Thermal power generating unit main steam pressure control method and system based on three-stage control series connection

Abstract

The invention discloses a thermal power generating unit main steam pressure control method and system based on three-stage control series connection, and the method comprises the steps: designing a three-stage controller series connection structure, wherein the three-stage controller series connection structure comprises a multi-model prediction controller, a boiler master controller and a fuel master controller which are sequentially connected in series; setting parameters of boiler master control and fuel master control in the three-stage controller series connection structure; and designing model prediction controllers under multiple working conditions, summing the outputs of the model prediction controllers under the multiple working conditions and then performing accumulating, and taking the accumulated output as the overall output of the multi-model prediction controller. According to the method and system, the main steam pressure control response speed can be improved, the main steam pressure dynamic deviation can be reduced, the automatic power generation control stability can be improved, the fuel quantity can be rapidly adjusted during load changing, and therefore the main steam pressure response speed is increased, and the dynamic deviation is reduced.

Description

technical field [0001] The invention belongs to the technical field of thermal control of thermal power units, and in particular relates to a method and system for controlling main steam pressure of thermal power units based on three-stage control in series. Background technique [0002] The main steam pressure control characteristics of thermal power units have control difficulties such as large time delay, large inertia, and nonlinearity. The response speed of the steam pressure control method is slow, and the dynamic deviation of the main steam pressure is large, which not only affects the safe and stable operation of the unit itself, but also limits the potential of the unit for rapid load change. [0003] At present, the main steam pressure control of conventional thermal power units is completed by the cooperation of the boiler main control and the fuel main control in the coordinated control system (the control block diagram is attached figure 1 shown). Generally sp...

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Problems solved by technology

Practical application shows that due to the poor applicability of PID control to the control characteristics of main steam pressure with large time delay and large time delay, the problems of slow response speed and large dynamic deviation of main steam pressure in the above conventional thermal power unit main steam pressure control methods are difficult to solve Solve the problem by optimizing and adjusting the control parameters of the main steam pressure control method of conventional thermal power units

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