Elevator energy consumption management method, elevator energy storage system and storage medium

Abstract

The invention relates to an elevator energy consumption management method, an elevator energy storage system and a storage medium, and is applied to the field of elevators and host equipment of the elevator energy storage system.The elevator energy consumption management method comprises the steps that first load end current of the host equipment and second load end current of slave equipment are obtained, acquiring a bus voltage value of the elevator frequency converter; based on a current difference value between the first load end current and the second load end current, a current adjusting signal is sent to the slave device to synchronize the first load end current of the host device and the second load end current of the slave device, and / or based on the bus voltage value, a voltage adjusting signal is sent to the slave device to synchronize the first load end current of the host device and the second load end current of the slave device. And the load end voltages of the host equipment and the slave equipment are synchronized. According to the elevator energy storage system, the application range, the system energy efficiency and the stability of the elevator energy storage system are improved.

Description

Technical Field

[0001] The present application relates to the field of elevators, and particularly to an elevator energy consumption management method, an elevator energy storage system, and a storage medium. Background Art

[0002] With the acceleration of the urbanization process, elevators, as important energy-consuming devices in buildings, have a great impact on the overall building energy efficiency in terms of energy consumption management.

[0003] In the prior art, an elevator energy storage system is often used to store electric energy in the elevator power generation mode and supply electric energy in the elevator electric mode to save energy. The elevator energy storage system is set for the elevator corresponding to energy consumption management, so its applicable range is limited. For other application scenarios beyond the elevator load range, such as elevators with higher floors or larger loads, the load power of the elevator energy storage system cannot match. At the same time, the load of each elevator changes during the operation of the elevator system, and the power requirements for the elevator energy storage system are very different in the case of heavy load and light load. The traditional elevator energy storage system cannot adapt to the changing requirements of such loads, resulting in low system energy efficiency.

[0004] In view of the problem that the applicable range of the elevator energy storage system in the related technology is narrow and the system energy efficiency needs to be improved, no effective solution has been proposed yet. Summary of the Invention

[0005] In this embodiment, an elevator energy consumption management method, an elevator energy storage system, and a storage medium are provided to solve the problems that the applicable range of the elevator energy storage system in the related technology is narrow and the system energy efficiency needs to be improved.

[0006] In a first aspect, in this embodiment, an elevator energy consumption management method is provided. The method is applied to the main device of the elevator energy storage system. The elevator energy storage system includes an energy storage device and an elevator frequency converter. The energy storage device is connected to the elevator frequency converter. The energy storage device includes the main device and at least one slave device. The main device and the slave device are communicatively connected and are configured in a parallel load mode. The method includes:

[0007] Obtain a first load terminal current of the main device, a second load terminal current of the slave device, and a bus voltage value of the elevator frequency converter;

[0008] Based on the current difference between the first load terminal current and the second load terminal current, send a current adjustment signal to the slave device to synchronize the first load terminal current of the main device and the second load terminal current of the slave device, and / or based on the bus voltage value, send a voltage adjustment signal to the slave device to synchronize the load terminal voltages of the main device and the slave device.

[0009] In some of these embodiments, before obtaining the first load terminal current of the host device and the second load terminal current of the slave device, it includes:

[0010] In response to the start signal of the elevator energy storage system, send an identification request to the initial slave device in the energy storage device through any device in the energy storage device; any device in the energy storage device is the initial host device, and the initial slave device includes other devices in the energy storage device except the initial host device;

[0011] When the initial slave device responds to the identification request, obtain the identifier of the initial slave device;

[0012] Determine the host device and at least one slave device in the energy storage device according to the identifier; the slave device includes other devices in the energy storage device except the host device.

[0013] In some of these embodiments, based on the current difference between the first load terminal current and the second load terminal current, sending a current regulation signal to the slave device includes:

[0014] Judge whether the current difference between the first load terminal current and the second load terminal current exceeds a preset current threshold;

[0015] When the current difference exceeds the preset current threshold, adjust the first load terminal current through PID control and generate the current regulation signal to send to the slave device, so that the slave device adjusts the second load terminal current of the slave device according to the current regulation signal until the difference between the first load terminal current and the second load terminal current does not exceed the preset current threshold.

[0016] In some of these embodiments, based on the bus voltage value, sending a voltage regulation signal to the slave device to synchronize the load terminal voltages of the host device and the slave device includes:

[0017] Based on the bus voltage value, adjust the first load terminal voltage of the host device and generate the voltage regulation signal to send to the slave device, so that the slave device adjusts the second load terminal voltage of the slave device according to the voltage regulation signal until the first load terminal voltage of the host device, the second load terminal voltage of the slave device and the bus voltage value are consistent.

[0018] In some of these embodiments, before sending the current regulation signal to the slave device, and / or sending the voltage regulation signal to the slave device, it includes:

[0019] Send a synchronization signal to the slave device according to a preset time interval, where the synchronization signal carries a time stamp, so that the slave device can check whether the time of the slave device is consistent with the time stamp;

[0020] According to the feedback of the slave device, when it is determined that the time of the slave device is consistent with the time stamp, send the current regulation signal and / or the voltage regulation signal to the slave device; or when it is determined that the time of the slave device is inconsistent with the time stamp, resend the synchronization signal to the slave device according to the time interval.

[0021] In some embodiments, the method further includes:

[0022] Based on the bus voltage value of the elevator frequency converter, determine the fluctuation amplitude and fluctuation intensity of the bus voltage signal of the elevator frequency converter;

[0023] According to the comparison results of the fluctuation amplitude and the fluctuation intensity with a preset charge and discharge threshold range respectively, switch to control the charge and discharge process of the energy storage device to the bus of the elevator frequency converter.

[0024] In some embodiments, the determining the fluctuation amplitude and fluctuation intensity of the bus voltage signal of the elevator frequency converter based on the bus voltage value of the elevator frequency converter includes:

[0025] Obtain multiple bus voltage values of the elevator frequency converter within a preset period;

[0026] Determine the voltage peak difference between the voltage peak and the voltage valley among the multiple bus voltage values, and determine the fluctuation amplitude of the bus voltage signal fluctuation according to the voltage peak difference;

[0027] Determine the root mean square value of the voltage of the multiple bus voltage values, and determine the fluctuation intensity of the bus voltage signal fluctuation according to the root mean square value of the voltage.

