Energy-saving device and method for dynamic reactive power compensation of pumping unit

Abstract

The invention discloses a device for dynamic reactive power compensation energy saving of an oil pumping unit. The device comprises a data collection control unit, voltage collection units, current collection units, a rectifying unit and an inversion unit. Power grid voltage is connected with the input end of the rectifying unit through a filtering circuit, the output end of the rectifying unit is connected with the input end of the inversion unit, the output end of the inversion unit is connected with the power supply end of a motor of the oil pumping unit, and the signal control ends of the rectifying unit and the inversion unit are connected with the driving signal output end of the data collection control unit respectively. The device is further provided with the voltage collection units and the current collection units, the signal output ends of the current collection units and the voltage collection units are connected with the signal input end of the data collection control unit, and the data collection control unit is further provided with a voltage zero passage signal detection system. The device can compensate reactive power of impact load, balances three-phase active current, enables the oil pumping unit to continuously pump oil, enables the oil pumping unit to run in intermittently or in frequency reducing mode according to oil quantity and automatically adjust pumping speed, improves power factor and reduces power loss.

Description

technical field [0001] The invention relates to a reactive power compensation energy-saving device, in particular to a dynamic reactive power compensation energy-saving device and method for adjusting a pumping unit. Background technique [0002] At present, the electrical part of the pumping unit is mainly composed of a three-phase asynchronous motor and a control circuit. The motor drives the sucker rod to reciprocate, pumping crude oil continuously from the ground to the ground, and the load of the pumping unit is The stroke is a cyclical load with a continuously changing period. When the sucker rod is lowered, the load is very light, which is equivalent to no load, but when it is raised, the crude oil is pumped out of the ground, so the load is very heavy, which is equivalent to a full load. Therefore, the load of the pumping unit is constantly changing, and the changing cycle is also very short. The load changes twice in each stroke, and the heavy-duty working time is ...

AI Technical Summary

Problems solved by technology

The frequency conversion device of this topology usually adopts the method of energy consumption and resistance consumption for the "reverse power generation" of the motor caused by the unbalanced operation of the beam pumping unit, but this method will not only generate a lot of harmonic pollution, The output harmonics are relatively serious, which brings harmonic pollution to the power system grid, and at the same time causes a lot of energy waste

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