Abstract. In the paper is presented an analytical method for the determination of the magnetisation curve of the asynchronous machine. Obtaining the analytical shape reduces errors and allows to simplify the use of the magnetization curve in numerical applications for the evaluation of the machine's performance in any operating mode.
Photovoltaic panels (PF), combined with lead-acid battery (AE), are increasingly used, to produce electricity. To work in maximum power points, between (PF) and (AE) is interposed a static converter (DC-DC), which is a harmonic pollution source. Within the paper there are calculated the power losses, due to current harmonics, of a photovoltaic system working at its maximum power. Photovoltaic system works at its maximum power, if in the electronic system there is permanently voltage control among solar battery terminals.
The paper approaches the possibility of power functioning of the Aeolian systems. Power Aeolian systems, due to high inertia moments and rapid variation in time of the wind speed cannot constantly function on the maximum power point. Therefore it must be considered the matter of determining the optimal functioning speed of the Aeolian device on the basis of evaluating the momentary wind speed in order to get maximum of electric power. The calculation is based upon an original mathematical model for the wind turbine TV and an experimental direct follow of the wind speed in time. Actually, it is presented the way of loading the generator according to the wind speed.etc.
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