Frequency-conversion traction equipment energy-saving system for elevator

Abstract

The invention discloses a frequency-conversion traction equipment energy-saving system for an elevator, The system comprises a DC / DC module A, a super capacitor assembly, a DC / DC module B, a detection control module, an auxiliary power supply and a DC / AC module that are connected with a frequency converter; the DC / DC module A is connected with the super capacitor assembly; the super capacitor assembly is respectively connected with the DC / DC module B and the DC / AC module; a control module used for detecting the terminal voltage of the super capacitor assembly is connected with the DC / DC module A and the DC / DC module B; and the detection control module for controlling the operation of the AC / AC module and the auxiliary power supply is connected with the DC / AC module and the auxiliary powersupply. By using one set of super capacitor assembly, the frequency-conversion traction equipment energy-saving system lowers the manufacturing cost of products and simultaneously avoids the interference of high-order harmonic on a power grid, therefore the system can work more stably and reliably; and by adoption of the system, the running energy consumption of the elevator can be saved by more than 30 percent, and the energy-saving effect is obvious.

Description

technical field [0001] The invention belongs to the field of elevator energy-saving control, in particular to an energy-saving system for frequency conversion traction equipment for elevators. Background technique [0002] With the rapid development of science and technology and the rise of the real estate industry, the elevator industry has shown a blowout growth. People's daily life and industrial logistics and other fields have used a large number of 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 shown a blowout growth. People's daily life and industrial logistics and other fields have used a large number of 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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