The invention belongs to the technical field of oil and gas
field development, and discloses a
crude oil treatment inlet liquid steady flow control method based on fuzzy
cascade PID, which comprises the following steps: determining fuzzy
cascade PID regulation
loop control logic of an
inner loop control loop and an outer
loop control loop, the input and output of the outer
loop control loop are respectively a pressure
buffer tank target liquid level and an
inlet pressure buffer tank flow control
valve opening; the input and the output of the inner ring control loop are respectively the opening degree of a flow control valve of an
inlet pressure buffer tank and the opening degree of a gulp valve; determining initial domains of discourse of input and output parameters of a
fuzzy inference engine, and performing fuzzification
processing; determining
fuzzy rule tables of the inner and outer ring
fuzzy inference engines; the target liquid level of the pressure buffer tank serves as loop input, initial parameters of an inner ring
PID controller and an outer ring
PID controller are determined, the parameters are continuously optimized under the action of a
fuzzy inference engine, and steady flow control is achieved. The stability of
crude oil liquid
inlet flow can be greatly improved, the
processing capacity of a process rear-end device is met, and light-load operation of the pressure buffer tank is guaranteed.