Dynamic performance of molten salt electric heater with AGC regulation for auxiliary coal-fired units
The coupling of coal-fired units with molten salt electric heater systems can significantly improve their frequency regulation and peak shaving capabilities.On the basis of Modelica language,a dynamic model of the molten salt electric heater is established and the experimental verification is completed,it reveals the dynamic characteristics of the molten salt electric heater under the disturbance of molten salt flow rate and unit AGC load.A temperature control method of"feedforward+PID"regulation is proposed based on its dynamic characteristics,and the characteristics of electrical load and thermal parameter changes during AGC regulation of coal-fired units assisted by molten salt electric heaters are calculated and analyzed.The results indicate that,configuring a 10 MW molten salt electric heater can increase the AGC variable load rate of a 660 MW coal-fired unit by 340％,and the proposed control method can maintain the stability of thermal parameters of the electric heater.
coal-fired unitmolten salt heat storageelectric heaterdynamic characteristicsAGC regulation
万方数据
维普
