A control method and system combining the segmented open-loop control of the guide vane opening and the variable-parameter PID closed-loop control of the governor

Abstract

A control method and system combining segmental open-loop control of the guide vane opening analog quantity of a monitoring system of a hydropower station and a PID closed-loop control of a governor. The method is based on a data table corresponding to water head, active power and guide vane opening. , the monitoring system adopts the method of checking the corresponding data table and segmented open-loop control, and outputs the analog control signal of the guide vane opening; the speed regulating system adopts the PID closed-loop control mode, and outputs the control signal of the hydraulic servo system. The brand-new method of fast and precise power adjustment aims to solve the problem of adopting the power closed-loop conventional pulse adjustment method in the opening mode, the active power adjustment speed is slow, the adjustment process is easily affected by the water hammer reaction and the inertia of the unit, and the pure open-loop control method Under the circumstances, there is a deviation in the data table corresponding to the water head, active power and guide vane opening, which leads to static deviation in the opening control, and at the same time suppresses the excessive adjustment speed to cause serious overshooting.

Description

The segmented open-loop control of the guide vane opening and the variable-parameter PID closed-loop control of the governor Combined control method and system technical field The invention belongs to the field of computer monitoring system of hydropower station, be specifically related to a kind of guide vane opening degree of monitoring system of hydropower station A control method and system combining analog subsection open-loop control and variable-parameter PID closed-loop control of a governor. Background technique At present, in the operation process of the hydro-generator set, the monitoring system usually adopts the power closed-loop conventional pulse under the opening mode. Through the intermediate relay, the pulse of opening increase and decrease is output to the electronic control system of the governor, so as to realize the control of the water turbine to generate electricity. Unit opening control. For details of the control method, please refer to the...

AI Technical Summary

Problems solved by technology

[0003] In order to solve the above-mentioned technical problems, the present invention provides a control method and system that combines segmental open-loop control of the guide vane opening analog value of the hydropower station monitoring system and PID closed-loop control with variable parameters of the governor. Conventional pulse adjustment mode, the active power adjustment speed is slow, the adjustment process is easily affected by the water hammer reaction and the inertia of the unit, and under the pure open-loop control mode, the water head, active power and the guide vane opening corresponding data table have deviations, resulting in opening Control problems such as static deviation; at the same time, suppress the serious overshoot phenomenon caused by too fast adjustment speed, improve the performance and quality of the small or terminal adjustment of the guide vane opening and active power of the unit, and realize the rapid adjustment of the guide vane opening and active power of the unit Precise and stable real-time control to improve adjustment quality

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