An elevator energy saving device

Abstract

The application provides an elevator energy-saving device which is connected in parallel with an elevator frequency converter bus, comprising a battery pack, a BMS battery management system, 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 with the BMS battery management system and connected in parallel with the elevator frequency converter bus, the PLC controller is connected with the DC-DC direct-current power supply, the DC-DC direct-current power supply transforms the voltage input from the battery pack to the second preset voltage under the action of the PLC controller, so that the voltage of the high-voltage end is controlled at the second preset voltage; under the action of the high-low voltage difference, when the elevator generates electricity, the voltage on the elevator frequency converter bus will not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device. The application has the characteristics of energy-saving efficiency, reduction of operation cost, smooth operation, reduction of power grid pressure and prolongation of equipment life.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elevator equipment, in particular to an elevator energy-saving device. BACKGROUND

[0002] Elevator (elevator) is a kind of vertical transportation equipment for transporting people or goods, and is a common transportation equipment in people's daily life. The following introduces several common elevator energy-saving devices:

[0003] (1) Elevator energy feedback device

[0004] Energy feedback technology is gradually mature. By recycling and reusing the regenerated electric energy generated during the operation of the elevator, the energy consumption is effectively reduced. At the same time, the application of intelligent control system also makes the operation of the elevator more efficient, which can flexibly adjust the operation mode according to the actual use, and reduce unnecessary energy consumption. In addition, the use of new materials in elevator components, such as lighter and stronger alloy materials, reduces the weight of the elevator itself, thereby reducing the energy demand during operation.

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

[0006] 1. Cost problem. The initial investment of energy feedback system is relatively high, which limits its large-scale application to some extent, especially for the modification of some old elevators, and the cost factor becomes one of the obstacles.

[0007] 2. Compatibility problem. Different brands and models of elevators have differences in electrical characteristics, which may cause poor compatibility between the energy feedback system and the elevator system, affecting its normal operation and energy-saving effect.

[0008] 3. Environmental adaptability. In some special environmental conditions, such as high temperature, high humidity, and strong electromagnetic interference, the performance of the energy feedback system may be affected, and problems such as stability decline may occur.

[0009] 4. Energy feedback quality. Although the electric energy can be fed back, the quality of the electric energy may fluctuate, which may cause certain interference to the power grid, and further optimization of control strategy is needed to improve.

[0010] 5. Technical standards are not unified. The quality of energy feedback system products on the market is uneven, and there is a lack of unified and clear technical standards and specifications, which brings certain difficulties to users in selection and use.

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

[0012] Capacitor-based elevator energy-saving devices are a technology that utilizes capacitors to store electrical energy, aiming to improve the energy efficiency of elevators. Here is a detailed description of the development status, defects, and shortcomings of capacitor-based elevator energy-saving device technology:

[0013] Capacitor-based elevator energy-saving device technology has seen some development in recent years. As concerns about energy efficiency have increased, the elevator industry has also actively explored energy-saving technologies. Capacitor-based energy-saving devices recover and store energy during elevator operation, then release this energy when needed to reduce elevator energy consumption. Some elevator manufacturers have begun integrating capacitor-based energy-saving devices into their products and have achieved some energy-saving effects. In addition, research institutions and scholars are constantly exploring and improving capacitor-based energy-saving technology to improve its performance and reliability.

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

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

[0016] 2. Charging and discharging efficiency issues: The charging and discharging process of capacitors has certain energy loss, which affects the overall efficiency of the energy-saving device. In addition, frequent charging and discharging cycles may also affect the life of the capacitor.

[0017] 3. Higher cost: Compared with traditional elevator systems, capacitor-based energy-saving devices have higher costs. This includes the cost of capacitors themselves and the cost of related control systems and circuits. Higher costs 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 needed to ensure their reliability and performance in different environments.

[0019] 5. Maintenance and management: Capacitor-based 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 elevator automatic rescue devices can be traced back to the 1990s, when some elevator manufacturers began to research and produce elevator power failure automatic rescue devices. These devices mainly use batteries as backup power sources when the elevator loses power, and the batteries can provide temporary power to the elevator, allowing the elevator to run to the nearest floor and open the door to allow passengers to safely exit.

