Anti-interference prediction control method of combined heat and power system of micro gas turbine
A micro gas turbine and combined heat and power technology, applied in the direction of self-adaptive control, comprehensive factory control, general control system, etc., can solve problems such as the inability to consider control constraints, the inability to guarantee the stability of the closed-loop system, and the inability to meet performance requirements
Active Publication Date: 2020-08-28
SOUTHEAST UNIV
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Problems solved by technology
However, because the dynamics of micro gas turbine cogeneration systems have complex characteristics such as large thermal inertia, strong multivariable coupling, input constraints, nonlinearity, and unknown disturbances, the PID method has been unable to meet the performance requirements.
The existing predictive control system of the micro gas turbine combined heat and power system cannot guarantee the stability of the closed-loop system; and the existing control method of the micro gas turbine combined heat and power system cannot consider the control quantity constraints in the controller design stage, and cannot simultaneously adjust the thermal Load and Electrical Load
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[0066] The technical solution of the present invention will be further described below in conjunction with the accompanying drawings and specific embodiments.
[0067] Micro gas turbine combined heat and power system is a two-input and two-output system, its input quantity includes fuel quantity u 1 and the opening of the primary water bypass valve u 2 , the output includes the micro-turbine speed y 1 and secondary water supply temperature y 2 . The speed of the micro gas turbine is only affected by the amount of fuel, and the temperature of the secondary water supply is also affected by the amount of fuel and the opening of the primary water bypass valve. Therefore, according to its specific physical structure, it can be divided into a speed system and a temperature system.
[0068] Such as figure 1 As shown, a kind of anti-disturbance predictive control method of micro gas turbine combined heat and power system of the present invention comprises the following steps:
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The invention discloses an anti-interference prediction control method for a combined heat and power system of a micro gas turbine, wherein the method comprises the steps: collecting the operation data of the combined heat and power system of the micro gas turbine, recognizing state space models of a rotating speed system and a temperature system, and establishing an overall control model of the combined heat and power system; establishing a generalized amplification state observer based on the overall control model of the combined heat and power system; establishing a prediction model of stable prediction control based on the generalized amplification state observer; establishing a stable prediction controller, adjusting the fuel quantity and the opening degree of a primary water bypass valve, and controlling the rotating speed and the secondary water supply temperature. According to the invention, system nonlinearity, model mismatch and disturbance are integrated into one disturbance; a generalized amplification state observer is used for estimating lumped disturbance and state quantity, a prediction model is obtained through feedforward compensation, then a stable prediction controller is designed, the anti-interference performance of the system is effectively improved while the stability of the system is guaranteed, and the method has the advantages of being high in tracking speed, small in overshoot and high in anti-model mismatch and anti-interference capacity.
Description
technical field [0001] The invention relates to the control technology of a micro gas turbine combined heat and power system, in particular to an anti-disturbance prediction control method for a micro gas turbine combined heat and power system. Background technique [0002] Compared with the traditional centralized energy supply system, the distributed energy system can directly provide various forms of energy to the user at the user end, and realize the cascade utilization of energy. Micro gas turbine combined heat and power (MGT-CHP) system is an important form of distributed energy, which has the characteristics of cleanliness, high efficiency and flexible structure. However, due to the complex characteristics of the dynamics of the micro gas turbine combined heat and power system, such as large thermal inertia, strong coupling of multiple variables, input constraints, nonlinearity and unknown disturbances, the PID method has been unable to meet the performance requiremen...
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Login to View More IPC IPC(8): G05B13/04
CPCG05B13/042Y02P90/02
Inventor 潘蕾陈琛周娣沈炯张俊礼刘西陲
Owner SOUTHEAST UNIV