CN-122026590-A - Energy storage type elevator energy feedback system capable of supplying power to emergency leveling device

CN122026590ACN 122026590 ACN122026590 ACN 122026590ACN-122026590-A

Abstract

The invention discloses an energy storage type elevator energy feedback system capable of supplying power to an emergency leveling device, which relates to the technical field of electric energy management and emergency power supply, and comprises a control module which is in signal connection with a bidirectional DC/DC converter, an energy feedback module, an emergency power supply module and a protection module, is configured to monitor the mains state, the DC bus voltage and the state of charge of the energy storage module and control the system to switch between the energy saving feedback mode and the emergency power mode in response thereto. According to the elevator main system, the control module is used for carrying out mode switching based on the state of charge of the commercial power, the voltage of the direct current bus and the state of charge of the energy storage module, and a hardware interlocking circuit is used for executing a strict time sequence control strategy, so that the safety and reliability of the system in the switching process between the energy-saving feedback mode and the emergency power supply mode are ensured, the risks of current impact, voltage mismatch, electric energy backflow and the like are effectively avoided, and the stable operation of the elevator main system is ensured.

Inventors

Luo Gangqiang
BAO DEGANG
HE YUN
HU BING
HE JIN
CHEN JIEXING
HUANG YAOQIANG
LAI XIN
HUANG ZHILIANG
WANG XIAOYU

Assignees

招商南光电梯科技(深圳)有限公司

Dates

Publication Date: 20260512
Application Date: 20251216

Claims (10)

