Lift energy feedback, reactive compensation and switched-off emergency running method and system

Abstract

The invention provides lift energy feedback, reactive compensation and switched-off emergency running method and system. The system comprises an energy feedback module, a reactive compensation module and a lift switched-off emergency running module. The energy feedback module comprising an inverted circuit, a control circuit and a filter circuit and the reactive compensation module can feed back energy generated when a lift brakes to a power grid and generate reactive current for compensating reactive power when the lift is in an electric running state; and a lift switched-off emergency running circuit can ensure that lift control power is taken over by the switching of a switch under abnormal power supply of the power grid, run the lift to the leveling position and open a car door and a hall door so that a passenger safely walks out of the lift. The system has the advantages of simple structure, reliable running, less loss, low cost, high power factor and no harmonic pollution on thepower grid and integrates various functions of lift frequency converter plug-in type energy feedback, reactive compensation, emergency leveling, and the like.

Description

technical field [0001] The technology of the present invention relates to energy feedback, reactive power compensation and elevator emergency leveling device of frequency conversion elevator, in particular to an elevator energy feedback, reactive power compensation and power failure emergency operation method and system. technical background [0002] With the development of power electronics technology, as a product of the development of power electronics technology, frequency converters have been widely used in various fields of the national economy such as metallurgy, petrochemicals, tap water, electric power and other industries, and are playing an increasingly important role. Especially in the recent development of the construction industry, residential buildings, office buildings, and large hotels are everywhere, and the elevators are growing at an alarming rate. At the same time, the power consumption of the elevators is also increasing at an alarming rate. The elevato...

AI Technical Summary

Problems solved by technology

In small and medium-capacity systems, energy-consumption braking is generally adopted. Although this method is simple, it has the following disadvantages: waste of energy, low system efficiency; serious heating of resistors, which affects the normal operation of other parts of the system; simple energy-consumption braking cannot Timely dampening of the pumped voltage generated by rapid braking limits performance gains

However, the common problem of these products is that these devices are expensive and have a single function. In addition, some products have high requirements on the power grid, which is not suitable for my country's national conditions.

[0008] Chinese patent document CN200710168665.3 disclosed on December 7, 2007 an "energy feedback and harmonic reactive power compensation system suitable for rectification devices". The system uses active filters and harmonic compensation to achieve energy feedback and harmonic Wave reactive power compensation, but its pertinence to the elevator system is not strong, and it cannot realize the emergency leveling function

[0009] Chinese patent document CN 201089681Y disclosed an "elevator emergency device" on September 24, 2008, which can realize emergency leveling of elevators, but the utilization rate of the device is not high

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