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

Abstract

The utility model relates to a source-storage-load hybrid energy system in a business park, comprising a lithium iron phosphate battery energy storage unit, a distributed photovoltaic unit, a charging pile unit, a distribution network and a source-storage-load centralized monitoring unit. The lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit and the charging pile unit are respectively connected; the source storage and load centralized monitoring unit is respectively connected to the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit connection and the charging pile unit ; The lithium iron phosphate battery energy storage unit, distributed photovoltaic unit and charging pile unit are all arranged in the business park. Compared with the prior art, the utility model has the advantages of safety and reliability, high power generation efficiency, energy saving and environmental protection.

Description

A source-storage-load hybrid energy system in a business park

technical field

The utility model relates to the field of mixed energy in commercial parks, in particular to a source-storage-load mixed energy system in commercial parks.

Background technique

my country's energy development is entering a new stage of transition from total volume expansion to quality and efficiency improvement. Building a clean and low-carbon energy supply system and creating a new situation of safe and efficient energy consumption will become the direction and goal of my country's energy development. The source-storage-load hybrid energy system of the commercial park combined with renewable energy is conducive to improving the comprehensive utilization rate of energy and realizing the optimal allocation of energy.

Most of the current source-storage-load hybrid energy systems in business parks focus on coordinated control planning with various energy sources, monitoring the structure of the source-storage-load hybrid energy system itself in the business park and the monitoring of various components of the source-storage-load hybrid energy system. There is still much room for improvement.

Utility model content

The purpose of the present utility model is to provide a stable, reliable and comprehensive monitoring and control source-storage-load hybrid energy system in a commercial park in order to overcome the above-mentioned defects of the prior art.

The purpose of the present utility model can be achieved through the following technical solutions:

A source-storage-load hybrid energy system in a business park, comprising a lithium iron phosphate battery energy storage unit, a distributed photovoltaic unit, a charging pile unit, a distribution network, and a source-storage-load centralized monitoring unit, wherein the distribution network is respectively connected to the LiFePO4 battery energy storage unit, distributed photovoltaic unit and charging pile unit;

The source-storage-load centralized monitoring unit is respectively connected to the lithium iron phosphate battery energy storage unit, the distributed photovoltaic unit connection and the charging pile unit;

The lithium iron phosphate battery energy storage unit, distributed photovoltaic unit and charging pile unit are all set in the business park.

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

Further, the lithium iron phosphate battery energy storage unit includes a lithium iron phosphate battery, an energy storage converter and a box transformer connected in sequence, and the box transformer is connected to the power distribution network.

Further, the energy storage converter is a bidirectional converter.

Further, the box becomes a double split transformer.

Further, the distributed photovoltaic unit includes a polycrystalline silicon photovoltaic module, a grid-connected inverter and a switch cabinet connected in sequence, and the switch cabinet is connected to the power distribution network.

Further, the polycrystalline silicon photovoltaic module is a polycrystalline silicon photovoltaic module with anti-PID attenuation function.

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

Further, the source storage and load centralized monitoring unit includes a computer monitoring subunit, an energy storage monitoring subunit and a photovoltaic monitoring subunit, and the energy storage monitoring subunit includes an energy storage converter in the lithium iron phosphate battery energy storage unit. , BAMS battery stack management system and box transformer, the energy storage converter, BAMS battery stack management system and box transformer are all connected to the computer monitoring sub-unit, and the photovoltaic monitoring sub-unit includes a communication management machine and a distributed photovoltaic unit In the grid-connected inverter, the computer monitoring sub-unit is connected to the grid-connected inverter through a communication management machine.

Further, the computer monitoring sub-unit includes a station control layer, a network layer and a bay layer, the station control layer includes a host computer, an operator station, a telecontrol workstation and/or an engineer station, and the network layer includes an optical cable or a shielded double layer. Twisted wires, the interval layer includes electrical isolation units arranged in each switch cabinet, and the host, operator station, telecontrol workstation and engineer station are connected to the electrical appliances arranged in each switch cabinet through optical cables or shielded twisted pair wires. Isolation unit; the energy storage converter, the BAMS battery stack management system and the box transformer are all connected to the host, operator station, telecontrol workstation and engineer station.

