Energy-saving elevator system and control method thereof

Abstract

The present application provides an energy-saving elevator system and a control method thereof. The elevator system includes: an elevator motor, an AC power supply, an inverter, an energy conversion module, a supercapacitor module for storing electrical energy, a high-voltage box module connected between the energy conversion module and the supercapacitor module, and an energy management module. The module is used to store the electrical energy of the DC bus in the supercapacitor module through the energy conversion module and the high-voltage box module when the elevator motor is in a first state, and to output the electrical energy stored in the supercapacitor module to the DC bus of the inverter through the high-voltage box module and the energy conversion module when the elevator motor is in a second state. The present application solves the problem that traditional energy-saving cabinets affect the normal operation and service life of the original elevator system, and the overall efficiency and operational reliability are low due to the feedback of electrical energy to the power grid.

Description

Technical Field

[0001] The present application relates to the field of elevator technology, and in particular to an energy-saving elevator system and a control method thereof. Background Art

[0002] With the acceleration of urbanization, the number of high-rise buildings is increasing. As an indispensable means of transporting and moving people in high-rise buildings, the use of elevators has also increased dramatically.

[0003] As a means of transportation that moves vertically, traditional elevator systems generate a large amount of regenerative energy during operation, especially during braking and deceleration. Effectively utilizing this regenerative energy to reduce elevator energy consumption has attracted considerable attention.

[0004] Some existing elevator systems utilize this regenerative energy by installing additional energy-saving cabinets that convert it into AC power and feed it back into the power grid. However, these elevator energy-saving cabinets are designed and implemented using a non-parallel connection to the existing elevator system. This connection method can negatively impact the safe operation of the existing elevator system, potentially causing system instability and frequent failures, which in turn impacts the normal operation and service life of the elevator.

[0005] Moreover, the way the energy-saving cabinet converts renewable electricity into alternating current and feeds it back to the power grid increases the complexity of the overall elevator system and is prone to causing impact and interference to the power grid, affecting the overall efficiency and reliability of the system operation. Summary of the Invention

[0006] The embodiments of the present application provide an energy-saving elevator system and a control method thereof, aiming to solve the problems in the prior art in which energy-saving cabinets affect the normal operation and service life of the original elevator system, and the increased complexity of the elevator system leads to reduced overall efficiency and operational reliability.

[0007] In a first aspect, an embodiment of the present application provides an energy-saving elevator system, comprising: an elevator motor, an AC power supply, and an inverter that drives the elevator motor to operate through the AC power supply. The energy-saving elevator system further comprises: an electric energy conversion module, wherein the first connection end of the electric energy conversion module is connected to the DC bus of the inverter, for drawing electric energy from the DC bus, converting it into a first target voltage and outputting it from the second connection end, or receiving electric energy from the second connection end, converting it into a second target voltage and providing it to the DC bus; a supercapacitor module, wherein the supercapacitor module has a capacitor connection end, for storing electric energy received through the capacitor connection end, or outputting stored electric energy through the capacitor connection end; a high-voltage box module, wherein one end of the high-voltage box module is connected to the second connection end of the electric energy conversion module. , the other end of the high-voltage box module is connected to the capacitor connection end of the supercapacitor module; an energy management module, the energy management module is respectively communicated with the power conversion module, the high-voltage box module and the supercapacitor module; wherein the energy management module is used to: when the elevator motor is in a first state, store the electric energy of the DC bus in the supercapacitor module through the power conversion module and the high-voltage box module, and when the elevator motor is in a second state, output the electric energy stored in the supercapacitor module to the DC bus of the inverter through the high-voltage box module and the power conversion module.

[0008] In a second aspect, an embodiment of the present application provides a control method for an energy-saving elevator system, which is applied to the energy-saving elevator system described above. The control method includes: obtaining a voltage value of a DC bus of an inverter; determining that the elevator motor is in a first state when the voltage value is greater than or equal to a preset threshold; starting an electric energy conversion module and a high-voltage box module, and converting the electric energy of the DC bus into a first target voltage to charge a supercapacitor module through the electric energy conversion module and the high-voltage box module; obtaining the charge of the supercapacitor module during the charging process; stopping charging the supercapacitor module when the charge of the supercapacitor module has reached a maximum capacity; determining that the elevator motor is in a second state when the voltage value is less than the preset threshold; starting the electric energy conversion module and the high-voltage box module, and discharging the supercapacitor module and converting the voltage into a second target voltage through the electric energy conversion module and the high-voltage box module, and providing the voltage to the DC bus; obtaining the charge of the supercapacitor module during the discharge process; and stopping discharging the supercapacitor module when the charge of the supercapacitor module has dropped to a minimum capacity.

