Design And Application Of Low Voltage Test&Control System For Traction Converter

Zhuzhou CSR Electric Co., Ltd began cooperation with some foreign company on High-Speed EMU project in2006, and is mainly responsible for manufacturing and assembly of CI, APU, MON units and so on. From2007to2009, the imported manual testing has been major test method adopted in CI products routine test, serving all200km/h CI products during that period.Starting form2008, product yield keeps rising, and test efficiency is desired to improve as much as possible to meet production requirement, higher efficiency and shorter manufacturing cycle. A new test program is needed to replace the existing manual test while ensuring test reliability and stability. The development of virtual instrument technology and the application of GPIB and PCI control bus provide hardware infrastructure for automatic test bench; the popularity of Lab VIEW secondary development software at home and abroad also provides a simple and efficient software platform for test systems development.This article firstly introduces international development and application status of low-voltage test system, and described the purpose and significance of the development of low-voltage test system for traction converter control unit.Secondly, it introduces the working principle of current high-speed EMU traction converter, describes the key role of DCU (traction inverter control unit) in traction converters, and analyzes the necessity of relevant test steps for effect verification.Then, comparative analysis is delivered according to factory test requirements and test bench scalable construction demands, while combines advantages and disadvantages of various types of control bus and secondary development software. The test system development is to meet low voltage low power functional test requirements of CI in current200km/h (300km/h) EMU project, to conduct open-loop or closed-loop control combined with control program in converter under testing; to expand test instrumentation by simple supplement of resource, and ensure satisfying future requirements with necessary resources expension. Accordingly GPIB+PCI bus-based hardware platform and LabVIEW-based secondary developing are chosen.Finally, after completing design&development, installation and application, the low-voltage test system can simulate product working environment, perform reliable and overall low power converter function test, provide required test signals automatically or manually in accordance with the test procedure, determine the test results automatically or manually by comparing measured value with expection, thus complete converter products factory testwork, and as a result significantly improve test efficiency, precision and accuracy.