Compensation method for three-phase unbalanced power inverter compensation device in microgrid

A compensation device, power inverter technology, applied in reactive power adjustment/elimination/compensation, reactive power compensation, reduction/prevention of power oscillation, etc. The effect of strong compensation ability and simple structure

Active Publication Date: 2017-11-10
汉谷云智(武汉)科技有限公司
View PDF7 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0004] The AC three-phase voltage and power output by traditional inverters are balanced, but in distributed power generation systems such as sea islands, many power loads are single-phase, and are distributed unbalanced in the three phases A, B, and C, making The three-phase power imbalance of the microgrid leads to unbalanced three-phase voltage and low voltage of a certain phase, which reduces the quality of power supply and even affects the normal power supply

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
  • Compensation method for three-phase unbalanced power inverter compensation device in microgrid
  • Compensation method for three-phase unbalanced power inverter compensation device in microgrid
  • Compensation method for three-phase unbalanced power inverter compensation device in microgrid

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0013] Embodiments of the present invention will now be described with reference to the drawings, in which like reference numerals represent like elements.

[0014] In one embodiment of the present invention, the inverter power of the phase with high voltage is reduced, and the power of the phase with low voltage is increased, so as to realize the power compensation of the phase with low voltage. The specific feature is that the controller distributes the three-phase grid-connected power evenly according to the output power of the new energy power generation device in the initial state; For the phase with the lowest grid voltage, calculate the voltage difference between other phases and the lowest phase. If the voltage difference is greater than the set threshold, subtract a constant from the output current of the phase with the highest voltage, and increase the current of the lowest phase with an equivalent constant. Until the grid-connected current of the phase with high vol...

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 compensation method of a micro-grid three-phase imbalance power inversion compensation device. The device comprises a new energy power generation device, a power conversion circuit, filter circuits, interphase relays, grid-connected relays and a controller, wherein the controller controls switching-on and switching-off of eight IBGTs in the power conversion circuit, so that direct current generated by the new energy power generation device is inverted into alternating current which is connected into a power grid through the filter circuits and the grid-connected relays. The compensation method includes the following steps: the controller collects three-phase network voltage effective values, frequency and phases in real time, finds out the phase with the lowest network voltage, calculates voltage differences of the phase and other phases, and adjusts three-phase grid-connected power accordingly. When grid-connected current of the phase with the lowest network voltage reaches a rated value of the power conversion circuit, and voltage of the phase is lower, the grid-connected relays of the other phases are switched off, output current of the other phases are set to be in the same phase as the phase, the interphase relays between the other phases and the phase are switched on, and two phases or three phases are connected to the phase, thereby jointly compensating power and voltage of the phase.

Description

technical field [0001] The invention belongs to a compensation method for a micro-grid power inverter compensation device, in particular to a new energy generation micro-grid three-phase unbalanced power inverter with three-phase grid-connected inverter, inter-phase unbalanced power and voltage compensation, and power factor compensation. The compensation method of the compensation device. Background technique [0002] Energy issues have always been an important factor restricting the development of a human society. Every major progress in society is inseparable from the improvement and replacement of energy. In June 2012, the famous American economist Jeremy Rifkin proposed that the world is about to enter the "post-carbon" era, and the third industrial revolution characterized by the combination of Internet technology and renewable energy will be the The hope for sustainable development and avoiding catastrophic climate change. my country is strategically adjusting the c...

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 Patents(China)
IPC IPC(8): H02J3/24H02J3/18H02J3/26
CPCY02E40/30Y02E40/50
Inventor 陈启宏徐香风王吉彪全书海张立炎谢长君黄亮石英杨清
Owner 汉谷云智(武汉)科技有限公司
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