CN211880178U - Source and load storage hybrid energy system for commercial park - Google Patents

Abstract

The utility model relates to a source storage and charge hybrid energy system of a commercial park, which comprises a lithium iron phosphate battery energy storage unit, a distributed photovoltaic unit, a charging pile unit, a power distribution network and a source storage and charge centralized monitoring unit, wherein the power distribution network is respectively connected with the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit; the source charge centralized monitoring unit is respectively connected with the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit; the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit are all arranged in a commercial park. Compared with the prior art, the utility model has the advantages of safe and reliable, generating efficiency is high, energy-concerving and environment-protective.

Description

Source and load storage hybrid energy system for commercial park

Technical Field

The utility model belongs to the technical field of the commercial park hybrid energy and specifically relates to a source storage lotus hybrid energy system in commercial park is related to.

Background

Energy development in China is entering a brand new stage from total expansion to quality and efficiency improvement, and a new situation of constructing a clean low-carbon energy supply system and creating safe and efficient energy consumption becomes the direction and the target of energy development in China. The commercial park source-storage-load hybrid energy system combined with renewable energy is beneficial to improving the comprehensive utilization rate of energy and realizing the optimal configuration of energy.

Most of the current commercial park source-storage-load hybrid energy systems pay attention to coordination control planning among various energy sources, and still have great improvement space for the commercial park source-storage-load hybrid energy system architecture and monitoring of various components of the source-storage-load hybrid energy system.

SUMMERY OF THE UTILITY MODEL

The utility model aims at providing a source storage lotus hybrid energy system of reliable and stable, control comprehensive commercial park in order to overcome the defect that above-mentioned prior art exists.

The purpose of the utility model can be realized through the following technical scheme:

a source and charge storage hybrid energy system of a commercial park comprises a lithium iron phosphate battery energy storage unit, a distributed photovoltaic unit, a charging pile unit, a power distribution network and a source and charge storage centralized monitoring unit, wherein the power distribution network is respectively connected with the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit;

the source charge centralized monitoring unit is respectively connected with the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit;

the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit are all arranged in a commercial park.

Further, the energy storage unit of the lithium iron phosphate battery adopts a square aluminum shell 37Ah battery cell.

Further, the lithium iron phosphate battery energy storage unit comprises a lithium iron phosphate battery, an energy storage converter and a box transformer substation which are sequentially connected, and the box transformer substation is connected with the power distribution network.

Further, the energy storage converter is a bidirectional converter.

Further, the tank becomes a double split transformer.

Furthermore, the distributed photovoltaic unit comprises a polycrystalline silicon photovoltaic component, a grid-connected inverter and a switch cabinet which are connected in sequence, and the switch cabinet is connected with the power distribution network.

Furthermore, the polycrystalline silicon photovoltaic component is a polycrystalline silicon photovoltaic component with a PID attenuation resisting function.

Further, the grid-connected inverter is connected to the switch cabinet through an alternating current return box.

Furthermore, the source charge and discharge centralized monitoring unit comprises a computer monitoring subunit, an energy storage monitoring subunit and a photovoltaic monitoring subunit, the energy storage monitoring subunit comprises an energy storage converter, a BAMS battery stack management system and a box transformer substation in the lithium iron phosphate battery energy storage unit, the energy storage converter, the BAMS battery stack management system and the box transformer substation are all connected with the computer monitoring subunit, the photovoltaic monitoring subunit comprises a communication manager and a grid-connected inverter in the distributed photovoltaic unit, and the computer monitoring subunit is connected with the grid-connected inverter through the communication manager.

Further, the computer monitoring subunit comprises a station control layer, a network layer and a spacing layer, the station control layer comprises a host, an operator station, a telemechanical workstation and/or an engineer station, the network layer comprises an optical cable or a shielded twisted pair, the spacing layer comprises electrical isolation units arranged in the switch cabinets, and the host, the operator station, the telemechanical workstation and the engineer station are connected with the electrical isolation units arranged in the switch cabinets through the optical cable or the shielded twisted pair; the energy storage converter, the BAMS battery stack management system and the box transformer substation are all connected with the host, the operator station, the telecontrol workstation and the engineer station.

