Optical storage and direct-broadcasting flexible communication base station power supply system

Abstract

This application discloses a photovoltaic-storage-DC-flexible communication base station power supply system, relating to the field of communication power supply technology. In this system, an AC / DC flexible bidirectional converter module supplies power to the DC 375V bus in rectification mode; in inverter mode, it feeds the DC power from the DC 375V bus into the AC power supply; a photovoltaic DC / DC converter module feeds photovoltaic power into the DC 375V bus; and an energy storage bidirectional DC / DC converter module performs charge and discharge control based on the voltage state of the DC 375V bus. The AC / DC flexible bidirectional converter module, the photovoltaic DC / DC converter module, and the energy storage bidirectional DC / DC converter module achieve hierarchical stable control of the DC 375V bus voltage through coordinated control. This application solves the problems of low multi-stage conversion efficiency, complex coordinated control, low energy utilization, and inability to interact bidirectionally with the power grid caused by the patchwork architecture of existing base station power supply systems.

Description

Technical Field

[0001] This application relates to the field of communication power supply technology, and in particular to a power supply system for a photovoltaic-storage-direct-flexible communication base station. Background Technology

[0002] With the rapid development of 5G communication technology and the continuous expansion of communication network scale, the communication industry faces enormous pressure to conserve energy and reduce carbon emissions. Most existing base station "optical-storage" solutions are based on simple additions to traditional communication base station power supply systems, essentially remaining a patchwork architecture of "AC as the primary and DC as the secondary," exhibiting the following main drawbacks: 1) Photovoltaics and energy storage require multiple conversion stages before they can be connected to the system. The coordinated control is complex and weak, and the overvoltage problem after photovoltaic stacking is serious, resulting in low energy utilization.

[0003] 2) The system remains a rigid load on the power grid, unable to effectively release the flexibility value of massive base station batteries, and is difficult to support the interactive needs of new power systems.

[0004] Therefore, it is necessary to provide a power supply system for optical-storage-direct-flexible communication base stations to solve the above problems. Summary of the Invention

[0005] The purpose of this application is to provide a power supply system for a photovoltaic-storage-DC-flexible communication base station, which solves the problems of low efficiency of multi-stage conversion, complex collaborative control, low energy utilization, and inability to interact bidirectionally with the power grid caused by the patchwork architecture of existing base station power supply systems with "AC as the main and DC as the auxiliary".

[0006] To achieve the above objectives, this application provides the following solution: This application provides a power supply system for a photovoltaic-storage-direct-current-flexible communication base station, which includes: an AC / DC flexible bidirectional converter module, a photovoltaic DC / DC converter module, an energy storage bidirectional DC / DC converter module, a DC375V bus, and a -48V DC / DC converter module. The AC / DC flexible bidirectional converter module is connected to the AC power supply on its AC side and to the DC 375V bus on its DC side. The photovoltaic DC / DC converter module is connected to the photovoltaic power generation device on its low-voltage side and to the DC 375V bus on its high-voltage side. The energy storage bidirectional DC / DC converter module is connected to the energy storage battery pack on its low-voltage side and to the DC 375V bus on its high-voltage side. The -48V DC / DC converter module is connected to the DC 375V bus. The AC / DC flexible bidirectional converter module is used for: In rectification mode, power is supplied to the DC375V bus; In inverter mode, the DC power on the DC375V bus is fed into the AC power supply. The photovoltaic DC / DC converter module is used to feed photovoltaic power into the DC 375V bus. The energy storage bidirectional DC / DC converter module is used for charge and discharge control based on the voltage status of the DC375V bus. The -48VDC / DC converter module is used to power communication equipment within a communication base station. Among them, the AC / DC flexible bidirectional converter module, the photovoltaic DC / DC converter module, and the energy storage bidirectional DC / DC converter module achieve graded stable control of the DC375V bus voltage by coordinating the control of the DC375V bus voltage.

