Elevator variable-frequency traction equipment energy saving system using bidirectional DC (direct current)-DC module

Abstract

An elevator variable-frequency traction equipment energy saving system using a bidirectional DC (direct current)-DC module is characterized by comprising a super capacitor module, a working power supply, a sampling module, the bidirectional DC-DC module and a DC/AC (alternating current) inversion module; the working power supply and the sampling module are connected with a frequency converter respectively; the bidirectional DC-DC module is connected with the working power supply, the sampling module, the supper capacitor module and the DC/AC inversion module; the supper capacitor module is connected with the working power supply and the sampling module. The elevator variable-frequency traction equipment energy saving system has the advantages that a supper capacitor component, an inductor and a capacitor are used for forming a low-pass filter (the inductor mainly used for energy storage is a significant component of a switching power supply toppling structure, and the capacitor is mainly used for voltage ripples), so that the interference to a power grid due to ultraharmonics is avoided, and the elevator variable-frequency traction equipment energy saving system works more safely, stably and reliably.

Description

technical field [0001] The invention relates to the field of elevator energy-saving control, in particular to an energy-saving system for elevator frequency conversion traction equipment using bidirectional DC-DC. Background technique [0002] With the rapid development of science and technology and the rise of the real estate industry, the elevator industry has developed in a blowout manner. People's daily life and industrial logistics have widely used efficient frequency conversion traction systems. Frequency conversion traction systems provide production and life It improves convenience and improves efficiency; but at the same time, there is also a serious common problem in the frequency conversion traction system, that is, the elevators and systems using the frequency conversion traction system use energy consumption resistors to consume energy, so that a large number of available The energy is wasted, and the problem of thermal pollution is caused. The reason for the th...

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Problems solved by technology

[0002] With the rapid development of science and technology and the rise of the real estate industry, the elevator industry has developed in a blowout manner. People's daily life and industrial logistics have widely used efficient frequency conversion traction systems. Frequency conversion traction systems provide production and life It improves convenience and improves efficiency; but at the same time, there is also a serious common problem in the frequency conversion traction system, that is, the elevators and systems using the frequency conversion traction system use energy consumption resistors to consume energy, so that a large number of available The energy is wasted, and the problem of thermal pollution is caused. The reason for the thermal pollution problem is that the potential energy and braking energy generated by the equipment in the variable frequency traction system during the upward or downward operation are converted by the heating resistor into the thermal energy. If the generated energy is not consumed in time, the bus voltage of the frequency converter will increase, affecting the normal operation of the equipment and causing failures, which will result in a serious waste of energy.

[0003] In recent years, people have made a lot of improvements in the energy recovery of the frequency conversion traction system, but all of them are to directly return the electric energy originally consumed by the energy consumption resistor to the grid through DC / AC inverter, so that the equipment itself cannot use this part At the same time, the high-order harmonics will be caused by the inverter when the electric energy is sent back, and the high-order harmonics will cause a certain degree of impact on the power grid, affecting the safe and stable operation of the power supply grid, and there are potential safety hazards

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