A DC elevator system and a DC elevator

Abstract

The application relates to the technical field of elevator energy-saving control, and particularly discloses a direct-current elevator system and a direct-current elevator, which comprises a direct-current input power supply, a direct-current frequency converter and a direct-current traction machine; the direct-current input power supply is used for providing direct-current input for the direct-current frequency converter; the direct-current frequency converter is connected with the direct-current traction machine and is used for driving the direct-current traction machine; a first semiconductor voltage reduction module is connected with the direct-current input power supply, is used for executing a voltage reduction operation and outputs a first direct-current voltage; a plurality of first direct-current components are connected with the first semiconductor voltage reduction module, and each first direct-current component operates based on the first direct-current voltage; a second semiconductor voltage reduction module is connected with the first semiconductor voltage reduction module, is used for executing a voltage reduction operation and outputs a second direct-current voltage; a plurality of second direct-current components are connected with the second semiconductor voltage reduction module, and each second direct-current component operates based on the second direct-current voltage; the first direct-current voltage is lower than the voltage of the direct-current input, and the second direct-current voltage is lower than the first direct-current voltage.

Description

TECHNICAL FIELD

[0001] The present application relates to the technical field of elevator energy-saving control, in particular to a direct-current elevator system and a direct-current elevator. BACKGROUND

[0002] In the modern high-rise buildings and urbanization process, the energy consumption problem of elevator as a vertical transportation tool is increasingly concerned. The traditional alternating current elevator system is composed of alternating current equipment or components. In the use process, on the one hand, the alternating current elevator system consumes alternating current energy; on the other hand, the direct current regenerative power generated by the elevator in the running process cannot be directly utilized, so it is often directly consumed by consuming resistance, or converted into alternating current and sent to the power grid through conversion equipment.

[0003] However, in the actual application process, whether the consumed power or the power sent to the power grid can be utilized by the elevator again, so it has certain limitations in energy consumption and cannot meet the demand for higher energy efficiency.

[0004] With the continuous development of new energy technology in recent years, direct current power supply is more and more applied to life, combined with the characteristics of high efficiency and energy saving of direct current elevator system, so it is gradually paid attention to. The direct current elevator system usually adopts frequency conversion speed regulation technology and energy feedback technology. These technologies can dynamically adjust the power frequency and voltage of the motor according to the actual operation demand of the elevator, so as to realize energy saving. However, there is no direct current elevator system at present, so it cannot meet the market demand. SUMMARY

[0005] In order to overcome the above technical problems existing in the prior art, the embodiment of the present application provides a direct current elevator system and a direct current elevator. By direct current improvement to the traditional elevator, the elevator is allowed to run in the most economical way, so as to effectively reduce the running cost of the elevator and meet the user demand.

[0006] To achieve the above object, the embodiment of the present application provides a direct-current elevator system, which comprises a direct-current input power supply, a direct-current frequency converter and a direct-current traction machine; the direct-current input power supply is connected with the direct-current frequency converter and used for providing direct-current input for the direct-current frequency converter; the direct-current frequency converter is connected with the direct-current traction machine and used for driving the direct-current traction machine; a first semiconductor voltage reduction module is connected with the direct-current input power supply and used for performing voltage reduction operation and outputting a first direct-current voltage; a plurality of first direct-current components are connected with the first semiconductor voltage reduction module, and each first direct-current component operates based on the first direct-current voltage; a second semiconductor voltage reduction module is connected with the first semiconductor voltage reduction module and used for performing voltage reduction operation and outputting a second direct-current voltage; a plurality of second direct-current components are connected with the second semiconductor voltage reduction module, and each second direct-current component operates based on the second direct-current voltage; the first direct-current voltage is lower than the voltage of the direct-current input, and the second direct-current voltage is lower than the first direct-current voltage.

[0007] Preferably, the direct-current elevator system further comprises a regenerative energy device connected with the direct-current traction machine and used for generating regenerative energy; the regenerative energy device is further connected with an energy storage device, and the energy storage device is connected with the direct-current frequency converter.

