Elevator power supply system based on generator set and power battery

Abstract

The invention relates to the technical field of elevator power supply, and discloses an elevator power supply system based on a generator set and a power battery, which comprises the generator set, the power battery, a power grid, a power failure cabinet, a power supply conversion module, a main control board and an elevator driving device, the power supply conversion module is connected with the power battery, the power grid, the power failure cabinet, the main control board and the elevator driving device, the power battery is further connected with the generator set, and the main control board is further connected with the elevator driving device; the power supply conversion module communicates with the main control board and selects a power grid, a power battery or a power failure cabinet to supply power according to the current elevator state, and the current elevator state comprises the electricity price state, the power grid state and the power battery state. According to the invention, the problem that a traditional UPS system can only provide short-time power supply when a power grid is powered off is solved. Through cooperative use of the generator set and the power battery, normal operation of the elevator can be guaranteed under the condition of long-time power failure or frequent power failure.

Description

Technical Field

[0001] The present invention relates to the technical field of elevator power supply, and in particular to an elevator power supply system based on a generator set and a power battery. Background Art

[0002] In modern buildings, elevators have become an indispensable means of vertical transportation. With the advancement of technology, the application of electricity has been widely used in the drive and control systems of elevators. However, the stability of power supply is an important challenge, especially in the case of power outages or insufficient power supply, how to ensure the safety and normal operation of elevators has become an important issue. In addition, with the improvement of environmental awareness, how to effectively use and store energy and reduce energy waste has also become an important topic.

[0003] Solutions of existing technologies: In existing technologies, an uninterruptible power supply (UPS) system is usually used to ensure the normal operation of the elevator when the power grid is out of power. An uninterruptible power supply is a device that can provide continuous and stable power to the load equipment when the mains is interrupted or an abnormal situation occurs. It is mainly composed of a rectifier, an inverter, a battery, and a static switch. The battery provides power when the power grid is out of power, and the inverter converts the battery's direct current into alternating current for the elevator. In addition, some advanced elevator systems are also equipped with an energy feedback system that can convert the kinetic energy of the elevator during braking into electrical energy and store it in the battery to achieve energy reuse.

[0004] However, the existing technology still has some problems and limitations in practical application. First, the traditional UPS system usually has a small capacity and can only provide short-term power supply. Its effect is limited for long-term power outages or frequent power outages. Secondly, the existing energy feedback system also has certain limitations in energy conversion efficiency and cannot fully utilize the energy generated during elevator braking. Therefore, how to develop a new technology and system that can provide long-term and stable power supply when the power grid is out of power, while being able to efficiently utilize and store energy and reduce energy waste has become an urgent problem to be solved in this field. Summary of the invention

[0005] The present invention provides an elevator power supply system based on a generator set and a power battery. Compared with the prior art, it mainly solves the following technical problems:

[0006] 1) It solves the problem that the traditional UPS system can only provide short-term power supply when the power grid is out of power. Through the coordinated use of generator sets and power batteries, it can ensure the normal operation of the elevator in the case of long-term or frequent power outages.

[0007] 2) Reduce electricity costs. Through the present invention, the battery management system (BMS) obtains the power supply status information of the power grid and the power battery. The power battery can be charged by the power grid when the power price is low. At this time, the power grid can directly supply power to the elevator. When the power price is high, the power battery directly supplies power to the elevator. The power battery is reasonably charged and discharged through the battery management system (BMS), which can save electricity costs to the maximum extent and reduce the burden on the power grid.

[0008] 3) The problem that the existing energy feedback system has low energy conversion efficiency and cannot fully utilize the energy generated during elevator braking is solved. Through the present invention, the power battery can store the energy generated during elevator braking, realize energy reuse, and improve energy utilization efficiency.

[0009] 4) The invention solves the problem of how to ensure the safety and normal operation of the elevator in the case of unstable power supply or power outage. Through the invention, the combined use of the generator set and the power battery can provide a long-term and stable power supply in the case of unstable power supply or power outage, ensuring the safety and normal operation of the elevator.

