A Stability Criterion Method Applicable to Multi-voltage Level DC Distribution System

A multi-voltage level, DC power distribution technology, applied in the direction of DC network circuit devices, electrical components, circuit devices, etc., can solve the problem of not considering multiple voltage levels of the system, and achieve the effect of wide application and overcoming limitations.

Active Publication Date: 2022-04-15
SOUTHEAST UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the above studies are all aimed at single-bus DC power distribution systems, without considering the system with multiple voltage levels, such as two-stage photovoltaic grid-connected systems, medium and low voltage DC power distribution systems, etc., DC buses of different voltage levels pass through DC Transformer for Interconnection

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 Stability Criterion Method Applicable to Multi-voltage Level DC Distribution System
  • A Stability Criterion Method Applicable to Multi-voltage Level DC Distribution System
  • A Stability Criterion Method Applicable to Multi-voltage Level DC Distribution System

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

[0028] Medium and low voltage DC power distribution system is a typical application of multi-voltage level DC power distribution system. Its topology is as follows: figure 1 As shown, it consists of a medium voltage DC bus and a low voltage DC bus. According to the definition of BVCC (bus voltage controlled converter, bus voltage controlled converter) and BCCC (bus current controlled converter, bus current controlled converter), its unified form can be obtained, such as figure 2 As shown, N 1 BVCC and N 2 BCCCs, N connected in parallel on the low-voltage DC bus 3 BVCC and N 4 A BCCC, a DC transformer realizes the interconnection of medium and low voltage DC buses, and plays the role of voltage matching and power exchange. In a broad sense, the medium voltage DC bus can represent the DC bus with a higher voltage level in the multi-voltage leve...

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 stability criterion method suitable for multi-voltage level DC power distribution systems. The impedance criterion includes: firstly, according to the definition of the control bus voltage type converter and the control bus current type converter, the multi-voltage level is obtained The unified expression form of the DC power distribution system; secondly, small-signal modeling is carried out for each converter, and two ports of the DC power distribution system with a unified form and multi-voltage levels are established for the two cases where the DC transformer adopts output voltage and output current control methods respectively. Small-signal model; then, deduce the transfer function from each input variable to each output variable of the system and the equivalent loop gain expression of the system; finally, judge the stability of the system by whether the equivalent loop gain of the system satisfies the Nyquist stability criterion, If the equivalent loop gain satisfies the Nyquist stability criterion, the system is stable; otherwise, the system is unstable. The invention extends the impedance ratio criterion of the existing DC power distribution system to the multi-voltage level DC power distribution system, and has a wider application range.

Description

technical field [0001] The invention relates to the technical field of DC power distribution systems, in particular to a stability criterion method suitable for multi-voltage level DC power distribution systems. Background technique [0002] With the development of new energy, DC load and power electronics technology, DC power distribution system has been widely used due to its advantages of flexibility and high efficiency. The DC power distribution system is composed of multiple feedback-controlled converters. Although each converter is stable when working alone, due to the negative resistance characteristics of its input impedance and the impedance mismatch of cascaded converters, the DC bus voltage is prone to low-frequency oscillation. Not even stable. Therefore, the stability of the DC power distribution system needs to be solved urgently. [0003] Scholars at home and abroad first studied the stability of simple cascaded systems such as single-source single-load, sin...

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): H02J1/00
Inventor 陈武潘鹏鹏
Owner SOUTHEAST 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