Elevator control system and method based on 750V direct-current power supply and elevator

Abstract

The invention relates to the technical field of elevator energy saving, and particularly discloses an elevator control system and method based on a 750V direct-current power supply and an elevator, and the system comprises the 750V direct-current power supply which is connected with a first direct-current frequency converter which comprises a first energy storage device; the power supply conversion module is connected with the 750V direct-current power supply and used for converting the 750V direct-current power supply to obtain a preset voltage power supply, and the voltage of the preset voltage power supply is lower than 750V; the preset voltage power supply is connected with the elevator master controller and used for providing input power for the elevator master controller. The elevator master controller is connected with the first electric energy regeneration device and used for sending a control instruction to the first electric energy regeneration device. And the first electric energy regeneration device inputs regenerated electric energy to the first direct-current frequency converter or the consumption resistor / commercial power. An existing elevator system is improved, and the elevator system based on the direct-current power supply is adopted, so that feedback energy can be fully and effectively utilized, the elevator operation energy consumption is reduced, and the elevator using economical efficiency is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator energy saving, and in particular to an elevator control system based on a 750V direct current power supply, an elevator control method and an elevator. Background Art

[0002] Over the past 100 years, due to its advantages in power transmission, AC has become the mainstream power supply method. The main power supplies on the market are AC380V or AC220V. In order to adapt to this power supply requirement, elevator systems are mainly AC input systems. From the perspective of the domestic elevator industry, there are very few DC powered elevator systems on the market.

[0003] Due to the development of power electronics technology and semiconductor technology, the promotion of energy-saving policies and the demand for high-quality energy development, the future power supply trend will gradually be the coexistence of AC and DC, and more and more local DC power supply microgrids will appear. This will promote the replacement of AC equipment with DC power supply equipment, and elevator equipment is no exception.

[0004] During the operation of the elevator, on the one hand, it consumes electric energy for operation; on the other hand, it also generates renewable energy. In the operation of existing elevators, the renewable energy is often directly consumed through a large-value resistor, or it is processed and fed back to the power grid for reuse. However, in actual application, if the renewable energy is directly consumed, it will cause energy waste; if the renewable energy is processed and then connected to the power grid, on the one hand, additional devices need to be configured, which increases the cost of the elevator; on the other hand, the energy connected to the power grid does not generate benefits for the owner, so it does not meet actual needs. Summary of the invention

[0005] In order to overcome the above-mentioned technical problems existing in the prior art, the embodiments of the present invention provide an elevator control system, an elevator control method and an elevator based on a 750V DC power supply. By improving the existing elevator system and adopting an elevator system based on a DC power supply, the feedback energy can be fully and effectively utilized, the energy consumption of the elevator operation can be reduced, and the economy of the elevator can be improved.

[0006] In order to achieve the above-mentioned purpose, an embodiment of the present invention provides an elevator control system based on a 750V DC power supply, the system comprising: a 750V DC power supply, connected to a first DC inverter, the first DC inverter comprising a first energy storage device; a power conversion module, connected to the 750V DC power supply, for converting the 750V DC power supply to obtain a preset voltage power supply, the voltage of the preset voltage power supply being lower than 750V; the preset voltage power supply is connected to an elevator main control, for providing input power to the elevator main control; the elevator main control is connected to the first DC inverter and a first electric energy regeneration device, for issuing a control instruction to the first electric energy regeneration device according to power supply demand; the first electric energy regeneration device inputs regenerated electric energy to the first DC inverter based on the control instruction or inputs the regenerated electric energy to a consumption resistor / mains power.

[0007] Preferably, the elevator master control is also used to: determine whether the power in the first energy storage device reaches a preset power value; if so, control the first DC inverter to cut off the 750V DC power supply and connect to the first energy storage device; otherwise, control the first DC inverter to connect to the 750V DC power supply.

[0008] Preferably, the first electric energy regeneration device is also connected to a second DC inverter of a second elevator, and the second DC inverter includes a second energy storage device.