[0007] In one embodiment, when the photovoltaic power generation is greater than the sum of the load power and the energy storage charging power, the AC / DC flexible bidirectional converter module operates in inverter mode, feeding the DC power on the DC375V bus into the AC power supply.

[0008] In one embodiment, the AC / DC flexible bidirectional converter module operates in rectification mode, including any of the following cases: When the photovoltaic power generation is less than the load power and the energy storage battery pack capacity is lower than the preset threshold; When a power grid dispatch instruction is received requesting the absorption of mains power; When the system starts up and the photovoltaic power generation is zero.

[0009] In one embodiment, the hierarchical stability control specifically includes: When the photovoltaic power generation is greater than the sum of the load power, energy storage charging power and inverter grid-connected power, the photovoltaic DC / DC converter module will dominate the control of the DC375V bus voltage. When the photovoltaic power generation is less than the load power, the voltage of the DC375V bus is controlled by the energy storage bidirectional DC / DC converter module through discharge control. When the photovoltaic power generation is less than the load power and the energy storage battery pack charge is lower than the preset threshold, the AC / DC flexible bidirectional converter module operates in rectification mode to control the voltage of the DC375V bus. When the photovoltaic power generation is greater than the load power but less than the sum of the load power and the energy storage charging power, the energy storage bidirectional DC / DC converter module controls the voltage of the DC375V bus through charging control.

[0010] In one embodiment, the power supply system for the optical-storage-direct-flexible communication base station further includes: a mains power access module and an emergency diesel generator power access module; The AC power source includes mains power and / or an emergency diesel generator; Among them, the AC side of the AC / DC flexible bidirectional converter module is connected to the mains power through the mains power access module; And / or, the AC side of the AC / DC flexible bidirectional converter module is connected to the emergency diesel generator via the emergency diesel generator power access module.

[0011] In one embodiment, the power supply system for the photovoltaic-storage-direct-drive-flexible communication base station further includes: a photovoltaic array access module; The low-voltage side of the photovoltaic DC / DC converter module is connected to the photovoltaic power generation device through the photovoltaic array access module.

[0012] In one embodiment, the power supply system for the optical-storage-direct-flexible communication base station further includes: an energy storage battery pack access module; The low-voltage side of the energy storage bidirectional DC / DC converter module is connected to the energy storage battery pack via the energy storage battery pack access module.

[0013] In one embodiment, the power supply system for the optical-storage-direct-flexible communication base station further includes: a DC lighting feeder port for the equipment room and a DC air conditioning feeder port for the equipment room; The DC375V busbar is connected to the supporting lighting equipment through the DC lighting feedout port of the computer room, and the DC375V busbar is connected to the supporting cooling equipment through the DC air conditioning feedout port of the computer room. The DC375V bus couples the power of the AC / DC flexible bidirectional converter module, the photovoltaic DC / DC converter module, and the energy storage bidirectional DC / DC converter module, and then distributes the power flexibly to the supporting lighting equipment through the DC lighting feed port of the computer room, to the supporting cooling equipment through the DC air conditioning feed port of the computer room, and to the communication equipment through the -48V DC / DC converter module.

[0014] In one embodiment, the power supply system of the optical-storage-direct-flexible communication base station further includes: a communication equipment feed port, which is connected to a DC375V bus via a -48VDC / DC converter module; The DC375V bus supplies power to the communication equipment sequentially through the -48V DC / DC converter module and the communication equipment feedout port.

[0015] In one embodiment, the high-voltage side input of the -48VDC / DC converter module is adapted to a wide voltage range of a DC375V bus.

