A State Observer Based Predictive Control Method for Combined Cooling, Heating and Power System

Abstract

The invention discloses a combined cooling heating and power supply system prediction control method based on a state observer. The combined cooling heating and power supply system prediction control method comprises the steps of: S1, acquiring a step response model of a miniature gas turbine combined cooling heating and power supply object; S2, determining a state-space model of the combined supply object; S3, setting parameters of the controller, and predicting a future state of the combined supply system; S4, initializing the controller; S5, calculating deviations; S6, correcting state quantity online; S7, predicting future output; S8, calculating an optimal control increment for fuel quantity, a backheating valve opening degree and a high-pressure refrigerant steam valve opening degree at the next moment; S9, calculating an optimal control quantity for fuel quantity, a backheating valve opening degree and a high-pressure refrigerant steam valve opening degree at the next moment; S10, outputting the optimal control quantity, and calculating and updating an output prediction value at the next moment according to measurement signals; and carrying out the steps S5-S10 repeatedly in each sampling period. The combined cooling heating and power supply system prediction control method can improve the control quality.

Description

technical field [0001] The invention relates to the field of thermal automatic control, in particular to a state observer-based predictive control method for a combined cooling, heating and power supply system. Background technique [0002] Cogeneration of cooling, heating and power is an important plan and measure to realize cascade utilization of energy and improve the utilization rate of primary energy. The combined cooling, heating and power system powered by micro gas turbines has gradually become one of the development trends of current world energy technology due to its advantages of high energy utilization efficiency, low emission, distributed, safety and easy adjustment. [0003] Scholars at home and abroad have done a lot of research work on the operation optimization and modeling of the cogeneration system, but the research on the control strategy is insufficient. Furthermore, due to the large inertia and delay of the cogeneration system, it is difficult to desig...

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Problems solved by technology

[0003] Scholars at home and abroad have done a lot of research work on the operation optimization and modeling of the cogeneration system, but the research on the control strategy is insufficient.

Furthermore, due to the large inertia and delay of the cogeneration system, it is difficult to design the control strategy

The joint supply system also has nonlinear characteristics of valves and other equipment and coupling characteristics of upstream and downstream loops, which makes it difficult for traditional control methods to achieve satisfactory control effects

At the same time, it is difficult to obtain good control quality due to disturbance, measurement noise, and uncertainty that have a certain interference effect on the controller.

The conventional PID control scheme commonly used at present is difficult to effectively deal with the large delay and strong coupling characteristics of the controlled object

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