Light-storage-diesel multi-energy complementary micro-grid system and construction method

Abstract

The invention discloses a photovoltaic-stored-diesel multi-energy complementary micro-grid system and a construction method, the system is deployed in an area without commercial power, a photovoltaic sub-array in the system is configured to be connected to a photovoltaic confluence cabinet through a plurality of photovoltaic inverters, the photovoltaic confluence cabinet is connected to a photovoltaic incoming line cabinet through a first transformer, and the photovoltaic incoming line cabinet is connected to an outgoing line cabinet; the energy storage assembly is configured to be connected to an energy storage confluence cabinet, the energy storage confluence cabinet is connected to an energy storage wire inlet cabinet through a second transformer, and the energy storage wire inlet cabinet is connected to a wire outlet cabinet; the diesel generator set is configured to be connected into the diesel generator incoming line cabinet through the synchronous control cabinet, and the diesel generator incoming line cabinet is connected to the outgoing line cabinet. According to the scheme of the system, the energy storage system is used as a core to construct a network, and the diesel generator is only used for guarantee, so that the maximum utilization of solar energy resources is realized, and the carbon emission and the influence on the environment in the project construction process are remarkably reduced.

Description

Technical Field

[0001] The present invention relates to photovoltaic power supply technology, and in particular to photovoltaic power supply technology. Background Art

[0002] Centralized photovoltaic power station projects are usually located in remote areas such as deserts, Gobi, and wastelands. There is usually no power supply from the grid during the construction process. In order to meet the electricity needs of construction, office, and life, diesel generators are usually used for power supply. Diesel generators have high power generation costs, and diesel generators are noisy during operation, which will have an adverse impact on work and rest, and have high emissions and cause serious environmental pollution. Summary of the invention

[0003] In view of the problem that centralized photovoltaic power stations built in remote areas such as deserts, Gobi, and wastelands have no power supply from the power grid and use diesel generators for power supply, the purpose of the present invention is to provide a photovoltaic, storage, and diesel multi-energy complementary microgrid system for the environment of centralized photovoltaic power stations built in remote areas such as deserts, Gobi, and wastelands. The system is based on off-grid scenarios and is networked with the energy storage system as the core. The diesel generator is only used for security, which maximizes the utilization of solar energy resources and significantly reduces carbon emissions and environmental impacts during project construction. On this basis, the present invention also aims at a construction method of the photovoltaic, storage, and diesel multi-energy complementary microgrid system.

[0004] In order to achieve the above-mentioned purpose, the present invention provides a photovoltaic storage diesel multi-energy complementary microgrid system, which is deployed in an area without city power, and includes a photovoltaic sub-array, a plurality of photovoltaic inverters, a plurality of transformers, an energy storage component, a diesel generator set, a photovoltaic junction cabinet, an energy storage junction cabinet, a photovoltaic incoming cabinet, an energy storage incoming cabinet, an outgoing cabinet, a synchronous control cabinet, and a diesel generator incoming cabinet;

[0005] The photovoltaic sub-array is configured to be connected to a photovoltaic combiner cabinet through a plurality of photovoltaic inverters, the photovoltaic combiner cabinet is connected to a photovoltaic incoming line cabinet through a first transformer, and the photovoltaic incoming line cabinet is connected to an outgoing line cabinet;

[0006] The energy storage assembly is configured to be connected to an energy storage combiner cabinet, the energy storage combiner cabinet is connected to the energy storage incoming cabinet via a second transformer, and the energy storage incoming cabinet is connected to the outgoing cabinet;

[0007] The diesel generator set is configured to be connected to a diesel generator incoming cabinet through a synchronization control cabinet, and the diesel generator incoming cabinet is connected to an outgoing cabinet.

[0008] In some embodiments of the present invention, the photovoltaic incoming cabinet, diesel generator incoming cabinet, outgoing cabinet and energy storage incoming cabinet are directly configured to form a common bus.

[0009] In some embodiments of the present invention, the plurality of photovoltaic inverters enter the photovoltaic combiner cabinet through separate AC cables respectively.

[0010] In some embodiments of the present invention, a microgrid monitoring system is provided in the complementary microgrid system, and the microgrid monitoring system is configured to perform energy planning and actual management, energy metering result management, energy quality management, and energy report management through logical combination calculations.

[0011] In some embodiments of the present invention, the microgrid monitoring system is composed of a data acquisition unit, a communication network unit, a monitoring center unit and a user interaction unit that cooperate with each other;

[0012] The data acquisition unit is configured to collect real-time data of various devices and nodes in the microgrid;

[0013] The communication network unit is configured to establish a stable and reliable data transmission channel between the data acquisition unit and the monitoring center unit;

[0014] The monitoring center unit is configured to process, analyze and support decision making based on the real-time data of each device and node in the microgrid collected by the received data acquisition unit;

[0015] The user interaction unit is configured to perform data interaction with the monitoring center unit.

[0016] In some embodiments of the present invention, the microgrid monitoring system is configured with a multi-energy medium collaborative optimization scheduling unit, and the multi-energy medium collaborative optimization scheduling unit is configured to analyze and process data of different energy media to form an optimization scheduling plan for different energy media.

[0017] In some embodiments of the present invention, the multi-energy medium collaborative optimization scheduling unit is specifically composed of a data acquisition and processing module, an optimization scheduling module, a prediction module and a control module that cooperate with each other;

[0018] The data acquisition and processing module is configured to collect operating data from different energy media in real time and perform preliminary processing and analysis;

[0019] The optimization scheduling module is configured to interact with the data acquisition and processing module and the prediction module, and can perform optimization calculations based on the real-time operation data of different energy media processed and analyzed by the data acquisition and processing module, and the future energy demand and supply conditions predicted by the prediction module, so as to generate an optimal scheduling plan;

[0020] The prediction module is configured to interact with the optimization scheduling module, the processing module and the prediction module to predict future energy demand and supply using historical data and machine learning algorithms;

[0021] The control module is configured to interact with the optimization scheduling module in data, and can generate scheduling instructions according to the optimal scheduling plan generated by the optimization scheduling module, and schedule the direct synergy of various energy media based on the scheduling instructions.

[0022] In order to achieve the above-mentioned purpose, the present invention provides a construction method for a photovoltaic, energy storage and diesel multi-energy complementary microgrid system, which sequentially includes photovoltaic component installation steps, energy storage equipment installation steps, box-type substation installation steps, diesel generator set installation steps, cable construction steps, control system construction steps, system debugging steps, and system trial operation steps.

[0023] In some embodiments of the present invention, the installation steps of the box-type substation specifically include transportation of the substation, preparation of the foundation, positioning and fixing of the substation, installation of electrical equipment, and commissioning of the protection and control system.

[0024] In some embodiments of the present invention, the installation steps of the diesel generator set include transportation of the generator set, pouring of the foundation, positioning and fixing of the set, installation of the exhaust and cooling systems, and debugging of the electrical connection and control system.