Compared with the prior art, the utility model has the advantages of it is following:

(1) the utility model discloses source storage lotus hybrid energy system disposes distributed photovoltaic unit, and the source storage lotus hybrid energy system that introduces renewable energy-light energy into the commercial garden is favorable to improving energy comprehensive utilization, and is energy-concerving and environment-protective, realizes the optimal configuration of the energy.

(2) The utility model discloses a lithium iron phosphate battery energy storage unit to choose for use square aluminum hull 37Ah electricity core, have long service life, advanced reliable have advantages such as environment-friendly.

(3) The utility model discloses distributing type photovoltaic unit adopts polycrystalline silicon photovoltaic module, and polycrystalline silicon photovoltaic module's power specification is more, and the product is used extensively, satisfies the utility model discloses the source stores up the configuration needs of lotus hybrid energy system, and each item parameter is outstanding, can improve whole distributing type photovoltaic unit's power generation performance.

(4) The utility model discloses consider photovoltaic module's PID effect to photovoltaic module's influence, can make the power output decay of subassembly appear the decay, so adopt anti PID decay photovoltaic module, improve the utility model discloses source storage lotus hybrid energy system's stability and reliability.

(5) The utility model discloses computer monitoring subunit is including standing accuse layer, network layer and wall, and the center of standing accuse layer for the total station equipment is kept watch on, is measured, is controlled, is managed, and the wall is according to different voltage class and electrical isolation unit, arranges respectively in the cubical switchboard that corresponds, and under the condition that the accuse layer of standing became invalid, the wall still can independently accomplish the supervision and the circuit breaker control function of wall, improves the utility model discloses the reliability of source storage lotus hybrid energy system control.

Drawings

Fig. 1 is a schematic structural diagram of a source-storage-load hybrid energy system of a commercial park according to the present invention;

FIG. 2 is a schematic diagram of the connection circuit of the source load centralized monitoring unit of the present invention;

in the figure, 1, a source and load storage centralized monitoring unit, 11, a host, 12, a client host, 13, a printer, 14, a communication manager, 15, an external control system, 16, a switch, 2, an iron phosphate lithium battery energy storage unit, 21, an iron phosphate lithium battery, 22, an energy storage converter, 23, a box transformer, 3, a charging pile unit, 4, a distributed photovoltaic unit, 41, a polycrystalline silicon photovoltaic module, 42, a grid-connected inverter, 43, a switch cabinet, 5, a power distribution network, 6 and a cooling, heating and power load.

Detailed Description

The present invention will be described in detail below with reference to the accompanying drawings and specific embodiments. The embodiment is implemented on the premise of the technical solution of the present invention, and a detailed implementation manner and a specific operation process are given, but the scope of the present invention is not limited to the following embodiments.

Example 1

As shown in fig. 1, the present embodiment provides a source storage and charging hybrid energy system for a commercial park, which includes a lithium iron phosphate battery energy storage unit 2, a distributed photovoltaic unit 4, a charging pile unit 3, a power distribution network 5 and a source storage and charging centralized monitoring unit 1, where the power distribution network 5 is connected to the lithium iron phosphate battery energy storage unit 2, the distributed photovoltaic unit 4 and the charging pile unit 3 respectively;

the source charge centralized monitoring unit 1 is respectively connected with the lithium iron phosphate battery energy storage unit 2, the distributed photovoltaic unit 4 and the charging pile unit 3;

lithium iron phosphate battery energy storage unit 2, distributed photovoltaic unit 4 and fill electric pile unit 3 and all set up in the commercial garden.

Each part is described in detail below.

1. Lithium iron phosphate battery energy storage unit 2

The design scheme of the energy storage unit 2 of the lithium iron phosphate battery comprises the following steps:

101) energy storage battery model selection

In this embodiment, the lithium iron phosphate battery energy storage unit 2 based on the lithium iron phosphate battery system is adopted, a square aluminum shell 37Ah battery cell is selected, and the main performance parameters are shown in table 1.

