Digital valve flow control system and optimal control method thereof

• Main Authors: WANG YOUMIN, SUI HE, LI AKANG, XIE PENGFEI, JIANG QINSHUAI, XU XIAOJUAN
• Format: Patent
• Language: Chinese; English
• Published: 02.11.2018
• Subjects: ACTUATING-FLOATS; BLASTING; COCKS; CONTROLLING; DEVICES FOR VENTING OR AERATING; ENGINEERING ELEMENTS AND UNITS; GENERAL MEASURES FOR PRODUCING AND MAINTAINING EFFECTIVEFUNCTIONING OF MACHINES OR INSTALLATIONS; HEATING; LIGHTING; MECHANICAL ENGINEERING; PHYSICS; REGULATING; SYSTEMS FOR CONTROLLING OR REGULATING NON-ELECTRIC VARIABLES; TAPS; THERMAL INSULATION IN GENERAL; VALVES; WEAPONS

The invention discloses a digital valve flow control system and an optimal control method thereof. The system comprises a signal input device for inputting a preset value, a v-shaped ball valve, a three-phase asynchronous motor for controlling the opening degree of the v-shaped ball valve, a valve position feedback device, a frequency converter for adjusting the rotation number and the rotation direction of the three-phase asynchronous motor, an amplifier, and a PLC. The three-phase asynchronous motor is electrically connected with the frequency converter, and the frequency converter is electrically connected with the amplifier, and the valve position feedback device, the amplifier and the signal input device are all electrically connected with the PLC. The optimal control method comprisesthe steps that a transfer function of the system is established, and a state equation of the control system is worked out by the transfer function, and an optimal solution is performed on the state equation to obtain an opti