Three-level active power filter compensation current control system based on ladrc

Abstract

An LADRC-based (linear active disturbance rejection control) compensating current control system of a three-level active power filer is characterized by comprising a voltage zero-crossing detection unit, a current detection signal conditioning circuit unit, an A / D (analog / digital) conversion circuit unit, a D / A (digital / analog) conversion circuit unit, a DSP (digital signal processing) unit, a storage unit, a gate driven pulse unit and a voltage reference circuit unit. An operating method of the system includes: collecting current; performing DA conversion; acquiring controlled quantity of compensating current though DSP; performing AD conversion. The system has the advantages of simplicity and practicality, high compensating precision, good real-time performance and high execution speed, and high compatibility.

Description

[0001] (1) Technical field: [0002] The invention relates to active power filter current control, belongs to the field of inverter current tracking control, and is an active power filter compensation current control based on LADRC (linear active disturbance rejection control, LADRC—linear active disturbance rejection controller) system. [0003] (two) background technology: [0004] In recent years, the use of non-linear loads has become more and more common, and harmonics, as one of the standards of power quality, have attracted more and more attention. The research and development and application of harmonic control methods are becoming more and more popular. Due to the consideration of compensation capacity and cost, passive filters are mainly used in industrial sites at present, but passive filters may cause series and parallel resonance of the power grid, causing power grid Safety is affected, and the method of comprehensive detection and overall compensation is adopted,...

AI Technical Summary

Problems solved by technology

The research and development and application of harmonic control methods are becoming more and more popular. Due to the consideration of compensation capacity and cost, passive filters are mainly used in industrial sites at present, but passive filters may cause series and parallel resonance of the power grid, causing power grid Safety is affected, and the method of comprehensive detection and overall compensation is adopted, and active filtering becomes the most effective means of harmonics

Since the active power filter compensation current is a rapidly changing sinusoidal quantity, it is required that the active power filter can quickly and accurately track the harmonic current compensation amount, and the traditional PI control can achieve better speed and accuracy. The reason is that traditional PI is difficult to solve the contradiction between overshoot and rapidity

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