Power unit loss calculation method and device

Abstract

The present invention provides a power unit loss calculation method and a power unit loss calculation device. The power unit loss calculation device comprises a direct-current power source, a pre-charging module, a power unit module, a detection device, a control calculation module and a man-machine interface module; the direct-current side output end positive pole of the direct-current power source is connected with the input end of the pre-charging module; the output end of the pre-charging module is connected with the direct-current side positive pole of the power unit module; the direct-current side output end negative pole of the a direct-current power source is connected with the direct-current side negative pole of the power unit module; the alternating-current output side of the power unit module is connected in parallel with a load resistor; the detection device is used for measuring the voltage and current data of the power unit module and sending the detected data to the control calculation module; the control calculation module is used for sending switching signals to the power unit module; and the power unit module outputs rated power and sends a loss calculation result to a man-machine interface. With the device provided by the invention adopted, the output voltage control and protection function of the power unit module can be realized, and a calculation process is simple.

Description

technical field [0001] The present invention relates to the field of loss analysis of high-voltage and high-power power electronic devices, in particular to a power unit loss calculation method and device, in particular to the loss calculation method and methods for power modules connected in series in modular multilevel converters device. Background technique [0002] With the development of modular multi-level technology, the application range of high-power power electronic devices (such as IGBT) is continuously expanding. In the application of high-power occasions, high-power power electronic devices are usually composed of power units, and then The cascaded connection of levels constitutes a modular multilevel converter, and its power unit is usually a half-bridge structure or a full-bridge structure, of which the half-bridge structure is mainly used in the field of DC transmission, and the full-bridge structure is mainly used in reactive power compensation or high-power...

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Problems solved by technology

In this regard, the paper "Loss Calculation of Modular Multilevel Converter, Power System Automation [J], 2015, 39(2): 112-118" published by Wang Haitian, Tang Guangfu, He Zhiyuan, etc. gives a A calculation method of switching loss, but only a brief description of the principle of loss calculation, and only for half-bridge structure power units, not involving full-bridge power units, and also does not involve the realization method and device design of loss calculation, the actual industry Difficulty applying

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