CN108964263A - A kind of isolated island type micro-capacitance sensor and its Energy Management System - Google Patents
A kind of isolated island type micro-capacitance sensor and its Energy Management System Download PDFInfo
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- 238000010248 power generation Methods 0.000 claims abstract description 13
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- H02J13/0062—
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- H02J13/0075—
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H02J3/385—
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- H02J3/386—
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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
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/388—Islanding, i.e. disconnection of local power supply from the network
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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
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/70—Wind energy
- Y02E10/76—Power conversion electric or electronic aspects
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/10—Flexible AC transmission systems [FACTS]
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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
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/12—Monitoring or controlling equipment for energy generation units, e.g. distributed energy generation [DER] or load-side generation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S40/00—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them
- Y04S40/12—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment
- Y04S40/126—Systems for electrical power generation, transmission, distribution or end-user application management characterised by the use of communication or information technologies, or communication or information technology specific aspects supporting them characterised by data transport means between the monitoring, controlling or managing units and monitored, controlled or operated electrical equipment using wireless data transmission
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Abstract
The units such as a kind of isolated island type micro-capacitance sensor and its Energy Management System, including diesel engine, photovoltaic power generation array, blower, battery energy storage system and load, using the topological structure of common bus.For the photovoltaic power generation array by photovoltaic inverter grid-connected, the blower is grid-connected by blower rectifier, and the battery energy storage system is grid-connected by energy accumulation current converter, and the load is connect with bus.Each branch and bus junction are respectively arranged with switch and ammeter, and one end of switch connects bus, and the other end connects ammeter, and the other end of ammeter is connected with branch.Cut-offfing to controlling brancher is switched, ammeter acquires the information such as voltage, electric current, power, power factor and the electricity of branch.The Energy Management System of the isolated island type micro-capacitance sensor is made of the local control system based on PLC with intelligent cloud platform；The isolated island type microgrid energy management system uses the operation control strategy based on expert tactics.
Description
Technical field
The present invention relates to a kind of isolated island type micro-capacitance sensor and its Energy Management System.
Background technique
With the fast development of distributed power generation, increasingly get the favour of people.But due to distributed power generation with
Machine and stability bandwidth, the disadvantage that being continuously increased of permeability will lead to uncontrollability is further significant, therefore, in order to weaken distribution
The drawbacks of power generation direct grid-connected, the development of distributed generation resource is promoted, micro-capacitance sensor comes into being.
Micro-capacitance sensor is made of distributed generation resource, energy storage device, energy conversion device, load, monitoring and protective device etc.,
Small-sized electric system with automatic adjustment, protection and management function.It includes grid-connected and two kinds of operating modes of isolated island.It is grid-connected
When operation, micro-capacitance sensor is connect with bulk power grid by common node to provide support；When isolated operation, micro-capacitance sensor is by reconfiguring
Important load similar in geographical location forms new electric network composition, and takes corresponding control strategy to ensure important load
Continual and steady operation, thus adaptibility to response when improving in face of burst natural calamity or emergency episode, bulk power grid is not covered or
Periphery plays supplement and improvement result well.Compared to the micro-capacitance sensor that is incorporated into the power networks, isolated island type micro-capacitance sensor can more embody
The value of micro-capacitance sensor.The area covered is difficult in bulk power grids such as remote, mountain area, islands, isolated island type micro-capacitance sensor is main power supply
System.It in order to make full use of the renewable energy such as photovoltaic, wind-powered electricity generation, while ensureing the reliable power supply of load, constructs typical isolated island
Type micro-grid system is particularly significant.
Chinese patent 201510718968.2 discloses a kind of microgrid energy management system, by establishing energy management mesh
Scalar functions, and seek by constraint the optimal solution of systematic economy operation, pass through distributed energy management solutions system, micro-capacitance sensor
Intelligent Energy administrative center and local energy controller carry out multi-zone supervision, realize the real-time control of energy management, and pass through
The optimization operation of microgrid energy management system is realized in medium-term and long-term management, grid-connected off-grid Operation Mode Optimization.The invention is main
It is to be analyzed for grid type micro-capacitance sensor.
Chinese patent 201711158853.8 discloses a kind of Energy Management System of the micro-capacitance sensor based on comprehensively monitoring, including
Control layer, Web communication layer and main website layer on the spot, the main website layer include the first host and the second host, first work station and the
Two work stations, the control layer on the spot include that measuring and controlling protective device, blower management subsystem, battery management subsystem and energy storage are inverse
Become device, photovoltaic array management subsystem, the Web communication layer includes cordless communication network, and the control layer on the spot passes through wireless
Communication network and main website layer communicate to connect.The invention is not involved with the foundation and analysis of cloud platform.