Watch 137 Ah electric core parameter table

102) Energy storage unit access scheme

In the embodiment, the planned configuration capacity of the energy storage unit 2 of the lithium iron phosphate battery is 3.5MW/12.5MWh, and the energy storage unit is defined as a medium-sized electrochemical energy storage power station according to GB51048-2018 design specifications for electrochemical energy storage power stations. According to the specification of Q/GDW564-2010 energy storage system access power distribution network technical specification, the energy storage system above 200kW should be accessed to 10kV (6kV) and above voltage class power distribution network 5 in combination with the input data of the earlier stage field survey, and the energy storage unit of the embodiment is connected to a plant 110kV transformer substation 10kV power distribution device room through 2-time 10kV cable power collection lines and is accessed to the power distribution network 5.

103) Electrical main connection wire of energy storage unit

The lithium iron phosphate battery energy storage unit 2 comprises a lithium iron phosphate battery 21, an energy storage converter 22 and a box transformer substation 23 which are connected in sequence, and the box transformer substation 23 is connected with the power distribution network 5. The energy storage converter 22 is a bidirectional converter. The box transformer 23 is a double split transformer.

In this embodiment, the energy storage unit is connected to the power grid at 10kV in two loops. Energy storage converter 22 adopts 500kW bidirectional converter, and lithium iron phosphate battery energy storage unit 2 steps up to 10kV through 1 2500kVA and 1 1000kVA double split transformers respectively, and box transformer substation 23 collects the 10kV distribution device room that delivers to 110kV transformer substation in factory through 10kV current collection circuit, inserts the electric wire netting. In the embodiment, 1 2500kVA box transformer substation 23 is adopted, the model is SCB11-2500kVA/10, 10.5kV +/-2.5%/0.315 kV, and 1 1000kVA box transformer substation 23 is adopted, the model is SCB11-1000kVA/10, 10.5kV +/-2.5%/0.315 kV.

The main parameters of the energy storage converter PCS are shown in table 2.

104) Concrete structure of energy storage unit 2 of lithium iron phosphate battery

In the embodiment, the energy storage unit in the exemplary park is a preassembled energy storage complete set (comprising a storage battery, a battery cabinet, a direct current power distribution cabinet, an energy storage converter 22 and an alternating current power distribution device, which are highly integrated), a boosting power distribution system and an energy management system.

After the storage batteries are connected in series and in parallel in the battery cabinet and collected, the storage batteries are collected and input into the energy storage converter 22 through the direct current power distribution cabinet, the energy storage converter 22 is output to the alternating current power distribution cabinet, and the alternating current power distribution cabinet is connected to the 10kV side of the local 110kV transformer substation after being boosted.

In consideration of performance parameters, service life, post-maintenance difficulty and technical maturity of the storage battery, and in combination with factors such as site floor area and initial investment cost, the lithium iron phosphate battery 21 is adopted in the embodiment.

In the embodiment, 22 sets of energy storage systems are installed in a 40-foot container (the external dimension: the length is 12.192m multiplied by 2.438m multiplied by 2.591 m). Comprises the following steps: 17 sets of energy storage containers with the specification of 500kW/1.793MWh (19.5Ah battery cells) and 3 sets of energy storage containers with the specification of 500kW/1.944MWh (37Ah), wherein complete power supply, temperature control, fire protection and other facilities are arranged in each container. The method has the characteristics of low cost, simplicity in installation and debugging, low construction difficulty, convenience in expansion and the like.

Table 2 main parameters of energy storage converter PCS

2. Distributed photovoltaic unit 4

The distributed photovoltaic unit 4 comprises a photovoltaic module, a grid-connected inverter 42 and a switch cabinet 43 which are connected in sequence, and the switch cabinet 43 is connected with the power distribution network 5.

The design scheme of the distributed photovoltaic unit 4 in this embodiment includes the following steps:

201) scheme for connecting to power distribution network 5

The total installed capacity of the distributed photovoltaic units 4 is about 6282.54kWp, a mode of 'self-generation and surplus power internet access' is adopted, a plurality of factors such as the geographical position characteristics of a garden, the current situation of power system resources, feasible technology, high economical efficiency and the like are comprehensively considered, 18 photovoltaic sub-array units are planned and designed by a photovoltaic system in a power-driven garden, and 18 400V low-voltage grid-connected points are arranged in total. The new grid-connected switch cabinet 434 face of the power distribution room of the park formation grading workshop is a 1# to 4# grid-connected point, the new grid-connected switch cabinet 435 face of the power distribution room of the assembly workshop is a 5# to 9# grid-connected point, the new grid-connected switch cabinet 432 face of the power station power distribution room west side is a 10# to 11# grid-connected point, the new grid-connected switch cabinet 432 face of the power station power distribution room is a 12# to 13# grid-connected point, the new grid-connected switch cabinet 433 face of the power station power distribution room east side is a 14# to 16# grid-connected point, and the new grid-connected switch cabinet 432 face of the office building power distribution room is a 17# to 18# grid-connected point. The incoming and outgoing lines in the cabinet adopt a downward-incoming and upward-outgoing mode and are connected with the original distribution low-voltage switch cabinet 43 in parallel through busbars.

The specific individual point-of-presence access capacity is shown in table 3 below.

202) Electrical main wiring scheme

The photovoltaic module is mainly arranged in a powder slurry electrode workshop, an assembly workshop, a chemical component and volume workshop, a raw material three-dimensional bin, a finished product warehouse, an office building, a restaurant roof and a parking shed. The single crystal 285Wp component and the 60kW group series type inverter are adopted for configuration, the output voltage of each inverter is 380V three-phase alternating current, the three-phase alternating current is collected by the alternating current header boxes and then is respectively merged into 18 grid-connected points under a plant area low-voltage system, and finally the three-phase alternating current is accessed into a power grid at the voltage level of 400V. The access point positions of the photovoltaic power generation units are as follows:

the photovoltaic power generation unit of the powder slurry motor workshop is connected to the powder slurry motor workshop and a power distribution room of an office building;

the photovoltaic power generation unit of the assembly workshop is connected into the assembly workshop, an office building and a power station power distribution room;

a photovoltaic power generation unit of the component-volume workshop is connected into a power station power distribution room;

the photovoltaic power generation unit of the raw material three-dimensional warehouse is connected to a power station distribution room;

the photovoltaic power generation unit of the finished product warehouse is connected to a power station distribution room;

the photovoltaic power generation unit of the office building is connected to a power distribution room of the office building;

the restaurant photovoltaic power generation unit is connected to a power station power distribution room;

and the photovoltaic power generation unit of the photovoltaic parking lot is connected to a power station power distribution room.

TABLE 3 Single Point of Presence Access Capacity

203) Main equipment model selection

The distributed photovoltaic unit 4 comprises a photovoltaic module, a grid-connected inverter 42 and a switch cabinet 43 which are connected in sequence, and the switch cabinet 43 is connected with the power distribution network 5.

21. Photovoltaic module

The photovoltaic module is a core component of the photovoltaic power generation system, and the quality of each parameter index directly influences the power generation performance of the whole photovoltaic power generation system. The various parameters of the performance of the photovoltaic module mainly comprise: the component peak power, peak current, peak voltage, short circuit current, open circuit voltage, maximum system voltage, component efficiency, short circuit current temperature coefficient, open circuit voltage temperature coefficient, peak power temperature coefficient, etc. under standard test conditions. The power specification of the polysilicon photovoltaic module 41 is more, and the product application is also wider. Through market research, domestic mainstream manufacturers produce polycrystalline silicon photovoltaic modules 41 applied to photovoltaic power generation systems, the specifications of the polycrystalline silicon photovoltaic modules are mostly between 150Wp and 300Wp, and in the interval range, the module efficiency, the technical maturity and the optional space during purchasing and ordering are comprehensively considered. Therefore, the specification of the polysilicon photovoltaic module 41 selected by the embodiment of the invention is 285 Wp.

The technical parameters of the polysilicon photovoltaic module 41 are shown in table 4.

TABLE 4 technical parameter table of photovoltaic module

The PID effect of photovoltaic modules is a more frequent attenuation effect in the field of photovoltaics in recent years. As the voltage applied to the photovoltaic system increases, a high voltage also exists between the module and the frame, and the high voltage excites leakage current between the module and the frame, so that the power output attenuation of the module is attenuated. The photovoltaic module provided by the project should adopt a PID attenuation resistant photovoltaic module.

