Single tripolar synchronous switch-based intelligent reactive power compensation device

Abstract

The invention discloses a single tripolar synchronous switch-based intelligent reactive power compensation device, which is characterized in that: the input ends of main contacts of a tripolar synchronous switch K1 are connected with three phases of power grid voltages U, V and W respectively, and the output ends of the main contacts of the tripolar synchronous switch K1 are connected with a capacitor bank respectively; a pre-charging circuit 1 is connected in parallel between the input end and output end of a main contact; a pre-charging circuit 2 is connected in parallel between the input end and output end of another main contact; the line voltage of a power grid pre-charges the capacitor group through the pre-charging circuits 1 and 2; a phase control device switches on and switches off the three main contacts of the tripolar synchronous switch K1 at the same time according to the preset phase angle of the voltage of the power grid to switch the capacitor group. Experimental waves show that the device is good in switching electrical effect, environment-friendly, energy-saving, simple in structure, economical and practical, and can be conveniently applied to engineering in a large scale.

Description

technical field [0001] The invention relates to the fields of reactive power compensation, harmonic filtering and grid power quality control of electric power systems, and in particular to an intelligent reactive power compensation device based on a single three-pole synchronous switch. Background technique [0002] The power grid needs reactive power compensation to achieve the purpose of stabilizing the grid voltage, improving the power factor, and reducing line loss. Switching capacitor bank is the main method to realize reactive power compensation. However, the technical status of switching capacitor bank is not optimistic. [0003] In the field of reactive power compensation, about 80% use mechanical contact switches to switch capacitors. The mechanical contact switches are three-pole switches. The three main contacts of the three-pole switch are closed and opened at the same time. The voltage phase angle switches the capacitor, and the current when it is switched in e...

AI Technical Summary

Problems solved by technology

The structure of three unipolar synchronous switches is more complicated than that of a single three-pole synchronous switch, and there are more driving circuits, and each unipolar switch requires an independent switch coil and driving circuit, and the driving sequence is complicated

Due to the difficulty of TSC technology, high energy consumption and high cost, it is only used in the low-voltage field, and there are not many applications in the medium-voltage field.

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