Design Of Excitation System Based On DSP

The excitation system is a significant part of synchronous generator, which is important to keep power quality, allocate appropriatly reactive power proportion and increase stability of power system. Adjustment of exciation system can improve the performannce of generator and power system. When the disturbance happens, undulation of net voltage can be quickened, the surperfluous energy of generator can be taken out and the renewal of voltage can be quickened.First, The paper provided an overview of the role of excitation system and the development of excitation system, formulated the background of the topic, presented the modern electric power system's requirements to the synchronous generator's excitation system and the development trend of excitation system. Second, I introduced the characteristics of the DSP, the selection of software and hardware for DSP, and debugging environment. Finally I focused on the overall design program of excitation system based on DSP and the main functional modules for the hardware and software design as well as the excitation control strategy.When designing the hardware, the plenty peripherals of chip TMS320F2812 were used fully. I designed the sync signal capture frequency measurement unit, the measurement-phase unit, the multichannel AC signal synchronized sampling unit, the phase shift trigger generator unit and the importing and outporting on-off value signal possessing of the optical coupler unit. According to the thought of structured modularized, top-down and refined step by step in the design of software, I empoldered the frequency tracking module, the phase measurement module, data sampling module, the phase shift trigger generator module and the secial communication module, which all have hign redablity. The 36-point fourier algorithm was mostly making use to the AC data sampling, so enharced excitation system the real-time character and the stability character. In the excitation control strategy, I mainly used the traditional PID control which is used to control the terminal voltage and excitation current.