[0016] According to the specific embodiments provided in this application, this application has the following technical effects: This application discloses a photovoltaic-storage-DC-flexible communication base station power supply system. By constructing an integrated DC architecture with a DC 375V bus as the core, the AC / DC flexible bidirectional converter, photovoltaic DC / DC converter, and energy storage bidirectional DC / DC converter are directly connected to the same bus, realizing efficient coupling and direct use of photovoltaic, energy storage, and grid power. This eliminates the multi-stage AC-DC conversion links in traditional solutions, significantly improving system energy efficiency. Simultaneously, by utilizing the energy storage module's autonomous response to the bus voltage and the coordinated control of the three converters, graded stable regulation of the bus voltage is achieved. Under different operating conditions, different modules automatically lead voltage stability, simplifying control logic and enhancing system reliability and dynamic response capabilities. Furthermore, the AC / DC flexible bidirectional converter has bidirectional energy flow capabilities, enabling the base station to not only draw power from the grid but also feed redundant photovoltaic or energy storage energy into the grid. This transforms the traditional rigid load into a flexible and controllable distributed energy node, providing bidirectional interactive support for peak shaving and frequency regulation for the grid. This fundamentally solves the problems of low efficiency, complex control, and inflexible interaction in existing patchwork architectures. Attached Figure Description

[0017] To more clearly illustrate the technical solutions in the embodiments of this application or the prior art, the drawings used in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 A schematic diagram of the functional modules of a power supply system for a direct-to-flexible optical communication base station provided in an embodiment of this application.

[0019] Figure label: AC / DC Flexible Bidirectional Converter Module-1, Photovoltaic DC / DC Converter Module-2, Energy Storage Bidirectional DC / DC Converter Module-3, DC375V Bus-4, -48V DC / DC Converter Module-5, Mains Power Access Module-6, Emergency Diesel Generator Power Access Module-7, Photovoltaic Array Access Module-8, Energy Storage Battery Pack Access Module-9, Data Center DC Lighting Feedout Port-10, Data Center DC Air Conditioning Feedout Port-11, Communication Equipment Feedout Port-12. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] This application aims to completely reconstruct the energy architecture of base stations, establish a "photovoltaic-storage-DC-flexible" system with a DC375V bus as the backbone, realize efficient direct connection between photovoltaics, energy storage and DC loads, improve energy efficiency, overcome the defects of existing "multi-stage conversion, multi-stage energy storage" schemes such as multi-stage conversion, complex control, low energy efficiency and inability to interact bidirectionally with the grid, achieve efficient coordination and flexible scheduling of photovoltaics, energy storage and grid power, and enable base stations to have the flexible adjustment capabilities of bidirectional interaction with the grid and participation in peak shaving and frequency regulation, transforming them into flexible and controllable distributed energy nodes, capable of deeply participating in grid peak shaving, frequency regulation and virtual power plant bidirectional interaction in an aggregated form, providing massive and high-quality flexible resources for building a new power system.

[0022] To make the above-mentioned objectives, features and advantages of this application more apparent and understandable, the application will be further described in detail below with reference to the accompanying drawings and specific embodiments.

[0023] In one exemplary embodiment, such as Figure 1 As shown, a power supply system for a photovoltaic-storage-direct-current-flexible communication base station is provided, wherein the power supply system includes: an AC / DC flexible bidirectional converter module 1, a photovoltaic DC / DC converter module 2, an energy storage bidirectional DC / DC converter module 3, a DC375V bus 4, and a -48V DC / DC converter module 5.

[0024] The AC side of the AC / DC flexible bidirectional converter module 1 is connected to the AC power supply, and the DC side of the AC / DC flexible bidirectional converter module 1 is connected to the DC375V bus 4. The low-voltage side of the photovoltaic DC / DC converter module 2 is connected to the photovoltaic power generation device, and the high-voltage side of the photovoltaic DC / DC converter module 2 is connected to the DC375V bus 4. The low-voltage side of the energy storage bidirectional DC / DC converter module 3 is connected to the energy storage battery pack, and the high-voltage side of the energy storage bidirectional DC / DC converter module 3 is connected to the DC375V bus 4. The -48V DC / DC converter module 5 is connected to the DC375V bus 4.

[0025] AC / DC flexible bidirectional converter module 1 is used for: In rectification mode, it supplies power to DC375V bus 4; in inverter mode, it feeds the DC power on DC375V bus 4 into the AC power supply.

