Alternating current dual-control and high-voltage matrix frequency-conversion electronic control system of hoisting machine

Abstract

The invention relates to an electronic control system of a hoisting machine, in particular to an alternating current dual-control and high-voltage matrix frequency-conversion electronic control system of the hoisting machine. The electronic control system provided by the invention comprises a high-voltage vacuum switch cabinet (A), a high-voltage matrix frequency converter cabinet (B) and an operating station (E), wherein a transformer cabinet, two power cabinets, a switching cabinet and a control cabinet are arranged in the high-voltage vacuum switch cabinet; the high-voltage vacuum switch cabinet supplies a three-phase power supply to the power cabinets through the transformer cabinet; two sets of PWM (Pulse Width Modulation) control systems are installed in the control cabinet and are respectively in control connection with the power cabinets; the switching cabinet is also in control connection with the power cabinets; the operating station (E) is in control connection with the switching cabinet; and the power output ends of the two power cabinets are respectively connected with an electromotor through the switching cabinet. The electronic control system provided by the invention adopts a vacuum contactor to control frequency-conversion switching, forms the switching of a relay control system comprising intermediate relays with excellent performance and provides reliable control equipment to the energy saving and safety of the hoisting machine in coal mines or mines.

Description

technical field [0001] The invention relates to an electric control system for a hoist, in particular to an AC dual-control high-voltage matrix variable-frequency electric control system for a mine hoist. Background technique [0002] At present, the electrical control systems of mine hoists in China and other coal-producing countries in the world mostly use independent control methods, especially in recent years, the development of programs using PLC technology has certain technical difficulties in use and maintenance, resulting in The analysis and handling of system faults are difficult, which will have a certain impact on the normal production and safe production of the mining industry. [0003] With the global demand for energy saving and consumption reduction, frequency conversion technology has been widely used in various industries, especially high-voltage frequency converters have been widely used in mine hoists. The frequency-variable high voltage produced by the s...

AI Technical Summary

Problems solved by technology

[0004] In particular, the synchronous rectification of the three-phase IGBT full-controlled bridge charges the DC link capacitor, and the voltage on the capacitor provides the IGBT to form a single-phase H-shaped bridge inverter circuit, see figure 1 Schematic diagram of the power unit of ordinary high-voltage inverters. Due to the problems of the capacitor itself, it is difficult to ensure the long-term operation of the inverter, especially the stability and reliability under high-voltage and high-power loads need to be subsidized by bypass

Therefore, there are very large unsafe factors in the application of this kind of high-voltage frequency converter in the electric control system of mine hoist

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