CN104218606A - Micro-power-grid central control unit - Google Patents
Micro-power-grid central control unit Download PDFInfo
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- CN104218606A CN104218606A CN201410442047.3A CN201410442047A CN104218606A CN 104218606 A CN104218606 A CN 104218606A CN 201410442047 A CN201410442047 A CN 201410442047A CN 104218606 A CN104218606 A CN 104218606A
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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
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
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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
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
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- Remote Monitoring And Control Of Power-Distribution Networks (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a micro-power-grid central control unit. The micro-power-grid central control unit is characterized by comprising a CPU (central processing unit) module, an electric parameter acquisition module, a power quality monitoring module, a data acquisition and protocol parsing module, an inverse power control module, an island detection module and other special functional modules. Through certain strategic coordinated optimization control, all distributed-type power supplies in a micro power grid are coordinated to be operated orderly, an inverter and equipment in a micro-power-grid system are subjected to continuous and smooth power regulation, the distributed-type generation power supplies and loads are controlled within a certain proportional and reasonable range, the distributed-type power generation equipment is reasonably utilized, and efficiency of the distributed-type power generation equipment is improved; meanwhile, the micro-power-grid central control unit has multiple software upgrading modes and debugging modes of network remoteness, local and the like, and maintainability and flexibility and easiness in use of the micro-power-grid control system are improved.
Description
Technical field
The present invention relates to new forms of energy distributed power generation, be specially micro-electrical network central controller of a intelligence.
Technical background
The application of distributed power source is in recent years more and more extensive, but the introducing meeting of distributed power source brings all many-sided impacts to original operation control and protection of power distribution network etc.Therefore, must further investigate the interaction mechanism of distributed power source and power distribution network.Particularly, when distributed power source energy output accounts for whole electrical network ratio when very high,, in high permeability situation, to power grid security, stability, can have a great impact, as voltage, frequency, power angle and dispatching of power netwoks etc.Angle and dispatching of power netwoks etc., between accessing that power supply exerts oneself, the intermittence that distributed power source is exerted oneself, therefore need to take into full account existing distributed generation technology and the impact of this technology on power grid security.
In addition,, due to the existence of distributed power source, traditional radioactive directed energy flow pattern, existing, not the substitute is energy in bidirectional flow pattern, injures power grid maintenance personnel and user of service's safety.Micro-electrical network refers to the network that a plurality of distributed power sources and related load thereof form according to certain topological structure, exploitation and extend the extensive access that micro-electrical network can fully promote distributed power source and regenerative resource, the highly reliable supply of realization to load various energy resources form, that micro-electrical network is that following electrical network is realized is efficient, an important means of environmental protection, quality supply, is that the useful of large electrical network supplemented.Therefore,, from power grid security and reliability angle, all need distributed power source to be managed and control.
Yet, both at home and abroad micro-grid control system research is focused mostly on aspect theoretical research, also do not have for micro-electrical network, to carry out actual research and development of products specially.
Summary of the invention
For deficiency of the prior art, the present invention proposes a kind of micro-electrical network central controller, and microgrid energy is controlled with protection and combined, and improves maintainability and the flexible ease for use of micro-grid control system.
Technical scheme of the present invention is as described below:
A microgrid central controller, is characterized in that, comprising: CPU module, electric parameter acquisition module, electric energy quality monitoring module, data acquisition and protocol analysis module, inverse probability adjustment module, isolated island detection module and other special functional module, wherein,
CPU module hardware adopts based on RISC framework technical grade ARM9 processor, and rich interface, power consumption are extremely low, disposal ability is powerful.Software adopts the method for designing of the multi-process multithreading based on Linux2.6 operating system, meets the requirement of real-time of industrial field control completely.
Electric parameter acquisition module completes the collection to grid power parameter.Comprise the data such as phase voltage, phase current, active power, reactive power, power factor, frequency, electric energy.
Electric energy quality monitoring module to and the site place electrical network quality of power supply carry out acquisition monitoring.As: degree of unbalance, THD etc.
Data acquisition, protocol analysis functional module have powerful communication capacity, integrated industry and power utility standard agreement; Comprise the agreements such as Modbus RTU, Modbus TCP, CAN2.0, DL/T645-1997/2007 agreement, electric power stipulations 101/103/104 agreement, IEC-61850 standard agreement, charging electric vehicle agreement (state's electricity, southern net), the while is compatible to IEC 60870-5-103 transmission protocol also.
Inverse probability adjustment module is by gathering and place, site power, microgrid central controller carries out the power adjustments of continuously smooth to many inverters in distributed generation system, controlling distributed power generation power supply and load is controlled in certain proportion zone of reasonableness, having reached power controls and the object of optimizing, realize reasonable use distributed power generation equipment object, improved distributed power generation device efficiency.
