Dynamic comprehension device of split-phase reactive power

Abstract

The invention discloses a dynamic comprehension device of split-phase reactive power, comprising a dynamic controller. The dynamic comprehension device is characterized in that the dynamic controller is respectively connected with a current-sampling unit, a voltage-sampling unit, a dynamic comprehension unit and a temperature collection and control unit, wherein the current-sampling unit, the voltage-sampling unit and the dynamic comprehension unit are connected with a three-phase circuit; the dynamic comprehension unit comprises a plurality of capacitor-switching circuits and connected comprehension capacitors; and thyristor switches are connected between the dynamic comprehension unit and the three-phase circuit and controlled by an external thyristor-switching circuit. The three-phase lines of the dynamic comprehension device of split-phase reactive power are respectively used for current and voltage sampling and mixed comprehension to greatly improve the comprehension effect and avoid the defects of over-comprehension, undercompensation, and the like caused by three-phase shared comprehension.

Description

technical field [0001] The invention belongs to the field of line reactive power compensation, in particular to a phase-splitting reactive power dynamic compensation device. Background technique [0002] The rapid development of the national economy and the continuous improvement of people's living standards have brought about a rapid increase in power load, but the installed capacity of power generation and transmission capacity are far from meeting the demand for electric energy. At the same time, with the opening of the power market, power users' requirements for power quality are also increasing. [0003] The economy and power quality of power system operation have a great relationship with reactive power. Reactive power is an indispensable power in the power system. A large number of inductive loads and reactive power loss in the grid require the system to provide sufficient reactive power, otherwise the grid voltage will drop and the voltage quality will not be guara...

AI Technical Summary

Problems solved by technology

The electric load changes instantaneously, and the reactive power it needs also changes at any time. In order to maintain the reactive power balance, the capacitor must be switched in time according to the change of the reactive load. The traditional low-voltage dynamic reactive power compensation equipment uses a mechanical switch as the capacitor. Switching switches, mechanical switches are not only slow in action, but also produce inrush impact, overvoltage, arc reignition, etc. The switch itself and the power capacitor are easily damaged

According to statistics, the damage rate of the automatic switching capacitor reactive power compensation device used in the past is 75% after 3 years, and the damage rate is extremely high.

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