[0008] Preferably, the first direct-current component comprises a master control module, which is used for judging whether a driving signal of the direct-current frequency converter is acquired; if yes, controlling the regenerative energy device to output the regenerative energy to the direct-current frequency converter; otherwise, controlling the regenerative energy device to output the regenerative energy to the energy storage device.

[0009] Preferably, the master control module is further used for acquiring a current period; if the current period is in a preset daytime period, controlling the direct-current input power supply, the regenerative energy device and the energy storage device to supply power for the direct-current frequency converter based on a first control strategy, and in the first control strategy, the energy storage device is preferentially controlled to supply power for the direct-current frequency converter; if the current period is in a preset nighttime period, controlling the direct-current input power supply, the regenerative energy device and the energy storage device to supply power for the direct-current frequency converter based on a second control strategy, and in the second control strategy, the direct-current input power supply is preferentially controlled to supply power for the direct-current frequency converter.

[0010] Preferably, the power supply of the DC input power supply, the renewable energy device and the energy storage device for the DC inverter based on the first control strategy comprises: acquiring the connection state and the current power of the energy storage device; in the case that the energy storage device and the DC inverter are in the connected state, if the current power is less than the first preset power, controlling the DC inverter to be connected with the DC input power supply and disconnected with the energy storage device; in the case that the energy storage device and the DC inverter are in the disconnected state, if the current power is greater than the second preset power, controlling the DC inverter to be connected with the energy storage device and disconnected with the DC input power supply, and the first preset power is less than the second preset power.

[0011] Preferably, the power supply of the DC input power supply, the renewable energy device and the energy storage device for the DC inverter based on the second control strategy comprises: in the case that the energy storage device and the DC inverter are in the connected state, if the current power is less than the third preset power, controlling the DC inverter to be connected with the DC input power supply and disconnected with the energy storage device, and the third preset power is greater than the first preset power and less than the second preset power; in the case that the energy storage device and the DC inverter are in the disconnected state, if the current power is greater than the fourth preset power, controlling the DC inverter to be connected with the energy storage device and disconnected with the DC input power supply, and the fourth preset power is greater than the second preset power.

[0012] Preferably, the master control module is further configured to: acquire historical renewable data of the renewable energy device; generate a generation curve of renewable energy in a unit time based on the historical renewable data; acquire an energy consumption curve of total energy consumption in the unit time; determine the first preset power, the second preset power, the third preset power and the fourth preset power based on the generation curve and the energy consumption curve; generate a first control strategy based on the first preset power and the second preset power, and generate a second control strategy based on the third preset power and the fourth preset power.

[0013] Preferably, the determining the first preset power, the second preset power, the third preset power and the fourth preset power based on the generation curve and the energy consumption curve comprises: obtaining a daytime charging and discharging frequency threshold and a nighttime charging and discharging frequency threshold, the daytime charging and discharging frequency threshold being greater than the nighttime charging and discharging frequency threshold; in a case that the current period is in the preset daytime period, determining the first preset power and the second preset power based on the daytime charging and discharging frequency threshold, the generation curve and the energy consumption curve, the renewable energy being completely consumed in the preset daytime period according to the first preset power; in a case that the current period is in the preset nighttime period, determining the third preset power and the fourth preset power based on the nighttime charging and discharging frequency threshold, the generation curve and the energy consumption curve, the renewable energy being completely consumed in the preset nighttime period according to the third preset power.

[0014] Preferably, the master module is further configured to: obtain a first output current of the first semiconductor step-down module and a second output current of the second semiconductor step-down module; determine whether at least one of the first output current, the first DC voltage, the second output current and the second DC voltage is abnormal; if yes, cut off the corresponding first semiconductor step-down module and / or second semiconductor step-down module, and output corresponding alarm information.

[0015] Correspondingly, the application also provides a DC elevator, which comprises the DC elevator system provided by the application.

