Parallel type energy feedback elevator system

Abstract

The invention discloses a parallel type energy feedback elevator system comprising a variable frequency driving main loop of an elevator, an energy feedback device and a controller, wherein the variable frequency driving main loop consists of an uncontrollable rectifier bridge module, a direct current bus capacitor and an inverting power module; the energy feedback device consists of a boosting and filtering device, a PWM rectifier module, a direct current bus capacitor and a power diode module; the input end of a three-phase power supply is provided with two current sensors; a three-phase input power end of a motor is provided with two current sensors which are used for providing current feedback signals for the controller respectively; the controller is used for providing PWM control signals for the inverting power module and the PWM rectifier module and directly controlling the on and the off of a switch thereof; and the power diode module consists of two power diodes which are serially connected at the positive side and the negative side of a direct current bus. The energy feedback elevator system can reduce the capacity by half, simultaneously restrict the circulating current in the circuit well, and can realize the purposes of energy saving, environment production and cost reduction.

Description

technical field [0001] The invention belongs to an elevator driving system with energy feedback function, especially an elevator driving system capable of power factor compensation in motoring state and energy regeneration in power generation state. Background technique [0002] At present, in the elevator industry, elevators with energy feedback function are already online products of major manufacturers, and these elevators with energy feedback function can generally be divided into two categories, one is series feedback system, and the other is parallel feedback system. [0003] The series feedback system refers to directly replacing the uncontrollable rectifier module with a controllable power module, adopting a dual-PWM main power topology that can work in four quadrants, which can directly realize the two-way flow of energy, and the overall efficiency is high. The power factor can be close to 1 in the electric state. At present, elevator companies using this kind of ...

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Problems solved by technology

For another example, the Chinese patent document with the publication number CN101237185A discloses an "energy feedback and harmonic reactive power compensation system suitable for rectification devices", but this system does not add a diode on the N side of the DC bus, and will rectify The circuit of the module and the uncontrollable rectifier bridge module produces circulating current due to the unbalanced three-phase, which needs to increase the capacity specification of the module; the system input current has large harmonics and high peak values, which also affect the module capacity specification; and the sensor on the input side A large quantity and a large number of models will also increase the cost of the system

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