Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)

A technology of three-level inverter and three-level inverter, which is applied in the direction of vector control system, control system, motor generator control, etc., can solve the problem of breakdown of DC side capacitance, increase of voltage stress of switching devices, increase of Output voltage waveform harmonic content and other issues

Inactive Publication Date: 2013-08-14
HENAN UNIV OF SCI & TECH
View PDF2 Cites 30 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The unbalanced capacitor voltage will increase the harmonic content of the output voltage waveform, and at the same time in

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
  • Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)
  • Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)
  • Tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation)

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0024] A three-level inverter indirect vector control system based on simplified SVPWM, including the following steps:

[0025] The first step is to establish the main circuit of the NPC three-level inverter. Each phase of the inverter needs 4 IGBT switch tubes, 4 freewheeling diodes, and 2 clamping diodes; the DC side of the entire three-phase inverter is composed of Two capacitors Cl and C2 are connected in series to support and balance the DC side voltage, Cl=C2. Through a certain switching logic control, the phase voltage of the three voltages is generated on the AC side, and a sine wave is synthesized at the output terminal. The mathematical model of the three-level inverter is, let , , is the switching function of the three phases of inverter A, B, and C, then, , the output phase voltage of the inverter is expressed by the switching function as , there are 3×3×3=27 sets of output states in the three phases of the whole three-level inverter, as image 3 The sim...

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 relates to a tri-level inversion indirect vector control system based on simplified SVPWM (space vector pulse width modulation). On bases of the SVPWM simplification algorithm under a 60-degree coordinate system, an asynchronous motor dynamic mathematical model, a vector control fundamental principle and a main circuit in the step A, the tri-level inverter vector control system based on network parameter control (NPC) is established. The method dispenses with judgment that a reference voltage vector is in a large section or a small section, as well as a great deal of trigonometric functional operation, and only requires simple logical judgment, so that nearest three vectors for synthesizing the reference voltage vector can be obtained; and meanwhile, an output switch state equation is introduced in the algorithm, so that midpoint electric potential balance on the direct current side can be effectively controlled, and the method can be easily popularized to inverters with higher level.

Description

technical field [0001] The invention belongs to the field of high-voltage and high-power AC frequency conversion speed regulation, and relates to an indirect vector control system of a diode clamp type (NPC) three-level inverter based on a simplified SVPWM algorithm. Background technique [0002] Since the NPC three-level topology was proposed, it has been widely used in the fields of medium and high voltage AC motor drives, reactive power compensation in power grids, and new energy power generation. Compared with the two-level inverter, the NPC three-level inverter has the characteristics that the output voltage is closer to the sine wave, the voltage change rate is small, the equivalent switching frequency is high, and the harmonic wave is small. However, since the load current passes through the bridge arms of each phase, a certain current will be generated at the midpoint of the DC side, which will make the voltage of the voltage dividing capacitor unbalanced. The unbal...

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
IPC IPC(8): H02P21/08H02P27/08H02M7/487
Inventor 范波赵伟刚许惠史光辉谢冬冬
Owner HENAN UNIV OF SCI & TECH
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

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.

© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap