Model-based dynamically decoupling turbine-boiler coordination control method for thermal power unit

Abstract

The present invention discloses a turbine-boiler coordination control method for thermal power unit. The problems of object hysteresis and coupling of systems exist in the current turbine-boiler coordination control. The technical scheme of the present invention is: firstly, by means of an advanced estimation about coal amount, overcoming the combustion hysteresis so as to improve the response rate of the load; secondly, according to the unit model, designing a reasonable pressure setting curve to make coal amount in accordance with an adjustment valve so as to realize a dynamic decoupling and make a coordination control system of the unit fully utilize the thermal storage capability of the unit and track the desired value rapidly and accurately; thirdly, reasonably adjusting a PID controller parameter in a stable state to guarantee the stabilization of the load and main steam pressure. The model-based dynamically decoupling turbine-boiler coordination control method for thermal power unit provided by the present invention is advantageous in overcoming coal combustion hysteresis, improving the response rate of the load, realizing the objective of dynamic decoupling and making the adjustment valve control the pressure meanwhile guaranteeing the response quality of the load.

Description

technical field [0001] The invention relates to a coordinated control method for a furnace of a thermal power generating set. Background technique [0002] At present, most large-scale thermal power units need deep peak-shaving operation, and the quality requirements for the coordinated control of the units are also increasing. It is difficult to achieve fast and accurate dynamic follow-up with conventional control methods, and the quality of AGC operation is not ideal; at the same time, due to the coupling of the coordinated control system When the load response is accelerated, the main steam pressure will fluctuate violently, thus affecting the stable operation of the coordinated control system. Therefore, there are object lag problems and system coupling problems in the current unit coordination control. Contents of the invention [0003] The technical problem to be solved by the present invention is to overcome the above-mentioned defects in the prior art, and provide...

AI Technical Summary

Problems solved by technology

[0002] At present, most large-scale thermal power units need deep peak-shaving operation, and the quality requirements for the coordinated control of the units are also increasing. It is difficult to achieve fast and accurate dynamic follow-up with conventional control methods, and the quality of AGC operation is not ideal; at the same time, due to the coupling of the coordinated control system When the load response is accelerated, the main steam pressure will fluctuate violently, thus affecting the stable operation of the coordinated control system

Therefore, there are object lag problems and system coupling problems in the current unit coordinated control.

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