[0028] In some embodiments, the charge and discharge thresholds include a first charge threshold, a second charge threshold, a first discharge threshold, and a second discharge threshold; the first charge threshold is greater than the first discharge threshold; the second charge threshold is greater than the second discharge threshold;

[0029] The switching to control the charge and discharge process of the energy storage device to the bus of the elevator frequency converter according to the comparison results of the fluctuation amplitude and the fluctuation intensity with a preset charge and discharge threshold range respectively includes:

[0030] When it is determined that the peak voltage difference is greater than the first charging threshold and the root mean square voltage value is greater than the second charging threshold, the electrical energy of the elevator frequency converter bus is received, and a received electrical energy signal is sent to the slave device so that the slave device receives the electrical energy of the elevator frequency converter bus;

[0031] When it is determined that the peak voltage difference is less than the first discharging threshold and the root mean square voltage value is less than the second discharging threshold, electrical energy is released to the elevator frequency converter bus, and a released electrical energy signal is sent to the slave device so that the slave device releases electrical energy to the elevator frequency converter bus.

[0032] In a second aspect, in the present embodiment, an elevator energy storage system is provided, and the system includes: an energy storage device and an elevator frequency converter; the energy storage device is connected to the elevator frequency converter; the energy storage device is used to release energy to the elevator frequency converter and is also used to absorb the energy transmitted by the elevator frequency converter;

[0033] The energy storage device includes a host device, and the host device is used to execute the elevator energy consumption management method according to any one of the first aspects.

[0034] In some of the embodiments, the energy storage device further includes at least one slave device, and the host device is respectively communicatively connected to the at least one slave device; the slave device is used to execute the current regulation signal and / or voltage regulation signal of the host device.

[0035] In a third aspect, in the present embodiment, a storage medium is provided, on which a computer program is stored, and when the program is executed by a processor, the elevator energy consumption management method according to the first aspect is implemented.

[0036] Compared with the related art, an elevator energy consumption management method, an elevator energy storage system and a storage medium provided in the present embodiment communicate with each other in real time between the host device and the slave device in the energy storage device, and are connected in parallel at the load end; the host device receives the real-time load end currents of each slave device and itself, calculates the current differences between each slave device and itself, and synchronously adjusts the load end currents of the host device and the slave devices according to the current differences through a load regulation and balancing algorithm - PID control algorithm; and obtains the bus voltage value of the elevator frequency converter, and sends a voltage regulation signal to the slave device according to the bus voltage value to synchronously adjust the load end voltages of the host device and the slave devices, and then flexibly adjusts the parallel power of the load ends of the host device and the slave devices according to the load conditions, expands the applicable range of the elevator energy storage system, optimizes the energy utilization efficiency and system stability of the elevator at the same time, and improves the system energy efficiency of the elevator energy storage system.

[0037] Details of one or more embodiments of the present application are set forth in the following drawings and description to make other features, objects, and advantages of the present application more concise and understandable. Description of the Drawings

[0038] The drawings described herein are used to provide a further understanding of the present application and form a part of the present application. The illustrative embodiments of the present application and their descriptions are used to explain the present application and do not constitute an improper limitation of the present application. In the drawings:

[0039] Figure 1 is a schematic diagram of an elevator energy storage system provided by an embodiment of the present application;

[0040] Figure 2 is a flowchart of an elevator energy consumption management method provided by an embodiment of the present application;

[0041] Figure 3 is a flowchart of a current regulation method provided in an embodiment of the present application;

[0042] Figure 4 is a structural block diagram of an elevator energy storage system provided by this specific embodiment;

[0043] Figure 5 is a flowchart of an energy storage control method provided by an embodiment of the present application.

[0044] Reference Numerals: 100, elevator energy storage system; 10, energy storage device; 20, elevator frequency converter; 11, host device; 12, slave device. Detailed Embodiments

[0045] To more clearly understand the purpose, technical solution, and advantages of the present application, the present application will be described and illustrated below with reference to the drawings and embodiments.

[0046] Unless otherwise defined, the technical terms or scientific terms involved in this application shall have the general meanings understood by those with ordinary skills in the technical field to which this application belongs. In this application, words such as "a", "an", "one kind", "the", "these" and the like do not indicate a limitation in quantity, and they can be singular or plural. The terms "including", "comprising", "having" and any variants thereof involved in this application are intended to cover non-exclusive inclusion; for example, a process, method, system, product or device comprising a series of steps or modules (units) is not limited to the listed steps or modules (units), but may include unlisted steps or modules (units), or may include other steps or modules (units) inherent in these processes, methods, products or devices. The similar words such as "connected", "linked", "coupled" and the like involved in this application are not limited to physical or mechanical connections, but may include electrical connections, whether direct or indirect. The "plurality" involved in this application means two or more. "And / or" describes the association relationship of associated objects and indicates that three relationships can exist. For example, "A and / or B" can represent three situations: A exists alone, A and B exist simultaneously, and B exists alone. Usually, the character " / " indicates that the objects associated before and after are in an "or" relationship. The terms "first", "second", "third" and the like involved in this application are only used to distinguish similar objects and do not represent a specific sorting of the objects.

[0047] With the acceleration of the urbanization process, elevators, as important energy-consuming devices in buildings, have a great impact on the overall building energy efficiency in terms of their energy consumption management. Elevator energy storage systems mainly rely on mains power supply and cannot provide sufficient backup energy in case of power outage or other emergencies. At the same time, for application scenarios beyond the load range of the elevator, such as elevators with higher floors or larger load capacities, there will be a situation where the load power of the elevator energy storage system cannot match. Therefore, the applicable range of elevator energy storage systems is relatively narrow; and due to the large difference in the power requirements for elevator energy storage systems under different elevator load conditions, the system energy efficiency of existing elevator energy storage systems cannot adapt to a variety of application scenarios with different powers. Therefore, the overall energy efficiency, applicable range and reliability in current elevator energy storage systems need to be improved urgently.

[0048] In this embodiment, an elevator energy storage system is provided. Through the elevator energy storage system, the energy management of the energy storage device is optimized. The system includes: an energy storage device and an elevator frequency converter; the energy storage device is connected to the elevator frequency converter; the energy storage device is used to release energy to the elevator frequency converter and also used to absorb the energy transmitted by the elevator frequency converter; the energy storage device includes a host device, and the host device is configured to run a computer program to execute the cascading of the host device and slave devices and the elevator energy consumption management method of synchronizing the current and voltage among multiple energy storage devices. The energy storage device further includes at least one slave device, and the host device is respectively communicatively connected to at least one slave device; the slave device is used to receive the voltage regulation signal and / or current regulation signal of the host device and perform dynamic regulation of voltage and / or current according to the regulation signal.