[0025] The solution provided by the present invention has the following technical advantages over the prior art:

[0026] (1) Off-grid use, energy saving and carbon reduction

[0027] This system solution is based on off-grid scenarios and is networked with the energy storage system as the core. Diesel generators are only used for security purposes, maximizing the utilization of solar energy resources and significantly reducing carbon emissions and environmental impacts during project construction.

[0028] (2) Operation strategy, intelligent optimization

[0029] Based on the microgrid monitoring system, this system can effectively optimize the operation strategy of the energy management system (EMS) based on the historical load change data of the project, and reduce the noise pollution during the operation of the diesel generator. The diesel generator adopts synchronous follow-up control technology to ensure seamless switching between different operation modes.

[0030] (3) Scope of application

[0031] It is suitable for the construction of office and living power supply systems during the project construction period in areas without city power such as deserts, Gobi, and wastelands.

[0032] (4) Significant benefits and environmentally friendly

[0033] Taking the case in the specific implementation as an example, the system's maximum daily power generation capacity can reach 990kW, and the daily renewable energy usage is about 4000kW·h, accounting for 80% of the total daily electricity consumption, reducing carbon dioxide emissions by 7.57 tons / day, with significant social and economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0034] The present invention is further described below in conjunction with the accompanying drawings and specific embodiments.

[0035] Figure 1 This is the system topology diagram of the photovoltaic, storage and diesel multi-energy complementary microgrid system in the present invention;

[0036] Figure 2 This is a schematic diagram of the operation strategy of the photovoltaic, storage and diesel multi-energy complementary microgrid system in the present invention;

[0037] Figure 3 The daily irradiance variation diagram of the deployment area in the example of the present invention. DETAILED DESCRIPTION

[0038] In order to make the technical means, creative features, objectives and effects achieved by the present invention easy to understand, the present invention is further explained below with reference to specific diagrams.

[0039] Aiming at the environment of building centralized photovoltaic power stations in remote areas such as deserts, Gobi, and wastelands, the present invention provides a photovoltaic-energy storage-diesel multi-energy complementary microgrid system. The system solution can make full use of solar energy resources, which not only saves energy expenditure during project construction and reduces carbon emissions, but also improves the working and rest environment.

[0040] This photovoltaic-energy storage-diesel multi-energy complementary microgrid system is mainly composed of a photovoltaic power generation subsystem, an energy storage subsystem and a diesel power generation subsystem, which cooperates with a photovoltaic-energy storage-diesel multi-energy complementary microgrid system to achieve stable power supply.

[0041] See also Figure 1 , which shows the system topology diagram of the photovoltaic-energy storage-diesel generator multi-energy complementary microgrid system 100 during implementation.

[0042] Based on the diagram, the photovoltaic-energy storage-diesel generation multi-energy complementary microgrid system 100 mainly includes a photovoltaic generation subsystem 110, an energy storage subsystem 120, a diesel generation subsystem 130 and a microgrid monitoring subsystem 140.

[0043] The photovoltaic power generation subsystem 110 in this system is mainly composed of a photovoltaic sub-array 111, a plurality of intelligent photovoltaic inverters 112, a first step-down transformer 113, a photovoltaic junction cabinet (not shown in the figure), a photovoltaic incoming line cabinet 114 and an outgoing line cabinet 115.

[0044] The photovoltaic sub-array 111 is configured to be connected to a photovoltaic combiner cabinet through a plurality of intelligent photovoltaic inverters 112 , and the photovoltaic combiner cabinet is connected to a photovoltaic incoming line cabinet 114 through a step-down transformer 113 , and the photovoltaic incoming line cabinet 114 is connected to an outgoing line cabinet 115 .

[0045] As a preferred configuration, the photovoltaic incoming cabinet 114 here is configured to output electrical energy to the outgoing cabinet 115 via the busbar 116 .

[0046] As a further explanation, the specific structure of the photovoltaic sub-array 111 in the photovoltaic power generation sub-system 110 is not limited here and can be determined according to actual needs.

[0047] For example, when the photovoltaic sub-array 111 is implemented, its requirements in terms of electrical connection, material selection and weather resistance ensure that it can operate stably under various environmental conditions; at the same time, the installation position and angle of the photovoltaic sub-array 111 can meet the requirements of maximizing the solar energy absorption efficiency.

[0048] The intelligent photovoltaic inverter 112 in the photovoltaic power generation subsystem 110 is a key device for converting direct current into alternating current. It is innovatively composed of a digital signal processor DSP and an intelligent control algorithm. It can monitor the power grid status and the power generation of the photovoltaic panels in real time, automatically adjust the output voltage and frequency, and ensure the stability and efficiency of the power output.

[0049] Specifically, the intelligent photovoltaic inverter 112 includes input filter circuit, DC / DC boost circuit, DC / AC inverter circuit, output filter circuit, control circuit board, etc. In addition, the inverter is also equipped with remote monitoring and fault diagnosis functions, which can monitor the working status of the inverter in real time, find and handle faults in time, thereby effectively improving the reliability and maintenance efficiency of the system.

[0050] The first step-down transformer 113 in the photovoltaic power generation subsystem 110 is used to reduce the voltage to ensure stable transmission of electric energy.

[0051] In the specific implementation, the first step-down transformer 113 preferably adopts high-efficiency and energy-saving silicon steel sheet core and high-quality copper wire winding, which has the characteristics of low loss, high efficiency, low noise, etc. Its structure includes high-voltage winding, low-voltage winding, core, insulation material, shell, etc.

[0052] As an example, the first step-down transformer 113 can withstand long-term high-load operation in terms of insulation performance, cooling system and protection device settings, and at the same time has good heat dissipation performance and multiple protection mechanisms to prevent equipment damage due to overload or short circuit.

[0053] The photovoltaic junction cabinet in the photovoltaic power generation subsystem 110 is an important component connecting the photovoltaic array and the inverter. It is mainly used to converge and distribute the DC current generated by multiple photovoltaic panels. It is composed of input terminals, fuses, DC circuit breakers, buses, output terminals and other parts, and can monitor the working status of each photovoltaic array in real time to ensure the efficient operation of the entire system.

[0054] The photovoltaic incoming line cabinet 114 in the photovoltaic power generation subsystem 110 is mainly used to receive the electricity generated by the photovoltaic power station and send it to the power grid. The specific composition of the photovoltaic incoming line cabinet 114 includes incoming line circuit breakers, current transformers, voltage transformers, metering instruments, control circuit boards and other parts. The incoming line cabinet can monitor power parameters such as voltage, current, power factor, etc. in real time, and has overcurrent, overvoltage, undervoltage and other protection functions to ensure the safety and stability of power transmission.

[0055] In the photovoltaic power generation subsystem 110 configured in this way, a number of intelligent photovoltaic inverters 112 convert the direct current generated by the photovoltaic sub-array 111 into alternating current and transmit it to the photovoltaic junction cabinet. The alternating current is stepped down by the first step-down transformer 113 in the photovoltaic junction cabinet and then connected to the photovoltaic incoming line cabinet 114. Finally, the photovoltaic incoming line cabinet 114 outputs electric energy to the outgoing line cabinet 115 through the busbar 116, thereby forming the photovoltaic power generation subsystem 110.

