A common dc bus escalator control system and a control method thereof

Abstract

The application discloses a kind of common DC bus escalator control systems and control method thereof, system includes up escalator control subsystem, down escalator control subsystem and energy storage control subsystem, up escalator control subsystem and down escalator control subsystem share first DC bus, up escalator control subsystem is used to control the first escalator up and obtain the first operating current of first escalator, down escalator control subsystem is used to control the second escalator down and obtain the second operating current of second escalator, and energy storage control subsystem is used to control the power input of up escalator control subsystem and the power input / output of down escalator control subsystem according to the first operating current, second operating current and the bus voltage of first DC bus.The application reduces the energy consumption of escalator, improves the utilization rate of electric energy, and can be widely applied in escalator control technical field.

Description

Technical Field

[0001] This invention relates to the field of escalator control technology, and in particular to a common DC bus escalator control system and its control method. Background Technology

[0002] With the increasing demand for escalators in public places, new challenges have been posed to their energy consumption, leading to a gradual shift in the design of future escalator systems towards energy conservation and environmental protection. Typically, escalator systems are arranged in parallel, such as in shopping malls, airports, subways, and high-speed rail stations, where parallel escalators are used to transport passengers in both upward and downward directions. During the upward movement, the escalator motor operates in an electric state, while during the heavy-load downward movement, it generates electricity. Current technology typically uses braking resistors to dissipate the feedback energy generated during the heavy-load downward movement, resulting in significant energy waste and hindering the reduction of escalator system energy consumption. Therefore, there is an urgent need to design an escalator control system to recover and utilize the energy generated during the heavy-load downward movement, thereby reducing escalator energy consumption and improving energy efficiency. Summary of the Invention

[0003] To address the aforementioned technical problems, the present invention aims to provide a low-energy-consumption, high-energy-efficiency common DC bus escalator control system and its control method.

[0004] The first technical solution adopted in this invention is:

[0005] A common DC bus escalator control system includes an upward escalator control subsystem, a downward escalator control subsystem, and an energy storage control subsystem. The upward escalator control subsystem and the downward escalator control subsystem share a first DC bus. The upward escalator control subsystem controls the upward movement of a first escalator and acquires a first operating current of the first escalator. The downward escalator control subsystem controls the downward movement of a second escalator and acquires a second operating current of the second escalator. The energy storage control subsystem controls the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem based on the first operating current, the second operating current, and the bus voltage of the first DC bus.

[0006] Furthermore, the upward escalator control subsystem includes a first main control board, a first frequency converter, a first contactor, and a first motor. The first frequency converter is electrically connected to the first motor through the first contactor, and both the first frequency converter and the first contactor are signal connected to the first main control board.

[0007] The downward escalator control subsystem includes a second main control board, a second frequency converter, a second contactor, and a second motor. The second frequency converter is electrically connected to the second motor through the second contactor, and both the second frequency converter and the second contactor are signal connected to the second main control board.

[0008] Both the first frequency converter and the second frequency converter are connected to the first DC bus through the energy storage control subsystem, and both the first main control board and the second main control board are signal connected to the energy storage control subsystem.

[0009] Furthermore, the first frequency converter is used to control the operating state of the first motor according to the control signal of the first main control board, and to feed back the first operating current and the bus voltage to the first main control board. The first contactor is used to control the connection and disconnection between the first frequency converter and the first motor according to the control signal of the first main control board. The first motor is used to drive the first escalator to move upward.

[0010] The second frequency converter is used to control the operating state of the second motor according to the control signal of the second main control board, and to feed back the second operating current and the bus voltage to the second main control board. The second contactor is used to control the connection and disconnection between the second frequency converter and the second motor according to the control signal of the second main control board. The second motor is used to drive the second escalator downward and generate electrical energy to feed back to the first DC bus when the second escalator is heavily loaded downward.

[0011] Furthermore, the downward escalator control subsystem also includes a braking resistor, which is connected to the first DC bus via the second frequency converter and is signal-connected to the second main control board.

[0012] Furthermore, the energy storage control subsystem includes a third contactor, a voltage regulating module, an energy storage device, and an energy storage controller. The first frequency converter is electrically connected to the second frequency converter through the third contactor, and the energy storage device is electrically connected to the third contactor through the voltage regulating module. The third contactor is used to connect to the first DC bus. The first main control board, the second main control board, the third contactor, the voltage regulating module, and the energy storage device are all signal-connected to the energy storage controller. The energy storage controller is used to control the power input / output of the energy storage device according to the first operating current, the second operating current, and the bus voltage, and to control the power input of the first motor through the first main control board, and to control the power input / output of the second motor through the second main control board.