[0016] By means of the technical scheme provided by the application, the application has at least the following technical effects:

[0017] By improving the traditional AC elevator system, using the DC elevator driven based on the DC power supply, replacing all electrical components in the elevator system with DC driving components, and running the entire elevator with a DC input power combined with multiple semiconductor step-down modules, the operation of the entire elevator can be supported, the cost of the elevator is reduced, and the renewable energy can be directly used for the operation of the elevator, thereby improving the economy of the operation of the elevator.

[0018] Other features and advantages of the embodiments of the application will be described in detail in the following specific embodiments. BRIEF DESCRIPTION OF DRAWINGS

[0019] The accompanying drawings are included to provide a further understanding of the embodiments of the application, and constitute a part of the specification, and are used together with the following specific embodiments to explain the embodiments of the application, but do not constitute a limitation on the embodiments of the application. In the drawings:

[0020] Figure 1is a structural schematic diagram of a direct-current elevator system provided by an embodiment of the present application;

[0021] Figure 2 is a structural schematic diagram of a direct-current elevator system provided by a second embodiment of the present application. DETAILED DESCRIPTION

[0022] The specific embodiments of the embodiments of the present application are described in detail below with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are merely intended to illustrate and explain the embodiments of the present application, and are not intended to limit the embodiments of the present application.

[0023] The terms "system" and "network" in the embodiments of the present application can be used interchangeably. "Multiple" means two or more, and therefore "multiple" can also be understood as "at least two" in the embodiments of the present application. "And / or", which describes the association relationship of the associated objects, means that there can be three relationships, for example, A and / or B can mean that there are three cases of A alone, A and B together, and B alone. In addition, the character " / ", if not specially stated, generally represents an "or" relationship between the associated objects. In addition, it should be understood that in the description of the embodiments of the present application, the terms "first", "second", etc. are used only for the purpose of distinguishing the description, and cannot be understood as indicating or implying relative importance, nor can it be understood as indicating or implying order.

[0024] The embodiments of the present application provide a direct-current elevator system, which comprises: a direct-current input power supply, a direct-current frequency converter and a direct-current traction machine; the direct-current input power supply is connected with the direct-current frequency converter, and is used to provide direct-current input for the direct-current frequency converter; the direct-current frequency converter is connected with the direct-current traction machine, and is used to drive the direct-current traction machine; a first semiconductor voltage reduction module is connected with the direct-current input power supply, and is used to perform a voltage reduction operation and output a first direct-current voltage; a plurality of first direct-current components are connected with the first semiconductor voltage reduction module, and each first direct-current component operates based on the first direct-current voltage; a second semiconductor voltage reduction module is connected with the first semiconductor voltage reduction module, and is used to perform a voltage reduction operation and output a second direct-current voltage; a plurality of second direct-current components are connected with the second semiconductor voltage reduction module, and each second direct-current component operates based on the second direct-current voltage; the first direct-current voltage is lower than the voltage of the direct-current input, and the second direct-current voltage is lower than the first direct-current voltage.

[0025] Please refer to Figure 1In a possible implementation, the existing elevator system is directly reformed, specifically, the input power supply of the elevator is replaced from the original 380V alternating current power supply or 220V alternating current power supply to a direct current input power supply, for example, to a 700-750V direct current input power supply, a direct current frequency converter is connected with the direct current input power supply, the direct current frequency converter drives the direct current traction machine to move according to the direct current input, to realize the normal operation of the elevator, then a first semiconductor voltage reduction module is connected with the direct current input power supply, to perform voltage reduction on the direct current input power supply, to reduce the direct current input power supply to a first direct current voltage, for example, to 310V direct current input, the first direct current voltage is used to supply power to a plurality of first direct current components, including but not limited to the main control cabinet of the elevator, the safety protection device, the car lighting, the shaft lighting and the like, that is, all the above components are replaced from the original alternating current components to direct current components, to meet the development demand of new technologies.

