LC filter elevator energy feedback device

Abstract

The invention relates to an LC filter elevator energy feedback device which comprises a three-phase uncontrollable rectifier module, a direct-current bus side capacitor, a three-phase full-bridge controllable inverter module and an elevator traction machine, wherein the three-phase uncontrollable rectifier module, the direct-current bus side capacitor, the three-phase full-bridge controllable inverter module and the elevator traction machine are sequentially connected. The three-phase full-bridge controllable inverter module is connected with a three-phase power grid through a grid -connected inverter at the same time. The device is characterized in that an LC filter, an isolating diode and a voltage stabilizing capacitor are further included, the LC filter is connected between the output end of the grid-connected inverter and the three-phase power grid, the voltage stabilizing capacitor is connected with the input end of the grid-connected inverter in parallel, the P electrode of the isolating diode is connected with the positive pole of the direct-current bus side capacitor, and the N electrode of the isolating diode is connected with the positive pole of the voltage stabilizing capacitor. According to the elevator energy feedback device, the characteristic that a low-power elevator system with the power of 7.5 KW or below has large circuit equivalent resistance is fully used, oscillation can be effectively prevented through network side equivalent resistance, grid-connected current high harmonics are filtered, extra loss is not generated, system stability is high, and social benefits and economic benefits are remarkable.

Description

technical field [0001] The invention belongs to the technical field of elevator control, in particular to an LC filter elevator energy feedback device. Background technique [0002] With the acceleration of the urbanization process, many urban buildings have begun to develop vertically. As the main means of transportation in high-rise buildings, the more floors there are, the greater the energy consumption of elevators. The development of an energy-saving society requires higher energy-saving elevators. Intelligence, efficiency, and environmental protection will become the development trend of the elevator industry in the future. Common goal. [0003] In the elevator frequency conversion speed regulation system, the elevator is a potential energy load. When the heavy load goes down, the light load goes up or brakes, the traction machine is in the state of regenerative power generation, and the generated regenerative power is converted into DC by the inverter and transmitted...

AI Technical Summary

Problems solved by technology

Elevator energy feedback filters usually include three types: L, LC and LCL. The L-type filter has a simple structure, but the filtering effect on the switching ripple is not obvious, and the high-frequency characteristics are poor. Increasing the inductance to improve the filtering effect will cause system Large size; LCL type filter has a good suppression effect on high-order harmonics, but it is a third-order system, the system control is complicated, the parameter design is complicated and resonance is easy to occur, which threatens the stability of the system

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