Bipolar modulation 360° power flow controller and its working method

Abstract

The invention discloses a bipolar modulation 360° power flow controller, which includes a three-phase input transformer module, a bipolar Buck AC unit circuit module and an output filter module; the bipolar Buck AC unit circuit module includes a phase voltage dual The polarity Buck AC unit circuit and the line voltage bipolar Buck AC unit circuit, the output terminal of the phase voltage bipolar Buck AC unit circuit and the output terminal of the line voltage bipolar Buck AC unit circuit are connected in series to the input of the output filter module Connect the phase voltage of the three-phase input transformer module and the line voltage with a phase difference of 90° to the phase voltage bipolar Buck AC unit circuit and the line voltage bipolar Buck AC unit circuit to realize the output voltage amplitude and phase 360° adjustment. The invention can realize the 360° adjustment of the output voltage amplitude and phase, and realize the separate or simultaneous adjustment of the active power flow and the reactive power flow, the control is more flexible, and the circuit structure is simplified at the same time.

Description

technical field [0001] The invention relates to the technical field of power electronic conversion, in particular to a bipolar modulation 360° power flow controller and a working method thereof. Background technique [0002] With the development of society, the scale of the power grid is expanding day by day, and the problem of uneven distribution of power transmission and transformation equipment flow is becoming more and more prominent, making it difficult to fully utilize the power supply capacity of the power grid. The power flow in the power system includes active power flow and reactive power flow, which are generally determined by the power supply, load and power supply network. Due to the restrictions of urban planning, the difficulty of line reconstruction and grid expansion is gradually increasing. Therefore, how to improve the power transmission capacity of the power grid, improve the power flow distribution, and enhance the stability of the power system on the ba...

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Problems solved by technology

[0006] For this reason, the technical problem to be solved by the present invention is to overcome the 360° adjustment of the output voltage phase of the power flow controller by adding an input selection switch or an output selection switch or increasing the number of single-phase Buck AC conversion circuits in the prior art, resulting in topological Relatively complicated defects in structure and control strategy

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