Online replacement control device and method for power module of power electronic transformer system

Abstract

The invention provides an online replacement control device and method for a power module of a power electronic transformer system, and the device is characterized in that a first bypass switch is connected to an AC input end in parallel; a first auxiliary power supply is used for taking power from the DC side of the first AC / DC unit; a first control module is used for controlling the first bypassswitch to be switched on when the power module needs to be replaced, controlling the first bypass switch to be switched off after the power module is replaced and powered on again and sending a powertaking stopping instruction to the second control module; a second bypass switch is connected in series with the DC output end; a second auxiliary power supply is used for taking power from an external power supply; and a second control module is used for controlling the second bypass switch to be switched off when the power module needs to be replaced, controlling the second bypass switch to beswitched on after the power module is replaced, controlling the replaced power module to take electricity from the direct-current side of the second AC / DC unit to charge the direct-current bus capacitor, and controlling the replaced power module to stop taking power from the DC side of the second AC / DC unit according to the power taking stopping instruction.

Description

technical field [0001] The invention relates to the technical field of power electronic transformer systems, in particular to a power module online replacement control device for a power electronic transformer system and a power module online replacement control method for a power electronic transformer system. Background technique [0002] At present, in order to realize the function of online replacement of power modules in the power electronic transformer system, the external power supply method is generally adopted. This method needs to add an isolation transformer to the power electronic transformer system, which not only increases the system volume, but also increases the cost and reduces the efficiency. Contents of the invention [0003] To solve the above technical problems, the present invention provides a power module online replacement control device and method for a power electronic transformer system, which can effectively reduce the volume and cost of the powe...

AI Technical Summary

Problems solved by technology

[0002] At present, in order to realize the function of online replacement of power modules in the power electronic transformer system, the external power supply method is generally adopted. This method needs to add an isolation transformer to the power electronic transformer system, which not only increases the volume of the system, but also increases the cost and reduces the efficiency.

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