[0009] Preferably, the control instruction is issued to the first electric energy regeneration device according to the power supply demand, including: judging whether the first DC converter has a power supply demand; if the first DC converter has a power supply demand, generating a first control instruction to output the regenerated electric energy to the first DC converter; if the first DC converter does not have a power supply demand, judging whether the second DC converter has a power supply demand: if the second DC converter has a power supply demand, generating a second control instruction to output the regenerated electric energy to the second DC converter; if the second DC converter does not have a power supply demand, generating a third control instruction to output the regenerated electric energy to a consumption resistor / mains power.

[0010] Preferably, the second elevator comprises a second electric energy regeneration device, the first electric energy regeneration device and the second electric energy regeneration device are connected to a regeneration bus, and the first DC inverter and the second DC inverter are connected to the regeneration bus.

[0011] Preferably, a first switch device is provided between the first DC inverter and the regeneration bus, and a second switch device is provided between the second DC inverter and the regeneration bus.

[0012] Preferably, the elevator master control is also used to: generate regenerative electric energy prediction information of the regeneration bus based on the first electric energy regeneration device and the second electric energy regeneration device; if both the first DC inverter and the second DC inverter have power supply requirements, obtain the first demand prediction information of the first DC inverter and the second demand prediction information of the second DC inverter; match the regenerative electric energy prediction information with the first demand prediction information and the second demand prediction information to determine the corresponding similarity; determine the most similar DC inverter with the highest similarity based on the similarity; and control the switching device corresponding to the most similar DC inverter to turn on.

[0013] Preferably, the elevator master control is also used to: determine whether any one of the first switch device and the second switch device is turned on; if so, control the first power regeneration device and / or the second power regeneration device to output the regenerated electric energy to the regeneration bus; otherwise, control the first power regeneration device and / or the second power regeneration device to output the regenerated electric energy to the consumption resistor / mains power.

[0014] Correspondingly, the present invention also provides an elevator control method, which is applied to the elevator control system based on the 750V DC power supply described in the embodiment of the present invention, the system includes a first DC inverter and a first electric energy regeneration device, and the method includes: controlling the first DC inverter to be connected to the 750V DC power supply; determining whether the first DC inverter has a power supply demand; if so, controlling the first electric energy regeneration device to output the regenerated electric energy to the first DC inverter; otherwise, controlling the first electric energy regeneration device to output the regenerated electric energy to the consumption resistor / mains power.

[0015] On the other hand, the present invention further provides an elevator, comprising the elevator control system based on a 750V DC power supply as described in an embodiment of the present invention.

[0016] Through the technical solution provided by the present invention, the present invention has at least the following technical effects: By improving the existing elevator system, the existing AC input power supply is adjusted to a DC input power supply, and a DC inverter is directly connected to the DC input power supply to realize the DC drive of the elevator system; on the other hand, the 750V DC power supply is converted into a lower voltage DC power supply through the power conversion module, so as to meet the power supply requirements of other electrical components in the current elevator system. Based on this, the purpose of configuring only one DC power supply to power the entire elevator system is achieved, which reduces the number of power supplies configured in the elevator system and reduces the elevator cost; Furthermore, through the above-mentioned direct current improvement, the regenerated electric energy generated by the electric energy regeneration device can be directly input into the DC inverter for use, thereby effectively reducing the energy consumption during the operation of the elevator and improving the economic efficiency of the elevator.

