Research And Development Of Synchronous Generator Excitation Controller Based On DSP

The modern power system exhibits the characteristics of the large-capacity generator units,UHV transmission and large-scale interconnection networks,which proposes higher and stricter requirements for power quality and system stability.Synchronous generator excitation controller plays an important role in maintaining the voltage level,providing qualified electric energy,ensuring the safe operation of the generator units and improving the technical indexes of the power system.The advanced excitation control technology and the high performance digital signal processor can be used in the modern power system comprehensively and widely to enhance the stability of the power system.This paper is aiming at researching and developing of a synchronous generator excitation controller orienting to laboratories,using TMS320F28335 DSP and integrating multiple excitation control strategy,which has simple circuit,perfect function,friendly interface,excellent performance,considerable economy,and meets the requirements for small generators in practical engineering.There is certain application value and practical meaning in this paper.This paper,firstly,sets up the research objective and illustrates the signify-cance and practical value of the subject,based on outlining excitation automatic control system,introducing and analyzing research status at home and abroad of DSP as well as the three main research directions in excitation system of the excitation mode,the control method and the controller.Secondly,not only theory research,simulation,but processing and realization in digital processor about excitation control laws of PID,PSS,and multi-index nonlinear excitation controller(MNEC)are accomplished in the single-bus infinite system.And a new improved comprehensive PID(ICPID)discretization algorithm is summarized,which has a better static and dynamic performance than the traditional PID control law.Then,through the theoretical derivation and the simulation,the relationship between control trigger angle and the output excitation voltage in the case that the thyristors in excitation power unit are in fault condition is obtained,and relevant measures are put forward,which can effectively reduce the adverse effects of the fault on the system.According to the theoretical research,this paper completes the development of excitation controller.The hardware platform of the controller is set up,after fully familiar with the DSP development system.This work includes ascertaining the overall scheme,selecting the main control chip,designing hardware schematics,simulating and testing the circuits of the core unit and the peripheral units.And then in accordance with the modular thought,the software of the controller is designed,including clearing programming idea,constructing the main program flow,and programming the functional modules.At the same time,hardware and software reliability is designed to make its function full.In addition,this paper uses the "cMT-SVR+cMT-iV5+mobile device" cloud touch screen monitoring architecture,planning the interface and implementing HMI by Modbus-RTU protocol.Finally,in the laboratory environment,with the hardware and software debugged,the performance is tested,the experiments are carried out and the correlative results are analyzed and summarized.Moreover,designing the surface of controller is propitious to make excitation controller productized in the future.The theory and practice show that the hardware and software of the designed excitation controller,whose performance meets relevant national standards and industry guidelines,can operate harmoniously and the control effect performs well,which establishes the cornerstone for the industrial products to adapt to the development of the power system and the market.