Super capacitor-based energy-saving drive circuit of motor and control method

Abstract

The invention relates to an energy-saving drive circuit of a motor, and aims to provide a super capacitor-based energy-saving drive circuit of a motor and a control method. The main circuit of the circuit consists of a super capacitor bank, a super capacitor charge/discharge management circuit, a controllable rectifying circuit, a controllable rectifying control circuit and the like. Impact to a power grid when an elevator runs is reduced by optimized control of the controllable rectifying circuit and the super capacitor charge/discharge circuit and absorption of running power peak of the elevator, the controllable rectifying circuit bears the smooth part of the electric and generating power of the motor and has emergency power supply function after the elevator is cut off electricity, and the super capacitor and a DC bus form through connection in a normal state to achieve high efficiency. The drive circuit has the advantages of compact line and high integral work efficiency, the service life of the super capacitor is prolonged, and the integral technical and economic performance of the energy feedback elevator is improved. The drive circuit is particularly suitable for driving the energy feedback energy-saving elevator, and is also suitable for motor energy-saving drive situations of a crane and the like.

Description

technical field [0001] The invention relates to a motor energy-saving drive circuit for elevators, cranes, etc., in particular to an energy-saving drive circuit and control method for an energy-feedback elevator system based on a supercapacitor. Background technique [0002] Elevator is a big consumer of electricity in buildings, and its energy-saving research has far-reaching significance in today's increasingly serious energy crisis. At present, the elevator drive circuit structure widely adopts the driving structure of uncontrolled rectification in the front stage and inverter in the rear stage, such as figure 1 shown. According to the operating principle of the elevator, there are two operating modes: forward electric and reverse electric power generation. When running in the power generation mode, the energy is transmitted from the elevator to the power supply side. Since the front stage is an uncontrolled rectification structure, the energy flow cannot be reversed, s...

AI Technical Summary

Problems solved by technology

[0009] Solution (1) will have a large impact on the power grid when the energy feedback power is high, affecting the quality of local power supply; solution (2) has a low cycle life of the battery and high maintenance costs; solution (3) the energy between the supercapacitor and the motor After multi-level switch conversion processing, the efficiency is not high; scheme (4) still needs some batteries, the problem of low cycle life of batteries still exists, and the maintenance cost is high

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