[0056] The energy storage subsystem 120 in the present system is composed of an energy storage component 121 , an energy storage combiner cabinet (not shown in the figure), an isolation transformer 122 and an energy storage incoming line cabinet 123 .

[0057] The energy storage assembly 121 is configured to be connected to an energy storage combiner cabinet, the energy storage combiner cabinet is connected to an energy storage incoming cabinet 123 via an isolation transformer 122 , and the energy storage incoming cabinet 123 is connected to an outgoing cabinet 115 .

[0058] As a preferred configuration, the energy storage incoming cabinet 123 is configured to share the same busbar 116 with the outgoing cabinet 115 .

[0059] As a further explanation, the energy storage component 121 in the energy storage subsystem 120 is specifically composed of a battery module, a battery management system (BMS), and related protection and monitoring equipment. The battery module is responsible for storing electrical energy, and the battery management system is configured to control the connection of the battery module to ensure the safe operation and efficient use of the battery; the protection device is preferably configured by a circuit breaker and a fuse, configured to cooperate with the battery management system (BMS), and can cut off the circuit under abnormal circumstances to prevent accidents; the monitoring device is configured to cooperate with the battery management system (BMS), and can monitor the battery status in real time, including voltage, current, temperature and other parameters, to ensure the stability and reliability of the system.

[0060] The energy storage combiner in the energy storage subsystem 120 is used to cooperate with the energy storage component 121 to collect the electric energy of multiple battery modules and make appropriate voltage and current adjustments to meet the needs of the power grid or load.

[0061] The energy storage combiner cabinet is equipped with multiple input and output ports and corresponding protection and control devices. The protection and control devices are configured to be connected to the corresponding multiple battery modules, and can control the balance of the corresponding input and output currents and voltages of the multiple battery modules to ensure uniform charging and discharging of each battery module.

[0062] The isolation transformer 122 in the energy storage subsystem 120 is configured to isolate the power grid and the energy storage system to prevent the safe operation of the energy storage device from being affected when a power grid failure occurs.

[0063] Specifically, the isolation transformer 122 preferably uses an energy-efficient silicon steel core and high-quality copper wire windings, and has the characteristics of low loss, high efficiency, low noise, etc. The isolation transformer 122 specifically comprises a high-voltage winding, a low-voltage winding, a core, an insulating material, a housing, and other parts.

[0064] At the same time, the isolation transformer 122 is also configured to perform voltage conversion to adjust the voltage of the energy storage system to a level suitable for grid access.

[0065] The energy storage incoming line cabinet 123 in the energy storage subsystem 120 is configured as an interface device to connect the energy storage system to the power grid. The energy storage incoming line cabinet 123 can safely and stably send the electric energy generated by the energy storage system to the power grid.

[0066] The energy storage incoming line cabinet 123 is specifically composed of circuit breakers, isolating switches, current and voltage transformers and other equipment that cooperate with each other to ensure the safety and reliability of power transmission.

[0067] Specifically, the circuit breaker in the energy storage incoming cabinet 123 is preferably a high-performance circuit breaker, which is configured to effectively isolate the fault circuit and ensure the safe connection between the energy storage system and the power grid.

[0068] The isolating switch in the energy storage incoming cabinet 123 is configured to have high insulation performance and reliable mechanical strength, and can work stably under different working conditions to ensure the continuity and stability of power transmission.

[0069] The current and voltage transformers in the energy storage incoming line cabinet 123 are configured as key monitoring equipment of the energy storage incoming line cabinet 123. It is preferred to use high-precision, wide-measuring-range transformers, which are configured to monitor the current and voltage changes during the power transmission process in real time, and provide data support for the safe and stable operation of the system.

[0070] As a further configuration, the energy storage incoming line cabinet 123 is further configured with protection function devices, such as overcurrent, overvoltage, undervoltage and short-circuit protection devices.

[0071] In the energy storage subsystem 120 configured in this way, the matching energy storage components 121 are first converged to the energy storage convergence cabinet, and then connected to the energy storage incoming cabinet 123 on the same bus as the outgoing cabinet 115 through the isolation transformer 122, thereby forming the energy storage subsystem 120.

[0072] The diesel generator subsystem 130 in this system is composed of a diesel generator set 131, a synchronous control cabinet 132, and a diesel generator incoming line cabinet 133.

[0073] The diesel generator set 131 is connected to the diesel generator incoming cabinet 133 of the same bus 116 as the outgoing cabinet 115 through the synchronous control cabinet 132, thereby forming a diesel generator subsystem 130.

[0074] As a preferred configuration, the diesel generator incoming line cabinet 133 is configured to share the same busbar 116 with the outgoing line cabinet 115 .

[0075] As a further explanation, the diesel generator set 131 in the diesel generator subsystem 130 is specifically composed of key components such as an engine, a generator, and a control system. The engine here is preferably a high-efficiency, low-emission model to ensure stable and environmentally friendly operation. The generator is configured to have sufficient power output to meet various load requirements. The control system needs to integrate intelligent monitoring functions, which can monitor the operating status of the unit in real time and automatically perform fault warning and processing; the control system is further configured with a grid-connected linkage module, which can control the unit to operate in parallel and seamlessly connect to the power grid to ensure the continuity and reliability of power supply.

[0076] As a further explanation, the synchronization control cabinet 132 in the diesel generator subsystem 130 is specifically configured to connect and cooperate with the diesel generator set 131 to control the diesel generator set to be connected to the grid.

[0077] The synchronous control cabinet 132 is specifically configured with a synchronous detection unit, a control logic unit and an actuator. The synchronous detection unit is configured to be connected to the diesel generator set 131, and can accurately measure the voltage, frequency and phase of the unit to ensure consistency with the grid parameters; the control logic unit is configured to be connected and coordinated with the synchronous detection unit, and can automatically adjust the unit parameters according to the detection results to achieve synchronization with the grid. The actuator is configured to be connected and coordinated with the control logic unit, and can execute the instructions of the control logic unit to complete the grid connection operation.

[0078] As a further illustration, the diesel generator incoming cabinet 133 in the diesel generator subsystem 130 is configured to connect the power output of the diesel generator set to a power grid or a load.

[0079] Specifically, the incoming line cabinet 133 of the diesel generator is provided with a circuit breaker, an isolating switch, and a current transformer. Among them, the circuit breaker is configured to have protection functions such as overload and short circuit to ensure the safe operation of the circuit. The isolating switch is configured to isolate the unit from the power grid during the overhaul or maintenance of the unit to ensure the safety of personnel. The current transformer is configured to measure the output current of the unit to provide data support for the monitoring and protection system.

[0080] The diesel generator incoming cabinet 133 is configured to realize the expandability and compatibility of the incoming cabinet simultaneously to adapt to diesel generator sets of different sizes and types.