[0026] Further, since there are other components driven by other voltage specifications in the elevator, a second semiconductor voltage reduction module is further configured, connected with the first semiconductor voltage reduction module, to reduce the voltage to a second direct current voltage, for example, to 110V direct current input, to drive second direct current components such as the safety protection device and the brake, in the embodiment of the present application, a third semiconductor voltage reduction module is further configured, connected with the second semiconductor voltage reduction module, to reduce the second direct current voltage to a third direct current voltage, for example, to 24V direct current input, and to provide power input for low-voltage direct current components such as the control circuit board, the sensor, the elevator door machine and the external calling device. In the embodiment of the present application, the above semiconductor voltage reduction module is a voltage reduction module based on the third generation semiconductor material (gallium nitride or silicon carbide), which has good electric energy conversion efficiency and higher safety.

[0027] In the embodiment of the present application, by directly improving the traditional elevator system, all the electrical components of the entire elevator system are composed of direct current components, so that only one direct current input power supply is configured for the elevator, combined with a plurality of semiconductor voltage reduction modules, the normal operation of the entire elevator can be realized, and it is no longer necessary to configure corresponding power supplies for different voltage driven components of the elevator, thereby effectively reducing the configuration cost of the elevator, at the same time, the electric energy conversion efficiency can be effectively improved by the semiconductor voltage reduction module, the operation cost of the elevator is reduced, and the higher use safety and the switching characteristics of the semiconductor voltage reduction module can further improve the use safety of the elevator system.

[0028] Please refer to Figure 2 In the embodiment of the present application, the direct current elevator system further comprises a regenerative energy device connected with the direct current traction machine, for generating regenerative energy, the regenerative energy device is further connected with an energy storage device, and the energy storage device is connected with the direct current frequency converter.

[0029] In the embodiment of the present application, by connecting the renewable energy device and the energy storage device, the direct current renewable energy generated by the renewable energy device can be directly stored and used for subsequent use of the elevator, thereby effectively reducing the operation cost of the elevator and improving the economy of the elevator use.

[0030] In the embodiment of the present application, the first direct current component comprises a master control module, which is configured to: determine whether the driving signal of the direct current frequency converter is acquired; if yes, control the renewable energy device to output the renewable energy to the direct current frequency converter; otherwise, control the renewable energy device to output the renewable energy to the energy storage device.

[0031] In a possible implementation, the master control module is arranged in a master control cabinet, and the renewable energy device is further directly connected with the direct current frequency converter. During the operation of the elevator, the master control module determines whether the driving signal of the direct current frequency converter is acquired. For example, in an embodiment, the elevator receives an external call signal of a landing, and thus needs to immediately control the elevator car to go to the landing. At this time, the driving signal is sent, which means that the input of electric energy is needed to drive the direct current traction machine to move the elevator car to the landing. At this time, the master control module controls the renewable energy device to directly output the renewable energy to the direct current frequency converter for use, thereby effectively reducing the energy consumption during the operation of the elevator. In the remaining time, the elevator is parked at the landing and in standby state or the elevator is under heavy load down or light load up. At this time, if the renewable energy is generated, since the direct current frequency converter does not need to input current, the master control module controls the renewable energy device to output the renewable energy to the energy storage device for storage for subsequent use.

[0032] In actual application, the energy storage device such as a lithium battery module or a power battery pack has a high configuration cost, and the current battery has a fixed number of charge and discharge times. Therefore, if the charge and discharge are frequently performed, the service life of the battery is reduced, and the economy of the energy storage device for energy storage is reduced.

[0033] In the embodiment of the present application, the master control module is further configured to: acquire a current time period; if the current time period is in a preset daytime period, control the direct current input power supply, the renewable energy device and the energy storage device to supply power to the direct current frequency converter based on a first control strategy, wherein the energy storage device is preferentially controlled to supply power to the direct current frequency converter in the first control strategy; if the current time period is in a preset night period, control the direct current input power supply, the renewable energy device and the energy storage device to supply power to the direct current frequency converter based on a second control strategy, wherein the direct current input power supply is preferentially controlled to supply power to the direct current frequency converter in the second control strategy.

