INVESTIGATION OF THE MODE OF A THREE-PHASE ACTIVE POWER FILTER IN THE POWER CIRCUIT OF AN ARC FURNACE AT OSCILLATIONS OF ACTIVE POWER
Arc furnace is a common smelting furnace for metallurgical production. At the same time, there is a stochastic operating mode in the arc furnace, that widespread in the industry. The combustion arc in the arc furnace is accompanied by a generation to the power supply network of reactive power, higher harmonics and there is asymmetry of currents. This leads to fluctuations not only in reactive power, but also causes fluctuations in active power. Static compensating devices such as condenser batteries, power passive filters, synchronous compensators do not have time to react to the sharply variable operating mode of the arc furnace. The latest advances in the compensation of inactive components power are the use of threephase active power filters, which do not have the phenomenon of resonance of voltages and currents, as well as they react to change the load during their work. In the work the model of the three-phase active power filter with an arc furnace to the visual modeling environment is synthesized. The parameters of the arc furnace substitution scheme are brought to the low side of the electric transformer the furnace. Parameters of three-phase active power filter are calculated for this type of arc furnace. In the course of the study, obtained the data of the consumption of active and reactive power of the load and the network, as well as the coefficient of distortion of the sinusoidality of the current load curve and the network. The received oscillogram of network voltage, load current, current active power filter, network current and spectral diagram of higher harmonics of load current and network. All the results obtained were analyzed and perform conclusions for them.