CN112713520A - Off-grid wind-solar energy storage intelligent power supply system - Google Patents
Off-grid wind-solar energy storage intelligent power supply system Download PDFInfo
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02B—BOARDS, SUBSTATIONS OR SWITCHING ARRANGEMENTS FOR THE SUPPLY OR DISTRIBUTION OF ELECTRIC POWER
- H02B1/00—Frameworks, boards, panels, desks, casings; Details of substations or switching arrangements
- H02B1/26—Casings; Parts thereof or accessories therefor
- H02B1/30—Cabinet-type casings; Parts thereof or accessories therefor
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J13/00—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network
- H02J13/00006—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment
- H02J13/00022—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission
- H02J13/00026—Circuit arrangements for providing remote indication of network conditions, e.g. an instantaneous record of the open or closed condition of each circuitbreaker in the network; Circuit arrangements for providing remote control of switching means in a power distribution network, e.g. switching in and out of current consumers by using a pulse code signal carried by the network characterised by information or instructions transport means between the monitoring, controlling or managing units and monitored, controlled or operated power network element or electrical equipment using wireless data transmission involving a local wireless network, e.g. Wi-Fi, ZigBee or Bluetooth
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J7/00—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries
- H02J7/0013—Circuit arrangements for charging or depolarising batteries or for supplying loads from batteries acting upon several batteries simultaneously or sequentially
- H02J7/0014—Circuits for equalisation of charge between batteries
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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- Engineering & Computer Science (AREA)
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Abstract
The invention relates to the technical field of power supply systems, in particular to an off-grid wind-solar storage intelligent power supply system. This off-grid scene stores up intelligent power supply system includes: an integrated cabinet body; and the integrated cabinet body is provided with a hybrid converter unit (PCS), an alternating current-direct current Power Distribution Unit (PDU), an Energy Management Unit (EMU), a lithium ion battery energy storage unit and a battery management unit in an integrated mode. The invention adopts two new energy power generation mechanisms of photovoltaic and wind power and a lithium ion battery energy storage module, and realizes the automatic power supply capability of day and night time period full coverage under the control of an intelligent EMS energy management system. Compared with the existing traditional photovoltaic power supply or wind power supply system, the system adopts a lithium ion battery with deep charging and discharging and long cycle life to replace the traditional lead-acid battery for power storage, introduces an intelligent EMS energy management system to perform real-time management and control and analysis on the power generation power supply condition and the power load condition, makes a corresponding reasonable management and control strategy, and forms the automatic operation effect of the complete system.
Description
Technical Field
The invention relates to the technical field of power supply systems, in particular to an off-grid wind-solar storage intelligent power supply system.
Background
At present, local power generation systems such as diesel generator sets, small hydroelectric generators, photovoltaic power generation systems, wind power generators and the like are generally adopted for power supply in areas without electricity and in areas without electricity. The diesel generator set drives the generator to generate electricity by consuming diesel, and the diesel generator set has the obvious characteristics of being used immediately after generating and convenient to carry and transfer. The power generation system of water conservancy, light energy and wind power and the like fully utilizes resources such as geographical environment, renewable energy and the like to generate power, does not need continuous fuel consumption and is environment-friendly. These local power generation systems are usually installed nearby at locations around the electric loads, and there is no need to invest in high-power thermal power plants and power transmission and distribution facilities, and a relatively effective solution is provided for power supply in areas without electricity and in short of electricity.
The disadvantages of the prior art are as follows:
(1) diesel power generation systems are accompanied by the following disadvantages: the power generation system needs continuous fuel consumption, and the related problems of fuel cost, storage and transportation cost, labor cost, fuel danger and the like are difficult to avoid; the natural environment and the health of personnel are influenced along with environmental pollution and noise in the power generation process, and the development idea of green energy is not met; the continuous power utilization requirement of the load puts a severe requirement on the stability of the long-time operation of the diesel generating set.
