Abstract
The high pressure (HP) heater system is an important part of the circulating water treatment system in the power generating units, whose role is to extract the steam with high temperature and high pressure exhausted from the turbine to heat the water supply of desecrator. A mathematical model of the HP heater system is established so as to obtain the system transfer function matrix. Then in order to eliminate the multi-variable coupling in HP heater system, three decoupling methods (diagonal matrix decoupling, integral decoupling and feed-forward compensator decoupling) are used to make the coupling system decoupled into two single-input-single-output (SISO) systems. Finally simulation experiments are carried out to verify the effectiveness of the proposed mathematical model and decoupling methods.
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