Chained SVG DC bus voltage control method and control system

A technology of DC bus voltage and control method, which is applied in flexible AC power transmission system, AC network circuit, electrical components, etc., and can solve problems such as unbalanced SVG DC bus voltage

Active Publication Date: 2021-04-23
GUANGDONG UNLIMITED POWER CO LTD
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

For this reason, the present invention proposes a chained SVG DC bus voltage control method, which solves the problem of unbalanced SVG DC bus voltage when the grid voltage is unbalanced

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
  • Chained SVG DC bus voltage control method and control system
  • Chained SVG DC bus voltage control method and control system
  • Chained SVG DC bus voltage control method and control system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0056] Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary only for explaining the present invention and should not be construed as limiting the present invention.

[0057] In the description of the present invention, if there are descriptions of first, second, third, fourth, etc., it is only for the purpose of distinguishing technical features, and it cannot be understood as indicating or implying relative importance or implicitly indicating the indicated The number of technical features or implicitly indicates the sequence of the indicated technical features.

[0058] In the description of the present invention, unless otherwise clearly defined, terms such as setting and connecting should be unders...

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 chained SVG direct current bus voltage control method and system. The chained SVG direct current bus voltage control method comprises the following steps that: the amplitude and phase angle of the positive sequence voltage of each phase and the amplitude and phase angle of the negative sequence voltage of each phase are calculated; positive sequence current is calculated, which specifically comprises the following steps that: S21) the DC side average voltage of each phase link is calculated, S22) a three-phase active power average value and the active power of each phase are outputted, S23) the positive sequence active current of each phase is calculated, S24) the amplitude and the phase angle of the positive sequence current of each phase is calculated; negative sequence current is calculated, which comprises the following steps that: S31) a D-axis component and a Q-axis component of the negative sequence current of each phase are calculated, S32) the amplitude and the phase angle of the negative sequence current of each phase are calculated; and combination is performed to obtain a three-phase current given value of a chain type SVG current control loop. According to the control method and control system of the embodiment of the invention, a problem that the DC side voltage of a chain-type SVG link is not balanced can be solved, the overvoltage fault of a module in the link can be prevented, and the SVG can give full play to the reactive compensation.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a chained SVG DC bus voltage control method and a control system. Background technique [0002] Static Var Generation (SVG for short) is widely used in many occasions such as compensating load reactive power and stabilizing grid voltage due to its many advantages such as fast reactive power adjustment and modular generation. [0003] At present, most applications of star-linked SVG are based on the condition of power grid balance, but in practical applications, some unbalanced working conditions often appear in the power system. When asymmetrical faults, asymmetrical line impedance and other problems cause unbalanced grid voltage, the star-connected SVG DC bus voltage will be unbalanced, and even some modules will be overvoltage, which will cause SVG to go off-grid and affect the power grid. power quality. Contents of the invention [0004] The present i...

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): H02J3/18
CPCH02J3/1857H02J3/1864Y02E40/10
Inventor 李阳彭国平史奔段博宋海军
Owner GUANGDONG UNLIMITED POWER CO LTD
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