[0010] The present invention provides an elevator power supply system based on a generator set and a power battery, comprising a generator set, a power battery, a power grid, a power outage cabinet, a power supply conversion module, a main control board and an elevator drive device, wherein the power supply conversion module is respectively connected to the power battery, the power grid, the power outage cabinet, the main control board and the elevator drive device, the power battery is also connected to the generator set, and the main control board is also connected to the elevator drive device;

[0011] The power supply conversion module communicates with the main control board and selects the power grid, power battery or power outage cabinet for power supply according to the current elevator status, wherein the current elevator status includes the electricity price status, the power grid status and the power battery status.

[0012] Furthermore, the power battery includes a battery management system BMS, and the battery management system BMS is used to communicate with a main control board.

[0013] Furthermore, the selecting of a power grid, a power battery or a power failure cabinet for power supply according to the current elevator state specifically includes:

[0014] When the electricity price is high or the power grid is abnormal, the battery management system BMS communicates with the main control board to control the power conversion module to supply power to the elevator through the power battery;

[0015] When the electricity price is low and there is no abnormality in the power grid, the power conversion module selects the power grid to supply power to the elevator and charge the power battery;

[0016] When the power battery is exhausted and the generator set can no longer generate electricity, the power supply conversion module switches to the power outage cabinet for emergency power supply.

[0017] Furthermore, when the power battery is used for power supply, the power battery is directly connected to the bus terminal of the elevator inverter for power supply.

[0018] Further, the time period with a high electricity price range is a time period with a peak electricity price, specifically including 10:00-14:00 and 18:00-22:00 on weekdays;

[0019] The time periods in the low electricity price range are the time periods of valley electricity prices and the time periods of flat electricity prices, wherein the time periods of valley electricity prices are from 23:00 to 6:00 the next day, and the time periods of flat electricity prices are from 6:00 to 10:00, 14:00 to 18:00, and 22:00 to 23:00 on weekdays, and from 6:00 to 23:00 on weekends.

[0020] Furthermore, when the power grid supplies power to the elevator and charges the power battery, the power battery supplies power to the elevator during a period of high electricity prices, and the power grid charges the power battery during a period of low electricity prices.

[0021] Furthermore, it also includes an energy feedback device, which is respectively connected to the power battery and the elevator drive device, and uses the power battery to store energy during the process of the elevator going up, down or decelerating, so as to reuse the energy through the energy feedback device.

[0022] Furthermore, when the elevator goes up and the load does not exceed the first set value, when the elevator goes down and the load exceeds the second set value, and when the elevator decelerates, the elevator drive device generates electrical energy and stores it in the power battery.

[0023] Furthermore, the energy storage process of the energy feedback device is:

[0024] Rectification: The elevator drive device rectifies the alternating current (AC) generated by the motor and converts it into direct current (DC);

[0025] Filtering: Remove fluctuations and noise from the electric energy to ensure the quality of the electric energy, and then store the electric energy in the power battery.

[0026] Furthermore, the elevator drive device includes a power module, a drive module and an elevator host, the power module, the drive module and the elevator host are all connected to the main control board, the drive module is also connected to the power module and the elevator host respectively, the power module is also connected to the power supply conversion module, and the elevator host is also connected to the energy feedback device.

[0027] The beneficial effects of the present invention are:

[0028] 1. Long-term stable power supply: The present invention adopts a combination of a generator set and a power battery. When the power grid is out of power, the power battery can provide long-term power supply, and the generator set can charge the battery when the power battery is almost exhausted, thereby ensuring the normal operation of the elevator in the case of a long power outage. Compared with the traditional UPS system, the power supply time of the present invention is longer and the reliability is higher.

[0029] 2. Efficient energy utilization: The battery in the present invention can not only supply power when the power grid is out of power, but also store the electric energy converted from kinetic energy when the elevator is descending or decelerating, thereby realizing energy reuse. The recovered energy does not need to be converted through DC / AC inversion, but can be directly supplied to the elevator inverter bus, thereby reducing energy loss. At the same time, the battery management system of the power battery can monitor the power supply status information of the power grid, store the power of the power grid during low-peak periods, and release the power to the elevator during peak periods, thereby realizing efficient energy utilization and reducing energy waste. Compared with the existing energy feedback system, the energy conversion efficiency of the present invention is higher, and it can make more full use of the energy generated when the elevator is descending or decelerating.

