Elevator energy-saving apparatus

Abstract

The present invention provides an elevator energy-saving apparatus, connected in parallel to an elevator variable-frequency drive bus, and comprising: a battery pack, a battery management system (BMS), a power control system, a DC-DC direct current power supply, and a PLC controller, wherein the DC-DC direct current power supply is connected to the BMS and is connected in parallel to the elevator variable-frequency drive bus; the PLC controller is connected to the DC-DC direct current power supply; under the action of the PLC controller, the DC-DC direct current power supply changes a voltage inputted from the battery pack to a second preset voltage, so as to control the voltage of a high-voltage end to be at the second preset voltage; and under the action of a high and low voltage difference, when an elevator generates electricity, the voltage on the elevator variable-frequency drive bus does not rise to a first preset voltage, and a current automatically flows to the elevator energy-saving apparatus. The present invention has the characteristics of energy saving and high efficiency, reducing operating costs, stable operation, reducing the pressure of a power grid, and prolonging the service life of a device.

Description

An elevator energy-saving device Technical Field

[0001] This invention relates to the field of elevator equipment technology, and in particular to an elevator energy-saving device. Background Technology

[0002] An elevator is a vertical transportation device that carries people or goods vertically; it is a common mode of transportation in people's daily lives. Below are some common energy-saving features for elevators:

[0003] (1) Elevator energy feedback device

[0004] Energy feedback technology is maturing. By recovering and reusing the regenerative electricity generated during elevator operation, energy consumption is effectively reduced. Simultaneously, the application of intelligent control systems makes elevator operation more efficient, flexibly adjusting operating modes according to actual usage to reduce unnecessary energy consumption. Furthermore, the use of new materials in elevator components, such as lighter and stronger alloys, reduces the elevator's weight, thereby decreasing its energy requirements during operation.

[0005] This technology still has some shortcomings and deficiencies:

[0006] 1. Cost Issues. The initial investment in energy feedback systems is relatively high, which limits their large-scale application to some extent, especially for the renovation of some older elevators, where cost is one of the obstacles.

[0007] 2. Compatibility issues. Differences in electrical characteristics and other aspects between elevator brands and models may lead to poor compatibility between the energy feedback system and the elevator system, affecting its normal operation and energy-saving performance.

[0008] 3. Environmental adaptability. Under certain special environmental conditions, such as high temperature, high humidity, and strong electromagnetic interference, the performance of the energy feedback system may be affected, resulting in problems such as decreased stability.

[0009] 4. Energy feedback quality. Although it is possible to feed electrical energy back, the quality of the energy may fluctuate, causing some interference to the power grid. Further optimization of control strategies is needed to improve this.

[0010] 5. Inconsistent technical standards. The quality of energy feedback systems on the market varies greatly, and there is a lack of unified and clear technical standards and specifications, which causes some confusion for users when selecting and using them.

[0011] (2) Capacitor-type elevator energy-saving device

[0012] Capacitor-based elevator energy-saving devices utilize capacitors to store electrical energy, thereby improving the energy efficiency of elevators. The following is a detailed description of the development status, shortcomings, and limitations of capacitor-based elevator energy-saving device technology:

[0013] Capacitor-based energy-saving technology for elevators has seen some development in recent years. With increasing focus on energy efficiency, the elevator industry is actively exploring energy-saving technologies. Capacitor-based energy-saving devices reduce elevator energy consumption by recovering and storing energy during elevator operation and then releasing it when needed. Some elevator manufacturers have begun integrating capacitor-based energy-saving devices into their products and have achieved certain energy-saving effects. Furthermore, research institutions and scholars are continuously exploring and improving capacitor-based energy-saving technology to enhance its performance and reliability.

[0014] This technology still has some shortcomings and deficiencies:

[0015] 1. Limited Energy Storage Capacity: The relatively small energy storage capacity of capacitors limits their application in elevator energy conservation. For large elevators or high-load operation, larger capacity energy storage devices may be needed to achieve significant energy savings.

[0016] 2. Charge / discharge efficiency issues: Energy loss occurs during the charging and discharging process of a capacitor, which affects the overall efficiency of the energy-saving device. Furthermore, frequent charge / discharge cycles may also impact the lifespan of the capacitor.

