Optimization of mode of unballanced three-phase power supply by active filter using advanced algorithms
Kate Yagup · Bulletin of the National Technical University «KhPI» Series New solutions in modern technologies · 2016
The optimization of operating modes of three-phase power supply network with unbalance active-inductive load is considered. Increase of line currents amplitudes and emergence of reactive power take place in such mode. These cases cause as losses in power line, as harm for its consumers. Therefore the problem, which is under consider, is actual. The resulting asymmetry of this line currents and reactive power are compensated with using a parallel active filter, which is a bridge inverter on the IGBT-transistors. Control of inverter keys is carried out by the control system with the implementation of the pulse-width modulation on hysteretic principle. A result of comparison of line current and signal from the reference current source is supplied on hysteresis element. Whereby pulses of various widths are formed, which control inverter switches so as to form an acceptable mode of operation of the network. The corresponding visual model and the optimization algorithm of the flexible polyhedron are used to optimize the system mode. The optimization is carried out by stabilization of the voltage reservoir capacitor, and optimization parameters are the amplitude of signal of reference current source and the initial capacitor voltage. The stabilization of capacitor voltage is realized by means of mathematical operations with the values of the capacitor voltage measured at the end of each oscillation period. As a result of search optimization take place complete balancing of the network currents, their amplitude decreased in four times, the reactive power has been reduced to zero, and the optimal initial voltage of the capacitor has reduced the transient current amplitude and in its mode