[0026] The photovoltaic DC / DC converter module 2 is used to feed photovoltaic power into the DC 375V bus 4.

[0027] The energy storage bidirectional DC / DC converter module 3 is used for charging and discharging control based on the voltage status of the DC375V bus 4.

[0028] -48VDC / DC converter module 5 is used to power communication equipment within the communication base station.

[0029] Among them, the AC / DC flexible bidirectional converter module 1, the photovoltaic DC / DC converter module 2, and the energy storage bidirectional DC / DC converter module 3 achieve graded stable control of the DC375V bus 4 voltage by coordinating the control of the DC375V bus 4 voltage.

[0030] Specifically, the system's operation process under different operating conditions is as follows: When the photovoltaic power generation exceeds the power consumption of communication equipment, DC lighting in the computer room, and DC air conditioning in the computer room, the excess power is charged to the energy storage battery pack through the energy storage bidirectional DC / DC converter module 3. If there is still excess power, it is sent to the grid through the AC / DC flexible bidirectional converter module 1 to achieve self-generation and self-consumption, and surplus power to the grid. At the same time, the voltage of the DC375V bus 4 is stabilized by the inverter constant voltage value of the AC / DC flexible bidirectional converter module 1.

[0031] When the solar irradiance is low and fluctuates, and the photovoltaic power generation is slightly less than the power demand of communication equipment, DC lighting in the computer room, and DC air conditioning in the computer room, the short-term power difference is supplemented by the energy storage battery pack through the energy storage bidirectional DC / DC converter module 3. At this time, the voltage of the DC375V bus 4 is stabilized by the discharge constant voltage value of the energy storage bidirectional DC / DC converter module 3.

[0032] When the photovoltaic system does not generate electricity or the photovoltaic power generation is less than the power consumption of communication equipment, DC lighting in the computer room, and DC air conditioning in the computer room, 1) the energy storage battery pack supplements the difference in power through the energy storage bidirectional DC / DC converter module 3. At this time, the voltage of the DC375V bus 4 is stabilized by the discharge constant voltage value of the energy storage bidirectional DC / DC converter module 3; 2) when the state of charge (SOC) of the energy storage battery pack is lower than the critical value for reserve power, it stops discharging, and the AC / DC flexible bidirectional converter module 1 seamlessly switches to rectification mode to convert the mains power into DC power to maintain the system power supply. At this time, the voltage of the DC375V bus 4 is stabilized by the rectification constant voltage value of the AC / DC flexible bidirectional converter module 1.

[0033] This application further supports a precise grid demand response mode that uses a virtual power plant formed by aggregating massive base stations: when the grid side needs distributed energy nodes to release electricity to support the large grid, the energy storage battery pack switches to discharge mode and feeds out power to the DC375V bus 4 at maximum power through the energy storage bidirectional DC / DC converter module 3. At this time, the surplus electricity from photovoltaic power generation and energy storage battery packs, after ensuring the power consumption of communication equipment, DC lighting in the computer room, and DC air conditioning in the computer room, is sent to the grid through the AC / DC flexible bidirectional converter module 1 to respond to the energy support needs of the large grid.

[0034] When the grid side requires distributed energy nodes as load nodes to maximize the absorption of grid power, regardless of the operating state of the photovoltaic DC / DC converter module 2, the output power of the photovoltaic DC / DC converter module 2 is forcibly limited. If the SOC of the energy storage battery pack is not higher than the maximum value, the energy storage bidirectional DC / DC converter module 3 switches to charging mode to absorb the power of the DC375V bus 4. The AC / DC flexible bidirectional converter module 1 works in rectification mode, and all loads and energy storage in the system are supplied by grid power.