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

(1) The source-storage-load hybrid energy system of the present utility model is equipped with distributed photovoltaic units, and the renewable energy-light energy is introduced into the source-storage-load hybrid energy system of the commercial park, which is beneficial to improve the comprehensive utilization rate of energy, save energy and protect the environment. To achieve the optimal allocation of energy.

(2) The utility model adopts the lithium iron phosphate battery energy storage unit, and selects the square aluminum shell 37Ah electric core, which has the advantages of long service life, advanced reliability and environmental friendliness.

(3) The distributed photovoltaic unit of the present invention adopts polysilicon photovoltaic modules, which have many power specifications and are widely used in products, which meet the configuration requirements of the source-storage hybrid energy system of the present invention, and the parameters are excellent, which can improve the The power generation performance of the entire distributed photovoltaic unit.

(4) The utility model takes into account the influence of the PID effect of the photovoltaic component on the photovoltaic component, which will cause the power output attenuation of the component to decay, so the anti-PID attenuation photovoltaic component is used to improve the stability of the source-storage hybrid energy system of the present utility model. and reliability.

(5) The computer monitoring subunit of the present utility model comprises a station control layer, a network layer and an interval layer, the station control layer is the center of monitoring, measurement, control and management of the total station equipment, and the interval layer is based on different voltage levels and electrical isolation units, They are respectively arranged in the corresponding switch cabinets. In the case of failure of the station control layer and the network, the interval layer can still independently complete the monitoring and circuit breaker control functions of the interval layer, thereby improving the reliability of the control of the source-storage hybrid energy system of the present invention. .

Description of drawings

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

2 is a schematic diagram of the connection circuit of the central monitoring unit for source storage and load of the present invention;

In the figure, 1. Centralized monitoring unit for source storage and load, 11, host, 12, client host, 13, printer, 14, communication management machine, 15, external control system, 16, switch, 2, lithium iron phosphate battery energy storage Unit, 21, Lithium Iron Phosphate Battery, 22, Energy Storage Converter, 23, Box Transformer, 3, Charging Pile Unit, 4, Distributed Photovoltaic Unit, 41, Polycrystalline Silicon Photovoltaic Module, 42, Grid-connected Inverter, 43 , Switchgear, 5, Distribution network, 6, Cooling and heating load.

Detailed ways

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

Example 1

As shown in FIG. 1, this embodiment provides a source-storage-load hybrid energy system in a business park, including 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 unit. The centralized load monitoring unit 1 and the distribution network 5 are respectively connected to the lithium iron phosphate battery energy storage unit 2, the distributed photovoltaic unit 4 and the charging pile unit 3;

The source-storage-load centralized monitoring unit 1 is respectively connected to the lithium iron phosphate battery energy storage unit 2, the distributed photovoltaic unit 4 is connected to 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 set in the business park.

Each part is described in detail below.

1. Lithium iron phosphate battery energy storage unit 2

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

101) Selection of energy storage battery

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

Table 1 37Ah cell parameter table

102) Energy storage unit access scheme

In this embodiment, the lithium iron phosphate battery energy storage unit 2 is to be configured with a capacity of 3.5MW/12.5MWh, which is defined as a medium-sized electrochemical energy storage power station according to the "GB51048-2018 Design Specification for Electrochemical Energy Storage Power Stations". According to the "Q/GDW564-2010 Technical Regulations for Energy Storage System Access to Distribution Network", energy storage systems above 200kW should be connected to distribution networks with voltage levels of 10kV (6kV) and above. The energy storage unit of the embodiment is connected to the distribution network 5 by 2 circuits of 10kV cable collection lines to the 10kV power distribution device room of the 110kV substation in the factory area.

103) Electrical main wiring of energy storage unit

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

In this embodiment, the energy storage unit is connected to the power grid at 10 kV in two rounds. The energy storage converter 22 adopts a 500kW bidirectional converter, the lithium iron phosphate battery energy storage unit 2 is boosted to 10kV through a 2500kVA and a 1000kVA double-split transformer respectively, and the box transformer 23 is collected and sent to the factory area through a 10kV collector line The 10kV power distribution device room of the 110kV substation is connected to the power grid. This example uses a 2500kVA box-type transformer 23, the model is SCB11-2500kVA/10, 10.5kV±2*2.5%/0.315kV, and a 1000kVA box-type transformer 23, the model is SCB11-1000kVA/10, 10.5kV± 2*2.5%/0.315kV.