[0034] In a possible implementation, a current period is acquired first, if the current period is in a preset daytime period, at this time, the electricity price is at a high level, and therefore the DC input power supply, the renewable energy device and the energy storage device are controlled to supply power to the DC frequency converter based on a first control strategy, in the embodiment of the application, the controlling the DC input power supply, the renewable energy device and the energy storage device to supply power to the DC frequency converter based on the first control strategy comprises: acquiring a connection state and a current power of the energy storage device; in the case that the energy storage device and the DC frequency converter are in a connection state, if the current power is less than a first preset power, the DC frequency converter is controlled to be connected to the DC input power supply and disconnected from the energy storage device; in the case that the energy storage device and the DC frequency converter are in a disconnection state, if the current power is greater than a second preset power, the DC frequency converter is controlled to be connected to the energy storage device and disconnected from the DC input power supply, the first preset power is less than the second preset power.

[0035] Specifically, the electricity price is higher in the daytime, and therefore it is more economical and has a lower operation cost to preferentially use the electric energy in the energy storage device to drive the elevator. The connection state and the current power of the energy storage device are acquired first, if the energy storage device is connected to the DC frequency converter, that is, the energy storage device is in a discharging state at this time, if it is monitored that the current power is less than a first preset power, for example, the first preset power is 20%, the DC frequency converter is controlled to be connected to the DC input power supply and disconnected from the energy storage device, so as to avoid greater damage to the energy storage device in the case of low power, at this time, the energy storage device enters a charging mode; if the energy storage device is in a disconnection state from the DC frequency converter, that is, the energy storage device is in a charging mode at this time, the current power of the energy storage device is monitored, and when the current power is greater than a second preset power, for example, the second preset power is 40%, the DC frequency converter is controlled to be connected to the energy storage device and disconnected from the DC input power supply, so as to preferentially use the electric energy in the energy storage device to supply power, and realize more economical operation of the elevator.

[0036] In the embodiment of the application, the energy storage device is preferentially configured to supply power for the elevator operation in the daytime high electricity price period, so as to improve the economy of the elevator operation and reduce the operation cost; and by using different power switching thresholds in the charging and discharging modes of the energy storage system, the frequency of charging and discharging of the energy storage system can be effectively avoided, and the service life of the energy storage system is improved.

[0037] On the other hand, if the current period is in a preset night period, that is, the electricity price is low at this time, the external DC input power supply can be preferentially used to supply power, so as to reduce the use frequency of the energy storage system and improve the service life thereof.

[0038] In the embodiment of the present application, the second control strategy is used to control the DC input power supply, the renewable energy device and the energy storage device to supply power to the DC inverter, including: when the energy storage device and the DC inverter are in a connected state, if the current power is less than a third preset power, the third preset power being greater than the first preset power and less than the second preset power, the DC inverter is controlled to be connected to the DC input power supply and disconnected from the energy storage device; when the energy storage device and the DC inverter are in a disconnected state, if the current power is greater than a fourth preset power, the fourth preset power being greater than the second preset power, the DC inverter is controlled to be connected to the energy storage device and disconnected from the DC input power supply.

[0039] In a possible implementation, when the energy storage device and the DC inverter are in a connected state, i.e., the energy storage device is in a discharging mode, if the current power of the energy storage device is less than a third preset power, for example, the third preset power is 30%, the DC inverter is controlled to be connected to the external DC input power supply and disconnected from the energy storage device; when the energy storage device and the DC inverter are in a disconnected state, i.e., the energy storage device is in a charging mode, the DC inverter is controlled to be connected to the energy storage device and disconnected from the DC input power supply only when the current power of the energy storage device is greater than a fourth preset power, for example, the fourth preset power is 60%, so as to achieve the best balance between the use of low-cost power and the maximization of the service life of the energy storage device.

