Light storage charging and discharging integrated sodium ion industrial and commercial energy storage system
By adopting sodium-ion batteries and an energy management system, combined with DC-DC power modules and energy storage converters, the thermal runaway and switching problems of industrial and commercial energy storage systems have been solved, achieving uninterrupted power supply and energy optimization, and realizing near-zero carbon clean energy utilization.
Patent Information
- Application Number
- CN202423000668.4
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-12-05
- Publication Date
- 2025-12-09
- Estimated Expiration
- 2034-12-05
AI Technical Summary
Existing industrial and commercial energy storage systems suffer from problems such as high risk of thermal runaway of lithium-ion batteries, inflexible switching modes leading to load power outages, lack of load tracking, and suboptimal energy management.
It uses sodium-ion batteries, which are safer, as the energy storage medium. The energy management unit analyzes the photovoltaic power generation and the status of the energy storage battery in real time, and automatically switches between grid connection and off-grid. Combined with DC-DC power modules and energy storage converters, it ensures uninterrupted power supply to the load. It is equipped with fire protection and liquid-cooled air conditioning systems to reduce risks and achieve load tracking and energy optimization.
It effectively avoids the risk of thermal runaway of lithium-ion batteries, ensures uninterrupted power supply to the load, achieves optimized tracking of load demand and maximizes the utilization of clean energy, and achieves the goal of near-zero carbon application.
Smart Images
Figure CN223651968U_ABST
Abstract
Description
TECHNICAL FIELD
[0001] The utility model relates to sodium ion battery photovoltaic energy storage technical field, concretely is a kind of light storage fills and discharges integrated sodium ion industrial and commercial energy storage system. BACKGROUND
[0002] The existing industrial and commercial energy storage system mostly uses lithium ion battery as energy storage battery, and the risk of thermal runaway is higher.In addition, the existing industrial and commercial energy storage system mostly realizes simple peak clipping strategy, simply runs grid-connected mode or off-grid mode, a few run grid-connected and off-grid switching mode and cannot realize seamless and inductive switching, which will cause load power failure in switching process.Finally, the existing industrial and commercial energy storage system mostly lacks load tracking, cannot realize optimal energy management and utilization, and cannot realize near-zero carbon application scenario, therefore, the sodium ion industrial and commercial energy storage system is designed, so that the grid-connected process of the energy storage system will not power failure, and the management and utilization of energy are maximized. UTILITY MODEL CONTENT
[0003] The utility model aims at providing a kind of light storage fills and discharges integrated sodium ion industrial and commercial energy storage system, by using the sodium ion battery with higher safety as energy storage medium, effectively avoids the risk of thermal runaway of lithium ion battery;Energy management unit carries out grid-connected and off-grid switching automatically by intelligent analysis on photovoltaic power generation, energy storage battery state and other parameters, ensures uninterrupted power supply of load, and realizes optimized tracking of load demand, maximizes clean energy utilization, and achieves near-zero carbon application target.
[0004] The utility model provides the following technical scheme: a kind of light storage fills and discharges integrated sodium ion industrial and commercial energy storage system, including photovoltaic power generation unit, inverter unit, energy storage unit and energy management unit, the energy storage unit is sodium ion battery, the inverter unit is energy storage converter, the energy management unit is EMS energy management system, the EMS energy management system is accurate to perceive power demand by real-time acquisition load side electric meter data, realizes load tracking, and EMS energy management system will analyze photovoltaic power generation and energy storage battery power parameters, automatically switches grid-connected and off-grid mode according to pre-prepared optimization strategy, ensures uninterrupted power supply of load;
[0005] The photovoltaic power generation unit comprises multiple photovoltaic panels, DC-DC power modules are connected to the photovoltaic panels, the DC-DC power modules are connected with energy storage converters, the DC-DC power modules are also connected with sodium ion batteries, the energy storage converters are also connected with power grids, STS switches are arranged between the energy storage converters and the power grids, the STS switches are used to ensure continuous power supply of loads during grid-connected and off-grid switching processes, the energy storage converters are also connected with the loads, direct current generated by the photovoltaic panels is subjected to voltage adjustment through the DC-DC power modules, the direct current is converted into alternating current through the energy storage converters, and the power is used for load demand, and the excess power is used for charging the sodium ion batteries, and the excess power is uploaded to the power grid through the energy storage converters after the sodium ion batteries are fully charged.
[0006] Further, the sodium ion battery is connected with a BMS battery management system, and the data of the battery is uploaded to an EMS energy management system through detection of the running state of the battery.