[0017] Other features and advantages of the embodiments of the present invention will be described in detail in the subsequent detailed description. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings are used to provide a further understanding of the embodiments of the present invention and constitute a part of the specification. Together with the following specific implementations, they are used to explain the embodiments of the present invention, but do not constitute a limitation on the embodiments of the present invention. In the accompanying drawings:

[0019] Figure 1 is a schematic diagram of the structure of an elevator control system based on a 750V DC power supply provided by an embodiment of the present invention;

[0020] Figure 2 1 is a schematic diagram of the structure of an elevator control system based on a 750V DC power supply provided by a second embodiment of the present invention;

[0021] Figure 3 is a structural schematic diagram of an elevator control system based on a 750V DC power supply provided by a third embodiment of the present invention;

[0022] Figure 4 It is a specific implementation flow chart of the elevator control method provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0023] The specific implementation of the embodiment of the present invention is described in detail below in conjunction with the accompanying drawings. It should be understood that the specific implementation described here is only used to illustrate and explain the embodiment of the present invention, and is not used to limit the embodiment of the present invention.

[0024] The terms "system" and "network" in the embodiments of the present invention can be used interchangeably. "Multiple" means two or more than two. In view of this, "multiple" can also be understood as "at least two" in the embodiments of the present invention. "And / or" describes the association relationship of associated objects, indicating that three relationships can exist. For example, A and / or B can represent: A exists alone, A and B exist at the same time, and B exists alone. In addition, the character " / ", unless otherwise specified, generally indicates that the previous and subsequent associated objects are in an "or" relationship. In addition, it should be understood that in the description of the embodiments of the present invention, the words "first", "second", etc. are only used to distinguish the purpose of description, and cannot be understood as indicating or implying relative importance, nor can they be understood as indicating or implying order.

[0025] See also Figure 1An embodiment of the present invention provides an elevator control system based on a 750V DC power supply, the system comprising: a 750V DC power supply connected to a first DC inverter, the first DC inverter comprising a first energy storage device; a power conversion module connected to the 750V DC power supply, for converting the 750V DC power supply to obtain a preset voltage power supply, the voltage of the preset voltage power supply being lower than 750V; the preset voltage power supply is connected to an elevator main control, for providing input power to the elevator main control; the elevator main control is connected to the first DC inverter and a first electric energy regeneration device, for issuing a control instruction to the first electric energy regeneration device according to a power supply demand; the first electric energy regeneration device inputs regenerated electric energy to the first DC inverter based on the control instruction or inputs the regenerated electric energy to a consumption resistor / mains power.

[0026] In a possible implementation, the existing elevator system is improved so that the elevator system can be applied to a DC input power supply on the one hand, and can directly utilize feedback energy on the other hand to further reduce energy consumption and improve economic efficiency. Specifically, firstly, a 750V DC power supply is used as an input power supply and directly input into a first DC inverter, which is a DC inverter of the current elevator, and the first DC inverter is configured with a first energy storage device, such as a battery or a super capacitor.

[0027] During the application process, the first DC inverter directly uses the 750V DC power supply for processing to drive the traction machine to operate, thereby realizing the operation of the elevator. At the same time, the 750V DC power supply is converted into a preset voltage power supply with a lower voltage through the power conversion module, and is used to provide DC input power for other elevator electrical components. For example, the preset voltage power supply is 310V. Since many electrical components in the existing elevator system are powered by 220V AC, by converting the 750V DC power supply into a 310V DC power supply, it can correspond to 220V AC, so that the electrical components in the existing elevator system can also adapt to the operation of the DC power supply without large-scale replacement, thereby greatly improving the system compatibility.

[0028] During use, the elevator converts the remaining kinetic energy during the operation of the elevator into feedback energy through the first electric energy regeneration device, and based on the control of the elevator master control, feeds back to the first DC inverter for reuse of the feedback energy, or outputs it to the consumption resistor / mains power to consume it.

[0029] In the embodiment of the present invention, by replacing the input power supply of the elevator system with a DC input power supply and matching it with a DC inverter, it is possible to effectively adapt to the DC power supply in the existing usage scenario and operate at a lower electricity cost; at the same time, the renewable energy generated during the operation of the elevator can be directly utilized and input into the DC inverter. The DC inverter can directly use the generated renewable energy for the operation of the elevator to reduce the energy consumption during the operation, or use it to charge the energy storage device, thereby reducing energy consumption due to subsequent operation or providing energy for other elevator electrical components.

