Control Of Inner Power Flows Of An Electrical System

Abstract: The present disclosure relates to a method for controlling inner power flows of an AC electrical system comprising an AC power source, an electrical component, and a power converter having a primary side, wherein the primary side of the power converter is electrically coupled to the AC power source via the electrical component, wherein the power converter comprises a plurality of cells being electrically coupled in series to one another at a primary side of the plurality of cells, wherein each of the plurality of cells comprises an AC- to-DC converter having a first AC portion being electrically coupled to the primary side of the plurality of cells or an AC-to-AC converter having a first AC portion being electrically coupled to the primary side of the plurality of cells, the method comprising: obtaining at least one electrical parameter of the AC electrical system; generating a control signal for each of the plurality of cells based on the obtained at least one electrical parameter; and controlling the inner power flows of the AC electrical system by adjusting voltages of the primary side of the plurality of cells based on the generated control signal, such that a voltage difference between a voltage of the AC power source and a sum of the voltages of the primary side of the plurality of cells causes a controlled current flow through the electrical component, wherein adjusting the voltages of the primary side of the plurality of cells comprises adjusting a magnitude and a phase of the voltages of the primary side of the plurality of cells by controlling the first AC portion of the AC-to-DC converter based on the generated control signal or by controlling the first AC portion of the AC-to-AC converter based on the generated control signal, and wherein a sum of the magnitudes of the voltages of the primary side of the plurality of cells is greater than a magnitude value of the voltage of the AC power source.

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