CN203117343U - Microgrid short circuit fault diagnosis system based on intelligent electric meters - Google Patents
Microgrid short circuit fault diagnosis system based on intelligent electric meters Download PDFInfo
- Publication number
- CN203117343U CN203117343U CN2013200561897U CN201320056189U CN203117343U CN 203117343 U CN203117343 U CN 203117343U CN 2013200561897 U CN2013200561897 U CN 2013200561897U CN 201320056189 U CN201320056189 U CN 201320056189U CN 203117343 U CN203117343 U CN 203117343U
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- China
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- intelligent electric
- electric meter
- meter
- isolating switch
- short circuit
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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
Abstract
The utility model provides a microgrid short circuit fault diagnosis system based on intelligent electric meters. The system comprises a photovoltaic system, a lithium battery energy storage system, a fan, a reactive compensation and active filter device, loads 1 and 2, a quick change-over switch, a meter reading concentrator, intelligent electric meters I-VII and circuit breakers I-IX, and innovation of the microgrid short circuit fault diagnosis system resides in that the system also comprises a microgrid diagnosis host, the diagnosis host is connected with the meter reading concentrator, the meter reading concentrator is connected with the intelligent electric meters I-VII, and the diagnosis host is connected with the circuit breakers I-IX. In the microgrid short circuit fault diagnosis system based on intelligent electric meters, only the microgrid diagnosis host is additionally arranged, existing intelligent electric meters in the microgrid system are used to discover and locate short circuit faults in a microgrid, operating personnel are reminded to handle, and after permission of the operating personnel, a tripping command is sent to the circuit breaker, realizing isolation of a fault subcircuit.
Description
Technical field
The utility model belongs to little electric network failure diagnosis technical field, has proposed a kind of little short circuit malfunction diagnostic system based on intelligent electric meter, finds and locate short circuit trouble point in little electrical network.
Background technology
Little electrical network is a kind of emerging generating, electricity consumption network construction form, and its service area is usually much smaller than the power distribution network with electric pressure, and the information acquisition that little electrical network adopts and the communication technology are better than the power distribution network with electric pressure usually.Yet little electrical network has the advantages that fault current is smaller, may have bidirectional current, and it is more difficult to make little electric network failure diagnosis compare with traditional power distribution network.
Little electrical network has been compared following different with traditional power distribution network: traditional power distribution network is structure radially; be in operation and have only a power supply point that lasting fault current is provided usually; even contain the dynamic elements such as induction motor of suitable composition in the load, also can oppositely not provide fault current constantly because induction motor installs reverse-power protection additional.In little electrical network everywhere can distributed power source and energy-storage battery; changed the single-phase mobile key character of power distribution network electric current; even also normal bidirectional current may occur in little electrical network of radial structure, if the configuration longitudinal differential protection then cost will significantly increase.In addition; distributed power source and energy-storage battery adopt inverter to insert little electrical network usually; under little electrical network network short fault condition, still can provide lasting fault current to the trouble spot; and because inverter current-limiting protection and control function; the fault current that makes distributed power source and energy-storage battery provide is smaller; be on close level with normal load, the overcurrent protection scheme that generally adopts in traditional power distribution network is no longer suitable.
Therefore, little electric network failure diagnosis should take to be different from the thinking of distribution network failure diagnosis.
Summary of the invention
The purpose of this utility model is at the deficiencies in the prior art, and a kind of little short circuit malfunction diagnostic system based on intelligent electric meter is provided, and is used for judging little electrical network whether be short-circuited fault and fault location point branch road.
The utility model solves its technical matters and takes following technical scheme to realize:
A kind of little short circuit malfunction diagnostic system based on intelligent electric meter, this system comprises photovoltaic system, lithium battery accumulator system, blower fan, reactive-load compensation and active filter, load 1, load 2, quick change-over switch, meter-copy collector, intelligent electric meter I～VII, isolating switch I～IX, and wherein photovoltaic system comprises intelligent electric meter II and isolating switch II; The lithium battery accumulator system comprises intelligent electric meter III and isolating switch III; Blower fan comprises intelligent electric meter IV and isolating switch IV; Reactive-load compensation and active filter comprise intelligent electric meter V and isolating switch V; Load 1 comprises that intelligent electric meter VI and isolating switch VI, VIII, load 2 comprise intelligent electric meter VII and isolating switch VII, IX, innovation of the present utility model is, this system also includes little electrical network diagnosis main frame, described diagnosis main frame is connected with meter-copy collector, and meter-copy collector is connected with intelligent electric meter I～VII respectively; Simultaneously, the diagnosis main frame is connected with isolating switch I～IX respectively.
