Performance Evaluation of Main Steam Temperature Control System of Thermal Power Unit Based on Mahalanobis Distance

As the main parameter of thermal power unit, the measurement and control of main steam temperature play an important role in the safe and economic operation of power plant. In order to improve the control quality of main steam temperature control system of thermal power unit, this paper presents a performance evaluation method of main steam temperature control system of thermal power unit based on Mahalanobis distance. This method is based on the output data of leading steam temperature and main steam temperature. Firstly, the data set representing the best performance of the system is selected according to Hurst index, and the benchmark of performance evaluation is established based on this data. Then the calculation process of traditional Mahalanobis distance is improved, and the specific calculation method of performance evaluation index based on the combination of Hurst index and improved Mahalanobis distance is given. Finally, the performance evaluation index is classified by membership function. The simulation results show that the evaluation method is effective and reasonable and the calculation is simple.