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NTT Facilities has studied a degradation prediction technology for Valve-Regulated Lead-Acid Batteries which makes use of data obtained from a lead storage battery management system. This paper reports functions and effectiveness of the degradation prediction technology.
An accurate circuit and device model is a valuable tool for developing new topologies, building successful designs, and shortening time to market. The input, output, and reverse transfer capacitance of power MOSFET are of vital importance to the MOSFET as they determine the dynamic behavior of the device during switching transients. In this study, the static characteristics of a specific GaN device...
This study evaluated power generation characteristics of sixteen different types of Photovoltaic (PV) systems in “F Solar Research Park”. As a result, the performance ratio of crystalline silicon and CIS PV systems were higher during winter months and decreased in summer whereas amorphous PV systems were reverse seasonal characteristics due to the light induced degradation and annealing effect. This...
The output voltage characteristics of a thermoelectric generator were analyzed to suppress heat leakage for low-temperature waste-heat thermoelectric generation. The experimental results show that the pre-cooled thermoelectric device output a higher voltage than the reference device. The experimental results also show that the influence of heat leakage took a longer time to appear using the pre-cooled...
A small modular unit for a power converter system with long lifetime DC-link capacitors is proposed. To reduce the ripple current stress of DC-link capacitors and to improve their lifetime by limiting temperature rises, low phase-to-phase-impedance busbars are selected. Consequently, in a power converter system whose size is 101 L, operating at a rated power of 100 kVA, DC-link capacitors achieve...
A battery management system (BMS) is a system that manages a rechargeable battery (cell or battery pack), by protecting the battery to operate beyond its safe limits and monitoring its state of charge (SoC) & state of health (SoH). BMS has been the essential integral part of hybrid electrical vehicles (HEVs) & electrical vehicles (EVs). BMS provides safety to the system and user with run time...
In recent years a growing attention is being paid towards energy efficiency in civil and industrial applications. In order to achieve better efficiency and enhance the energy management strategies, better knowledge is needed on the characterization of energy consumers. Categorization of electrical consumers through clustering procedures has been widely addressed in the literature. However, the categorization...
Cylindrical large formatted lithium-ion-battery “CH75” cells, battery pack “CH75-6” for stationary use, energy storage systems utilizing the CH75-6 to be applied to industrial applications and these characteristic points are described. In particular, energy storage systems for frequency-regulation applications and the cooling design of the battery panel are described.
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