Novel rural power grid optical storage charging source system

Abstract

The utility model relates to a novel rural power grid light storage charging power supply system which not only can be used as an emergency power supply of a rural power grid, but also can be used as a power supply of a rural direct current street lamp, is good in use applicability, good in use safety and good in use effect, and is characterized in that a battery cabinet is arranged in a battery cabinet chamber, a PCS cabinet is arranged in a PCS cabinet chamber, and an EMS cabinet is arranged in an EMS cabinet chamber; a grid-connected control cabinet is arranged in the grid-connected control cabinet chamber, an air conditioner is arranged on the outer side of the electric manhole well chamber, a plurality of multimedia direct-current street lamps are arranged on the outer side of the energy storage box body, the battery cabinet supplies power to direct-current street lamps in the multimedia direct-current street lamps through the PCS cabinet, and the battery cabinet supplies power to a 5G base station, the air conditioner and the EMS cabinet in the multimedia direct-current street lamps through the PCS cabinet and the grid-connected control cabinet. The solar cell module charges the cell cabinet through the PCS cabinet, and the grid-connected control cabinet is connected with the box-type transformer through the ATS power supply automatic switching device. The system not only can be used as an emergency power supply of a rural power grid, but also can be used as a power supply of rural direct-current street lamps.

Description

Technical Field

[0001] This utility model belongs to the field of agricultural power grid energy storage system manufacturing technology, specifically relating to a new type of agricultural power grid photovoltaic-storage-charging power supply system. Background Technology

[0002] With the commencement of the national economic development plan and the 2035 long-term vision, and the continued advancement of medium- and long-term "dual carbon" initiatives, newly constructed new energy projects are required to be equipped with energy storage systems of a certain specification (in some parts of my country, energy storage has already been equipped at approximately 10% of the project construction scale). These energy storage systems can be used as emergency power sources for the power grid. Currently, energy storage systems used as emergency power sources are fixed, primarily used in urban power grids. However, due to the vast geographical area, long lines, dispersed loads, small transformer capacity, and low level of intelligence in my country's rural power grids, the use of fixed energy storage systems in rural power grids faces many limitations (high cost, immobility, etc.), making it impossible to achieve full coverage of rural power grids (especially in remote rural areas). To address these issues, our company has developed a new type of rural power grid photovoltaic-storage-charging power system. This system not only serves as an emergency power source for the power grid but also features a portable overall structure, making it particularly suitable for use in remote rural power grids. It can compensate for the shortcomings of existing fixed energy storage systems, better serving the new countryside and benefiting farmers. Utility Model Content

[0003] Design objective: To overcome the shortcomings of the prior art, this paper designs a new type of rural power grid photovoltaic-storage-charging power system that can not only serve as an emergency power source for rural power grids but also as a power source for rural DC streetlights, while also possessing good applicability, safety, and performance.

[0004] Design scheme: To achieve the above design objectives.

