Coal-fired unit drum boiler water level control method capable of improving dynamic property based on neural network

Abstract

The invention discloses a coal-fired unit drum boiler water level control method capable of improving a dynamic property based on a neural network. The method comprises the following steps of buildinga state space model, designing an output conversion function, carrying out output conversion, defining a filtering error, enabling a filtering error derivative to be a zero design ideal controller, using the neural network to approach to a part, containing an unknown quantity, in the ideal controller, and designing an actual controller. For an unknown structure and unknown parameters in the model, the neural network is used for approaching to the unknown dynamic condition. In addition, according to the safety production needs of a power station, in order to prevent a steam pocket from being too hot or prevent steam from flowing out, and improve the control effect on the drum boiler water level, the control method considers the output limit condition, the nondeterminacy in an existing model can be overcome, the anti-interference capacity can be achieved, the system transient output is kept within the preset boundary layer, it is ensured that the overshoot is not too large, and the control effect can be improved as much as possible while safety production is ensured.

Description

technical field [0001] The invention belongs to the field of control, in particular to a method for controlling the water level of a drum boiler of a coal-fired unit based on a neural network to improve dynamic performance. 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 control coal-f...

AI Technical Summary

Problems solved by technology

For the water level control of the drum boiler, many scholars have made various types of improvements to the PID control method, and achieved certain results, but the accuracy achieved is not high, and there is no theoretical basis

However, due to the limitation of modeling technology, the existing models have uncertainty and dynamic modeling, which makes the control difficult; at the same time, the water level fluctuates greatly and the convergence speed is slow, which seriously affects the control effect. Therefore, it is necessary to eliminate the unbuilt Mode dynamics while improving transient performance

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