[0040] In the embodiment of the present application, different control strategies are used to switch the input power supply of the elevator at different time stages, so as to comprehensively balance the use of low-cost power and the maximization of the service life of the energy storage device, meet the actual needs of users, and improve the user experience.

[0041] In actual application, for different elevators, their use conditions are different, the amount of renewable energy generated thereby is different, and the economic performance that can be achieved thereby is also different, so the above fixed control strategy does not achieve the best economic performance.

[0042] In the embodiment of the present application, the master control module is further configured to: acquire historical regeneration data of the renewable energy device; generate a generation curve of the renewable energy in a unit time based on the historical regeneration data; acquire an energy consumption curve of total energy consumption in the unit time; determine the first preset power, the second preset power, the third preset power and the fourth preset power based on the generation curve and the energy consumption curve; generate a first control strategy based on the first preset power and the second preset power, and generate a second control strategy based on the third preset power and the fourth preset power.

[0043] In a possible implementation, in order to achieve the maximum operation cost reduction effect and optimize the service life of the energy storage device, historical renewable energy data of the renewable energy device is acquired, a generation curve of the renewable energy device in a unit time, for example, 1-7 days, is determined according to the data, at this time, an energy consumption curve of the total energy consumed by the elevator in the unit time, that is, an energy consumption curve of the entire elevator in the unit time, is acquired, at this time, the energy use economy is accurately analyzed according to the generation curve and the energy consumption curve, to determine the optimal first preset power, the second preset power, the third preset power and the fourth preset power, and the corresponding first control strategy and the second control strategy are generated according to the determined optimal first preset power, the second preset power, the third preset power and the fourth preset power, so as to achieve the above technical effects.

[0044] In the embodiment of the present application, the first preset power, the second preset power, the third preset power and the fourth preset power are determined based on the generation curve and the energy consumption curve, including: acquiring a daytime charging and discharging frequency threshold and a nighttime charging and discharging frequency threshold, the daytime charging and discharging frequency threshold being greater than the nighttime charging and discharging frequency threshold; in the case that the current period is in the preset daytime period, determining the first preset power and the second preset power based on the daytime charging and discharging frequency threshold, the generation curve and the energy consumption curve, the renewable energy being completely consumed in the preset daytime period according to the first preset power; in the case that the current period is in the preset nighttime period, determining the third preset power and the fourth preset power based on the nighttime charging and discharging frequency threshold, the generation curve and the energy consumption curve, the renewable energy being completely consumed in the preset nighttime period according to the third preset power.

[0045] In a possible implementation, first, a daytime charging and discharging frequency threshold and a nighttime charging and discharging frequency threshold are acquired, for example, the above two thresholds are thresholds set by the technician in advance according to the acceptable charging and discharging frequency of the energy storage device, wherein the daytime charging and discharging frequency threshold is greater than the nighttime charging and discharging frequency threshold, so as to preferentially consume the electric energy in the energy storage device in the daytime and preferentially reduce the charging and discharging frequency of the energy storage device at night.

[0046] According to the period in which the elevator runs, if in the preset daytime period, the renewable energy generation rate in the preset daytime period is determined according to the generation curve, according to the data, the charging rate of the energy storage device can be determined, and the energy consumption rate in the energy storage device can be determined in combination with the energy consumption curve, thereby the next charging time interval of the energy storage device can be determined, based on this, the optimal first preset power and the second preset power are determined according to the above daytime charging and discharging frequency threshold, and the renewable energy is completely consumed in the preset daytime period based on the first preset power;

[0047] And, if in a preset night period, based on the same principle, the best third preset power and the fourth preset power are determined, and on the basis of the third preset power, the renewable energy is completely consumed in the preset night period. Therefore, according to the optimal power setting value, the optimal control scheme can be generated, the optimal elevator operation economic performance and the optimal energy storage device charging and discharging times are realized, the service life is guaranteed, and the actual demand of the user is met.