[0049] Reference Figure 1 , Figure 1 FIG. is a schematic diagram of the elevator energy storage system provided by the embodiment of the present application. The elevator energy storage system 100 includes an energy storage device 10 and an elevator frequency converter 20. The energy storage device 10 and the elevator frequency converter 20 are bidirectionally connected. According to the bus voltage value of the elevator frequency converter 20, it is determined whether to control the energy storage device 10 to switch the charge and discharge modes of the bus of the elevator frequency converter 20. The energy storage device 10 includes a plurality of energy storage devices, namely a host device 11 and slave devices 12. Among them, there is exactly one host device 11, and other energy storage devices except the host device 11 are all set as slave devices 12. The host device 11 obtains the bus voltage value of the elevator frequency converter 20, as well as the load terminal current and load terminal voltage values of itself and the slave devices 12, and combines the preset voltage following mechanism, load current balancing algorithm, etc. to achieve the current and voltage synchronization of the host device 11 and the slave devices 12, thereby effectively improving the power load and power utilization efficiency of the elevator energy storage system 100.

[0050] Further, the host device 11 and the slave devices 12 are configured in a load terminal parallel mode and perform data transmission based on a serial communication protocol. Exemplarily, the host device 11 and the slave devices 12 communicate through the CAN (Controller Area Network) protocol, that is, they are connected in parallel through the CAN communication port. CAN communication is a serial communication protocol. The data of CAN communication is transmitted on the bus in the form of "frames", which can support distributed real-time control and has high anti-interference ability. Any node can initiate message transmission on the bus, and the priority of the message is determined by the ID field. High-priority messages can interrupt the transmission of low-priority messages.

[0051] It should be noted that the load terminal is the end where the host device 11 and the slave devices 12 are connected to the elevator frequency converter 20, and is used to input current and voltage through the elevator frequency converter 20 in the charging mode and output current and voltage to the elevator frequency converter 20 in the discharging mode.

[0052] Further, the load connection ports of the host device and the slave device are arranged in parallel. That is, the positive connection port P+ of the protection board discharge of the host device is connected to the positive connection port P+ of the protection board discharge of the slave device, and then connected to the positive connection port P+ of the elevator frequency converter; the negative connection port N- of the protection board discharge of the host device is connected to the N- port of the negative connection port of the protection board discharge of the slave device, and then connected to the negative connection port N- of the elevator frequency converter. The elevator energy storage system may include one host device and multiple slave devices. A memory for storing data is provided in the host device. The memory can be used to store computer programs, such as software programs and modules of application software, such as the computer program corresponding to the elevator energy consumption management method in this embodiment. The host device executes various functional applications and data processing by running the computer program stored in the memory, that is, the above method is implemented. The memory may include a high-speed random access memory, and may also include a non-volatile memory, such as one or more magnetic storage devices, flash memory, or other non-volatile solid-state memories. In some instances, the memory may further include a memory remotely set with respect to the host device, and these remote memories can be connected to the terminal through a network. Examples of the above network include but are not limited to the Internet, enterprise intranet, local area network, mobile communication network, and combinations thereof.

[0053] Further, in order to ensure the stable operation of the elevator energy storage system, broaden the applicable range of the elevator energy storage system, and improve the load power and energy efficiency of the elevator energy storage system, based on the above elevator energy storage system, an elevator energy consumption management method is provided in this embodiment, which is applied to the host device in the energy storage device of the elevator energy storage system. Figure 2 It is a flowchart of the elevator energy consumption management method provided by the embodiment of the present application, as Figure 2 shown. The process includes the following steps:

[0054] Step S210, obtain the first load terminal current of the host device, the second load terminal current of the slave device, and the bus voltage value of the elevator frequency converter.

[0055] Among them, when it is necessary to manage the electric energy stored in the elevator energy storage system, the host device in the elevator energy storage system respectively obtains the first load terminal current of the host device itself, the second load terminal current of the slave device whose electric energy is in parallel with the load terminal of the host device, and the bus voltage value of the elevator frequency converter. Exemplarily, the load terminal current and the bus voltage value are respectively obtained by real-time detection by a current sensor and a voltage sensor within a preset sampling period. The current sensor here can be a Hall sensor or a current transformer, and the voltage sensor here can be a Hall sensor, a resistor divider, a digital voltage sensor, or a voltage transformer, which is not specifically limited here.

[0056] Step S220: Based on the current difference between the first load terminal current and the second load terminal current, send a current regulation signal to the slave device to synchronize the first load terminal current of the master device and the second load terminal current of the slave device, and / or based on the bus voltage value, send a voltage regulation signal to the slave device to synchronize the load terminal voltages of the master device and the slave device.

[0057] Among them, after obtaining the first load terminal current and the second load terminal current of the master device and the slave device, calculate the current difference between the first load terminal current and the second load terminal current, and generate a current regulation signal according to this current difference. If this current difference does not exceed the preset current threshold and is negligible, then there is no need to generate a current regulation signal according to this current difference; if this current difference exceeds the preset current threshold, the master device adjusts its own load terminal current and generates a current regulation signal according to this current difference. After generating the current regulation signal, the master device sends this current regulation signal to the slave device. After receiving this current regulation signal, the slave device adjusts the load terminal current to achieve the synchronization of the load terminal currents of the master device and the slave device, ensuring that the current difference between the load terminal currents of the master device and the slave device does not exceed the preset current threshold, that is, the load terminal currents of the master device and the slave device are close or even the same.

[0058] After the master device obtains the real-time bus voltage value of the elevator frequency converter, adjust its own voltage and generate a voltage regulation signal according to the voltage change situation of the bus voltage value within the acquisition period; after generating the voltage regulation signal, the master device sends this voltage regulation signal to the slave device. After receiving this voltage regulation signal, the slave device adjusts the load terminal voltage to achieve the synchronization of the load terminal voltages of the master device and the slave device, that is, the load terminal voltages of the master device and the slave device are close until the load terminal voltage of the master device, the load terminal voltage of the slave device, and the bus voltage value of the elevator frequency converter are consistent.