[0017] 3. Higher Cost: Compared to traditional elevator systems, capacitor-based energy-saving devices are more expensive. This includes the cost of the capacitor itself, as well as the associated control system and circuitry. This higher cost may limit its widespread application in some markets.

[0018] 4. Environmental adaptability: Capacitors are sensitive to environmental conditions such as temperature and humidity, and additional measures may be required to ensure their reliability and performance in different environments.

[0019] 5. Maintenance and Management: Capacitor-type energy-saving devices require regular maintenance and inspection to ensure their normal operation and performance. This increases the maintenance cost and complexity of the elevator system.

[0020] (3) Ard elevator automatic rescue device

[0021] The development of automatic elevator rescue devices can be traced back to the 1990s, when some elevator manufacturers began to research and produce such devices. These devices mainly use energy storage as a backup power source. When the elevator experiences a power outage, the energy storage can provide a short-term power supply, enabling the elevator to travel to the nearest floor and open the doors, allowing passengers to evacuate safely.

[0022] With continuous technological advancements, the performance and functionality of automatic elevator rescue devices have been constantly improved. Currently, automatic elevator rescue devices on the market possess multiple functions, such as automatic elevator fault detection, automatic initiation of rescue procedures, and automatic charging. Furthermore, some newer automatic elevator rescue devices utilize more advanced technologies, such as supercapacitors and lithium batteries. The application of these technologies not only improves the performance and reliability of automatic elevator rescue devices but also reduces their cost and maintenance complexity.

[0023] This technology still has some shortcomings and deficiencies:

[0024] 1. Limited scope of application: Automatic elevator rescue devices can usually only provide temporary power support when the elevator is out of service or malfunctions, and cannot solve the problem of long-term elevator shutdown or major malfunctions.

[0025] 2. Reliability needs improvement: The automatic elevator rescue device is an electromechanical integrated device, and its reliability is affected by various factors, such as lifespan, circuit failure, and mechanical component damage. If the automatic elevator rescue device malfunctions, it may lead to rescue failure and endanger the lives of passengers.

[0026] 3. High maintenance costs: Elevator automatic rescue devices require regular maintenance and upkeep, such as replacing and inspecting circuits and cleaning mechanical parts. These maintenance tasks require professional technicians and equipment, resulting in high maintenance costs.

[0027] 4. High environmental requirements: Elevator automatic rescue devices have high environmental requirements, such as temperature, humidity, and dust. Harsh environmental conditions may affect the performance and reliability of the elevator automatic rescue device.

[0028] 5. Lack of unified standards: At present, the standards and specifications for automatic elevator rescue devices are not perfect. Automatic elevator rescue devices produced by different manufacturers vary greatly in terms of performance, function and reliability, which brings certain difficulties to users in selection and use. Summary of the Invention

[0029] The purpose of this invention is to at least address one of the aforementioned technical deficiencies.

[0030] Therefore, one object of the present invention is to provide an elevator energy-saving device to solve the problems mentioned in the background art and overcome the shortcomings of the prior art.

[0031] To achieve the above objectives, embodiments of the present invention provide an elevator energy-saving device. One end of the main contactor is connected to the power grid, and the other end of the main contactor is connected to the elevator frequency converter. The elevator frequency converter rectifies the connected power grid voltage and sends it to the elevator frequency converter bus. A high-frequency switch and a braking resistor are connected in parallel and in series on the elevator frequency converter bus. An inverter is connected to the rear end of the high-frequency switch and the braking resistor, and the inverter is further connected to the elevator.

[0032] When the elevator generates electricity from potential energy, the voltage of the elevator inverter bus rises. When it rises to the first preset voltage, the braking resistor works and switches back and forth through the high-frequency switch to maintain the voltage at the first preset voltage.

[0033] The elevator energy-saving device is connected in parallel to the elevator inverter bus and includes: a battery pack, a BMS battery management system, a power control system, a DC-DC power supply and a PLC controller. The DC-DC power supply is connected to the BMS battery management system and is connected in parallel to the elevator inverter bus. The PLC controller is connected to the DC-DC power supply. Under the action of the PLC controller, the DC-DC power supply transforms the voltage connected to the battery pack to the second preset voltage to control the voltage at the high voltage end at the second preset voltage.

[0034] Under the influence of the high and low voltage difference, when the elevator generates electricity, the voltage on the elevator inverter bus will not rise to the first preset voltage, and the current will automatically flow to the elevator energy-saving device.