[0005] 1. The energy storage box contains, from left to right, a power manhole chamber, a battery cabinet chamber, a PCS cabinet chamber, an EMS cabinet chamber, and a grid-connected control cabinet chamber. The battery cabinet chamber houses a battery cabinet, the PCS cabinet chamber houses a PCS cabinet, the EMS cabinet chamber houses an EMS cabinet, and the grid-connected control cabinet chamber houses a grid-connected control cabinet. An air conditioner is installed on the outside of the power manhole chamber, capable of supplying cold air into the energy storage box. Multiple multimedia DC streetlights are installed on the outside of the energy storage box. The battery cabinet supplies power to the DC streetlights in the multimedia DC streetlights via the PCS cabinet. The battery cabinet supplies power to the 5G base station in the multimedia DC streetlights via the PCS cabinet and the grid-connected control cabinet. The battery cabinet supplies power to the air conditioner via the PCS cabinet and the grid-connected control cabinet. The battery cabinet supplies power to the EMS cabinet via the PCS cabinet and the grid-connected control cabinet. The solar cell modules charge the battery cabinet via the PCS cabinet. The grid-connected control cabinet is connected to the box-type transformer via an ATS power automatic switching device. This design is one of the technical features of this utility model. The purpose of this design is as follows: From left to right, the energy storage box contains a power manhole chamber, a battery cabinet chamber, a PCS cabinet chamber, an EMS cabinet chamber, and a grid-connected control cabinet chamber. The battery cabinet chamber houses a battery cabinet; the PCS cabinet chamber houses a PCS cabinet; the EMS cabinet chamber houses an EMS cabinet; and the grid-connected control cabinet chamber houses a grid-connected control cabinet. An air conditioner is located on the outside of the power manhole chamber and can supply cool air to the energy storage box. Multiple multimedia DC streetlights are installed on the outside of the energy storage box. The battery cabinet supplies power to the DC streetlights in the multimedia DC streetlights via the PCS cabinet. The battery cabinet also supplies power to the 5G base station in the multimedia DC streetlights via the PCS cabinet and the grid-connected control cabinet. Furthermore, the battery cabinet supplies power to the air conditioner via the PCS cabinet and the grid-connected control cabinet. The control cabinet supplies power to the EMS cabinet, and the solar cell modules charge the battery cabinet through the PCS cabinet. The grid-connected control cabinet is connected to the box-type transformer via an ATS power automatic switching device. This new type of rural power grid photovoltaic-storage-charging power system can not only serve as an emergency power source for the rural power grid (providing strong support for key loads), but also as a power source for rural DC streetlights. In addition, to effectively reduce the heat generated during battery cluster operation, an industrial air conditioning cooling system is adopted, and the battery cabinet and PCS cabinet are placed as close as possible to the air conditioner, with the air conditioner vents facing the battery clusters to maximize the cooling effect. Thus, this new type of rural power grid photovoltaic-storage-charging power system has a good heat dissipation effect. Furthermore, the energy storage box facilitates the transportation and installation of this new type of rural power grid photovoltaic-storage-charging power system, meeting the needs of vast rural areas, meaning it has better applicability.

[0006] 2. The energy storage container is a shipping container, and the upper surface of the container is provided with a gable roof. The design of mounting the solar panels of the solar cell module on the gable roof is the second technical feature of this utility model. The purpose of this design is that the energy storage container is a shipping container, and the upper surface of the container is provided with a gable roof. The solar panels of the solar cell module are mounted on the gable roof. The gable roof structure gives the energy storage container a better waterproof effect. In addition, the gable roof structure also has the advantages of simple manufacturing process and good heat insulation effect at the top of the container.

[0007] 3. The battery cabinet contains battery clusters, and the battery cabinet is equipped with a fire extinguishing device capable of extinguishing fires on the battery clusters within the cabinet. The design of the battery cabinet supplying power to the fire extinguishing device via a PCS cabinet and a grid-connected control cabinet is the third technical feature of this utility model. The purpose of this design is that, in the rural power grid energy storage system, to prevent accidental fires involving the battery clusters, a hanging-type fire suppression system and smoke detectors are installed directly above the battery cluster cabinet to ensure battery operation safety, thereby improving the safety of this new type of rural power grid photovoltaic-storage-charging power system.

[0008] 4. The PCS cabinet is equipped with a first energy storage converter, a second energy storage converter, and an isolation transformer. The battery clusters in the battery cabinet supply power to the DC streetlights in the multimedia DC streetlights through the first and second energy storage converters in the PCS cabinet. The battery clusters in the battery cabinet supply power to the 5G base station in the multimedia DC streetlights through the first energy storage converter, the isolation transformer, and the grid-connected control cabinet in the PCS cabinet. The battery clusters in the battery cabinet supply power to the air conditioner through the first energy storage converter, the isolation transformer, and the grid-connected control cabinet in the PCS cabinet. The battery clusters in the battery cabinet supply power to the fire extinguishing device through the first energy storage converter, the isolation transformer, and the grid-connected control cabinet in the PCS cabinet. The design that the solar cell modules charge the battery cabinet through the first energy storage converter in the PCS cabinet is the fourth technical feature of this utility model. The purpose of this design is as follows: the PCS cabinet is equipped with a first energy storage converter, a second energy storage converter, and an isolation transformer. The battery clusters in the battery cabinet supply power to the DC streetlights in the multimedia DC streetlights through the first and second energy storage converters in the PCS cabinet. The battery clusters in the battery cabinet supply power to the 5G base station in the multimedia DC streetlights through the first energy storage converter, the isolation transformer, and the grid-connected control cabinet in the PCS cabinet. The battery clusters in the battery cabinet supply power to the air conditioner through the first energy storage converter, the isolation transformer, and the grid-connected control cabinet in the PCS cabinet. The battery clusters in the battery cabinet supply power to the fire extinguishing device through the first energy storage converter, the isolation transformer, and the grid-connected control cabinet in the PCS cabinet. The solar cell modules charge the battery cabinet through the first energy storage converter in the PCS cabinet. The isolation transformer not only prevents the mains power from impacting the energy storage system but also provides a neutral point for the line. This not only further improves the safety of using this new type of rural power grid photovoltaic-storage-charging power system but also enhances its performance.

