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.
关键词
燃煤机组/熔盐储热/电加热器/动态特性/AGC调节
Key words
coal-fired unit/molten salt heat storage/electric heater/dynamic characteristics/AGC regulation
维普
万方数据