[0030] 3. Reduce costs: Since this solution has a higher power supply time and reliability, it can reduce elevator failures and maintenance costs caused by insufficient power supply, thereby reducing the overall operating cost of the elevator system.

[0031] 4. Environmental protection and energy saving: The present invention reduces energy waste by efficiently utilizing and storing energy, which is beneficial to environmental protection and energy saving and emission reduction. Compared with the existing technology, the present invention has significant advantages in reducing energy waste and environmental pollution.

[0032] In summary, compared with the prior art, the present invention can provide long-term and stable power supply when the power grid is outage, and at the same time can efficiently utilize and store energy, reduce energy waste, and reduce costs. It has significant advantages and practical value. BRIEF DESCRIPTION OF THE DRAWINGS

[0033] Figure 1 It is a structural schematic diagram of the elevator power supply system based on a generator set and a power battery of the present invention.

[0034] In the accompanying drawings, there are a generator set 1, a power battery 2, a power grid 3, a power outage cabinet 4, a power supply conversion module 5, a power module 6, a drive module 7, an elevator host 8, a main control board 9, and an energy feedback device 10.

[0035] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0036] The technical solutions in the embodiments of the present invention will be described clearly and completely below in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0037] It should be noted that all directional indications in the embodiments of the present invention (such as up, down, left, right, front, back, etc.) are only used to explain the relative position relationship, movement status, etc. between the components under a certain specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indication will also change accordingly.

[0038] In addition, the descriptions of "first", "second", etc. in the present invention are only used for descriptive purposes and cannot be understood as indicating or implying their relative importance or implicitly indicating the number of the indicated technical features. Therefore, the features defined as "first" and "second" may explicitly or implicitly include at least one of the features. In addition, the technical solutions between the various embodiments can be combined with each other, but they must be based on the ability of ordinary technicians in the field to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be deemed that such a combination of technical solutions does not exist and is not within the scope of protection required by the present invention.

[0039] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0040] The present invention provides an elevator power supply system based on a generator set and a power battery. First, it solves the problem that the traditional UPS system can only provide short-term power supply when the power grid 3 is out of power. Second, it solves the problem that the existing energy feedback system has low energy conversion efficiency and cannot fully utilize the energy generated during elevator braking. Third, it solves the problem of how to ensure the safety and normal operation of the elevator in the case of unstable power supply or power outage of the power grid 3.

[0041] Generator sets are complete sets of mechanical equipment that convert other forms of energy into electrical energy. It consists of a power system, a control system, a silencer system, a shock absorption system, and an exhaust system. It is usually driven by a turbine, a steam turbine, a diesel engine, or other power machinery. These power machines convert the energy generated by water flow, air flow, fuel combustion, or nuclear fission into mechanical energy and transmit it to the generator, which then converts it into electrical energy and outputs it to electrical equipment for use. Generator sets play an important role in the power supply system, especially during peak periods of power demand, when power supply is insufficient or interrupted, and in emergencies such as natural disasters. Generator sets can provide backup power to ensure the normal production and life. Depending on the power source, generator sets can be divided into diesel generator sets, gasoline generator sets, gas generator sets, solar generator sets, and other types.

[0042] A power battery is a device that can store and recharge electrical energy. It mainly provides power sources for electric vehicles, electric trains, electric bicycles and other vehicles. The core function of a power battery is to provide the required electrical energy for various electric vehicles to support their normal operation. It is the core component of new energy vehicles and has a direct impact on the range, safety and overall user experience of new energy vehicles. There are many types of power batteries, among which the most common and mainstream is lithium-ion batteries. In addition, there are lead-acid batteries, nickel-hydrogen power batteries, sodium-sulfur batteries, zinc-air batteries, lithium polymer batteries, lithium-sulfur batteries, solid-state batteries, and special batteries developed by different manufacturers. These batteries have their own advantages and disadvantages in terms of performance, cost, safety, energy density, etc., and are suitable for different application scenarios. Power batteries usually have the characteristics of ultra-long life, safe use, large current fast charging and discharging, high temperature resistance, large capacity, no memory effect, small size, and light weight. These characteristics make power batteries have broad application prospects in the field of electric vehicles.

