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A controllable voltage source type sub-module protection method

A voltage source type, sub-module technology, applied in emergency protection circuit devices, electrical components and other directions, can solve the problems of sub-module overheating breakdown, etc., to improve safe operation, avoid thermal breakdown, improve reliability and availability. Effect

Active Publication Date: 2018-07-20
STATE GRID CORP OF CHINA +2
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

The above technology does not take necessary considerations for the overheating fault of the sub-module, and there is a problem of overheating breakdown of the sub-module during operation

Method used

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  • A controllable voltage source type sub-module protection method
  • A controllable voltage source type sub-module protection method
  • A controllable voltage source type sub-module protection method

Examples

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Embodiment 1

[0068] Such as Figure 1-9 As shown, the invention of this example provides a controllable voltage source type sub-module protection method. The method of the present invention measures the temperature of the key position of the sub-module, and at the same time inverts the internal junction temperature of the power electronic device through the thermal circuit model, thereby obtaining the key position of the sub-module and the thermal stress state of the components; The key positions in the sub-module are compared with the temperature of the components, and the protection against overheating faults of the controllable voltage source sub-module is realized.

[0069] The invention provides a typical half-bridge sub-module based on IGBT devices. The electrical diagram of the half-bridge submodule 1 is attached figure 1 As shown, it contains the secondary board 2, the IGBT module 3, the discharge resistor 4 and the DC capacitor 5. Among them, the IGBT module 3 and the secondary bo...

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Abstract

The invention relates to a controllable voltage source type submodule protection method, and the method comprises the steps: setting a protection constant value, carrying out temperature sampling and calculation, and carrying out warning or protection operation through a submodule. The method obtains the thermal stress states of key positions and parts of the submodule through measuring the temperature of the key positions of the submodule and the internal temperature, inverted based on a thermal path model, of a power electronic device. Through the reasonably setting of the protection constant value, the method achieves the protection against an overheating fault of a controllable voltage source type submodule.

Description

Technical field: [0001] The invention relates to a module protection method, and more particularly to a controllable voltage source type sub-module protection method. Background technique: [0002] Voltage source converters used for HVDC transmission use fully controlled power electronic devices, including IGBT, IGCT, and GTO. It is essentially different from the traditional current source converter based on thyristor. With its flexible controllability, robustness to power grid conditions, compactness of its own system, convenience of design and construction, and environmental protection, voltage source converters are particularly suitable for asynchronous grid connection, passive / isolated load power supply, and urban Expansion and transformation of distribution network, connection of wind energy, solar energy and other new energy power sources and other applications. [0003] Up to now, the converter valves used for voltage source converters can be divided into two basic types: ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H7/12
Inventor 李泓志高凯张艳军吕铮池浦田李铁
Owner STATE GRID CORP OF CHINA
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