CN111146795A - Distributed photovoltaic power generation energy storage management control system - Google Patents
Distributed photovoltaic power generation energy storage management control system Download PDFInfo
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- CN111146795A CN111146795A CN201911400874.5A CN201911400874A CN111146795A CN 111146795 A CN111146795 A CN 111146795A CN 201911400874 A CN201911400874 A CN 201911400874A CN 111146795 A CN111146795 A CN 111146795A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
- H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/14—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by switching loads on to, or off from, network, e.g. progressively balanced loading
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J9/00—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting
- H02J9/04—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source
- H02J9/06—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems
- H02J9/062—Circuit arrangements for emergency or stand-by power supply, e.g. for emergency lighting in which the distribution system is disconnected from the normal source and connected to a standby source with automatic change-over, e.g. UPS systems for AC powered loads
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/10—Photovoltaic [PV]
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B10/00—Integration of renewable energy sources in buildings
- Y02B10/70—Hybrid systems, e.g. uninterruptible or back-up power supplies integrating renewable energies
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/30—Systems integrating technologies related to power network operation and communication or information technologies for improving the carbon footprint of the management of residential or tertiary loads, i.e. smart grids as climate change mitigation technology in the buildings sector, including also the last stages of power distribution and the control, monitoring or operating management systems at local level
- Y02B70/3225—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02B90/20—Smart grids as enabling technology in buildings sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/12—Energy storage units, uninterruptible power supply [UPS] systems or standby or emergency generators, e.g. in the last power distribution stages
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/222—Demand response systems, e.g. load shedding, peak shaving
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/242—Home appliances
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S20/00—Management or operation of end-user stationary applications or the last stages of power distribution; Controlling, monitoring or operating thereof
- Y04S20/20—End-user application control systems
- Y04S20/248—UPS systems or standby or emergency generators
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- Business, Economics & Management (AREA)
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- Supply And Distribution Of Alternating Current (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The invention relates to the technical field of photovoltaic power generation, in particular to a distributed photovoltaic power generation energy storage management control system which comprises a photovoltaic assembly, a photovoltaic combiner box, a photovoltaic inverter, a bypass cabinet, a household load, a battery inverter, a storage battery pack, an alternating current power distribution cabinet, a power grid load, a PC (personal computer), a wireless transmission module and a mobile terminal, wherein the output end of the photovoltaic assembly is electrically connected with the input end of the photovoltaic combiner box, and the output end of the photovoltaic combiner box is electrically connected with the input end of the photovoltaic inverter. The invention achieves the purposes of effectively improving the penetration rate of the photovoltaic power generation connected to the power grid, reducing the load peak-valley difference value of the power grid and improving the utilization rate of the power grid facilities, and can store electric energy on a large scale, namely, the electric energy is stored in the load valley period and released in the load peak period, so that the configuration capacity of the power grid facilities can be reduced, the utilization rate of power transmission and distribution equipment is improved, and the construction of the existing power distribution network is delayed.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to a distributed photovoltaic power generation energy storage management control system.
Background
The main principle of photovoltaic power generation is the photoelectric effect of semiconductors. When photons irradiate on the metal, the energy of the photons can be completely absorbed by certain electrons in the metal, and the energy absorbed by the electrons is large enough to overcome the internal attraction of the metal to work, so that the photons leave the surface of the metal and escape to form photoelectrons. The silicon atom has 4 outer electrons, and if the pure silicon is doped with 5 outer electron atoms such as phosphorus atom, the silicon atom becomes an N-type semiconductor; if atoms with 3 outer electrons, such as boron atoms, are doped into pure silicon, a P-type semiconductor is formed. When the P-type and the N-type are combined together, a potential difference is formed at the contact surface, and the solar cell is formed. When sunlight irradiates the P-N junction, holes move from the N pole region to the P pole region, and electrons move from the P pole region to the N pole region to form current.
