Three-phase unbalance and reactive power control device and method of interphase capacitor

Abstract

The invention discloses a three-phase unbalance and reactive power control device and method of an interphase capacitor. The three-phase unbalance and reactive power control device of the interphase capacitor comprises a master controller, a current acquisition device, a voltage acquisition device and a fine reactive compensation unit, wherein the current acquisition device and the voltage acquisition device are connected with an input end of the master controller, and the fine reactive compensation unit is connected with an output end of the master controller and comprises an interphase compensation circuit and a phase-zero compensation circuit. The interphase compensation circuit and the phase-zero compensation circuit adopt capacitors to compensate, the unbalance phenomenon of a three-phase power grid can be effectively controlled; with the utilization of capacitor adjustment branches, the inductive reactive power in three-phase electricity can be effectively offset; and moreover, a plurality of capacitor adjustment branches are connected to the three-phase electricity and between the three-phase electricity and a zero line, the adjustment is more fine, and the over-compensation also can be prevented.

Description

Technical field [0001] The present invention relates to the field of three-phase unbalance treatment, in particular to a device and method for three-phase unbalance and reactive power treatment of interphase capacitance. Background technique [0002] With the advancement of society and the development of technology, a large number of power electronic devices have been put into use in the power grid. Although these devices have brought users technical advantages and economic benefits, they have caused serious pollution to the power grid and seriously threatened others. Safe operation of electrical equipment. The pollution caused by these power electronic equipment is mainly divided into the following categories. [0003] Reactive power: Power electronic equipment will absorb a large amount of reactive power from the grid during use, and due to the use of digital control technology, the control accuracy and response time are improved, and the reactive power fluctuates sharply. A la...

AI Technical Summary

Problems solved by technology

A large amount of reactive power will reduce the system voltage, increase the loss of transformers, reduce the utilization rate of equipment, and violently fluctuating reactive power will cause voltage flicker

[0004] Three-phase unbalance: The three-phase unbalance problem will cause additional heating of the rotating motor, resulting in misoperation of various protection devices with negative sequence components as the starting component, and shortening the life of electrical equipment; low equipment load rate will cause Waste of equipment capacity resources

However, for a long time, the low-voltage system has almost no effective means to make reasonable adjustments except to distribute the load as reasonably as possible.

[0005] Three-phase unbalance has always been one of the main problems plaguing power supply units, resulting in a substantial increase in transformer loss and line loss, causing greater adverse effects on the operation of the low-voltage power grid and electrical equipment

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