[0009] The present application provides an energy-saving elevator system and its control method. By connecting an electric energy conversion module, a high-voltage box module, a supercapacitor module, and an energy management module in parallel on the DC bus side of the inverter, the energy-saving elevator system can store regenerative energy generated during elevator operation in the supercapacitor module and release it back to the DC bus to power the elevator motor when needed. This system configuration has good system independence and does not interfere with the operation of the original elevator system, ensuring the normal operation and service life of the elevator. Furthermore, the entire electric energy recycling process does not require energy to be fed back to the AC power grid, effectively improving the utilization efficiency of regenerative energy and avoiding the complexity and safety hazards caused by interaction with the AC power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0010] In order to more clearly illustrate the technical solutions of the embodiments of the present application, the following is a brief introduction to the drawings required for use in the description of the embodiments. Obviously, the drawings described below are some embodiments of the present application. For ordinary technicians in this field, other drawings can be obtained based on these drawings without any creative work.

[0011] Figure 1 A schematic diagram of an application scenario of the energy-saving elevator system provided in an embodiment of the present application;

[0012] Figure 2 A schematic diagram of an electric energy conversion module provided in an embodiment of the present application;

[0013] Figure 3 A schematic diagram of the principle of a voltage conversion unit provided in an embodiment of the present application;

[0014] Figure 4 A schematic diagram of a high-voltage box module provided in an embodiment of the present application;

[0015] Figure 5 A schematic diagram of a supercapacitor module provided in an embodiment of the present application;

[0016] Figure 6 A flow chart of a control method provided in an embodiment of the present application;

[0017] Figure 7 A flow chart of a control method provided in another embodiment of the present application;

[0018] Figure 8 This is a functional block diagram of the control device provided in an embodiment of the present application. DETAILED DESCRIPTION

[0019] The following will be combined with the drawings in the embodiments of this application to clearly and completely describe the technical solutions in the embodiments of this application. Obviously, the embodiments described are part of the embodiments of this application, not all of the embodiments. Based on the embodiments in this application, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of this application.

[0020] It will be understood that when used in this specification and the appended claims, the terms “comprises” and “comprising” indicate the presence of described features, integers, steps, operations, elements and / or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components and / or groups thereof.

[0021] It should also be understood that the terms used in this specification are for the purpose of describing specific embodiments only and are not intended to limit the present application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms unless the context clearly indicates otherwise.

[0022] It should be further understood that the term "and / or" used in this specification and the appended claims refers to and includes any and all possible combinations of one or more of the associated listed items.

[0023] Figure 1 This is a schematic diagram of an application scenario of the energy-saving elevator system provided in an embodiment of the present application. For example, Figure 1 It includes a conventional motor system 10 and an energy-saving subsystem 20 for realizing the utilization of regenerative energy.

[0024] like Figure 1 As shown, the conventional motor system 10 includes an elevator motor 11 , an AC power supply 12 and a frequency converter 13 .

[0025] The elevator motor 11 is the power source for driving the elevator car to ascend or descend. The AC power supply 12 is the power source for providing AC power, for example, an AC power supply from the mains grid.

[0026] The inverter 13 is a functional unit capable of converting electrical energy. It includes an AC / DC conversion module 131 that converts AC power to DC power and vice versa, generating the voltage / current required by the elevator motor 11 and driving the elevator motor 11 to operate at the desired state.

[0027] In actual use, when the elevator motor 11 is in a deceleration or braking state, it will regenerate electrical energy. In the absence of an additional energy utilization system or device, this regenerated electrical energy can be consumed by the resistor 15 on the DC bus 14 and converted into heat energy or the like.

[0028] In order to fully utilize the regenerative power generated by the elevator motor 11, please continue to refer to Figure 1 The energy-saving subsystem 20 includes: an electric energy conversion module 21, a high-voltage box module 22, a supercapacitor module 23 and an energy management module 24.

[0029] The power conversion module 21 is a functional module that provides voltage conversion and supports bidirectional power transfer. It has a first connection terminal 21a connected in parallel to the DC bus 14 and a second connection terminal 21b connected to the high-voltage box module 22. It can draw power from the DC bus 14, convert it to a first target voltage, and output it from the second connection terminal 21b. It can also receive power from the second connection terminal 21b, convert it to a second target voltage, and then provide it to the DC bus 14.

[0030] The high-voltage box module 22 is a functional module for establishing a high-voltage power path. It is arranged between the power conversion module 21 and the supercapacitor module 23 to enable high-voltage direct current to be controlled and reliably transmitted between the two.

[0031] The supercapacitor module 23 is an energy storage device for temporarily storing regenerative electrical energy and has a capacitor connection terminal for receiving electrical energy or outputting stored electrical energy.

[0032] The energy management module 24 communicates with the power conversion module 21, the high-voltage box module 22, and the supercapacitor module 23, respectively, and serves as the primary control core of the entire energy-saving subsystem 20. Using pre-defined control strategies, it controls the operation of the power conversion module 21, the high-voltage box module 22, and the supercapacitor module 23 based on the current operating conditions of the elevator motor, thereby fully utilizing the regenerative power generated by the elevator motor and improving overall energy efficiency.