Summary of the invention
In order to overcome the shortcomings of the prior art, the present invention proposes a kind of isolated island type micro-capacitance sensor and its Energy Management System.This hair
Bright isolated island type micro-capacitance sensor effectively manages local energy information using PLC technology, constructs intelligent cloud platform, can be right
Micro-capacitance sensor carries out remote on-line monitoring, and can excavate the inherent law of unit and system, to improve the operation of isolated island type micro-capacitance sensor
Stability, reliability and economy.
The invention is realized by the following technical scheme:
Isolated island type micro-capacitance sensor typical topology of the present invention is as follows:
Isolated island type micro-capacitance sensor of the invention, according to design and application demand, can be direct current mother by the way of common bus
Line, ac bus or alternating current-direct current mixing bus, voltage class are also depending on the circumstances.The isolated island type micro-capacitance sensor includes
The branches such as diesel engine, photovoltaic power generation array, blower, battery energy storage system and load, wherein photovoltaic power generation array is inverse by photovoltaic
It is grid-connected to become device, blower is grid-connected by blower rectifier, and battery energy storage system is grid-connected by energy accumulation current converter.Load and bus connect
It connects, multi-class workload can be divided into according to significance level load, when needing to cut off load, cut since the minimum level-one of importance
It removes.In addition, each branch and bus junction are respectively arranged with switch and ammeter, one end of switch connects bus, and the other end connects ammeter,
The other end of ammeter is connected with branch.Cut-offfing to controlling brancher is switched, ammeter acquires voltage, electric current, power, the function of branch
The information such as rate factor, electricity.
Isolated island type microgrid energy management system of the present invention is mainly by local control system and intelligent cloud platform based on PLC
Composition.
(1) the local control system based on PLC
PLC is connected by the switch module of itself with each branch switch, is controlled cut-offfing for each branch switch, is acquired each branch
Information: by RS485 bus and MODBUS agreement, i.e. MODBUS-RTU and each branch ammeter communicate, and read the electricity of each ammeter
The information such as stream, power；It is communicated by RS485 bus and MODBUS agreement and diesel engine, controls the open and close of diesel engine, with
And power output etc.；It is logical with photovoltaic DC-to-AC converter and blower rectifier by Ethernet and MODBUS agreement, i.e. MODBUS-TCP
News control their open and close, operating mode, such as MPPT or limit Power operation；Pass through Ethernet and MODBUS agreement
It is communicated with the battery management system (BMS) and energy accumulation current converter of battery energy storage system, battery energy storage system mainly includes series-parallel
Cell array, battery management system (BMS) and the energy accumulation current converter of formation, battery management system are acquired each by CAN communication
The information such as electric current, voltage and the temperature of battery, and communicated by MODBUS-RTU and energy accumulation current converter.PLC is available as a result,
Each branch of isolated island type micro-capacitance sensor and diesel engine, photovoltaic power generation array, blower, battery energy storage system and load operation information, into
And concentrate and carry out data processing and be applied to control strategy, according to operational objectives such as energy balance, frequency modulation and voltage modulations, failure is cut automatically
The functional requirements such as remove and restore, realization locally controls reliable and stable.Finally, PLC is carried out by MODBUS-TCP and cloud platform
Communication, demand information is uploaded.
(2) intelligent cloud platform
Intelligent cloud platform mainly includes database, display interface, remote monitoring software, big data analysis etc..Intelligent cloud is flat
Platform obtains the information of entire micro-capacitance sensor from PLC and is stored to number by Ethernet and MODBUS agreement, i.e. MODBUS-TCP
According to library, database can choose the types such as SQLServer, Oracle, and database mainly includes real-time data base, historical data
Library, alarm system and repository etc..Real-time data base can store, handle and transmit data, can change number according to actual needs
According to update and covering cycle；Historical data base is mainly used to store historical data, by data processed in real-time data base
It is stored for consulting and back up, the calculating of some statistics in addition can also have been carried out to data, average value including the date,
Maximum value and minimum value etc.；When error or fault occurs in database, alarm system provides alarm and prompt；Repository is used to tie up
Protect the relationships such as structure and the connection of data.Display interface is the monitoring interface based on cloud platform exploitation, can be to wind-light storage lotus
The information such as the operating status of power, switch state, micro-capacitance sensor are shown and are managed.The cloud platform can access multiple micro- simultaneously
Network system can be realized remote on-line monitoring, to guarantee the safe and stable operation of multiple micro-capacitance sensors.Remote monitoring software
For systems such as cell phone applications, in conjunction with fast wireless mechanics of communication, as long as being mounted with related APP in mobile phone, it can realize at any time with
Monitoring of the ground to micro-capacitance sensor.In addition, cloud platform can also analyze a large amount of data by the methods of mathematical statistics, dig
The inherent law between different units is dug, the operation for micro-capacitance sensor and its each unit provides theory support.
