System and method thereof used for carrying out playback on recorded non-periodic dynamic current waveform

Abstract

The invention relates to a system and method thereof used for carrying out playback on a recorded non-periodic dynamic current waveform. The system comprises 2 broadband current transformers, 3 adjustable gain circuits, an AD acquisition card, a DA output card, a broadband power amplifier module, a broad-band large current generator and an upper computer, wherein the broadband current transformers are used for converting a large current signal into a measurable voltage signal; the adjustable gain circuits are used for carrying out signal conditioning on an input signal; the AD acquisition card is used for collecting digital signals in the system and sending to the upper computer; the DA output card is used for outputting a simulation signal of a current in the system; the broadband power amplifier module is used for carrying out power amplification on waveform signals output by the adjustable gain circuits so that a capability of driving the broad-band large current generator is possessed; the broad-band large current generator is used for carrying out current increase on a current waveform with a driving capability output by the broadband power amplifier module; and the upper computer is used for receiving a recorded waveform and a feedback waveform output by the AD acquisition card and executing a control program in the system, and through executing a PID algorithm, an integral output error of the feedback waveform and the recorded waveform is less than a preset value.

Description

technical field [0001] The present invention relates to the field of electric power measurement, and more particularly, to a system and method for playing back recorded aperiodic dynamic current waveforms. Background technique [0002] A large number of load currents have high non-periodic and non-sinusoidal characteristics, such as the load current of a large forging steel plant, the load current of a large electric railway traction station, etc. When the main load of the forging steel plant is not running, the overall load current also has certain harmonic characteristics, while in the daily work of the factory area, the impact of the load current waveform is not regular, and the waveform frequency and amplitude have large fluctuations. Variety. The current waveform not only contains harmonics and dynamic signals, but also contains shock-type signals with large amplitude changes and fast-changing processes. For such signals, fast Fourier transform (FFT) harmonic analysis ...

AI Technical Summary

Problems solved by technology

[0004] In order to solve the technical problem of being unable to replay the field current existing in the background technology, the present invention provides a system for replaying the recorded aperiodic dynamic current waveform, the system includes:

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