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

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

The energy storage unit in the demonstration park of this embodiment is a complete set of pre-installed energy storage equipment (including: high integration of storage battery, battery cabinet, DC power distribution cabinet, energy storage converter 22, and AC power distribution equipment), boost power distribution system and energy management system.

After the batteries are assembled in series and parallel in the battery cabinet, the DC power distribution cabinet is combined and input to the energy storage converter 22, and the energy storage converter 22 is output to the AC power distribution cabinet after boosting and then connected to the 10kV side of the 110kV substation in the region.

Considering the performance parameters, service life, later maintenance difficulty, and technical maturity of the battery, as well as factors such as site area and initial investment cost, this embodiment uses a lithium iron phosphate battery 21 .

In this embodiment, all 22 sets of energy storage systems will be installed in a 40-foot container (outer dimension: length 12.192m×2.438m×2.591m). Including: 17 sets of 500kW/1.793MWh (19.5Ah cell) energy storage containers, 3 sets of 500kW/1.944MWh (37Ah) energy storage containers, each set of containers is equipped with complete power supply, temperature control, fire protection and other facilities. This method has the characteristics of low cost, simple installation and debugging, low construction difficulty, and convenient expansion.

Table 2 Main parameters of energy storage converter PCS

2. Distributed photovoltaic unit 4

The distributed photovoltaic unit 4 includes photovoltaic modules, a grid-connected inverter 42 and a switch cabinet 43 connected in sequence, and the switch cabinet 43 is connected to the power distribution network 5 .

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

201) 5 schemes for access to distribution network

The total installed capacity of distributed photovoltaic units 4 in this embodiment is about 6282.54kWp, and the mode of "self-generated and self-used, surplus power is connected to the Internet" is adopted, and many factors such as the geographical location of the park, the current status of power system resources, technical feasibility, and economical efficiency are comprehensively considered. The photovoltaic system in the park is planned and designed with 18 photovoltaic sub-array units, and a total of 18 400V low-voltage grid connection points are set up. Among them, the new grid-connected switch cabinets with 434 sides in the power distribution room of the component capacity workshop in the park are 1#~4# grid-connected points, and the 435-side new grid-connected switch cabinets in the power distribution room of the assembly workshop are 5#~9# grid-connected points. In the power distribution room on the west side of the slurry electrode workshop, the newly added grid-connected switch cabinets with 432 sides are 10#~11# grid connection points, and the 432 sides of the newly added grid-connected switch cabinets in the power station power distribution room are 12#~13# grid connection points, and slurry electrodes The newly added grid-connected switch cabinet 433 in the power distribution room on the east side of the workshop is the 14#~16# grid connection point, and the 432 side of the newly added grid-connected switch cabinet in the power distribution room of the office building is the 17#~18# grid connection point. The incoming and outgoing lines in the cabinet are in the form of bottom-in and top-out, and are connected in parallel with the original distribution low-voltage switch cabinet 43 through the busbar.

The specific access capacity of a single grid-connected point is shown in Table 3 below.

202) Electrical main wiring scheme

Photovoltaic modules are mainly arranged in slurry electrode workshop, assembly workshop, chemical composition workshop, raw material three-dimensional warehouse, finished product warehouse, office building, restaurant roof and parking lot shed. It adopts single crystal 285Wp components and 60kW string inverter configuration. The output voltage of each inverter is 380V three-phase AC power. After being collected by the AC combiner box, it is merged into 18 grid connection points under the low-voltage system of the factory area, and finally the voltage of 400V is used. Level access to the grid. The location of the access point of each photovoltaic power generation unit is as follows:

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

The photovoltaic power generation unit in the assembly workshop is connected to the assembly workshop, office building, and power station power distribution room;

A photovoltaic power generation unit in the chemical composition workshop is connected to the power station power distribution room;

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

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

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

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

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

Table 3 Access capacity of a single grid connection point

203) Selection of main equipment

The distributed photovoltaic unit 4 includes photovoltaic modules, a grid-connected inverter 42 and a switch cabinet 43 connected in sequence, and the switch cabinet 43 is connected to the power distribution network 5 .