[0059] Further, the absolute value of the current difference between the first load terminal current and the second load terminal current is taken for subsequent judgment here.

[0060] Through the above steps, the master device and slave devices in the energy storage device are connected in real-time communication, and the load terminal voltage and current are paralleled; the master device receives the real-time load terminal currents of each slave device and itself, calculates the current differences between each slave device and itself, and synchronizes the load terminal currents of the master device and slave devices according to the current differences through a load regulation and balancing algorithm; and obtains the bus voltage value of the elevator frequency converter, generates a voltage regulation signal according to the bus voltage value, and sends the bus voltage value and the voltage regulation signal to the slave devices, so that the slave devices synchronize the load terminal voltages of the master device and slave devices according to the voltage regulation signal, so that the load terminal voltages of the master device, slave devices and the bus voltage value of the elevator frequency converter are kept consistent, and flexibly adjusts the parallel power of the load terminals of the master device and slave devices according to the load conditions, so that the load powers of the master device and slave devices are evenly distributed, so as to expand the applicable range of the elevator energy storage system, and further optimize the energy utilization efficiency and system stability of the elevator, and improve the system energy efficiency of the elevator energy storage system.

[0061] In some of these embodiments, before obtaining the first load terminal current of the master device and the second load terminal current of the slave device, it includes: in response to the start signal of the elevator energy storage system, any device in the energy storage device sends an identification request to the initial slave device in the energy storage device; any device in the energy storage device is the initial master device, and the initial slave device includes other devices in the energy storage device except the initial master device; when the initial slave device responds to the identification request, obtain the identifier of the initial slave device; determine the master device and multiple slave devices in the energy storage device according to the identifier; the slave devices include other devices in the energy storage device except the master device.

[0062] Among them, when the elevator energy storage system starts, obtain the start signal of the elevator energy storage system, and randomly determine any device in the energy storage device as the initial master device, and determine that other devices except the initial master device are all initial slave devices; thereafter, the initial master device acts as the master device and sends an identification request to the initial slave device in the energy storage device; when the initial slave device responds to the identification request sent by the initial master device, send a signal carrying its own identifier to the initial master device, and the initial master device determines the master device in the energy storage device according to its own identifier and the identifier of the initial slave device. Exemplarily, the identifier includes the contract number code, device model, device parameters, firmware version number, communication interface type, communication protocol, etc. of the devices in the energy storage device. Here, taking the contract number code as an example, a unique identity is assigned to each device according to the contract number. For example, the device with the contract number code sorted at the front is determined as the master device, and the rest of the devices are all slave devices. In an elevator energy storage system, there is one and only one master device, and there is at least one slave device.

[0063] In some of these embodiments, Figure 3It is a flowchart of the current regulation method provided in the embodiments of the present application. Refer to Figure 3 , in step S220, based on the current difference between the first load terminal current and the second load terminal current, sending a current regulation signal to the slave device includes:

[0064] Step S221, determining whether the current difference between the first load terminal current and the second load terminal current exceeds a preset current threshold.

[0065] Among them, when the first load terminal current and the second load terminal current corresponding to the master device and the slave device are monitored, the master device calculates the current difference between the first load terminal current and the second load terminal current, and then judges the magnitude of the current difference and the preset current threshold, that is, judges whether it is necessary to adjust the load terminal current of the slave device to ensure load balance.

[0066] Step S222, when the current difference exceeds the preset current threshold, adjusting the first load terminal current through PID control and generating a current regulation signal to be sent to the slave device, so that the slave device adjusts the second load terminal current of the slave device according to the current regulation signal until the difference between the first load terminal current and the second load terminal current does not exceed the preset current threshold.

[0067] Among them, when it is determined that the current difference exceeds the preset current threshold, it means that the load of the master device and the slave device is unbalanced at this time. It is necessary to re-adjust the load terminal current of the master device and the slave device according to the preset balancing algorithm according to the current difference, so that the difference between the first load terminal current and the second load terminal current does not exceed the preset current threshold, that is, the load terminal currents of the master device and the slave device are close or even the same. Specifically, the preset balancing algorithm can be a balancing algorithm based on PID (Proportion Integration Differentiation), or a fuzzy control method based on fuzzy logic, or a balancing algorithm based on neural network control, which is not specifically limited here. Preferably, the master device adjusts the first load terminal current through the PID control algorithm based on its own real-time first load terminal current and the real-time second load terminal current received from the slave device, generates a current regulation signal and sends it to the slave device, and the slave device adjusts the second load terminal current according to the current regulation signal, so that the current difference does not exceed the preset current threshold; thus, the adjustment process is smoothed and overshoot is avoided, and the load distribution is accurately adjusted.

[0068] Exemplarily, when the current of the first load terminal of the host device is monitored to be 17 A, the current of the second load terminal of the slave device is 15 A, and the rated current of both the host device and the slave device is 17 A, at this time, the current difference between the load terminal currents of the host device and the slave device is 2 A, and the preset current threshold is 5% of the rated current. Then, since the current difference is greater than the preset current threshold, the host needs to adjust the load distribution according to the current difference so that the load terminal currents of both the host device and the slave device are 16 A, and the current difference is lower than the current threshold, making the first load terminal current and the second load terminal current consistent to achieve load current balance.

[0069] In some of these embodiments, in step S220, based on the bus voltage value, a voltage regulation signal is sent to the slave device to synchronize the load terminal voltages of the host device and the slave device, including: adjusting the first load terminal voltage of the host device based on the bus voltage value and generating a voltage regulation signal to be sent to the slave device, so that the slave device adjusts the second load terminal voltage of the slave device according to the voltage regulation signal until the first load terminal voltage of the host device, the second load terminal voltage of the slave device, and the bus voltage value are consistent.

[0070] Among them, after collecting multiple bus voltage values of the elevator frequency converter through a voltage sensor, according to the voltage change condition of the multiple bus voltage values, the real-time first load terminal voltage of itself is adjusted, and a voltage regulation signal is generated and sent to the slave device to ensure that the second load terminal voltage of the slave device and the first load terminal voltage of the host device are synchronized. When the slave device receives this voltage regulation signal, it will adjust the second load terminal voltage according to the voltage regulation signal to make the second load terminal voltage of the slave device consistent with the first load terminal voltage of the host device until the first load terminal voltage of the host device, the second load terminal voltage of the slave device, and the bus voltage value of the elevator frequency converter are consistent, thereby helping to stabilize the voltage level of the entire system to avoid the impact of voltage fluctuations on system operation.

