A Remote Fault Diagnosis System for Power Unit of High Voltage Frequency Converter

Abstract

The invention belongs to the technical field of power electronic diagnosis and discloses a high voltage frequency converter power unit remote fault diagnosis method. The system comprises a field acquisition system for sending collected test data to a background diagnosis system and receiving the fault information of a failed system obtained by a background diagnosis system according to the test data diagnosis, a data transmission system used for realizing the data exchange between the field acquisition system and the background diagnosis system, the background diagnosis system for carrying out processing and diagnosis according to the test data and then obtaining the fault information of the failed system, and sending the fault information to the field acquisition system, wherein the failed system is a failed power unit in the chain structure high voltage inverter. According to the system, the remote diagnosis can be realized, the background diagnosis system can be fully used, a field problem is rapidly analyzed and on-site equipment maintenance is guided, the time and cost of the equipment maintenance are saved, the sharing of resources is realized, and the utilization rate of the resources is improved.

Description

technical field [0001] The invention belongs to the technical field of power electronics diagnosis, and more specifically relates to a remote fault diagnosis system for a power unit of a high-voltage frequency converter. Background technique [0002] Unit cascaded high-voltage inverters, such as figure 1 As shown, the three-phase output voltages U, V, and W are respectively obtained by superimposing the output voltages of multiple internal low-voltage power units Unit 1 to Unit N in series; since the potentials of the power units of the high-voltage inverter after series connection are accumulated to form a high potential, Ordinary testing equipment cannot achieve safe electrical isolation, and engineers cannot test and monitor its operation online, which brings a lot of inconvenience to the on-site testing of equipment. Therefore, the existing technology adopts the method of performing online test on each power unit separately, which mainly includes a single power unit low...

Images