(2) The renewable energy power generation system is obviously influenced by the geographical environment and the climate environment. Hydroelectric power generation is limited by water vein landforms, and energy efficiency is difficult to exert in areas with water shortage and insufficient water level fall; the photovoltaic power generation is only used in the daytime, and the load cannot be supplied with power at night; wind power generation is obviously affected by terrain, and the effective power generation function cannot be carried out in weak wind regions.
In addition to the respective problems associated with the above several types of power generation systems, another common disadvantage is the low level of intelligent operation of the power generation systems. Due to the lack of a corresponding intelligent control system, the power generation state of a power supply end and the power utilization condition of a load end lack of recording and management, and effective monitoring and management capabilities cannot be realized, so that the manual operation and maintenance cost is high, a real-time supervision mechanism of the system operation state is lost, and the long-term stability of a power generation and power supply system is not facilitated.
The information disclosed in this background section is only for enhancement of understanding of the general background of the invention and should not be taken as an acknowledgement or any form of suggestion that this information forms the prior art already known to a person skilled in the art.
Disclosure of Invention
The invention aims to provide an off-grid wind-solar energy storage intelligent power supply system to solve the technical problems in the prior art.
In order to achieve the purpose, the invention adopts the following technical scheme:
the invention provides an off-grid wind-solar energy storage intelligent power supply system, which comprises: an integrated cabinet body; and the integrated cabinet body is provided with a hybrid converter unit (PCS), an alternating current-direct current Power Distribution Unit (PDU), an Energy Management Unit (EMU), a lithium ion battery energy storage unit and a battery management unit in an integrated mode.
As a further technical solution, the hybrid converter unit is used for dc/dc and dc/ac power conversion related to a photovoltaic system, a wind power system, and a lithium ion battery energy storage unit.
As a further technical scheme, the alternating current/direct current power distribution unit is used for distributing power to a photovoltaic system, power input of a wind power system, input and output of a lithium ion battery energy storage unit, load power consumption energy output and power consumption inside the system.
As a further technical scheme, the energy management unit is used for collecting and analyzing current and voltage signals of a photovoltaic system and a wind power system, state parameters of a lithium battery energy storage unit and power utilization state parameters of a power utilization load end, and real-time feedback control of the system is carried out through built-in logic operation.
As a further technical solution, the energy storage unit of the lithium ion battery adopts a ternary lithium ion battery cell.
As a further technical solution, the battery management unit implements comprehensive monitoring management of the battery system at the cell level, the module level, and the battery rack level.
As a further technical scheme, the integrated cabinet body is provided with a temperature control device, an HMI human-computer interaction interface, an emergency shutdown mechanism and a locking protection mechanism.
By adopting the technical scheme, the invention has the following beneficial effects:
the invention provides an off-grid wind-solar energy storage intelligent power supply system, which aims at solving the problem of power supply in areas without power and in areas without power, adopts two new energy power generation mechanisms of photovoltaic and wind power and a lithium ion battery energy storage module, and realizes the automatic power supply capability of full coverage at day and night under the control of an intelligent EMS energy management system. Compared with the existing traditional photovoltaic power supply or wind power supply system, the system adopts a lithium ion battery with deep charging and discharging and long cycle life to replace the traditional lead-acid battery for power storage, introduces an intelligent EMS energy management system to perform real-time management and control and analysis on the power generation power supply condition and the power load condition, makes a corresponding reasonable management and control strategy, and forms the automatic operation effect of the complete system.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic structural diagram of an off-grid wind-solar energy storage intelligent power supply system provided by an embodiment of the invention;
FIG. 2 is a structural diagram of a wind, light and diesel hybrid power generation system structure provided by an embodiment of the invention;
FIG. 3 is a flow chart of a wind, light and diesel hybrid power generation system structure provided by an embodiment of the invention;
fig. 4 is a schematic control strategy diagram of the wind, light and diesel hybrid power supply system provided by the embodiment of the invention.
