Multi-level power converter state monitoring system and power device loss calculating method

Abstract

The invention relates to a multi-level power converter state monitoring system and a power device loss calculating method. The multi-level power converter state monitoring system comprises a system controller, a gate pole voltage synchronization sampling module, a collector-emitter voltage / current synchronization sampling module, a bottom plate temperature sampling module, and a driving signal trigger and blocking module. The power device loss calculating method comprises the following steps of calculating an IGBT on-state loss, an IGBT open loss, an IGBT turn-off loss, a freewheel diode on-state loss and a freewheel diode reverse recovery loss; and through an IGBT internal thermal model, calculating a temperature rise condition of each layer. In the invention, state parameters of a power device in a multi-level power converter can be collected in real time, a problem of the power device is timely discovered and processed, the multi-level power converter is guaranteed to safely and reliably work, calculating precision of losses of a power module is increased, and each index satisfies an actual engineering demand. The system and the method have an important meaning for increasing system reliability.

Description

technical field [0001] The invention belongs to the technical field of multi-level power converters, in particular to a multi-level power converter state monitoring system and a power device loss calculation method. Background technique [0002] With the wide application of IGBT modules in the field of power electronic energy conversion (such as power converters and motor drives, etc.), the reliability of IGBT modules has become more and more important. The reasons are as follows: (1) The IGBT module is the most important component of the power electronic system to achieve commutation, so its working conditions are relatively harsh and prone to failure; (2) In the high-power power electronic conversion In the converter, the volume of power devices, systems and equipment will become smaller and smaller, which makes the heat dissipation problem of the system with increasing unit power density become increasingly prominent. Therefore, the research on the thermal performance of...

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Problems solved by technology

[0004] The purpose of the present invention is to overcome the deficiencies of the prior art, propose a multi-level power converter state monitoring system and power device loss calculation method, solve the problem of real-time online monitoring of multi-level power converters and multi-level power conversion Accurate Calculation of Power Device Loss in Devices

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