Supercharge Your Innovation With Domain-Expert AI Agents!

A cascaded high-voltage large-capacity energy storage virtual synchronous machine system

A virtual synchronous machine and large-capacity technology, applied in the field of power electronics, can solve the problems of lack of inertia in new energy systems, output fluctuations, and make due contributions to the dynamic stability of power grids, etc., to solve the problems of new energy grid connection, Small harmonic distortion and easy maintenance

Active Publication Date: 2018-12-11
NARI TECH CO LTD +2
View PDF3 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, although the application of energy storage devices in new energy can solve the problem of its output volatility, the lack of inertia of the new energy system still makes it unable to make due contributions to maintaining the dynamic stability of the power grid.

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 cascaded high-voltage large-capacity energy storage virtual synchronous machine system
  • A cascaded high-voltage large-capacity energy storage virtual synchronous machine system
  • A cascaded high-voltage large-capacity energy storage virtual synchronous machine system

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0020] Embodiment 1 is a cascaded high-voltage large-capacity energy storage virtual synchronous machine system, and its topology is as follows figure 1 shown. As shown in the figure, the system includes a step-up transformer, a transmission inductor, and multiple system sub-modules. After each system sub-module is cascaded, it is directly connected to the high-voltage grid through the transmission inductor ( figure 1 10kV power grid), and then connected to the upper high-voltage power grid through a step-up transformer ( figure 1 35kV power grid).

[0021] The cascaded sub-module consists of four parts: energy storage unit, energy storage conversion interface module, bidirectional H-bridge conversion module and control unit. The energy storage unit consists of multiple energy storage batteries connected in series, that is, the energy storage battery pack. The energy storage converter interface module, the bidirectional H-bridge converter module and the control unit togethe...

Embodiment 2

[0029] This embodiment is basically the same as Embodiment 1 except for the specific structure of the energy storage and conversion interface module.

[0030] The specific structure of the energy storage converter interface module in this embodiment is as follows: image 3As shown, it is a non-isolated pre-charging structure, which specifically includes an LCL filter unit, a switching device, and a resistor connected in parallel with the switching device (the resistor can be in the form of a resistor string), and the switching device and the resistor connected in parallel with the switching device constitute The pre-charging circuit, the LCL filter unit is used to filter high-order DC harmonics, the bidirectional H-bridge converter module is connected to one side of the pre-charging circuit through the LCL filter unit, and the energy storage unit is connected to the other side of the pre-charging circuit catch. This solves the floating ground problem of the high-voltage grid,...

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 cascading high-voltage large-capacity energy storage virtual synchronous machine system and a sub-module thereof, and belongs to the technical field of power electronic. The system can realize a high-voltage large-capacity energy storage converter topological structure based on a virtual synchronous generator (VSG) principle, the topology has an ability for accessing an upper-grade high-voltage power grid through a step up transformer, and the control system utilizes the good characteristics of the VSG technology to solve the current new energy grid connected problem perfectly. A power conversion unit can realize the high-voltage large-capacity energy storage virtual synchronous machine technology through a cascading way, the modularized design is easy to realize low voltage and low power and is convenient for system expansion and upgrade, industrialization assembly configuration and system maintenance and replacement.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and mainly relates to a cascaded high-voltage large-capacity energy storage virtual synchronous machine system. Background technique [0002] With the development of society, human's demand for energy is increasing day by day. However, due to the great difference between the new energy power generation system and the traditional power generation device, its large-scale promotion will also face many problems. [0003] In recent years, power electronic devices have played an important role in power grid transmission and distribution, with a wide range of applications, fast and flexible control, and high power conversion efficiency. Aiming at the problem of output power fluctuations in new energy systems, many studies currently use the method of adding energy storage devices to suppress output power fluctuations. The energy storage converter system has been widely used because it solves 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 Patents(China)
IPC IPC(8): H02J3/40H02J3/32
CPCH02J3/32H02J3/40
Inventor 刘建平侯凯何安然蒋应伟张青杰隗华容冯世宁
Owner NARI TECH CO LTD
Features
  • R&D
  • Intellectual Property
  • Life Sciences
  • Materials
  • Tech Scout
Why Patsnap Eureka
  • Unparalleled Data Quality
  • Higher Quality Content
  • 60% Fewer Hallucinations
Social media
Patsnap Eureka Blog
Learn More

Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic, Popular Technical Reports.

© 2025 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap|About US| Contact US: help@patsnap.com