Research On DsPIC-Based Intelligent Thyristor Converter

Thyristor converter, as a main part of excitation system, is very important to the safe and steady operation of power systems.With the development of large-scale integrate circuit technology and computer technology, microcomputer-based thyoristor converter will become the main stream of thyristor converter in the future. Constant improvement in excitation control method set an even higher requirement for the computation of the microcomputer-based thyristor converter. According to this requirement, the paper studies the DSC-based thyristor converter by using DSC (Digital Signal Controller) as the control center.Firstly, this paper introduces the developing tendency of thyristor converter, including the development of hardware and control method, microcomputer-based thyristor converter's hardware structure and requirement of modern technology to hardware. Secondly, this paper also introduces the development, feature and application range of DSC and illustrates DSC's performance advantage compared with the other singlechips or general-purpose processors .Finally, this paper deals with the design of the DSC-based thyristor converter 's hardware and the flowchart and realization method of its software from the aspects of I/O channel, formation and phase-shifting of the trigger pulse,loading sharing, signal synchronizing and human-machine interface. The DSC-based thyristor converter adopts many advanced technologies, such as alternating current sampling, digital pulse and graphic LCD displaying etc. Because of the adoption of these advanced technologies, the thyristor converter's structure is simpler, its performance is reliable and its operation convenient.The DSC-based excitation controller has been tested on the generator in the laboratory. Result of the test shows that all functions of the excitation controller are efficient and some are even better than the other microcomputer-based excitation controllers.