[0071] Furthermore, the bus capacity of the elevator frequency converter is very large and the bus voltage is very stable. In the current working state of the elevator energy storage system, the load ports in both the host device and the slave device are connected in parallel to the bus of the elevator frequency converter to supply power to the bus voltage of the elevator frequency converter; since the load power of the host device / slave device is small, increasing the load terminal voltages of the host device and the slave device will be pulled down by the large-capacity bus voltage. Then, it is necessary to continuously increase the load terminal voltages of the host device and the slave device to increase the parallel power of the load terminals of the host device and the slave device. However, each time it is increased, it will be pulled down by the bus voltage again. The whole process is dynamically adjusted so that the load terminal voltages of both the slave device and the host device are continuously approaching and finally the same as the bus voltage of the elevator frequency converter.

[0072] Through the above steps, in combination with the bus voltage value of the elevator frequency converter, the host device adjusts the voltage at its own load terminal according to the change of the converter bus voltage and sends an adjustment signal to the slave device, ensuring that the voltage at the load terminal of the slave device is synchronized with the voltage at the load terminal of the host device until the voltage at the load terminal of the host device, the voltage at the load terminal of the slave device, and the bus voltage value are consistent, so as to ensure stable operation when the host device and the slave device are connected in parallel, thereby improving the energy efficiency of the elevator energy storage system and increasing the load power.

[0073] In some of these embodiments, before sending a current adjustment signal to the slave device and / or sending a voltage adjustment signal to the slave device, it includes: sending a synchronization signal to the slave device according to a preset time interval, where the synchronization signal carries a timestamp, so that the slave device can check whether the time of the slave device is consistent with the timestamp.

[0074] When it is determined according to the feedback of the slave device that the time of the slave device is consistent with the timestamp, a current adjustment signal and / or a voltage adjustment signal is sent to the slave device; or when it is determined that the time of the slave device is inconsistent with the timestamp, a synchronization signal is resent to the slave device according to the time interval.

[0075] Among them, there is exactly one host device in the energy storage device, but there can be multiple slave devices. Before the host device sends a voltage / current adjustment signal to the slave device according to the load terminal current difference and / or the bus voltage value, it is necessary to ensure that the communication instructions of one or more slave devices and the host device are synchronized. Therefore, the host device needs to regularly send a synchronization signal to multiple slave devices within a preset time interval to ensure that the slave devices are synchronized with the host device in time, can receive the current system status synchronously, so that the status of the host device and the slave device is always consistent, and avoid problems of inaccurate control caused by communication delay or packet loss; the synchronization signal includes a timestamp and can also include system status such as current and voltage.

[0076] The slave device checks the current status of the slave device according to the system status included in the synchronization signal and verifies whether the timestamp carried in the received synchronization signal is consistent with the time of this slave device. If they are consistent, the slave device receives the current adjustment signal and the voltage adjustment signal sent by the host device to synchronize the current and voltage status; if the timestamps are inconsistent, the slave device requests the host device to send a synchronization signal again and performs the above verification again to coordinate the data exchange between the host device and the slave device, ensure instruction synchronization, and avoid the situation of asynchronous current and voltage status caused by delay or packet loss.

[0077] The following describes and illustrates this embodiment through specific examples.

[0078] Figure 4It is the structural block diagram of the elevator energy storage system provided by this specific embodiment. As Figure 4 shown, the elevator energy storage system includes a master device and slave devices, that is, Figure 4 the energy storage device 1 and the energy storage device 2 in

[0079] Here, the number of slave devices is one only for illustration, and the actual number of slave devices is at least one and is determined according to specific elevator requirements. The master device and the slave devices exchange data through the CAN communication protocol. The elevator energy storage system can adjust the load current at the load ends of the master and slave devices to be consistent according to the load current balancing algorithm, and the voltage following mechanism keeps the voltages of the master and slave devices consistent, and automatically assigns the master and slave identities of the devices through the master encoding.

[0080] In one specific embodiment, this application combines the load current balancing algorithm, the communication synchronization algorithm, the voltage following mechanism, and the master encoding automatic assignment mechanism to realize the cascade of the master device and the slave devices in the energy storage device, and effectively improve the power load and the power utilization efficiency of the system, so as to optimize the energy utilization efficiency and the system stability of the elevator energy storage system.

[0081] Among them, the load current balancing algorithm monitors the load currents of the two devices in real time, and the master calculates the current difference to adjust the slave load to ensure load balance. If the device is overloaded or unbalanced, the master will automatically adjust the load distribution according to the current deviation.

[0082] Specifically, real-time current sampling: Each device samples the load current at the load end in real time through a Hall sensor or a current transformer, and the data is transmitted to the master in real time through the CAN bus. After receiving the current data of the slave device and its own device, the master device calculates the current difference according to the absolute value of the difference between I1 and I2, and the formula is expressed as:

[0083] ΔI = |I1 - I2|

[0084] Among them, I1 and I2 respectively represent the first load terminal current of the host device and the second load terminal current of the slave device. If the current difference exceeds a predetermined threshold (for example, set to ±5%), the host device will adjust the device load according to the current difference. Further, in order to smooth the adjustment process and avoid overshoot, the host device precisely adjusts the load distribution through a PID (Proportion Integration Differentiation) controller. The control method of the PID controller is expressed by the formula:

[0085] U(t) = Kp × e(t) + Ki × ∫0 t e(t)dt + Kd × de(t) / dt

[0086] Among them, e(t) is the current error at present, and Kp, Ki, and Kd are the proportional, integral, and differential gains respectively.

[0087] The voltage following mechanism ensures that the parallel host device and slave device are consistent in terms of voltage. The host device monitors the bus voltage value of the elevator frequency converter in real time and sends a voltage regulation signal to the slave device to ensure that the load voltage of the slave device is synchronized with the host voltage, thereby avoiding the impact of voltage fluctuations on the operation of the energy storage device.

