The Design And Realization Of Synchronous Generator Excitation System Simulation & Testing Device Based On Master-Slave DSPs Architecture

Excitation control of synchronous generator plays an important role in improving safety and stability of generator unit and even power system nowadays. Thus, it is necessary to do static and dynamic characteristic tests of an excitation regulator comprehensively in the stage of design,manufacture,commissioning and maintenance, achieving the satisfactory regulation performance by a economical and effective way. On the other hand, the limitation of traditional testing in industrial field and dynamic physical simulation testing makes it hard to satisfy test requirements of modern excitation regulator. With the development of computer technology, automation technology and digital simulation of power system, excitation regulator testing means gradually develop to real-time digital simulation testing. It is convenient and effective to carry out closed loop test by testing technology base on real-time digital simulation; which is greatly significant both for engineering applications and theoretical studies.In this paper, a design scheme of a digital simulation testing device used in excitation system base on master-slave DSPs architecture will be presented, on the basis of digital simulation study of excitation control system. The testing device and excitation regulator can compose closed loop control through hardware interface, conducting the static and dynamic characteristic tests for excitation equipment by means of real-time digital simulation, so that it can satisfy test requirements of modern excitation regulator in the process of production and overhaul.The paper firstly builds the simulation models base on single machine infinite bus system through the analysis of synchronous generator excitation control system, focuses on comparing a variety of model solving algorithms, and conducts a preliminary off-line simulation to verify the validity of the model; Secondly, a general design scheme of simulation test instrument for excitation system base on master-slave DSPs architecture is presented, with a detailed analysis of the technical conditions for real-time digital simulation testing and the interface between the simulation testing device and the excitation regulator. Meanwhile the feasibility and necessity of this master-slave DSPs architecture is expounded. In the detailed design section, hardware design of the simulation testing device is analyzed firstly, focusing on the peripheral circuit of the dual-DSP and their mutual communication design, USB communication interface design, extended design of ADC and DAC, and so on. Then key technologies in the system software design are researched, including DAC data generating algorithm, SCR trigger angle measurement, etc, and the solutions are given; Program design processes of master and slave DSPs are described; Software design in the USB communication is also discussed. Finally, the paper summarizes the results of the research, proposes some issues to be improved in the system design and realization, and puts forward the prospect of the further study.