[0030] In the prior art, energy storage devices often have a fixed limit on the number of charge and discharge cycles. Therefore, if the energy storage device is directly connected to a DC inverter and an electric energy regeneration device, frequent charge and discharge operations will occur, resulting in a significant reduction in the service life of the energy storage device.

[0031] Based on the above technical problems, in an embodiment of the present invention, the elevator master control is also used to: determine whether the power in the first energy storage device reaches a preset power value; if so, control the first DC inverter to cut off the 750V DC power supply and connect to the first energy storage device; otherwise, control the first DC inverter to connect to the 750V DC power supply.

[0032] In a possible implementation, the elevator master monitors the power in the first energy storage device in real time and determines whether it has reached a preset power value. For example, it can be stipulated that the power in the energy storage device needs to be disconnected and continuous charging operation only when the power in the energy storage device can be discharged to 20%. During the charging process, only when it is monitored that the power in the energy storage device reaches a preset power value (for example, 40%), the first DC inverter is controlled to cut off the 750V DC power supply and connect to the first energy storage device. Otherwise, the first DC inverter is controlled to be connected to the 750V DC power supply.

[0033] In the embodiment of the present invention, the above control method can effectively reduce the charging and discharging frequency of the energy storage device, and at the same time can effectively utilize the feedback energy in the energy storage device, thereby greatly improving the service life of the energy storage device and reducing the use cost of the elevator.

[0034] However, in actual application, the feedback energy of the elevator is generated based on the second half of the elevator operation, that is, the elevator is already in a state of deceleration and preparing to stop, and the DC inverter may not have a power supply demand at this time. Based on cost and space considerations, the capacity of the energy storage device configured for the DC inverter is not large, which may lead to waste of the feedback regenerative electric energy.

[0035] In order to fully utilize the feedback energy / regenerated electric energy, in an embodiment of the present invention, the first electric energy regeneration device is also connected to a second DC inverter of a second elevator, and the second DC inverter includes a second energy storage device.

[0036] Of course, it should be noted that, based on the above principle, technicians can think that the first power regeneration device can also be connected to the third DC inverter...Nth DC inverter, where N is a positive integer, so that the regenerated electric energy generated by the first power regeneration device can be more fully utilized. In the actual application process, the elevator master intelligently and dynamically adjusts the output end of the first power regeneration device to output the generated regenerated electric energy to the elevator with power supply demand, thereby realizing full utilization of the regenerated electric energy.

[0037] In an embodiment of the present invention, the elevator master control is also used to: determine whether the first DC inverter has a power supply demand; if the first DC inverter has a power supply demand, control the first electric energy regeneration device to output regenerated electric energy to the first DC inverter; if the first DC inverter has no power supply demand, determine whether the second DC inverter has a power supply demand: if the second DC inverter has a power supply demand, control the first electric energy regeneration device to output regenerated electric energy to the second DC inverter; if the second DC inverter has no power supply demand, control the first electric energy regeneration device to output regenerated electric energy to the consumption resistor / mains power.

[0038] In a possible implementation, after the regenerated electric energy is generated, the elevator master control preferentially applies it to the operation of the elevator. Specifically, it first determines whether the first DC inverter has a power supply demand, which includes but is not limited to the power supply demand for driving the traction machine and the power supply demand for charging the energy storage device. If the first DC inverter needs power supply, the first power regeneration device is controlled to output the regenerated electric energy to the first DC inverter.

[0039] When it is determined that the first DC inverter does not need power supply, it is further determined whether other connected DC inverters have power supply demand. In this embodiment, other DC inverters are DC inverters configured for other elevators that are located in the same physical area as the current elevator and connected in parallel with the current elevator. When any of the other DC inverters needs power supply, the first power regeneration device is controlled to output power to the corresponding DC inverter for its operation, thereby reducing energy consumption during elevator operation and improving the utilization rate of regenerated energy. If no DC inverter has power supply demand, the regenerated power is output to the consumption resistor / mains power.

