Supercharge Your Innovation With Domain-Expert AI Agents!

MMC-HVDC system disturbance suppression method and device, and medium

A technology of MMC-HVDC and disturbance suppression, which is applied in the direction of power transmission AC network, etc., can solve the influence of internal sub-module voltage fluctuation characteristics, and there are few discussions on suppression, the anti-interference performance is not very satisfactory, and it cannot respond to the influence of external disturbances Mechanism and other issues to achieve superior anti-interference performance, improve dynamic response characteristics, and improve the effect of dynamic response performance

Inactive Publication Date: 2021-05-14
HOHAI UNIV
View PDF0 Cites 0 Cited by
  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0003] Compared with traditional two-level voltage source converters, MMC-HVDC contains dozens or even hundreds of cascaded sub-module units, and its dynamic behavior is more complex under external disturbances.
However, conventional MMC-HVDC control strategies include AC current control and circulation suppression strategies, which cannot reflect the impact mechanism of external disturbances on the dynamics of the system.
Although this scheme is widely adopted because of its simplicity and ease of implementation, it has also been proven to effectively ensure the stable operation of MMC-HVDC, but its anti-interference performance is not very satisfactory, and sudden changes in the operating state caused by external disturbances or faults may lead to system response Poor characteristics, even unstable
Generally speaking, most of the existing studies start with the fault ride-through characteristics or damping enhancement characteristics of the MMC-HVDC system, and there are few discussions on the influence and suppression of the system transient process on the voltage fluctuation characteristics of the internal sub-modules.

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
  • MMC-HVDC system disturbance suppression method and device, and medium
  • MMC-HVDC system disturbance suppression method and device, and medium
  • MMC-HVDC system disturbance suppression method and device, and medium

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0046]This embodiment provides a method for suppressing disturbances in the MMC-HVDC system considering the voltage fluctuation characteristics of the sub-modules.

[0047] figure 1 It is a schematic diagram of the topological structure of the MMC converter of the embodiment of the present invention. like figure 1 As shown, the adopted MMC converter topology includes sub-modules, bridge arm inductance L 0 and equivalent resistance R 0 , the proposed method of the present invention aims at figure 1 The physical system of the actual MMC converter is controlled, and the dependent hardware system is the relevant hardware equipped with the existing MMC controller. First, for the MMC-HVDC system, the AC side current i of the phase unit j j for

[0048]

[0049] In the formula, I j is the effective value of the AC side current, ω is the fundamental frequency, is the phase angle. Since the upper and lower arm currents of the MMC consist of a DC component and a fundamental...

Embodiment 2

[0103] This embodiment provides an MMC-HVDC system disturbance suppression device, the device comprising:

[0104] Fluctuation component acquisition module: real-time acquisition of the differential mode voltage fluctuation component of the entire bridge arm of the phase unit j of the MMC converter

[0105] DP conversion module: convert the differential mode voltage fluctuation component Perform dq transformation to obtain the differential mode voltage fluctuation components of the d-axis and q-axis MMC converter phase unit j respectively and

[0106] Observation module: the differential mode voltage fluctuation component of the phase unit j of the MMC converter and respectively input into the observation equation to obtain the observed quantity of the integrated current and

[0107] Signal input module: the observed quantity of the integrated current and Respectively through the perturbation supplementary module G fd (s) and G fq (s) and send it into the...

Embodiment 3

[0109] The embodiment of the present invention also provides an MMC-HVDC system disturbance suppression device, including a processor and a storage medium;

[0110] The storage medium is used to store instructions;

[0111] The processor is configured to operate according to the instructions to perform the steps of the following method:

[0112] 1) Collect the differential mode voltage fluctuation component of the entire bridge arm of the phase unit j of the MMC converter in real time

[0113] 2) the differential mode voltage fluctuation component Perform dq transformation to obtain the differential mode voltage fluctuation components of the d-axis and q-axis MMC converter phase unit j respectively and

[0114] 3) The differential mode voltage fluctuation component of the phase unit j of the MMC converter and respectively input into the observation equation to obtain the observed quantity of the integrated current and

[0115]

[0116]

[0117] 4) Accor...

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 an MMC-HVDC (Modular Multilevel Converter High Voltage Direct Current) system disturbance suppression method considering the voltage fluctuation characteristic of a sub-module, belongs to the technical field of direct current transmission operation control, effectively enhances the dynamic characteristics of an MMC-HVDC system when external disturbance such as power abrupt change and non-permanent fault occurs, and improves the external interference resistance of the MMC-HVDC system. According to the MMC-HVDC system disturbance suppression method, an additional control link capable of suppressing external disturbance current is provided by analyzing the interaction process of the external disturbance and the voltage fluctuation characteristic of the system sub-module, the link is added to control of the conventional MMC-HVDC system, the internal dynamic performance of the system when the external disturbance occurs is improved, and the oscillation transition process when the system is in a transient state is effectively reduced. The method does not need to add any current / voltage sensor, reduces the system design input cost, and has guiding significance for improving the dynamic response characteristics of the MMC-HVDC system.

Description

technical field [0001] The present invention belongs to the field of research on the operation control of a flexible direct current transmission system (Modular MultilevelConverter High Voltage Direct Current, MMC-HVDC) based on a modular multilevel converter, and more specifically relates to an MMC- HVDC system disturbance suppression method. Background technique [0002] In recent years, with the development of fully-controlled power electronic devices, the flexible DC transmission system (Modular Multilevel Converter High Voltage Direct Current, MMC-HVDC) based on modular multilevel converters has Output performance plays an important role in the field of HVDC transmission technology. Researchers at home and abroad have carried out a series of research on the safe and stable operation of the MMC-HVDC system, mainly focusing on the modulation technology of the converter, the optimization control technology related to the bridge arm, and the coordinated control technology ...

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): H02J3/36
CPCH02J3/36Y02E60/60
Inventor 刘子文赵晋泉
Owner HOHAI UNIV
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