Arithmetic Research of Performance Monitoring Models for Reheat Unit in Dynamic Procedure

Aiming at the characteristic of continuous calculation in on-line performance monitoring system of power units, this paper analyzed the dynamic property and inherent mechanism of reheat unit in load-changing procedure. In order to ensure the accuracy of the calculation, real-time arithmetic models were put forward and compared with conventional method to study the influence on performance index in dynamic procedure, including momentum equation arithmetic, Flugel arithmetic and difference arithmetic. Real-time models were applied to one 200MW reheat unit to verify and evaluate its rationality quantitatively and qualitatively. The results show that the proposed arithmetic models have superiority over conventional methods in aspects of reasonable trend and easy calculation in dynamic procedure.