[0035] Preferably, of any of the above schemes, the first preset voltage is 550~680V and the second preset voltage is 580V.

[0036] Preferably, in any of the above schemes, when the power generation of the elevator exceeds the threshold, after the elevator energy-saving device is fully loaded, the excess electrical energy causes the voltage to rise to the first preset voltage, and the braking resistor is activated to consume the excess electrical energy.

[0037] Preferably, in any of the above schemes, the elevator energy-saving device is connected in parallel with multiple elevators, and the elevator inverter bus of each elevator is connected in parallel to the high-voltage end of the DC-DC power supply after passing through a circuit breaker and a contactor.

[0038] Preferred from any of the above solutions is that the current from the elevator in power generation mode is directly transferred to the elevator in power consumption mode through the elevator energy-saving device.

[0039] When multiple elevators generate or discharge power simultaneously, the power of the battery pack is used first, and the power of the grid is used only after the power of the battery pack drops to a preset value.

[0040] When the elevator is not in use, the current first flows to the DC-DC power supply and then is stored in the battery pack.

[0041] Preferably, any of the above solutions also includes one or more DC meters, each corresponding to an elevator and connected between the elevator and the elevator energy-saving device, for recording the electricity exchanged between the corresponding single elevator and the elevator energy-saving device.

[0042] Preferably, as described in any of the above schemes, the electrical data includes: voltage, current, forward electrical energy, and reverse electrical energy.

[0043] Preferably, the DC meter uses a billing method that records the electricity flowing unidirectionally out of or into the meter, including the electricity used from the battery pack and the electricity generated by other devices that directly affects the elevator.

[0044] Preferably, in any of the above schemes, each of the DC meters is connected to the negative terminal of the elevator inverter bus and the negative terminal of the high-voltage bus of the corresponding elevator via a shunt, and the high-voltage DC relay is connected to the positive terminal of the elevator inverter bus and the positive terminal of the high-voltage bus of the corresponding elevator.

[0045] Compared with the prior art, the present invention has the following advantages:

[0046] 1. Energy-saving and efficient: It can recover the potential and kinetic energy generated during elevator operation and convert it into electrical energy for storage, so as to use it in subsequent operation, thereby significantly reducing the energy consumption of elevators.

[0047] 2. Reduce operating costs: By saving energy, electricity consumption is reduced, saving elevator operators a significant amount of electricity expenses.

[0048] 3. Smooth operation: It helps improve the smoothness of elevator operation, reduces the impact during start-up and stop, and improves passenger comfort.

[0049] 4. Reduce grid pressure: During peak electricity consumption periods, energy storage battery packs can power elevators, reducing reliance on the grid and lowering the load on the grid.

[0050] 5. Environmental protection and emission reduction: Reducing energy consumption means reducing greenhouse gas emissions, which is of positive significance for environmental protection.

[0051] 6. Emergency Backup: In emergency situations such as power outages, the energy storage battery pack can provide some power support to ensure the basic operation of the elevator and ensure passenger safety.

[0052] 7. Extend equipment life: Smooth operation and reasonable energy management help reduce wear and tear on elevator mechanical parts and extend the elevator's service life.

[0053] 8. High adaptability: It can be applied to various types and specifications of elevators and has a wide range of application prospects.

[0054] Additional aspects and advantages of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0055] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the description of the embodiments taken in conjunction with the following drawings, in which:

[0056] Figure 1 is a structural diagram of an elevator energy-saving device according to an embodiment of the present invention;

[0057] Figure 2 is a schematic diagram of multiple elevator devices connected in parallel according to an embodiment of the present invention;

[0058] Figure 3 is a schematic diagram of calculating elevator power generation using a DC meter according to an embodiment of the present invention;

[0059] Figure 4 is a wiring diagram of a high-voltage busbar, a bidirectional DC-DC converter, a high-voltage DC relay, and a contactor according to an embodiment of the present invention. Detailed Implementation

[0060] Embodiments of the present invention are described in detail below. Examples of these embodiments are illustrated in the accompanying drawings, wherein the same or similar reference numerals denote the same or similar elements or elements having the same or similar functions throughout. The embodiments described below with reference to the accompanying drawings are exemplary and intended to explain the present invention, and should not be construed as limiting the present invention.