Because the traditional power generation causes environmental pollution and energy crisis, a clean sustainable energy source is urgently needed to be found to replace the traditional energy source, and the photovoltaic power generation is gradually favored by people with the advantages of cleanness, convenience, sustainable utilization and the like. The development of the photovoltaic industry is guided, encouraged and supported by the Chinese government, and the development of the photovoltaic industry is accelerated due to the continuous emergence of the national photovoltaic subsidy policy. However, with the increase of photovoltaic power generation users, when grid-connected, the impact of the electricity generated by the photovoltaic to the power grid is large, the power grid rejects the dispersed medium and small photovoltaic power generation energy storage system to be connected to the power grid, the effect of the photovoltaic power generation participating in peak clipping and valley filling of the power grid cannot be exerted, a large amount of photovoltaic power generation is wasted, the maximization of economic benefits is not realized, the loss is caused to the users, the cost of the users recovering equipment is far away and indefinite, and the confidence is lost to the photovoltaic power generation industry. The existing photovoltaic power generation energy storage system is low in energy utilization rate, poor in economic benefit, and poor in electric energy quality and power supply reliability.
Disclosure of Invention
Technical problem to be solved
Aiming at the defects of the prior art, the invention provides a distributed photovoltaic power generation energy storage management control system, which achieves the purposes of effectively improving the penetration rate of photovoltaic power generation accessed to a power grid, reducing the load peak-valley difference value of the power grid and improving the utilization rate of power grid facilities, and can store electric energy on a large scale, namely, the electric energy is stored in the load valley period and released in the load peak period, so that the configuration capacity of the power grid facilities can be reduced, the utilization rate of power transmission and distribution equipment is improved, and the construction of the existing power distribution network is delayed.
(II) technical scheme
In order to realize the technical problem, the invention provides the following technical scheme: the utility model provides a distributed photovoltaic power generation energy storage management control system, includes photovoltaic module, photovoltaic conflux case, photovoltaic inverter, bypass cabinet, domestic load, battery inverter, storage battery, AC distribution cabinet, electric wire netting load, PC, wireless transmission module and mobile terminal, photovoltaic module's output and photovoltaic conflux case's input electric connection, photovoltaic conflux case's output and photovoltaic inverter's input electric connection, photovoltaic inverter's output and bypass cabinet's input electric connection, bypass cabinet's output and battery inverter's input electric connection, battery inverter's output and storage battery's input electric connection.
The equivalent module system includes power consumption monitoring module, data processing module, event detection module, characteristic extraction module, load identification module, load characteristic database and load end, power consumption monitoring module's output and data processing module's input electric connection, data processing module's output and event detection module's input electric connection, event detection module's output and characteristic extraction module's input electric connection, the output of characteristic extraction module and load identification module's input electric connection, the input of load characteristic database and output respectively with load identification module's output and input electric connection, load identification module's output and the input electric connection of load end.
Further, the output end of the storage battery pack is electrically connected with the input end of the equivalent module system, and the output end of the equivalent module system is electrically connected with the input end of the battery inverter.
Furthermore, the output end of the road cabinet is electrically connected with the input end of a household load, the model of the bypass cabinet is ACS580MV, the rated voltage is 12KV, the power frequency withstand voltage of 1min is 42KV, the rated impact withstand voltage is 75KV, the rated frequency is 60Hz, and the rated current is 1250A.
Furthermore, the output end of the bypass cabinet is electrically connected with the input end of the alternating current power distribution cabinet, and the output end of the alternating current power distribution cabinet is electrically connected with the input end of the power grid load.
Furthermore, the output end of the bypass cabinet is electrically connected with the input end of a PC (personal computer), the PC is an industrial control computer, and the PC is UNO-2184G-D45E in model number.
Furthermore, the output end of the bypass cabinet is electrically connected with the input end of the wireless transmission module, and the output end of the wireless transmission module is electrically connected with the input end of the mobile terminal through the area network.
(III) advantageous effects
The invention provides a distributed photovoltaic power generation energy storage management control system, which has the following beneficial effects:
1. the photovoltaic power generation system can smooth the output power fluctuation of photovoltaic power generation, and the photovoltaic power generation has strong intermittence, fluctuation and uncertainty, so that great impact can be brought when the photovoltaic power generation system is connected into a power grid, the photovoltaic power generation system has power controllability and schedulability for the whole power grid, the penetration rate of the photovoltaic power generation system connected into the power grid is effectively improved, meanwhile, the load peak-valley difference value of the power grid is reduced, the utilization rate of power grid facilities is improved, and electric energy can be stored on a large scale, namely the electric energy is stored in the load valley period and released in the load peak period, so that the configuration capacity of the power grid facilities can be reduced, the utilization rate of power transmission and distribution equipment is improved, and the construction of the conventional power distribution network.
