Voltage tracking retainer on the basis of single-phase inversion

Abstract

The present invention provides a voltage tracking retainer on the basis of single-phase inversion. The voltage tracking retainer on the basis of single-phase inversion comprises a sampling and control module, a power supply module and an inversion module. The sampling and control module includes a mains voltage amplitude detection sampling circuit, 220V network voltage and current phase sampling circuit, a load voltage and current detection circuit and a single chip microcomputer main control unit. The power supply module includes a rectification module, a direct current reduction voltage module, a power supply bidirectional selection controller, an intelligent charge and discharge circuit, a high frequency PWM generation circuit and a transformer push-pull output circuit. The inversion module includes a driving circuit and an inverter switching main circuit. The voltage tracking retainer on the basis of single-phase inversion is able to realize the sampling of power grid sinusoidal voltage amplitudes and the sampling of voltage and current phases through adoption of the alternating current sampling technology, and solve the voltage tracking accuracy problem through adoption of an improved double closed loop control algorithm. Through analysis of the voltage state, the voltage tracking retainer on the basis of single-phase inversion triggers a network voltage tracking retainer to invert and output the sinusoidal voltage, remains an alternating current contactor to continue actuation, overcomes the problem of poor quality of the short-time electric energy and ensures the continuous stabilization operation of a device.

Description

technical field [0001] The invention relates to a single-phase inverter-based voltage tracker and belongs to the technical field of grid voltage protection. 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. ±12 [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 structure of the power switching circuit. 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 proces...

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 power switching circuit structure, most of the popular anti-sway devices in the market are relay-structured anti-sway devices, but this type of anti-sway device will have a cut-off situation during the switching process, causing the contactor to trip.

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