21. Photovoltaic modules

Photovoltaic modules are the core components of photovoltaic power generation systems, and the quality of their parameters directly affects the power generation performance of the entire photovoltaic power generation system. Various parameters of PV module performance mainly include: module peak power, peak current, peak voltage, short-circuit current, open-circuit voltage, maximum system voltage, module efficiency, short-circuit current temperature coefficient, open-circuit voltage temperature coefficient, peak power temperature under standard test conditions coefficients, etc. The polycrystalline silicon photovoltaic modules 41 have many power specifications, and the products are widely used. Through market research, domestic mainstream manufacturers produce polycrystalline silicon photovoltaic modules 41 for photovoltaic power generation systems, and most of their specifications are between 150Wp and 300Wp. Within this range, the module efficiency, technology maturity and availability when purchasing and ordering are considered Choice. Therefore, in this embodiment, the specification of the polycrystalline silicon photovoltaic module 41 is 285Wp.

The technical parameters of the polycrystalline silicon photovoltaic module 41 are shown in Table 4.

Table 4 Technical Parameters of Photovoltaic Modules

The PID effect of photovoltaic modules is a frequent attenuation effect in the photovoltaic field in recent years. With the increase of the applied voltage of the photovoltaic system, there is also a high voltage between the module and the frame. This high voltage will excite leakage current between the module and the frame, and the power output of the module will be attenuated. The photovoltaic modules provided by this project shall adopt anti-PID attenuation photovoltaic modules.

22. Grid-connected inverter 42

The inverter selection mainly compares the following indicators.

The range of the inverter input DC voltage: Since the output voltage of the solar cell string is affected by the intensity of sunlight, weather conditions and load, its variation range is relatively large. It is required that the inverter can work normally within a large DC input voltage range and ensure that the AC output voltage is stable.

Inverter output efficiency: When the high-power inverter is fully loaded, the efficiency must be above 95% to 98%. The efficiency of small and medium power inverters must be above 90% when fully loaded. Even when the rated power of the inverter is 10%, the conversion efficiency of more than 90% (high-power inverter) must be guaranteed.

Inverter output waveform: In order to make the DC power generated by the photovoltaic array invert and supply power to the public grid, the output voltage waveform, amplitude, phase and frequency of the inverter are required to be consistent with the public grid, so as to realize the power supply to the public grid. The grid can supply power smoothly without disturbance. The selected inverter should have a good output current waveform, and the waveform distortion and frequency fluctuation should be lower than the national standard requirements.

Maximum power point tracking: The input terminal impedance of the inverter should be adapted to the actual operating characteristics of the photovoltaic power generation system. Ensure 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: in the case of overvoltage, the photovoltaic power generation system should operate normally; The inverter needs to automatically adjust the operating point in the direction of the open-circuit voltage in the photovoltaic cell characteristic curve to limit the input power within a given range; in the event of a fault, the inverter must automatically disconnect from the main grid.

Monitoring and data collection: The inverter should have various communication interfaces to collect data and send it to the central control room. The monitoring equipment should also have analog input ports to connect with external sensors to measure data such as sunshine and temperature.

The main technical indicators of the inverter are: rated capacity, output power factor, rated input voltage, current, voltage regulation rate, total harmonic distortion rate, etc.

The specific technical parameters of the grid-connected inverter 42 in this project are shown in Table 5 below.

Table 5 Main technical parameters of 60kW string inverter

2.3. Switchgear 43

Photovoltaic power generation is connected to the 400V standby switch cabinet in the slurry motor workshop, office building, assembly workshop, and power station power distribution room directly or through the AC combiner box, and finally connected to the power grid at the 400V voltage level. Utilize the 400V standby switch cabinet in the original power distribution room, no need to add new ones.

204) The specific structure of the distributed photovoltaic unit 4

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

It adopts single crystal 285Wp components and 60kW string inverter configuration. The output voltage of each inverter is 380V three-phase AC power. After being collected by the AC combiner box, it is merged into 18 grid connection points under the 380V low-voltage system in the factory area, with a total installed capacity of 6.28MWp. , to realize the mode of "spontaneous self-use, and the surplus electricity is connected to the Internet".

In this example, 285 monocrystalline silicon battery modules are used, a string of 22 modules is used as several basic units, 10 to 12 strings are connected to a 60kW string inverter, and 3 to 4 inverters are connected to an AC inverter Combiner box, 2 combiner boxes are connected to the 400V grid connection point in the factory area, and there are 18 grid connection points on the color steel tile roof and photovoltaic carport, which have been fully connected to the grid so far.