[0033] Specifically, when the elevator motor 11 is detected to be in the first state, electric energy is drawn from the DC bus 14 and stored in the supercapacitor module 23 through the electric energy conversion module 21 and the high-voltage box module 22. When the elevator motor 11 is detected to be in the second state, the electric energy stored in the supercapacitor module 23 is output to the DC bus of the inverter through the high-voltage box module 22 and the electric energy conversion module 21 for consumption and use by the elevator motor 11.

[0034] In this application, the "first state" refers to the elevator motor 11 being in a working state of generating electrical energy (for example, deceleration or braking), and the "second state" refers to the elevator motor 11 being in a working state of higher power consumption demand (for example, starting or accelerating).

[0035] In this way, the energy-saving subsystem 20 can use the supercapacitor module 23 to temporarily store regenerative electric energy, and according to the load and operation requirements of the elevator, control the voltage conversion module when necessary to convert the electric energy stored in the supercapacitor module into a suitable voltage and current for supplying to the elevator motor, thereby reducing the electric energy drawn from the power grid and achieving the purpose of energy saving.

[0036] It is understood that although the specific operation process of the energy-saving subsystem is described in the embodiments of the present application using a typical elevator system as an example, based on the same inventive concept, those skilled in the art may also apply the energy-saving subsystem provided in the embodiments of the present application to other different elevator systems, and this is not specifically limited here.

[0037] In order to fully describe the inventive concept of the present application, the specific composition and operating principle of the energy-saving subsystem are described in detail below in combination with one or more specific examples.

[0038] Figure 2 Schematic diagram of the power conversion module of the embodiment of the present application. Figure 2 As shown, the power conversion module 21 includes: a voltage conversion unit 211, a first switch 212, a first fuse 213, a second switch 214 and a second fuse 215;

[0039] Among them, the high voltage connection end of the voltage conversion unit 211 is the first connection end 21a, which forms a first electrical connection loop with the DC bus, and the low voltage connection end of the voltage conversion unit 211 is the second connection end 21b, which forms a second electrical connection loop with the high voltage box module.

[0040] The voltage conversion unit 211 is a functional component with bidirectional voltage conversion capabilities and can operate in either boost mode or buck mode. When operating in boost mode, it can increase the input voltage level of the low-voltage connection terminal to a higher voltage level and output it from the high-voltage connection terminal. When operating in buck mode, it can reduce the input voltage of the high-voltage connection terminal to a lower voltage level and output it from the low-voltage connection terminal.

[0041] Specifically, the voltage conversion unit 211 can select a buck-boost converter of any suitable topology according to actual needs. Figure 3 A buck-boost converter that can be used by the voltage conversion unit 211 is shown. Figure 3 As shown, the buck-boost converter includes a controllable switch S, a freewheeling diode D, an inductor L, and a capacitor C.

[0042] One end of the controllable switch S is connected to the positive electrode of the high voltage connection end, the other end of the controllable switch S is connected to one end of the inductor L, and the other end of the inductor L is connected to the positive electrode of the low voltage connection end.

[0043] The cathode of the freewheeling diode D is connected to the cathode of the high voltage connection terminal, and the anode of the freewheeling diode D is connected to the common connection node between the controllable switch S and the inductor L. One end of the capacitor C is connected to the anode of the low voltage connection terminal, and the other end of the capacitor C is connected to the cathode of the low voltage connection terminal.

[0044] During actual operation, when controllable switch S is turned on, the input voltage at the high-voltage terminal is directly applied to inductor L, causing the inductor current to rise and storing energy. Simultaneously, inductor L and capacitor C jointly supply power to the low-voltage terminal. At this point, diode D is reverse biased and non-conducting.

[0045] When the controllable switch S is turned off, the inductor current cannot be interrupted instantly. The energy stored in the inductor L is released through the diode D, continuously supplying the capacitor C and the low-voltage connection terminal. At this time, the diode D is turned on, and the output current of the low-voltage connection terminal is maintained by the inductor L and capacitor C, achieving current continuity.

[0046] Thus, by controlling the on-time ratio (PWM duty cycle) of the controllable switch S, the high voltage inputted from the high voltage connection terminal is converted into a lower first target voltage and outputted from the low voltage connection terminal.

[0047] The first switch 212 is a circuit switch provided on the first electrical connection loop, and is used to control the on / off state of the first electrical connection loop, thereby correspondingly connecting or disconnecting the electrical connection path between the power conversion module 21 and the DC bus 14 .

[0048] The first fuse 213 is provided in the first electrical connection loop and is a protection device for protecting the voltage conversion unit 211. When the current value flowing from the DC bus into the voltage conversion unit 211 is too large, the first fuse 213 can melt and play a protective role.

[0049] The second switch 214 is provided on the second electrical connection loop, and is used to control the conduction or disconnection of the second electrical connection loop, and accordingly connect or disconnect the electrical connection path between the power conversion module 21 and the high-voltage box module 22 .

[0050] The second fuse 215 is provided in the second electrical connection loop and is a protective device for protecting the high-voltage box module 22. When the current output from the voltage conversion unit 211 to the high-voltage box module 22 is too large, the second fuse 215 can be blown in time to protect the high-voltage box module 22.