[0043] The battery management system (BMS) is an important link between battery cells, electronic devices and energy systems. It is responsible for monitoring, controlling, protecting and balancing battery packs to ensure that the battery operates in a safe, reliable and efficient state. For many scenarios that rely on battery power, such as new energy vehicles, energy storage power stations, and portable electronic devices, BMS is like the "brain" of the battery, accurately controlling the "health status" and "energy output" of the battery. The battery management system has monitoring functions, control functions, and protection functions. Among them, the monitoring function includes voltage monitoring, current monitoring, and temperature monitoring; the control function includes charge and discharge control and balancing control; the protection function includes overcharge protection, over-discharge protection, overcurrent protection, and short-circuit protection. The hardware architecture of the battery management system includes a sensor module, a control unit, a communication interface, and an actuator; among them, the sensor module includes a voltage sensor, a current sensor, and a temperature sensor; the control unit is composed of a microcontroller (MCU, Micro-Controller Unit) or a digital signal processor (DSP, Digital Signal Processor); the communication interface is used for data exchange between BMS and other electronic devices or energy management systems; the actuator includes relays, electronic switches, balancing circuits, etc.

[0044] The present invention can ensure the normal operation of the elevator in the case of long-term or frequent power outages through the coordinated use of the generator set 1 and the power battery 2. The battery management system (BMS) obtains the power supply status information of the power grid 3 and the power battery 2. The power battery 2 can be charged by the power grid 3 when the power price of the power grid 3 is low. At this time, the power grid 3 can directly supply power to the elevator. When the power price is high, the power battery 2 directly supplies power to the elevator; the power battery 2 is reasonably charged and discharged by the battery management system (BMS) to save electricity costs to the maximum extent and reduce the burden on the power grid 3. The power battery 2 can store the energy during elevator braking, realize energy reuse, and improve energy utilization efficiency. The coordinated use of the generator set 1 and the power battery 2 can provide a long-term and stable power supply in the case of unstable power supply or power outage of the power grid 3, ensuring the safety and normal operation of the elevator.

[0045] like Figure 1As shown, the elevator power supply system based on a generator set and a power battery provided by the present invention includes a generator set 1, a power battery 2, a power grid 3, a power outage cabinet 4, a power conversion module 5, a main control board 9 and an elevator drive device, wherein the power conversion module 5 is respectively connected to the power battery 2, the power grid 3, the power outage cabinet 4, the main control board 9 and the elevator drive device, the power battery 2 is also connected to the generator set 1, and the main control board 9 is also connected to the elevator drive device; in one embodiment, the elevator drive device includes a power module 6, a drive module 7 and an elevator host 8, the power module 6, the drive module 7 and the elevator host 8 are all connected to the main control board 9, the drive module 7 is also respectively connected to the power module 6 and the elevator host 8, the power module 6 is also connected to the power conversion module 5, and the elevator host 8 is also connected to the energy feedback device 10. In one embodiment, the power battery 2 includes a battery management system BMS, and the battery management system BMS is used to communicate with the main control board 9.

[0046] The power supply conversion module 5 communicates with the main control board 9 and selects the power grid 3, the power battery 2 or the power outage cabinet 4 for power supply according to the current elevator state, wherein the current elevator state includes the electricity price state, the power grid 3 state and the power battery 2 state.

[0047] In one embodiment, the selecting of the power grid 3, the power battery 2 or the power failure cabinet 4 for power supply according to the current elevator state specifically includes:

[0048] 1) When the electricity price is high or the power grid 3 is abnormal, the battery management system BMS communicates with the main control board 9 to control the power conversion module 5 to supply power to the elevator through the power battery 2. In one embodiment, when the power battery 2 is used for power supply, the power battery 2 is directly connected to the bus terminal of the elevator inverter for power supply.

[0049] 2) When the electricity price is low and the power grid 3 is normal, the power conversion module 5 selects the power grid 3 to supply power to the elevator and charge the power battery 2;

[0050] 3) When the power battery 2 is exhausted and the generator set 1 is unable to generate electricity, the power supply conversion module 5 switches to the power outage cabinet 4 for emergency power supply.

[0051] In one embodiment, electricity prices are generally divided into:

[0052] Peak electricity price (peak electricity consumption period: 10:00-14:00 and 18:00-22:00 on weekdays).

