Reactive power compensation device for thyristor cyclically-switched capacitor

Abstract

The invention relates to a reactive power compensation device for a thyristor cyclically-switched capacitor. The cyclically-switched capacitor is realized based on a DSP+CPLD (digital signal processor + complex programmable logic device) digital controller, and the switching time is selected through positive thyristor valve pressure uT detected by a voltage sensor. The device comprises a reactive power controller and a voltage and current sensor connected with the reactive power controller. The reactive power compensation device has the advantages of reasonable design, simple structure, complete practicability, accurate control, strong anti-jamming capability, quick dynamic response, low cost, high reliability and low maintenance cost; and in addition, the reactive power impact effect for reducing the loads of a thyristor rectifying device or other large-scale motors is obvious, and the system power factor is improved from 0.4-0.7 before compensation to above 0.92.

Description

technical field [0001] The invention relates to a thyristor cycle switching capacitor reactive power compensation device. Background technique [0002] Large-scale electric drive mining excavators are the core mining equipment in large-scale mining fields. Their buckets have a volume of more than ten to dozens of cubic meters. The power source is electric power. The walking, lifting, turning and Pushing operation, the power supply capacity of the entire electric shovel reaches several megavolt amperes, and the maximum DC working current of a single transmission system reaches several thousand amperes. Due to the special load characteristics of lifting, pushing and other mechanisms and the transmission system uses a thyristor phase-controlled rectification system to operate , the power factor is often around 0.4 to 0.7. The low power factor will lead to increased equipment capacity, increased equipment and line losses, increased line voltage drop, severe voltage fluctuations,...

AI Technical Summary

Problems solved by technology

[0003] The present invention mainly solves the technical problems existing in the prior art, such as increased equipment capacity, increased equipment and line loss, increased line voltage drop, severe voltage fluctuation, and decreased power supply quality of the power grid due to low power factor; it provides a It is a reactive power compensation device for thyristor cycle switching capacitor (TSC) that reduces the reactive power impact generated by thyristor rectifier device or other large motor loads, improves system reliability and reduces maintenance costs.

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