22. Grid-connected inverter 42

The inverter model selection mainly compares the following indexes.

Range of inverter input dc voltage: because the output voltage of the solar battery string is influenced by the sunlight intensity, weather conditions and load, the change range of the output voltage is large. The inverter is required to work normally in a larger direct current input voltage range, and the stability of alternating current output voltage is ensured.

Inverter output efficiency: when the high-power inverter is fully loaded, the efficiency must be more than 95% -98%. When the inverter with medium and small power is fully loaded, the efficiency must be more than 90%. Even in the case of 10% of rated power of the inverter, conversion efficiency of 90% (high-power inverter) or more is ensured.

Inverter output waveform: in order to supply power to the public power grid after direct current generated by the photovoltaic array is inverted, the output voltage waveform, amplitude, phase, frequency and the like of an inverter are required to be consistent with the public power grid so as to realize undisturbed smooth power supply to the power grid. The selected inverter has good output current waveform, and waveform distortion and frequency fluctuation are lower than the national standard requirement value.

Maximum power point tracking: the input termination impedance of the inverter should be adapted to the actual operating characteristics of the photovoltaic power generation system. And ensuring that the photovoltaic power generation system operates at the maximum power point.

Reliability and recoverability: the inverter should have certain anti-interference ability, environmental adaptability, instantaneous overload ability and various protection functions, such as: under the condition of overvoltage, the photovoltaic power generation system is required to normally operate; under the condition of overload, the inverter needs to automatically adjust an operating point to the direction of open-circuit voltage in a photovoltaic cell characteristic curve, and input power is limited within a given range; in the event of a fault, the inverter must be automatically disconnected from the main network.

Monitoring and data acquisition: the inverter should have multiple communication interfaces to carry out data acquisition and send to centralized control room, and supervisory equipment should also have simulation input port and links to each other with external sensor, measures data such as sunshine and temperature.

The main technical indexes of the inverter are as follows: rated capacity, output power factor, rated input voltage, current, voltage regulation rate, total harmonic distortion rate, and the like.

The specific technical parameters of the present engineering grid-connected inverter 42 are shown in table 5 below.

Table 560 kW group series inverter main technical parameter table

2.3, switch cabinet 43

Photovoltaic power generation is directly connected to a 400V standby switch cabinet of a plant powder slurry motor workshop, an office building, an assembly workshop and a power station power distribution room or is connected to a power grid in a 400V voltage level through an alternating current combiner box. The 400V standby switch cabinet of the original distribution room is utilized, and no new addition is needed.

204) Specific structure of distributed photovoltaic unit 4

In this embodiment, the distributed photovoltaic unit 4 is composed of 8 main grid-connected units, including: a powder slurry electrode workshop, an assembly workshop, a chemical component capacity workshop, a raw material three-dimensional bin, a finished product warehouse, an office building, a restaurant and a photovoltaic parking lot.

The single crystal 285Wp component and the 60kW group-series inverters are configured, the output voltage of each inverter is 380V three-phase alternating current, the three-phase alternating current is collected by an alternating current collecting box and then is merged into 18 grid-connected points under a 380V low-voltage system in a factory, the total installed capacity is 6.28MWp, and the mode of 'self-generation and self-utilization and residual power internet access' is realized.

In the embodiment, a 285 monocrystalline silicon battery assembly is adopted, a string of 22 modules is used as several basic units, 10-12 series inverters are connected into 1 60kW string, 3-4 inverters are connected into 1 alternating current combiner box, 2 combiner boxes are connected into 400V grid-connected points in a factory area, the number of the grid-connected points of a color steel tile roof and a photovoltaic shed is 18, and the grid-connected points are up to the full capacity at present.

The cement roof photovoltaic part adopts the guide plate support technology, and compared with the traditional concrete photovoltaic support foundation, the concrete photovoltaic support foundation has the obvious advantages of attractive appearance, small load, no damage to a roof structure and water resistance, strong structural corrosion resistance, convenience in installation, short construction period, high modularization and the like.

The guide plate mounting system is suitable for outdoor or plane roofs, and has the outstanding advantage of meeting plane roofs with small load capacity. The system is convenient to install, the stainless steel supporting piece is installed on the aluminum guide rail, the guide plates are installed on two sides and the back of the whole frame, and the system can be firmly fixed on a roof by the pressure generated by air flow under the condition of extremely high wind load and cannot be lifted.