[0013] Furthermore, the upward escalator control subsystem also includes a fuse, through which the first frequency converter is electrically connected to the third contactor. The downward escalator control subsystem also includes a disconnect switch, through which the second frequency converter is electrically connected to the third contactor. The disconnect switch is signal-connected to the second main control board.

[0014] Furthermore, the energy storage control subsystem also includes a fourth contactor, through which the voltage regulation module is electrically connected to the third contactor, and the fourth contactor is signal-connected to the energy storage controller.

[0015] The second technical solution adopted in this invention is:

[0016] A control method for a common DC bus escalator control system, executed by the aforementioned common DC bus escalator control system, includes the following steps:

[0017] The first operating current of the first escalator going up is obtained through the upward escalator control subsystem, the second operating current of the second escalator going down is obtained through the downward escalator subsystem, and the bus voltage of the shared first DC bus is obtained through the energy storage control subsystem.

[0018] When the bus voltage is less than a preset first threshold, the energy storage control subsystem is controlled to output electrical energy to the up escalator control subsystem and the down escalator control subsystem through the first DC bus.

[0019] When the bus voltage is greater than or equal to the first threshold and the first operating current is greater than or equal to the second operating current, the down escalator subsystem is controlled to output electrical energy to the up escalator control subsystem.

[0020] When the bus voltage is greater than or equal to the first threshold and the first operating current is less than the second operating current, the down escalator subsystem is controlled to output electrical energy to the up escalator control subsystem and the energy storage control subsystem.

[0021] Furthermore, the downward escalator control subsystem is equipped with a braking resistor, and the control method further includes the following steps:

[0022] When the bus voltage is greater than a preset second threshold, the down escalator subsystem is controlled to output electrical energy to the up escalator control subsystem and the energy storage control subsystem, and the remaining electrical energy is consumed through the braking resistor.

[0023] Wherein, the second threshold is greater than the first threshold.

[0024] Furthermore, before the step of obtaining the first operating current of the first escalator going up through the upward escalator control subsystem, obtaining the second operating current of the second escalator going down through the downward escalator subsystem, and obtaining the bus voltage of the shared first DC bus through the energy storage control subsystem, the following steps are also included:

[0025] The upward escalator subsystem determines whether the first escalator is in normal condition, and the downward escalator subsystem determines whether the second escalator is in normal condition.

[0026] When both the first escalator and the second escalator are in normal condition, the DC bus circuit between the upward escalator subsystem and the downward escalator subsystem is connected through the energy storage control subsystem.

[0027] The beneficial effects of this invention are as follows: This invention provides a common DC bus escalator control system and its control method, including an upward escalator control subsystem, a downward escalator control subsystem, and an energy storage control subsystem. The upward escalator control subsystem and the downward escalator control subsystem share a first DC bus. The upward escalator control subsystem is used to control the upward movement of the first escalator and obtain the first operating current of the first escalator. The downward escalator control subsystem is used to control the downward movement of the second escalator and obtain the second operating current of the second escalator. The energy storage control subsystem is used to control the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem according to the first operating current, the second operating current, and the bus voltage of the first DC bus. In this embodiment of the invention, the upward escalator control subsystem and the downward escalator control subsystem are connected to a DC bus network, and energy storage and release are controlled through an energy storage control system. The energy consumption status of the upward and downward escalators is determined based on the first operating current, the second operating current, and the bus voltage, thereby dynamically adjusting the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem. This allows the downward escalator control subsystem to input the power generated during heavy-load downward movement into the upward escalator control subsystem for consumption and into the energy storage control subsystem for storage. The energy storage control subsystem can supply power when both the upward and downward escalator control subsystems are in a power-consuming state, thereby reducing the energy consumption of the escalator and improving the power utilization rate. Attached Figure Description

[0028] Figure 1 This is a schematic diagram of a common DC bus escalator control system provided in an embodiment of the present invention;

[0029] Figure 2 A flowchart illustrating the steps of a control method for a common DC bus escalator control system provided in an embodiment of the present invention. Detailed Implementation

[0030] The present invention will now be described in further detail with reference to the accompanying drawings and specific embodiments. The step numbers in the following embodiments are only for ease of explanation and do not limit the order of the steps. The execution order of each step in the embodiments can be adapted according to the understanding of those skilled in the art.

