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A Method for Clearing Short-Circuit Faults on DC Side of Flexible DC Grid

A short-circuit fault, flexible DC technology, applied in emergency protection circuit devices, electrical components, etc., can solve the problems of DC circuit breaker failure, short-circuit fault cannot be completely cleared, etc. the effect of luck

Active Publication Date: 2019-05-10
ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] Aiming at the above-mentioned problems in the prior art, the present invention provides a method for clearing the short-circuit fault on the DC side of the flexible DC power grid, so as to solve the problem that the short-circuit fault caused by the failure of the DC circuit breaker cannot be completely solved under the premise of avoiding the outage of the entire flexible DC power grid. clear question

Method used

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  • A Method for Clearing Short-Circuit Faults on DC Side of Flexible DC Grid
  • A Method for Clearing Short-Circuit Faults on DC Side of Flexible DC Grid
  • A Method for Clearing Short-Circuit Faults on DC Side of Flexible DC Grid

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Embodiment 1

[0022] This embodiment introduces a method for clearing the short-circuit fault when a single-pole-to-ground short-circuit fault occurs in the flexible DC grid, that is, when a ground-to-ground short-circuit fault occurs on a certain DC transmission line in the positive transmission system or the negative transmission system of the flexible DC grid.

[0023] like image 3 As shown in , assuming that the protection system detects a single-pole-to-ground short-circuit fault on the DC transmission line PDC12, the short-circuit fault is cleared according to the following method, such as Figure 5 Shown:

[0024] S1: Send a trip instruction to all first target DC circuit breakers, and send a backup instruction to all second target DC circuit breakers and all target AC circuit breakers at the same time. Among them, the first target DC circuit breaker is a DC circuit breaker on the fault line; the second target DC circuit breaker is a DC circuit breaker connected to the bus bar conn...

Embodiment 2

[0034] This embodiment introduces a method for clearing the short-circuit fault when a bipolar-to-ground short-circuit fault occurs in the flexible DC grid, that is, when a certain DC transmission line in the positive transmission system of the flexible DC grid and a corresponding DC transmission line in the negative transmission system both have a ground-to-ground short-circuit fault.

[0035] like image 3 and Figure 4 As shown in , assuming that the protection system detects a double-pole grounding short-circuit fault on the DC transmission line PDC12 and NDC12, the short-circuit fault is cleared according to the following method, as Figure 5 Shown:

[0036] S1: Send trip commands to the first target DC circuit breakers PCB12, NCB12, PCB21 and NCB21, and send trip commands to the second target DC circuit breakers PCB13, NCB13, PCB24 and NCB24, and target AC circuit breakers PACCB1, NACCB1, PACCB2 and NACCB2 Alternate instructions.

[0037] S2: Detect whether the fault ...

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Abstract

The invention provides a method for eliminating the DC-side short-circuit fault of a flexible DC power grid and relates to the technical field of flexible DC power transmission. According to the invention, on the premise that the outage condition of an entire flexible DC power grid is avoided, the problem in the prior art that short-circuit faults caused by the failure of a DC circuit breaker cannot be thoroughly removed can be solved. The method comprises the following steps of sending a tripping instruction to all first target DC circuit breakers, and sending a standby instruction to all second target DC circuit breakers and all target AC circuit breakers; detecting whether each first target DC circuit breaker successfully trips or not within a preset period of time, sending a trippinginstruction to a second target DC circuit breaker and a target AC circuit breaker of a circuit breaker adjacent to the non-tripped circuit breaker on the condition that at least one first target DC circuit breaker does not successfully trip within the preset period of time, and shutting the target DC circuit breaker of the circuit breaker adjacent to the non-tripped circuit breaker. Based on the above technical scheme of the invention, the method can be applied to the flexible DC power grid based on a modular multilevel converter.

Description

technical field [0001] The invention relates to the technical field of flexible direct current transmission, in particular to a method for clearing short circuit faults on the direct current side of a flexible direct current grid. Background technique [0002] In recent years, with the development of flexible DC technology and engineering applications based on insulated gate bipolar transistor (English name: Insulated Gate Bipolar Transistor, referred to as IGBT) fully controlled devices, based on the voltage source DC converter (English name: Voltage Source Converter , referred to as VSC) flexible DC grid technology has received more and more attention. There are various structures of voltage source DC converters, among which the modular multilevel converter (English name: ModularMultilevel Converter, MMC for short) is a new type of voltage source DC converter structure, compared with the traditional The low-level voltage source DC converter has the advantages of small swi...

Claims

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Application Information

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IPC IPC(8): H02H7/26
Inventor 彭发喜李明李岩许树楷黄伟煌郭铸
Owner ELECTRIC POWER RESEARCH INSTITUTE, CHINA SOUTHERN POWER GRID CO LTD