The problems of reactive power compensation in low-voltage network of an industrial plant provided with asymmetric receivers

The paper presents analysis of reactive power compensation in low-voltage network of an industrial plant of high asymmetry of the RL-type loads, with the use of MADCAT computer software. For compensation of reactive power in the network the capacitors and synchronous machines are used, that are endangered to consequences of high voltage asymmetry. The loads are characterized by impedance variations in particular phases, variable R/L ratio and C capacity. The paper considers important problem of determining allowable asymmetry of RL load with regard to the degree of asymmetry of the winding currents of the synchronous machine and the capacitor, and particularly the ratio of the negative sequence voltage of the synchronous machine armature to its rated voltage.