[0035] Under all the above operating modes, the AC / DC flexible bidirectional converter module 1 is in a state of seamless rectification / inversion switching, which can respond to power fluctuations caused by fluctuations in photovoltaic power generation, energy storage battery charge / discharge, DC lighting in the computer room, DC air conditioning in the computer room, and power consumption of communication equipment, stabilize the DC375V bus 4 voltage, and thus ensure the stable and reliable operation of the system.

[0036] Through the above-mentioned operation mode, the photovoltaic-storage-direct-flexible communication base station power system of this application not only realizes the efficient and green power supply and economical energy use of the base station itself, but also transforms it into a flexible and controllable distributed energy node. It can participate in the two-way interaction of grid peak regulation, frequency regulation and virtual power plant in an aggregated form, providing massive and high-quality flexible resources for the construction of a new power system.

[0037] As an optional implementation, when the photovoltaic power generation is greater than the sum of the load power and the energy storage charging power, the AC / DC flexible bidirectional converter module 1 operates in inverter mode, feeding the DC power on the DC375V bus 4 into the AC power supply.

[0038] As an optional implementation, the AC / DC flexible bidirectional converter module 1 operates in rectification mode, including any of the following cases: When the photovoltaic power generation is less than the load power and the energy storage battery pack capacity is lower than the preset threshold.

[0039] When a power grid dispatch instruction is received requesting the absorption of municipal power.

[0040] When the system starts up and the photovoltaic power generation is zero.

[0041] As an optional implementation, the hierarchical stability control specifically includes: When the photovoltaic power generation is greater than the sum of the load power, the energy storage charging power and the inverter grid-connected power, the photovoltaic DC / DC converter module 2 will dominate the control of the DC375V bus 4 voltage.

[0042] When the photovoltaic power generation is less than the load power, the voltage of the DC375V bus 4 is controlled by the energy storage bidirectional DC / DC converter module 3 through discharge control.

[0043] When the photovoltaic power generation is less than the load power and the energy storage battery pack charge is lower than the preset threshold, the AC / DC flexible bidirectional converter module 1 operates in rectification mode to control the voltage of the DC375V bus 4.

[0044] When the photovoltaic power generation is greater than the load power but less than the sum of the load power and the energy storage charging power, the energy storage bidirectional DC / DC converter module 3 controls the voltage of the DC375V bus 4 through the charging master control.

[0045] In a more refined voltage band control strategy, intelligent voltage band control is achieved through AC / DC flexible bidirectional converter module 1, photovoltaic DC / DC converter module 2, and energy storage bidirectional DC / DC converter module 3: 1) When the photovoltaic power generation is greater than the sum of the load power, the energy storage charging power and the inverter grid connection power, the photovoltaic DC / DC converter module 2 controls the DC375V bus 4 voltage.

[0046] 2) When the photovoltaic power generation is less than the sum of the load power and the energy storage charging power, the AC / DC flexible bidirectional converter module 1 stops inverter grid connection, and the energy storage bidirectional DC / DC converter module 3 controls the DC375V bus voltage with a constant charging voltage value.

[0047] 3) When the photovoltaic power generation is less than the load power, the energy storage bidirectional DC / DC converter module 3 controls the DC375V bus 4 voltage with a discharge constant voltage value. If the energy storage discharge power still cannot balance the system power demand and the DC375V bus 4 voltage continues to drop, the AC / DC flexible bidirectional converter module 1 controls the DC375V bus 4 voltage with a rectification constant voltage value.

[0048] As an optional implementation, the power supply system for the optical-storage-direct-flexible communication base station further includes: a mains power access module 6 and an emergency diesel generator power access module 7; the AC power supply includes mains power and / or an emergency diesel generator.

[0049] Among them, the AC side of the AC / DC flexible bidirectional converter module 1 is connected to the mains power through the mains power access module 6.

[0050] And / or, the AC side of the AC / DC flexible bidirectional converter module 1 is connected to the emergency diesel generator via the emergency diesel generator power access module 7.