2. The invention can improve the reserve capacity of the power supply, enhance the safety stability and the power supply quality of the power grid, and provide the reserve capacity for the existing power supply in order to ensure certain power supply safety reliability, so that when the large power grid fails, an energy storage system can be used as the reserve power supply to temporarily establish a micro-power grid and provide the reserve power supply for important loads until the power grid recovers, and when the power quality of the power grid is poor, the power is limited by pulling a brake or the power is cut due to failure, the optical storage micro-power grid can be separated from the power grid, and the energy storage converter establishes stable voltage through a battery to ensure the normal power generation of photovoltaic power and independently provide the emergency reserve power supply for the local important loads.
3. The distributed optical storage micro-grid can better meet the higher and higher safety and reliability requirements of users compared with the traditional large-grid power supply mode, and provides diversified and personalized power supply requirements for different users.
4. The invention can not influence or influence the monitoring tool of the acting object as little as possible through the addition of the equivalent module system, can provide specific data of the power consumption of various electric equipment such as residential users and the like for an electric power company, and the energy efficiency monitoring terminal of the method has the greatest difference that only a signal sampling device is needed to be arranged at an electric power inlet wire, and the power consumption information of single equipment can be analyzed according to the total electric energy signal of the collected system, thereby overcoming the defects of high cost, inconvenient installation and maintenance of the monitoring device in the traditional invasive monitoring method.
Drawings
FIG. 1 is a schematic diagram of the system components of the management control system of the present invention;
FIG. 2 is a schematic block diagram of an equivalent modular system of the present invention;
FIG. 3 is a circuit diagram of an equivalent module of the present invention.
In the figure: 1. a photovoltaic module; 2. a photovoltaic combiner box; 3. a photovoltaic inverter; 4. a bypass cabinet; 5. a domestic load; 6. a battery inverter; 7. a battery pack; 8. an AC distribution cabinet; 9. a grid load; 10. a PC machine; 11. a wireless transmission module; 12. a mobile terminal; 71. an equivalent modular system; 711. a power consumption monitoring module; 712. a data processing module; 713. an event detection module; 714. a feature extraction module; 715. a load identification module; 716. a load characteristic database; 717. a load side.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1-3, the present invention provides a technical solution: the utility model provides a distributed photovoltaic power generation energy storage management control system, including photovoltaic module 1, photovoltaic conflux case 2, photovoltaic inverter 3, bypass cabinet 4, domestic load 5, battery inverter 6, storage battery 7, AC distribution cabinet 8, electric wire netting load 9, PC 10, wireless transmission module 11 and mobile terminal 12, photovoltaic module 1's output and photovoltaic conflux case 2's input electric connection, photovoltaic conflux case 2's output and photovoltaic inverter 3's input electric connection, photovoltaic inverter 3's output and bypass cabinet 4's input electric connection, bypass cabinet 4's output and battery inverter 6's input electric connection, battery inverter 6's output and storage battery 7's input electric connection.
The output end of the storage battery pack 7 is electrically connected with the input end of the equivalent module system 71, the output end of the equivalent module system 71 is electrically connected with the input end of the battery inverter 6, the output end of the bypass cabinet 4 is electrically connected with the input end of the household load 5, the model of the bypass cabinet 4 is ACS580MV, the rated voltage is 12KV, the 1min power frequency withstand voltage is 42KV, the rated impact withstand voltage is 75KV, the rated frequency is 60Hz, the rated current is 1250A, the output end of the bypass cabinet 4 is electrically connected with the input end of the AC power distribution cabinet 8, the output end of the AC power distribution cabinet 8 is electrically connected with the input end of the power grid load 9, the output end of the bypass cabinet 4 is electrically connected with the input end of the PC 10, the PC 10 is an industrial control computer, the model of the PC 10 is UNO-2184G-D45E, the output end of the bypass cabinet 4 is, the output end of the wireless transmission module 11 is electrically connected with the input end of the mobile terminal 12 through the local area network.
The storage battery pack 7 mainly comprises an energy storage battery, a battery management system and an energy storage converter, wherein the energy storage battery is used as a carrier for energy storage, energy moving and power compensation can be realized, the lithium ion battery energy storage technology is a novel large-scale high-efficiency electrochemical energy storage technology, and compared with other battery energy storage technologies, the lithium ion battery has the advantages of high voltage, high energy density, high output power, high energy efficiency, long service life of the battery, low self-discharge, environmental protection, no pollution and the like, so that the large-scale energy storage system is more and more widely applied, the battery management system can carry out omnibearing monitoring, management, protection, alarm and the like on a battery array group, the service life of an energy storage battery stack is prolonged to the maximum extent, the large storage battery pack 7 generally adopts a three-layer modular structure and comprises a battery stack management system (BAMS), a Battery Cluster Management System (BCMS), battery module management unit (BMU), etc.
EMS is a controller of the whole photovoltaic microgrid system, the energy management function of the EMS comprises system operation mode judgment, power scheduling and equipment operation state control, specifically, whether the system is in independent operation or grid-connected operation is judged according to the state of a power grid, the power scheduling of a photovoltaic power generation and energy storage system is completed according to the dynamic power balance principle during the independent operation, the start-stop control of a photovoltaic grid-connected inverter and the networking control of a dual-mode inverter are completed according to the state of a storage battery during the grid-connected operation, the charge control of the dual-mode inverter and the start-stop control of the grid-connected inverter are completed according to the state of the storage battery during the grid-connected operation of the system, the PCS is in the grid-connected operation state, the EMS judges whether the PCS needs to charge the storage battery and in which way to charge, and generating power by the maximum power of the photovoltaic grid-connected inverter, and for the micro-grid power station needing to receive a scheduling instruction, the EMS transmits the scheduling instruction to the photovoltaic grid-connected inverter to control the power generation power according to the instruction.
And in the grid-connected state, if the EMS detects that the power grid loses power or the power grid fails, the grid-connected switch is controlled to be switched off, meanwhile, the PCS is automatically switched to the independent operation, the voltage of the system is started and established in a voltage source mode, the photovoltaic grid-connected inverter is stopped due to power loss, the EMS controls the grid-connected inverter to be restarted after the PCS is started, and the system enters an independent operation mode.
When the system operates independently, the management principle of the EMS is to maintain the dynamic balance of the micro-grid power through the management of the power supply and the load, and ensure the stability of the bus voltage and the frequency, at the moment, the PCS voltage source operates to output three-phase alternating voltage networking, the photovoltaic grid-connected inverter operates in parallel, at the moment, the EMS needs to manage the power supply and the load according to the size of the load and the generated power size of the power supplies such as photovoltaic power generation, and when the system operates independently, the management principle of the EMS is to maintain the dynamic balance of the micro-grid power through the management of the power supply and the load, and ensure the stability of the bus voltage and the frequency, at the moment, the PCS voltage source operates to output three-phase alternating voltage networking, the photovoltaic grid-connected inverter operates in parallel, at the moment, the EMS needs.
The system is divided into two operation modes, firstly, the load power is greater than the output power of the distributed power supply, then the maximum power of each power supply generates power, PCS supplements the power demand of the rest part of the load, the storage battery releases electric energy, EMS monitors the state of the storage battery in real time, when the storage battery discharges to the cut-off voltage, EMS starts load management, the load management needs to classify different loads according to the actual conditions, the power supply of important sensitive loads is prioritized, firstly, unimportant loads are cut off until the storage battery stops discharging, secondly, the power consumed by the loads is less than the power output by the power supply, PCS charges the storage battery at the moment, EMS also detects the state of the storage battery in real time, the power output of the EMS limits the power supply after the storage battery is fully charged, for the photovoltaic power generation system which can be scheduled, the output of, the EMS controls the on/off of the grid-connected inverter to realize the control of the generated power, and for a system consisting of a plurality of groups of grid-connected inverters, the step-by-step control is needed according to the actual conditions (the control performance, the quantity, the power grade and the like of the photovoltaic inverters) in order to reduce the impact of the simultaneous starting of the photovoltaic grid-connected inverters on the bus voltage.
After the EMS detects that the voltage of the power grid is normal in the independent operation state, the operation mode of the PCS is switched to grid-connected operation, the PCS automatically adjusts the output voltage to be synchronous with the voltage of the large power grid, then the EMS closes a grid-connected switch, all equipment is in grid-connected operation, and the system enters the grid-connected operation mode.
The equivalent module system 71 includes a power consumption monitoring module 711, a data processing module 712, an event detection module 713, a feature extraction module 714, a load identification module 715, a load feature database 716 and a load end 717, an output end of the power consumption monitoring module 711 is electrically connected to an input end of the data processing module 712, an output end of the data processing module 712 is electrically connected to an input end of the event detection module 713, an output end of the event detection module 713 is electrically connected to an input end of the feature extraction module 714, an output end of the feature extraction module 714 is electrically connected to an input end of the load identification module 715, an input end and an output end of the load feature database 716 are respectively electrically connected to an output end and an input end of the load identification module 715, and an output end of the load identification module 715 is electrically connected to an input end of the load end.
The purpose of the electric quantity monitoring is to obtain steady-state and transient-state signals of the total load, measurement errors have important influence on the efficiency monitoring, and the important point is to process data and improve the noise resistance of the load identification method.
The data processing mainly comprises denoising, calculation of active electric quantity and the like, per unit processing and the like, the purpose of per unit processing is to facilitate processing of interference problems caused by electric energy quality fluctuation, and event detection can be performed on the processed data so as to obtain the running state change condition of the electric equipment.
The event detection is based on the change condition of the load imprint within a certain time period, specifically two methods of regular judgment and variable point detection are adopted, the difficulty of the part lies in the parameter selection of each method, wherein the selection of the time period and the change threshold of the load imprint is crucial, and the event detection result is wrong when the time period is too large or too small, and the calculation amount is possibly increased.
The characteristic extraction is to extract a series of different load imprint characteristics for load identification from data before and after an event occurs, and at present, many schemes are provided, such as extraction schemes of fourier transform, wavelet transform and the like are provided for active load imprint, in order to accurately identify loads with similar load imprint, the extracted characteristic information should be as effective as possible, and different load imprint and extraction method selections have different results.
The load identification is to compare the extracted features with the load features in the existing load feature library, and when the extracted features and the load features in the existing load feature library reach a certain similarity, corresponding electric equipment is identified, and the load feature library is established by two methods at present, wherein one method is to record the load mark features of each electric equipment under the manual assistance; secondly, the algorithm is automatically classified, the load recognition algorithm mainly comprises a mathematical optimization algorithm and a pattern recognition algorithm, the former algorithm is poor in effect and is used less, the latter algorithm belongs to a branch of an artificial intelligence method, the selectable algorithms are more, and the performance of the algorithms has advantages and disadvantages.
Referring to fig. 3, E is a battery electromotive force mainly influenced by SOC and temperature, R1 is ohmic internal resistance and polarization internal resistance mainly influenced by SOC, temperature and working current, R2 is polarization internal resistance in a transition process, representing concentration polarization and electrochemical polarization of the battery, C is a phase-to-phase differential capacitance inside the battery, reflecting the transition process of the battery, influenced by SOC, S0C is a battery charge state, the battery can be equivalently an ideal DC voltage source, energy exchange between the battery and the DC bus needs to be realized by a charge-discharge controller, which is a bidirectional DC-DC converter, by controlling the magnitude and flow direction of the inductive current value of the energy storage bidirectional converter, charge-discharge of the battery is realized, energy emitted by the photovoltaic battery can be stored in the battery, and the battery can be released to a household ac load or a power grid, the photovoltaic system and the storage battery are connected in parallel on the same direct current bus, the stability of the bus voltage is very important, the bus voltage is too low to influence the work of a chopper circuit and an inverter circuit, the circuit equipment is damaged if the bus voltage is too high, the photovoltaic output power fluctuation is large, therefore, the storage battery is required to carry out scheduling management to maintain the bus voltage stable, the control strategy of the storage battery adopts double-loop control of a voltage outer loop and a current inner loop, the voltage outer loop maintains the voltage stability of the direct current bus, and the current inner loop controls the charging and discharging current of the storage battery.