[0022] With the continuous progress of technology, the performance and function of elevator automatic rescue devices have been continuously improved. Currently, the elevator automatic rescue devices on the market have a variety of functions, such as automatic detection of elevator failure, automatic start of rescue program, automatic charging, etc. At the same time, some new types of elevator automatic rescue devices also use more advanced technologies, such as super capacitor, lithium, etc. The application of these technologies not only improves the performance and reliability of the elevator automatic rescue device, but also reduces its cost and maintenance difficulty.

[0023] The technology currently still has some defects and deficiencies:

[0024] 1. Limited scope of application: elevator automatic rescue devices usually only provide temporary power support when the elevator is powered off or fails, and cannot solve the problem of long-term operation or major failure of the elevator.

[0025] 2. Reliability needs to be improved: elevator automatic rescue devices are a kind of mechatronics equipment, whose reliability is affected by many factors, such as life, circuit failure, mechanical component damage, etc. If the elevator automatic rescue device fails, it may lead to rescue failure, endangering the safety of passengers.

[0026] 3. High maintenance cost: elevator automatic rescue devices need regular maintenance and maintenance, such as replacement, inspection of circuit, cleaning of mechanical components, etc. These maintenance work needs professional technical personnel and equipment, and the maintenance cost is high.

[0027] 4. High environmental requirements: elevator automatic rescue devices have high requirements on the environment, such as temperature, humidity, dust, etc. If the environmental conditions are bad, it may affect the performance and reliability of the elevator automatic rescue device.

[0028] 5. Lack of unified standards: Currently, the standards and specifications of elevator automatic rescue devices are not perfect enough, and there are great differences in performance, function, reliability, etc. between elevator automatic rescue devices produced by different manufacturers, which brings certain difficulties to the selection and use of users. SUMMARY

[0029] The purpose of the present invention is to at least solve one of the said technical defects.

[0030] To this end, one object of the present invention is to propose an elevator energy-saving device to solve the problems mentioned in the background art and overcome the deficiencies in the prior art.

[0031] In order to achieve the above-mentioned purpose, the embodiment of the present application provides an elevator energy-saving device, one end of a main contactor is connected to a power grid, the other end of the main contactor is connected to an elevator frequency converter, the elevator frequency converter rectifies the power grid voltage and transmits the rectified voltage to an elevator frequency converter bus, the elevator frequency converter bus is connected in parallel with a high-frequency switch and a braking resistor connected in series; an inverter is connected to the rear end of the high-frequency switch and the braking resistor, and the inverter is further connected to an elevator;

[0032] When the elevator generates power, the voltage of the elevator frequency converter bus rises, and when the voltage rises to a first preset voltage, the braking resistor works, and the high-frequency switch is turned on and off to maintain the voltage at the first preset voltage;

[0033] The elevator energy-saving device connected in parallel to the elevator frequency converter bus comprises a battery pack, a BMS battery management system, 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 battery management system and connected in parallel to the elevator frequency converter bus, the PLC controller is connected to the DC-DC direct current power supply, and the DC-DC direct current power supply transforms the voltage from the battery pack to the second preset voltage under the action of the PLC controller, so as to control the voltage of the high-voltage end at the second preset voltage.

[0034] Under the action of the high-low voltage difference, when the elevator generates power, the voltage on the elevator frequency converter bus will not rise to the first preset voltage, and the current automatically flows to the elevator energy-saving device.

[0035] Preferably, according to any of the above-mentioned schemes, the first preset voltage is 550-680v, and the second preset voltage is 580V.

[0036] Preferably, according to any of the above-mentioned schemes, when the power generation of the elevator exceeds a threshold value, the elevator energy-saving device is fully loaded, the excess power makes the voltage rise to the first preset voltage, and the braking resistor is started to consume the excess power.

[0037] Preferably, according to any of the above-mentioned schemes, the elevator energy-saving device is connected in parallel to multiple elevators, and the elevator frequency converter bus of each elevator is connected in parallel to the high-voltage end of the DC-DC direct current power supply through a circuit breaker and a contactor.

