The invention relates to the field of
hydroelectric generation automation control, discloses an intelligent flow-pressure double closed-
loop control method and
system for a water inlet
ball valve of a
water turbine, and aims to solve the technical problems that flow stability and pressure fluctuation suppression are difficult to consider, dynamic response is delayed and working condition adaptability is poor in existing single-
loop control. The method comprises the steps that
inlet pressure and flow data are collected in real time through a
pressure sensor and an ultrasonic flowmeter, a
cascade structure of outer ring flow control and inner ring
pressure control is constructed in combination with working condition parameters such as the rotating speed of a unit and the opening degree of a guide vane, and a working condition self-adaptive
weight distribution module is introduced to dynamically adjust the double-ring
gain coefficient; meanwhile, a feed-forward compensation mechanism and an optimal efficiency curve
database are fused, and dynamic matching of set values and advanced response of load instructions are achieved. The
system comprises a
data acquisition unit, a double-closed-
loop control unit, a
weight distribution unit, an electro-hydraulic
servo execution mechanism and a safety
interlocking module, and supports
microsecond-level
gain updating and high-precision valve
position control. According to the technical scheme, the adjusting precision and the response speed of the
water turbine under the complex working condition are remarkably improved, the actual measurement efficiency is improved by 2.5%-4.8%, the adjusting time is shortened to be within 3 seconds, the positioning precision reaches + / -0.5 degree, and safe and stable operation of the
system is guaranteed.