Study of two-cell immune feedback control for water level of boiler drum based on gray prediction
Due to the ‘false water level’ phenomenon in power station makes the traditional control strategy can't be a good solution to the problem, a two-cell immune feedback control strategy based on gray prediction for water level of boiler drum in power station is proposed, which using the function of gray prediction with strong self-adaptability and advanced control functions, and learning from bio-feedback mechanism of the immune system and regulating rule of response process. Through lots of simulation studies, it can achieve a more satisfied control quality with strong robustness and anti-jamming capability. Meanwhile, the structure and algorithm of the control strategy are simple and easy to engineering implementation.
Main steam pressure control system based on two-cell immune mechanism in power plant
The main steam pressure control system in power plant is adjusted by the variation of the fuel quantity and give-wind. It is a large inertia, long time-delay system relative to the variation of fuel. Conventional PID cascade control system canpsilat obtain satisfied control performance due to the time-delay characteristic of main steam pressure system which is incarnated mainly on the steam-water system. Biology immune system has strong robustness and self-adaptability even when encountering a great deal of disturbances and uncertain conditions. Aiming at the large inertia and long time-delay characteristics of the main steam pressure system and prompted by the two-cell immune feedback mechanism model of biology system, a new control strategy of the main steam pressure control system based on two-cell immune feedback mechanism which uses the furnace radiant energy as middle adjustment signal is presented in this paper. Simulation results show that the control strategy can achieve satisfied control performance and has strong robustness, self-adaptability and disturbance rejection ability.
Ground Fault Protection for Electric Utility Generating Station Medium Voltage Auxiliary Power Systems
Most generating station designs have medium voltage auxiliary power systems with low resistance grounded neutrals.1 In order to provide even higher reliability, the auxiliary power distribution system configurations supply increasingly redundant process equipment.