[0053] Valley electricity price (low peak electricity consumption period: 23:00 every day to 6:00 the next day).

[0054] Flat-rate electricity price (the rest of the time, i.e. 6:00-10:00, 14:00-18:00, 22:00-23:00 on weekdays, 6:00-23:00 on weekends).

[0055] Taking Shanghai's electricity price policy as an example, the electricity price for general industrial and commercial electricity during the peak hours of summer (July, August, and September) and winter (January and December) is 20% higher than the normal price, and the electricity price during the off-peak hours is 45% lower than the normal price. During the peak hours of other months, the electricity price is 17% higher than the normal price, and the electricity price during the off-peak hours is 45% higher than the normal price.

[0056] The present invention sets the time period of the high electricity price range as the time period of peak electricity price, specifically including 10:00-14:00 and 18:00-22:00 on weekdays; the time period of the low electricity price range is the time period of valley electricity price and the time period of flat electricity price, wherein the time period of valley electricity price is 23:00-6:00 the next day, and the time period of flat electricity price is 6:00-10:00, 14:00-18:00, 22:00-23:00 on weekdays, and 6:00-23:00 on weekends.

[0057] In one embodiment, when the power grid 3 supplies power to the elevator and charges the power battery 2, the power battery 2 supplies power to the elevator during a period of high electricity prices, and the power grid 3 charges the power battery 2 during a period of low electricity prices.

[0058] In one embodiment, the present invention also includes an energy feedback device 10, which is respectively connected to the power battery 2 and the elevator drive device, and uses the power battery 2 to store energy during the elevator's upward, downward or deceleration process, so as to reuse energy through the energy feedback device 10.

[0059] The elevator energy feedback device 10 is an energy-saving device used in an elevator system. During the operation of the elevator, when the elevator moves upward (the elevator lifting system needs to overcome gravity and load, but when the load is light, the motor may generate excess electrical energy), or when the elevator moves downward (especially when fully loaded), the motor will actually be in a power generation state and generate electrical energy. If this electrical energy is not used, it will usually be wasted in the form of heat energy. In general, the function of the energy feedback device 10 is to efficiently convert this part of the electrical energy into usable electrical energy and feed it back to the power grid 3 for use by other equipment, thereby achieving the effect of saving energy.

[0060] Storing the energy fed back by the elevator is another way to improve the energy efficiency of the elevator system. Compared with directly feeding the electric energy back to the grid 3, the energy storage method can store the electric energy when the grid 3 conditions are not suitable for immediate feedback or when there is no suitable load to use the electric energy, and then use it when needed. This method is particularly suitable for those scenarios where the quality of the grid 3 is unstable or direct access to the grid 3 is not possible.

[0061] Therefore, in one embodiment, energy storage is performed during the process of the elevator going up, down or decelerating, specifically including: when the elevator goes up and the load does not exceed the first set value (that is, when the elevator is lightly loaded, the first set value can be set according to the specific situation and is not limited here), the elevator goes down and the load exceeds the second set value (that is, when the elevator is fully loaded, the second set value can be set according to the specific situation and is not limited here), and the elevator decelerates, the elevator drive device generates electrical energy and stores it in the power battery 2.

[0062] In one embodiment, the energy storage process of the energy feedback device 10 is:

[0063] 1) Rectification: The elevator drive device rectifies the alternating current (AC) generated by the motor and converts it into direct current (DC) for storage.

[0064] 2) Filtering: Remove fluctuations and noise in electrical energy to ensure power quality.

[0065] After the above two steps, the fed-back energy can be stored in the battery.

[0066] In general, without the power battery 2 for energy storage, the energy of energy feedback needs to be converted from direct current (DC) to alternating current (AC) to be fed back to the power grid 3 or to supply electricity to other devices. However, the energy recovered by the energy feedback device 10 of the present invention can be directly supplied to the elevator inverter bus without DC / AC inversion, which can eliminate the energy loss caused by DC / AC inversion.