[0081] The diesel generator set 131, the synchronous control cabinet 132 and the diesel generator incoming line cabinet 133 in the diesel generator electronic system 130 are based on the integrated Internet of Things to achieve remote monitoring and data analysis of the unit's operating status, thereby improving the operation and maintenance efficiency. On this basis, the diesel generator set 131 is further equipped with high-precision sensors that can collect key parameters such as the speed, temperature, and pressure of the generator in real time.

[0082] At the same time, the diesel generator set 131 is also equipped with a control and optimization module, which improves the energy efficiency and stability of the set based on a control algorithm and an optimization strategy.

[0083] This control and optimization module can predict the future operating status of the unit based on historical data and real-time data, and adjust the control parameters in advance to optimize the energy efficiency and stability of the unit. For example, when it is predicted that the load is about to increase, the system can increase the output power of the diesel generator set in advance to ensure the stability and continuity of power supply.

[0084] Furthermore, the diesel generator set 131 is also provided with an adaptive control module, which is configured to automatically adjust the output of the set according to load changes and grid requirements, thereby achieving more flexible and efficient power supply.

[0085] The adaptive control module is specifically configured to be able to quickly calculate the optimal unit output power by real-time monitoring of the voltage, current and other parameters of the power grid, as well as the real-time demand of the load, using an adaptive algorithm, and to achieve automatic adjustment of the output power by controlling the speed and fuel supply of the diesel generator set. Based on this adaptive control module, not only the flexibility and efficiency of power supply are improved, but also the energy consumption and emissions of the unit are greatly reduced.

[0086] The microgrid monitoring subsystem 140 in this system is specifically configured to achieve energy planning and actual management, energy metering result management, energy quality management, and energy report management through logical combination calculations.

[0087] Specifically, the microgrid monitoring subsystem 140 is composed of a data acquisition unit, a communication network unit, a monitoring center unit and a user interaction unit that cooperate with each other.

[0088] The data acquisition unit is configured to collect real-time data of various devices and nodes in the microgrid, such as voltage, current, power, etc.

[0089] The communication network unit is configured to establish a stable and reliable data transmission channel between the data acquisition unit and the monitoring center unit, thereby enabling the real-time data collected by the data acquisition unit to be efficiently and reliably transmitted to the monitoring center unit.

[0090] The monitoring center unit is the core of the entire system, and is used to process, analyze and provide decision support based on the real-time data of each device and node in the microgrid collected by the received data acquisition unit.

[0091] The user interaction unit is configured to perform data interaction with the monitoring center unit, thereby providing an intuitive operation platform for operators to facilitate monitoring and management.

[0092] As a further explanation, a number of intelligent sensors are provided in the data acquisition unit in the microgrid monitoring subsystem 140. These intelligent sensors are deployed in the corresponding devices and nodes in the microgrid, and can collect key data such as voltage, current, power, etc. of each device and node in the microgrid in real time and accurately.

[0093] The smart sensors here have high precision, high stability and high reliability, which can ensure the accuracy of data collection.

[0094] The data acquisition unit is also equipped with an Internet of Things module, which is configured to connect various devices and nodes through the Internet of Things protocol to form a unified data acquisition network. Based on this Internet of Things module, the interconnection between devices can be achieved, improving the efficiency and reliability of data acquisition.

[0095] The data acquisition unit is also equipped with a data processing module, which is configured to obtain the raw data collected by the smart sensors deployed on various devices and nodes in the microgrid through the Internet of Things module, and can pre-process the data based on the data pre-processing algorithm after obtaining the raw data, including data cleaning, data compression, data transformation, etc., to improve the availability and readability of the data. Then, the data processing module performs real-time analysis on the pre-processed data, discovers abnormal data in time and takes corresponding processing measures to ensure the accuracy and integrity of the data.

[0096] In the specific implementation, in order to achieve compatibility with various types of equipment in the microgrid, the data acquisition unit adopts a modular design. Each module is customized for different types of equipment and can realize data collection and processing of specific equipment. This modular design enables the data acquisition unit to flexibly respond to different types of equipment and improve the compatibility and scalability of the system.

[0097] As a further explanation, the monitoring center unit in the microgrid monitoring subsystem 140 has powerful data analysis and processing capabilities, and can conduct in-depth analysis of the collected data through complex algorithms and models, thereby providing a scientific basis for the optimized operation of the microgrid.

[0098] Specifically, the monitoring center unit here is equipped with a number of sensors, such as current sensors, voltage sensors, temperature sensors, humidity sensors, etc. These sensors are deployed in key locations of the microgrid, such as power generation equipment, energy storage equipment, transmission lines, load nodes, etc. The data collected by the sensors are transmitted to the data acquisition unit by wireless or wired means, and the data acquisition unit then pre-processes and packages the data and then transmits it to the monitoring center unit.

[0099] The monitoring center unit is also configured to perform in-depth analysis of the collected data based on the data analysis algorithm after receiving the data transmitted by the data acquisition unit. As an example, the monitoring center unit uses intelligent data processing algorithms and models to achieve in-depth analysis of the collected data, such as machine learning algorithms, deep learning algorithms, data mining algorithms, etc. These algorithms and models can quickly process and analyze massive amounts of data and extract valuable information and knowledge, such as the operating status of energy equipment, energy efficiency evaluation, fault warning, etc. This information provides a scientific basis for the optimized operation of the microgrid, and helps to achieve efficient use of energy and stable operation of equipment.

[0100] As a further explanation, the monitoring center unit in the microgrid monitoring subsystem 140 is also configured to perform energy planning and actual management. The monitoring center unit adopts a logical combination calculation method by logically combining and calculating various energy data.

[0101] Specifically, the monitoring center unit is configured to define the logical relationships and calculation rules of various energy data according to the actual situation and operation requirements of the microgrid. For example, based on historical data and prediction models, the energy demand and supply in the future period can be calculated; based on the energy efficiency and operating status of the equipment, the energy distribution and scheduling strategy can be adjusted.

[0102] On this basis, the defined logical relationships and calculation rules are formed into the operation control logic and embedded into the software system of the monitoring center unit. Through logical combination and calculation, the formulation of energy plans and the adjustment of actual management are realized. Such a logical combination calculation method can comprehensively consider various factors to achieve optimal configuration and efficient utilization of energy. On this basis, this monitoring center unit generates a detailed energy plan based on the calculation results and compares and analyzes it with the actual operation data. As a result, operators can find deviations in time and take corresponding adjustment measures to ensure the smooth implementation of the energy plan.

[0103] As a further explanation, the monitoring center unit in the microgrid monitoring subsystem 140 achieves energy metering result management by accurately measuring and recording the collected energy data to ensure the accuracy and reliability of the data.

[0104] As a further explanation, the monitoring center unit in the microgrid monitoring subsystem 140 implements energy quality management by real-time monitoring and adjusting the quality of energy in the microgrid (such as voltage stability, frequency stability, etc.) to ensure that the energy quality meets the standard requirements.

[0105] As a further explanation, the monitoring center unit in the microgrid monitoring subsystem 140 realizes energy report management by automatically generating various energy reports, such as daily reports, monthly reports and annual reports, thereby providing decision support for management and facilitating the audit and evaluation of energy use.

