A kind of igct-based dc network voltage sudden change test device and its application method

Abstract

The invention discloses an IGCT-based direct current network voltage sudden change testing device and an application method of the IGCT-based direct current network voltage sudden change testing device. The IGCT-based direct current network voltage sudden change testing device comprises an auxiliary power source, a controller, an IGCT switch unit and a network voltage sudden change resistor, the auxiliary power source and the drive power source end of the IGCT switch unit are connected, the controller is connected with the drive control end of the IGCT switch unit, the IGCT switch unit, a tested load converter and a power supply of the tested load converter are connected in series to form a loop, the IGCT switch unit and the network voltage sudden change resistor are connected in parallel, and the IGCT switch unit is composed of at least one IGCT device. The application method comprises the step that the IGCT switch unit is controlled to be switched on or switched off according to test requirements, so that network voltage of the load converter is increased suddenly or decreased suddenly. The IGCT-based direct current network voltage sudden change testing device and the application method have the advantages that switching on and switching off are not affected by current in a circuit, the sudden change time is accurate, various network voltage sudden change situations are simulated accurately, and safety and reliability are good.

Description

technical field [0001] The invention relates to a sudden change test device for an urban rail converter, in particular to an IGCT-based DC network voltage sudden change test device and an application method thereof. Background technique [0002] In the test of the urban rail converter, it is necessary to simulate the working condition of the sudden change of the voltage of the power supply DC grid (power supply), for example, the voltage of the urban rail converter power supply DC grid suddenly decreases (or increases), after 1ms to 1000ms DC grid voltage returns to normal. The existing technology is to use the DC contactor to realize the switching of the network voltage sudden change line, but the opening and closing time of the DC contactor is long (10ms level), and the opening and closing time of the DC contactor will also be affected by the current in the line. It is difficult to control the grid voltage interruption time of the grid voltage interruption test. Content...

AI Technical Summary

Problems solved by technology

The existing technology is to use the DC contactor to realize the switching of the network voltage sudden change line, but the opening and closing time of the DC contactor is long (10ms level), and the opening and closing time of the DC contactor will also be affected by the current in the line. It is difficult to control the network pressure interruption time of the network pressure interruption test

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