The photovoltaic part of the cement roof adopts the deflector support technology. Compared with the traditional concrete photovoltaic support foundation, it has the advantages of beautiful appearance, less load, no damage to the roof structure, no damage to waterproof, strong structural anti-corrosion ability, easy installation, short construction period, and high modularity. and other obvious advantages.

The deflector mounting system is suitable for outdoor or flat roofs, and its outstanding advantage is that it can meet the flat roof with less load. The system is easy to install. Stainless steel supports are installed on the aluminum guide rails, and deflectors are installed on both sides and behind the frame. In the case of extremely high wind loads, the system can also be firmly fixed on the roof by the pressure generated by the air flow. to be lifted.

The upper structure of the photovoltaic carport in this embodiment is installed in the form of guide rails, which reduces the installation problems caused by the accumulation of small errors in the foundation and bracket parts, and has the characteristics of beauty and neatness.

3. Charging pile unit 3

In this embodiment, the charging pile unit 3 is arranged in the parking shed on the spot to charge the electric vehicle. It is planned to configure 4 sets of 60kW single-gun DC charging piles and 6 sets of 7kW floor-type AC charging piles, which are connected to the nearby equipment at a voltage level of 380V. Electric room. Among them, the AC adopts wall-mounted / floor-standing power rating of 7kW, and the DC charging pile adopts 60kW single-gun type.

The electrical load in the park mainly includes the electrical load of production plants, the electrical load of office lighting and the load of charging piles. The cooling/heating load in the park is mainly to meet the production and living needs of the park.

4. Source-storage-load centralized monitoring unit 1

The dispatching management method of the power station directly accepts the ground dispatching. This project is designed according to the principle of few people on duty. The power station adopts the monitoring method based on the computer monitoring system. The computer monitoring system should be able to meet all the design functions required for the monitoring and control of the safe operation of the whole station.

The computer monitoring system includes: station control layer, network layer and interval layer. The network structure is an open layered and distributed structure. The station control layer is the center of the monitoring, measurement, control and management of the total station equipment. The wires are connected to the spacer layer. The bay floors are respectively arranged in the corresponding switch cabinets 43 according to different voltage levels and electrical isolation units. In the event of station control floor and network failure, the bay floor can still independently complete the monitoring and circuit breaker control functions of the bay floor. The computer monitoring system communicates with the dispatch center through the telecontrol workstation. The "four remote" function is completed by the electrical monitoring (with telecontrol function) system of the booster substation.

The main equipment of the station control layer includes the host computer, operator station, telecontrol workstation, engineer station, printer, and GPS timing device;

The main equipment of the network layer includes network equipment and protocol conversion interfaces;

The main equipment of the bay layer includes the protection measurement and control unit.

The computer monitoring system does not have a separate grounding grid, and adopts the single-point grounding method of the grounding grid shared with the power grid centralized control station.

The on-site monitoring system of the energy storage part is composed of the BAMS system of the energy storage battery, the PCS communication control module, and the measurement and control of the box transformer 23. It completes the state monitoring, data acquisition, and historical database maintenance and query related to the energy storage battery, PCS, and box transformer 23. Function. The battery BAMS has detection and calculation functions, battery cell balance management functions, high voltage management functions, statistical storage functions, charge and discharge management functions, and alarm communication functions. The energy storage PCS is equipped with DC overvoltage protection, AC overvoltage protection, reverse polarity protection, insulation monitoring, and module temperature protection. The on-site monitoring system transmits the information to the background coordination controller, and formulates the operation strategy according to the working conditions.

The on-site monitoring system of the photovoltaic part collects the real-time data of the string inverters through the communication management machine, and then transmits it to the computer monitoring system for unified operation and management in the background.

As shown in FIG. 2 , in this embodiment, the station control layer includes a host 11 , a client host 12 , a printer 13 , a communication management machine 14 , a converter 22 , a grid-connected inverter 42 , a box transformer 23 , and a cooling, heating and electrical load. 6. Information such as lithium iron phosphate battery 21 is sent to the switch 16 through the IEC 104 protocol. The switch 16 communicates with the host 11, the client host 12 and the communication management machine 14. The client host 12 is connected to the printer 13, and the communication management machine 14 is used for An external control system 15 is connected.