[0106] As a further explanation, the microgrid monitoring subsystem 140 is also configured with a multi-energy medium collaborative optimization scheduling unit, which is configured to analyze and process data from different energy media to form optimized scheduling plans for different energy media, thereby improving the energy utilization rate of the entire system.

[0107] Specifically, the multi-energy medium collaborative optimization scheduling unit is composed of a data acquisition and processing module, an optimization scheduling module, a prediction module and a control module that cooperate with each other.

[0108] The data acquisition and processing module in this unit serves as the basis of the entire multi-energy medium collaborative optimization scheduling unit. It collects operating data from different energy media in real time and performs preliminary processing and analysis.

[0109] As an example, this data acquisition and processing module is configured to quickly process and analyze massive data based on intelligent algorithms and models to extract valuable information and knowledge, such as the operating status of energy equipment, energy efficiency evaluation, fault warning, etc., such as machine learning algorithms, deep learning algorithms, data mining algorithms, etc.

[0110] The data acquisition and processing module also transmits the collected data to the data acquisition preprocessing module by wireless and wired means, preprocesses and packages the data, and then transmits it to the prediction module and the control module.

[0111] The optimization scheduling module in this unit is configured to interact with the data acquisition and processing module and the prediction module. It can perform optimization calculations based on the real-time operating data of different energy media processed and analyzed by the data acquisition and processing module, and the future energy demand and supply conditions predicted by the prediction module, so as to generate the optimal scheduling plan.

[0112] The prediction module in this unit is configured to interact with the optimization scheduling module, the processing module and the prediction module to predict future energy demand and supply using historical data and machine learning algorithms, thereby providing a basis for optimization scheduling.

[0113] The control module in this unit is configured to interact with the optimization scheduling module data, and can generate scheduling instructions according to the optimal scheduling plan generated by the optimization scheduling module, and schedule the direct coordination of various energy media based on the scheduling instructions to ensure that each energy medium operates according to the predetermined plan.

[0114] As a further explanation, the data acquisition and processing module in the multi-energy medium collaborative optimization scheduling unit can be presented in the form of a data platform during its specific implementation. The platform can integrate data from different energy media and provide a unified interface for access by other components, thereby realizing real-time collection of operating data from different energy media and performing preliminary processing and analysis.

[0115] On this basis, a corresponding optimization scheduling module is constructed. This optimization scheduling module finds the optimal scheduling solution by establishing an optimization scheduling mathematical model and performing optimization scheduling calculations. This module can process large-scale data and quickly find the optimal solution.

[0116] As an example, the process of optimizing scheduling mathematical modeling to perform optimization scheduling calculations and determine the optimal scheduling solution is as follows:

[0117] For the preset time, the optimized scheduling mathematical modeling gives priority to using photovoltaic power generation to provide the required power for the load. If there is any surplus energy, it will be stored in the battery. It is determined through calculation that if there is still surplus energy after the battery is fully charged, the light will be abandoned. It is determined through calculation that if the power of photovoltaic power generation cannot meet the load demand, the battery discharge will be considered first to supplement the required power. If the minimum battery discharge value is reached and still does not meet the requirements, the required power will be supplemented by diesel engine power generation.

[0118] On this basis, we further build a corresponding prediction module, using data analysis and machine learning technology to calculate the energy demand and supply in the future based on historical data and prediction models; adjust the energy distribution and scheduling strategy according to the energy efficiency and operating status of the equipment to improve the accuracy and reliability of the prediction. The prediction module maintains high-frequency data interaction with the optimization scheduling module to ensure that the scheduling plan generated by the optimization scheduling module can adapt to future changes.

[0119] Finally, a corresponding control module is constructed, which can generate corresponding scheduling instructions according to the optimized scheduling plan generated by the optimized scheduling module, adjust the operating status of each energy medium in real time, and ensure the efficient and stable operation of the entire system.

[0120] As a further explanation, when the microgrid monitoring subsystem 140 formed based on the above solution is implemented, it is preferably deployed locally. The local deployment method can maximize the response speed of the system and ensure the safe operation of the system.

[0121] Specifically, it is preferred to build a FusionSever Pro 2288X V5 server in a local computer room of the project, and run the microgrid monitoring subsystem 140 in the server, thereby realizing the local deployment of an integrated off-grid dispatching and management system for photovoltaic storage and diesel.

[0122] The integrated off-grid dispatching and management system of photovoltaic, energy storage and diesel formed by such deployment, in cooperation with the photovoltaic power generation subsystem 110, the energy storage subsystem 120 and the diesel power generation subsystem 130, can realize the reading of energy storage, photovoltaic and diesel generator set data through energy management machine and intelligent power monitoring terminal by using various protocols, establish visual monitoring and management, monitor daily power load, real-time power of energy storage cabinet, power generation of photovoltaic panels and power generation of diesel generator, and adjust system output and operation mode in real time.

[0123] The photovoltaic power generation subsystem 11 uses solar panels to convert solar energy into electrical energy and is a core component that provides renewable energy in the entire system. The photovoltaic power generation subsystem 110 converts direct current into alternating current through an inverter to meet the power demand in an off-grid environment.

[0124] The energy storage subsystem 120 is used to store excess electrical energy so as to provide a stable power supply when there is insufficient sunlight or when the power demand is at a peak. The energy storage subsystem 120 is connected to the power grid through a bidirectional converter to achieve charge and discharge management of electrical energy.

[0125] The diesel generator subsystem 130 is used to provide backup power when the photovoltaic and energy storage systems cannot meet the power demand. The diesel generator generates electricity by burning diesel to ensure the continuity of power supply.

[0126] The photovoltaic, storage and diesel integrated off-grid dispatching and management system achieves efficient connection and coordination with the above three subsystems through an intelligent control unit, and can dynamically adjust the operation mode and power output of each subsystem according to factors such as real-time power demand, weather conditions, and energy storage status. During the day when there is plenty of sunshine, the photovoltaic power generation subsystem 110 will work first, and the excess power will be stored in the energy storage subsystem 120; at night or on rainy days, the energy storage subsystem 120 will release the stored power to supplement the photovoltaic system; when both the photovoltaic and energy storage systems cannot meet the demand, the diesel power generation subsystem 130 will start to ensure the stability of power supply.

[0127] The system can monitor the daily power load in real time, and accurately monitor the real-time power of the energy storage cabinet, the power generation of the photovoltaic panels, and the power generation of the diesel generator. In addition, the system also has the ability to adjust its output and operation mode in real time to ensure the efficient and stable operation of the entire power system.

[0128] Specifically, the system first obtains the operating data of energy storage equipment, photovoltaic systems and diesel generator sets in real time through various sensors and data acquisition equipment. These data include but are not limited to the charging and discharging status of energy storage equipment, the remaining battery power, the real-time power generation of photovoltaic panels, and the operating status and power generation of diesel generators. Through these data, the system can have a comprehensive understanding of the operating status of the entire power system.