[0048] In actual use, compared with a traditional switching power supply or a relay device, the output current and voltage of each semiconductor voltage reduction module can be monitored in real time, elevator abnormalities can be analyzed and timely prompts can be given, thereby improving the safety of the elevator.

[0049] In the embodiment of the application, the master control module is further configured to: acquire a first output current of the first semiconductor voltage reduction module and a second output current of the second semiconductor voltage reduction module; determine whether at least one of the first output current, the first direct current voltage, the second output current and the second direct current voltage is abnormal; and if so, cut off the corresponding first semiconductor voltage reduction module and / or second semiconductor voltage reduction module and output corresponding alarm information.

[0050] In a possible implementation, during the operation of the elevator, the first output current of the first semiconductor voltage reduction module and the second output current of the second semiconductor voltage reduction module are acquired, and whether an abnormality exists is determined according to the first output current, the first direct current voltage, the second output current and the second direct current voltage. For example, in the first embodiment, if it is monitored that the output current of a semiconductor voltage reduction module is significantly greater than the normal output current, it can be determined that an abnormal electrical component exists in the electrical components loaded by the semiconductor voltage reduction module, and therefore the semiconductor voltage reduction module is immediately cut off and corresponding alarm information is immediately output. In the second embodiment, if it is monitored that the direct current voltage across a semiconductor voltage reduction module is significantly high, it can be determined that the semiconductor voltage reduction module is abnormal, and therefore the semiconductor voltage reduction module is immediately cut off and corresponding alarm information is output in order to protect the electrical components from being damaged.

[0051] In the embodiment of the application, by configuring the semiconductor voltage reduction module, the current monitoring and voltage monitoring functions of the semiconductor voltage reduction module itself are utilized, and without the need to configure an additional monitoring device, the current and voltage of each electrical component during the operation of the elevator can be monitored, and abnormalities can be found in time, thereby effectively improving the safety of the operation of the elevator.

[0052] Further, the embodiment of the application further provides a direct current elevator, which comprises the direct current elevator system according to the embodiment of the application.

[0053] The optional embodiments of the embodiments of the application are described in detail above in combination with the drawings, but the embodiments of the application are not limited to the specific details in the above-described embodiments. Within the technical concept range of the embodiments of the application, the technical solutions of the embodiments of the application can be variously and simply modified, and these simple modifications all belong to the protection range of the embodiments of the application.

[0054] In addition, it should be noted that each specific technical feature described in the above specific embodiments can be combined in any appropriate manner without contradiction. In order to avoid unnecessary repetition, various possible combinations are not described again by the embodiments of the application.

[0055] In addition, any combination of the various different embodiments of the embodiments of the application can also be made, as long as it does not deviate from the idea of the embodiments of the application, and it should also be considered as disclosed by the embodiments of the application.

Claims

1. A DC elevator system, characterized in that: The DC elevator system includes: DC input power supply, DC inverter and DC traction machine; The DC input power supply is connected to the DC converter and is used to provide DC input for the DC converter; The DC inverter is connected to the DC traction machine and is used to drive the DC traction machine; a first semiconductor step-down module, connected to the DC input power supply, configured to perform a step-down operation and output a first DC voltage; a plurality of first DC components connected to the first semiconductor step-down module, each of the first DC components operating based on the first DC voltage; a second semiconductor buck module, connected to the first semiconductor buck module, configured to perform a buck operation and output a second DC voltage; a plurality of second DC components connected to the second semiconductor step-down module, each second DC component operating based on the second DC voltage; The first DC voltage is lower than the voltage of the DC input, and the second DC voltage is lower than the first DC voltage; the DC elevator system further includes a regenerative energy device connected to the DC traction machine for generating regenerative energy; The renewable energy device is further connected to an energy storage device, which is connected to the DC inverter. The first DC component includes a main control module, which is used to: Determining whether a driving signal of the DC inverter is obtained; If so, controlling the renewable energy device to output the renewable energy to the DC inverter; Otherwise, the renewable energy device is controlled to output the renewable energy to the energy storage device.

