells, batteries, fuel cells, corrosion metals, electrolysis)

Project

<a href="/en/project/VI20152019018" target="_blank" >VI20152019018: Development and realization of autonomous DC power supply with hydrogen fuel cell</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2018

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů