A comprehensive energy grid control system

Abstract

The present invention relates to an integrated energy grid control system, and belongs to the technical field of grid energy management and control. The present invention adopts a four-layer architecture, can provide various real-time information for microgrid dispatching, perform dispatching decision management and control on the microgrid, ensure the safe operation of the microgrid, improve the quality of the microgrid and improve the economy of the microgrid operation, and has two normal operation modes of off-grid operation and grid-connected operation and two transient operation modes of off-grid to grid-connected and grid-connected to off-grid. It can not only operate stably in the two normal operation modes, but also ensure the reliability of the two transient operation modes.

Description

Technical Field

[0001] The invention relates to an integrated energy grid control system, belonging to the technical field of grid energy management and control. Background Art

[0002] As a terminal energy unit, the park integrated energy management system based on microgrid complements the large energy network. Through energy dispatching and monitoring, it realizes multi-energy coordination and complementarity, improves the penetration rate of renewable energy, and meets the demand-side response of the power grid; further improves the safety and reliability of the park power supply system; aggregates various micro sources and loads such as distributed renewable power generation, energy storage, and electric vehicles, and flexibly regulates power-type power electronic devices to achieve highly autonomous characteristics, which will form support and interaction with the large power grid; the large power grid fully mobilizes distributed power sources and loads to participate in system peak regulation through the park integrated energy management system, effectively reducing the peak-to-valley difference; the park integrated energy management system can operate independently when the large power grid fails to ensure the power supply of important loads and improve power supply reliability. The smart grid architecture with the large power grid as the backbone and the park microgrid (group) as the body organization will become an important technical application direction for increasing the proportion of clean energy, and an effective form for China to develop renewable energy, making full use of renewable energy generation to adjust the energy structure and give play to the huge potential of renewable energy in my country.

[0003] The massive access of distributed energy and the increasing requirements of users for power quality have brought new challenges to the current distribution system. Microgrid is a new power grid model in recent years. It has essentially changed the topological structure of the single power flow of the traditional radial power grid, and divided the distributed energy and loads connected to the distribution network level into a small whole for unified planning, design, operation control and protection. Microgrid has the advantages of improving power quality, power supply reliability, and operation economy, and can promote the application of distributed power sources. Therefore, it has been widely studied in recent years.

[0004] As a terminal energy unit, the park integrated energy management system based on microgrid complements the large energy network. Through energy dispatching and monitoring, it realizes multi-energy coordination and complementarity, improves the penetration rate of renewable energy, and meets the demand-side response of the power grid; further improves the safety and reliability of the park power supply system; aggregates various micro sources and loads such as distributed renewable power generation, energy storage, and electric vehicles, and flexibly regulates power-type power electronic devices to achieve highly autonomous characteristics, which will form support and interaction with the large power grid; the large power grid fully mobilizes distributed power sources and loads to participate in system peak regulation through the park integrated energy management system, effectively reducing the peak-to-valley difference; the park integrated energy management system can operate independently when the large power grid fails to ensure the power supply of important loads and improve power supply reliability. The smart grid architecture with the large power grid as the backbone and the park microgrid (group) as the body organization will become an important technical application direction for increasing the proportion of clean energy, and an effective form for China to develop renewable energy, making full use of renewable energy generation to adjust the energy structure and give play to the huge potential of renewable energy in my country. Summary of the invention

[0005] The purpose of the present invention is to provide a comprehensive energy grid control system to achieve dispatching decision-making management and control of micro-point networks and ensure the safe operation of micro-grids.

[0006] In order to solve the above technical problems, the present invention provides a comprehensive energy grid control system, which adopts a four-layer architecture, including:

[0007] Computer system layer, the computer system layer includes real-time database, relational database, computer operating system and computer network;

[0008] Support platform, including system resource management module and graphic model library integration module. The system resource management module is used for node monitoring, process monitoring management, file transfer and synchronization. The model library integration module is used for importing and exporting measurement model data, equipment model data, graphics and graphic data, graphic element editing, graphic configuration editing and graphic conversion.

[0009] The monitoring application layer includes a microgrid operation mode control module, which is used for switching the microgrid on-grid and off-grid operation modes, and issues mode switching commands to the distributed power supply and the grid-connected interface device. When switching the on-grid and off-grid operation modes, it selects power outage switching or smooth switching. When a grid failure occurs, it automatically switches from the microgrid on-grid operation control mode to the off-grid operation control mode. After the grid failure is restored, when the microgrid switches from off-grid operation to on-grid operation, the microgrid selects to execute automatically or after receiving the superior instruction;

[0010] The energy management application layer includes a voltage and reactive power management module, which is used to optimize the reactive voltage operation of the microgrid. The reactive voltage operation mode may include: grid-connected point power factor control mode, grid-connected point reactive power control mode, voltage control mode or off-grid reactive balance mode, and a parameter setting value or range is given for the selected control mode.

[0011] The present invention adopts a four-layer architecture, which can provide various real-time information for microgrid scheduling, perform scheduling decision management and control on the microgrid, ensure the safe operation of the microgrid, improve the quality of the microgrid and improve the economy of the microgrid operation. At the same time, it has two normal operation modes of off-grid operation and grid-connected operation and two transient operation modes of off-grid to grid-connected and grid-connected to off-grid. It can not only operate stably in the two normal operation modes, but also ensure the reliability of the two transient operation modes.

[0012] Furthermore, the method adopted by the monitoring application layer when switching between the microgrid and off-grid operation modes is as follows:

[0013] 1) The photovoltaic cell should maintain the MPPT mode. When the photovoltaic cell output is greater than the load consumption and the battery is fully charged, it should work in the constant voltage mode. When the photovoltaic output is less than the load consumption or the photovoltaic output is zero, the battery has energy storage and should work in the discharge mode.

[0014] 2) When the battery energy storage is 0 and the photovoltaic output continues to increase but is less than the load consumption, the battery stops operating; when the photovoltaic output exceeds the microgrid load consumption and the battery is not fully charged, the battery is charged;

[0015] 3) When the photovoltaic output exceeds the microgrid load consumption and works in low-output operation mode, when the load demand continues to increase, the photovoltaic cells and batteries can no longer meet the load power demand, and the micro gas turbine increases the output power. When the photovoltaic power generation ends and the energy storage device stores zero energy, it is completely powered by the micro gas turbine.

[0016] Furthermore, the computer operating system adopts one of Windows, Linux or Unix, and the relational database is one of Oracle, MySQL or SQL Server database.

[0017] Furthermore, the support platform also includes a permission management module, which is used to grant different permissions and permission validity periods to personnel according to different job functions and job natures, including hierarchical permission management, permission binding and permission configuration, and adopts hierarchical management to set user passwords and allocate permissions, and impose password restrictions according to the content involved in the business. All operators should be authorized, undergo identity and permission authentication, and use the specified system functions and operating scope according to the authorized permissions.

[0018] Furthermore, the support platform also includes a database management module, which is used for database maintenance, synchronization, backup and recovery, and provides a unified real-time or quasi-real-time data interface to the outside world, and can perform access control according to permissions and types.

[0019] Furthermore, the support platform also includes a system clock synchronization module and a report processing module. The system clock synchronization module is used to synchronize the time according to the signal received from the satellite positioning system, and thereby synchronize the clocks of related equipment in the station; the report processing module is used to select historical data according to needs and generate reports of different formats and types, and the reports support file export and printing.

[0020] Furthermore, the monitoring application layer includes an anti-error locking module, which has conventional anti-error locking based on predefined rules and anti-error locking functions based on topology analysis, and adopts legal person operation instructions that have been verified for error prevention. When an error occurs, an alarm should be issued and the instruction execution should be locked. The control object scope of the equipment disconnection control is circuit breakers, load switches, disconnectors, grounding switches, main transformer taps and reactive compensation equipment.

[0021] Furthermore, the monitoring application layer also includes an equipment disconnection control module. The equipment disconnection control module has two control modes: automatic control and manual control. The control operation levels are from high to low: local, in-station monitoring and remote control. When the equipment is manually controlled to disconnect, the microgrid monitoring system has an operation monitoring function. The monitoring personnel can implement monitoring on this machine or at another operator station. In the microgrid monitoring system, the disconnection equipment should adopt three steps: selection, return to calibration and execution.

[0022] Furthermore, the energy management application layer includes a power generation prediction module, which is used to predict power generation based on historical data and measured data, receive power generation prediction data from a power prediction system, and configure corresponding wind power generation or photovoltaic power generation prediction functions for microgrid systems that include intermittent power generation forms such as wind power and photovoltaic power generation.

[0023] Furthermore, the energy management application layer also includes a Web function module, which is used for information publishing, browsing and downloading of microgrid related data, and supports the publishing of information, reports and screen information, as well as supports the browsing and downloading of data, reports, screens and graphics within the scope of authority. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the software architecture of the integrated energy grid control system of the present invention;

[0025] Figure 2 It is a diagram of the structure of the integrated energy primary system in the integrated energy grid control system of the present invention;

[0026] Figure 3 It is a hardware architecture design diagram of the integrated energy grid control system of the present invention;

[0027] Figure 4 It is a principle block diagram of the microgrid operation mode in the integrated energy grid control system of the present invention. DETAILED DESCRIPTION

[0028] The specific implementation modes of the invention will be further described below in conjunction with the accompanying drawings.

[0029] The integrated energy grid control system of the present invention adopts a four-layer architecture, such as Figure 1 As shown, it includes computer system layer, support platform, monitoring application layer and energy management application layer. The integrated energy microgrid control system can provide various real-time information for microgrid dispatching, manage and control the dispatching decision of microgrid, ensure the safe operation of microgrid, improve the quality of microgrid and improve the economic efficiency of microgrid operation. It has two normal operation modes of off-grid operation and grid-connected operation and two transient operation modes of off-grid to grid-connected and grid-connected to off-grid. It can not only operate stably in the two normal operation modes.

[0030] Specifically, the computer system layer includes real-time database, relational database, computer operating system and computer network; the supporting platform includes database management module, data acquisition and processing module, system clock synchronization module, system resource management module, graphic model library integration module, authority management module, human-computer interface and report processing module; the monitoring application layer includes anti-mislocking module, equipment disconnection control module, microgrid operation mode control module, sequence control module and power control module; the energy management application layer includes power generation prediction module, distributed power management module, load management module, power consumption plan issuance module, voltage and reactive power management module, statistical analysis and evaluation module and Web function module.

[0031] The computer operating system uses one of Windows, Linux or Unix. Considering the system scale and security requirements, it is recommended to use the Linux system, and the relational database is one of Oracle, MySQL or SQL Server database.

[0032] For the monitoring application layer, the microgrid operation mode control module has the function of switching the microgrid on-grid and off-grid operation modes, such as Figure 2As shown, it has the ability to issue mode switching commands to distributed power sources, grid-connected interface devices and other equipment. When the microgrid is normally switching between grid-connected and off-grid operation modes, the microgrid monitoring system selects power outage switching or smooth switching. When a grid failure occurs, the microgrid monitoring system automatically switches from the microgrid grid-connected operation control mode to the off-grid operation control mode. After the grid failure is restored, when the microgrid switches from off-grid operation to grid-connected operation, the microgrid monitoring system chooses to execute automatically or after receiving superior instructions.

[0033] In the embodiment of the present invention, the on-grid and off-grid method adopted by the integrated energy microgrid control system specifically includes the following steps:

[0034] S1. The photovoltaic cell should maintain the MPPT mode. When the photovoltaic cell output is greater than the load consumption and the battery is fully charged, it should work in the constant voltage mode. When the photovoltaic output is less than the load consumption or the photovoltaic output is zero, the battery has energy storage and should work in the discharge mode.

[0035] S2, when the battery energy storage is 0 and the photovoltaic output continues to increase but is less than the load consumption, the battery stops running; the photovoltaic output exceeds the microgrid load consumption, the battery is not fully charged, and the battery is charged;

[0036] S3. When the photovoltaic output exceeds the microgrid load consumption, it should work in low output operation mode. When the load demand continues to increase, the photovoltaic cells and batteries can no longer meet the load power demand, and the micro gas turbine increases the output power. When the photovoltaic power generation ends and the energy storage device stores zero energy, it is completely powered by the micro gas turbine.

[0037] In an embodiment of the present invention, the anti-error locking module in the monitoring application layer supports conventional anti-error locking based on predefined rules and anti-error locking based on topology analysis. All operation instructions should be verified for anti-error. When an error occurs, an alarm should be issued and the instruction execution should be locked. The control object range of the equipment disconnection control is circuit breakers, load switches, disconnectors, grounding switches, main transformer taps and reactive compensation equipment. The equipment disconnection control module has two control modes: automatic control and manual control. The control operation levels are from high to low: local, in-station monitoring and remote control. When the equipment is disconnected manually, the microgrid monitoring system has an operation monitoring function. The monitoring personnel can implement monitoring at the local machine or another operator station. In the microgrid monitoring system, the disconnection equipment should adopt the three steps of selection, return to calibration and execution.

[0038] In an embodiment of the present invention, the control requirements of the power control module in the monitoring application layer are as follows: the microgrid monitoring system should be able to perform real-time power control on distributed power sources, energy storage, loads, etc. in the microgrid according to the power optimization control instructions or manual set values ​​of the microgrid energy management system.

[0039] Microgrid active power control has the function of controlling the output of various distributed power generation equipment and controlling the charging and discharging of energy storage systems.

[0040] When the microgrid is connected to the grid, the microgrid monitoring system should have the following active power control methods:

[0041] a) Constant tie line active power control.

[0042] b) Track the planned curve control of the contact line.

[0043] c) Energy storage charging and discharging plan curve control.

[0044] When the microgrid is off-grid, the microgrid monitoring system should monitor the active output value of the main power supply. When it exceeds the set value, it should be able to adjust other power supply equipment in the microgrid to ensure that the output of the main power supply is within the normal range.

[0045] Microgrid reactive power control

[0046] The microgrid monitoring system should have the microgrid voltage and reactive power management functions, and should be able to set the microgrid voltage and reactive power operation modes, including power factor control mode, reactive power control mode, voltage control mode, etc.

[0047] In an embodiment of the present invention, the power generation prediction module in the energy management application layer predicts power generation through historical data, measured data, etc., receives power generation prediction data from a power prediction system, and configures corresponding wind power generation or photovoltaic power generation prediction functions for the micro-grid system that includes intermittent power generation forms such as wind power and photovoltaic power generation.

[0048] In an embodiment of the present invention, the voltage reactive power management module in the energy management application layer can optimize the reactive voltage operation of the microgrid. The reactive voltage operation mode may include: grid-connected point power factor control mode, grid-connected point reactive power control mode, voltage control mode or off-grid reactive balance mode, and provide parameter setting values ​​or ranges for the selected control mode. At the same time, the voltage reactive power management has the function of setting the order of reactive compensation equipment input.

[0049] In an embodiment of the present invention, the Web function module in the energy management application layer has the functions of information publishing, browsing and downloading of microgrid related data, and supports the publishing of information, reports and screen information, as well as the browsing and downloading of data, reports, screens and graphics within the scope of authority.

[0050] In the embodiment of the present invention, the sequence control module in the energy management application layer can control the equipment actions in the microgrid according to a preset sequence and process, and the basic functions to be implemented include grid-connected startup, grid-connected shutdown, black start, off-grid shutdown, etc.

[0051] Grid-connected startup: close the grid-connected switch, input various power sources and loads, and control the microgrid to smoothly transition from the shutdown state to the grid-connected operation state; grid-connected shutdown: exit various power sources and loads, disconnect the grid-connected switch, and control the microgrid to smoothly transition from the grid-connected operation state to the shutdown state; black start: input power and load, and control the microgrid to smoothly transition from the shutdown state to the off-grid operation state; off-grid shutdown: exit power and load, and control the microgrid to smoothly transition from the off-grid operation state to the shutdown state.

[0052] The supporting platform includes database management module, data acquisition and processing module, system clock synchronization module, system resource management module, image and model library integration module, authority management module, human-computer interface and report processing module.

[0053] The system resource management module is used for node monitoring, process monitoring management, and file transfer and synchronization; the graphic model library integration module is used for the import and export of measurement model data, equipment model data, graphics and metadata. The graphic model library integration is used for graphic element editing, graphic configuration editing and graphic conversion, and supports the conversion function between system private graphics and SVG graphics, and supports the conversion function between system private graphics and G language graphics; the authority management module is used to grant different permissions and authority validity periods to personnel according to different job functions and job natures, including hierarchical authority management, authority binding and authority configuration, and adopts hierarchical management to set user passwords and allocate permissions, and impose password restrictions according to the content involved in the business. All operators should be authorized, undergo identity and authority authentication, and use the specified system functions and operating scope according to the authorized authority.

[0054] In the embodiment of the present invention, the requirements for the data collection and processing module in the support platform to be able to collect data in real time are as follows:

[0055] The grid connection point data requirements include:

[0056] a) Location information of the circuit breaker, disconnector and earthing switch.

[0057] b) Location information of main transformer tap changer.

[0058] c) Working status of the grid connection point.

[0059] d) Active and reactive power at the grid connection point.

[0060] e) Three-phase voltage, three-phase current, active power, reactive power, power factor, power quality and grid frequency at the grid connection point.

[0061] Distributed generation measurement data requirements include:

[0062] a) Photovoltaic measurement data:

[0063] 1) Photovoltaic module measurement data: DC side current, DC side voltage, DC side power, and photovoltaic module temperature;

[0064] 2) Photovoltaic inverter measurement data: three-phase voltage, three-phase current, active power, reactive power, power factor, and frequency.

[0065] b) Wind power generation measurement data:

[0066] Wind power generation output voltage, output current, active power, power factor, output frequency.

[0067] c) Diesel generator measurement data:

[0068] Generator output voltage, generator output current, active power, reactive power, power factor, frequency, total power generation, speed, diesel fuel consumption, diesel engine temperature.

[0069] d) Micro gas turbine (gas internal combustion engine) measurement data:

[0070] Gas turbine output voltage, gas turbine output current, active power, reactive power, power factor, frequency, thermal power, daily heat supply, total heat supply, daily power generation, total power generation, speed, gas turbine gas consumption.

[0071] Storage energy measurement data requirements include:

[0072] a) Battery measurement data: DC current, DC voltage, DC power, total remaining capacity, battery temperature.

[0073] b) Energy storage inverter measurement data: three-phase voltage, three-phase current, active power, reactive power, power factor, and frequency.

[0074] c) Active power and reactive power.

[0075] Load measurement data requirements include:

[0076] Three-phase voltage, three-phase current, active power, reactive power, power factor, active power, reactive power.

[0077] Reactive power compensation equipment measurement data requirements include:

[0078] Three-phase voltage, three-phase current, reactive power.

[0079] Meteorological and other data requirements include:

[0080] Ambient temperature, humidity, atmospheric pressure, total irradiance, wind speed and direction.

[0081] It should have the functions of calculating and analyzing the collected data information. The data analysis functions include but are not limited to:

[0082] Data source selection, automatic calculation cycle, etc., statistics by day, month, quarter, year or custom time period;

[0083] Statistics of the maximum, minimum, average and cumulative values ​​of the specified quantity, the statistical period includes year, month, day, hour, etc.;

[0084] Logical calculation of multiple position signals and status signals;

[0085] Statistics of position change, control, remote adjustment and other operation times;

[0086] Statistics of remote control accuracy and remote adjustment response accuracy;

[0087] Statistical analysis of voltage and current over-limit, power factor and power quality pass rate.

[0088] It should have the function of checking the rationality of the collected data information and issuing over-limit alarms, including but not limited to:

[0089] Data integrity check: automatically filter bad data and automatically set data quality labels;

[0090] Set limits: support different limits for different time periods;

[0091] Alarm: alarm definition, alarm action, alarm diversion, screen call and alarm information storage, etc.

[0092] It should have the function of storing collected data information, including but not limited to:

[0093] Categorize, store and manage raw data and application data;

[0094] Stores event sequence records and operation records.

[0095] In an embodiment of the present invention, the human-machine interface in the support platform includes:

[0096] The real-time monitoring screen should support system main wiring diagram, network diagram, geographical distribution map, operating condition diagram and communication network diagram, etc. Graphic display methods include trend chart, bar chart, pie chart, etc.

[0097] It supports multi-screen display, multi-window graphics, stepless zooming, roaming, dragging, layered and graded display, etc.

[0098] It should have a graphic modeling tool with an integrated module of graphic model library, a network topology management tool, support for user-defined equipment graphics and interval templates, and support for copying various graphics with model attributes.

[0099] State management should support the management and monitoring of software modules, network operating status and operations.

[0100] It should have alarm functions in the form of graphics, voice, text, printing, etc., and support alarm query, customized alarm level, alarm statistical analysis, alarm confirmation and clearing, and main event sequence display.

[0101] The operation and control should be able to realize manual setting, sign operation, locking and unlocking operation, remote control and adjustment functions, and should have corresponding authority control; it should have the function of querying and accessing the collected data, and the function of querying by combined conditions.

[0102] The microgrid monitoring system should be able to give its parameter setting value or range for the selected reactive voltage transmission mode, including voltage limit, reactive power limit, power factor limit, dead zone, time limit, slope, etc.

[0103] In the embodiment of the present invention, the distributed power management module in the energy management application layer has the function of performing corresponding fuel management on the gas turbine, diesel engine and other power generation devices in the microgrid, including statistics on fuel consumption, calculation and display of remaining fuel, and fuel inventory warning. It has the function of managing the maintenance status of the power generation equipment in the microgrid, including the maintenance listing of the power generation equipment, the setting of the maintenance time, etc. It has the function of managing the state of charge of the energy storage system in the microgrid, and it should be able to warn when the energy storage charge state is too high / too low. It has the function of setting the main power supply in the microgrid. For microgrids with multiple microgrids that can operate as the main power supply, it should be able to set the corresponding standby order for each standby main power supply.

[0104] In the embodiment of the present invention, the load management module in the energy management application layer classifies and manages the loads according to the user's requirements for power supply reliability and the losses or impacts caused by power outages on personal safety, microgrid operation safety, and the economy. It can pre-formulate load switching strategies and plans for different working conditions of the microgrid according to load classification; it is equipped with a load forecasting function; it can manage load power consumption according to real-time load monitoring data and load power consumption plans; when the microgrid is off-grid, it can implement power restriction strategies for each load terminal, which may include control rounds, control time periods, power settings, power settings, etc., and send them to the monitoring system for execution.

[0105] In the embodiment of the present invention, the power consumption plan issuance module in the energy management application layer arranges the power generation plan, energy storage charging and discharging plan, and load power consumption plan of each distributed power source through optimization calculation according to the remote scheduling plan, power generation load forecast data, microgrid real-time operation data, power supply and load characteristics, and operation constraints. It is advisable to include the day-ahead power generation and power consumption plan and the day-ahead power generation and power consumption plan. The power generation and power consumption plan should be able to arrange the output power for 24 hours from 0:00 the next day, with a time resolution of no more than 1 hour, and it is advisable to roll the output power for the next 4 hours, with a time resolution of no more than 15 minutes. The power generation plan can be arranged in two ways: manual input and automatic generation.

[0106] In the embodiment of the present invention, the statistical analysis and evaluation module in the energy management application layer includes resource analysis, energy exchange analysis, energy consumption and benefit analysis, reliability analysis, power quality analysis, etc.

[0107] For microgrids that use wind power or photovoltaic power as their main energy sources, resource analysis can be performed based on wind energy resources and solar energy resource monitoring data. Statistical analysis can be performed on the power generation, power consumption, and energy storage systems within the microgrid, as well as the exchange of electrical energy between the microgrid and external systems. Analyze the energy consumption and benefits of the microgrid system operation, and have functions such as energy consumption analysis, energy saving analysis, cost accounting, and benefit analysis. It has the function of analyzing the reliability of microgrid power supply, including power supply reliability, annual power outage time, and annual power outage times. Perform wind and solar resource utilization analysis based on resource monitoring data and actual power generation and consumption data. Perform power quality analysis on the grid-connected points of grid-connected microgrids.

