Controlled balancing device with inductive energy storage

The paper covers the problem of voltage unbalance in supply networks. The authors give overview of existing ways to remove current unbalance and observe benefits and drawbacks of these ways. The paper proposes usage of a balancing device with inductive energy storage based on controlled energy exchange between network and reactor by means of three-phase bridge converter. The paper also presents diagrams of the balancing device, power unit with IGBT valves and control unit, and describes their functioning.Study of the balancing device was conducted with the use of computer model created with Matlab/Simulink program. The paper presents general arrangement of the balancing device computer model, description of itsunits and several chains of their interaction.The authors observe open-phase operating mode of the balancing device and give oscillograms of mains voltage and currents at using of balancing device.Matlab/Simulink-generated controlling system with three-phase bridge composed of transistor modules and reactor allows of reducing unbalance of currents and thus of eliminating unbalance of supplying network voltage, that is proven by the oscillograms in given the paper.