Valve base control protection method

A technology of valve base control and valve base control equipment, applied in emergency protection circuit devices, power transmission AC networks, electrical components, etc., can solve the problems of sub-module IGBT avalanche breakdown, sub-module damage, etc., to improve reliability, The effect of reducing voltage stress

Active Publication Date: 2020-12-08
STATE GRID CORP OF CHINA +1
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0006] In view of this, the embodiment of the present invention provides a valve-base control and protection method to solve the problem in the prior art that when the valve-base control device fails, the sub-module is damaged, and in severe cases, it will cause avalanche breakdown of a large number of sub-module IGBTs

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Embodiment Construction

[0022] The technical solutions of the present invention will be clearly and completely described below in conjunction with the accompanying drawings. Apparently, the described embodiments are some of the embodiments of the present invention, but not all of them. Based on the embodiments of the present invention, all other embodiments obtained by persons of ordinary skill in the art without making creative efforts belong to the protection scope of the present invention.

[0023] In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" etc. The indicated orientation or positional relationship is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, ...

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Abstract

The invention discloses a valve base control protection method which comprises the following steps:when valve base control equipment is detected, and the valve base control equipment breaks down, timing is started, and fault duration time is generated; when the fault duration exceeds first preset time and a locking instruction issued by an upper-layer control unit is not received, the valve base control equipment generates a locking converter valve signal and outputs the locking converter valve signal; and when the fault duration exceeds second preset time and the second preset time is longerthan the first preset time, the valve base control equipment generates a converter valve operation quitting signal and outputs the converter valve operation quitting signal. By implementing the method, under the condition of not additionally increasing physical connection among control units, when any layer of the valve base control equipment breaks down, the converter valve can be controlled to be stably transited to a locking state and an outage state, so that the converter valve is ensured to be in a controlled state in the whole process; strategies such as redundant system switching and locking of all sub-modules at the same moment are fully considered, and the voltage pressure borne by the converter valve sub-modules during faults is reduced.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a valve base control and protection method. Background technique [0002] Flexible DC transmission based on Modular Multilevel Converter (MMC) is known as the third-generation transmission technology after AC transmission and conventional DC transmission. It has broad application prospects in load power supply, grid interconnection, island / drilling platform power supply and other fields. [0003] The core equipment of the flexible DC transmission project mainly includes the converter valve (VALVE), valve-based control equipment (ValveBased Control, VBC) and pole control and protection system (Pole Control and Protection, PCP), etc. Among them, the converter valve is responsible for DC-AC conversion and AC-DC conversion in the flexible DC transmission project. Hundreds or even thousands of sub-modules are connected in series, and each sub-module must ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02H7/122H02H7/125H02J3/36
CPCH02H7/122H02H7/125H02J3/36Y02E60/60
Inventor 谢敏华路建良唐茹彬李强武思捷
Owner STATE GRID CORP OF CHINA
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