[0108] Depend on Figure 3 As shown in the figure, the comprehensive energy system highly integrates the transformation, distribution, use, light, storage, charging and discharge subsystems to achieve local consumption of distributed clean energy power generation, economical electricity use, smoothing of peak and valley differences in the grid interface, improved grid-side energy efficiency, and friendly interactive response with the demand side of the grid system dispatch. At the same time, the flexible adjustment capability of the power electronic device also has the functions of regulating power quality such as regulating reactive power and harmonic suppression.

[0109] Computer controlled secondary system composition

[0110] like Figure 4 As shown in the figure, the system needs to be equipped with front-end servers, data servers, application servers, workstations, switches / routers and other equipment. The number of servers and workstations can be reasonably increased or decreased according to the scale of the microgrid and the amount of computing. In order to improve the reliability of the system, the master-slave hot standby mode of computers and network equipment can be adopted.

[0111] The system should be equipped with security protection equipment such as firewalls and isolation devices, and network security protection should comply with the requirements of GB / T 20270 and other regulations.

[0112] The data acquisition communication network connects distributed power supply controllers, load controllers, measurement and control protection equipment, central controllers, grid-connected interfaces and other equipment.

[0113] The internal communication of the system should adopt Ethernet communication, optical fiber communication, 485, etc., and the communication protocol should adopt DL / T634.5101, DL / T634.5104 and DL / T860 communication protocols. The communication between the power grid dispatching organization should adopt Ethernet communication and optical fiber communication, and the communication and protocol should adopt DL / T634.5101, DL / T634.5104 and DL / T860 communication protocols.

[0114] The present invention can provide various real-time information for microgrid scheduling, perform scheduling decision management and control on the microgrid, ensure the safe operation of the microgrid, improve the quality of the microgrid and improve the economy of the microgrid operation. At the same time, it has two normal operation modes of off-grid operation and grid-connected operation and two transient operation modes of off-grid to grid-connected and grid-connected to off-grid. It can not only operate stably in the two normal operation modes, but also ensure the reliability of the two transient operation modes.

[0115] The present invention adopts a microgrid core secondary device that integrates protection, safe and stable control, and cloud interaction to study resource monitoring technology, container technology and distributed application publishing technology, microgrid distributed protection technology, microgrid stability control technology, etc. for distributed new energy, to achieve stable and reliable operation of the microgrid, ensure the power supply of key equipment and efficient access to distributed energy, and form a new type of intelligent microgrid controller practical product. The comprehensive energy microgrid control system, through panoramic monitoring of energy consumption in the park, builds an energy management and control platform, realizes panoramic monitoring of energy flow of source, network, load, storage, and vehicle, and can intuitively display the real-time power generation status of each type of new energy, the flow of energy medium pipeline network, energy loss, real-time energy consumption, energy equipment operation, etc. to achieve efficient integration of information resources.

[0116] Meanwhile, the contents not described in detail in this specification belong to the prior art known to those skilled in the art.

[0117] It should be noted that, in the present invention, relational terms such as first and second, etc. are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Moreover, the terms "include", "comprise" or any other variants thereof are intended to cover non-exclusive inclusion, so that a process, method, article or device including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or device.

[0118] Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions and variations may be made to the embodiments without departing from the principles and spirit of the present invention, and that the scope of the present invention is defined by the appended claims and their equivalents.