[0007] Further, the fire extinguishing unit is a gas fire extinguishing pipeline system, and perfluorohexone fire extinguishing medium is arranged in the gas fire extinguishing pipeline system.
[0008] Further, the liquid cooling air conditioning system is arranged on the sodium ion battery, the working environment of the sodium ion battery is detected, and the thermal runaway risk of the sodium ion battery is ensured through temperature and humidity control and heat dissipation detection.
[0009] Further, the photovoltaic power generation unit comprises seven photovoltaic panels, DC-DC power modules are connected to each photovoltaic panel, the energy storage unit comprises four clusters of parallel battery clusters, each cluster comprises five packs, each pack comprises 52 battery cells, and a total of 1040 battery cells, seven parallel photovoltaic panels are connected with four clusters of parallel battery clusters and energy storage converters through DC-DC power modules, the battery clusters and the energy storage converters are connected, the inverter unit further comprises three parallel energy storage converters, one master machine and two slave machines, and the energy storage converters are connected with loads and power grids to provide power for the loads.
[0010] Further, another power supply power grid is connected in parallel with the load, and the load is powered through the other power supply power grid, so that the normal operation of the load is not affected when the photovoltaic panel does not generate power.
[0011] Compared with the prior art, the sodium ion battery with higher safety is used as the energy storage medium, the thermal runaway risk of the lithium ion battery is effectively avoided, the energy management unit automatically performs grid-connected and off-grid switching through intelligent analysis of photovoltaic power generation, energy storage battery state and other parameters, the power supply of the load is ensured to be uninterrupted, the optimization tracking of load demand is realized, the utilization of clean energy is maximized, and the application target of near-zero carbon is achieved. BRIEF DESCRIPTION OF DRAWINGS
[0012] The accompanying drawings are included to provide a further understanding of the present application, and are incorporated in and constitute a part of the specification, illustrate embodiments of the present application and serve to explain the present application, and do not constitute a limitation of the present application. In the drawings:
[0013] Figure 1 is a system module diagram of the present application;
[0014] Figure 2 is an electrical schematic diagram of the present application;
[0015] Figure 3 is a control flow diagram of the energy storage system of the present application;
[0016] In the drawings: 1, photovoltaic power generation unit; 2, inverter unit; 3, fire-fighting unit; 4, liquid-cooled air conditioning unit; 5, energy storage unit; 51, BMS battery management system; 6, energy management unit; 7, STS switch. DETAILED DESCRIPTION
[0017] The technical solutions in the embodiments of the present application will be described clearly and completely below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor fall within the scope of protection of the present application.
[0018] Please refer to Figure 1 and Figure 2 The present application provides a technical solution: a sodium-ion industrial and commercial energy storage system integrated with photovoltaic storage and charging, comprising a photovoltaic power generation unit 1, an inverter unit 2, an energy storage unit 5, and an energy management unit 6. The energy storage unit 5 is a sodium-ion battery, the inverter unit 2 is an energy storage converter, the energy storage converter is used to convert direct current into alternating current, the energy management unit 6 is an EMS energy management system, the EMS energy management system accurately senses the power demand by collecting load-side electric meter data in real time, realizes load tracking, and simultaneously analyzes the photovoltaic power generation capacity and the energy storage battery capacity parameters, automatically switches and goes off-grid mode according to the pre-prepared optimization strategy, and ensures uninterrupted power supply for the load, as shown in Figure 3 The EMS energy management system detects the photovoltaic power, load power, and single-cell voltage, compares the photovoltaic power and load power, and determines the maximum and minimum values of the single-cell voltage, judges the operation mode of the system, and makes the system in grid-connected or off-grid state.
[0019] The photovoltaic power generation unit 1 includes multiple photovoltaic panels, and a DCDC power module is connected to the photovoltaic panels. The DCDC power module is used to convert the current generated by the photovoltaic panels. The DCDC power module is connected to an energy storage converter and a sodium ion battery. The DCDC power module is also connected in parallel with the energy storage converter and the sodium ion battery. This allows the current generated by the photovoltaic panels to be fed into the sodium ion battery to charge it. The current can also be fed into the energy storage converter to convert the direct current generated by the photovoltaic panels into alternating current to power the load. The energy storage converter is also connected to the power grid. Excess alternating current can be fed into the power grid to sell electricity on the grid. An STS switch 7 is provided between the energy storage converter and the power grid. The STS switch 7 allows the on-grid and off-grid switching time to be less than 20ms, ensuring that the load remains powered during the on-grid and off-grid process. The energy storage converter is also connected to the load. The direct current generated by the photovoltaic panels is adjusted in voltage by the DCDC power module. The direct current is then converted into alternating current by the energy storage converter to power the load. Excess power is used to charge the sodium ion battery. When the sodium ion battery is fully charged, the excess power is fed into the power grid through the energy storage converter to sell excess power on the grid. In summary, the energy storage system mainly uses photovoltaic power generation, supplemented by energy storage power supply, and the power grid as an emergency solution. This ensures that the load is powered first while maximizing the use of clean energy and achieving a near-zero carbon application scenario.