[0129] Next, the system uses advanced data processing and analysis technology to integrate and analyze the collected data to form a visual monitoring interface. This interface can intuitively display the operating status and key parameters of each device, such as real-time power, power generation, load demand, etc. Through this visual approach, managers can easily monitor and manage the entire power system and promptly discover and resolve potential problems.

[0130] In order to further improve the flexibility and response speed of the system, the system also has an intelligent scheduling function. According to the real-time monitored power load and the operating status of each power generation equipment, the system can automatically adjust the output of each device to achieve the best operating efficiency. When the lighting conditions are good, the system will give priority to using photovoltaic panels to generate electricity, reducing the operating time of diesel generators, thereby reducing fuel consumption and operating costs. In the case of poor lighting conditions or high power load, the system will increase the output of diesel generators and even start energy storage devices for discharge to ensure stable power supply.

[0131] In addition, the system has multiple operating modes that can be switched according to different application scenarios and needs. At night or in rainy weather, the system can switch to energy storage priority mode and use energy storage equipment to meet electricity demand. During peak hours, the system can switch to diesel generation priority mode to ensure the reliability of power supply.

[0132] The photovoltaic-energy storage-diesel multi-energy complementary microgrid system formed based on the above solution realizes the intelligence and networking of equipment. Through the Internet of Things platform, the system can realize remote monitoring and control, and managers can effectively manage the power system without going to the site. In addition, the system also uses big data analysis technology. Through the analysis of historical data, it can predict future electricity demand and power generation, so as to make scheduling plans in advance; the whole system also has good scalability and compatibility, and can easily connect to new equipment and systems to adapt to changing technology and market needs.

[0133] See also Figure 2 The photovoltaic-energy storage-diesel-generator multi-energy complementary microgrid system based on the above scheme can be configured with different operating modes according to different working conditions during operation.

[0134] Preferably, the following operation modes are specifically adopted in the solution of the present invention:

[0135] During the day when there is light:

[0136] 1) If the photovoltaic power generation power is greater than the load power, the microgrid monitoring subsystem 140 controls the photovoltaic subsystem 110 to supply power to the load, and the energy storage subsystem 120 stores excess power;

[0137] 2) If the photovoltaic power generation power is less than the load power, the microgrid monitoring subsystem 140 controls the photovoltaic subsystem 110 and the energy storage subsystem 120 to jointly supply power to the load.

[0138] At night or on a cloudy day, when there is no sunlight:

[0139] 1) If the output power of the energy storage subsystem 120 is greater than the load power, and the remaining power ratio (SOC) of the energy storage subsystem 120 is higher than the upper limit, the microgrid monitoring subsystem 140 controls the energy storage subsystem 120 to independently supply power to the load;

[0140] 2) If the output power of the energy storage subsystem 120 is less than the load power, or the SOC is lower than the lower limit, the microgrid monitoring subsystem 140 controls the diesel generator 131 to start automatically and always operate at the best working efficiency. At the same time, the energy storage subsystem 120 is controlled to act as a regulating load. When the SOC of the energy storage subsystem 120 reaches the upper limit and the rated output power can meet the load demand, the diesel generator 131 is controlled to shut down and switch to independent power supply for the energy storage subsystem 120.

[0141] The photovoltaic-energy storage-diesel generator multi-energy complementary microgrid system provided by the present invention is further described below through specific application examples.

[0142] Here we take the construction of centralized photovoltaic power stations in remote areas such as deserts, Gobi, and wastelands as an example. The communication signal coverage in this example is difficult, and there is no city power access in the surrounding area. In order to ensure on-site electricity, this example adopts a design combining photovoltaic storage and diesel solutions. In the early stage, the photovoltaic array in front of the command center is given priority, combined with the energy storage system and diesel generator to form a photovoltaic storage and diesel multi-energy complementary off-grid power supply system.

[0143] Specifically, refer to Figure 1 The photovoltaic-storage-diesel microgrid system in this example uses 69 strings and 1932 660W photovoltaic panels, which can generate 990kW of electricity at peak. By configuring three 300kW smart photovoltaic inverters, the direct current generated by photovoltaics is converted into 800V alternating current, and enters the box-type substation through three separately laid AC cables. Each inverter can be independently powered.

[0144] Furthermore, the solar-storage-diesel microgrid system in this example is equipped with two 800kW diesel generators, one connected to the solar-storage-diesel system and the other as a backup power source. The diesel generator connected to the system is equipped with a synchronous control cabinet, which allows the diesel generator to automatically follow the voltage, frequency and phase of the energy storage.

[0145] On this basis, this example configures two isolation transformers in the box-type substation. One is connected between the photovoltaic combiner cabinet and the photovoltaic incoming line cabinet and is configured to reduce the voltage output by the photovoltaic inverter to 400V. The other is connected between the energy storage combiner cabinet and the energy storage incoming line cabinet for isolation protection.

[0146] Furthermore, in this example, the photovoltaic incoming cabinet, diesel generator incoming cabinet, outgoing cabinet and energy storage incoming cabinet adopt a shared busbar design.

[0147] With this setup, the electricity generated by photovoltaics first enters the photovoltaic junction cabinet, is stepped down to 400V by an isolation transformer, and then is output to the office building and living area by the outgoing cabinet. At the same time, the excess electricity is used to charge the energy storage battery through the energy storage incoming cabinet and the junction cabinet.

[0148] For the multi-energy complementary microgrid deployed above, this example further deploys a microgrid monitoring subsystem based on the Internet of Things and big data technology. Through logical combination calculations, it achieves energy planning and actual management, energy metering result management, energy quality management, and energy report management, and gradually establishes a multi-energy medium collaborative optimization scheduling model.

[0149] In this example, when deploying the microgrid monitoring subsystem, a FusionSever Pro2288X V5 server is built in the project computer room, and the corresponding microgrid monitoring subsystem is run in the server. This realizes local deployment to form an integrated off-grid dispatching and management system for photovoltaic, storage and diesel. Through the energy management machine and the intelligent power monitoring terminal, various protocols can be used to read the data of energy storage, photovoltaic and diesel generator sets, establish visual monitoring and management, monitor daily power loads, real-time power of energy storage cabinets, power generation of photovoltaic panels, power generation of diesel generators, and adjust the system output and operation mode in real time. The local deployment of the system can maximize the response speed of the system and ensure the safety of system operation.

[0150] In this example, the photovoltaic, storage and diesel multi-energy complementary microgrid system constructed above is deployed on site through the following construction methods:

[0151] In this example, the entire construction process includes the photovoltaic component installation steps, energy storage equipment installation steps, box-type substation installation steps, diesel generator set installation steps, cable construction steps, control system construction steps, system debugging steps, and system trial operation steps.

[0152] The installation steps of photovoltaic modules involve key links such as module selection, bracket construction, module fixation and electrical connection; operations must be carried out strictly in accordance with design drawings and relevant technical specifications to ensure the installation accuracy and safety of photovoltaic modules.