[0009] Technical Solution: A novel rural power grid photovoltaic-storage-charging power supply system includes an energy storage box, solar cell modules, multiple multimedia DC streetlights, an air conditioner, an ATS (Automatic Power Switching System), a box-type transformer, a battery cabinet, a PCS (Polymer Capacitor System) cabinet, an EMS (Electronic Management System) cabinet, and a grid-connected control cabinet. The energy storage box contains, from left to right, a power manhole chamber, a battery cabinet chamber, a PCS cabinet chamber, an EMS cabinet chamber, and a grid-connected control cabinet chamber. The battery cabinet chamber houses a battery cabinet, the PCS cabinet chamber houses a PCS cabinet, the EMS cabinet chamber houses an EMS cabinet, and the grid-connected control cabinet chamber houses a grid-connected control cabinet. The power manhole chamber is located on the outside of... The system is equipped with an air conditioner that can deliver cool air into the energy storage box. Multiple multimedia DC streetlights are installed on the outside of the energy storage box. The battery cabinet supplies power to the DC streetlights in the multimedia DC streetlights through the PCS cabinet. The battery cabinet supplies power to the 5G base station in the multimedia DC streetlights through the PCS cabinet and the grid-connected control cabinet. The battery cabinet supplies power to the air conditioner through the PCS cabinet and the grid-connected control cabinet. The battery cabinet supplies power to the EMS cabinet through the PCS cabinet and the grid-connected control cabinet. The solar cell modules charge the battery cabinet through the PCS cabinet. The grid-connected control cabinet is connected to the box-type transformer through an ATS power automatic switching device.

[0010] Compared with the prior art, this utility model provides a new type of rural power grid photovoltaic-storage-charging power supply system that not only serves as an emergency power source for rural power grids but also as a power source for rural DC streetlights. It also boasts good applicability, safety, and performance. Attached Figure Description

[0011] Figure 1 This is a schematic diagram of a new type of rural power grid photovoltaic-storage-charging power system.

[0012] Figure 2 This is a cross-sectional structural diagram of the energy storage box in a new type of rural power grid photovoltaic-storage-charging power system. Detailed Implementation

[0013] Example 1: Refer to Appendix Figures 1-2A novel rural power grid photovoltaic-storage-charging system includes an energy storage box 1, solar cell modules 2, multiple multimedia DC streetlights 3, an air conditioner 4, an ATS (Automatic Power Switch) device 5, a box-type transformer 6, a battery cabinet 7, a PCS (Polymer Capacitor System) cabinet 8, an EMS (Electronic Management System) cabinet 9, and a grid-connected control cabinet 10. The energy storage box 1 contains, from left to right, a power manhole chamber, a battery cabinet chamber, a PCS cabinet chamber, an EMS cabinet chamber, and a grid-connected control cabinet chamber. The battery cabinet chamber houses the battery cabinet 7, the PCS cabinet chamber houses the PCS cabinet 8, the EMS cabinet chamber houses the EMS cabinet 9, and the grid-connected control cabinet chamber houses the grid-connected control cabinet 10. An air conditioner 4 is located outside the power manhole chamber and is capable of... Cool air is supplied to the energy storage box 1. Multiple multimedia DC streetlights 3 are installed on the outside of the energy storage box 1. The battery cabinet 7 supplies power to the DC streetlights 31 within the multimedia DC streetlights 3 via the PCS cabinet 8. The battery cabinet 7 supplies power to the 5G base station 32 within the multimedia DC streetlights 3 via the PCS cabinet 8 and the grid-connected control cabinet 10. The battery cabinet 7 supplies power to the air conditioner 4 via the PCS cabinet 8 and the grid-connected control cabinet 10. The battery cabinet 7 supplies power to the EMS cabinet 9 via the PCS cabinet 8 and the grid-connected control cabinet 10. The solar cell module 2 charges the battery cabinet 7 via the PCS cabinet 8. The grid-connected control cabinet 10 is connected to the box-type transformer 6 via the ATS power automatic switching device 5. The EMS cabinet 9 mainly manages the operation of the battery clusters and PCS, and transmits the battery cluster and PCS charging and discharging data (mainly including parameters such as current, voltage, capacity, and charging / discharging time), battery temperature data, and their operating status to the background monitoring system.

