Intelligent control method and device for AC submersible pump

Abstract

The invention discloses an intelligent control method and device for an AC submersible pump. The method comprises the following steps: acquiring, calibrating and obtaining multiple groups of theoretical values B and overload current values D of water shortage currents of a motor under a standard voltage; collecting a real-time voltage loaded on the motor, obtaining a real-time voltage value A, andobtaining a theoretical value of the water shortage current under the real-time voltage value A; comparing a real-time current value C with the theoretical value B of the water shortage current and the overload current D; if the real-time current value C is smaller than the theoretical value B of the water shortage current, judging that the motor is in a water shortage state; if the real-time current value C is greater than the overload current value D, judging that the motor is in an overload state, and enabling the motor to enter a forward and reverse rotation state or a forward rotation return state. The method and device can achieve the detection of the real-time current and real-time voltage of the motor in the submersible pump, and perform the discrimination of water shortage, overload, forward and reverse rotation and forward and reverse rotation recovery of the motor according to the detected real-time current value and the detected real-time voltage value.

Description

technical field [0001] The invention relates to the technical field of submersible pump control, in particular to an intelligent control method and a control device for an AC submersible pump. Background technique [0002] Due to the factors of the use environment, the voltage of the AC submersible pump varies greatly, and there will be fluctuations according to the stability of the power grid. At the same time, the voltage loss will be caused by the different lengths of the cables used. The actual low voltage of the pump works lower than or equal to the supply voltage. Due to the change of voltage, the current will also change accordingly, and the change of current will lead to problems in many intelligent judgments, among which the phenomenon of water shortage is more serious. Among them, the situation that water shortage may occur includes that the user uses normal water, and the voltage is relatively high, but the set water shortage threshold B in this state will mistak...

AI Technical Summary

Problems solved by technology

[0002] Due to the factors of the use environment, the voltage of the AC submersible pump varies greatly, and there will be fluctuations according to the stability of the power grid. At the same time, the voltage loss will be caused by the different lengths of the cables used. The actual low voltage of the pump works lower than or equal to the supply voltage

Due to the change of voltage, the current will also change accordingly. The change of current causes many problems in intelligent judgment, among which the phenomenon of water shortage is more serious.

Among them, the situation that water shortage may occur includes that the user uses normal water, and the voltage is relatively high, but the set water shortage threshold B in this state will mistakenly enter water shortage and the motor will stop; in the second case, the user uses normal water, The voltage is relatively low, and the B value under this condition will be high, causing the motor to run continuously and cannot be stopped. If the built-in temperature protection of the motor itself does not work, it will cause the motor to leak electricity or burn the motor; The hardware water level sensor is installed for detection. In practice, due to the fluctuation of the water level in the use environment, when the water level sensor fluctuates up and down, the motor will start frequently, and there will be a large current when starting, which will affect the life of the motor and damage the motor in severe cases.

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