[0031] In the description of this invention, "multiple" means two or more. The use of "first" and "second" is for distinguishing technical features only and should not be construed as indicating or implying relative importance, or implicitly indicating the number of indicated technical features, or the order in which the indicated technical features are presented. Furthermore, unless otherwise defined, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art. The terminology used in this specification is for the purpose of describing particular embodiments only and not for limiting the invention.

[0032] Reference Figure 1 This invention provides a common DC bus escalator control system, including an upward escalator control subsystem, a downward escalator control subsystem, and an energy storage control subsystem. The upward escalator control subsystem and the downward escalator control subsystem share a first DC bus. The upward escalator control subsystem is used to control the upward movement of the first escalator and obtain the first operating current of the first escalator. The downward escalator control subsystem is used to control the downward movement of the second escalator and obtain the second operating current of the second escalator. The energy storage control subsystem is used to control the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem based on the first operating current, the second operating current, and the bus voltage of the first DC bus.

[0033] Specifically, in this embodiment of the invention, the upward escalator control subsystem and the downward escalator control subsystem are connected to a DC bus network, and energy storage and release are controlled through an energy storage control system. The energy consumption status of the upward and downward escalators is determined based on the first operating current, the second operating current, and the bus voltage, thereby dynamically adjusting the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem. This allows the downward escalator control subsystem to input the power generated during heavy-load downward movement into the upward escalator control subsystem for consumption and into the energy storage control subsystem for storage. The energy storage control subsystem can supply power when both the upward and downward escalator control subsystems are in a power-consuming state, thereby reducing the energy consumption of the escalator and improving the power utilization rate.

[0034] Reference Figure 1 As an optional implementation, the upward escalator control subsystem includes a first main control board, a first frequency converter, a first contactor, and a first motor. The first frequency converter is electrically connected to the first motor through the first contactor, and both the first frequency converter and the first contactor are signal connected to the first main control board.

[0035] The downward escalator control subsystem includes a second main control board, a second frequency converter, a second contactor, and a second motor. The second frequency converter is electrically connected to the second motor through the second contactor, and both the second frequency converter and the second contactor are signal connected to the second main control board.

[0036] Both the first and second frequency converters are connected to the first DC bus through the energy storage control subsystem, and both the first and second main control boards are connected to the energy storage control subsystem via signal connections.

[0037] Specifically, the first main control board / second main control board receives external control signals from the escalator for the corresponding escalator operation control, and outputs up / down signals to the first frequency converter / second frequency converter. It is also used to control the first contactor / second contactor to engage, and to communicate with the first frequency converter / second frequency converter to obtain signals such as the frequency converter output current and bus voltage. In addition, the first main control board and the second main control board establish a communication connection, and both establish a communication connection with the energy storage control subsystem for the transmission of current, voltage and other data, as well as control signals.

[0038] As a further optional implementation, the first frequency converter is used to control the operating state of the first motor according to the control signal of the first main control board, and to feed back the first operating current and bus voltage to the first main control board. The first contactor is used to control the connection and disconnection between the first frequency converter and the first motor according to the control signal of the first main control board. The first motor is used to drive the first escalator to move upward.

[0039] The second frequency converter is used to control the operating status of the second motor according to the control signal of the second main control board, and to feed back the second operating current and bus voltage to the second main control board. The second contactor is used to control the connection and disconnection between the second frequency converter and the second motor according to the control signal of the second main control board. The second motor is used to drive the second escalator downward and generate electrical energy to feed back to the first DC bus when the second escalator is heavily loaded and descending.

[0040] Specifically, the first frequency converter / second frequency converter receives control signals from the first main control board / second main control board and controls the first escalator to move upwards / the second escalator to move downwards. During operation, it transmits the output current signal and bus voltage signal to the first main control board / second main control board. The first contactor / second contactor is used for connection control between the first frequency converter / second frequency converter and the corresponding motor. When the first escalator / second escalator malfunctions, the first main control board / second main control board can disconnect the first contactor / second contactor, causing the first escalator / second escalator to stop running. The first motor / second motor is used to drive the first escalator to move upwards / the second escalator to move downwards. When the second escalator is heavily loaded and moving downwards, the second motor generates electrical energy, which is transmitted to the DC bus terminal of the second frequency converter through the motor line. The first motor / second motor can be an asynchronous motor or a synchronous motor.

