Multiple-inverter parallel control method for quickly restraining harmonic circulating current

A multi-inverter, harmonic circulating current technology, applied in harmonic reduction devices, AC networks to reduce harmonics/ripples, sustainable manufacturing/processing, etc. output voltage distortion rate of the device, etc.

Active Publication Date: 2015-05-27
HUNAN UNIV
View PDF5 Cites 16 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

At present, the method of virtual impedance is generally used to reduce the circulating current, and the suppression effect on the fundamental circulating cur

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
  • Multiple-inverter parallel control method for quickly restraining harmonic circulating current
  • Multiple-inverter parallel control method for quickly restraining harmonic circulating current
  • Multiple-inverter parallel control method for quickly restraining harmonic circulating current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0040] figure 1 It is a schematic diagram of a multi-inverter parallel structure in an embodiment of the present invention, including a three-phase inverter system, a control system, a line impedance, a microgrid AC bus, and a three-phase load; the three-phase inverter system includes a DC energy storage capacitor, three Phase inverter bridge, LCL filter circuit; DC energy storage capacitor, three-phase inverter bridge, LCL filter circuit, line impedance, microgrid AC bus, and three-phase load are connected in sequence. The control system includes DSP controller, A / D sampling circuit, phase-locked loop module and drive protection circuit.

[0041] figure 2 It is a schematic diagram of a multi-inverter parallel control method for rapid harmonic circulating current suppression in an embodiment of the present invention, mainly consisting of a harmonic circulating current suppression part, a variable window sliding average power calculation module, a phase-locked loop module, a ...

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 multiple-inverter parallel control method for quickly restraining harmonic circulating current. The method comprises the following steps: obtaining harmonic circulating current of output current of inverters by adopting an ip-iq algorithm, reversing the phase of the harmonic circulating current to be superposed to a voltage loop to be output to obtain an instruction of a current regulating loop, so that the harmonic circulating current of the output current of the inverters can be efficiently and quickly restrained, and the fact that the harmonic circulating current is restrained through parallel connection of multiple inverters is realized. The invention further provides a variable-window computing method for the moving average power to improve the average power calculation, reduce deviation caused by conventional fixed period calculation and improve the calculating accuracy for average power; with the moving average calculation, the average power can be calculated once in each sampling period, so that the real-time property for power calculation is greatly improved, the power sharing can be well realized through performing droop control on power, the harmonic circulating current can be further reduced. The multiple-inverter parallel control method for quickly restraining the harmonic circulating current can be widely applied to a multiple-inverter parallel control system of a microgrid, and especially suitable for a microgrid with nonlinear load operation.

Description

technical field [0001] The invention relates to the technical field of multi-inverter parallel control of a microgrid, in particular to a multi-inverter parallel control method for fast harmonic circulation suppression. Background technique [0002] With the increasingly severe global energy crisis and environmental pollution, people pay more and more attention to the development and utilization of new energy. As a widely distributed and efficient clean energy, new energy will replace traditional energy more and more. At present, new energy power generation is considered to be the most promising new energy technology in the world, and countries have invested huge sums of money in research and development, and vigorously expand its market application. As an effective means for the development and utilization of new energy, microgrid can efficiently utilize distributed power. [0003] A key issue in the operation of the microgrid is the parallel operation of multiple inverter...

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): H02J3/38H02J3/01
CPCH02J3/01H02J3/38Y02E40/40Y02P80/14
Inventor 罗安周小平陈燕东周乐明李鸣慎匡慧敏伍文华杨苓怀坤山
Owner HUNAN 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