[0020] The energy storage unit 5 is connected to a BMS battery management system 51. The BMS battery management system 51 detects the operating state of the battery and uploads the battery capacity and temperature data to the EMS energy management system. The EMS energy management system can control the destination of the excess power based on the battery capacity.
[0021] It also includes a fire extinguishing unit 3, which is a gas fire extinguishing pipeline system containing perfluorohexone fire extinguishing medium. The fire extinguishing unit 3 is connected to the EMS energy management system for data transmission. Based on real-time temperature data, it effectively prevents and extinguishes fires, minimizing personnel and property losses.
[0022] It includes a liquid-cooled air conditioning unit 4 installed on the sodium ion battery to detect the working environment of the sodium ion battery. Through temperature and humidity control and heat dissipation detection, it ensures the risk of thermal runaway of the sodium ion battery and prolongs its service life.
[0023] As Figure 2As shown, the photovoltaic power generation unit 1 includes 7 photovoltaic panels, 6 of which are installed on the roof and 1 of which is installed in the container, a DCDC power module is connected to each photovoltaic panel, the energy storage unit 5 includes four clusters of parallel battery clusters, each cluster has five packs, each pack has 52 cells, a total of 1040 cells, the 7 parallel photovoltaic panels are connected in parallel through the DCDC power module, and are connected in parallel with four clusters of parallel battery clusters and an energy storage converter, the battery clusters are also connected to the energy storage converter, the inverter unit 2 further includes three parallel energy storage converters, one master and two slaves, the energy storage converter is connected in parallel with a load and a power grid, the energy storage converter provides power for the load, and the energy storage converter can also grid-connect excess power.
[0024] Another power supply is also connected in parallel to the load, when the current generated by the photovoltaic panel is not enough for the load, the power grid is connected to the load to provide power for the load to meet the power demand of the load.
[0025] As shown in Figure 3 The control process of the energy storage system is as follows:
[0026] Off-grid mode: the dual power switch DO6 is set to one, DO4 and DO5 are set to zero, at this time the EMS does not need to control the PCS power.
[0027] Grid-connected mode:
[0028] After the EMS starts, the PCS AC voltage is first set to 4000 and the AC voltage frequency is set to 5000, then the active power of the photovoltaic meter and the power of the load meter are read, the highest voltage and the lowest voltage of the BMS single cell are read, and finally the running state of the PCS is judged.
[0029] When the PCS runs in off-grid mode, the EMS receives the off-grid mode state of the PCS (the EMS responds to the off-grid mode according to the PCS grid-connected and off-grid switching control process ≤ 30s), and the EMS completes the response within 30s, first sets the working mode of the PCS to AC constant voltage.
[0030] When the photovoltaic power < load power, and the single cell minimum voltage < 2.65V (which can be modified in real time through the EMS station control large screen), the off-grid mode is switched to the grid-connected mode, the dual power switch DO5 is set to one, DO4 and DO6 are set to zero, and the EMS performs grid-connected control (the EMS receives the grid-connected mode state of the PCS, and the EMS completes the response within 30s, first sets the working mode of the PCS to AC constant power, then sets the PCS AC active power to the load meter power and the AC reactive power, and finally sets the PCS to start) to preferentially supply power to the load and charge the energy storage with the remaining power.
[0031] When photovoltaic power > load power, and the single highest voltage ≥ 3.6V (which can be modified by EMS station control large screen in real time), at this time, the off-grid mode is switched to the grid mode, the dual power switch DO4 is set to one, DO5 and DO6 are set to zero, the EMS performs grid control (the EMS receives the PCS grid mode state, the EMS completes the response within 30s, first sets the working mode of the PCS to AC constant power, then sets the PCS AC active setting to the photovoltaic power meter output power and the AC reactive setting, and finally sets the PCS to start), the load is preferentially powered, and the remaining power is fed into the grid.
