Papers by Keyword: Sub-Module

Abstract: With the sub-module number and scale growing on, the whole control system of MMC (Modular Multilevel Converter) tends to be much more complicated because of the cascade structure, which also intensifies the pressure of the converter main controller. To distribute the converter main controller’s task, the design of sub-module tenders itself extremely important. However, there is no explicit and comprehensive study on how to design the sub-module. This study, according to the characters of MMC, introduces a feasible architecture of hardware and software for the sub-module with optical communication. Each sub-module has its own independent controller and control system. That is to say, every sub-module is a complete system, which can do calculation and communication with outside. Sub-modules connect with the main controller of converter through communication using optical fibers. By adopting the optical communication, sub-modules not only can receive the control references data from the main controller, but also can send its own condition information back, which creates an interactive communication between the two sides. Additionally, through detailed experiments, the validity and feasibility of the design are demonstrated under two different control strategies.

Abstract: At present, virtual instrument technology has been widely used in all kinds of tests, measurements and automation fields. Test software is the mainstay of virtual instrument, which plays a key role during the process of implementing test task. In order to meet the flexibility of test items and variability of parameters about industrial testing objects, this paper introduces a modular programming idea by using software of virtual instrument. This idea divides all test items into sub-modules due to different function of test items, so as to recombining some sub-modules to satisfy new requirements of different tests. This method is used in an actual software design for industrial test system, practical application shows that this software design method of modular programming is not only realize the flexibility and generality of automation test system, but also provide a good platform for the secondary development of test program.