[0051] For details, please refer to Figure 2 The voltage conversion unit 211 further includes an AC power supply terminal 21c. The AC power supply terminal 21c is a port for connecting to an AC power source. Through the AC power supply terminal 21c, the power conversion module 21 can draw power from the AC power source to support the normal operation of the voltage conversion unit 211 when the DC bus is not providing stable power.

[0052] In the preferred embodiment, in order to improve the level of intelligence and provide convenience for maintenance and control by technicians, please continue to refer to Figure 2 The power conversion module also includes: an interactive control device 216 and a wireless communication unit 217.

[0053] The interactive control device 216 is connected to the voltage conversion unit 211 and is used to receive user instructions, control the voltage conversion unit and / or display the operating status of the voltage conversion unit.

[0054] Specifically, the interactive control device 216 can choose to use any suitable type of device according to actual needs, such as a touch screen, as long as it can provide the required human-computer interaction interface to display the system operation status for users to manually view, set or control related device parameters.

[0055] The wireless communication unit 217 is connected to the voltage conversion unit 211 and is used to establish a wireless communication connection between the external device and the voltage conversion unit. Specifically, the wireless communication unit 217 can also select any appropriate type of wireless communication method according to actual needs, such as a 4G cellular network.

[0056] The additional interactive control device 216 and wireless communication unit 217 enable real-time display of parameters such as voltage, current, power, temperature, and fault status of the energy-saving subsystem, making it easier for on-site commissioning personnel to view the system's operating status. Furthermore, the wireless communication unit can upload operating data in real time to a remote server or cloud platform, allowing maintenance personnel to remotely view the equipment's operating status and further implement functions such as fault alarms, energy consumption analysis, and remote diagnosis.

[0057] Figure 4 Schematic diagram of the high voltage box module of the embodiment of the present application. Figure 1 and Figure 4 As shown, the high-voltage box module 22 includes: a third connection terminal 221 , a fourth connection terminal 222 , a positive contactor 223 , a pre-charge resistor 224 , a pre-charge contactor 225 , a shunt 226 and a high-voltage box control unit 227 .

[0058] The third connection terminal 221 is electrically connected to the power conversion module 21 and consists of a third high-potential connection terminal 221a and a third low-potential connection terminal 221b. The fourth connection terminal 222 is electrically connected to the supercapacitor module 23 and consists of a fourth high-potential connection terminal 222a and a fourth low-potential connection terminal 222b.

[0059] A main circuit allowing direct current to pass through is formed between the third connection terminal 221 and the fourth connection terminal 222 , which are composed of a pair of high-potential connection terminals and a low-potential connection terminal.

[0060] One end of the positive contactor 223 is connected to the third high potential connection terminal 221a, and the other end of the positive contactor 223 is connected to the fourth high potential connection terminal 222a. Thus, by engaging and disengaging the positive contactor 223, the main circuit can be controlled to be turned on or off.

[0061] One end of the pre-charge resistor 224 is connected to the third high-potential connection terminal 221a, and the other end of the pre-charge resistor 224 is connected to the fourth high-potential connection terminal 222a via a pre-charge contactor 225. The pre-charge resistor 224 and the pre-charge contactor 225 form another pre-charge circuit parallel to the main circuit. Accordingly, the pre-charge circuit can be turned on or off by engaging and disengaging the pre-charge contactor 225.

[0062] The current divider 226 is connected to the third low potential connection terminal 221b and the fourth low potential connection terminal 222b respectively, and is a sampling circuit for collecting the current value of the main circuit or the pre-charge circuit.

[0063] The high-voltage box control unit 227 is the main control circuit of the high-voltage box module. It is connected to the shunt 226 and is used to control the positive contactor 223 and the pre-charge contactor 225 according to the collected current value, selectively connecting the pre-charge circuit or the main circuit.

[0064] During actual use, when the high-voltage box module is started and a DC connection path is prepared to be established between the supercapacitor module and the power conversion module, the pre-charging stage is first entered. At this time, the high-voltage box control unit 227 controls the positive contactor 223 in the main circuit to remain open while controlling the pre-charging contactor 225 to close, so that the current flows from the third high-potential connection terminal 221a through the pre-charging resistor 224 to the fourth high-potential connection terminal 222a, and then enters the supercapacitor module 23.

[0065] As charging continues, the high-voltage box control unit 227 continuously collects the current value in the loop through the shunt 226, and makes a real-time judgment on the pre-charging status in combination with the voltage difference threshold and / or pre-charging time set by the system.

[0066] When it is determined that the pre-charging stage has ended, the high-voltage box control unit 227 disconnects the pre-charging contactor 225 to disconnect the pre-charging circuit, and then closes the positive contactor 223 to connect the main circuit, so that the current flows directly into the supercapacitor module 23 through the main circuit, realizing efficient high-current energy transmission.

[0067] Through the above-mentioned switching mechanism between pre-charging and main circuit, slow charging of the supercapacitor is achieved, effectively avoiding the current shock problem caused by direct connection of the main circuit.

