Global sliding mode control-based subcritical thermal power unit coordination control method

Abstract

The invention provides a global sliding mode control-based subcritical thermal power unit coordination control method, which comprises the following steps: selecting a subcritical boiler-turbine system nonlinear control model applicable to running under variable working conditions, and identifying a model parameter according to practical historical running data of a DCS (distributed control system) of a unit, a boiler-turbine system referring to the subcritical boiler-turbine system nonlinear model; performing decoupling and global linearization on the nonlinear control model by adopting an accurate feedback linearization method, and performing input transformation to obtain a quasilinear model of the boiler-turbine system; constructing a time-varying second-order sliding mode function for the quasilinear model, and designing a global sliding mode control law; designing an augmented observer for the quasilinear model, estimating external interference, and adding interference compensation into a controller; constructing an optimization problem to solve an optimal controller parameter by taking a minimum tracking error integral as a target function. According to the method, the rapid tracking performance and the robustness of a coordination control system are improved, and a technical support is provided for ensuring safe and economical running of the unit.

Description

technical field [0001] The invention relates to a subcritical thermal power unit coordinated control method in the field of thermal power generation control, in particular to a unit coordinated control method based on accurate feedback linearization, global sliding mode control and augmented observer. Background technique [0002] With the increasing complexity of my country's power grid and the diversification of power demand, higher and higher requirements are put forward for load and frequency regulation. For thermal power plants, the coordinated control system is an important factor affecting the safe and economical operation of the unit. Improving the quality of the coordinated control system can not only speed up the load response, but also prolong the life of the equipment and reduce the frequency of equipment maintenance. [0003] For subcritical thermal power units, the goal of coordinated control is to realize the fast tracking of the power generation to the load c...

AI Technical Summary

Problems solved by technology

However, there are deficiencies in the coordinated control of the traditional machine furnace, which is reflected in the large fluctuation of the main steam pressure and is easily affected by external disturbances (see figure 2 )

Therefore, neither the existing patented technology nor the traditional coordinated control of the furnace can meet the requirements of the rapidity, stability and robustness of the coordinated control system at the same time.

Images