DEH of double reheat steam turbine modeling and analysis
ZHU Chaoyang1, LIAO Jinlong2, LI Wei2, CHENG Jianhong2, SHENG Deren2
（1.Fengtai Power units of Huaizhe coal and electricity Co., Ltd., AnHui province, Huainan 232131, China; 2.Institute of Thermal Science and Power System, Zhejiang University, Hangzhou 310027, China）

Abstract: Aiming at modeling DEH of double reheat steam turbine to study its controlling technology of double reheat steam turbine, the theory of DEH was analyzed and simulation was conducted. The structure difference between double reheat steam turbine and reheat steam turbine and the characteristics were introduced.The control scheme of double reheat turbine and starting method were analyzed and its dynamic characteristics of double reheat steam turbine was researched especially. Cylinder power, servo system, PID regulator etc. in DEH of double reheat steam turbine were modeled. SIMULINK was used to simulate the model combined with supercritical (ultrasupercritical) unit operation parameters. The results showed the actual value follow the given value well and the actual value curve was almost completely coincided with the given value curve. The results indicate that the model of DEH of double reheat steam turbine is viable.
Key words: steam turbine; double reheat; DEH; modeling