[0068] In some embodiments, please refer to Figure 4 The high-voltage box module also includes: a circuit breaker 228 and a fuse 229.

[0069] The circuit breaker 228 is respectively connected to the third connection terminal 221 and the fourth connection terminal 222. It is set on the main circuit and can protect and timely shut down the main circuit and the pre-charging circuit.

[0070] One end of the fuse 229 is connected to the common connection node of the pre-charge contactor 225 and the positive contactor 223, and the other end of the fuse is connected to the fourth high-potential connection terminal 222a. As a result, when the current of the pre-charge circuit or the main circuit exceeds the set threshold, the fuse can be promptly blown to protect the supercapacitor module 23.

[0071] For details, please refer to Figure 4 The high-voltage box module also includes: a switching power supply 2210, a status indicator light 2211 and a communication interface 2212.

[0072] The switching power supply 2210 is a power supply module for the high-voltage box module. It is connected to the third connection terminal 221 and the fourth connection terminal 222, respectively, and is used to draw power from the main circuit or the pre-charge circuit when it is turned on to power the high-voltage box control unit 227 and support its operation.

[0073] The status indicator light 2211 is connected to the high-voltage box control unit 227 and is a functional unit used to indicate the current operating status of the high-voltage box module. The status indicator light 2211 can be displayed using a suitable visual representation based on actual needs, such as by indicating whether it is lit or illuminated at different brightness levels.

[0074] The communication interface 2212 is connected to the high-voltage box control unit 227 and is used to establish a communication connection with the supercapacitor module and / or the energy management module. It can establish a communication connection with external functional modules via corresponding cables, enabling data transfer between these functional modules. For example, it can receive external control commands or provide data information to the power conversion module.

[0075] Figure 5 Schematic diagram of the supercapacitor module of the embodiment of the present application. Figure 5 As shown, the supercapacitor module 23 includes a capacitor array 231 and a capacitor control board 232 .

[0076] The capacitor array 231 is formed by a plurality of capacitors electrically connected in sequence, and may include a specific number of capacitors according to actual needs, and may be electrically connected in series, parallel, or a combination of the two to form an overall capacitor array.

[0077] The capacitor control board 232 integrates multiple functional circuits, such as a voltage sampling circuit 234 and a temperature sampling circuit 235. These voltage sampling circuits 234 and temperature sampling circuits 235 are electrically connected to the capacitor array 231 and are used to collect parameters such as the temperature, voltage, and current of each capacitor in the capacitor array.

[0078] Specifically, the capacitor control board 232 includes: a positive connection terminal 232a, a negative connection terminal 232b, a capacitor module positive electrode 232c, a capacitor module negative electrode 232d, and one or more interfaces such as a data transmission interface 232e.

[0079] The positive connection terminal 232a is connected to the fourth high-potential connection terminal 222a, and the negative connection terminal 232b is connected to the fourth low-potential connection terminal 222b. The capacitor module positive electrode 232c and the capacitor module negative electrode 232d are connected to the positive and negative electrodes of the capacitor array 231, respectively. The data transmission interface 232e is connected to the communication interface 2212 of the high-voltage box module to transmit collected data information.

[0080] Preferably, the supercapacitor module 23 further includes a signal light 233. The signal light 233 is electrically connected to the capacitor control board 232 and is used to intuitively indicate the current working status of the supercapacitor module 23 in the form of visual information.

[0081] Based on the energy-saving elevator system provided in the embodiments of the present application, the embodiments of the present application further provide a control method. This control method is executed by any suitable type of controller with logical computing capabilities (e.g., the aforementioned energy management module) to control the energy-saving elevator system to perform corresponding actions in response to different operating states of the elevator motor.

[0082] Figure 6 This is a flow chart of the control method of the embodiment of the present application. Figure 6 As shown, the control method includes the following steps:

[0083] S101, obtaining the voltage value of the DC bus of the inverter;

[0084] Among them, the voltage value of the DC bus can objectively reflect the current working state of the elevator motor, whether it is in a state of regenerating electric energy or whether it is providing higher output power.

[0085] S102: Determine whether the voltage value of the DC bus is greater than a preset threshold. If so, execute step S103; if not, execute step S203;

[0086] The preset threshold is a value pre-set according to actual needs. It can be set by a technician. Specifically, the preset threshold is set to 500V.

[0087] S103: Determine that the elevator motor is in the first state and the supercapacitor module needs to be charged;

[0088] Among them, when the voltage of the DC bus is significantly higher, it indicates that the elevator motor is generating electrical energy, prompting the need to temporarily store this electrical energy through the supercapacitor module.

[0089] S104, starting the power conversion module and the high-voltage box module, and converting the power of the DC bus into a first target voltage through the power conversion module and the high-voltage box module to charge the supercapacitor module;

[0090] The first target voltage refers to the input voltage required by the supercapacitor module, which is set according to actual needs and is not specifically limited here.

[0091] Specifically, such as Figure 7 As shown, step S104 includes:

[0092] S1041: Determine whether the power conversion module and the high-voltage box module are normal. If so, proceed to step S1042; if not, proceed to step S107.

