Virtual impedance comprehensive control method for power inductive filtering system

Abstract

The invention discloses a power inductive filtering system and a virtual impedance comprehensive control method therefor. The power inductive filtering system mainly comprises a novel inductive filtering transformer subjected to special design and a filtering branch connected with the novel inductive filtering transformer, wherein the filtering branch comprises a single tuned filter set and harmonic current controlled voltage source inverters connected in series. According to the power inductive filtering system and the virtual impedance comprehensive control method, power grid resonance damping control of the voltage source inverters is organically combined with zero impedance control of filters according to unsolved technical problems in an existing filtering method and existing device manufacturing process difficulties, so that the problem of performance reduction of a passive filtering device caused by impedance parameter change of a power grid system is solved on one hand and the optimization control of a quality factor of the passive filtering device can be realized for reducing the dependence on the level of a device production process on the other hand; and quality factors of the single tuned filters are enabled to meet design requirements, so that the overall filtering characteristics are further improved.

Description

technical field [0001] The invention relates to the field of harmonic control of industrial rectification systems, in particular to a method for comprehensive control of virtual impedance of a power induction filter system that combines grid-side resonance damping control with quality factor control of a passive filter device. Background technique [0002] For power supply systems of high energy-consuming enterprises such as chemical industry and metallurgy, in order to improve operating efficiency and save investment costs, thyristor phase-controlled rectification systems are generally used. Due to the inherent nonlinear characteristics of such power electronic devices, it will inevitably lead to power quality problems such as large primary-side current distortion rate, excessive harmonic current injected into the grid side, and low power factor. [0003] At present, in solving the power quality problems of industrial rectification systems, the main measures taken are passi...

AI Technical Summary

Problems solved by technology

At the same time, the new induction filter transformer can also solve the problems of loss and noise caused by the harmonic current generated by the industrial rectifier load itself.

Images