[0061] This invention proposes an elevator energy-saving device that automatically matches the current path by controlling the bus voltage of the elevator inverter, prioritizing the current to flow through the energy-saving device's circuit. If the energy-saving device's power supply is insufficient, it automatically uses grid current. The process is automatically matched by the circuit, without affecting the elevator, eliminating the need to stop the elevator, and ensuring smooth elevator operation.

[0062] The elevator energy-saving device of the present invention will be described below with reference to Figures 1 to 4.

[0063] As shown in Figure 1, one end of the main contactor 2 is connected to the power grid 1, and the other end is connected to the elevator inverter 3. The elevator inverter 3 rectifies the connected power grid voltage and sends it to the elevator inverter bus 8. A high-frequency switch and a braking resistor 4 are connected in parallel and in series on the elevator inverter bus 8. An inverter 5 is connected to the rear end of the high-frequency switch and the braking resistor 4, and the inverter 5 is further connected to the elevator motor M. The motor M is further connected to the elevator car 6 and the counterweight 7.

[0064] In an embodiment of the present invention, the elevator frequency converter 3 may be a rectifier.

[0065] When the elevator generates electricity from its potential energy, the voltage of the elevator inverter bus 8 rises. When it rises to the first preset voltage, the braking resistor 4 works, switching on and off through a high-frequency switch to maintain the voltage at the first preset voltage.

[0066] The elevator energy-saving device 100 is connected in parallel to the elevator inverter bus. The elevator energy-saving device includes: battery pack 110, BMS battery management system 140, power control system, DC-DC power supply 120 and PLC controller 130.

[0067] Specifically, the DC-DC power supply 120 is connected to the BMS battery management system 140 and is connected in parallel to the elevator inverter bus 8. The PLC controller 130 is connected to the DC-DC power supply 120. Under the action of the PLC controller 130, the DC-DC power supply 120 transforms the voltage connected from the battery pack 110 to the second preset voltage, so as to control the voltage at the high voltage end to the second preset voltage.

[0068] In an embodiment of the present invention, the DC-DC power supply 120 can convert the voltage from 400V to 500-700V in two phases through the configured boost standard, specifically changing the voltage of the battery pack 110 terminal from 400V to the required target voltage of 580V.

[0069] Under the influence of the high and low voltage difference, when the elevator generates electricity, the voltage on the elevator inverter bus 8 will not rise to the first preset voltage, and the current will automatically flow to the elevator energy-saving device 100. When the elevator's power generation exceeds the threshold, after the elevator energy-saving device 100 is fully loaded, the excess electrical energy causes the voltage to rise to the first preset voltage, activating the braking resistor 4 to consume the excess electrical energy.

[0070] In embodiments of the present invention, the first preset voltage is 550~680V, ​​and the second preset voltage is 580V. It should be noted that the values ​​of the first and second preset voltages are not limited to the examples above and can be adjusted as needed.

[0071] The power control system refers to electronic components such as DC contactors, AC contactors, meters, and fuses, which are located in the electrical cabinet and are controlled by a PLC controller 130.

[0072] Specifically, referring to Figure 1, the mains voltage is typically 380V, and after rectification by the elevator inverter, the voltage of the elevator inverter bus 8 is 540V. When the elevator generates electricity, the voltage of the elevator inverter bus 8 will rise, generally reaching 700V. At this point, the braking resistor 4 will activate, switching on and off via a high-frequency switch to maintain the voltage at 700V. The elevator energy-saving device 100 is connected in parallel with the elevator inverter bus 8, and the DC-DC power supply 120 controls the voltage at the high-voltage end to 580V. Due to the high and low voltage difference, when the elevator generates electricity, the bus voltage will not rise to 700V, and the current will automatically flow directly to the energy-saving device. If the power generation is too large, after the elevator energy-saving device 100 is fully loaded, the excess energy will cause the voltage to rise to 700V, activating the braking resistor 4 and consuming the excess energy. Therefore, the elevator main circuit will not be affected, and the mains voltage will remain stable.

[0073] As shown in Figure 2, the elevator energy-saving device 100 is connected in parallel with multiple elevators. The elevator frequency converter bus 8 of each elevator is connected in parallel to the high-voltage end of the DC-DC power supply 120 after passing through a circuit breaker and a contactor.