[0040] In the embodiment of the present invention, by connecting each electric energy regeneration device to the DC inverters of multiple elevators, the generated regenerative electric energy can be configured and used more reasonably, thereby effectively reducing the waste of regenerative electric energy, reducing the electric energy consumption of the entire elevator system, and improving the economic efficiency of the elevator.

[0041] However, in actual application, if the power regeneration device of each elevator is individually connected to the DC inverters of all other elevators, a large number of connections will be generated, which will increase the workload and create potential safety threats, thus causing trouble for technicians.

[0042] See also Figure 2 In an embodiment of the present invention, the second elevator includes a second electric energy regeneration device, the first electric energy regeneration device and the second electric energy regeneration device are connected to a regeneration bus, and the first DC inverter and the second DC inverter are connected to the regeneration bus.

[0043] In a possible implementation, a regeneration bus is provided in a multi-elevator system, and the power regeneration devices of all elevators are connected to the regeneration bus. On the other hand, the DC inverter of each elevator is also connected to the regeneration bus, thereby achieving full utilization of the regenerated electric energy generated by each power regeneration device, greatly reducing wiring and improving safety of use.

[0044] However, in actual applications, directly connecting the DC inverter and the power regeneration device through the regeneration bus may cause mutual crosstalk between different DC inverters, which may lead to power waste and even safety accidents.

[0045] Further, to solve the above technical problems, please refer to Figure 3 In an embodiment of the present invention, a first switch device is provided between the first DC inverter and the regeneration bus, and a second switch device is provided between the second DC inverter and the regeneration bus.

[0046] It should be noted that, based on the above technical content, those skilled in the art can conceive that when the regeneration bus is connected to the Nth DC inverter, an Nth switch device is configured for it, which will not be elaborated herein.

[0047] By configuring a corresponding switch device for each DC inverter, during the operation of the elevator, the elevator master control can control the corresponding switch device to close or open according to the actual needs of the current elevator, thereby effectively ensuring the safety of the elevator operation.

[0048] In actual application, different elevators have different power supply requirements during operation, which are reflected in the different power supply current intensity and power supply duration required by elevators at different operation stages. For elevators, stable power supply is crucial to the stability of their operation. Unstable power supply may lead to a significant reduction in the elevator riding experience and even cause safety accidents.

[0049] In order to minimize the impact of regenerative power supply on the stability of the entire elevator power supply, in an embodiment of the present invention, the elevator master control is also used to: generate regenerative power prediction information of the regeneration bus based on the first power regeneration device and the second power regeneration device; if both the first DC inverter and the second DC inverter have power supply needs, obtain the first demand prediction information of the first DC inverter and the second demand prediction information of the second DC inverter; match the regenerative power prediction information with the first demand prediction information and the second demand prediction information to determine the corresponding similarity; determine the most similar DC inverter with the highest similarity based on the similarity; and control the switch device corresponding to the most similar DC inverter to turn on.

[0050] In one possible implementation, after multiple electric energy regeneration devices are connected to the regeneration bus, regeneration electric energy prediction information on the regeneration bus is generated based on the historical output capacity of each electric energy regeneration device, or based on the actual operating conditions of each elevator. The regeneration electric energy prediction information includes but is not limited to supply current prediction information and power supply duration prediction information of the regeneration electric energy. In actual application, if both the first DC inverter and the second DC inverter have power supply requirements, in an embodiment of the present invention, the power supply requirements of the DC inverter include a driving power supply requirement for driving the elevator operation and a charging power supply requirement for charging the energy storage device.