[0051] Specifically, the AC side of the AC / DC flexible bidirectional converter module 1 can be connected to the mains power through the three-phase four-wire mains power access module 6, and can be connected to the backup power through the emergency diesel generator power access module 7. The DC side outputs DC375V to the DC375V bus 4 or feeds back the power to the AC / DC flexible bidirectional converter module 1 through the DC375V bus 4 and connects to the grid through the mains power access module 6 to realize the grid connection of surplus power. It also has communication function, supporting the upper-level dispatching system to control the AC / DC flexible bidirectional converter module 1 to perform demand response management, and realize the functions of participating in grid peak shaving and frequency regulation, demand response, and virtual power plant aggregation node.

[0052] As an optional implementation, the power supply system for the photovoltaic-storage-DC-flexible communication base station further includes: a photovoltaic array access module 8; the low-voltage side of the photovoltaic DC / DC converter module 2 is connected to the photovoltaic power generation device through the photovoltaic array access module 8.

[0053] Specifically, the photovoltaic DC / DC converter module 2 has voltage regulation, current regulation, and maximum power point tracking (MPPT) functions, realizing maximum power tracking and system maximum voltage regulation control. When necessary, it can also automatically cancel solar power and stabilize the voltage of DC375V bus 4.

[0054] As an optional implementation, the power supply system for the optical-storage-direct-flexible communication base station further includes: an energy storage battery pack access module 9; the low-voltage side of the energy storage bidirectional DC / DC converter module 3 is connected to the energy storage battery pack through the energy storage battery pack access module 9.

[0055] Specifically, the low-voltage side of the bidirectional DC / DC converter module 3 is connected to the energy storage battery pack via the energy storage battery pack access module 9, while the high-voltage side outputs to the DC375V bus 4. The bidirectional DC / DC converter module 3 features black-start functionality, voltage regulation, current regulation, and voltage band control, enabling the energy storage system to automatically charge and discharge based on the voltage of the DC375V bus 4. It also has communication capabilities, supporting the upper-level dispatching system to control the bidirectional DC / DC converter module 3 for energy storage charging and discharging management.

[0056] As an optional implementation, the power supply system of the optical-storage-direct-flexible communication base station further includes: a DC lighting feeder port 10 for the equipment room and a DC air conditioning feeder port 11 for the equipment room; the DC375V bus 4 is connected to the supporting lighting equipment through the DC lighting feeder port 10 for the equipment room, and the DC375V bus 4 is connected to the supporting cooling equipment through the DC air conditioning feeder port 11 for the equipment room.

[0057] The DC375V bus 4 couples the electrical energy of the AC / DC flexible bidirectional converter module 1, the photovoltaic DC / DC converter module 2, and the energy storage bidirectional DC / DC converter module 3, and distributes the power flexibly to the supporting lighting equipment through the computer room DC lighting feedout port 10, to the supporting cooling equipment through the computer room DC air conditioning feedout port 11, and to the communication equipment through the -48V DC / DC converter module 5.

[0058] As an optional implementation, the power supply system of the optical-storage-direct-flexible communication base station further includes: a communication equipment feed port 12, which is connected to the DC375V bus 4 through a -48VDC / DC converter module 5.

[0059] DC375V bus 4 supplies power to the communication equipment via -48V DC / DC converter module 5 and communication equipment feedout port 12.

[0060] As an optional implementation, the high-voltage side input of the -48VDC / DC converter module 5 is adapted to the wide voltage range of the DC375V bus 4.

[0061] Specifically, the high-voltage side of the -48VDC / DC converter module 5 is adapted to the wide voltage range of the DC375V bus 4, converting the voltage from DC375V level to DC-48V level, and providing a reliable power supply to the communication equipment through the communication equipment feedout port 12.

[0062] This application provides a photovoltaic-storage-DC-flexible communication base station power supply system. The AC / DC flexible bidirectional converter enables bidirectional interaction between the base station and the power grid, and also serves as a DC375V bus voltage stabilization and control device. The photovoltaic system is coupled to the mains power and energy storage after passing through the DC / DC converter. The energy storage battery pack is connected to the DC375V bus through the bidirectional DC / DC converter. The DC air conditioning and DC lighting on the load side use DC375V power distribution. Traditional communication loads are connected to the DC375V bus through a -48V DC / DC converter, thus reconstructing the base station power supply architecture.