[0014] When the fire extinguishing system (i.e., fire extinguishing device) in the battery cluster cabinet (i.e., battery cabinet 7) is activated, the outlet switch QF3 (100A), grid-connected switch QF4 (100A), energy storage switch QF2 (250A), and photovoltaic control switch QF1 (20A) will automatically disconnect to ensure safety. The status of the photovoltaic control switch QF1 (20A), energy storage switch QF2 (250A), outlet switch QF3 (100A), and grid-connected switch QF4 (100A) can be remotely controlled through the background monitoring platform system. The photovoltaic control switch QF1 (20A) is an AC switch controlling the energy storage input line; the energy storage switch QF2 (250A) is a DC switch controlling the energy storage battery cluster line; the outlet switch QF3 (100A) is an AC switch for the energy storage grid-connected side line; and switches (1, 2, 3) QF are rural DC street light control switches.

[0015] The energy storage container 1 is a shipping container, and the upper surface of the shipping container is provided with a gable roof. The solar panels in the solar cell module 2 are installed on the gable roof.

[0016] Since the battery clusters and PCS and other main components in the energy storage box 1 are not allowed to be infiltrated by rainwater during operation, the box must meet the waterproof requirements. The use of a gable roof structure gives the energy storage box 1 a good waterproof effect. In addition, the gable roof structure also has the advantages of simple manufacturing process and good heat insulation effect at the top of the box.

[0017] Due to the widespread distribution of rural power grids, the locations of energy storage equipment can vary greatly. The enclosures must be adaptable to harsh environments such as extreme cold, high corrosion, and high temperatures. Therefore, the material of the enclosures must not be sensitive to environmental temperature. For example, high-strength weathering steel (SPA-H type) is required for enclosures in extremely cold and corrosive regions. This type of weathering steel can maintain its structural strength even at temperatures around -40℃. In general areas, ordinary steel plates such as Q345 are sufficient.

[0018] Currently, our company uses the following two types of sheet materials for manufacturing energy storage boxes: one type is used in ordinary areas, which uses aluminum-zinc coated sheet with anticorrosive wood, ordinary cold-rolled sheet, or composite color steel sheet structure; the other type is high-strength weather-resistant steel for harsh areas (mostly used in international standard container structures).

[0019] In addition, to prevent materials from rusting during processing and affecting the quality of subsequent painting processes, the pretreatment of the parts' surface becomes particularly important. Therefore, after the parts are processed, the material surface is required to undergo surface treatment to remove oil and dirt.

[0020] One method is to use traditional chemical processes (which have a significant negative impact on the environment): for thin sheet materials and small parts, pickling and phosphating solutions are generally used to passivate the material surface and cover it with a protective film to achieve rust prevention.

[0021] Secondly, physical processes are used, which means that the surface of thick plates (thickness ≥ 3mm), profiles or large components is generally sandblasted before entering the processing to remove rust and oil stains from the surface.

[0022] Third, after the energy storage box is welded, the surface of each weld (seam) should be treated with a second local sandblasting process to ensure the rust prevention effect of the entire box surface.

[0023] In addition, actual tests have verified its effectiveness. To ensure the sandblasting effect on different material surfaces, the following working requirements for abrasive particle size and sandblasting working air pressure yield better results. Table 1 shows the selection of key parameters for the sandblasting process:

[0024] Serial Number Sandblasting operations Parameter value 1 Work pressure (MPa) 0.5-0.8 2 <![CDATA[Gas consumption (m 3 / min)]]> 3-7 3 Abrasive particle size (mm) φ0.1-0.3 4 Rust removal grade (Sa) 2.5-3.0

[0025] Table 1

[0026] The battery cabinet 7 contains battery clusters and a fire extinguishing device that can extinguish fires in the battery clusters. The battery cabinet 7 is powered by the fire extinguishing device through the PCS cabinet 8 and the grid-connected control cabinet 10.