[0051] At this time, in order to reduce the impact of using regenerative electric energy on the control stability of the elevator, the first demand forecast information of the first DC inverter and the second demand forecast information of the second DC inverter are obtained. Specifically, the driving power supply demand can be determined according to the current elevator operation instruction, and the corresponding charging power supply demand can be determined according to whether the first energy storage device needs to be charged, thereby determining the power supply current forecast information and power supply duration forecast information of the first DC inverter; based on the same principle, the relevant forecast information of the second DC inverter can be determined. At this time, the above-mentioned regenerative electric energy forecast information is matched with the first demand forecast information and the second demand forecast information to determine the first similarity between the first demand forecast information and the regenerative electric energy forecast information and the second similarity between the second demand forecast information and the regenerative electric energy forecast information. Finally, according to the above similarity, the most similar DC inverter with the highest similarity is determined, and the most similar DC inverter is controlled to turn on the corresponding switch device to receive the generated regenerative electric energy, so as to minimize the impact of the regenerative electric energy on the overall operation stability of the elevator.

[0052] In the embodiment of the present invention, the regenerated electric energy is output to the most matching DC inverter according to the actual situation of each elevator, so as to greatly reduce the impact of using regenerated electric energy to power the elevator, improve the stability of the elevator power supply, improve the elevator use experience, and improve the safety of elevator use.

[0053] In an embodiment of the present invention, the elevator master control is also used to: determine whether any one of the first switch device and the second switch device is turned on; if so, control the first power regeneration device and / or the second power regeneration device to output the regenerated electric energy to the regeneration bus; otherwise, control the first power regeneration device and / or the second power regeneration device to output the regenerated electric energy to the consumption resistor / mains power.

[0054] Specifically, the elevator master control also controls the output of all power regeneration devices to avoid the occurrence of safety accidents. Specifically, the closed state of all switch devices connected to the regeneration bus is monitored. If any closed switch device is monitored, the power regeneration device is controlled to output the regenerated electric energy to the regeneration bus. Otherwise, it is determined that there are no elevators with power supply needs in the entire elevator system. Therefore, the power regeneration device is controlled to output the regenerated electric energy to the consumption resistor / mains power to avoid safety risks caused by current cross-talk, thereby improving the safety of elevator use.

[0055] See also Figure 4 Based on the same inventive concept, an embodiment of the present invention provides an elevator control method, which is applied to an elevator control system based on a 750V DC power supply according to an embodiment of the present invention, wherein the system includes a first DC inverter and a first electric energy regeneration device, and the method includes: S10) controlling the first DC inverter to be connected to a 750V DC power supply; S20) determining whether the first DC inverter has a power supply demand; S31) If yes, control the first electric energy regeneration device to output the regenerated electric energy to the first DC inverter; S32) Otherwise, control the first electric energy regeneration device to output the regenerated electric energy to the consumption resistor / mains power.

[0056] Furthermore, an embodiment of the present invention also provides an elevator, comprising an elevator control system based on a 750V DC power supply according to an embodiment of the present invention.

[0057] The optional implementation modes of the embodiments of the present invention are described in detail above in conjunction with the accompanying drawings. However, the embodiments of the present invention are not limited to the specific details in the above implementation modes. Within the technical concept of the embodiments of the present invention, various simple modifications can be made to the technical scheme of the embodiments of the present invention, and these simple modifications all belong to the protection scope of the embodiments of the present invention.

[0058] It should also be noted that the various specific technical features described in the above specific embodiments can be combined in any suitable manner without contradiction. To avoid unnecessary repetition, the embodiments of the present invention will not further describe various possible combinations.

[0059] Those skilled in the art can understand that all or part of the steps in the above-mentioned embodiment method can be completed by instructing the relevant hardware through a program, and the program is stored in a storage medium, including a number of instructions to enable a single-chip microcomputer, a chip or a processor to execute all or part of the steps of the method described in each embodiment of the present application. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0060] In addition, various implementations of the embodiments of the present invention may be arbitrarily combined, and as long as they do not violate the concept of the embodiments of the present invention, they should also be regarded as the contents disclosed in the embodiments of the present invention.