Icon: 1-a hybrid converter cell; 2, an alternating current and direct current distribution unit; 3-a lithium ion battery energy storage unit; 4-an integrated cabinet body; 5-an energy management unit; 6-a battery management unit; 7-a communication cable; 8-power cable.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it should be noted that the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., indicate orientations or positional relationships based on the orientations or positional relationships shown in the drawings, and are only for convenience of description and simplicity of description, but do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless otherwise explicitly specified or limited, the terms "mounted," "connected," and "connected" are to be construed broadly, e.g., as meaning either a fixed connection, a removable connection, or an integral connection; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood by those skilled in the art according to specific situations.
The following detailed description of embodiments of the invention refers to the accompanying drawings. It should be understood that the detailed description and specific examples, while indicating the present invention, are given by way of illustration and explanation only, not limitation.
As shown in fig. 1, this embodiment provides an off-grid wind-solar energy storage intelligent power supply system, which includes: an integrated cabinet body 4; the integrated cabinet body 4 is provided with a hybrid converter unit 1(PCS), an alternating current/direct current power distribution unit 2(PDU), an energy management unit 5(EMU), a lithium ion battery energy storage unit 3 and a battery management unit 6 in an integrated mode.
In this embodiment, preferably, the hybrid converter unit 1 is used for dc/dc and dc/ac power conversion related to a photovoltaic system, a wind power system, and the lithium ion battery energy storage unit 3.
Specifically, high-frequency and power-frequency system design is provided according to the type of power demand, and direct current/direct current and direct current/alternating current power conversion related to photovoltaic conversion, wind power conversion and lithium battery conversion is achieved. High accuracy photovoltaic MPPT control, the maximize utilizes solar energy, improves the photovoltaic generated energy. The high protection level is suitable for severe environments such as high altitude, high temperature, high cold and the like, and the long-term continuous and reliable operation of the system is guaranteed. The system has an energy management function, and can realize unmanned and EMS-free autonomous operation. The configuration is flexible, the photovoltaic/wind power charging mode is optional, and the charging time period can be set.
In this embodiment, preferably, the ac/dc power distribution unit 2 is used for distributing power to a photovoltaic system, a power input of a wind power system, an input and an output of the lithium ion battery energy storage unit 3, a load power consumption energy output, and a system internal power consumption.
Specifically, the alternating current-direct current power distribution unit 2 adopts a modular design, and power distribution and guarantee related to links such as power input of photovoltaic and wind power, input and output of an energy storage battery system, load power consumption energy output, power distribution in the system and the like can be realized in a single independent box. And a system state monitoring unit is arranged in the system, monitors the power distribution state of the system, processes corresponding faults, timely realizes protection actions, and reports to an EMS energy management system to record and send instructions to implement corresponding measures of a macro system.
In this embodiment, preferably, the energy management unit 5 is configured to collect and analyze current and voltage signals of the photovoltaic system and the wind power system, state parameters of the lithium battery energy storage unit, and power consumption state parameters of the power consumption load end, and perform real-time feedback control of the system through built-in logic operation.
Specifically, the EMU is a set of logic control software implemented based on power electronic hardware modules such as a protection circuit and a communication circuit as an EMS energy management system in the system. EMS gathers signals such as current and voltage of photovoltaic system, wind power system, the state parameter of lithium cell energy storage module from system to module and electric core level, the power consumption state parameter of power load end, carries out the real-time feedback control of system through built-in logic operation, ensures the high efficiency and the safety of whole distributed power system operation. Meanwhile, the system state is transmitted to a remote control end through a communication transmission function, and a remote supervision and control function of the distributed power system is formed. And the wireless monitoring modes of Wi-fi and GPRS are supported, and the remote control effect of the EMS energy control system is enhanced.
