A coordinated control optimization method for deep peak shaving conditions in thermal power plants

Abstract

The invention relates to a coordinated control optimization method for deep peak regulation working conditions of a thermal power plant, comprising the following steps: 1. Converting the increased heating load of a unit in a heating period into an electrical load, and calculating a set value of sliding pressure main steam pressure; 2. Design the unit variable load feedforward according to the different valve positions of the unit steam turbine, the main steam pressure deviation and the main steam pressure change direction; 3. Set the unit load rise and fall change rates, and cancel the steam turbine starting differential during the low load stage during the deep adjustment of the unit. , The maximum variable load rate and the minimum variable load rate limit at start; 4. Increase the automatic function of the feed pump bias input of the unit, and automatically bias the output of the feed pump according to the load curve during deep adjustment; 5. Increase the water supply of the deaerator during the deep adjustment The logic of adjusting the valve opening automatically according to the unit load; 6. Automatically correct the feedforward parameter of the primary air pressure setting value when the mill starts and stops, and automatically corrects the primary air pressure setting value when the mill group starts and stops. The invention is beneficial to the safe and stable operation of the unit during deep peak regulation.

Description

technical field [0001] The invention belongs to the technical field of coordinated control of thermal power plants, and in particular relates to a coordinated control optimization method for deep peak regulation working conditions of thermal power plants. Background technique [0002] The DCS coordinated control of conventional units in thermal power plants is designed for the working conditions above 50% load, and the adaptability to low load conditions is weak. In the case of deep peak shaving of the unit under low load conditions, the unit needs to exit the AGC, exit the coordinated control, and manually adjust the boiler coal supply, air supply and other subsystems, and the operator has a large amount of operation, which is not conducive to the safety and stability of the unit during deep peak shaving run. Therefore, it is necessary to explore a coordinated control method that can be applied to low-load conditions of thermal power plants, so as to achieve "zero input an...

AI Technical Summary

Problems solved by technology

When the unit is in deep peak regulation under low load conditions, it is necessary for the unit to withdraw from AGC and coordinated control, and the subsystems such as boiler coal supply and air supply must be manually adjusted, and the operating personnel have a large amount of operations, which is not conducive to the safety and stability of the unit during deep peak regulation. run