The invention has the beneficial effects that: the photovoltaic power generation system can smooth the output power fluctuation of photovoltaic power generation, and the photovoltaic power generation has strong intermittence, fluctuation and uncertainty, so that great impact can be brought when the photovoltaic power generation system is connected into a power grid, the photovoltaic power generation system has power controllability and schedulability for the whole power grid, the penetration rate of the photovoltaic power generation system connected into the power grid is effectively improved, meanwhile, the load peak-valley difference value of the power grid is reduced, the utilization rate of power grid facilities is improved, and electric energy can be stored on a large scale, namely the electric energy is stored in the load valley period and released in the load peak period, so that the configuration capacity of the power grid facilities can be reduced, the utilization rate of power transmission and distribution equipment is improved, and the construction of the conventional power distribution network.
The invention can not influence or influence the monitoring tool of the acting object as little as possible through the addition of the equivalent module system 71, can provide specific data of the power consumption of various electric equipment such as residential users and the like for an electric power company, has the biggest difference of the energy efficiency monitoring terminal, and is characterized in that only a signal sampling device is arranged at an electric power inlet wire, and the power consumption information of single equipment can be analyzed according to the total electric energy signal of the collected system, thereby overcoming the defects of high cost, inconvenient installation and maintenance of the monitoring device in the traditional invasive monitoring method.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (6)
1. The utility model provides a distributed photovoltaic power generation energy storage management control system, includes photovoltaic module (1), photovoltaic conflux case (2), photovoltaic inverter (3), bypass cabinet (4), domestic load (5), battery inverter (6), storage battery (7), AC distribution cabinet (8), electric wire netting load (9), PC (10), wireless transmission module (11) and mobile terminal (12), its characterized in that: the output end of the photovoltaic assembly (1) is electrically connected with the input end of the photovoltaic combiner box (2), the output end of the photovoltaic combiner box (2) is electrically connected with the input end of the photovoltaic inverter (3), the output end of the photovoltaic inverter (3) is electrically connected with the input end of the bypass cabinet (4), the output end of the bypass cabinet (4) is electrically connected with the input end of the battery inverter (6), and the output end of the battery inverter (6) is electrically connected with the input end of the storage battery pack (7);
the equivalent module system (71) comprises a power consumption monitoring module (711), a data processing module (712), an event detection module (713), a feature extraction module (714), a load identification module (715), a load feature database (716) and a load end (717), wherein the output end of the power consumption monitoring module (711) is electrically connected with the input end of the data processing module (712), the output end of the data processing module (712) is electrically connected with the input end of the event detection module (713), the output end of the event detection module (713) is electrically connected with the input end of the feature extraction module (714), the output end of the feature extraction module (714) is electrically connected with the input end of the load identification module (715), and the input end and the output end of the load feature database (716) are respectively electrically connected with the output end and the input end of the load identification module (715), the output end of the load identification module (715) is electrically connected with the input end of the load end (717).
2. The distributed photovoltaic power generation energy storage management and control system according to claim 1, wherein: the output end of the storage battery pack (7) is electrically connected with the input end of the equivalent module system (71), and the output end of the equivalent module system (71) is electrically connected with the input end of the battery inverter (6).
3. The distributed photovoltaic power generation energy storage management and control system according to claim 1, wherein: the output end of the road cabinet (4) is electrically connected with the input end of the household load (5), the model of the bypass cabinet (4) is ACS580MV, the rated voltage is 12KV, the 1min power frequency withstand voltage is 42KV, the rated impact withstand voltage is 75KV, the rated frequency is 60Hz, and the rated current is 1250A.
4. The distributed photovoltaic power generation energy storage management and control system according to claim 1, wherein: the output end of the bypass cabinet (4) is electrically connected with the input end of the alternating current power distribution cabinet (8), and the output end of the alternating current power distribution cabinet (8) is electrically connected with the input end of the power grid load (9).
5. The distributed photovoltaic power generation energy storage management and control system according to claim 1, wherein: the output end of the bypass cabinet (4) is electrically connected with the input end of a PC (10), the PC (10) is an industrial control computer, and the model of the PC (10) is UNO-2184G-D45E.
6. The distributed photovoltaic power generation energy storage management and control system according to claim 1, wherein: the output end of the bypass cabinet (4) is electrically connected with the input end of the wireless transmission module (11), and the output end of the wireless transmission module (11) is electrically connected with the input end of the mobile terminal (12) through the area network.
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Application publication date: 20200512 |