A Virtual Impedance Synthetic Control Method for Power Induction Filtering System

Abstract

The invention discloses a power induction filter system and a virtual impedance comprehensive control method thereof. The power induction filter system in the invention mainly includes a specially designed induction filter transformer and a filter branch connected thereto; the filter branch includes Single tuned filter bank and series connected harmonic current controlled voltage source inverter. Based on the unsolved technical problems in the existing filtering methods and the existing difficulties in the equipment manufacturing process, the present invention organically combines the grid resonance damping control of the voltage source type inverter and the zero-impedance control of the filter. On the one hand, it solves the problems caused by the grid. The problem of performance degradation of passive filter equipment caused by changes in system impedance parameters. On the other hand, optimal control of the quality factor of passive filter equipment can be achieved to reduce dependence on the equipment production process level, so that the quality factor of the single-tuned filter meets the design time requirements, thus further improving the overall filtering characteristics.

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 induction filter transformer can also solve the problems of loss and noise caused by the harmonic current generated by the industrial rectifier load.

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