[0088] The host device monitors the bus voltage value of the elevator frequency converter in real time through a voltage sensor. The host device sends the real-time voltage data to the slave device through the CAN communication protocol. The host device sends a voltage regulation signal to the slave device according to the change of the elevator frequency converter bus voltage to ensure that the load terminal voltage of the slave device is synchronized with the load terminal voltage of the host device. The slave device adjusts the load terminal voltage using a bidirectional DCDC voltage converter according to the voltage adjustment signal sent by the host device to ensure the synchronization of the load terminal voltage.

[0089] In the elevator energy storage system, synchronous control is carried out between the host device and the slave device through the CAN communication protocol. By transmitting synchronous signals containing timestamps in real time, it is ensured that the states of the host device and the slave device are always consistent, avoiding problems of inaccurate control caused by communication delay or packet loss.

[0090] Specifically, the host device sends synchronous signals regularly. For example, the host device sends a synchronous signal containing a timestamp every 10 ms to ensure that the slave device can receive the current system state. After receiving the synchronous signal, the slave device checks the current system timestamp. If the timestamp is the same as the current time of the slave device, state synchronization is performed; if the timestamps are inconsistent, the slave device will request the host device to resend the synchronous signal again. After receiving the synchronous signal, the slave device checks the current system state and prepares for synchronous operation.

[0091] Through contract number coding technology, the system can automatically assign the identities of master and slave devices. When the host starts up, it automatically identifies the devices in the system and assigns a unique identity to each device according to the contract number. The slave devices operate according to the instructions of the host to ensure the coordinated operation of the devices.

[0092] Specifically, when the elevator energy storage system starts up, any energy storage device, i.e., the initial host device, sends an identification request to all connected initial slave devices via the CAN bus, and the initial slave devices respond automatically according to the contract number coding. After the initial host device receives the contract numbers of all devices, it determines the master-slave identities of the devices through an internal algorithm. After confirming the host device, the host device sends control instructions to the slave devices according to real-time conditions such as the load situation and system status. The slave devices adjust their loads according to the instructions of the host device to ensure load balance.

[0093] In the above specific embodiments, the automatic allocation mechanism of host coding provides a basis for system startup, ensuring the allocation of master-slave identities and the smooth access of devices. Before operations such as load current balancing, voltage synchronization, and communication synchronization start, the identities of the host and slave devices need to be confirmed first.

[0094] Through the load current balancing algorithm, the current is monitored in real time to ensure uniform load distribution. It relies on the automatic allocation mechanism of host coding to correctly identify the identities of master and slave devices and ensure the transmission of correct control signals. At the same time, the voltage following mechanism requires current balancing to ensure the consistency of load current and voltage.

[0095] The voltage following mechanism works closely with the load current balancing algorithm to ensure voltage synchronization. Voltage synchronization requires the support of communication synchronization to ensure that the slave devices receive the voltage adjustment signals from the host in a timely manner.

[0096] Through the communication synchronization algorithm, the data exchange between the host and slave devices is coordinated to ensure instruction synchronization. It is the basis for the successful operation of all other algorithms, avoiding current and voltage out-of-synchronization caused by delays or packet losses.

[0097] Based on the synergistic effect of the above algorithms, it is ensured that the host device and the slave devices can operate stably when connected in parallel, improving the energy efficiency of the elevator and optimizing the load power.

[0098] In some of these embodiments, Figure 5 is the flowchart of the energy storage control method provided by the embodiment of the present application. Refer to Figure 5 and this method further includes steps S510 to S520.

[0099] Step S510, based on the bus voltage value of the elevator frequency converter, determine the fluctuation amplitude and fluctuation intensity of the bus voltage signal of the elevator frequency converter.

[0100] Among them, the voltage change of the bus voltage value can be judged according to the voltage fluctuation amplitude and fluctuation intensity of the bus voltage value; Exemplarily, within a preset sampling period, such as 50 ms or 100 ms, multiple bus voltage values of the elevator frequency converter are obtained, and then the fluctuation amplitude and fluctuation intensity of the bus voltage signal are determined according to the multiple bus voltage values. Among them, the fluctuation amplitude represents the maximum change amplitude of the voltage signal within a certain period of time. The fluctuation amplitude reflects the voltage change during the operation of the elevator. The fluctuation intensity represents the overall fluctuation range of the bus voltage signal within a period of time, and is used to evaluate the persistence of the bus voltage signal fluctuation. The fluctuation intensity reflects the power demand during the operation of the elevator.

[0101] Here, the fluctuation amplitude of the bus voltage signal can be determined according to the difference between the maximum value and the minimum value, standard deviation, variance, root mean square deviation, etc. among multiple bus voltage values, and is determined according to the actual application scenario requirements in the application, and no specific limitation is made here. The fluctuation amplitude of the bus voltage signal can be determined according to time domain analysis methods such as root mean square value, or can be determined according to frequency domain methods, such as fast Fourier transform, power spectral density, and no specific limitation is made here.

[0102] Step S520, according to the comparison results of the fluctuation amplitude and the fluctuation intensity with the preset charge and discharge threshold ranges respectively, switch to control the charge and discharge process of the energy storage device to the bus of the elevator frequency converter.

[0103] Since the elevator is a balanced system, it generates electricity when the car is empty and going up or full and going down, and the elevator energy storage system can be charged; it consumes electricity when the car is empty and going down or full and going up, and the elevator energy storage system can be discharged. During the daily operation of the elevator, the elevator needs to start, stop, and change speed continuously, so it needs to continuously switch between the power generation mode and the power consumption mode. The continuous switching of the mode will cause frequent fluctuations in the bus voltage; in addition, at the application site of the elevator, there is often a lot of power noise in the power supply voltage of the elevator.

[0104] Furthermore, the elevator energy storage system in the prior art can partially recover the braking energy generated during the operation of the elevator. However, in the case of frequent voltage fluctuations, the judgment of the charge and discharge switching of the traditional energy storage system is easily affected by power noise and voltage fluctuations, resulting in a low accuracy rate of charge and discharge state recognition, untimely charge and discharge, and energy efficiency waste; and frequent switching of the charge and discharge state reduces the system stability and increases unnecessary power consumption.

[0105] In order to further reduce the system energy efficiency, the present application realizes hysteresis control by combining the host device with the fluctuation amplitude and fluctuation intensity of the bus voltage and combining the charge and discharge thresholds, so as to accurately control the charge and discharge switching between the host device and the slave device, and avoid frequent charge and discharge caused by small fluctuations in the bus voltage.