Isolated island detection module adopts isolated island to detect the control strategy combining with power adjustments, destroys the load balancing of original distribution system on the spot, further reduces the blind area that isolated island detects, and guarantees the O&M safety of existing electrical network.
Lonely net/grid-connected pattern the switching controls of other control strategy module microgrid, multiple-objection optimization, load prediction, failure diagnosis etc.
Its beneficial effect is: by certain policy co-ordination optimal control, guarantee all distributed power source harmonious orderlies work in microgrid.Inverter in micro-grid system and equipment are carried out to the power adjustments of continuously smooth, control distributed power generation power supply and be controlled in certain proportion zone of reasonableness with load, realize rationally use distributed power generation equipment object, improved distributed power generation device efficiency.Meanwhile, microgrid central controller has various software upgrading mode and the debud modes such as network remote, this locality, improves maintainability and the flexible ease for use of microgrid control system.
Accompanying drawing explanation
Fig. 1 is functional module structure schematic diagram of the present invention;
Fig. 2 is software general flow chart of the present invention;
Fig. 3 is that the present invention controls process flow chart;
Fig. 4 is the present invention's collection process flow chart of communicating by letter.
Embodiment
Below in conjunction with accompanying drawing, the present invention is further described.
As shown in Figure 1, the invention provides a kind of microgrid central controller, it mainly comprises seven modules:
CPU module: be arithmetic core and the control core of micro-electrical network central controller, its hardware using ARM9 processor, software adopts the method for designing of the multi-process multithreading based on built-in Linux 2.6 systems.
Electric parameter acquisition module: complete the collection to grid power parameter, comprise phase voltage, phase current, power, power factor, frequency, electric energy.
Electric energy quality monitoring module: to and the site place electrical network quality of power supply carry out acquisition monitoring.
Data acquisition and protocol analysis module: integrated industry and power utility standard agreement, comprise Modbus RTU, Modbus TCP, CAN2.0, DL/T645-1997/2007 agreement, electric power stipulations 101/103/104 agreement, IEC-61850 standard agreement, charging electric vehicle agreement, the while is compatible to IEC 60870-5-103 transmission protocol also.
Inverse probability adjustment module: by gathering and place, site power, microgrid central controller carries out the power adjustments of continuously smooth to many inverters in distributed generation system, control distributed power generation power supply and load and be controlled in certain proportion zone of reasonableness, this part does not draw in Fig. 1.
Isolated island detection module: adopt isolated island to detect the control strategy combining with power adjustments, destroy the load balancing of original distribution system on the spot, reduce the blind area that isolated island detects, guarantee the O&M safety of existing electrical network.Isolated island detection module adopts the mode that initiatively isolated island detects and the detection of passive isolated island combines, the method that wherein initiatively isolated island detects by measurement circuitry impedance realizes, passive isolated island detects and uses traditional detection way, detects the voltage at PCC point place or the method that frequency has or not unusual fluctuations and overruns.
Other special functional module: complete the miscellaneous function of micro-electrical network central controller, comprise the lonely net/grid-connected pattern switching controls of microgrid, multiple-objection optimization, load prediction, failure diagnosis.
Concrete, micro-electrical network central controller of the present invention, is comprised of software and hardware.
The hardware development of micro-electrical network central controller can be divided into CPU module, DI/DO module, power module, RS485 communication module, ethernet communication module, electric parameter acquisition module.
CPU module is arithmetic core and the control core of distributed power generation central controller.
DI/DO module comprises two parts: DI partial circuit and DO partial circuit.DI partial circuit gathers switch input variable, and DO partial circuit is controlled switch output variable.The input switch amount gathering has grid-connected contactor auxiliary contact state, island protect signal etc.; The switching value of output has grid-connected contactor divide-shut brake signal and status indicator lamp signal etc.
In the design of RS485 telecommunication circuit, used MAX13487 chip, used opto-coupler chip HCPL-6000, communication loop has been carried out to insulation blocking.
The design of ethernet communication module section has adopted separate two network interface modes.The design of two network interfaces makes the access mode flexible and diverse of Inside and outside network.In addition, Ethernet interface can also upgrade for system kernel, the function such as application development.
Power unit is one of critical component of distributed power generation central controller, is related to the reliability of each chip power and the stability of circuit board, power input voltage: 24VDC.
Electric parameter acquisition module adopts power measurement special chip ADE77XX, can realize grid power parameter is measured fast; , parameters of electric power is transferred in distributed power generation central controller meanwhile, for control system, uses.