Claims

1. An elevator control system based on a 750V DC power supply, characterized in that: The system comprises: A 750V DC power supply connected to a first DC frequency converter, wherein the first DC frequency converter includes a first energy storage device; A power conversion module, connected to the 750V DC power supply, for converting the 750V DC power supply to obtain a preset voltage power supply, wherein the voltage of the preset voltage power supply is lower than 750V; The preset voltage power supply is connected to the elevator main control and is used to provide input power to the elevator main control; The elevator master control is connected to the first DC inverter and the first electric energy regeneration device, and is used to issue control instructions to the first electric energy regeneration device according to power supply requirements; The first electric energy regeneration device inputs the regenerated electric energy to the first DC inverter or inputs the regenerated electric energy to a consumption resistor / commercial power based on the control instruction.

2. The system according to claim 1, characterized in that The elevator master control is also used for: Determining whether the power in the first energy storage device reaches a preset power value; If yes, control the first DC inverter to cut off the 750V DC power supply and connect it to the first energy storage device; Otherwise, the first DC inverter is controlled to be connected to the 750V DC power supply.

3. The system according to claim 1, characterized in that The first electric energy regeneration device is also connected to a second DC frequency converter of a second elevator, and the second DC frequency converter includes a second energy storage device.

4. The system according to claim 3, characterized in that The sending of a control instruction to the first electric energy regeneration device according to the power supply demand includes: Determining whether the first DC inverter has a power supply demand; If the first DC inverter has a power supply demand, generating a first control instruction to output the regenerated electric energy to the first DC inverter; If the first DC inverter does not have a power supply demand, determine whether the second DC inverter has a power supply demand: If the second DC inverter has a power supply demand, generating a second control instruction to output the regenerated electric energy to the second DC inverter; If the second DC inverter has no power supply demand, a third control instruction is generated to output the regenerated electric energy to the consumption resistor / commercial power.

5. The system according to claim 3, characterized in that The second elevator includes a second electric energy regeneration device, the first electric energy regeneration device and the second electric energy regeneration device are connected to a regeneration bus, and the first DC inverter and the second DC inverter are connected to the regeneration bus.

6. The system according to claim 5, characterized in that A first switch device is provided between the first DC frequency converter and the regeneration bus, and a second switch device is provided between the second DC frequency converter and the regeneration bus.

7. The system according to claim 6, characterized in that The elevator master control is also used for: generating regenerative electric energy prediction information of the regenerative bus based on the first electric energy regeneration device and the second electric energy regeneration device; If both the first DC inverter and the second DC inverter have power supply demand, obtaining first demand forecast information of the first DC inverter and second demand forecast information of the second DC inverter; Matching the renewable electric energy forecast information with the first demand forecast information and the second demand forecast information to determine corresponding similarities; Determining the most similar DC inverter with the highest similarity according to the similarity; The switch device corresponding to the most similar DC inverter is controlled to be turned on.

8. The system according to claim 6, characterized in that The elevator master control is also used for: determining whether any one of the first switch device and the second switch device is turned on; If so, controlling the first electric energy regeneration device and / or the second electric energy regeneration device to output the regenerated electric energy to the regeneration bus; Otherwise, the first power regeneration device and / or the second power regeneration device are controlled to output the regenerated electric energy to the consumption resistor / mains power.

9. An elevator control method, characterized in that: The method is applied to an elevator control system based on a 750V DC power supply according to any one of claims 1 to 8, wherein the system comprises a first DC inverter and a first electric energy regeneration device, and the method comprises: Controlling the first DC inverter to be connected to a 750V DC power supply; Determining whether the first DC inverter has a power supply demand; If so, controlling the first electric energy regeneration device to output the regenerated electric energy to the first DC inverter; Otherwise, the first electric energy regeneration device is controlled to output the regenerated electric energy to the consumption resistor / mains power.

10. An elevator, characterized in that: The elevator comprises an elevator control system based on a 750V DC power supply according to any one of claims 1-8.

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