[0063] This application addresses the shortcomings of existing "solar-storage" solutions, such as low efficiency, weak coordination, and difficult control, achieving efficient local consumption of new energy and multi-energy synergy. Ultimately, it transforms base stations from traditional rigid loads into flexible and controllable distributed energy nodes. While ensuring reliable power supply and communication, these nodes deeply participate in grid peak shaving and frequency regulation, demand response, and virtual power plant aggregation, realizing the dual value of energy saving and cost reduction for the base station itself and providing flexible resources to the grid. This application can be used in various scenarios such as communication macro base station equipment rooms, communication indoor distributed system base station equipment rooms, communication hub station equipment rooms, and communication buildings, achieving efficient coordinated operation of photovoltaic, energy storage, and grid power, improving energy utilization efficiency, and reducing operating costs. Through DC bus architecture and flexible power distribution design, the system possesses good compatibility and scalability, supporting seamless switching between multiple power sources and ensuring continuous and stable operation of communication equipment. Simultaneously, the wide voltage range adaptability enhances tolerance to photovoltaic power generation fluctuations, increasing the proportion of renewable energy consumption and aligning with the green and low-carbon development direction. Specifically, this is reflected in the following aspects: 1) Improved efficiency and reliability: The DC bus architecture eliminates the need for multiple AC-DC conversion stages, increasing the overall system energy efficiency to over 95%; deep collaboration between photovoltaics, energy storage, and mains power ensures uninterrupted power supply to base stations around the clock, significantly enhancing reliability.

[0064] 2) Significant economic benefits: Intelligent bus voltage control enables "low storage and high release", maximizing the use of low-priced green electricity and significantly reducing electricity costs; the system is highly integrated, reducing the number of devices and maintenance costs.

[0065] 3) Outstanding contribution to green carbon reduction: Through direct DC use and intelligent dispatch, the local photovoltaic consumption rate is greatly improved, reducing dependence on fossil energy.

[0066] 4) Innovation in grid interaction capabilities: This transforms massive base stations from rigid loads into flexible and adjustable distributed energy nodes, enabling them to accurately respond to grid peak shaving and frequency regulation needs in an aggregated manner, providing high-quality and flexible resources for building new power systems and creating new commercial and social value.

[0067] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0068] This document uses specific examples to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand the system and core ideas of this application. Furthermore, those skilled in the art will recognize that, based on the ideas of this application, there will be changes in the specific implementation methods and application scope. Therefore, the content of this specification should not be construed as a limitation of this application.

Claims

1. A power supply system for a fiber-optic-storage-direct-drive-flexible communication base station, characterized in that, The power supply system for the photovoltaic-storage-direct-flexible communication base station includes: an AC / DC flexible bidirectional converter module, a photovoltaic DC / DC converter module, an energy storage bidirectional DC / DC converter module, a DC375V bus, and a -48V DC / DC converter module; The AC / DC flexible bidirectional converter module is connected to the AC power supply on its AC side and to the DC 375V bus on its DC side. The photovoltaic DC / DC converter module is connected to the photovoltaic power generation device on its low-voltage side and to the DC 375V bus on its high-voltage side. The energy storage bidirectional DC / DC converter module is connected to the energy storage battery pack on its low-voltage side and to the DC 375V bus on its high-voltage side. The -48V DC / DC converter module is connected to the DC 375V bus. The AC / DC flexible bidirectional converter module is used for: In rectification mode, power is supplied to the DC375V bus; In inverter mode, the DC power on the DC375V bus is fed into the AC power supply. The photovoltaic DC / DC converter module is used to feed photovoltaic power into the DC 375V bus. The energy storage bidirectional DC / DC converter module is used for charge and discharge control based on the voltage status of the DC375V bus. The -48VDC / DC converter module is used to power communication equipment within a communication base station. Among them, the AC / DC flexible bidirectional converter module, the photovoltaic DC / DC converter module, and the energy storage bidirectional DC / DC converter module achieve graded stable control of the DC375V bus voltage by coordinating the control of the DC375V bus voltage.

2. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, When the photovoltaic power generation is greater than the sum of the load power and the energy storage charging power, the AC / DC flexible bidirectional converter module operates in inverter mode, feeding the DC power on the DC375V bus into the AC power supply.

3. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The AC / DC flexible bidirectional converter module operates in rectification mode, including any of the following scenarios: When the photovoltaic power generation is less than the load power and the energy storage battery pack capacity is lower than the preset threshold; When a power grid dispatch instruction is received requesting the absorption of mains power; When the system starts up and the photovoltaic power generation is zero.

4. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The hierarchical stability control specifically includes: When the photovoltaic power generation is greater than the sum of the load power, energy storage charging power and inverter grid-connected power, the photovoltaic DC / DC converter module will dominate the control of the DC375V bus voltage. When the photovoltaic power generation is less than the load power, the voltage of the DC375V bus is controlled by the energy storage bidirectional DC / DC converter module through discharge control. When the photovoltaic power generation is less than the load power and the energy storage battery pack charge is lower than the preset threshold, the AC / DC flexible bidirectional converter module operates in rectification mode to control the voltage of the DC375V bus. When the photovoltaic power generation is greater than the load power but less than the sum of the load power and the energy storage charging power, the energy storage bidirectional DC / DC converter module controls the voltage of the DC375V bus through charging control.

5. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The power supply system for the optical-storage direct-flex communication base station also includes: a mains power access module and an emergency diesel generator power access module; The AC power source includes mains power and / or an emergency diesel generator; Among them, the AC side of the AC / DC flexible bidirectional converter module is connected to the mains power through the mains power access module; And / or, the AC side of the AC / DC flexible bidirectional converter module is connected to the emergency diesel generator via the emergency diesel generator power access module.

6. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The power supply system for the photovoltaic-storage direct-flexible communication base station also includes: a photovoltaic array access module; The low-voltage side of the photovoltaic DC / DC converter module is connected to the photovoltaic power generation device through the photovoltaic array access module.

7. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The power supply system for the optical-storage direct-flex communication base station also includes: an energy storage battery pack access module; The low-voltage side of the energy storage bidirectional DC / DC converter module is connected to the energy storage battery pack via the energy storage battery pack access module.

8. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The power supply system for the optical-storage direct-flexible communication base station also includes: a DC lighting feeder port for the equipment room and a DC air conditioning feeder port for the equipment room; The DC375V busbar is connected to the supporting lighting equipment through the DC lighting feedout port of the computer room, and the DC375V busbar is connected to the supporting cooling equipment through the DC air conditioning feedout port of the computer room. The DC375V bus couples the power of the AC / DC flexible bidirectional converter module, the photovoltaic DC / DC converter module, and the energy storage bidirectional DC / DC converter module, and then distributes the power flexibly to the supporting lighting equipment through the DC lighting feed port of the computer room, to the supporting cooling equipment through the DC air conditioning feed port of the computer room, and to the communication equipment through the -48V DC / DC converter module.

9. The power supply system for a direct-drive flexible optical communication base station according to claim 8, characterized in that, The power supply system for the optical-storage direct-flexible communication base station also includes: a communication equipment feed port, which is connected to a DC375V bus via a -48VDC / DC converter module; The DC375V bus supplies power to the communication equipment sequentially through the -48V DC / DC converter module and the communication equipment feedout port.

10. The power supply system for a direct-drive flexible optical communication base station according to claim 1, characterized in that, The high-voltage side input of the -48VDC / DC converter module is adapted to a wide voltage range of the DC375V bus.

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