1. The energy storage type elevator energy feedback system capable of supplying power to the emergency leveling device is characterized by comprising an energy absorption module, a bidirectional DC/DC converter, an energy storage module, an energy feedback module, an emergency power supply module, a protection module, a control module and an energy efficiency optimization module; The input end of the energy absorption module is connected to a direct current bus of the elevator frequency converter through a quick fuse and is used for absorbing electric energy generated by regenerative braking of the elevator; The high-voltage side of the bidirectional DC/DC converter is connected with the output end of the energy absorption module and the input end of the energy feedback module, and the low-voltage side of the bidirectional DC/DC converter is connected with the energy storage module and the input end of the emergency power supply module, so that bidirectional energy transmission and voltage conversion are realized; the energy storage module is used for storing and releasing electric energy; The energy feedback module comprises a grid-connected inverter, and the output end of the grid-connected inverter is connected to a power grid and used for feeding electric energy back to the power grid; The emergency power supply module comprises an inverter, wherein the output end of the inverter is connected to an elevator traction machine motor, and the inverter is used for converting stored energy into three-phase alternating current to be output when the commercial power is abnormal, driving an elevator to run to a flat floor and opening a car door; the protection module comprises a hardware interlocking circuit which is in signal connection with the control module and is configured to perform safety interlocking and fault protection in the system mode switching process; The control module is in signal connection with the bidirectional DC/DC converter, the energy feedback module, the emergency power supply module and the protection module, and is configured to monitor the state of the mains supply, the voltage of the direct current bus and the state of charge of the energy storage module, and accordingly control the system to switch between an energy-saving feedback mode and an emergency power supply mode; the energy efficiency optimization module is in signal connection with the control module and is used for executing load prediction and energy distribution optimization.
2. The energy storage elevator energy feedback system of claim 1, wherein the protection module is configured to: When the high-voltage end circuit breaking test of the energy-saving module is executed, after the input side circuit breaker is disconnected, the elevator energy-saving device can work normally and has no influence on an elevator; when a short circuit test is executed, when a short circuit occurs between the positive electrode and the negative electrode of the high-voltage side, the quick fuse is fused, the circuit breaker trips, the protection function is effective, and the elevator can work normally.
3. The energy storage elevator energy feedback system of claim 1, wherein the hardware interlock circuit of the protection module is configured to implement a timing control strategy coupled to control of the bi-directional DC/DC converter, comprising: When the energy-saving feedback mode is switched to the emergency power supply mode, the bidirectional DC/DC converter is firstly instructed to stop the original working mode, the output voltage of the low-voltage side of the bidirectional DC/DC converter is regulated to a voltage value matched with the current voltage of the energy storage module, and after 50-100ms delay confirmation, a contactor connected with the input end of the emergency power supply module is closed; After the switching is completed, the bidirectional DC/DC converter is instructed to switch to a low-voltage side constant-voltage output mode.
4. The energy storage type elevator energy feedback system capable of supplying power to an emergency floor leveling device according to claim 3, wherein the hardware interlocking circuit of the protection module further comprises a quick turn-off branch circuit, which is arranged between the low voltage side of the bidirectional DC/DC converter and the input end of the emergency power supply module, wherein a current sensor and a solid state relay are arranged in the quick turn-off branch circuit; The current sensor is configured to distinguish a discharge current of the energy storage module from a reverse current generated by reverse conduction of an inverter in the emergency power supply module based on a current direction detection principle, and to drive the solid state relay to open a loop only when a continuous reverse current is detected for more than 10 ms.
5. The energy storage elevator energy feedback system of claim 4, wherein the protection module further comprises an insulation resistance detection unit configured to measure an insulation resistance between the input circuit of the energy absorption module and the housing, and the insulation resistance is not less than 0.5mΩ.
6. The energy storage elevator energy feedback system of claim 1, wherein the control module is configured to control the emergency power supply module to provide a short peak power of no less than 150% of the rated power of the elevator motor for a duration of 0.2-0.5 seconds at the moment of start-up to achieve an emergency leveling of the elevator in an emergency power supply mode.
7. The energy storage elevator energy feedback system of claim 1, wherein the control module is configured to dynamically set a voltage threshold for energy feedback based on elevator operating conditions, wherein: When the elevator motor is in a power generation braking state, a first group of voltage thresholds V1a and V2a are adopted, wherein V1a is a feedback starting threshold value, and V2a is a feedback full power threshold value; When the elevator motor is in an electric operation state and the direct current bus voltage is provided by a power grid side, a second group of voltage thresholds V1b and V2b are adopted, wherein V1b is a feedback starting threshold value, and V2b is a feedback full power threshold value; Wherein V1a < V1b, and V2a < V2b.
8. An energy storage elevator energy feedback system for supplying power to an emergency floor leveling device according to claim 1, wherein the control module distributes power in accordance with the following principles: Preferentially guaranteeing the power output requirement of the emergency power supply module; After the emergency power supply requirement is met, whether the power feedback function of the energy feedback module to the power grid is started or not is determined according to the comparison result of the current direct current bus voltage and a dynamically set feedback starting threshold V3, and the feedback starting threshold V3 is dynamically adjusted based on the real-time electricity price signal of the power grid and the charge state of the energy storage module.
9. The energy storage elevator energy feedback system of claim 1, wherein the control module is configured to implement an adaptive soft start strategy based on battery health, the strategy cooperating with timing control of the hardware interlock circuit, comprising: before the emergency power supply module is started, dynamically calculating the maximum peak current Imax which can be safely provided by the energy storage module based on the real-time health state SOH and the internal resistance of the energy storage module; Assigning the Imax value to an inverter controller in the emergency power supply module as an upper limit of a current loop given value thereof; Meanwhile, the starting command of the emergency power supply module is delayed by the hardware interlocking circuit, and the starting command is not allowed to execute the soft start process limited by the Imax until the bidirectional DC/DC converter is confirmed to establish stable low-voltage side output voltage.
10. The energy storage elevator energy feedback system of claim 1, wherein the energy efficiency optimization module is configured to implement a predictive energy buffering strategy for dc bus voltage stabilization, comprising: based on historical operation data, predicting the elevator operation frequency in a short period in the future by adopting a time sequence analysis method; When a high running frequency period is predicted, the control module is instructed to preferentially maintain the charge state of the energy storage module at a high position, so that when the elevator is in regenerative braking, the bidirectional DC/DC converter and the energy storage module have enough capacity to quickly absorb electric energy, and the rising of the direct current bus voltage is actively stabilized; When a low operating frequency period is predicted, the requirements on the state of charge are reduced, focusing on energy storage; the energy efficiency optimization module also calculates the electricity saving efficiency based on the cyclic test data of the elevator under different loads by comparing the electricity consumption values of the energy saving device when the energy saving device is used and not used.