[0093] S1042. Draw power from the DC bus to charge the supercapacitor module.

[0094] S105. Acquire the power of the supercapacitor module during the charging process of the supercapacitor module;

[0095] The capacity of the supercapacitor module refers to the electrical energy currently stored in the capacitor array. The amount of stored energy can be represented or measured in any suitable manner, for example, using the state of charge (SOC).

[0096] S106: Determine whether the power of the supercapacitor module has reached the maximum capacity. If so, execute step S107; if not, continue to execute step S104.

[0097] S107, stop charging the supercapacitor module and enter the standby state;

[0098] When the maximum capacity is reached (for example, SOC reaches 100%), the supercapacitor module has been fully charged and no further charging is required. At this point, the energy-saving subsystem enters standby mode and no longer stores energy.

[0099] S203: Determine that the elevator motor is in the second state and the supercapacitor module needs to be discharged;

[0100] Among them, when the voltage of the DC bus begins to decrease, it indicates that the elevator motor has a higher output power demand at this time. At this time, the supercapacitor module is discharged to help maintain the voltage of the DC bus and provide it to the elevator motor for consumption.

[0101] S204, starting the power conversion module and the high-voltage box module, so that the supercapacitor module is discharged and converted into a second target voltage through the power conversion module and the high-voltage box module, and provided to the DC bus;

[0102] The second target voltage is different from the first target voltage and is a higher DC voltage required by the inverter. It can be set according to actual needs and is not specifically limited here.

[0103] For details, please refer to Figure 7 , the step S204 specifically includes:

[0104] S2041: Determine whether the power conversion module and the high-voltage box module are normal. If so, proceed to step S2042; if not, proceed to step S207.

[0105] S2042. Discharge the supercapacitor module to provide electrical energy to the DC bus.

[0106] S205 . Acquire the amount of electricity in the supercapacitor module during the discharge process of the supercapacitor module.

[0107] S206: Determine whether the power of the supercapacitor module has dropped to the minimum capacity. If so, execute step S207; if not, continue to execute step S204.

[0108] S207, stopping the supercapacitor module from discharging and entering a standby state;

[0109] When the supercapacitor module's charge level drops to its minimum (for example, SOC is 0%), indicating it can no longer discharge, the energy-saving subsystem enters standby mode and no longer supplies power to the DC bus.

[0110] In some embodiments, in order to further ensure the completeness and reliability of the control strategy, more judgment steps may be included. Figure 7 As shown, before executing step S104, the control method further includes:

[0111] S301, obtaining the power of the supercapacitor module;

[0112] S302: Determine whether the power of the supercapacitor module has reached the maximum capacity. If so, execute step S107; if not, execute step S104.

[0113] In other embodiments, please refer to Figure 7 Before executing step S204, the control method further includes:

[0114] S401, obtaining the power of the supercapacitor module;

[0115] S402: Determine whether the power of the supercapacitor module has dropped to the minimum capacity. If so, execute step S207; if not, execute step S204.

[0116] The present application also provides a control device. The control device is used to execute any embodiment of the above control method. Specifically, Figure 8 As shown, the control device includes: a detection module 501 , a charging module 502 and a discharging module 503 .

[0117] Among them, the detection module 501 is used to obtain the voltage value of the DC bus of the inverter; when the voltage value is greater than or equal to the preset threshold, it is determined that the elevator motor is in the first state, and when the voltage value is less than the preset threshold, it is determined that the elevator motor is in the second state.

[0118] The charging module 502 is used to start the power conversion module and the high-voltage box module when it is determined that the elevator motor is in the first state, and convert the power of the DC bus into a first target voltage to charge the supercapacitor module through the power conversion module and the high-voltage box module, and obtain the power of the supercapacitor module during the charging process; when the power of the supercapacitor module has reached the maximum capacity, stop charging the supercapacitor module.

[0119] The discharge module 503 is used to start the power conversion module and the high-voltage box module when it is determined that the elevator motor is in the second state, and discharge the supercapacitor module and convert it into a second target voltage through the power conversion module and the high-voltage box module, and provide it to the DC bus; and in the process of discharging the supercapacitor module, obtain the power of the supercapacitor module; when the power of the supercapacitor module has dropped to the minimum capacity, stop discharging the supercapacitor module.

[0120] It should be noted that the module referred to in this application refers to a series of computer program instruction segments that can perform specific functions, which is more suitable for describing the execution process of generating a start signal than a program. For the specific implementation methods of each unit, please refer to the corresponding method embodiments above, which will not be repeated here.

[0121] Those skilled in the art will clearly understand that, for the convenience and brevity of description, the specific working processes of the above-described equipment, devices and units can refer to the corresponding processes in the aforementioned method embodiments, and will not be repeated here. Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented with electronic hardware, computer software or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of this application.