[0027] Currently, commonly used fire protection systems (fire extinguishing devices) fall into the following two categories:

[0028] 1) This is a drip-type fire extinguishing device, which is mainly suitable for extinguishing fires in small spaces. It is activated primarily by a temperature sensor inside the enclosure (generally set to a standard activation temperature of 68°C). Rural power grid energy storage systems, due to their small capacity and limited space for battery-based fire suppression, are equipped with this type of drip-type fire extinguishing device.

[0029] 2) Intelligent fire extinguishing devices are often used when the energy storage box has a large space for protecting the battery. This often involves using both heat and smoke sensors to activate the fire extinguishing system, making the fire protection system more reliable. Upon receiving smoke and heat signals, the intelligent fire extinguishing device's main unit immediately sends alarm and trip signals to the corresponding switch control system and battery management system in the background system, automatically stopping the battery management system and halting the energy storage system.

[0030] The PCS cabinet 8 is equipped with a first energy storage converter 81, a second energy storage converter 82, and an isolation transformer 83. The battery clusters in the battery cabinet 7 supply power to the DC streetlights 31 in the multimedia DC streetlights 3 through the first energy storage converter 81 and the second energy storage converter 82 in the PCS cabinet 8. The battery clusters in the battery cabinet 7 supply power to the 5G base station 32 in the multimedia DC streetlights 3 through the first energy storage converter 81, the isolation transformer 83, and the grid-connected control cabinet 10 in the PCS cabinet 8. The battery clusters in the battery cabinet 7 supply power to the air conditioner 4 through the first energy storage converter 81, the isolation transformer 83, and the grid-connected control cabinet 10 in the PCS cabinet 8. The battery clusters in the battery cabinet 7 supply power to the fire extinguishing device through the first energy storage converter 81, the isolation transformer 83, and the grid-connected control cabinet 10 in the PCS cabinet 8. The solar cell module 2 charges the battery cabinet 7 through the first energy storage converter 81 in the PCS cabinet 8. The isolation transformer 83 is a 50KVA isolation transformer, used to prevent the mains power from impacting the energy storage system and to provide a line neutral point. The first energy storage converter 81 is a bidirectional converter of the same capacity.

[0031] Start-up steps for a new type of rural power grid photovoltaic-storage-charging power system:

[0032] Under normal mains power supply conditions

[0033] First, close the grid connection switch QF4 (100A) in the grid connection control cabinet 10. After closing the switch, close the circuit breakers for lighting, air conditioning, platform communication, etc. one by one. The grid connection control cabinet 10 will start, and the street lights, lighting, air conditioning 4 and EMS cabinet 9 will start running.

[0034] Step 2: Close the UPS power input circuit breaker in the EMS cabinet. The UPS will start and the EMS cabinet and battery system will work normally after the UPS starts.

[0035] Step 3: Open the energy storage switch QF2 (250A) of battery cabinet 7, close the high voltage box circuit breaker in energy storage switch QF2 (250A), and check whether the system is normal on the display screen. If the display is normal, start the grid connection control cabinet 10. After successful grid connection, the battery system startup is complete.

[0036] Step 4: First close the DC circuit breaker in PCS cabinet 8. After the indicator light comes on, close the AC circuit breaker and check the display screen for any alarms. If there are no alarms, the startup is complete.

[0037] Operational strategy

[0038] Normal operating conditions (with mains power)

[0039] The ATS automatic power switching device 5 is powered by the mains by default. The power generated by the photovoltaic system is used to charge the energy storage battery first, and at the same time to power the street lights. The surplus power of the photovoltaic system is fed into the grid. At this time, the charging and discharging strategy of the energy storage device EMS should be set to not discharge when there is mains power to prevent the surplus energy of the energy storage system from being fed into the grid.

[0040] Abnormal operating conditions (no mains power):

[0041] When the ATS automatic power switching device 5 switches to the backup power side, the EMS charging and discharging strategy of the energy storage device should be set to start discharging when there is no mains power, and supply power to the emergency load. At this time, the photovoltaic inverter can still work normally, and the power generated by the photovoltaic will first charge the energy storage battery and supply power to the street lights, and the surplus power will supply the emergency load.

