Controllable voltage source type submodule protection method

A voltage source type, sub-module technology, applied in the direction of emergency protection circuit devices, electrical components, etc., can solve problems such as overheating and breakdown of sub-modules

Active Publication Date: 2016-07-27
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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  • Controllable voltage source type submodule protection method
  • Controllable voltage source type submodule protection method
  • Controllable voltage source type submodule 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 obtains the thermal stress state of the key position of the sub-module and components by measuring the temperature of the key position of the sub-module and inverting the internal junction temperature of the power electronic device through the thermal circuit model at the same time; The temperature of key positions and components in the sub-module is compared to realize the protection of the overheating fault of the controllable voltage source type sub-module.

[0069] The invention provides a typical half-bridge sub-module based on an IGBT device. The electrical diagram of the half-bridge sub-module 1 is attached figure 1 As shown, it includes a secondary board 2, an IGBT module 3, a discharge resistor 4 and a DC capacitor 5. Wherein, the IGBT module 3 and the secondary board 2 are key positions whe...

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

Claims

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Application Information

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Patent Type & Authority Applications(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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