METHOD FOR DETERMINING THE INTERNAL RESISTANCES OF THE SOURCE FOR TRANSMITTING THE MAXIMUM POWER FROM THE ACTIVE THREE-POLES NETWORK

Abstract

The article deals with DC as well as with AC linear three-pole networks a three-phase source of electric energy being of such kind. The problem of the maximum active power supply from the ac- tive three-pole network to the load is considered. The corresponding conditions for the maximum power sup- ply are found for both DC and AC cases: in DC case, the load branch resistances are to be equal to the re- sistances of the corresponding source branches; in AC case the load branch complex impedances are to be equal to the conjugate complex impedances of the corresponding source branches. In accordance with the results obtained, new experimental way to determine the inner impedance of a three-phase source is pro- posed. It is based on the active power measurement, the load resistance and reactance being set at the same time in order to attain the load maximum active power. When such condition is realized the load resistance and reactance values are checked and the inner impedance of the three-phase source is obtained. The rec- ommendations to do in case of little inner impedance are given. The procedure of the inner impedance de- termination is explained in detail. The results are verified with the aid of a computer modeling. It is possible to arrive at the same conclusion in case of a four-wire three-phase source (star-connection with neutral).