[0042] Mains power has been restored:

[0043] The ATS automatic power switching device 5 switches back to AC power supply, and at this time the operation and energy storage charging and discharging strategy is the normal operating condition (with AC power) strategy.

[0044] It should be understood that although the above embodiments provide a relatively detailed textual description of the design concept of this utility model, these textual descriptions are merely simple textual descriptions of the design concept of this utility model, and not limitations on the design concept of this utility model. Any combination, addition, or modification that does not exceed the design concept of this utility model shall fall within the protection scope of this utility model.

Claims

1. A novel rural power grid photovoltaic-storage-charging power system, comprising an energy storage box (1), solar cell modules (2), multiple multimedia DC streetlights (3), an air conditioner (4), an ATS power automatic switching device (5), a box-type transformer (6), a battery cabinet (7), a PCS cabinet (8), an EMS cabinet (9), and a grid-connected control cabinet (10), characterized in that: The energy storage box (1) is provided with a power manhole chamber, a battery cabinet chamber, a PCS cabinet chamber, an EMS cabinet chamber, and a grid connection control cabinet chamber from left to right. The battery cabinet chamber is equipped with a battery cabinet (7), the PCS cabinet chamber is equipped with a PCS cabinet (8), the EMS cabinet chamber is equipped with an EMS cabinet (9), and the grid connection control cabinet chamber is equipped with a grid connection control cabinet (10). An air conditioner (4) is provided on the outside of the power manhole chamber and the air conditioner (4) can deliver cold air into the energy storage box (1). Multiple multimedia DC streetlights (3) are provided on the outside of the energy storage box (1). The battery cabinet (7) provides multimedia DC streetlights through the PCS cabinet (8). The DC streetlight (31) in the DC streetlight (3) is powered by the battery cabinet (7), which powers the 5G base station (32) in the multimedia DC streetlight (3) through the PCS cabinet (8) and the grid-connected control cabinet (10). The battery cabinet (7) powers the air conditioner (4) through the PCS cabinet (8) and the grid-connected control cabinet (10). The battery cabinet (7) powers the EMS cabinet (9) through the PCS cabinet (8) and the grid-connected control cabinet (10). The solar cell module (2) charges the battery cabinet (7) through the PCS cabinet (8). The grid-connected control cabinet (10) is connected to the box-type transformer (6) through the ATS power automatic switching device (5).

2. The novel agricultural power grid photovoltaic-storage-charging power supply system according to claim 1, characterized in that: The energy storage box (1) is a container, and the upper surface of the container is provided with a gable roof. The solar panels in the solar cell assembly (2) are installed on the gable roof.

3. The novel agricultural power grid photovoltaic-storage-charging power supply system according to claim 1, characterized in that: The battery cabinet (7) is equipped with battery clusters and a fire extinguishing device that can extinguish the fire in the battery clusters. The battery cabinet (7) is powered by the fire extinguishing device through the PCS cabinet (8) and the grid-connected control cabinet (10).

4. The novel agricultural power grid photovoltaic-storage-charging power supply system according to claim 1, characterized in that: The PCS cabinet (8) is equipped with a first energy storage converter (81), a second energy storage converter (82), and an isolation transformer (83). The battery clusters in the battery cabinet (7) supply power to the DC streetlights (31) in the multimedia DC streetlights (3) through the first energy storage converter (81) and the second energy storage converter (82) in the PCS cabinet (8). The battery clusters in the battery cabinet (7) supply power to the DC streetlights (31) in the multimedia DC streetlights (3) through the first energy storage converter (81), the isolation transformer (83), and the grid-connected control cabinet (10) in the PCS cabinet (8). The 5G base station (32) is powered by the battery cluster in the battery cabinet (7). The battery cluster in the battery cabinet (7) is powered by the first energy storage converter (81), isolation transformer (83) and grid-connected control cabinet (10) in the PCS cabinet (8). The battery cluster in the battery cabinet (7) is powered by the first energy storage converter (81), isolation transformer (83) and grid-connected control cabinet (10) in the PCS cabinet (8). The solar cell module (2) is charged by the first energy storage converter (81) in the PCS cabinet (8).

5. A novel agricultural power grid photovoltaic-storage-charging power supply system according to claim 4, characterized in that: The first energy storage converter (81) is a bidirectional converter of the same capacity.

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