[0041] Reference Figure 1 As an optional implementation, the down escalator control subsystem further includes a braking resistor, which is connected to the first DC bus via a second frequency converter and is signal-connected to the second main control board.

[0042] Specifically, the braking resistor is used to consume the extra energy generated by the DC bus circuit. When the electrical energy generated by the second motor is too much to be fully utilized by the energy storage control subsystem and the first motor, the braking resistor is connected through the second main control board to consume the extra electrical energy.

[0043] Reference Figure 1 As an optional implementation, the energy storage control subsystem includes a third contactor, a voltage regulating module, an energy storage device, and an energy storage controller. The first frequency converter is electrically connected to the second frequency converter through the third contactor, and the energy storage device is electrically connected to the third contactor through the voltage regulating module. The third contactor is used to connect to the first DC bus. The first main control board, the second main control board, the third contactor, the voltage regulating module, and the energy storage device are all signal-connected to the energy storage controller. The energy storage controller is used to control the energy input / output of the energy storage device according to the first operating current, the second operating current, and the bus voltage, and to control the energy input of the first motor through the first main control board, and to control the energy input / output of the second motor through the second main control board.

[0044] Specifically, the third contactor is used to connect the DC bus circuit between the first and second frequency converters. When the frequency converters are de-energized, if there is voltage in the DC bus circuit, it will generate an inrush current on the frequency converter's bus capacitor after power-on, causing damage to the frequency converter. Therefore, this embodiment of the invention uses a third contactor to control the on / off state of the DC bus circuit between the two frequency converters. The third contactor is simultaneously controlled by the first and second main control boards through an energy storage controller; the third contactor only engages to connect the DC bus circuit when the first and second escalators are in normal operating condition and the first and second frequency converters are already in operation.

[0045] The voltage regulating module is used to increase the voltage of the energy storage device, thereby forming a voltage difference with the DC bus voltage to control the current flow in the DC bus circuit; the energy storage device is used to store / release electrical energy; the energy storage controller is used to control the operation of the energy storage device and the voltage regulating module, and communicates with the first main control board and the second main control board to control the closing of the third contactor.

[0046] Reference Figure 1 As an optional implementation, the upward escalator control subsystem also includes a fuse, through which the first frequency converter is electrically connected to the third contactor. The downward escalator control subsystem also includes a disconnect switch, through which the second frequency converter is electrically connected to the third contactor. The disconnect switch is signal-connected to the second main control board.

[0047] Specifically, the fuse is used for the protection of the bus connection between the first frequency converter and the second frequency converter. It is connected in series between the DC bus terminal of the first frequency converter and the third contactor. When the bus circuit current is too high, the fuse blows and disconnects the DC bus circuit. The disconnecting switch is connected in series between the DC bus terminal of the second frequency converter and the third contactor. Under the control of the energy storage controller, it can actively disconnect the DC bus circuit.

[0048] Reference Figure 1 As an optional implementation, the energy storage control subsystem further includes a fourth contactor, through which the voltage regulation module is electrically connected to the third contactor, and the fourth contactor is signal-connected to the energy storage controller.

[0049] Specifically, the fourth contactor is controlled by the energy storage controller. When the fourth contactor is engaged, the energy storage device is connected to the DC bus circuit through the voltage regulation module, thereby enabling the energy storage device to charge and discharge.

[0050] The above describes the system structure of the embodiments of the present invention. The working principle and workflow of the embodiments of the present invention will be further explained below in conjunction with the control method.

[0051] Reference Figure 2 This invention provides a control method for a common DC bus escalator control system, which is executed by the aforementioned common DC bus escalator control system, and includes the following steps:

[0052] S101. Obtain the first operating current of the first escalator going up through the upward escalator control subsystem, obtain the second operating current of the second escalator going down through the downward escalator subsystem, and obtain the bus voltage of the shared first DC bus through the energy storage control subsystem.

[0053] S102. When the bus voltage is less than the preset first threshold, the energy storage control subsystem is controlled to output electrical energy to the upward escalator control subsystem and the downward escalator control subsystem through the first DC bus.

