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Total bridge type MMC (Microsoft Management Console)-HVDC (High Voltage Direct Current Transmission) sub-module fault in-situ diagnosing and protecting method

A sub-module and fault technology, applied in the field of power transmission and distribution, can solve problems such as protection without systematic and comprehensive research

Inactive Publication Date: 2013-01-09
NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

There are literatures on the redundant protection of the half-bridge modular multilevel converter HB-MMC, but the full-bridge modular multilevel converter FB-MMC-HVDC sub-module of the HVDC input system Fault diagnosis and post-fault protection have not yet been systematically and comprehensively studied

Method used

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  • Total bridge type MMC (Microsoft Management Console)-HVDC (High Voltage Direct Current Transmission) sub-module fault in-situ diagnosing and protecting method
  • Total bridge type MMC (Microsoft Management Console)-HVDC (High Voltage Direct Current Transmission) sub-module fault in-situ diagnosing and protecting method
  • Total bridge type MMC (Microsoft Management Console)-HVDC (High Voltage Direct Current Transmission) sub-module fault in-situ diagnosing and protecting method

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Embodiment

[0041] A method for on-site fault diagnosis and protection of a full-bridge type MMC-HVDC sub-module, specifically comprising the following steps:

[0042] Step 1: Diagnose the fault of the full-bridge sub-module.

[0043] Common full-bridge sub-module faults generally include power electronic device faults, energy storage capacitor faults, and trigger pulse loss faults.

[0044] (1) Fault diagnosis of power electronic devices: The fault diagnosis of power electronic devices is through real-time monitoring of sub-module bridge arm current, capacitor voltage and electrical quantity data of power electronic devices, and comparing with the state logic in steady state. If the state is inconsistent, then Output fault signal; With the development of power electronics technology, the built-in voltage and current measurement technology of power electronic devices is also developing continuously, which provides the feasibility of this method.

[0045] Table 1 shows the status of the s...

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Abstract

The invention discloses a total bridge type MMC (Microsoft Management Console)-HVDC (High Voltage Direct Current Transmission) sub-module fault in-situ diagnosing and protecting method, belonging to the technical field of power transmission and distribution. According to the technical scheme, the method comprises the following steps: realizing fault in-situ diagnosis through an electric amount and a communication state of a monitoring sub-module, and transmitting a fault signal to a valve base controller (VBC); then locking a fault sub module through a sub module controller (SMC), and triggering a bypass fault sub module of a bypass device, so that the fault sub module and the system can be protected. The invention provides the total bridge type MMC-HVDC sub-module fault in-situ diagnosing and protecting method, which can be used for monitoring the state of the sub module in real time, and protect the system and the fault sub module after the sub module has a fault, and provides a method capable of keeping the system to stably operate when a signal transmission channel is caused by the fault of the superior controller of the communication fault or sub module controller (SMC).

Description

technical field [0001] The invention belongs to the technical field of power transmission and distribution, and in particular relates to a method for on-site fault diagnosis and protection of a full-bridge type MMC-HVDC sub-module. Background technique [0002] Modular multilevel converter MMC has attracted much attention since it was proposed by Siemens. It forms a multi-level output structure by connecting sub-module units in series between the positive and negative DC bus bars of the converter. This topology does not require a large number of insulated gate bipolar transistors to be directly connected in series. The voltage and current change rate of the device is low, and no Filters and other advantages, thus overcoming the withstand voltage and power limitations of the fully-controlled switching devices of traditional two-level and three-level voltage source converters, so it is applied to modular multi-level converters in HVDC transmission The research on MMC-HVDC has...

Claims

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Application Information

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IPC IPC(8): H02M1/32
Inventor 赵成勇李探许建中刘文静
Owner NORTH CHINA ELECTRIC POWER UNIV (BAODING)
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