Electric-dazzling prevention device and method of bidirectional zero-clearance conversion current based on self-adaption

Abstract

The invention provides an electric-dazzling prevention device and an electric-dazzling prevention method of bidirectional zero-clearance conversion current based on self-adaption. The electric-dazzling prevention device comprises a mains power voltage amplitude detection sampling circuit, a 220V power grid voltage current phase sampling circuit, a rectification module, a direct-current voltage reduction module circuit, a singlechip main control unit, a power supply module, a high-frequency transformer output circuit, a driving circuit, a bidirectional triode thyristor zero-clearance conversion current switching main circuit and a load voltage current detection circuit. According to the electric-dazzling prevention device, an alternative-current sampling technique is adopted to sample a power grid sinusoidal voltage amplitude value and a voltage current phase position, negative phase voltage is converted into positive phase voltage, and the amplitude value is correspondingly reduced to be a range that a singlechip main control unit can endure. Due to the adoption of the bidirectional triode thyristor zero-clearance conversion current structure based on self-adaption, the situation of current cutoff is well avoided in a smooth follow current mode, and the switching reliability is improved. As a bypass type structure is adopted to access a relay to the circuit, fault points are reduced, moreover, the service life of a triode thyristor is prolonged.

Description

technical field [0001] The invention belongs to the technical field of power grid sway protection, and in particular relates to an anti-sway device and method based on self-adaptive bidirectional gapless commutation. Background technique [0002] It is very important to ensure that the contactor does not trip and prevent swaying electricity in the operation of the whole factory. A good anti-swaying device can not only ensure the reliability and stability of load operation, but also improve the economy of power system operation. [0003] The improvement of anti-sway electricity technology should start from two aspects, one is the judgment of sway electricity, and the other is the hardware circuit structure. At present, most of the sway electricity judgment algorithms are based on the sine function model. If there is a small amount of distortion or offset in the measured waveform, it will lead to measurement errors. At the same time, the algorithm solution process is complicat...

AI Technical Summary

Problems solved by technology

At present, most of the sway electricity judgment algorithms are based on the sine function model. If there is a small amount of distortion or offset in the measured waveform, it will lead to measurement errors. At the same time, the algorithm solution process is complicated, and the control chip operation process takes a long time. There is no reliable theoretical basis for setting the threshold, and it depends heavily on the experience of the debugger. It may happen that the same system works well locally, but there are many misoperations in other places.

For the hardware circuit structure, most of the anti-sway devices with relay structure are popular in the market now, but this type of anti-sway device will have a cut-off situation during the switching process, which will cause the contactor to trip.

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