[0054] S103. When the bus voltage is greater than or equal to the first threshold and the first operating current is greater than or equal to the second operating current, control the down escalator subsystem to output electrical energy to the up escalator control subsystem.

[0055] S104. When the bus voltage is greater than or equal to the first threshold and the first operating current is less than the second operating current, control the down escalator subsystem to output electrical energy to the up escalator control subsystem and the energy storage control subsystem.

[0056] Specifically, during normal escalator operation, when the third contactor is engaged, the bus circuit between the first and second frequency converters is connected, and the bus voltages of the two frequency converters should be the same. The ascending escalator is in a power-consuming state, while the descending escalator is in a power-generating state when it reaches a certain load weight. When the descending escalator generates power, the generated electrical energy is transmitted to the second frequency converter through the second motor, thereby increasing the bus voltage of the second frequency converter. At this time, the corresponding second operating current of the descending escalator is the power-generating current. This embodiment of the invention obtains the first operating current of the ascending escalator, the second operating current of the descending escalator, and the bus voltage of the first DC bus, and performs the following control adjustments:

[0057] 1) When the bus voltage is less than the first threshold (e.g., 680V), it indicates that both escalators are in an energy-consuming state. At this time, the energy storage controller determines whether the energy storage device has stored electricity. If so, the fourth contactor is activated, and the voltage regulating device is controlled to increase the voltage of the DC bus terminal on the energy storage device side, so that a voltage difference is formed between the DC bus terminal of the energy storage device and the DC bus terminals of the first and second frequency converters, thereby releasing electrical energy for use by the upward and downward escalators.

[0058] 2) When the bus voltage is greater than or equal to the first threshold, it indicates that the down escalator is in the power generation state. The system determines whether the energy storage module is connected and charged by judging the power consumed by the up escalator and the power generated by the down escalator: (1) If the first operating current is greater than or equal to the second operating current, it means that the power generated by the down escalator can be completely consumed by the up escalator. At this time, the fourth contactor is controlled to be in the open state, and the down escalator directly generates power to supply the up escalator; (2) If the first operating current is less than the second operating current, it means that the power generated by the down escalator can not only meet the consumption of the up escalator, but also generate more extra power. At this time, the fourth contactor is controlled to be engaged and the energy storage device is charged.

[0059] As a further optional implementation, the downward escalator control subsystem is equipped with a braking resistor, and the control method further includes the following steps:

[0060] When the bus voltage is greater than the preset second threshold, the down escalator subsystem is controlled to output electrical energy to the up escalator control subsystem and the energy storage control subsystem, and the remaining electrical energy is consumed through the braking resistor.

[0061] The second threshold is greater than the first threshold.

[0062] Specifically, when the bus voltage is greater than the preset second threshold (e.g., 700V), it means that the electrical energy generated by the downward escalator not only meets the consumption of the upward escalator and the charging of the energy storage device, but also generates excess electrical energy. At this time, the braking resistor connected through the second frequency converter starts to work to consume the extra generated electrical energy.

[0063] As a further optional implementation, before obtaining the first operating current of the first escalator going up through the upward escalator control subsystem, obtaining the second operating current of the second escalator going down through the downward escalator subsystem, and obtaining the bus voltage of the shared first DC bus through the energy storage control subsystem, the following steps are also included:

[0064] The system determines whether the first escalator is in normal condition by using the upward escalator subsystem, and determines whether the second escalator is in normal condition by using the downward escalator subsystem.

[0065] When both the first and second escalators are in normal condition, the DC bus circuit between the upward escalator subsystem and the downward escalator subsystem is connected through the energy storage control subsystem.

[0066] Specifically, the system first determines whether the first and second escalators are in normal condition (not under maintenance or faulty). When the escalators are under maintenance or faulty, the third contactor used to connect the first and second frequency converters will not engage. When both the first and second escalators are in normal condition, the system determines whether the escalators are open. When the first escalator is open, the system waits for the second escalator to open. When both escalators are open, it means that the escalators of both frequency converters are energized. At this time, the system controls the third contactor to engage, thereby connecting the DC bus circuit between the upward escalator subsystem and the downward escalator subsystem, which facilitates the initiation of subsequent power input / output control processes.