[0067] The specific working process of the present invention is as follows: a power supply conversion module 5 is used, which can communicate with the main control board 9, and selects the power grid 3, the power battery 2 or the power outage cabinet 4 for power supply according to the current state of the elevator. Specifically, when the electricity price is high or the power grid 3 is abnormal, the BMS communicates with the main control board 9 to control the power supply conversion module 5 to supply power to the elevator through the power battery 2; when the electricity price is low and there is no abnormality in the power grid 3, the power supply conversion module 5 selects the power grid 3 to supply power to the elevator and charges the power battery 2; when the power battery 2 is exhausted and the generator set 1 can no longer generate electricity, the power supply conversion module 5 immediately switches to the power outage cabinet 4 for emergency power supply.

[0068] By using the generator set 1 and the power battery 2 together, when the power grid 3 is out of power, the power battery 2 can provide a long-term power supply, and the generator set 1 can charge the power battery 2 when the power battery 2 is almost exhausted, thereby ensuring the normal operation of the elevator in the case of a long power outage. The power electricity is charged by the power grid 3 when the electricity price is low, and the elevator is powered when the electricity price is high. This charging method can make full use of the power resources of the power grid 3 and improve energy utilization efficiency. The power battery 2 is used to store the energy during the elevator's descent or deceleration process, and the energy is reused through the energy feedback device 10. When the elevator is descending or decelerating, the energy generated can be stored in the power battery 2, and then released when needed for the operation of the elevator, thereby improving energy utilization efficiency. When the power battery 2 is used for power supply, the power battery 2 is directly connected to the bus terminal of the elevator inverter for power supply, avoiding the part of the AC rectification, reducing the power loss during the rectification process, and improving energy utilization efficiency. The following technical effects are achieved:

[0069] 1. Long-term stable power supply: The present invention adopts a combination of a generator set 1 and a power battery 2. When the power grid 3 is out of power, the power battery 2 can provide long-term power supply, and the generator set 1 can charge the battery when the power battery 2 is almost exhausted, thereby ensuring the normal operation of the elevator in the case of a long power outage. Compared with the traditional UPS system, this solution has a longer power supply time and higher reliability.

[0070] 2. Efficient energy utilization: The battery in the present invention can not only supply power when the power grid 3 is out of power, but also store the electric energy converted from kinetic energy when the elevator is descending or decelerating, thereby realizing energy reuse. The recovered energy does not need to be converted through DC / AC inversion, but can be directly supplied to the elevator inverter bus, thereby reducing energy loss. At the same time, the battery management system of the power battery 2 can monitor the power supply status information of the power grid 3, store the power of the power grid 3 during low-peak periods, and release the power to the elevator during peak periods, thereby realizing efficient energy utilization and reducing energy waste. Compared with the existing energy feedback system, this solution has a higher energy conversion efficiency and can make more full use of the energy generated when the elevator is descending or decelerating.

[0071] 3. Reduce costs: Since this solution has a higher power supply time and reliability, it can reduce elevator failures and maintenance costs caused by insufficient power supply, thereby reducing the overall operating cost of the elevator system.

[0072] 4. Environmental protection and energy saving: The present invention reduces energy waste by efficiently utilizing and storing energy, which is beneficial to environmental protection and energy saving and emission reduction. Compared with existing technologies, this solution has significant advantages in reducing energy waste and environmental pollution.

[0073] In summary, compared with the prior art, the present invention can provide long-term and stable power supply when the power grid 3 is out of power, and at the same time can efficiently utilize and store energy, reduce energy waste, and reduce costs, and has significant advantages and practical value.

[0074] Application prospects: Due to the advanced nature of the present invention, it can be widely used in application fields such as power engineering, elevator engineering and energy storage systems. In the field of power engineering, the present invention uses the generator set 1 and the power battery 2 to power the elevator, which can ensure the normal operation of the elevator when the power grid 3 is out of power, thereby improving the stability of power supply. At the same time, the power battery 2 is charged during the period of low electricity prices, and the elevator is powered by the power battery 2 during the period of high electricity prices, thereby realizing the reasonable allocation and utilization of energy and reducing electricity costs. In the field of elevator engineering, the present invention stores the energy during elevator braking through the power battery 2, thereby realizing energy reuse and reducing energy waste. At the same time, through the coordinated use of the generator set 1 and the power battery 2, a long-term and stable power supply can be provided, thereby improving the safety and reliability of the elevator. In the field of energy storage systems, the present invention realizes energy storage and release through the charging and discharging of the power battery 2, thereby improving energy utilization efficiency. In general, the present invention has broad application prospects in the fields of power engineering, elevator engineering and energy storage systems, with large market demand, good commercial value and social benefits.