In this embodiment, preferably, the lithium ion battery energy storage unit 3 adopts a ternary lithium ion battery cell.
Specifically, the lithium ion battery energy storage unit 3 is designed to adopt a customized ternary lithium ion battery cell dedicated for energy storage, and the rated voltage of the battery cell is 3.7V, so that the lithium ion battery energy storage unit has the following remarkable advantages: high energy density and power density, deep charge and discharge performance, high charge and discharge multiplying power, wide-range high and low temperature adaptability, long cycle life and the like. Compared with a conventional energy storage type lithium battery system, the lithium battery system in the embodiment can increase the electric quantity by 15% and the output power by 5-10 times under the same volume and weight configuration, and simultaneously meets the application of extremely wide environment temperature of-50 to +60 ℃, so that the full-charging and discharging cycle times of more than 3000 times are realized.
A single battery module is connected through electric core cluster, implants BMS battery management system and carries out functional operation such as electric core voltage collection, electric core temperature collection and electric core equilibrium, ensures whole module normal work high-efficiently safely. The BMS battery management system in the embodiment adopts an active balancing framework, breaks through the mode of a conventional passive balancing framework, can avoid the electric quantity consumption in the traditional balancing scheme while realizing the battery balancing, reserves the electric quantity to the maximum extent, and effectively supplies power for loads. The battery modules have modular matching combination capability, and can form a complete energy storage battery frame through series connection and parallel connection between the battery modules according to the requirements of different application scenes on electric quantity and power. The battery rack is connected to the wire inlet of the battery management unit 6, the working state of the whole battery system is controlled, the voltage and the current of the battery rack are measured in real time, and meanwhile, a plurality of core parameters such as the residual electric quantity, the health parameters and the like of the battery system are calculated.
In this embodiment, preferably, as a further technical solution, the battery management unit 6 implements comprehensive monitoring and management of a battery core level, a module level, and a battery rack level of the battery system.
Specifically, the battery management unit 6 implements comprehensive monitoring management of the battery system at the cell level, the module level, and the battery rack level. The three-level protection framework ensures the stable and reliable operation of the battery system, the wind-solar energy storage type customized energy storage system battery management unit 6 has multiple management functions of real-time monitoring, state analysis, alarm feedback and the like of the battery system, and the ultralow standby power consumption can improve the electric energy storage performance of the battery system.
In this embodiment, preferably, as a further technical solution, the integrated cabinet 4 is installed with a temperature control device, an HMI human-machine interface, an emergency shutdown mechanism, and a locking protection mechanism.
Specifically, the integrated cabinet 4 is integrally provided with all main core function units including a hybrid converter unit 1, an alternating current/direct current power distribution unit 2, an energy management unit 5, a lithium ion battery energy storage unit 3, a battery management unit 6 and the like, and the cabinet is provided with equipment such as a temperature control device, an HMI human-machine interaction interface, an emergency shutdown mechanism, a locking protection mechanism and the like. The cabinet body is internally provided with independent corresponding bin positions according to the size and the structural design of each unit, and layout rationality of a power cable 8, a communication cable 7, an airflow air duct and the like is considered. Each unit module design can be installed and dismantled in real time, and the cabinet body installation removal and later stage fortune dimension work of being convenient for.
The off-grid wind-solar energy storage intelligent power supply system provided by the embodiment is used for solving the problem of power supply in areas without power and in areas without power, two new energy power generation mechanisms, namely photovoltaic and wind power, and a lithium ion battery energy storage module are adopted, and the automatic power supply capacity of full coverage at day and night time periods is realized under the control of an intelligent EMS energy management system. Compared with the existing traditional photovoltaic power supply or wind power supply system, the system adopts a lithium ion battery with deep charging and discharging and long cycle life to replace the traditional lead-acid battery for power storage, introduces an intelligent EMS energy management system to perform real-time management and control and analysis on the power generation power supply condition and the power load condition, makes a corresponding reasonable management and control strategy, and forms the automatic operation effect of the complete system.