Isolated island type microgrid energy management system of the present invention uses the operation control strategy based on expert tactics, specifically such as
Under:
It establishes the operation control strategy based on expert tactics and is embedded in PLC, to guarantee that stablizing for isolated island type micro-capacitance sensor is transported
Row.Work as renewable energy, i.e. when the general power of photovoltaic and wind-powered electricity generation can satisfy load power, diesel engine does not start, battery energy storage
System is as group network source.If renewable energy source power has residue, charge to battery energy storage system；When dump power exceeds
The maximum charge power or battery energy storage SOC of battery energy storage system reach the upper limit, then renewable energy limits Power operation.
When renewable energy source power cannot meet load power, is discharged by battery energy storage system supplement difference first, when
Battery energy storage SOC reaches lower limit or the power that need to supplement has exceeded the maximum discharge power of energy storage, starts diesel engine；If surplus
The remaining power required supplementation with exceeds the maximum allowable power of diesel engine, then diesel engine presses maximum power output, while pressing importance
Sequence cuts off some insignificant property loads；If diesel engine works in power area lower limit, in order to improve the efficiency of diesel engine, by bavin
Oil machine is run by power area lower limit value, if battery energy storage system is also discharging at this time, reduces the electric discharge of battery energy storage system
Power, conversely, charging to battery energy storage system.
Detailed description of the invention
Fig. 1 is isolated island type micro-capacitance sensor typical topology figure；
Fig. 2 is isolated island type microgrid energy management system figure；
Fig. 3 is battery energy storage system Energy Management System figure；
Fig. 4 is operation control strategy (one) schematic diagram based on expert tactics；
Fig. 5 is operation control strategy (two) schematic diagram based on expert tactics.
Specific embodiment
Below in conjunction with figure, the invention will be further described with specific embodiment.
Fig. 1 is isolated island type micro-capacitance sensor typical topology figure, as shown in Figure 1, isolated island type micro-capacitance sensor of the present invention is using mother altogether
The mode of line can be DC bus, ac bus or alternating current-direct current mixing bus, voltage etc. according to design and application demand
Grade is also depending on the circumstances.It include diesel engine, photovoltaic power generation array, blower, battery energy storage system and load etc. in micro-capacitance sensor
Branch, wherein for photovoltaic power generation array by photovoltaic inverter grid-connected, blower is grid-connected by blower rectifier, and battery energy storage system is logical
It is grid-connected to cross energy accumulation current converter, load is connect with bus, can be divided into multi-class workload according to significance level, when needing to cut off load
When, since the minimum level-one of importance.In addition, each branch road has been respectively mounted switch and ammeter, switch control branch circuit is cut-off,
Ammeter acquires the information such as voltage, electric current, power, power factor, the electricity of branch.
As shown in Fig. 2, isolated island type microgrid energy management system of the present invention mainly by based on PLC local control system and
Intelligent cloud platform two parts composition.
(1) the local control system based on PLC
PLC is connected by the switch module of itself with each branch switch, is controlled cut-offfing for each branch switch, is acquired each branch
Information: by RS485 bus and MODBUS agreement, i.e. MODBUS-RTU, communicated with each branch ammeter, read each ammeter
The information such as electric current, power；It is communicated by RS485 bus and MODBUS agreement with diesel engine, to control diesel engine
Open and close and power output etc.；By Ethernet and MODBUS agreement, i.e. MODBUS-TCP, with photovoltaic DC-to-AC converter and
The communication of blower rectifier controls their open and close, operating mode, such as MPPT or limit Power operation；Pass through Ethernet
It is communicated with MODBUS agreement and battery energy storage system.The available each branch of PLC and diesel engine, photovoltaic power generation array, wind as a result,
The operation information of mechanical, electrical pond energy-storage system and load, and then concentrate and carry out data processing and be applied to control strategy, according to energy
The operational objectives such as balance, frequency modulation and voltage modulation, failure such as cut off and restore automatically at the functional requirements, and realization locally controls reliable and stable.
Finally, PLC is communicated by MODBUS-TCP and cloud platform, demand information is uploaded.