[0067] In this embodiment of the invention, the upward escalator control subsystem and the downward escalator control subsystem are connected to a DC bus network, and energy storage and release are controlled through an energy storage control system. The energy consumption status of the upward and downward escalators is determined based on the first operating current, the second operating current, and the bus voltage, thereby dynamically adjusting the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem. This allows the downward escalator control subsystem to input the power generated during heavy-load downward movement into the upward escalator control subsystem for consumption and into the energy storage control subsystem for storage. The energy storage control subsystem can supply power when both the upward and downward escalator control subsystems are in a power-consuming state, thereby reducing the energy consumption of the escalator and improving the power utilization rate.

[0068] It is understood that the content of the above system embodiments is applicable to this method embodiment. The specific functions implemented in this method embodiment are the same as those in the above system embodiments, and the beneficial effects achieved are also the same as those achieved in the above system embodiments.

[0069] It should be recognized that embodiments of the present invention can be implemented or carried out by computer hardware, a combination of hardware and software, or by computer instructions stored in a non-transitory computer-readable storage medium. The methods described above can be implemented using standard programming techniques—including implementation in a computer program on a non-transitory computer-readable storage medium configured to allow the computer to operate in a specific and predefined manner—according to the methods and drawings described in the specific embodiments. Each program can be implemented in a high-level procedural or object-oriented programming language to communicate with the computer system. However, if desired, the program can be implemented in assembly or machine language. In any case, the language can be a compiled or interpreted language. Furthermore, for this purpose, the program can run on a programmed application-specific integrated circuit (ASIC).

[0070] Furthermore, the procedures described herein may be performed in any suitable order unless otherwise indicated herein or otherwise clearly contradicted by the context. The procedures described herein (or variations and / or combinations thereof) may be executed under the control of one or more computer systems configured with executable instructions, and may be implemented by hardware or a combination thereof as code (e.g., executable instructions, one or more computer programs, or one or more applications) that commonly executes on one or more processors. The aforementioned computer programs include a plurality of instructions executable by one or more processors.

[0071] Furthermore, the above methods can be implemented in any suitable type of computing platform, including but not limited to personal computers, minicomputers, mainframes, workstations, networked or distributed computing environments, standalone or integrated computer platforms, or in communication with charged particle tools or other imaging devices, etc. Aspects of the invention can be implemented as machine-readable code stored on a non-transitory storage medium or device, whether removable or integrated into a computing platform, such as a hard disk, optical read and / or write storage medium, RAM, ROM, etc., such that it is readable by a programmable computer, and when the storage medium or device is read by the computer, it can be used to configure and operate the computer to perform the processes described herein. Furthermore, the machine-readable code, or portions thereof, can be transmitted via wired or wireless networks. The invention described herein includes these and other different types of non-transitory computer-readable storage media when such media comprises instructions or programs that implement the steps described above in conjunction with a microprocessor or other data processor. When programmed according to the methods and techniques described in the invention, the invention also includes the computer itself.

[0072] A computer program can be applied to input data to perform the functions described herein, thereby transforming the input data to generate output data stored in non-volatile memory. The output information can also be applied to one or more output devices, such as a display. In a preferred embodiment of the invention, the transformed data represents physical and tangible objects, including a specific visual depiction of physical and tangible objects generated on the display.

[0073] The above description is merely a preferred embodiment of the present invention. The present invention is not limited to the above-described embodiments. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention, as long as they achieve the technical effects of the present invention by the same means, should be included within the scope of protection of the present invention. Within the scope of protection of the present invention, the technical solutions and / or implementation methods can have various modifications and variations.