[0074] Multiple elevators are connected in parallel, and the current from the elevators in power generation mode is directly transferred to the elevators in power consumption mode through the elevator energy-saving device 100.

[0075] When multiple elevators are generating or discharging power simultaneously, the battery pack 110 is used first. Once the battery pack 110's power level drops to a preset value, the grid power supply is then used. When an elevator is not in use, the current first flows to the DC-DC power supply 120 and then is stored in the battery pack 110.

[0076] Referring to Figure 2, a parallel elevator energy-saving device 100 is used, connecting three elevators (first, second, and third elevators) in parallel. These are connected in parallel to a DC-DC power supply 120 via a circuit breaker and contactor. With this circuit connection, one elevator generates electricity while the other consumes it; the current flows directly to the circuit of the elevator using the electricity. If no elevator is using electricity, the current flows to the DC-DC power supply and is stored in the battery pack 110. This is automatically executed by the circuit and requires no additional control.

[0077] In addition, the following situations also exist:

[0078] (1) The three elevators generate electricity at the same time, and the electrical energy is stored in the battery pack 110. The excess energy is consumed by the braking resistor 4.

[0079] (2) When all three elevators are in use at the same time, the 110V battery pack will be used first, and if the power is insufficient, it will be directly supplemented by the power grid.

[0080] (3) Two generators generate electricity and one consumer uses electricity. The generators give priority to the consumer, and any unused electricity is stored in battery pack 110.

[0081] As shown in Figure 3, the elevator energy-saving device 100 of this embodiment of the invention further includes one or more DC meters 200. Each DC meter 200 corresponds to an elevator and is connected between the elevator and the elevator energy-saving device 100, used to record the electricity exchanged between the corresponding single elevator and the elevator energy-saving device 100.

[0082] As shown in Figure 4, each DC meter 200 is connected to the negative terminal of the elevator inverter bus 8 and the negative terminal of the high voltage bus of the corresponding elevator through a shunt, and the high voltage DC relay is connected to the positive terminal of the elevator inverter bus 8 and the positive terminal of the high voltage bus of the corresponding elevator.

[0083] In embodiments of the present invention, the electrical energy data includes voltage, current, forward electrical energy, and reverse electrical energy, etc. It should be noted that the electrical energy data is not limited to the examples above and may include other data, which can be set as needed, and will not be elaborated further here.

[0084] Specifically, the power recording method for elevator equipment involves connecting each device to a shunt and a meter to record the incoming and outgoing power of the circuit. This includes voltage, current, forward energy, and reverse energy (d). Each elevator is connected to a corresponding DC meter 200 to accurately record the power exchanged between the elevator and the elevator energy-saving device 100.

[0085] The DC meter 200 records the electricity flowing into or out of the meter in one direction, including the electricity used from the battery pack 110 and the electricity generated by other devices that directly affects the elevator. This method avoids calculating the electricity consumed by the equipment. Using a one-way statistical method avoids bidirectional cancellation. If calculated using a one-way outflow method, internal losses and conversion efficiency are all included within the equipment; the electricity flowing out is the saved electricity. If calculated using a one-way inflow method, the actual power generation of the elevator can be calculated. The specific method used depends on the customer's needs.

[0086] The elevator energy-saving device of this invention controls the current flow by changing the bus voltage of the elevator frequency converter; it enables multiple devices to be connected and automatically matched, with the electricity generated by the generator elevator directly benefiting the power-consuming elevator; and it uses an electricity meter to record the outflow of electricity, avoiding interference from other factors (such as power loss). Compared to energy feedback systems, the energy storage type of this invention avoids grid fluctuations, resulting in higher energy efficiency and lower cost. Compared to capacitor-type devices, the energy storage type can store a large amount of electricity, achieving a higher energy saving ratio, wider applicability, and lower cost.

[0087] The device of this invention can better promote the development of elevator energy feedback system technology. Further cost reduction, improved compatibility and environmental adaptability, improved technical standards, and strengthened research and development are needed to enhance the quality and stability of energy feedback, thereby promoting its wider and more effective application in the elevator field and making a greater contribution to energy conservation and emission reduction.

[0088] The device of this invention can supply power to 2-3 elevators simultaneously, offering a significant cost advantage. Furthermore, it enables real-time power transfer between different elevator shafts, greatly increasing energy efficiency. It also features a comprehensive electricity billing system.