(2) intelligent cloud platform
Intelligent cloud platform mainly includes database, display interface, remote monitoring software, big data analysis etc..Intelligent cloud is flat
Platform obtains the information of entire micro-capacitance sensor from PLC by MODBUS-TCP and is stored to database.Database can choose SQL
The types such as Server, Oracle.Database mainly includes real-time data base, historical data base, alarm system and repository etc..It is real
When database can store, handle and transmit data, update and the covering cycle of data can be changed according to actual needs；History number
Be mainly used to store historical data according to library, mainly by data processed in real-time data base be stored for consult and it is standby
Part, some statistics in addition can also have been carried out to data and calculated, average value, maximum value and minimum value including the date etc.；When
When error or fault occurs in database, alarm system provides alarm and prompt；Repository is used to safeguard the structure and connection of data
Etc. relationships.Display interface is the monitoring interface based on cloud platform exploitation, can power, switch state, micro- electricity to wind-light storage lotus
The information such as the operating status of net are shown that the cloud platform can access multiple micro-grid systems simultaneously, can be realized remote
On-line monitoring, to guarantee the safe and stable operation of multiple micro-capacitance sensors.Remote monitoring software is the systems such as cell phone application, in conjunction with fast
Fast wireless communication technique, as long as being mounted with related APP in mobile phone, it can realize whenever and wherever possible to the monitoring of micro-capacitance sensor.In addition,
By the methods of mathematical statistics, intelligent cloud platform can also analyze a large amount of data, excavate interior between different units
In rule, the operation for micro-capacitance sensor and its each unit provides theory support.
Fig. 3 is battery energy storage system Energy Management System figure, is the materialization of battery energy storage system in Fig. 2.Battery energy storage
System mainly includes the cell array formed in series and parallel, battery management system BMS and current transformer, and battery management system BMS passes through
CAN communication is acquired the information such as the electric current, voltage and temperature of each battery, and is carried out by MODBUS-RTU and current transformer
Communication, BMS and current transformer are communicated by MODBUS-TCP and PLC.
Fig. 4 show the operation control strategy mode (one) based on expert tactics.When renewable energy source power, i.e., photovoltaic and
The general power P of wind-powered electricity generationresIt can satisfy load power PloadWhen, diesel engine does not start, and battery energy storage system is as group network source.
If renewable energy power PresThere is residue, then charges to battery energy storage system；When dump power is beyond battery energy storage system
Maximum charge power or battery energy storage SOC reach the upper limit, then renewable energy, i.e., photovoltaic and wind-powered electricity generation limit Power operation.
Fig. 5 show the operation control strategy mode (two) based on expert tactics.When renewable energy power PresIt cannot expire
Sufficient load power PloadWhen, it is discharged supplement difference by battery energy storage first, when battery energy storage SOC reaches lower limit or need to supplement
Power has exceeded battery energy storage maximum discharge power Pes,max, start diesel engine；If the power that residue requires supplementation with is beyond diesel oil
The maximum allowable power of machine, then diesel engine presses maximum power output, while cutting off some insignificant property loads by importance ranking；
If diesel engine works in power area lower limit, in order to improve the efficiency of diesel engine, it is pressed into power area lower limit value Pd,minOperation, such as
Battery energy storage system is also discharging fruit at this time, then reduces discharge power, conversely, charging to battery energy storage system.
In Fig. 4, Fig. 5, PresFor renewable energy source power, the i.e. general power of photovoltaic and wind-powered electricity generation, PloadFor load power, Pes
For battery energy storage power, Pes,maxFor battery energy storage maximum charge-discharge electric power, PdFor diesel engine power, Pd,minFor efficient diesel
The power area lower power value of operation, SOC are energy storage charge state, SOCminFor energy storage charge state lower limit value, SOCmaxFor storage
It can state-of-charge upper limit value.
Claims (5)
1. a kind of isolated island type micro-capacitance sensor and its Energy Management System, it is characterised in that: the isolated island type micro-capacitance sensor includes diesel oil
Machine, photovoltaic power generation array, blower, battery energy storage system and load, using the topological structure of common bus；The photovoltaic power generation battle array
Column are by photovoltaic inverter grid-connected, and the blower is grid-connected by blower rectifier, and the battery energy storage system passes through energy storage
Current transformer is grid-connected, and the load is connect with bus；Load is divided into multistage according to significance level, when needing to cut off load, from
The minimum level-one of importance starts to cut off；Each branch and bus junction are respectively arranged with switch and ammeter, and one end of switch connects female
Line, the other end connect ammeter, and the other end of ammeter is connected with branch；Cut-offfing to controlling brancher is switched, ammeter acquires branch
Voltage, electric current, power, power factor and information about power；The Energy Management System of the isolated island type micro-capacitance sensor is by being based on PLC
Local control system and intelligent cloud platform composition；The isolated island type microgrid energy management system, which uses, is based on expert tactics
Operation control strategy.
