Combined variable frequency control system and method for open pit coal mine open drainage system

Abstract

The invention relates to the field of motor control, and particularly relates to a combined variable frequency control system for an open pit coal mine open drainage system. The combined variable frequency control system comprises power frequency equipment, variable frequency equipment, a power frequency PLC, a variable frequency PLC and a water pump; the water pump is respectively and electrically connected with the power frequency equipment and the variable frequency equipment, and the power frequency equipment and the variable frequency equipment are respectively connected into a three-phase circuit. the power frequency PLC is electrically connected with the power frequency equipment, the power frequency equipment is used for directly implementing power-on and power-off of the water pump, and the power frequency PLC is used for controlling the power frequency equipment to act; the variable frequency PLC is electrically connected with the variable frequency equipment, the variable frequency equipment is used for directly implementing power-on and power-off of the water pump, and the variable frequency PLC is used for controlling the variable frequency equipment to act; the power frequency PLC and the variable frequency PLC carry out data transmission in a wireless mode; and effects of reducing the usage amount of control cables and reducing the investment are achieved.

Description

technical field [0001] The invention relates to the field of motor control, in particular to a combined frequency conversion control system and method for an open-pit coal mine open row system. Background technique [0002] Since the floor flood control system of the open-pit mine stope is greatly affected by unstable rainfall and the flow of incoming water is unstable, the 6kV water pump adopts power frequency equipment plus PLC control, and PLC is used to control the power on and off of the power frequency equipment, because the power frequency equipment The frequency of electricity cannot be adjusted, so the drainage flow of the water pump is fixed; when the rainfall is small, the water pump is prone to run dry without water; running. [0003] The existing technology is generally used to adjust the operating frequency of the water pump by increasing the bypass of the frequency conversion device; to adjust the frequency output of the frequency conversion device with the c...

AI Technical Summary

Problems solved by technology

[0002] Since the floor flood control system of the open-pit mine stope is greatly affected by unstable rainfall and the flow of incoming water is unstable, the 6kV water pump adopts power frequency equipment plus PLC control, and PLC is used to control the power on and off of the power frequency equipment, because the power frequency equipment The frequency of electricity cannot be adjusted, so the drainage flow of the water pump is fixed; when the rainfall is small, the water pump is prone to run dry without water; running

[0003] The existing technology is generally used to adjust the operating frequency of the water pump by increasing the bypass of the frequency conversion device; to adjust the frequency output of the frequency conversion device with the change of rainfall, to control the drainage flow of the water pump, so that the entire drainage system is always in the optimal drainage condition; now There is a set of PLC to realize the control of power frequency equipment and frequency conversion equipment; but the power frequency device is far away from the frequency conversion device, and a large number of cables are required to be laid from the PLC to the frequency conversion device. The investment is large, and the mine environment is poor. PLC is connected to the frequency conversion device The cables are prone to damage (resulting in the inability of the frequency conversion equipment to operate and the entire system to be out of service), which affects the reliability of the system operation

Images