Method for thermal power unit load prediction PID control based on Laguerre function model

Abstract

The invention discloses a method for thermal power unit load prediction PID control based on a Laguerre function model. The thermal power unit load system comprises a control system and a controlled system. The specific operation steps are as follows: S1, the control output U(k) of the control system is input into the controlled system to obtain the controlled output Y(k); S2, the Laguerre function prediction model parameter identification is performed by using Y(k); S3, the control output U(k) is transmitted as a model and is input into the Laguerre function prediction model to obtain the model prediction output Y(i)M( / i)(k+1); S4, the model prediction output Y(i)M( / i)(k+1) is feedbacked and corrected by Y(k) to obtain the compensation model prediction output Y(i)P( / i)(k+1); S5, the compensation model output is scrolled and optimized by using the PID control algorithm to obtain a new control output U(k+1); and S6, the steps S1 to S5 is repeated to realize the stable operation of the thermal power unit load system. According to the method for thermal power unit load prediction PID control based on a Laguerre function model, the invention has the advantages of fast tracking speed, strong anti-interference ability, small steady-state error, short calculation time and the like, and has strong adaptive capability.

Description

technical field [0001] The invention belongs to the technical field of load control of thermal power unit units, and mainly relates to a load prediction PID control method for thermal power unit units based on a Laguerre function model. Background technique [0002] With the continuous expansion of the capacity of the power grid and unit units, the requirements of users on the quality of power consumption are also increasing, and it is becoming more and more important to study the application of multivariable control strategies in thermal processes. Thermal power plant unit load control is a typical complex multi-variable system. The main requirement of thermal power unit load control is to keep the main steam pressure within a specified range and to make the unit quickly meet the external load demand. [0003] At present, experts have proposed some advanced control strategies for unit load control of thermal power plants. For example, Li Yiguo et al. proposed a kind of fuzz...

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