2. isolated island type micro-capacitance sensor as described in claim 1 and its Energy Management System, it is characterised in that: the bus is straight
It is depending on the circumstances to flow bus, ac bus or alternating current-direct current mixing bus, voltage class.
3. isolated island type micro-capacitance sensor as described in claim 1 and its Energy Management System, it is characterised in that: described based on PLC
Local control system system it is as follows:
PLC is connected by the switch module of itself with each branch switch, is controlled cut-offfing for each branch switch, is acquired the fortune of each branch
Row information: the local control system based on PLC is communicated by RS485 bus and MODBUS agreement and each branch ammeter, is read each
Electric current, the power of ammeter；It is communicated by RS485 bus and MODBUS agreement and diesel engine, controls the open and close of diesel engine,
And power output；It is communicated by Ethernet and MODBUS agreement and photovoltaic DC-to-AC converter and blower rectifier, controls opening for they
It opens and closes and operating mode；Pass through the battery management system and change of Ethernet and MODBUS agreement and battery energy storage system
Flow device communication；Battery energy storage system includes cell array, battery management system and the current transformer formed in series and parallel, battery management system
System acquires the electric current, voltage and temperature information of each battery by CAN communication, and is led to by MODBUS-RTU and current transformer
News；PLC is concentrated according to the operation information of acquired each branch and is carried out data processing and be applied to control strategy, according to energy
Balance, frequency modulation and voltage modulation operational objective, failure cut offs automatically and restore requirement, realize and locally control reliable and stable, and pass through
MODBUS-TCP and cloud platform communicate, and demand information is uploaded.
4. isolated island type micro-capacitance sensor as described in claim 1 and its Energy Management System, it is characterised in that: the intelligent cloud is flat
Platform includes database, display interface, remote monitoring software and big data analysis；Intelligent cloud platform is assisted by Ethernet and MODBUS
View obtains the information of entire micro-capacitance sensor from PLC and is stored to database；The database includes real-time data base, history
Database, alarm system and repository；Real-time data base storage, processing and transmitting data, change data according to actual needs
Update and covering cycle；Data processed in real-time data base are stored for consulting by historical data base store historical data
And backup；The statistics that database carries out some average values including the date, maximum value and minimum value calculates；When database occurs
When error or fault, alarm system provides alarm and prompt；Repository is used to safeguard the relationships such as structure and the connection of data；Display
Interface is the monitoring interface based on intelligent cloud platform development, is capable of the operation of power, switch state, micro-capacitance sensor to wind-light storage lotus
State carries out large screen display, so that the operation for micro-capacitance sensor provides visual management；Intelligent cloud platform can access simultaneously
Multiple micro-grid systems realize on-line monitoring at a distance, by the operation information of the multiple micro-capacitance sensors of display interface Real time displaying,
To guarantee the safe and stable operation of micro-capacitance sensor；Remote monitoring software is this kind of system of cell phone application, is realized whenever and wherever possible to micro- electricity
The monitoring of net；Intelligent cloud platform can analyze a large amount of data, excavate the inherent law between different units, be micro- electricity
The operation of net and its each unit provides theory support.
5. isolated island type micro-capacitance sensor as described in claim 1 and its Energy Management System, it is characterised in that: to the isolated island type
Microgrid energy management system uses the operation control strategy based on expert tactics, specific as follows:
In the operation control strategy insertion PLC based on expert tactics；
When renewable energy source power, i.e. the general power P of photovoltaic and wind-powered electricity generationresIt can satisfy load power PloadWhen, diesel engine does not open
Dynamic, battery energy storage system is as group network source；Such as renewable energy power PresThere is residue, then charges to battery energy storage system；When
Maximum charge power or battery energy storage SOC of the dump power beyond battery energy storage system reach the upper limit, then renewable energy
Source, i.e. photovoltaic and wind-powered electricity generation limit Power operation；
When renewable energy power PresIt is not able to satisfy load power PloadWhen, it is discharged by battery energy storage supplement difference first, work as electricity
The power that pond energy storage SOC reaches lower limit or need to supplement has exceeded battery energy storage maximum discharge power Pes,max, start diesel engine；
If the power that residue requires supplementation with exceeds the maximum allowable power of diesel engine, diesel engine is pressed maximum power output, is pressed simultaneously
Importance ranking cuts off some insignificant property loads；If diesel engine works in power area lower limit, in order to improve the effect of diesel engine
It is pressed power area lower limit value P by rated,minOperation, if battery energy storage system is also discharging at this time, reduces discharge power, instead
It, charges to battery energy storage system.
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