The working principle of the embodiment is as follows: the system adopts an alternating current micro-grid architecture, and units such as a current transformer, a load, a distributed new energy system and the like are synchronously accessed. The operation of the complete system is controlled through the EMS energy management system, and according to specific application occasions, corresponding control strategies are automatically judged and selected in real time, so that the safe power supply of the load is guaranteed.
The photovoltaic and wind power generation system is used as a power generation unit to generate electric energy and input the electric energy to an internal system;
the lithium ion battery energy storage unit is used as an electric energy storage unit, has a bidirectional power flow direction function, receives power input of a photovoltaic and wind power generation system, and outputs power to a load;
the hybrid converter supplies the real-time power generation power of the photovoltaic and wind power generation system to a load for use, and the redundant power charges the energy storage system. When the output power of the photovoltaic and wind power generation system is smaller than the load power, for example, under the conditions of night, rainy, dim light, weak wind and the like, the energy storage provides the shortage power to supplement the load;
the EMS energy management system is used as a logic operation control unit of the whole system and used for controlling the normal operation of each unit device such as a power generation unit, a power utilization load, an energy storage system and the like.
The communication system forms internal transmission communication of information flow of each unit and communication control function between the system and external remote control unit.
In the embodiment, the wind, light and diesel complementary power generation system comprises and has the following components in principle:
the wind-solar-diesel complementary power generation system is additionally provided with a lithium ion battery energy storage system and an intelligent energy management system on the basis of a traditional diesel generator set, a photovoltaic system and a wind power generation system. According to the scheme, the power generation effects of two main renewable energy sources, namely the diesel generator set, the photovoltaic energy source and the wind power source, are fully exerted, and meanwhile, the lithium ion battery system with deep charge-discharge capacity and thousands of cycle lives is used for fully storing and releasing power, so that the power consumption requirements in different periods are effectively met. The energy management system monitors and controls the power supply end and the load end in real time, the power supply reliability and the intelligent automatic operation degree of the system are fully improved, and a regional micro-grid power supply system is formed.
The structure of the wind, light and diesel hybrid power supply system is shown in figure 2: the direct current bus side comprises all direct current power supplies (photovoltaic battery packs), storage battery packs and loads; the AC bus side comprises all AC power supplies (a fan and a diesel generator set) and loads. The direct current bus and the alternating current bus are connected together through the bidirectional converter. According to the solar energy, wind energy and storage condition of the storage battery pack of the system, the bidirectional converter can invert the electric energy at the direct current bus side to the alternating current bus side or rectify the redundant electric energy at the alternating current bus side to the direct current bus. The process is controlled by the intelligent energy management system in real time. The ultimate goal of the overall system is to maintain frequency and amplitude stability of the voltage.
Referring to fig. 3, a design flow of the wind, light and diesel hybrid system is shown, and the design of the wind, light and diesel hybrid system is based on actual load requirements of a project, and local wind and light resource conditions and installation conditions are fully considered. And fully considering the expandability and the convenient implementation of the system scheme, the method mainly comprises the following steps:
deeply analyzing the working principle of the photovoltaic array, the working characteristics of the wind driven generator and the relevant characteristics of the storage battery;
and establishing a mathematical model of an important device in the system through parameter testing, and carrying out capacity configuration calculation by combining with engineering load requirements.
And a research method of comparative analysis is adopted to carry out comparative analysis on the aspects of manufacturing cost, energy conservation, safety and the like of the wind-light-diesel hybrid power generation system and the independent commercial power supply system.
The key design steps are as follows: controlling the energy output of the wind energy and solar energy power generation systems to enable the power generation systems to output maximum power to a load, and adopting maximum power point tracking control; and performing software programming and model simulation research according to a system control strategy. On the basis of the combination of theoretical research and engineering practice, the construction scheme of the wind, light and diesel power generation system is determined.