Claims

1. A comprehensive energy grid control system, characterized in that: The control system adopts a four-layer architecture, including: Computer system layer, the computer system layer includes real-time database, relational database, computer operating system and computer network; Support platform, including system resource management module and graphic model library integration module. The system resource management module is used for node monitoring, process monitoring management, file transfer and synchronization. The graphic model library integration module is used for importing and exporting measurement model data, equipment model data, graphics and graphic data, graphic element editing, graphic configuration editing and graphic conversion. The monitoring application layer includes a microgrid operation mode control module, which is used for switching the microgrid on-grid and off-grid operation modes, and issues mode switching commands to the distributed power supply and the grid-connected interface device. When switching the on-grid and off-grid operation modes, it selects power outage switching or smooth switching. When a grid failure occurs, it automatically switches from the microgrid on-grid operation control mode to the off-grid operation control mode. After the grid failure is restored, when the microgrid switches from off-grid operation to on-grid operation, the microgrid selects to execute automatically or after receiving the superior instruction; The energy management application layer includes a voltage and reactive power management module, which is used to optimize the reactive voltage operation of the microgrid. The reactive voltage operation mode may include: grid-connected point power factor control mode, grid-connected point reactive power control mode, voltage control mode or off-grid reactive balance mode, and a parameter setting value or range is given for the selected control mode; The method adopted by the monitoring application layer when switching the microgrid on-grid and off-grid operation mode is as follows: 1) The photovoltaic cell should maintain the MPPT mode. When the photovoltaic cell output is greater than the load consumption and the battery is fully charged, it should work in the constant voltage mode. When the photovoltaic output is less than the load consumption or the photovoltaic output is zero, the battery has energy storage and should work in the discharge mode. 2) When the battery energy storage is 0 and the photovoltaic output continues to increase but is less than the load consumption, the battery stops operating. When the photovoltaic output exceeds the microgrid load consumption and the battery is not fully charged, the battery is charged; 3) When the photovoltaic output exceeds the microgrid load consumption and works in low-output operation mode, when the load demand continues to increase, the photovoltaic cells and batteries can no longer meet the load power demand, and the micro gas turbine increases the output power. When the photovoltaic power generation ends and the energy storage device stores zero energy, it is completely powered by the micro gas turbine.

2. The integrated energy grid control system according to claim 1, characterized in that: The computer operating system adopts one of Windows, Linux or Unix, and the relational database adopts one of Oracle, MySQL or SQL Server database.

3. The integrated energy grid control system according to claim 1, characterized in that: The support platform also includes a permission management module, which is used to grant different permissions and permission validity periods to personnel according to different job functions and job natures, including hierarchical permission management, permission binding and permission configuration, and adopts hierarchical management to set user passwords and allocate permissions, and impose password restrictions according to the content involved in the business. All operators must be authorized, undergo identity and permission authentication, and use the specified system functions and operating scope according to the authorized permissions.

4. The integrated energy grid control system according to claim 3, characterized in that: The support platform also includes a database management module, which is used for database maintenance, synchronization, backup and recovery, and provides a unified real-time or quasi-real-time data interface to the outside world, and can perform access control according to permissions and types.

5. The integrated energy grid control system according to claim 3, characterized in that: The support platform also includes a system clock synchronization module and a report processing module. The system clock synchronization module is used to synchronize the time according to the signal received from the satellite positioning system, and thereby synchronize the clocks of related equipment in the station; the report processing module is used to select historical data according to needs and generate reports of different formats and types, and the reports support file export and printing.

6. The integrated energy grid control system according to claim 1, characterized in that: The monitoring application layer includes an anti-error locking module, which is based on conventional anti-error locking based on predefined rules and anti-error locking functions based on topology analysis. It adopts legal person operation instructions that have been verified for anti-error. When an error occurs, an alarm should be issued and the instruction execution should be locked. The control object scope of the equipment disconnection control is circuit breakers, load switches, disconnectors, grounding switches, main transformer taps and reactive compensation equipment.

7. The integrated energy grid control system according to claim 6, characterized in that: The monitoring application layer also includes an equipment disconnection control module. The equipment disconnection control module has two control modes: automatic control and manual control. The control operation levels are from high to low: local, in-station monitoring and remote control. When the equipment is disconnected manually, the microgrid monitoring system has an operation monitoring function. The monitoring personnel can implement monitoring on this machine or at another operator station. In the microgrid monitoring system, the disconnection equipment should adopt three steps: selection, return to calibration and execution.

8. The integrated energy grid control system according to claim 1, characterized in that: The energy management application layer includes a power generation prediction module, which is used to predict power generation based on historical data and measured data, receive power generation prediction data from a power prediction system, and configure corresponding wind power generation or photovoltaic power generation prediction functions for microgrid systems that include intermittent power generation such as wind power and photovoltaic power generation.

9. The integrated energy grid control system according to claim 8, characterized in that: The energy management application layer also includes a Web function module, which is used for information publishing, browsing and downloading of microgrid related data, and supports the publishing of information, reports and screen information, as well as the browsing and downloading of data, reports, screens and graphics within the scope of authority.

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