Research On Dsp-based Excita Tion Controller

Excitation controller, 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 excitation controller will become the main stream of excitation controllers in the future. Constant improvement in excitation control method set an even higher requirement for the computation of the microcomputer-based excitation controller According to this requirement, the paper studies the DSP-based excitation controller by using DSP (Digital Signal Processor) as the control center. Firstly, this paper introduces the developing tendency of excitation controller, including the development of hardware and control method, microcomputer-based excitation controller hardware structure and requirement of excitation control method to hardware Secondly, this paper also introduces the development, feature and application range of DSP and illustrates DSP performance advantage compared with the other singlechips or general-purpose processors Finally, this paper deals with the design of the DSP-based excitation controller 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, signal synchronizing and human-machine interface The DSP-based excitation controller 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 excitation controller's structure is simpler, its performance is reliable and its operation convenient. The DSP-based excitation controller has been tested on the generator in the laboratory. Results 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.