PWM rectifier DC bus voltage ripple suppression method based on virtual impedance under three-phase voltage imbalance condition

A DC bus voltage and three-phase voltage technology, applied in the direction of irreversible AC power input conversion to DC power output, electrical components, output power conversion devices, etc., can solve the problem of high dependence on mathematical models, increase system cost and complexity , Ripple suppression effect is difficult to meet the predetermined requirements, etc., to achieve the effect of broadening application scenarios, reducing dependence, and avoiding additional losses

Pending Publication Date: 2022-05-10
TIANJIN UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0009] Known DC bus voltage ripple suppression technology, one type relies on additional power electronic converters to buffer the pulsating power, which increases the cost and complexity of the system; the other type controls the output pulsating power of the three-phase PWM rectifier to be zero. The model dependence is high, when the system parameters change, the ripple suppression effect is difficult to meet the predetermined requirements

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
  • PWM rectifier DC bus voltage ripple suppression method based on virtual impedance under three-phase voltage imbalance condition
  • PWM rectifier DC bus voltage ripple suppression method based on virtual impedance under three-phase voltage imbalance condition
  • PWM rectifier DC bus voltage ripple suppression method based on virtual impedance under three-phase voltage imbalance condition

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0049] An adaptive watermark embedding method based on local quality evaluation, comprising the following steps:

[0050] (1) Assume that the original DC bus capacitor C of the three-phase PWM rectifier is 200μF. The control block diagram of the present invention is as figure 1 shown.

[0051](2) Next, in order to determine the virtual capacitance c in step 1 i value so that the virtual capacitor c i Increase from 400μF to 3200μF, according to formula (9) to draw the Bode diagram of the system as figure 2 shown.

[0052] (3) by figure 2 It can be seen from the medium-amplitude-frequency curve that, with the virtual capacitance c i increases, the lower the gain of the system at 100Hz, and combined with formula (5), it can be known that the system at 2f f The voltage ripple will be smaller. but by figure 2 From the phase-frequency curve, it can be seen that with the virtual capacitance c i The shear frequency of the system increases slightly, but the phase margin de...

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 PWM rectifier DC bus voltage ripple suppression method based on virtual impedance under a three-phase voltage imbalance condition, and belongs to the technical field of power electronic control. An existing direct current bus voltage ripple suppression method of a PWM rectifier under the three-phase voltage unbalanced working condition depends on a mathematical model of the PWM rectifier under the initial condition unbalanced working condition, so that the accuracy degree of the mathematical model when parameters change is not fully considered, and when grid-side inductance parameters change, the direct current bus voltage ripple suppression effect is reduced. According to the invention, the output impedance of the three-phase PWM rectifier is changed to suppress voltage ripples, so that the use of a mathematical model of the rectifier is avoided. By adopting the method provided by the invention, the voltage ripples of the direct-current bus can be fully suppressed, the robustness of the system to parameter change is enhanced, and meanwhile, good dynamic and steady-state performance is obtained.

Description

technical field [0001] The invention belongs to the technical field of control of power electronics, and in particular relates to a method for suppressing voltage ripples of a PWM rectifier direct current busbar under a virtual impedance-based three-phase voltage unbalanced working condition. Background technique [0002] The popularity of traditional fuel vehicles has provided great convenience for people's travel, but it has also brought serious environmental pollution problems. At the same time, in order to find alternative energy sources for fossil energy, experts and scholars have carried out extensive and in-depth research on renewable and non-polluting new energy sources, and new energy vehicles have gradually entered the public eye. [0003] In order to realize the charging of new energy vehicles, power electronic converters are essential. As the interface between the AC grid and the power battery of electric vehicles, the three-phase PWM rectifier has the advantage...

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): H02M7/04H02M1/14
CPCH02M7/04H02M1/14
Inventor 张云宋天宝朱新山
Owner TIANJIN UNIV
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