[0089] In the description of this specification, references to terms such as "one embodiment," "some embodiments," "example," "specific example," or "some examples," etc., indicate that a specific feature, structure, material, or characteristic described in connection with that embodiment or example is included in at least one embodiment or example of the invention. In this specification, the illustrative expressions of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in one or more embodiments or examples.

[0090] It will be readily understood by those skilled in the art that this invention includes any combination of the inventive description and specific embodiments outlined in the foregoing specification, as well as the various parts shown in the accompanying drawings. Due to space limitations and for the sake of brevity, not all of these combinations have been described in detail. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of this invention should be included within the scope of protection of this invention.

[0091] Although embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and should not be construed as limiting the present invention. Those skilled in the art can make changes, modifications, substitutions, and variations to the above embodiments within the scope of the present invention without departing from the principles and spirit of the invention. The scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. An elevator energy saving device, characterized by, One end of the main contactor is connected to the power grid, and the other end of the main contactor is connected to the elevator frequency converter. The elevator frequency converter rectifies the connected power grid voltage and sends it to the elevator frequency converter bus. A high-frequency switch and a braking resistor are connected in parallel and in series on the elevator frequency converter bus. An inverter is connected to the rear end of the high-frequency switch and the braking resistor. The inverter is further connected to the elevator. When the elevator generates electricity from potential energy, the voltage of the elevator inverter bus rises. When it rises to the first preset voltage, the braking resistor works and switches back and forth through the high-frequency switch to maintain the voltage at the first preset voltage. The elevator energy-saving device is connected in parallel to the elevator inverter bus and includes: a battery pack, a BMS battery management system, a power control system, a DC-DC power supply and a PLC controller. The DC-DC power supply is connected to the BMS battery management system and is connected in parallel to the elevator inverter bus. The PLC controller is connected to the DC-DC power supply. Under the action of the PLC controller, the DC-DC power supply transforms the voltage connected to the battery pack to the second preset voltage to control the voltage at the high voltage end at the second preset voltage. Under the influence of the high and low voltage difference, when the elevator generates electricity, the voltage on the elevator inverter bus will not rise to the first preset voltage, and the current will automatically flow to the elevator energy-saving device.

2. The elevator energy saving device of claim 1, wherein, The first preset voltage is 550~680V, ​​and the second preset voltage is 580V.

3. The elevator energy saving device of claim 1, wherein, When the elevator's power generation exceeds the threshold, the elevator energy-saving device, after being fully loaded, causes the voltage to rise to the first preset voltage, activating the braking resistor to consume the excess power.

4. The elevator energy saving device of claim 1, wherein, The elevator energy-saving device is connected in parallel with multiple elevators, and the elevator inverter bus of each elevator is connected in parallel to the high-voltage end of the DC-DC power supply after passing through a circuit breaker and a contactor.

5. The elevator energy saving device of claim 4, wherein, The elevator energy-saving device controls the current from the elevator in power generation mode to flow directly to the elevator in power consumption mode. When multiple elevators generate or discharge power simultaneously, the power of the battery pack is used first, and the power of the grid is used only after the power of the battery pack drops to a preset value. When the elevator is not in use, the current first flows to the DC-DC power supply and then is stored in the battery pack.

6. The elevator energy saving device according to claim 1 or 4, wherein It also includes one or more DC meters, each corresponding to an elevator and connected between the elevator and the elevator energy-saving device, for recording the electricity exchanged between the corresponding single elevator and the elevator energy-saving device.

7. The elevator energy saving device of claim 6, wherein, The electrical data includes: voltage, current, forward electrical energy, and reverse electrical energy.

8. The elevator energy saving device of claim 6, wherein, The DC meter is billed by recording the electricity flowing out or into the meter in one direction, including the electricity used from the battery pack and the electricity generated by other equipment that directly affects the elevator.

9. The elevator energy saving device of claim 6, wherein, Each of the DC meters is connected to the negative terminal of the elevator inverter bus and the negative terminal of the high-voltage bus of the corresponding elevator via a shunt, and the high-voltage DC relay is connected to the positive terminal of the elevator inverter bus and the positive terminal of the high-voltage bus of the corresponding elevator.

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