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Energy storage system for elevator

An energy storage system and elevator technology, applied in the field of elevator energy saving, can solve the problems of capacity redundancy and high cost, achieve the effect of lowering the upper limit of power, reducing parallel capacity and system cost, and realizing optimal distribution of power

Active Publication Date: 2020-11-06
GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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  • Abstract
  • Description
  • Claims
  • Application Information

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Problems solved by technology

[0004] Based on this, it is necessary to provide an energy storage system for elevators to solve the problems of redundant capacity and high cost of the current elevator energy storage system

Method used

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Embodiment Construction

[0015] The technical solutions of the present invention will be further described below in conjunction with the accompanying drawings and embodiments.

[0016] Such as figure 1 As shown, the energy storage system of the present invention includes a lithium battery pack 20 , a bidirectional DC / DC converter 10 and a power distribution controller 30 . The high-voltage side of the bidirectional DC / DC converter 10 is connected to both ends of the DC bus 400, and the low-voltage side is connected to the lithium battery pack 20; the detection input terminal of the power distribution controller 30 is connected to the DC bus 400, and the control output terminal is connected to the DC bus 400. The switching circuit 40 of the bidirectional DC / DC converter 10 and the braking resistor 50 is connected in series with the switching circuit 40 to both ends of the DC bus 400 . in addition, figure 1 The structure shown also includes the original traction machine 600 and voltage frequency conve...

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Abstract

The invention discloses an energy storage system for an elevator. The energy storage system for an elevator fully considers the influence of constrained conditions on the capacity of a lithium batterypack, such as the power / energy that the elevator feeds back electric energy and the voltage of a bidirectional DC / DC converter, by means of the mode of combining lithium battery energy storage and brake resistor auxiliary shunting, and obtains the battery pack serial connection cell quantity and the cell capacity calculation formula; and according to the direct current bus voltage, the three-phase phase voltage, the lithium battery pack SOC and other control parameters, the energy storage system for an elevator realizes optimized distribution of regenerative electric energy between the lithium battery pack and the brake resistor. The energy storage system for an elevator can reduce the upper limit of power that the battery pack need to bear on the premise of effectively guaranteeing thatthe direct current bus voltage of the elevator is in the safe range, thus effectively reducing the lithium battery parallel connection capacity and the energy storage system cost.

Description

technical field [0001] The invention relates to the technical field of elevator energy saving, in particular to an energy storage system for elevators. Background technique [0002] When the frequency conversion elevator goes down with heavy load and goes up with light load, its traction machine is in the state of power generation, which can convert the potential energy of the elevator into electric energy and feed it back to the DC power supply network. In order to ensure the safety and reliability of the DC power supply system, elevators are generally equipped with resistors to consume the feedback power to suppress the pumping voltage generated on the DC side, but this causes a great waste of energy. The energy storage method is used to absorb and reuse the feedback electric energy of the elevator. On the one hand, it can effectively suppress the rise of the bus voltage and ensure the safe operation of the power supply system. On the other hand, it can also realize the hi...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02J7/34B66B1/30
CPCY02B50/00
Inventor 林仕立宋文吉冯自平陈永珍吕杰陈明彪
Owner GUANGZHOU INST OF ENERGY CONVERSION - CHINESE ACAD OF SCI
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