[0122] In the several embodiments provided in this application, it should be understood that the disclosed devices, apparatuses and methods can be implemented in other ways. For example, the device embodiments described above are merely schematic. For example, the division of the units is merely a logical function division. In actual implementation, there may be other division methods, or units with the same function may be combined into one unit. For example, multiple units or components may be combined or integrated into another device, or some features may be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed may be an indirect coupling or communication connection through some interfaces, devices or units, or may be an electrical, mechanical or other form of connection.

[0123] The units described as separate components may or may not be physically separate, and the components shown as units may or may not be physical units, that is, they may be located in one place or distributed across multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the embodiments of the present application.

[0124] In addition, the functional units in the various embodiments of the present application may be integrated into a single processing unit, or each unit may exist physically separately, or two or more units may be integrated into a single unit. The aforementioned integrated units may be implemented in the form of hardware or software functional units.

[0125] If the integrated unit is implemented as a software functional unit and sold or used as an independent product, it can be stored in a storage medium. Based on this understanding, the technical solution of this application, or the part that contributes to the existing technology, or all or part of the technical solution can be embodied in the form of a software product. This computer software product is stored in a storage medium and includes several instructions for causing a computer device to execute all or part of the steps of the method described in each embodiment of this application. The aforementioned storage medium includes: USB flash drives, mobile hard drives, read-only memories, magnetic disks, optical disks, and other media that can store program code.

[0126] The above description is merely a specific embodiment of the present application, but the scope of protection of the present application is not limited thereto. Any person skilled in the art can easily conceive of various equivalent modifications or substitutions within the technical scope disclosed in the present application, and such modifications or substitutions should be included in the scope of protection of the present application. Therefore, the scope of protection of the present application should be based on the scope of protection of the claims.

Claims

1. An energy-saving elevator system, comprising: An elevator motor, an AC power supply, and a frequency converter for driving the elevator motor via the AC power supply, wherein the energy-saving elevator system further comprises: an electric energy conversion module, wherein a first connection end of the electric energy conversion module is connected to the DC bus of the inverter, and is configured to draw electric energy from the DC bus, convert it into a first target voltage, and output it from the second connection end, or receive electric energy from the second connection end, convert it into a second target voltage, and then provide it to the DC bus; a supercapacitor module having a capacitor connection terminal for storing electrical energy received through the capacitor connection terminal or outputting stored electrical energy through the capacitor connection terminal; a high-voltage box module, one end of which is connected to the second connection end of the electric energy conversion module, and the other end of which is connected to the capacitor connection end of the supercapacitor module; An energy management module, the energy management module being communicatively connected to the power conversion module, the high-voltage box module, and the supercapacitor module respectively; The energy management module is configured to: when the elevator motor is in a first state, store the electric energy of the DC bus in the supercapacitor module through the electric energy conversion module and the high-voltage box module; and when the elevator motor is in a second state, output the electric energy stored in the supercapacitor module to the DC bus of the inverter through the high-voltage box module and the electric energy conversion module; The high-voltage box module includes: a third connection terminal, the third connection terminal being connected to the electric energy conversion module, the third connection terminal comprising a third high potential connection terminal and a third low potential connection terminal; a fourth connection terminal, the fourth connection terminal being connected to the supercapacitor module; the fourth connection terminal comprising a fourth high-potential connection terminal and a fourth low-potential connection terminal; a main circuit allowing direct current to pass between the third connection terminal and the fourth connection terminal, which are composed of a pair of high-potential connection terminals and a low-potential connection terminal; a positive contactor, one end of which is connected to the third high-potential connection terminal, and the other end of which is connected to the fourth high-potential connection terminal, for controlling the on or off of the main circuit; a pre-charging resistor and a pre-charging contactor, one end of the pre-charging resistor being connected to the third high-potential connection terminal, and the other end of the pre-charging resistor being connected to the fourth high-potential connection terminal via the pre-charging contactor, thereby forming a pre-charging circuit in parallel with the main circuit; the pre-charging contactor being used to control the conduction or disconnection of the pre-charging circuit; a shunt, the shunt being connected to the third low-potential connection terminal and the fourth low-potential connection terminal respectively, and being used to collect a current current value; A high-voltage box control unit is connected to the shunt and is used to control the positive contactor and the pre-charge contactor according to the collected current value.

2. The energy-saving elevator system according to claim 1, characterized in that: The power conversion module includes: a voltage conversion unit, a first switch, a first fuse, a second switch and a second fuse; The high voltage connection end of the voltage conversion unit is the first connection end, which forms a first electrical connection loop with the DC bus, and the low voltage connection end of the voltage conversion unit is the second connection end, which forms a second electrical connection loop with the high voltage box module. The first switch is provided on the first electrical connection loop, and is used to control the on or off of the first electrical connection loop; the first fuse is provided in the first electrical connection loop, and is used to protect the voltage conversion unit; The second switch is provided on the second electrical connection circuit, and is used to control the conduction or disconnection of the second electrical connection circuit; the second fuse is provided in the second electrical connection circuit, and is used to protect the high-voltage box module.

3. The energy-saving elevator system according to claim 2, characterized in that: The voltage conversion unit further includes: an AC power supply end; the AC power supply end is connected to the AC power supply and is used to draw electrical energy from the AC power supply.