Micro-electrical network central controller system software is divided into data acquisition process, control process.All data acquisitions are placed in a process and are convenient to management, and ADE77XX needs to open separately a process.Therefore, data acquisition process adopts father and son's process mode.
Control process is enabled separately a process, realizes concrete function and comprises: inverse probability regulatory function and isolated island measuring ability.Meanwhile, control process is according to judgement process PID method, and interception data gathers running state of process, has therefore improved stability, the reliability of control algolithm.
As shown in Figure 2, the total framework of software has adopted Multiprocessing mode to software architecture block diagram, is specifically respectively: data acquisition process, control process and Web process.The separate operation of each process, has guaranteed the real-time of system task.
As shown in Figure 3, control process has adopted the mode of one process, multithreading for control process flow chart.Guaranteed the real-time of each control thread.Meanwhile, open a timer, be mainly used in the passive detection of isolated island.
As shown in Figure 4, communication collection process is also the mode that has adopted one process, multithreading to data acquisition process flow chart, specifically comprises the operation of the equipment such as serial ports, network interface, ADE7758.
Should be understood that, for those of ordinary skills, can be improved according to the above description or convert, and all these improvement and conversion all should belong to the protection range of claims of the present invention.
By reference to the accompanying drawings patent of the present invention has been carried out to exemplary description above; obviously the realization of patent of the present invention is not subject to the restrictions described above; as long as adopted the method design of patent of the present invention and the various improvement that technical scheme is carried out; or without improving, the design of patent of the present invention and technical scheme are directly applied to other occasion, all in protection scope of the present invention.
Claims (3)
1. microgrid central controller, is characterized in that, comprising: CPU module, electric parameter acquisition module, electric energy quality monitoring module, data acquisition and protocol analysis module, inverse probability adjustment module, isolated island detection module and other special functional module, wherein,
CPU module is arithmetic core and the control core of micro-electrical network central controller, its hardware using ARM9 processor, software adopts the method for designing of the multi-process multithreading based on built-in Linux 2.6 systems;
Electric parameter acquisition module completes the collection to grid power parameter, comprises phase voltage, phase current, power, power factor, frequency, electric energy;
Electric energy quality monitoring module to and the site place electrical network quality of power supply carry out acquisition monitoring;
Data acquisition and protocol analysis module integration industry and power utility standard agreement, comprise Modbus RTU, Modbus TCP, CAN2.0, DL/T645-1997/2007 agreement, electric power stipulations 101/103/104 agreement, IEC-61850 standard agreement, charging electric vehicle agreement, the while is compatible to IEC 60870-5-103 transmission protocol also;
Inverse probability adjustment module is by gathering and place, site power, and microgrid central controller carries out the power adjustments of continuously smooth to many inverters in distributed generation system, control distributed power generation power supply and load and be controlled in certain proportion zone of reasonableness;
Isolated island detection module adopts isolated island to detect the control strategy combining with power adjustments, destroys the load balancing of original distribution system on the spot, reduces the blind area that isolated island detects, and guarantees the O&M safety of existing electrical network;
Other special functional module completes the miscellaneous function of micro-electrical network central controller, comprises the lonely net/grid-connected pattern switching controls of microgrid, multiple-objection optimization, load prediction, failure diagnosis.
2. micro-electrical network central controller according to claim 1, is characterized in that, described electric parameter acquisition module section adopts power measurement special chip ADE77XX, realizes grid power parameter is measured fast.
3. micro-electrical network central controller according to claim 1, it is characterized in that, described isolated island detection module adopts the mode that initiatively isolated island detects and the detection of passive isolated island combines, the method that wherein initiatively isolated island detects by measurement circuitry impedance realizes, passive isolated island detects and uses traditional detection way, detects the voltage at PCC point place or the method that frequency has or not unusual fluctuations and overruns.
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Cited By (2)
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| CN109066665A (en) * | 2018-09-06 | 2018-12-21 | 沈阳工业大学 | A kind of data analysis trouble diagnostic method based on microgrid information flow |
| CN111313468A (en) * | 2020-03-23 | 2020-06-19 | 特变电工西安电气科技有限公司 | Modular micro-grid central controller |
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| JP2007330002A (en) * | 2006-06-06 | 2007-12-20 | Ntt Facilities Inc | Power monitoring measurement control system of micro-grid, its power monitoring measurement control method and power monitoring measurement control program |
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| CN111313468A (en) * | 2020-03-23 | 2020-06-19 | 特变电工西安电气科技有限公司 | Modular micro-grid central controller |
| CN111313468B (en) * | 2020-03-23 | 2021-10-22 | 特变电工西安电气科技有限公司 | Modular micro-grid central controller |
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