[0038] Preferably, according to any of the above-mentioned schemes, the current of the power generation state elevator is directly controlled by the elevator energy-saving device to flow to the elevator for power consumption.

[0039] When multiple elevators generate power or discharge power at the same time, the power of the battery pack is used preferentially, and the power supply of the power grid is used after the power of the battery pack decreases to a preset value.

[0040] When the elevator is in a non-use state, the current first flows to the DC-DC power supply and then is stored in the battery pack.

[0041] Preferably, according to any of the above solutions, further comprising one or more DC ammeters, said DC ammeters corresponding to the elevators one by one, connected between the elevators and the elevator energy-saving device, for recording the power data exchanged between the corresponding single elevator and the elevator energy-saving device.

[0042] Preferably, according to any of the above solutions, said power data includes: voltage, current, forward power and reverse power.

[0043] Preferably, according to any of the above solutions, the charging mode of said DC ammeter adopts to record the power of one-way outflow or one-way inflow ammeter, including the power used from the battery pack and the power directly generated from other equipment acting on the elevator.

[0044] Preferably, according to any of the above solutions, each said DC ammeter is connected to the negative pole of the elevator frequency converter bus and the negative pole of the high-voltage bus of the corresponding elevator through a shunt, and the high-voltage DC relay is connected to the positive pole of the elevator frequency converter bus and the positive pole of the high-voltage bus of the corresponding elevator.

[0045] Compared with the prior art, the present application has the following beneficial effects:

[0046] 1. Energy-saving and efficient: the potential energy and kinetic energy generated during the operation of the elevator can be recycled and converted into electrical energy for storage, which can be used for subsequent operation of the elevator, thereby significantly reducing the energy consumption of the elevator.

[0047] 2. Reduce operating costs: through energy saving, reduce power consumption, save a lot of electricity charges for the operation of the elevator.

[0048] 3. Smooth operation: helps to improve the smoothness of the elevator operation, reduces the impact when starting and stopping, and improves the comfort of passengers.

[0049] 4. Reduce the pressure of the power grid: during the peak of electricity consumption, the energy storage battery pack can supply power to the elevator, reduce the dependence on the power grid, and reduce the load pressure of the power grid.

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

[0051] 6. Emergency backup: in the event of a power outage or other emergency, the energy storage battery pack can provide some power support to ensure the basic operation of the elevator and ensure passenger safety.

[0052] 7. Prolong the service life of the equipment: smooth operation and reasonable energy management help to reduce the wear and tear of elevator mechanical parts and prolong the service life of the elevator.

[0053] 8. Adaptability: can be applied to various types and specifications of elevators, with wide application prospects.

[0054] Additional aspects and advantages of the present application will be in part apparent and in part pointed out below. BRIEF DESCRIPTION OF DRAWINGS

[0055] The above and / or additional aspects and advantages of the present application will become apparent and be readily appreciated from the following description, including the accompanying drawings.

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

[0057] Figure 2 A schematic diagram of parallel connection of multiple elevator devices according to an embodiment of the present application;

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

[0059] Figure 4 A wiring diagram of a high-voltage bus, bidirectional DC-DC, high-voltage DC relay and contactor according to an embodiment of the present application. DETAILED DESCRIPTION

[0060] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, in which the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are intended to explain the present application, and cannot be understood as limiting the present application.

[0061] The present application proposes an elevator energy-saving device, which automatically matches the current path by controlling the elevator frequency converter bus voltage, preferentially uses the energy-saving device circuit, and automatically uses the grid current if the energy-saving device power supply is insufficient. The process is automatically matched by the circuit, which does not affect the elevator, does not need to stop the elevator, and does not cause the elevator to run to be stuck.

[0062] The following will be described in conjunction with Figures 1 to 4 The elevator energy-saving device according to an embodiment of the present application is described.

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

[0064] In an embodiment of the present application, the elevator frequency converter 3 can adopt a rectifier.