4. The energy-saving elevator system according to claim 2, characterized in that: The power conversion module further includes: an interactive control device and a wireless communication unit; In which, the interactive control device is connected to the voltage conversion unit for receiving user instructions, controlling the voltage conversion unit and / or displaying the operating status of the voltage conversion unit, and the wireless communication unit is connected to the voltage conversion unit for establishing a wireless communication connection between an external device and the voltage conversion unit.

5. The energy-saving elevator system according to claim 1, characterized in that: The high-voltage box module also includes: a circuit breaker and a fuse; The circuit breaker is connected to the third connection terminal and the fourth connection terminal respectively, and is used to simultaneously shut down the main circuit and the pre-charging circuit; One end of the fuse is connected to the common connection node of the pre-charge contactor and the positive contactor, and the other end of the fuse is connected to the fourth high potential connection terminal, for protecting the supercapacitor module.

6. The energy-saving elevator system according to claim 1, characterized in that: The high-voltage box module also includes: a switching power supply, a status indicator light and a communication interface; The switching power supply is connected to the third connection terminal and the fourth connection terminal respectively, and is used to draw power from the main circuit or the pre-charge circuit to power the high-voltage box control unit; The status indicator light is connected to the high-voltage box control unit and is used to indicate the current working status of the high-voltage box module; The communication interface is connected to the high-voltage box control unit and is used to establish a communication connection with the supercapacitor module and / or the energy management module.

7. The energy-saving elevator system according to claim 1, characterized in that: The supercapacitor module includes: A capacitor array, wherein the capacitor array is formed by connecting a plurality of capacitors in sequence; a capacitor control board, the capacitor control board being electrically connected to the capacitor array and being used to collect the temperature of each capacitor in the capacitor array and the voltage and current values ​​of each capacitor; The capacitor control board has a positive connection terminal and a negative connection terminal, the positive connection terminal is connected to the fourth high potential connection terminal, and the negative connection terminal is connected to the fourth low potential connection terminal.

8. A control method for an energy-saving elevator system, applied to the energy-saving elevator system according to any one of claims 1 to 7, characterized in that: The method comprises: Get the voltage value of the DC bus of the inverter; When the voltage value is greater than or equal to a preset threshold, determining that the elevator motor is in a first state; Starting the power conversion module and the high-voltage box module, and converting the power of the DC bus into a first target voltage through the power conversion module and the high-voltage box module to charge the supercapacitor module; During the charging process of the supercapacitor module, obtaining the amount of electricity of the supercapacitor module; When the power of the supercapacitor module has reached the maximum capacity, stopping charging the supercapacitor module; When the voltage value is less than the preset threshold, determining that the elevator motor is in the second state; Starting the power conversion module and the high-voltage box module, so that the supercapacitor module discharges and converts the discharge voltage into a second target voltage through the power conversion module and the high-voltage box module, and provides the second target voltage to the DC bus; During the discharge of the supercapacitor module, obtaining the amount of electricity of the supercapacitor module; When the power of the supercapacitor module has dropped to a minimum capacity, stopping the supercapacitor module from discharging; The high-voltage box module includes: a third connection terminal, the third connection terminal being connected to the electric energy conversion module, the third connection terminal comprising a third high potential connection terminal and a third low potential connection terminal; a fourth connection terminal, the fourth connection terminal being connected to the supercapacitor module; the fourth connection terminal comprising a fourth high-potential connection terminal and a fourth low-potential connection terminal; a main circuit allowing direct current to pass between the third connection terminal and the fourth connection terminal, which are composed of a pair of high-potential connection terminals and a low-potential connection terminal; a positive contactor, one end of which is connected to the third high-potential connection terminal, and the other end of which is connected to the fourth high-potential connection terminal, for controlling the on or off of the main circuit; a pre-charging resistor and a pre-charging contactor, one end of the pre-charging resistor being connected to the third high-potential connection terminal, and the other end of the pre-charging resistor being connected to the fourth high-potential connection terminal via the pre-charging contactor, thereby forming a pre-charging circuit in parallel with the main circuit; the pre-charging contactor being used to control the conduction or disconnection of the pre-charging circuit; a shunt, the shunt being connected to the third low-potential connection terminal and the fourth low-potential connection terminal respectively, and being used to collect a current current value; A high-voltage box control unit is connected to the shunt and is used to control the positive contactor and the pre-charge contactor according to the collected current value.

9. The control method according to claim 8, characterized in that: After determining that the elevator motor is in the first state and before charging the supercapacitor module, the method further includes: Obtaining the power of the supercapacitor module; When the power of the supercapacitor module has reached the maximum capacity, the power conversion module and the high-voltage box module are not started to charge the supercapacitor module; Alternatively, before determining that the elevator motor is in the second state and discharging the supercapacitor module, the method further includes: Obtaining the power of the supercapacitor module; When the electric quantity of the super capacitor module has been reduced to the minimum capacity, the electric energy conversion module and the high-voltage box module are not started, so that the super capacitor module does not discharge.

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