Control device for elevator

Abstract

The invention discloses a control device for an elevator. The device comprises an energy storage device (20), an energy storage device state detector (21), a charge / discharge circuit (19), an energy storage device controller (22), an energy consumption circuit (5) and an energy consumption circuit control device (18), wherein the charge / discharge circuit (19) comprises n parallel branches; and when the regenerated energy of the elevator exceeds the storage capacity of the energy storage device (20) or the regenerated current or regenerated power of the elevator exceeds the acceptable upper limit of the energy storage device (20) or charge / discharge circuit (19), the energy consumption circuit control device (18) controls the energy consumption circuit (5) to completely or partially consume the exceeding part of the regenerated current or power so that the bus voltage is constant or changes according to the predetermined rule and / or the energy storage device is charged in a range avoiding overcharge. According to the invention, the equipment capacity of the elevator power system can be effectively reduced, the electric parameters and power consumption of the power module are effectively reduced, and the service life is prolonged.

Description

technical field [0001] The invention relates to an elevator control device, in particular to a control device for an elevator which uses a charging and discharging circuit containing n branches and an energy storage device to realize energy saving of the elevator and reduce the electrical capacity of the elevator power supply equipment. Background technique [0002] For the regenerative energy generated by the elevator motor during regenerative operation, the energy storage device can be used to temporarily store it, and when the elevator motor is in electric operation, the stored regenerative energy is sent back to the DC bus and provided to the elevator motor, thereby providing The electric operation of the elevator motor provides electric energy, which can not only solve the problem of regenerative energy processing, but also significantly reduce the energy consumption of the elevator and realize the energy saving of the elevator. [0003] In the existing technology of us...

AI Technical Summary

Problems solved by technology

[0004] (1) Since the voltage level of the energy storage device is usually much lower than the DC bus voltage of the elevator, when the elevator motor generates regenerative energy with a certain power and needs to be stored in the energy storage device, the energy storage device in the charging and discharging circuit is often A large current is generated on the side, which will greatly increase the rated current value of the power switching elements that make up the charging and discharging circuit, which will lead to a significant increase in cost

[0005] (2) The control of the charging and discharging circuit with this structure is difficult

However, the duty cycle in this control method is preset or by increasing or decreasing a variable DT on the existing closing time to realize the control of the current or power flowing into the regenerative resistor instead of continuous change, and its control performance needs to be improved.

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