2. The DC elevator system according to claim 1, characterized in that: The main control module is also used for: Get the current time period; If the current time period is a preset daytime period, controlling the DC input power supply, the renewable energy device, and the energy storage device to supply power to the DC inverter based on a first control strategy, wherein the energy storage device is preferentially controlled to supply power to the DC inverter in the first control strategy; If the current time period is in the preset night time period, the DC input power supply, the renewable energy device and the energy storage device are controlled to power the DC converter based on the second control strategy, and the DC input power supply is preferentially controlled to power the DC converter in the second control strategy.

3. The DC elevator system according to claim 2, characterized in that: The controlling the DC input power supply, the regenerative energy device, and the energy storage device to supply power to the DC inverter based on the first control strategy includes: Obtaining the connection status and current power of the energy storage device; When the energy storage device is connected to the DC converter, if the current power is less than a first preset power, controlling the DC converter to connect to the DC input power supply and disconnect from the energy storage device; When the energy storage device and the DC inverter are in a disconnected state, if the current power is greater than a second preset power, the DC inverter is controlled to connect to the energy storage device and disconnect from the DC input power supply, and the first preset power is less than the second preset power.

4. The DC elevator system according to claim 3, characterized in that: The controlling the DC input power supply, the regenerative energy device, and the energy storage device to supply power to the DC inverter based on the second control strategy includes: When the energy storage device is connected to the DC inverter, if the current power is less than a third preset power, controlling the DC inverter to connect to the DC input power supply and disconnect from the energy storage device, wherein the third preset power is greater than the first preset power and less than the second preset power; When the energy storage device and the DC inverter are in a disconnected state, if the current power is greater than a fourth preset power, the DC inverter is controlled to connect to the energy storage device and disconnect from the DC input power supply, and the fourth preset power is greater than the second preset power.

5. The DC elevator system according to claim 4, characterized in that: The main control module is also used for: Obtaining historical regeneration data of the renewable energy device; generating a generation curve of renewable energy per unit time based on the historical regeneration data; Obtaining an energy consumption curve of total energy consumed within the unit time; determining the first preset power, the second preset power, the third preset power, and the fourth preset power based on the generation curve and the energy consumption curve; A first control strategy is generated based on the first preset power and the second preset power, and a second control strategy is generated based on the third preset power and the fourth preset power.

6. The DC elevator system according to claim 5, characterized in that: The determining the first preset power, the second preset power, the third preset power, and the fourth preset power based on the generation curve and the energy consumption curve includes: Obtaining a daytime charge and discharge number threshold and a nighttime charge and discharge number threshold, wherein the daytime charge and discharge number threshold is greater than the nighttime charge and discharge number threshold; When the current time period is within the preset daytime period, a first preset power quantity and a second preset power quantity are determined based on the daytime charge and discharge number threshold, the generation curve, and the energy consumption curve, and the renewable energy is completely consumed according to the first preset power quantity during the preset daytime period; When the current time period is within the preset nighttime period, a third preset power amount and a fourth preset power amount are determined based on the nighttime charge and discharge times threshold, the generation curve, and the energy consumption curve, and the renewable energy is completely consumed according to the third preset power amount during the preset nighttime period.

7. The DC elevator system according to claim 1, characterized in that: The main control module is also used for: Obtaining a first output current of the first semiconductor buck module and obtaining a second output current of the second semiconductor buck module; determining whether at least one of the first output current, the first DC voltage, the second output current, and the second DC voltage is abnormal; If so, the corresponding first semiconductor buck module and / or second semiconductor buck module is disconnected, and corresponding alarm information is output.

8. A DC elevator, characterized in that: The DC elevator comprises a DC elevator system according to any one of claims 1-7.

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