The photovoltaic bicycle shed upper structure adopts a guide rail form for installation, reduces the installation problem caused by accumulation of small errors of the foundation and the support part, and has the characteristics of attractiveness and orderliness.

3. Charging pile unit 3

Charging pile unit 3 is arranged in place in the parking shed for electric automobile charges in this embodiment, plans to dispose 4 sets of 60kW single gun type direct current charging piles and 6 sets of 7kW floor type alternating current charging piles to near access of 380V voltage level is to the electricity distribution room. The power grade of wall-hanging/floor type is 7kW for alternating current, and a single-gun type of 60kW is used for a direct current charging pile.

The electrical loads in the park mainly comprise factory electrical loads, office lighting electrical loads, charging pile loads and the like. The cold/heat load in the garden mainly meets the production and living requirements of the garden.

4. Source and load centralized monitoring unit 1

The dispatching management mode of the power station directly accepts dispatching. The project is designed according to the principle of little person on duty. The power station adopts a monitoring mode based on a computer monitoring system. The computer monitoring system should be able to satisfy all design functions required for the monitoring and control of the safe operation of the total station.

The computer monitoring system includes: the system comprises a station control layer, a network layer and an interval layer, wherein the network structure is an open layering and distributed structure, the station control layer is a center for monitoring, measuring, controlling and managing the total station equipment, and the station control layer is connected with the interval layer through an optical cable or a shielded twisted pair. The bay level is respectively arranged in the corresponding switch cabinets 43 according to different voltage levels and electrical isolation units, and the bay level can still independently complete the functions of bay level monitoring and breaker control under the condition that the station control level and the network fail. The computer monitoring system is communicated with the dispatching center through the telecontrol workstation. The four-remote function is completed by an electric monitoring (with remote function) system of the boosting transformer substation.

The main equipment of the station control layer comprises a host, an operator station, a telecontrol workstation, an engineer station, a printer and a GPS time synchronization device;

the network layer main equipment comprises network equipment, a protocol conversion interface and the like;

the main equipment of the bay level comprises a protection measurement and control unit.

The computer monitoring system is not provided with an independent grounding network, and adopts a single-point grounding mode of the grounding network shared with the power grid centralized control station.

The energy storage part on-site monitoring system consists of a BAMS system of an energy storage battery, a PCS communication control module and a box transformer substation 23 measurement and control module, and achieves functions of monitoring relevant states of the energy storage battery, the PCS and the box transformer substation 23, collecting data, maintaining and inquiring a historical database and the like. The battery BAMS has the functions of detection and calculation, battery cell balance management, high-voltage management, statistical storage, charge and discharge management and alarm communication. The energy storage PCS is provided with direct current overvoltage protection, alternating current overvoltage protection, polarity reverse connection protection, insulation monitoring and module temperature protection. And the local monitoring system transmits the information to the background coordination controller, and an operation strategy is formulated according to the working conditions.

The photovoltaic part local monitoring system collects real-time data of the string inverters through the communication management machine, then transmits the data to the computer monitoring system, and the data are uniformly operated and managed by the background.

As shown in fig. 2, in the present embodiment, the station control layer includes a host 11, a client host 12, a printer 13, and a communication manager 14, information such as the converter 22, the grid-connected inverter 42, the box transformer 23, the cooling, heating, and power load 6, and the lithium iron phosphate battery 21 is sent to the switch 16 through an IEC 104 protocol, the switch 16 is in communication connection with the host 11, the client host 12, and the communication manager 14, the client host 12 is connected with the printer 13, and the communication manager 14 is used for connecting with an external control system 15.

The master machine of the station control layer is an EMS energy management system, and after the EMS energy management system receives the information, the source-storage-load in the park is uniformly coordinated, controlled and optimized through the hybrid energy system coordination control strategy provided by the embodiment, so that the optimized economic operation of the park is realized. The EMS host comprises the following main functions: real-time data analysis, data storage, fault recording and analysis, historical data query, data display, manual intervention, operation mode control, automatic conversion and the like. And 2 sets of necessary communication and protocol conversion equipment are used for realizing reliable communication with the AB network of the 110kV station monitoring system.

