Coal-fired unit drum boiler water level control method for improving transient performance based on parameter self-adaptation

Abstract

The invention discloses a coal-fired unit drum boiler water level control method for improving transient performance based on parameter self-adaptation. The method includes the following steps that atransfer function model of a known coal-fired unit drum boiler water feeding system control model is equivalently converted into a state space model, the measuring error is considered, the tracking error is defined, system transformation is carried out through the error conversion technology, a self-adaptive control law is designed for a transformed system, and the error between the water level actual value and the set value of a water feeding system is kept within the error bound preset by a user. Meanwhile, the situations that parameters are unknown and bounded disturbance exists are considered in the control method. The control method can overcome the uncertainty in existing models and enhance the robustness of the control system and has anti-disturbance capacity. In addition, by meansof the method, the transient output error of the system is kept within a preset boundary layer, it can be guaranteed that the overshoot is not too large, the control effect is improved as much as possible while safety production is guaranteed, and then the production efficiency is improved.

Description

technical field [0001] The invention belongs to the field of control and energy, in particular to a water level control method for a drum boiler of a coal-fired unit that improves transient performance based on parameter self-adaptation. Background technique [0002] As countries and organizations around the world are actively exploring new alternative energy technologies, renewable energy has been highly valued for its renewable and non-polluting characteristics. The development of new energy technology has led to the integration of various new energy sources into the grid. The energy form is no longer limited to electric energy, but a combination of various energy forms such as electric energy, natural gas energy, and petroleum energy. However, as multiple energy sources are integrated into the grid The challenges brought about increase, and the regulation ability of traditional coal-fired units needs to be improved, so it is necessary to develop better control methods to ...

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Problems solved by technology

However, due to the limitations of measurement technology, the existing measurement methods are inaccurate, which can be regarded as a disturbance, which will affect the control effect; at the same time, the water level fluctuates greatly and the convergence speed is slow, which seriously affects the control effect. Need to improve transient performance while eliminating measurement errors

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