Study of the Compensating Ability of Synchronous Motors in the Power Supply System of a Metallurgical Enterprise

The article considers and analyzes the use of the compensating ability of synchronous off-line motors operating with a low switching coefficient. The analysis of working synchronous motors showed that in most cases the automatic excitation control is not involved, i.e. motors operate with a constant excitation current close to the nominal, which causes additional losses in the stator and rotor windings. For synchronous motors with abruptly variable load, the main task of regulation is to ensure stable operation and reduce active power losses. In order to assess the thermal state of the engine, the root-mean-square losses in the stator and rotor windings were taken for the rolling cycle. The calculations were carried out for a specific engine of the roughing stand of a rolling mill based on V- curve characteristic, taking into account the real gage of rolled strips. The article convincingly substantiates the possibility of running an unloaded motor with the delivery of reactive power to the network.