The foregoing has described in detail preferred embodiments of the present invention. It should be understood that numerous modifications and variations can be devised by those skilled in the art in light of the teachings of the present invention without undue experimentation. Therefore, the technical solutions that can be obtained by a person skilled in the art through logic analysis, reasoning or limited experiments based on the prior art according to the concepts of the present invention should be within the scope of protection defined by the claims.

Claims (10)

1. A source and load storage hybrid energy system of a commercial park is characterized by comprising a lithium iron phosphate battery energy storage unit (2), a distributed photovoltaic unit (4), a charging pile unit (3), a power distribution network (5) and a source and load storage centralized monitoring unit (1), wherein the power distribution network (5) is respectively connected with the lithium iron phosphate battery energy storage unit (2), the distributed photovoltaic unit (4) and the charging pile unit (3);

the source and load centralized monitoring unit (1) is respectively connected with the lithium iron phosphate battery energy storage unit (2), the distributed photovoltaic unit (4) and the charging pile unit (3);

the lithium iron phosphate battery energy storage unit (2), the distributed photovoltaic unit (4) and the charging pile unit (3) are all arranged in a commercial park.

2. The source-storage-and-charge hybrid energy system of a commercial park according to claim 1, characterized in that the lithium iron phosphate battery energy storage unit (2) employs a square aluminum shell 37Ah cell.

3. The source-storage-and-charge hybrid energy system of a commercial park according to claim 1, characterized in that the lithium iron phosphate battery energy storage unit (2) comprises a lithium iron phosphate battery (21), an energy storage converter (22) and a box transformer substation (23) which are connected in sequence, and the box transformer substation (23) is connected with the power distribution network (5).

4. A source-stored hybrid energy system for a commercial park according to claim 3, characterized in that the energy storage converter (22) is a bidirectional converter.

5. A source-stored hybrid energy system of a commercial park according to claim 3, characterized in that the tank transformer (23) is a double split transformer.

6. A source-stored hybrid energy system for a commercial park according to claim 1, characterized in that the distributed photovoltaic unit (4) comprises a polysilicon photovoltaic module (41), a grid-connected inverter (42) and a switchgear cabinet (43) connected in sequence, the switchgear cabinet (43) being connected to the distribution grid (5).

7. The source-stored hybrid energy system of a commercial park according to claim 6, characterized in that the polycrystalline silicon photovoltaic modules (41) are polycrystalline silicon photovoltaic modules with anti-PID attenuation function.

8. The source-stored hybrid energy system of a commercial park according to claim 6, characterized in that the grid-connected inverter (42) is connected to the switchgear cabinet (43) via an AC return tank.

9. The source-storage-and-charge hybrid energy system of the commercial park as claimed in claim 1, wherein the source-storage-and-charge centralized monitoring unit (1) comprises a computer monitoring subunit, an energy storage monitoring subunit and a photovoltaic monitoring subunit, the energy storage monitoring subunit comprises an energy storage converter (22), a BAMS battery stack management system and a box transformer substation (23) in a lithium iron phosphate battery energy storage unit (2), the energy storage converter (22), the BAMS battery stack management system and the box transformer substation (23) are all connected with the computer monitoring subunit, the photovoltaic monitoring subunit comprises a communication manager and a grid-connected inverter (42) in a distributed photovoltaic unit (4), and the computer monitoring subunit is connected with the grid-connected inverter (42) through the communication manager.

10. The source-stored hybrid energy system of a commercial park according to claim 9, wherein the computer monitoring sub-unit comprises a station control layer including a host, an operator station, a telemechanical workstation and/or an engineer station, a network layer including an optical cable or a shielded twisted pair, and a bay layer including electrical isolation units disposed in the respective switchgears (43), the host, the operator station, the telemechanical workstation and the engineer station connecting the electrical isolation units disposed in the respective switchgears (43) through the optical cable or the shielded twisted pair; the energy storage converter (22), the BAMS battery stack management system and the box transformer substation (23) are all connected with the host, the operator station, the telecontrol workstation and the engineer station.

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