[0153] The installation steps of energy storage equipment include the transportation of battery modules, determination of installation location, fixation of battery modules, and configuration of electrical connections and monitoring systems. Special attention is paid to the safety and stability of battery modules to ensure the efficient operation of energy storage systems.

[0154] The installation steps of box-type substation involve transportation of substation, preparation of foundation, positioning and fixing of substation, installation of electrical equipment and commissioning of protection and control system. Ensure the installation accuracy of substation and reliability of electrical connection to ensure stable power supply of the whole system.

[0155] The installation steps of diesel generator sets include the transportation of generator sets, pouring of foundations, positioning and fixing of generator sets, installation of exhaust and cooling systems, and commissioning of electrical connections and control systems. Pay special attention to the installation environment and ventilation conditions of the generator sets to ensure efficient operation and long-term stability of the generator sets.

[0156] The cable construction steps involve the selection of cables, planning of laying paths, laying and fixing of cables, making and connecting joints, and marking and protecting cables. Operations must be carried out strictly in accordance with electrical specifications to ensure the safety and reliability of cable construction.

[0157] The control system construction steps include the selection of the control system, the installation of the control cabinet, the arrangement of sensors and actuators, and the programming and debugging of the control system. Special attention is paid to the stability and response speed of the control system to ensure the intelligence and automation level of the system.

[0158] The system debugging steps involve joint debugging, functional testing, performance testing and safety testing of each subsystem. Strictly follow the debugging procedures to ensure that the overall performance of the system meets the design requirements.

[0159] The system trial operation steps include preparation before the trial operation, monitoring and adjustment during the trial operation, and evaluation and summary after the trial operation. Special attention is paid to the stability and reliability of the system to ensure that the system reaches the best state before formal operation.

[0160] Based on this construction plan, in this example, the following optimization settings are further adopted when deploying the photovoltaic, storage and diesel multi-energy complementary microgrid system:

[0161] (1) The verticality of the support foundation pile body meets the requirements of 10mm / m and the total height is 20mm. For the verticality of each group of piles, the piles that do not meet the requirements of visual verticality are measured and measured using a digital electronic ruler.

[0162] (2) The deviation of the support foundation pile position meets ±30mm. Check at the top of the pile. Draw a straight line between the top of the first pile and the top of the fifth pile, and then measure the distance between the piles along the straight line.

[0163] (3) The exposed length of the support foundation pile meets the design requirements and is measured from the top of the pile to the lowest point of the exposed pile.

[0164] (4) Measure the distance between different strings and ensure that the string spacing meets the design requirements.

[0165] (5) The elevation deviation of the support foundation pile top should meet the requirement of 0 to -10 mm. Check at the top of the pile. Pull a straight line between the top of the first and fifth piles and observe the vertical distance between the top of the three middle piles and the straight line.

[0166] (6) The soil around the support foundation piles is dense and there are no gaps.

[0167] (7) The bracket purlins should be connected to the purlin supports at the same hole position, and the straightness deviation of the purlins should comply with ±2mm.

[0168] (8) The installation angle of the bracket longitudinal beam should meet the design requirements, and the deviation should not exceed ±1°.

[0169] (9) The installation torque of the bracket bolts should meet the design requirements.

[0170] (10) For open-laid grounding wires, the entire length or section of the conductor and the surface near each connection point should be painted with green and yellow stripes of equal width of 15mm to 100mm. At the same time, two-color tape should be used, and the neutral wire should be painted light blue.

[0171] (11) The grounding of electrical equipment should be connected separately to the grounding mother coin or grounding grid to avoid connecting two or more electrical equipment that need to be grounded in series in one grounding wire.

[0172] (12) The metal support of the ground photovoltaic array should be reliably connected to the grounding grid on the site.

[0173] (13) The inverter bracket is installed firmly and securely to prevent the inverter from falling or becoming unstable due to damage from external forces.

[0174] (14) The space between the inverter and the bracket should be reasonably adjusted to facilitate installation, maintenance and replacement.

[0175] (15) Ensure the normal operation of electrical components, including circuit breakers, contactors, signal lights, etc.

[0176] (16) Avoid loose or falling wiring and short circuit.

[0177] In this example, the following operation and maintenance solution is further adopted for the deployed photovoltaic, storage and diesel multi-energy complementary microgrid system.

[0178] Energy storage configuration in this example system:

[0179] In this example, 69 strings with a total of 1,932 photovoltaic panels are deployed and connected to a self-use solar-storage-diesel system.

[0180] The number of components selected here is calculated using the following formula to ensure the accuracy of the number used:

[0181] E*γ / (P*h)=n;

[0182] E-average daily power consumption;

[0183] P-PV module power;

[0184] h-equivalent full load generating hours;

[0185] γ - overmatching coefficient.

[0186] At the same time, the charging, discharging and configuration of the energy storage battery are determined by the following methods:

[0187] During the day, photovoltaic power supplies the load, and the excess is used to charge the energy storage battery. When the SOC of the energy storage battery reaches SOCmax, charging stops. The charging capacity of the energy storage battery is:

[0188] EES,ch=max[EL,D-(EPV+EG)]

[0189] Where: EES,ch is the charging capacity of the energy storage battery (negative value); EL,D is the power required by the daytime load (positive value); EPV is the power provided by photovoltaic power generation (positive value); EG is the power provided by the diesel generator (can be 0 or positive value).

[0190] At night, the load power supply demand comes from the diesel generator and the energy storage battery. When the SOC of the energy storage battery reaches SOCmin, the discharge stops. The discharge amount of the energy storage battery is:

[0191] EES,dis=max(EL,N-EG)

[0192] Where: EES,dis is the discharge power of the energy storage battery (positive value); EL,N is the power required by the night load (positive value); EG is the power provided by the diesel generator (positive value).

[0193] On this basis, see Figure 3 , which shows the daily irradiance variation diagram of the system solution deployment area in this example.

[0194] Based on this, based on the hourly load demand changes on site and applying boundary condition analysis, it is calculated that the charge and discharge capacity of the energy storage battery in this example is configured between 650kWh and 750kWh, thereby ensuring that the electricity is in the best reliability state.

[0195] Furthermore, based on the setting condition of DOD=85%, in this example, the system is configured with 4 200kWh energy storage cabinets, each of which is equipped with 12 groups of lithium iron phosphate batteries, which can store a total of 800 kWh of electricity.

[0196] Monitoring system debugging in this example system:

[0197] Based on the server built on site, the data is transmitted to the energy storage PCS equipment to adjust the charging and discharging power of the energy storage. At the same time, the diesel generator synchronization control cabinet port is connected through the 485 serial port communication, thereby realizing automatic start and shutdown and accurately controlling the timing of diesel generator intervention, with a response time of less than 50ms.

[0198] The interactive platform of the monitoring system displays the real-time data and operating status of key equipment such as energy storage, inverters, diesel generators, electric meters, circuit breakers, etc. through BS mode, realizes off-grid operation control of photovoltaic storage and diesel, ensures stable operation of the power grid in the region, improves the self-consumption rate of photovoltaic power generation, and maximizes the energy storage benefits through optimized scheduling.

