Research On Excitation Controller Of Synchronous Generator Based On DSP

The excitation controller is a significant part of excitation system of synchronous generator,which is important to keep security and stability of power system. Ecellent excitation system can not only ensure the rebliability of generator, the good quality of generators' supply, but also enhance the steady stability and transient stability of power system effectively.Based on the actuality and development trend of excitation system in home and aborad, useing new type DSP, TMS320F2812, special for generator controlling, an excitation controller is designed with high integration in hardware, hige speed operation in software, and strong whole function. When designing the hardware, the plenty peripherals of chip TMS320F2812 are used fully. Moreover, the adaptive sync signal capture module with high reliability, the multichannel AC signal synchronized sampling module and the phase shift trigger generator module are conformed to the integration. When designing the software, the program, stryctured, modularized, top–down and refined step by step, is followed. So, the frequency measurement module with high readability, data sampling module, the phase shift trigger generator module and varied excitation limiting modules are designed. And the modules are embedded seamlessly in the macro software frame.Based on the new type DSP, TMS320F2812, special for generator controlling, the excitation controller is dedigned with little volume and high speed. In order to solve the problem of multi-channel analog signals synchronized AC sampling in electric machine control, the hardware phase-lock loop and the 16-bit, 6-channel, parallel AD convert are presented. So, the calculated value of power and power factor are ensured effectively to be more close to their real. A new technology of rapid pulse train triggering is used to improve the trigger pulse gradient and reduce the requirement of pulse transformers. The fuzzy PID control technique is adapted, so that the excitation controller has the merits of PID adjustment and fuzzy adjustment, and the dynamic performance of excitation system of synchronous generator is improved. Besides, the least system module of DSP has the extend interface which can be compatible to different voltage level, and the software is designed by modular programming, therefore the excitation controller can hold new functions continuously.The test shows that the designed hardware and software can fit well, and the anticipative design objectives are attained.