[0065] When the elevator generates potential energy, the voltage of the elevator frequency converter bus 8 rises, and when it rises to the first preset voltage, the braking resistor 4 works, and the high-frequency switch is turned on and off to maintain the voltage at the first preset voltage.

[0066] The elevator energy-saving device 100 is connected in parallel to the elevator frequency converter bus. The elevator energy-saving device comprises a battery pack 110, a BMS battery management system 140, a power control system, a DC-DC direct current power supply 120, and a PLC controller 130.

[0067] Specifically, the DC-DC direct current power supply 120 is connected to the BMS battery management system 140 and connected in parallel to the elevator frequency converter bus 8, and the PLC controller 130 is connected to the DC-DC direct current power supply 120. Under the action of the PLC controller 130, the DC-DC direct current power supply 120 changes the voltage input 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 application, the DC-DC direct current power supply 120 can be changed from 400V to 500-700V by configuring a boost standard, and specifically, the voltage at the end of the battery pack 110 is changed from 400V to the target voltage 580V.

[0069] Under the action of the high-low voltage difference, when the elevator generates electricity, the voltage on the elevator frequency converter 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 generated electricity of the elevator exceeds the threshold value, the elevator energy-saving device 100 is fully loaded, and the excess electricity makes the voltage rise to the first preset voltage, and the braking resistor 4 is started to consume the excess electricity.

[0070] In an embodiment of the present application, the first preset voltage is 550-680v, and the second preset voltage is 580V. It should be noted that the values of the first preset voltage and the second preset voltage are not limited to the above examples, and can be adjusted as needed.

[0071] The power control system refers to the electronic components such as DC contactor, AC contactor, ammeter, fuse, etc. which are in the electrical cabinet and are controlled by the PLC controller 130.

[0072] In particular, referring to Figure 1 , the grid voltage is usually 380V, and the voltage of the elevator frequency converter bus 8 is 540V after rectification by the elevator frequency converter. When the elevator generates potential energy, the voltage of the elevator frequency converter bus 8 will rise, and when it reaches 700V, the braking resistor 4 will work, and the voltage will be maintained at 700V through high-frequency switching. The elevator energy-saving device 100 is connected in parallel on the elevator frequency converter bus 8, and the high-voltage end voltage is controlled at 580V through the DC-DC power supply 120. Through the high-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 generated power is too large, after the elevator energy-saving device 100 is fully loaded, the excess power will cause the voltage to rise to 700V, starting the braking resistor 4 to consume excess power. Therefore, the elevator main circuit will not be affected, and the grid voltage will be very stable.

[0073] As shown in Figure 2 , the elevator energy-saving device 100 is connected in parallel with multiple elevators, and 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 through a circuit breaker and a contactor.

[0074] Using the parallel mode of multiple elevators, the current of the generating state elevator is directly guided to the power-consuming elevator through the elevator energy-saving device 100 control.

[0075] When multiple elevators generate electricity or discharge electricity at the same time, the battery pack 110 is used first, and when the battery pack 110 drops to the preset value, the grid power supply is used. When there is no elevator in the power-consuming state, the current first flows to the DC-DC power supply 120, and then is saved to the battery pack 110.

[0076] Referring to Figure 2 , three elevators (first elevator, second elevator, and third elevator) are connected in parallel with the elevator energy-saving device 100, and are connected in parallel to the DC-DC power supply 120 through a circuit breaker and a contactor. After connecting through this circuit, one elevator generates electricity, and another elevator consumes electricity, and the current directly flows to the power-consuming elevator line. If there is no power-consuming elevator, the current flows to the DC-DC and is saved to the energy storage battery pack 110. Through the circuit, automatic execution is not required for additional control.

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

[0078] (1) Three elevator devices generate electricity at the same time, and the electrical energy is stored in the battery pack 110, and the excess is consumed by the braking resistor 4;

[0079] (2) three elevator equipment power supply at the same time, priority to use battery pack 110 power, not enough power grid directly to supplement;

[0080] (3) two power generation and one power supply, power generation priority to power supply, not consumed to the battery pack 110.

