Unbalanced reactive compensation intelligent capacitor and method

Abstract

The invention relates to the field of power and particularly to an unbalanced reactive compensation intelligent capacitor and method. The unbalanced reactive compensation intelligent capacitor comprises a main control MCU processing unit, a data collection unit, a zero-cross switching control unit and a capacitor assembly composed of a separate compensation capacitor and a phase compensation capacitor; the main control MCU processing unit calculates a grid-side sampling data based on voltage and current signals and a temperature signal, then carries out an unbalanced compensation scheme preferentially based on the grid-side sampling data, then carries out a reactive compensation scheme and realizes selection of a separate compensation capacitor group or a phase compensation capacitor group through the zero-cross switching control unit, thereby realizing unbalanced compensation scheduling or reactive compensation scheduling. The unbalanced reactive compensation intelligent capacitor has the beneficial effects that separate compensation and phase compensation of the separate compensation capacitor can be realized, the compensation forms such as the compensation of a common compensation capacitor or split compensation and phase compensation mixed compensation are controlled, both the unbalanced compensation and the reactive compensation are realized, and the utilization space of the intelligent capacitor is also improved.

Description

technical field [0001] The invention relates to the field of electric power, in particular to an unbalanced reactive power compensation intelligent capacitor and a method thereof. Background technique [0002] With the rapid rise and development of all walks of life in our country, people's living standards are getting higher and higher, the power distribution system is expanding and becoming more and more complex, and the impact and asymmetrical loads are increasing. These load systems will cause power distribution systems. Power quality problems such as low factor and large three-phase unbalance. When there is a large amount of reactive power flowing in the power supply system, and the three-phase unbalance exceeds a certain range, it will affect the safe operation of the system. [0003] In the actual medium and low voltage distribution network system, three-phase unbalance and reactive power often appear at the same time, but the existing reactive power compensation equ...

AI Technical Summary

Problems solved by technology

When there is a large amount of reactive power flowing in the power supply system, and the three-phase unbalance exceeds a certain range, it will affect the safe operation of the system

[0003] In the actual medium and low voltage distribution network system, three-phase unbalance and reactive power often appear at the same time, but the existing reactive power compensation equipment, such as sub-compensation capacitors, common compensation capacitors, etc., realize the reactive power compensation function, but How to improve and compensate the three-phase unbalance is not considered. If the switching is improper, it will increase the unbalance

Three-phase unbalance compensation devices, such as zero line current compensation method, active power transfer switch, etc., cannot realize reactive power compensation

Some dynamic compensation devices, such as SVG, APF, etc., can compensate reactive power and three-phase unbalance at the same time, but the equipment is huge, the cost is expensive, or there are problems such as complex wiring and installation on site.

[0004] Traditional capacitors can only achieve reactive power compensation or unbalance compensation alone, or a combination of multiple compensation capacitors, common compensation capacitors and phase compensation capacitors for compensation, and what is more, it needs to be controlled by controllers, composite switches and other control equipment, but There are problems such as complex on-site installation, large volume, and high operating costs

Images