[0075] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, device, article or method including a series of elements includes not only those elements, but also includes other elements not explicitly listed, or also includes elements inherent to such process, device, article or method. In the absence of further restrictions, an element defined by the sentence "includes a ..." does not exclude the presence of other identical elements in the process, device, article or method including the element.

[0076] The above description is only a preferred embodiment of the present invention, and does not limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made by using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An elevator power supply system based on a generator set and a power battery, characterized in that: It includes a generator set, a power battery, a power grid, a power outage cabinet, a power supply conversion module, a main control board and an elevator drive device, wherein the power supply conversion module is respectively connected to the power battery, the power grid, the power outage cabinet, the main control board and the elevator drive device, the power battery is also connected to the generator set, and the main control board is also connected to the elevator drive device; The power supply conversion module communicates with the main control board and selects the power grid, power battery or power outage cabinet for power supply according to the current elevator status, wherein the current elevator status includes the electricity price status, the power grid status and the power battery status.

2. The elevator power supply system based on a generator set and a power battery according to claim 1, characterized in that: The power battery includes a battery management system BMS, and the battery management system BMS is used to communicate with the main control board.

3. The elevator power supply system based on a generator set and a power battery according to claim 2, characterized in that: The selecting of the power grid, power battery or power failure cabinet for power supply according to the current elevator state specifically includes: When the electricity price is high or the power grid is abnormal, the battery management system BMS communicates with the main control board to control the power conversion module to supply power to the elevator through the power battery; When the electricity price is low and there is no abnormality in the power grid, the power conversion module selects the power grid to supply power to the elevator and charge the power battery; When the power battery is exhausted and the generator set can no longer generate electricity, the power supply conversion module switches to the power outage cabinet for emergency power supply.

4. The elevator power supply system based on a generator set and a power battery according to claim 3 is characterized in that: When the power battery is used for power supply, the power battery is directly connected to the bus terminal of the elevator inverter for power supply.

5. The elevator power supply system based on a generator set and a power battery according to claim 3, characterized in that: The high electricity price range is the peak electricity price period, specifically including 10:00-14:00 and 18:00-22:00 on weekdays; The time periods in the low electricity price range are the time periods of valley electricity prices and the time periods of flat electricity prices, wherein the time periods of valley electricity prices are from 23:00 to 6:00 the next day, and the time periods of flat electricity prices are from 6:00 to 10:00, 14:00 to 18:00, and 22:00 to 23:00 on weekdays, and from 6:00 to 23:00 on weekends.

6. The elevator power supply system based on a generator set and a power battery according to claim 5, characterized in that: When the power grid supplies power to the elevator and charges the power battery, the power battery supplies power to the elevator during a period of high electricity prices, and the power grid charges the power battery during a period of low electricity prices.

7. The elevator power supply system based on a generator set and a power battery according to claim 1, characterized in that: It also includes an energy feedback device, which is respectively connected to the power battery and the elevator drive device, and uses the power battery to store energy during the process of the elevator going up, down or decelerating, so as to reuse the energy through the energy feedback device.

8. The elevator power supply system based on a generator set and a power battery according to claim 7, characterized in that: When the elevator goes up and the load does not exceed the first set value, when the elevator goes down and the load exceeds the second set value, and when the elevator decelerates, the elevator drive device generates electric energy and stores it in the power battery.

9. The elevator power supply system based on a generator set and a power battery according to claim 8, characterized in that: The energy storage process of the energy feedback device is as follows: Rectification: The elevator drive device rectifies the alternating current (AC) generated by the motor and converts it into direct current (DC); Filtering: Remove fluctuations and noise from the electric energy to ensure the quality of the electric energy, and then store the electric energy in the power battery.

10. The elevator power supply system based on a generator set and a power battery according to claim 7, characterized in that: The elevator driving device includes a power module, a drive module and an elevator host. The power module, the drive module and the elevator host are all connected to the main control board. The drive module is also connected to the power module and the elevator host respectively. The power module is also connected to the power supply conversion module. The elevator host is also connected to the energy feedback device.

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