Description

Energy storage type elevator energy feedback system capable of supplying power to emergency leveling device Technical Field The invention relates to the technical field of electric energy management and emergency power supply, in particular to an energy storage type elevator energy feedback system capable of supplying power to an emergency leveling device. Background With the acceleration of the urban process and the popularization of high-rise buildings, elevators have become indispensable vertical transport means in modern buildings, whose energy consumption occupies a significant proportion of the total energy consumption of the building. In the running process of the elevator, particularly when the elevator ascends under light load or descends under heavy load, the traction motor is in a regenerative braking state, and a large amount of regenerated electric energy can be generated. These electrical energy is traditionally dissipated in the form of heat energy through the brake resistor, which not only causes waste of energy, but also causes temperature rise of the machine room, requires additional air conditioning for heat dissipation, and further increases energy consumption. In the context of global advocation of energy conservation and emission reduction and green construction, how to efficiently recycle and utilize regenerative braking energy of an elevator has become an important development direction in the field. At present, the technology for recovering the energy of the elevator has been developed fairly, and the main scheme is to adopt an energy feedback device to feedback the regenerated electric energy to the power grid after inversion, so as to achieve the purpose of energy saving. Meanwhile, to ensure the safety of passengers in the case of a mains failure of an elevator, elevator systems are often equipped with a separate emergency landing device, which is equipped with a battery and an inverter, and which can provide electricity to drive the elevator to a nearby floor and open the door when the power is cut off. However, the two existing devices, the energy feedback device and the emergency floor device, are typically independent systems in technology and physics. The power conversion circuit and the control unit respectively have a special energy storage unit, a special power conversion circuit and a special control unit, and form a pattern of two sets of hardware and two functions. The discrete architecture is relatively mature in technology, and can respectively realize the basic functions of energy feedback and emergency power supply. However, this conventional discrete solution has several inherent drawbacks. First, the repeated configuration of the hardware of the two systems results in high equipment cost, large occupied space and reduced economy and applicability. And secondly, the storage battery in the independent emergency leveling device is only used under the passive power-off condition, is in a floating charge standby state in daily life, has extremely low equipment utilization rate, and is easy to age in advance due to the fact that effective charge and discharge cycles are lacked for a long time, so that emergency reliability of the storage battery is affected. More importantly, when two systems are simultaneously connected to an elevator, control conflict and electrical interference risks can exist, for example, current impact and even backflow can be generated in the mode switching process, and system safety is threatened. In addition, the existing energy feedback system has single function, lacks intelligent sensing and predicting capability on power grid state, real-time electricity price and elevator operation habit, and cannot realize fine, self-adaptive and economic optimal management of energy. Therefore, it is necessary to provide an energy storage type elevator energy feedback system for supplying power to an emergency leveling device to solve the above problems. Disclosure of Invention The invention aims to provide an energy storage type elevator energy feedback system capable of supplying power to an emergency leveling device so as to solve the problems in the background art. The energy storage type elevator energy feedback system capable of supplying power to the emergency leveling device comprises an energy absorption module, a bidirectional DC/DC converter, an energy storage module, an energy feedback module, an emergency power supply module, a protection module, a control module and an energy efficiency optimization module; The input end of the energy absorption module is connected to a direct current bus of the elevator frequency converter through a quick fuse and is used for absorbing electric energy generated by regenerative braking of the elevator; The high-voltage side of the bidirectional DC/DC converter is connected with the output end of the energy absorption module and the input end of the energy feedback module, and the low-voltage side of the bi