[0081] As Figure 3 shown, the elevator energy-saving device 100 of the embodiment of the application further comprises: one or more DC ammeters 200. The DC ammeter 200 corresponds to one elevator, and is connected between the elevator and the elevator energy-saving device 100, and is used to record the power data exchanged between the corresponding single elevator and the elevator energy-saving device 100.

[0082] As Figure 4 shown, each DC ammeter 200 is connected to the negative pole of the elevator frequency converter bus 8 of the corresponding elevator and the negative pole of the high-voltage bus through a shunt, and the high-voltage DC relay is connected to the positive pole of the elevator frequency converter bus 8 of the corresponding elevator and the positive pole of the high-voltage bus.

[0083] In the embodiment of the application, the power data includes: voltage, current, forward power and reverse power, etc. It should be noted that the power data is not limited to the above examples, and can also include other data, which is set as needed, and will not be described here.

[0084] Specifically, the power recording mode of the elevator equipment can record the in-out power of the line through single equipment access to the shunt and the ammeter. The in-out power includes voltage, current, forward power and reverse power. Each elevator corresponds to one DC ammeter 200, which accurately records the power exchanged between the single elevator and the elevator energy-saving device 100.

[0085] The charging mode of the DC ammeter 200 adopts the power recorded by the one-way outflow or one-way inflow ammeter, including the power used from the battery pack 110 and the power directly acting on the elevator from other equipment. This way can avoid calculating the power consumed by the equipment power consumption. The one-way statistical method can avoid mutual offset. If the single outflow method is used for calculation, the internal loss, conversion efficiency and other factors of the equipment can be included in the equipment. The power out is the power saved. If the one-way inflow method is used for calculation, the actual power generation of the elevator can be calculated. The specific way is selected according to the customer situation.

[0086] The elevator energy-saving device of the embodiment of the present application controls the current direction by changing the mode of controlling the frequency converter elevator frequency converter bus voltage; multiple devices are connected, automatically matched, and the power generated by the power generation elevator directly acts on the power consumption elevator; the electric meter charging mode is adopted to record the outflow power, and the interference of other factors (such as power loss) is avoided. Compared with the energy feedback system, the energy storage type can avoid causing the fluctuation of the power grid, has higher energy-saving efficiency and lower cost. Compared with the capacitor type, the energy storage type can store a large amount of power, has high power saving rate, is suitable for wider application scenarios, and has lower cost.

[0087] The device of the present application can better promote the development of the elevator energy feedback system technology, further reduce the cost, improve the compatibility and environmental adaptability, perfect the technical standards, strengthen the research and development to improve the quality and stability of energy feedback, thereby promoting its more extensive and effective application in the elevator field, and making greater contribution to the energy-saving and emission-reduction cause.

[0088] The device of the present application can supply 2-3 elevators at the same time, has absolute advantages in cost, and greatly increases the power saving efficiency through instant transmission of power between different elevators. There is a perfect electric meter charging system.

[0089] In the description of the present application, the description of the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present application, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0090] It is not difficult for those skilled in the art to understand that the present application includes any combination of the above description of the summary and specific embodiment parts and the parts shown in the drawings, which are limited in length and are described briefly in the specification. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.

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

Claims

1. An elevator energy-saving device, characterized in that, 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 a 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. The elevator energy-saving device is connected in parallel with multiple elevators. The elevator frequency converter 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. The current of the elevator in the power generation state is directly flowed to the elevator in the power consumption state through the control of the elevator energy-saving device. 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. The elevator energy-saving device 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; the billing method of the DC meters is to record 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. Among them, the calculation based on the one-way outflow method includes the factors of equipment internal consumption and conversion efficiency inside the equipment, and the electricity that goes out is the electricity saved; the calculation based on the one-way inflow method calculates the actual elevator power generation.

2. The elevator energy-saving device as described in claim 1, characterized in that, The first preset voltage is 550-680V, ​​and the second preset voltage is 580V.

3. The elevator energy-saving device as described in claim 1, characterized in that, 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 as described in claim 1, characterized in that, The electrical data includes: voltage, current, forward electrical energy, and reverse electrical energy.

5. The elevator energy-saving device as described in claim 1, characterized in that, 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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