Looking for breakthrough ideas for innovation challenges? Try Patsnap Eureka!

A DC capacitor voltage balance control method under grid single-phase fault

A technology of DC capacitance and voltage balance, which is applied in parallel feeding arrangement of single network, AC circuit arrangement for emergency treatment, conversion of DC power input to DC power output, etc. It can solve the problems of power imbalance between phases and prevent overvoltage damage. , low cost, and the effect of flexible expansion

Active Publication Date: 2022-07-15
TIANJIN UNIV
View PDF4 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Literature [23] proposed a delta-connected cascaded converter structure suitable for large-scale photovoltaic grid-connection and a solution to the power imbalance between phases, in which three power coefficients were defined to characterize the actual power flow of the three phases, and then to solve control studies for the grid fault conditions are not involved

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
  • A DC capacitor voltage balance control method under grid single-phase fault
  • A DC capacitor voltage balance control method under grid single-phase fault
  • A DC capacitor voltage balance control method under grid single-phase fault

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0041] The present invention will be further described in detail below with reference to the accompanying drawings and specific embodiments. It should be understood that the specific embodiments described herein are only used to explain the present invention, but not to limit the present invention.

[0042] 1. About the structure of the power router

[0043] In the energy Internet and integrated energy systems, the inherent DC port of the power router has obvious structural advantages to increase the access ratio of new energy and meet the growing demand for DC power. The three-level topology of the delta-connected cascaded power router is as follows: figure 1 shown. Among them, the front stage (AC / DC converter) adopts a cascaded H-bridge (CHB) structure, each phase is composed of N sub-modules in series, and the DC capacitor voltage on the output side is V dcj (j=1,2,...,3N), it can be directly connected to the medium / high voltage distribution network, thus eliminating the...

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 DC capacitor voltage balance control method under grid single-phase fault, and proposes a three-layer structure DC capacitor voltage balance control strategy for the problem that traditional methods cannot achieve DC capacitor voltage balance of power routers under grid fault. The first layer realizes total DC voltage and power control; in the middle layer, based on the theoretical analysis results of three-phase power, the zero-sequence current that needs to be injected is obtained through the positive and negative sequence components of the grid voltage, and then the phase-to-phase power caused by grid faults is solved. Unbalance problem; bottom layer, realizes sub-module DC capacitor voltage control within the phase. A three-phase power router simulation platform is built in the MATLAB / SIMULINK environment, and the simulation results show that when a certain phase grid fails (the grid voltage drops by 95%), the method proposed in the present invention can maintain the DC capacitor voltage balance control of the power router. The correctness and effectiveness of the proposed method are verified.

Description

technical field [0001] The invention relates to the field of power router control, in particular to a DC capacitor voltage balance control method under the single-phase fault of the power grid. Background technique [0002] Energy is the basis for human survival and development, the lifeblood of the national economy, and is related to the fundamentals of the country. Therefore, energy supply has always been the focus of all countries in the world. To this end, many scholars have proposed solutions to build a global energy internet or integrated energy system, so as to provide countries with safer, more economical, cleaner and sustainable energy [1] , which will promote the integration of new energy power generation (such as wind power, photovoltaic, etc.) in the distribution grid system, increase the proportion of electric energy in terminal energy consumption, and solve the ecological environment and energy caused by excessive dependence on fossil energy in energy consumpti...

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): H02J3/26H02J3/46
CPCH02J3/26H02J3/46H02J2203/20H02M1/007H02J3/001H02M3/33573H02M3/33584H02M7/219H02M1/0096
Inventor 肖迁穆云飞贾宏杰侯恺陆文标余晓丹
Owner TIANJIN UNIV
Who we serve
  • R&D Engineer
  • R&D Manager
  • IP Professional
Why Patsnap Eureka
  • Industry Leading Data Capabilities
  • Powerful AI technology
  • Patent DNA Extraction
Social media
Patsnap Eureka Blog
Learn More
PatSnap group products