Sliding mode control method of novel three-phase three-wire system active filter

A three-phase three-wire, source filter technology, used in harmonic reduction devices and AC networks to reduce harmonics/ripples, etc. The problem of large wave current tracking error, etc., can reduce the chattering phenomenon, reduce the harmonic content of the power supply, and reduce the tracking error.

Inactive Publication Date: 2012-02-15
HOHAI UNIV CHANGZHOU
View PDF2 Cites 12 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Although the traditional hysteresis comparison method has the advantages of fast dynamic response, good robustness, and strong adaptability to loads, etc., the power supply current chattering phenomenon is serious, the tracking error of harmonic current is relatively large, and the harmonic content of power supply current is relatively high. , which greatly affects the control accuracy of the active power filter

Method used

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
View more

Image

Smart Image Click on the blue labels to locate them in the text.
Viewing Examples
Smart Image
  • Sliding mode control method of novel three-phase three-wire system active filter
  • Sliding mode control method of novel three-phase three-wire system active filter
  • Sliding mode control method of novel three-phase three-wire system active filter

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0025] The present invention will be further described below in conjunction with the accompanying drawings.

[0026] In the present invention, since the control of the active power filter is realized by constantly switching the direction of the DC side voltage, improving the sliding mode surface is the key to improving the sliding mode variable structure control effect.

[0027] figure 1 It is a block diagram of a new type of three-phase three-wire active power filter sliding mode variable structure control structure. supply current Should be a sine wave in phase with the voltage; is the load current, which contains certain harmonics; is the actual compensation current. According to Kirchhoff's current law:

[0028] (1)

[0029] The state equation of the three-phase three-wire active filter is as follows:

[0030] (2)

[0031] in

[0032] (3)

[0033] switch function

[0034] The load current harmonic ...

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

PUM

No PUM Login to view more

Abstract

The invention discloses a sliding mode control method of a novel three-phase three-wire system active filter, which is characterized by comprising the following steps of: 1, detecting three-phase harmonic current signals in load currents by a load current harmonic detection module; 2, detecting actual three-phase compensation current signals of a compensation circuit by a compensation current detection module; 3, subtracting corresponding three-phase compensation current signals by the three-phase harmonic current signals respectively to obtain tracking control errors of harmonic currents; 4, utilizing tracking control errors of each phase current, differential coefficients of the errors and integration of the errors to form a sliding mode surface of a sliding mode structure; and 5, carrying out PWM (pulse width modulation) on output of a sliding mode controller, and generating control signals to switching on / off of an IGBT (insulated gate bipolar transistor). The sliding mode control method is simple in computation and easy to realize, and can be used to effectively reduce the tracking errors of the harmonic currents, weaken buffeting of supply currents, reduce harmonic contents of compensated supply currents, and improve the control accuracy of the active filter.

Description

technical field [0001] The patent of the present invention belongs to the technical field of active power filter, and in particular relates to a sliding mode variable structure control method of an active power filter. Background technique [0002] In contemporary society, the large-scale application of various nonlinear and time-varying electronic devices such as inverters, rectifiers and various switching power supplies has brought about power quality problems in power systems. The so-called power quality problems mainly refer to the low power factor of the grid, waveform distortion, surge, phase distortion and so on. Active Power Filter (APF—Active Power Filter) can be used for power system harmonic suppression and reactive current compensation. Its principle is to make the compensation circuit generate harmonic current Compensation current with equal magnitude and opposite direction to offset the harmonic current in the load current. In actual operation, it is equival...

Claims

the structure of the environmentally friendly knitted fabric provided by the present invention; figure 2 Flow chart of the yarn wrapping machine for environmentally friendly knitted fabrics and storage devices; image 3 Is the parameter map of the yarn covering machine
Login to view more

Application Information

Patent Timeline
no application Login to view more
Patent Type & Authority Applications(China)
IPC IPC(8): H02J3/01
CPCY02E40/40
Inventor 费峻涛李天华戴卫力
Owner HOHAI UNIV CHANGZHOU
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Try Eureka
PatSnap group products