[0106] In some of these embodiments, determining the fluctuation amplitude and fluctuation intensity of the bus voltage signal of the elevator frequency converter based on the bus voltage value of the elevator frequency converter includes: obtaining the bus voltage values of a plurality of elevator frequency converters within a preset period; determining the voltage peak difference between the voltage peak value and the voltage valley value among the plurality of bus voltage values, and determining the fluctuation amplitude of the bus voltage signal fluctuation according to the voltage peak difference; determining the root mean square value of the plurality of bus voltage values, and determining the fluctuation intensity of the bus voltage signal fluctuation according to the root mean square value.

[0107] Specifically, obtain the bus voltage value at a fixed frequency, and use a fixed number of bus voltage values as a period; obtain the voltage peak value, voltage valley value, and root mean square value of the bus voltage values within this period to obtain the fluctuation amplitude and fluctuation intensity. The voltage peak difference can measure the amplitude of the bus voltage signal fluctuation, directly reflecting the voltage change during the operation of the elevator, especially the significant fluctuation during the elevator braking process; the root mean square value of the voltage can represent the continuous intensity of the bus voltage signal fluctuation of the elevator frequency converter, and is suitable for capturing the power demand of the elevator during the operation state. The combination of the two can accurately capture the nodes that need to switch between charge and discharge in the elevator scenario.

[0108] Exemplarily, within the time window of one acquisition period, such as a time window of 100 ms or 200 ms, obtain the maximum value, i.e., the voltage peak value, and the minimum value, i.e., the voltage valley value, of the plurality of bus voltage values in real time, and calculate the difference between the two to obtain the voltage peak difference; then calculate the root mean square value of the plurality of bus voltage values. The specific calculation formula is as follows:

[0109] RMS(V)=sqrt(1 / N×Σ[V i 2 )

[0110] Among them, RMS represents the root mean square value, N represents the number of sampling points of the bus voltage value, V i represents the voltage value of the sampling point, sqrt represents the square root operation, and Σ represents the summation operation.

[0111] That is, calculate the plurality of squared values of the plurality of bus sampling voltage values to obtain a plurality of voltage squared values; sum the plurality of voltage squared values to obtain the sum of voltage squares; calculate the mean square value of the sum of voltage squares according to the number of the plurality of bus sampling voltage values, and calculate the square root of the mean square value to obtain the root mean square value of the voltage.

[0112] In some of these embodiments, the charge and discharge thresholds include a first charge threshold, a second charge threshold, a first discharge threshold, and a second discharge threshold; the first charge threshold is greater than the first discharge threshold; the second charge threshold is greater than the second discharge threshold.

[0113] ​According to the comparison results of the fluctuation amplitude and the fluctuation intensity with the preset charge and discharge threshold ranges respectively, switch and control the charge and discharge process of the energy storage device to the elevator frequency converter bus, including:

[0114] When it is judged that the voltage peak difference is greater than the first charging threshold and the root mean square value of the voltage is greater than the second charging threshold, control the host device to receive the electric energy of the elevator frequency converter bus and send a received electric energy signal to the slave device, so that the slave device receives the electric energy of the elevator frequency converter bus.

[0115] When it is judged that the voltage peak difference is less than the first discharge threshold and the root mean square value of the voltage is less than the second discharge threshold, control the host device to release electric energy to the elevator frequency converter bus and send a released electric energy signal to the slave device, so that the slave device releases electric energy to the elevator frequency converter bus.

[0116] Among them, the voltage peak difference and the root mean square value of the voltage will not trigger the charge and discharge mode switching between their respective charging thresholds and discharge thresholds. When it is judged that the voltage peak difference is greater than the first charging threshold and the root mean square value of the voltage is greater than the second charging threshold, it indicates that the elevator is running in the power generation mode at this time, and there is too much energy in the elevator frequency converter bus, and it is necessary to charge the energy storage device. Then the host device controls the slave device to synchronously receive the electric energy of the elevator frequency converter. When it is judged that the voltage peak difference is less than the first discharge threshold and the root mean square value of the voltage is less than the second discharge threshold, it indicates that the elevator is running in the power consumption mode at this time, and the elevator energy storage system should switch to the discharge mode. Then the host device controls the slave device to synchronously discharge to the elevator frequency converter bus to provide additional energy support.

[0117] Exemplarily, when it is judged that the fluctuation amplitude (peak difference) of the bus voltage signal is greater than the set first charging threshold (such as 30V), and when it is judged that the fluctuation intensity (root mean square value) of the bus voltage signal is greater than the set second charging threshold (such as 600V), start the charging mode. When it is judged that the fluctuation amplitude (peak difference) of the bus voltage signal is less than the set first discharge threshold (such as 15V), and when it is judged that the fluctuation intensity (root mean square value) of the bus voltage signal is less than the set second discharge threshold (such as 505V), start the discharge mode.

[0118] It should be noted that the above-mentioned each module can be a functional module or a program module, and can be implemented either by software or by hardware. For the modules implemented by hardware, the above-mentioned each module can be located in the same processor; or the above-mentioned each module can also be located in different processors in any combination form.

[0119] It should be noted that the specific examples in this embodiment can refer to the examples described in the above-mentioned embodiments and optional implementation manners, and will not be elaborated in this embodiment.

[0120] In addition, in combination with the elevator energy consumption management method provided in the above embodiments, a storage medium can also be provided in this embodiment to implement it. A computer program is stored on the storage medium; when the computer program is executed by a processor, any one of the elevator energy consumption management methods in the above embodiments is implemented.

[0121] It should be understood that the specific embodiments described here are only used to explain this application, rather than to limit it. According to the embodiments provided in this application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of this application.

[0122] Obviously, the accompanying drawings are only some examples or embodiments of this application. For those of ordinary skill in the art, this application can also be applied to other similar situations based on these drawings without creative work. In addition, it can be understood that although the work done during the development process here may be complex and time-consuming, for those of ordinary skill in the art, certain design, manufacturing, or production changes based on the technical content disclosed in this application are only conventional technical means and should not be regarded as insufficient disclosure of this application.

[0123] The term "embodiment" in this application means that the specific features, structures, or characteristics described in combination with the embodiments can be included in at least one embodiment of this application. The phrase appears in various positions in the specification does not necessarily mean the same embodiment, nor does it mean being independent or alternative to other embodiments and mutually exclusive. Those of ordinary skill in the art can clearly or implicitly understand that the embodiments described in this application can be combined with other embodiments without conflict.

