Medium-voltage distributed reactive power optimization system and method

Abstract

The invention discloses a medium-voltage distributed reactive power optimization system and method. The system comprises a head-end collection control unit, a plurality of reactive power compensation units and a background master station, wherein the head-end collection control unit is arranged at the position of the head end of a feeder; the reactive power compensation units are arranged in feeder branches; the collection control unit and the reactive power compensation units are in wireless communication connection; the head-end collection control unit and the background master station are in wireless communication connection; the reactive power compensation units and the background master station are in wireless communication connection; voltage and current signals of the head end of the feeder and the feeder branches and calculated real-time data result are imported back to the background master station; and the background master station controls switching of the reactive power compensation units according to reactive power flow analysis, formed topological structure map of a distribution network feeder and the load distribution condition, so that voltages at the head end and the tail end of a feeder line are balanced; the voltage quality of the feeder branches is improved; and the power factor is improved.

Description

technical field [0001] The invention relates to a device for adjusting, eliminating or compensating reactive power in a network, in particular to a medium-voltage distributed reactive power optimization system and method. Background technique [0002] In rural power distribution lines, due to the lack of reactive power compensation, the line loss is large and the voltage quality is poor. Usually, this situation needs to be changed. The measure taken is to install reactive power compensation devices on the distribution lines. By installing a reactive power compensation device, reactive power compensation can be effectively performed on the line, thereby achieving the purpose of energy saving and loss reduction. However, in the actual installation and application of this technology, the installation point is usually selected on the outgoing line side of the power transmission end, and this point in the line cannot reflect the overall load situation of the grid line at all, whi...

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Problems solved by technology

However, in the actual installation and application of this technology, the installation point is usually selected on the outgoing line side of the power transmission end, and this point in the line cannot reflect the overall load situation of the grid line at all, which causes the reactive power compensation device to improve the output voltage. When , the effect of improving the voltage at the end of the feeder line is not good

At the same time, the installation point cannot correctly reflect the reactive power demand of the entire feeder, and cannot correctly provide the judgment conditions for switching capacitors. When the reactive component of the load at the rear end of the installation point is smaller than the capacity of the compensation capacitor, the reactive power flow will flow to the power supply end , at this time, the controller in the reactive power compensation device will misjudge it as "overcompensation" and quit the operation of the compensation capacitor; Frequent switching of the device, easy to produce switching oscillation

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