Split-phase control method of asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system

A hybrid energy storage system, cascaded multi-level technology, applied in the direction of collectors, electric vehicles, electrical components, etc., can solve problems such as ineffective control of asymmetric faults, prevent overmodulation, improve stability, and suppress output. The effect of current harmonics

Active Publication Date: 2019-07-12
NANJING UNIV OF SCI & TECH
View PDF2 Cites 3 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The traditional decoupling control method cannot effectively control the asymmetrical fault because it cannot independently realize the internal power distribution of each phase.

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
  • Split-phase control method of asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system
  • Split-phase control method of asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system
  • Split-phase control method of asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment

[0084] In order to verify the validity of the present invention, set up experimental simulation model in Matlab / Simulink, system actual parameter and equivalent parameter are as follows:

[0085] Table 1 System Actual Parameters

[0086] parameter symbol value Link rated voltage V bat

[0087] Table 2 Equivalent parameter table

[0088] parameter symbol A B C battery link M 15 10 5 Rated voltage MV bat

[0089] The simulation results in inductive and capacitive modes are as follows Figure 7-8 As shown, the A-phase current reference phase is -85.94° in the inductive mode, and the A-phase current reference phase is +94.06° in the capacitive mode. In both modes, the current can track the command within the stable range, and the DC side voltage of the capacitor link remains stable near the reference value, and no over-modulation occurs. By comparing the working states within the stable working range and outside the stable wo...

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 split-phase control method of an asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system. The method comprises the steps of: analyzing the stable ranges of the output voltage and the output current of a single-phase battery chain link, and determining the working range of a three-phase star-shaped system; performing open-loop voltage control oneach phase of the battery chain link to allow each battery chain link to output a command voltage so as to achieve charge-discharge balance; calculating the phases of the active current and the reactive current of a capacitor chain link according to a power grid voltage and an open-loop voltage; and performing active current control, reactive current control and power grid voltage feedforward control for each phase of the capacitor chain link to allow each capacitor chain link to output a command current and maintain the capacitor voltage to be stable. The split-phase control method of the asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system performs split phase control in the three-phase common stable working range to improve the four-quadrant operation stability of the system, prevent the chain link unit from overmodulation and suppress the output current harmonics, and therefore, the split-phase control method of the asymmetric three-phase star-shaped cascade multilevel hybrid energy storage system is suitable for the asymmetric fault conditions.

Description

technical field [0001] The invention relates to power electronics technology, in particular to a phase-splitting control method for an asymmetrical three-phase star-shaped cascaded multi-level hybrid energy storage system. Background technique [0002] The hybrid energy storage system based on cascaded multilevel converters can effectively improve system performance and save maintenance costs by combining different types of DC voltage sources. The battery has a high energy density, and the maintenance cost of the capacitor is low. Using the battery and the capacitor together as the H-bridge DC side voltage source enables the system to have a four-quadrant operation capability and obtain a higher output voltage level at a lower cost. . When an asymmetrical fault occurs in the battery chain links of each phase, the faulty battery module needs to be removed, and the system is transformed into an asymmetrical three-phase cascaded multi-level hybrid energy storage system. The t...

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): H02J3/38H02J3/32H02J7/34
CPCH02J3/38H02J3/32H02J7/345
Inventor 张越刘钊赵珊珊冯俊牟龚健
Owner NANJING UNIV OF SCI & TECH
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