With reference to fig. 4, for the control strategy of the wind, light and diesel hybrid power supply system, the optimal system configuration can be obtained by simulating the performance and power supply cost of different system configurations; the capacity configuration of the wind-solar-diesel hybrid power generation system can be optimally designed by a multi-objective optimization algorithm corresponding to different power requirements and different meteorological environments, so that the cost input of the wind-solar-diesel hybrid power generation system is reduced, and the utilization degree of wind-solar resources is improved; through reasonable design and matching, better economic benefit can be obtained, and meanwhile, energy conservation and environmental protection are considered.
The optimal matching design method of the wind-solar complementary independent power generation system is an automatic optimization method, and the specific optimal design principle is as follows: on the premise of meeting the reliability of power utilization of users:
step one, considering that a wind generating set supplies power to users (the power supply share of the wind generating set is 100 percent and the solar power generation is zero), calculating the power of the wind generating set required at the moment and the initial investment condition of a system;
secondly, gradually reducing the power supply proportion of the wind generating set (the amplitude of reducing the total amount by 1% every time), and correspondingly increasing the power supply proportion of the solar photovoltaic set (the amplitude of increasing the total amount by 1% every time), so that the design result of matching the system components at the moment and the initial investment of the system can be obtained through calculation, then the initial investment number of the system at the moment is compared with that of the previous time, and small abandon is reserved;
and circularly repeating the second step until the optimized matching combination of the system components with the minimum initial system investment is screened out by the program. The result obtained by the steps can not only meet the power utilization reliability of the user, but also minimize the initial investment of the system.
In conclusion, the converter, the energy storage battery and the energy control system are integrally designed and installed, so that the integration degree is high; the topological structure and the operation logic of the intelligent EMS energy management system and the BMS battery management system; the modular design form of each unit is flexibly matched according to the requirement change of an application scene, so that various requirements are met; under the condition of the same type battery module design, the electric quantity is variable, and the power is variable; the wind-solar energy storage off-grid power supply function is strong in applicability and wide in adaptive scene.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (7)
1. The utility model provides an off-grid scene stores up intelligent power supply system which characterized in that includes: an integrated cabinet body; the integrated cabinet body is integrally provided with a hybrid converter unit, an alternating current-direct current power distribution unit, an energy management unit, a lithium ion battery energy storage unit and a battery management unit.
2. The method of the off-grid wind-solar-energy-storage intelligent power supply system according to claim 1, wherein the hybrid converter unit is used for direct current/direct current and direct current/alternating current power conversion related to a photovoltaic system, a wind power system and a lithium ion battery energy storage unit.
3. The method of the off-grid wind-solar-energy storage intelligent power supply system according to claim 1, wherein the alternating current-direct current power distribution unit is used for distributing power to a photovoltaic system, a power supply input of a wind power system, input and output of a lithium ion battery energy storage unit, load power utilization energy output and power utilization inside the system.
4. The method of the off-grid wind-solar energy-storage intelligent power supply system according to claim 1, wherein the energy management unit is used for collecting and analyzing current and voltage signals of a photovoltaic system and a wind power system, state parameters of a lithium battery energy storage unit and power utilization state parameters of a power utilization load end, and real-time feedback control of the system is performed through built-in logic operation.
5. The method of the off-grid wind-solar energy storage intelligent power supply system according to claim 1, wherein the lithium ion battery energy storage unit adopts a ternary lithium ion battery cell.
6. The method of the off-grid wind, photovoltaic and energy storage intelligent power supply system according to claim 1, wherein the battery management unit implements comprehensive monitoring management at a cell level, a module level and a battery rack level of the battery system.
7. The method of an off-grid wind-solar energy storage intelligent power supply system according to claim 1, wherein the integrated cabinet body is provided with a temperature control device, an HMI human-machine interaction interface, an emergency shutdown mechanism and a locking protection mechanism.
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