[0032] When the PCS operates in the grid mode, the EMS receives the PCS grid mode state (the EMS performs grid response according to the PCS grid and off-grid switching control process ≤ 30s), and the EMS completes the response within 30s, and sets the working mode of the PCS to AC constant power.
[0033] When the dual power switch DO4 is set to one, the photovoltaic power < the load power, and the single lowest voltage ≤ 3.5V (which can be modified by the EMS station control large screen in real time), at this time, the grid mode is switched to the off-grid mode, the dual power switch DO4, DO5 is set to zero, and DO6 is set to one, the EMS performs off-grid control (the EMS completes the response within 30s, first sets the working mode of the PCS to AC constant voltage, and then sets the PCS to start), and the photovoltaic and energy storage simultaneously power the load.
[0034] When the dual power switch DO5 is set to one, the photovoltaic power > 60KW (which can be modified by the EMS station control large screen in real time), the single highest voltage is between 2.8V-3.6V (which can be modified by the EMS station control large screen in real time), or the single highest voltage > 3.6V, at this time, the grid mode is switched to the off-grid mode, the EMS performs off-grid control (the EMS completes the response within 30s, first sets the working mode of the PCS to AC constant voltage), and then sets the PCS to start, and preferentially powers the load.
[0035] When the PCS operates in the ready-to-run mode, the EMS sets the working mode of the PCS to off-grid, the dual power switch DO6 is set to one, DO4 and DO5 are set to zero, and the EMS issues a start command to the PCS.
[0036] Finally, it should be noted that the above only describes preferred embodiments of the present application and is not intended to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions described in the foregoing embodiments or make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the present application shall be included in the protection scope of the present application.
Claims
1. An integrated photovoltaic-storage-charge-discharge sodium-ion industrial and commercial energy storage system, comprising a photovoltaic power generation unit, an inverter unit, an energy storage unit, and an energy management unit, characterized in that: The energy storage unit is a sodium-ion battery, the inverter unit is an energy storage converter, and the energy management unit is an EMS energy management system. The EMS energy management system accurately senses the electricity demand by collecting load-side meter data in real time and realizes load tracking. At the same time, the EMS energy management system analyzes the photovoltaic power generation and energy storage battery power parameters, and automatically switches to off-grid mode according to the pre-defined optimization strategy to ensure uninterrupted power supply to the load. The photovoltaic power generation unit includes multiple photovoltaic panels, each connected to a DC-DC power module. The DC-DC power module is connected to an energy storage converter and also to a sodium-ion battery. The energy storage converter is also connected to the power grid. An STS (Switching Switch) is installed between the energy storage converter and the power grid to ensure uninterrupted power supply during grid-connected / off-grid switching. The energy storage converter is also connected to the load. The DC power generated by the photovoltaic panels is regulated by the DC-DC power module and then converted to AC power by the energy storage converter. This AC power is used to meet the load's needs, and any excess power is used to charge the sodium-ion battery. Once the sodium-ion battery is fully charged, any remaining power is connected to the grid via the energy storage converter.
2. The integrated sodium-ion industrial and commercial energy storage system based on photovoltaic storage and charge / discharge as described in claim 1, characterized in that: The sodium-ion battery is connected to a BMS (Battery Management System), which monitors the battery's operating status and uploads the battery data to the EMS (Energy Management System).
3. The integrated sodium-ion industrial and commercial energy storage system according to claim 1, characterized in that: It also includes a fire-fighting unit, which is a gas extinguishing pipeline system containing perfluorohexanone as the extinguishing medium.
4. The integrated sodium-ion industrial and commercial energy storage system according to claim 1, characterized in that: The system includes a liquid-cooled air conditioning system installed on the sodium-ion battery to monitor the working environment of the sodium-ion battery. By controlling the temperature and humidity and monitoring heat dissipation, the system ensures that the sodium-ion battery is free from the risk of thermal runaway.
5. The integrated sodium-ion industrial and commercial energy storage system according to claim 1, characterized in that: The photovoltaic power generation unit includes seven photovoltaic panels, each connected to a DC-DC power module. The energy storage unit includes four parallel battery clusters, each cluster having five packs, each pack having 52 cells, for a total of 1040 cells. The seven parallel photovoltaic panels are connected to the four parallel battery clusters and energy storage inverters via the DC-DC power modules. The inverter unit also includes three parallel energy storage inverters: one master inverter and two slave inverters. The energy storage inverters are connected in parallel to the load and the power grid to provide power to the load.
6. The integrated sodium-ion industrial and commercial energy storage system according to claim 5, characterized in that: The load is also connected in parallel to another power grid.