Reactive compensation device

Abstract

The invention discloses a reactive compensation device which is connected with a mains supply and a load. The reactive compensation device comprises a comprehensive controller, a chopping control module and a capacitor bank control circuit, the chopping control module and the capacitor bank control circuit are respectively connected with the comprehensive controller, the capacitor bank control circuit comprises a multiple-pole switch and a plurality of series branches, the multiple-pole switch is connected with the mains supply, the series branches are in series connection with the multiple-pole switch, each series branch comprises a protecting resistor bank, a power factor controller connecting contactor combination, a reactor group and a reactive compensating capacitor bank which are in sequential series connection, and the comprehensive controller is used for continuously adjusting voltage on compensating capacitors by controlling the chopping control module and power factor controllers, so that continuous capacitive reactive adjustment is achieved. The reactive compensation device has the advantages of avoidance of low-order harmonics, simplicity in control and easiness in implementation.

Description

technical field [0001] The invention relates to a reactive power compensation device. Background technique [0002] At present, most loads in the power system consume reactive power. If there is a large amount of reactive power flowing in the power supply line, it will cause a large amount of energy loss. Therefore, reactive power compensation is a necessary measure for energy saving and consumption reduction in power systems. At present, inductive loads account for the vast majority of reactive power loads, and the demand for reactive power of these loads is constantly changing. Therefore, the main task of reactive power compensation devices in practical applications It is to provide continuously adjustable capacitive reactive power. [0003] With the development of power electronics technology, static compensators (SVC) in the form of thyristor controlled reactors (TCR) and thyristor switched capacitors (TSC) have been widely used. It has the advantages of no mechanical ...

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Problems solved by technology

A document proposes a pulse width modulation (PWM) type SVC using a self-shutoff device, which adjusts the equivalent reactance of the reactor by controlling the duty cycle of the switch. Compared with the TCR, the harmonic generation is small and the response speed is fast, but It also needs to cooperate with FC and TSC to realize continuous adjustment of capacitive reactive power

And this continuous adjustment method of offsetting capacitive reactive power by continuously adjusting inductive reactive power reduces the utilization rate of compensation components and increases losses

Although the static var compensator STATCOM based on the voltage-type or current-type bridge converter structure proposed in recent years has relatively ideal compensation characteristics, the control of this compensator is much more complicated than the aforementioned SVC

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