Claims

1. A common DC bus escalator control system, characterized in that: The system includes an upward escalator control subsystem, a downward escalator control subsystem, and an energy storage control subsystem. The upward escalator control subsystem and the downward escalator control subsystem share a first DC bus. The upward escalator control subsystem is used to control the upward movement of the first escalator and obtain the first operating current of the first escalator. The downward escalator control subsystem is used to control the downward movement of the second escalator and obtain the second operating current of the second escalator. The energy storage control subsystem is used to control the power input of the upward escalator control subsystem and the power input / output of the downward escalator control subsystem based on the first operating current, the second operating current, and the bus voltage of the first DC bus. The upward escalator control subsystem includes a first main control board, a first frequency converter, a first contactor, and a first motor. The first frequency converter is electrically connected to the first motor through the first contactor, and both the first frequency converter and the first contactor are signal connected to the first main control board. The downward escalator control subsystem includes a second main control board, a second frequency converter, a second contactor, and a second motor. The second frequency converter is electrically connected to the second motor through the second contactor, and both the second frequency converter and the second contactor are signal connected to the second main control board. Both the first frequency converter and the second frequency converter are connected to the first DC bus through the energy storage control subsystem, and both the first main control board and the second main control board are signal connected to the energy storage control subsystem. The first frequency converter is used to control the operating state of the first motor according to the control signal of the first main control board, and to feed back the first operating current and the bus voltage to the first main control board. The first contactor is used to control the connection and disconnection between the first frequency converter and the first motor according to the control signal of the first main control board. The first motor is used to drive the first escalator to move upward. The second frequency converter is used to control the operating state of the second motor according to the control signal of the second main control board, and to feed back the second operating current and the bus voltage to the second main control board. The second contactor is used to control the connection and disconnection between the second frequency converter and the second motor according to the control signal of the second main control board. The second motor is used to drive the second escalator downward and generate electrical energy to feed back to the first DC bus when the second escalator is heavily loaded downward. The energy storage control subsystem includes a third contactor, a voltage regulating module, an energy storage device, and an energy storage controller. The first frequency converter is electrically connected to the second frequency converter through the third contactor. The energy storage device is electrically connected to the third contactor through the voltage regulating module. The third contactor is used to connect to the first DC bus. The first main control board, the second main control board, the third contactor, the voltage regulating module, and the energy storage device are all signal-connected to the energy storage controller. The energy storage controller is used to control the power input / output of the energy storage device according to the first operating current, the second operating current, and the bus voltage, and controls the power input of the first motor through the first main control board, and controls the power input / output of the second motor through the second main control board.

2. The common DC bus escalator control system according to claim 1, characterized in that: The downward escalator control subsystem also includes a braking resistor, which is connected to the first DC bus via the second frequency converter and is signal-connected to the second main control board.

3. The common DC bus escalator control system according to claim 1, characterized in that: The upward escalator control subsystem also includes a fuse, through which the first frequency converter is electrically connected to the third contactor. The downward escalator control subsystem also includes a disconnect switch, through which the second frequency converter is electrically connected to the third contactor. The disconnect switch is signal-connected to the second main control board.

4. The common DC bus escalator control system according to claim 1, characterized in that: The energy storage control subsystem also includes a fourth contactor, through which the voltage regulation module is electrically connected to the third contactor, and the fourth contactor is signal-connected to the energy storage controller.

5. A control method for a common DC bus escalator control system, used to be executed by the common DC bus escalator control system as described in any one of claims 1 to 4, characterized in that, Includes the following steps: The first operating current of the first escalator going up is obtained through the upward escalator control subsystem, the second operating current of the second escalator going down is obtained through the downward escalator control subsystem, and the bus voltage of the shared first DC bus is obtained through the energy storage control subsystem. When the bus voltage is less than a preset first threshold, the energy storage control subsystem is controlled to output electrical energy to the up escalator control subsystem and the down escalator control subsystem through the first DC bus. When the bus voltage is greater than or equal to the first threshold and the first operating current is greater than or equal to the second operating current, the down escalator control subsystem is controlled to output electrical energy to the up escalator control subsystem. When the bus voltage is greater than or equal to the first threshold and the first operating current is less than the second operating current, the down escalator control subsystem is controlled to output electrical energy to the up escalator control subsystem and the energy storage control subsystem.

6. The control method according to claim 5, characterized in that, The downward escalator control subsystem is equipped with a braking resistor, and the control method further includes the following steps: When the bus voltage is greater than a preset second threshold, the downward escalator control subsystem is controlled to output electrical energy to the upward escalator control subsystem and the energy storage control subsystem, and the remaining electrical energy is consumed through the braking resistor. Wherein, the second threshold is greater than the first threshold.

7. The control method according to claim 5, characterized in that, Before the step of obtaining the first operating current of the first escalator going up through the upward escalator control subsystem, obtaining the second operating current of the second escalator going down through the downward escalator control subsystem, and obtaining the bus voltage of the shared first DC bus through the energy storage control subsystem, the following steps are also included: The upward escalator control subsystem determines whether the first escalator is in normal condition, and the downward escalator control subsystem determines whether the second escalator is in normal condition. When both the first escalator and the second escalator are in normal condition, the DC bus circuit between the upward escalator control subsystem and the downward escalator control subsystem is connected through the energy storage control subsystem.

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