The host at the station control layer is the EMS energy management system. After receiving the information at the station control layer, the EMS energy management system performs unified coordinated control of the source-storage-load in the park through the coordinated control strategy of the hybrid energy system proposed in this embodiment. and optimization to realize the optimal economic operation of the park. The main functions of the EMS host include: real-time data analysis, data storage, fault recording and analysis, historical data query, data display, manual intervention, operation mode control and automatic conversion, etc. There are 2 sets of necessary communication and protocol conversion equipment to meet the reliable communication with the AB network of the 110kV station monitoring system.

The preferred embodiments of the present invention have been described in detail above. It should be understood that those skilled in the art can make many modifications and changes according to the concept of the present invention without creative efforts. Therefore, any technical solutions that can be obtained by those skilled in the art through logical analysis, reasoning or limited experiments on the basis of the prior art according to the concept of the present invention shall fall within the protection scope determined by the claims. .

Claims (10)

1. A source-storage-load hybrid energy system in a business park, characterized in that it comprises 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-load centralized monitoring unit (1), the distribution network (5) is respectively connected to the lithium iron phosphate battery energy storage unit (2), the distributed photovoltaic unit (4) and the charging pile unit (3); The source-storage-load centralized monitoring unit (1) is respectively connected to 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 business park. 2 . The source-storage-charge hybrid energy system of a business park according to claim 1 , wherein the lithium iron phosphate battery energy storage unit ( 2 ) adopts a square aluminum shell 37Ah cell. 3 . 3. The source-storage-load hybrid energy system of a business park according to claim 1, wherein the lithium iron phosphate battery energy storage unit (2) comprises a lithium iron phosphate battery (21), a storage An energy converter (22) and a box transformer (23), wherein the box transformer (23) is connected to the power distribution network (5). 4. A source-storage-load hybrid energy system in a business park according to claim 3, wherein the energy storage converter (22) is a bidirectional converter. 5 . The source-storage-load hybrid energy system of a business park according to claim 3 , wherein the box transformer ( 23 ) is a double-split transformer. 6 . 6. A source-storage-load hybrid energy system in a business park according to claim 1, wherein the distributed photovoltaic unit (4) comprises polycrystalline silicon photovoltaic modules (41), grid-connected inverters connected in sequence (42) and a switch cabinet (43), wherein the switch cabinet (43) is connected to the power distribution network (5). 7 . The source-storage-load hybrid energy system of a business park according to claim 6 , wherein the polycrystalline silicon photovoltaic module ( 41 ) is a polycrystalline silicon photovoltaic module with anti-PID attenuation function. 8 . 8. The source-storage-load hybrid energy system of a business park according to claim 6, wherein the grid-connected inverter (42) is connected to the switch cabinet (43) through an AC return box. 9 . The source-storage-load hybrid energy system according to claim 1 , wherein the source-storage-load centralized monitoring unit (1) comprises a computer monitoring subunit, an energy storage monitoring subunit, and a photovoltaic monitoring unit. 10 . a subunit, the energy storage monitoring subunit comprises an energy storage converter (22), a BAMS battery stack management system and a box transformer (23) in the lithium iron phosphate battery energy storage unit (2), the energy storage converter (23) The controller (22), the BAMS battery stack management system and the box transformer (23) are all connected to the computer monitoring sub-unit, and the photovoltaic monitoring sub-unit includes a communication management machine and a grid-connected inverter in the distributed photovoltaic unit (4). (42), the computer monitoring sub-unit is connected to the grid-connected inverter (42) through a communication management machine. 10. The source-storage-load hybrid energy system of a business park according to claim 9, wherein the computer monitoring sub-unit comprises a station control layer, a network layer and an interval layer, and the station control layer comprises a host, a An operator station, a telecontrol station and/or an engineer station, the network layer includes optical cables or shielded twisted pairs, the space layer includes electrical isolation units arranged in each switch cabinet (43), the host, operator The station, the telecontrol station and the engineer station are connected to the electrical isolation units arranged in each switch cabinet (43) through optical cables or shielded twisted pairs; the energy storage converter (22), the BAMS battery stack management system and the box transformer (23) All are connected to the host, operator station, telecontrol workstation and engineer station.

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