Close-link energy control method and system for main steam pressure of thermal power unit

Abstract

The invention relates to a main steam pressure closed loop energy-saving control method and system for a thermal power generating unit. The method comprises the steps of acquiring the main steam pressure set value, unit load command, turbine master command and CCS mode value of the thermal power generating unit at the current acquisition moment; acquiring the target value of the turbine governing valve opening degree under the unit load command according to a preset load command and turbine governing valve opening degree relation curve through calculation; acquiring the input deviation at the current acquisition moment according to the turbine master command and the target value of the turbine governing valve opening degree; substituting the input deviation at the current acquisition moment, the input deviation at the last acquisition moment and the CCS mode value into a preset integral model to calculate the main steam pressure offset value; conducting superposition on the main steam pressure offset value and the main steam pressure set value to generate the main steam pressure set output value. By the adoption of the method and system, best match between the initial steam pressure and steam flow of a turbine can be accurately controlled, so that an ideal energy-saving effect is realized.

Description

【Technical field】 [0001] The invention relates to the field of thermal power engineering and automatic control, in particular to a closed-link energy control method and system for the main steam pressure of a thermal power unit. 【Background technique】 [0002] The sliding pressure operation mode of large thermal power units is of universal significance to reduce heat consumption, energy saving and emission reduction, and the setting of sliding pressure curve is very important to the energy saving and consumption reduction of the unit. The optimization of the sliding pressure curve can generally be carried out by two methods: experimental measurement and loss analysis. The loss analysis method draws a conclusion through the analysis of the important parameters that affect the economy under different sliding pressure methods, ignoring the Due to some secondary factors, the error will inevitably be larger. However, the difference in heat consumption rate of power generation un...

AI Technical Summary

Problems solved by technology

[0004] Based on this, it is necessary to provide a closed-loop energy control method for the main steam pressure of thermal power units to solve the problem that the fixed sliding pressure curve in the prior art cannot adapt to the changes in the working conditions of thermal power units, so as to realize the thermal power units under various working conditions. It can accurately optimize and adjust the sliding pressure curve, so that the thermal power unit can always keep running under the best main steam pressure, realize the matching of the inlet steam pressure and the inlet steam volume of the steam turbine, and achieve the ideal energy-saving effect

Images