[0199] The later operation and maintenance of this instance system:

[0200] According to the operating environment and working conditions of the system deployment, in this example, for every 200 cumulative hours of operation of the diesel generator set, maintenance operations such as filter element replacement and filter replacement are required. Under the conditions of applying the photovoltaic, storage and diesel multi-energy complementary microgrid solution, the average daily operating time of the diesel generator is about 5 hours, and the maintenance cycle can be extended from 8 days to 40 days, which greatly reduces the frequency of maintenance and reduces the maintenance cost.

[0201] This example compares the deployment of a photovoltaic, storage and diesel multi-energy complementary microgrid system with conventional diesel generator power generation, and can achieve the following unexpected beneficial effects:

[0202] (1) Compared with the conventional diesel generator power supply solution, this example uses a photovoltaic, storage and diesel multi-energy complementary microgrid system power supply solution, which greatly reduces the average daily fuel consumption, reduces the number of diesel generator maintenance times, and reduces maintenance costs.

[0203]

[0204] (2) Compared with the conventional diesel generator power supply solution, this example uses a photovoltaic, storage and diesel multi-energy complementary microgrid system power supply solution, with a maximum daily power generation capacity of 990 kW and a daily renewable energy consumption of about 4000 kW·h, accounting for 80% of the total daily electricity consumption, reducing carbon dioxide emissions by 7.57 tons / day, with very significant social and economic benefits.

[0205] (3) This example uses a photovoltaic, storage, and diesel multi-energy complementary microgrid system power supply solution, which can effectively improve the efficiency of diesel generators while meeting the power supply capacity and power supply reliability requirements, greatly saving energy expenditures during project construction, reducing carbon emissions, and improving the working environment. In addition, since the intervention time of diesel generators is greatly shortened, noise control around the living area can be achieved, improving the rest environment for project managers.

[0206] (4) This example uses a photovoltaic, storage and diesel multi-energy complementary microgrid system power supply solution. In actual application, it can be applied to the construction of living and office power supply systems for photovoltaic new energy projects in off-grid conditions in deserts, Gobi, wastelands, isolated islands, overseas and other areas, and it has great guiding significance for the operation and control of microgrids.

[0207] The above shows and describes the basic principles, main features and advantages of the present invention. It should be understood by those skilled in the art that the present invention is not limited to the above embodiments, and the above embodiments and descriptions are only for explaining the principles of the present invention. Without departing from the spirit and scope of the present invention, the present invention may have various changes and improvements, which fall within the scope of the present invention to be protected. The scope of protection of the present invention is defined by the attached claims and their equivalents.

Claims

1. A photovoltaic, storage and diesel multi-energy complementary microgrid system, which is deployed in areas without city electricity and is characterized by: Including photovoltaic sub-arrays, several photovoltaic inverters, several transformers, energy storage components, diesel generator sets, photovoltaic junction cabinets, energy storage junction cabinets, photovoltaic incoming cabinets, energy storage incoming cabinets, outgoing cabinets, synchronous control cabinets, and diesel generator incoming cabinets; The photovoltaic sub-array is configured to be connected to a photovoltaic combiner cabinet through a plurality of photovoltaic inverters, the photovoltaic combiner cabinet is connected to a photovoltaic incoming line cabinet through a first transformer, and the photovoltaic incoming line cabinet is connected to an outgoing line cabinet; The energy storage assembly is configured to be connected to an energy storage combiner cabinet, the energy storage combiner cabinet is connected to the energy storage incoming cabinet via a second transformer, and the energy storage incoming cabinet is connected to the outgoing cabinet; The diesel generator set is configured to be connected to a diesel generator incoming cabinet through a synchronization control cabinet, and the diesel generator incoming cabinet is connected to an outgoing cabinet.

2. The photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 1 is characterized in that: The photovoltaic incoming cabinet, diesel generator incoming cabinet, outgoing cabinet and energy storage incoming cabinet are directly configured to form a common bus.

3. The photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 1 is characterized in that: The plurality of photovoltaic inverters enter the photovoltaic combiner cabinet through separate AC cables respectively.

4. The photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 1 is characterized in that: The complementary microgrid system is provided with a microgrid monitoring system, and the microgrid monitoring system is configured to perform energy planning and actual management, energy metering result management, energy quality management, and energy report management through logical combination calculations.

5. The photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 4 is characterized in that: The microgrid monitoring system is composed of a data acquisition unit, a communication network unit, a monitoring center unit and a user interaction unit that cooperate with each other; The data acquisition unit is configured to collect real-time data of various devices and nodes in the microgrid; The communication network unit is configured to establish a stable and reliable data transmission channel between the data acquisition unit and the monitoring center unit; The monitoring center unit is configured to process, analyze and support decision making based on the real-time data of each device and node in the microgrid collected by the received data acquisition unit; The user interaction unit is configured to perform data interaction with the monitoring center unit.

6. The photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 1 is characterized in that: The microgrid monitoring system is equipped with a multi-energy medium collaborative optimization scheduling unit, and the multi-energy medium collaborative optimization scheduling unit is configured to analyze and process data of different energy media to form an optimization scheduling plan for different energy media.

7. The photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 6 is characterized in that: The multi-energy medium collaborative optimization scheduling unit is specifically composed of a data acquisition and processing module, an optimization scheduling module, a prediction module and a control module that cooperate with each other; The data acquisition and processing module is configured to collect operating data from different energy media in real time and perform preliminary processing and analysis; The optimization scheduling module is configured to interact with the data acquisition and processing module and the prediction module, and can perform optimization calculations based on the real-time operation data of different energy media processed and analyzed by the data acquisition and processing module, and the future energy demand and supply conditions predicted by the prediction module, so as to generate an optimal scheduling plan; The prediction module is configured to interact with the optimization scheduling module, the processing module and the prediction module to predict future energy demand and supply using historical data and machine learning algorithms; The control module is configured to interact with the optimization scheduling module in data, and can generate scheduling instructions according to the optimal scheduling plan generated by the optimization scheduling module, and schedule the direct synergy of various energy media based on the scheduling instructions.

8. Construction method of photovoltaic, energy storage and diesel multi-energy complementary microgrid system, characterized in that: The method includes, in sequence, photovoltaic component installation steps, energy storage equipment installation steps, box-type substation installation steps, diesel generator set installation steps, cable construction steps, control system construction steps, system debugging steps, and system trial operation steps.

9. The construction method of the photovoltaic-storage-diesel multi-energy complementary microgrid system according to claim 8 is characterized in that: The installation steps of the box-type substation specifically include transportation of the substation, preparation of the foundation, positioning and fixing of the substation, installation of electrical equipment, and debugging of the protection and control system.

10. The construction method of the photovoltaic, energy storage and diesel multi-energy complementary microgrid system according to claim 8 is characterized in that: The installation steps of the diesel generator set include transportation of the generator set, pouring of the foundation, positioning and fixing of the set, installation of the exhaust and cooling systems, and debugging of the electrical connection and control system.

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