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Method and system for determining overvoltage during DC fault of new energy DC external transmission system

A technology for sending out the system and DC faults, applied in the direction of measuring current/voltage, fault location, AC network circuit, etc., to achieve the effect of simple calculation process

Active Publication Date: 2022-02-11
CHINA ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] The present invention proposes a method and system for determining the overvoltage of the new energy DC external transmission system when a DC fault occurs, so as to solve the problem of how to determine the overvoltage of the new energy DC external transmission system when it fails

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  • Method and system for determining overvoltage during DC fault of new energy DC external transmission system
  • Method and system for determining overvoltage during DC fault of new energy DC external transmission system
  • Method and system for determining overvoltage during DC fault of new energy DC external transmission system

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Embodiment Construction

[0076] Exemplary embodiments of the present invention will now be described with reference to the drawings; however, the present invention may be embodied in many different forms and are not limited to the embodiments described herein, which are provided for the purpose of exhaustively and completely disclosing the present invention. invention and fully convey the scope of the invention to those skilled in the art. The terms used in the exemplary embodiments shown in the drawings do not limit the present invention. In the figures, the same units / elements are given the same reference numerals.

[0077] Unless otherwise stated, the terms (including scientific and technical terms) used herein have the meanings commonly understood by those skilled in the art. In addition, it can be understood that terms defined by commonly used dictionaries should be understood to have consistent meanings in the context of their related fields, and should not be understood as idealized or overly ...

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Abstract

The invention discloses a method and system for determining the overvoltage of a new energy DC external transmission system when a DC fault occurs, including: performing an equivalent on the new energy direct current external transmission system to determine an equivalent circuit; based on the equivalent circuit, determining a new The Thevenin equivalent impedance and equivalent voltage source when the energy DC external transmission system fails; based on the Thevenin equivalent impedance and equivalent power supply, determine the new energy machine terminal overvoltage and DC voltage when the new energy DC external transmission system fails. Converter station bus overvoltage. The method of the invention can efficiently and accurately determine the overvoltage when the new energy DC external transmission system fails, the calculation process is simple, and can provide technical support for the control when the new energy external transmission system fails.

Description

technical field [0001] The present invention relates to the technical field of power system overvoltage calculation, and more specifically, relates to a method and system for determining the overvoltage of a new energy DC external transmission system when a DC fault occurs. Background technique [0002] At present, the overvoltage problem at the sending end of UHV DC has seriously affected the consumption of new energy and the safety of related equipment. New energy units have poor tolerance to system overvoltage. When the system voltage changes, new energy units are prone to large-scale high-voltage disconnection, causing serious chain accidents in the power grid. The overvoltage problem of the high-proportion new energy power system seriously restricts the consumption of new energy and the capacity of UHV DC transmission. The overvoltage of the new energy DC external transmission system mainly comes from two aspects. One is that during DC faults such as commutation failur...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J3/00H02J3/38H02J3/36G01R31/08G01R19/165
CPCH02J3/001H02J3/381H02J3/36G01R31/088G01R19/16538H02J2203/20H02J2300/20Y02E60/60
Inventor 徐式蕴孙华东王姝彦王一鸣毕经天赵兵
Owner CHINA ELECTRIC POWER RES INST