[0124] The above-described embodiments only represent several implementation manners of this application, and their descriptions are relatively specific and detailed, but should not be construed as limiting the scope of patent protection. It should be noted that for those of ordinary skill in the art, without departing from the concept of this application, several modifications and improvements can still be made, and these all belong to the protection scope of this application. Therefore, the protection scope of this application should be subject to the appended claims.

Claims

1. An elevator energy consumption management method, characterized in that: The method is applied to a host device of an elevator energy storage system, wherein the elevator energy storage system comprises an energy storage device and an elevator frequency converter, wherein the energy storage device is connected to the elevator frequency converter; The energy storage device includes a host device and at least one slave device; The host device and the slave device are in communication connection and configured in a load-side parallel mode; the method comprises: Acquire a first load end current of the host device, a second load end current of the slave device, and acquire a bus voltage value of the elevator inverter; Based on the current difference between the first load end current and the second load end current, a current regulation signal is sent to the slave device to synchronize the first load end current of the host device and the second load end current of the slave device, and / or based on the bus voltage value, a voltage regulation signal is sent to the slave device to synchronize the load end voltage of the host device with that of the slave device.

2. The elevator energy consumption management method according to claim 1, characterized in that: The step of obtaining the first load end current of the host device and the second load end current of the slave device includes: In response to a start signal of the elevator energy storage system, an identification request is sent to an initial slave device in the energy storage device through any device in the energy storage device; any device in the energy storage device is an initial host device, and the initial slave device includes other devices in the energy storage device except the initial host device; When the initial slave device responds to the identification request, obtaining an identifier of the initial slave device; A host device and at least one slave device in the energy storage device are determined according to the identifier; the slave device includes other devices in the energy storage device except the host device.

3. The elevator energy consumption management method according to claim 2, characterized in that: The sending a current regulation signal to the slave device based on the current difference between the first load terminal current and the second load terminal current includes: determining whether a current difference between the first load end current and the second load end current exceeds a preset current threshold; When the current difference exceeds a preset current threshold, the first load end current is adjusted through PID control and the current adjustment signal is generated and sent to the slave device, so that the slave device adjusts the second load end current of the slave device according to the current adjustment signal until the difference between the first load end current and the second load end current does not exceed the preset current threshold.

4. The elevator energy consumption management method according to claim 3, characterized in that: The step of sending a voltage regulation signal to the slave device based on the bus voltage value to synchronize the load terminal voltages of the host device and the slave device comprises: The first load terminal voltage of the host device is adjusted based on the bus voltage value and the voltage adjustment signal is generated and sent to the slave device, so that the slave device adjusts the second load terminal voltage of the slave device according to the voltage adjustment signal until the first load terminal voltage of the host device and the second load terminal voltage of the slave device are consistent with the bus voltage value.

5. The elevator energy consumption management method according to any one of claim 3 or claim 4, characterized in that: Before sending a current regulating signal to the slave device and / or sending a voltage regulating signal to the slave device, the method includes: Sending a synchronization signal to the slave device according to a preset time interval, wherein the synchronization signal carries a timestamp, so that the slave device checks whether the time of the slave device is consistent with the timestamp; When it is determined based on feedback from the slave device that the time of the slave device is consistent with the timestamp, the current regulation signal and / or the voltage regulation signal is sent to the slave device; or when it is determined that the time of the slave device is inconsistent with the timestamp, the synchronization signal is resent to the slave device according to the time interval.

6. The elevator energy consumption management method according to claim 5, characterized in that: The method further comprises: Based on the bus voltage value of the elevator inverter, determining the bus voltage signal fluctuation amplitude and fluctuation intensity of the elevator inverter; According to the comparison results of the fluctuation amplitude and the fluctuation intensity with the preset charging and discharging threshold range, the charging and discharging process of the energy storage device to the elevator inverter bus is switched and controlled.

7. The elevator energy consumption management method according to claim 6, characterized in that: The determining, based on the bus voltage value of the elevator inverter, the bus voltage signal fluctuation amplitude and fluctuation intensity of the elevator inverter comprises: Obtain bus voltage values ​​of a plurality of elevator frequency converters within a preset period; Determine a voltage peak value difference between a voltage peak value and a voltage valley value among the plurality of bus voltage values, and determine a fluctuation amplitude of the bus voltage signal fluctuation according to the voltage peak value difference; The voltage root mean square values ​​of the plurality of bus voltage values ​​are determined, and the fluctuation intensity of the bus voltage signal fluctuation is determined according to the voltage root mean square values.

8. The elevator energy consumption management method according to claim 7, characterized in that: The charge and discharge thresholds include a first charge threshold, a second charge threshold, a first discharge threshold, and a second discharge threshold; the first charge threshold is greater than the first discharge threshold; the second charge threshold is greater than the second discharge threshold; The process of switching and controlling the charging and discharging of the energy storage device to the elevator inverter busbar according to the comparison results of the fluctuation amplitude and the fluctuation intensity with the preset charging and discharging threshold ranges respectively includes: When it is determined that the voltage peak difference is greater than the first charging threshold and the voltage root mean square value is greater than the second charging threshold, receiving the electric energy of the elevator inverter bus and sending a receiving electric energy signal to the slave device so that the slave device receives the electric energy of the elevator inverter bus; When it is determined that the voltage peak difference is less than the first discharge threshold and the voltage root mean square value is less than the second discharge threshold, electric energy is released to the elevator inverter bus, and a power release signal is sent to the slave device so that the slave device releases electric energy to the elevator inverter bus.

9. An elevator energy storage system, characterized in that: The system comprises: an energy storage device and an elevator frequency converter; the energy storage device is connected to the elevator frequency converter; the energy storage device is used to release energy to the elevator frequency converter and also to absorb energy transmitted by the elevator frequency converter; The energy storage device comprises a host device, and the host device is used to execute the elevator energy consumption management method according to any one of claims 1 to 8; The energy storage device further includes at least one slave device, and the host device is communicatively connected to the at least one slave device respectively; the slave device is used to execute the current regulation signal and / or voltage regulation signal of the host device.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the elevator energy consumption management method according to any one of claims 1 to 8 are implemented.

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