An automatic control method of heat extraction system in thermal power unit

Affected by the operation mode of “ordering power by heat”, the peak regulation shortage of combined heat and power (CHP) units in north China limits the absorption of renewable energy. To solve this problem, the improvement of heat steam extraction system control performance is essential. An automatic control method of heat extraction system is presented. The regulation of heat steam flow is realized by periodic execute pulse, and an open-loop control strategy is designed to regulate the supply water temperature of heating network. The renovation is applied to a 330MW CHP unit. The result shows the safe and reliable use of the heat steam extraction system control method, which lays the foundation of peak regulation study of CHP unit based on heat network energy storage.