And the diagnosis main frame is connected with meter-copy collector by the RS-485 bus, meter-copy collector by the RS-485 bus respectively be distributed in little electrical network in intelligent electric meter I～VII be connected.
And the diagnosis main frame is connected with isolating switch I～IX respectively by the Profibus fieldbus.
Advantage of the present utility model and good effect are:
The utility model is just set up little electrical network diagnosis main frame, no longer additionally add hardware device, under the situation that does not increase the system complex degree, utilize the short trouble and the location that occur in the little electrical network of the timely discovery of existing intelligent electric meter in the micro-grid system, remind the operations staff to be handled, after obtaining operations staff's permission, send trip signal to this isolating switch, realize the isolation of fault branch.
Description of drawings
Fig. 1 is the circuit diagram of the utility model system.
Embodiment
Below in conjunction with accompanying drawing the utility model embodiment is further described, need to prove, present embodiment is illustrative, is not determinate, can not be with present embodiment as to restriction of the present utility model.
A kind of little short circuit malfunction diagnostic system based on intelligent electric meter, as shown in Figure 1, this system comprise photovoltaic system, lithium battery accumulator system, blower fan, reactive-load compensation and active filter, load 1, load 2, fast change-over switch, meter-copy collector, intelligent electric meter I～VII and isolating switch I～IX wherein photovoltaic system comprise intelligent electric meter II and isolating switch II; The lithium battery accumulator system comprises intelligent electric meter III and isolating switch III; Blower fan comprises intelligent electric meter IV and isolating switch IV; Reactive-load compensation and active filter comprise intelligent electric meter V and isolating switch V;
Load 1 comprises that intelligent electric meter VI and isolating switch VI, VIII, load 2 comprise intelligent electric meter VII and isolating switch VII, IX, innovation of the present utility model is, this system also includes little electrical network diagnosis main frame, described diagnosis main frame is connected with meter-copy collector, and meter-copy collector is connected with intelligent electric meter I～VII respectively; Simultaneously, the diagnosis main frame is connected with isolating switch I～IX respectively.
In concrete enforcement of the present utility model, according to the communication module that the existing meter-copy collector of little electrical network, isolating switch I～IX have disposed, the communication module of selecting this diagnosis main frame to dispose.
Usually, meter-copy collector disposes the RS-485 bus or/and means of communications such as Industrial Ethernet, as with the host computer communication interface; The representative communication interface that meter-copy collector is communicated by letter with slave computer comprises RS-485 bus, ZigBee WLAN (wireless local area network), low voltage power line carrier, radio frequency etc.; The representative communication interface of low-voltage circuit breaker and host computer comprises fieldbus such as Profibus, DeviceNet, Modubus.
In concrete the enforcement, the diagnosis main frame is connected with meter-copy collector by the RS-485 bus; Meter-copy collector by the RS-485 bus respectively be distributed in little electrical network in whole intelligent electric meter I～VII be connected; The diagnosis main frame is connected with isolating switch I～IX respectively by the Profibus fieldbus.
Principle of work of the present utility model is:
The diagnosis main frame is every the set time, assign instruction to meter-copy collector, obtain the reading information of whole intelligent electric meters in little electrical network, the amplitude, active power, reactive power, the power factor that comprise three-phase voltage and electric current, simultaneously, the diagnosis main frame obtains all isolating switch folding conditions by fieldbus.The diagnosis main frame is according to voltage, power reading, the isolating switch folding condition of intelligent electric meter, and the little electrical network basic fixed parameter that prestores, comprise little power network line topological structure, line resistance, reactance, charging capacitor, distributed power source and the energy-storage battery permissible value under normal operating condition over the ground, carrying out conventional three-phase trend calculates, calculate electric current, the power of quick change-over switch, photovoltaic system, lithium battery accumulator system, blower fan, reactive-load compensation and active filter, load 1 and 2 branch roads of loading, and right with corresponding intelligent electric meter I ~ VII read-around ratio.If error is all in preset range, as be not more than 5%, judge that then this feeder line branch road running status is normal; If the electric current of a certain intelligent electric meter reading and its place branch road, the relative error error of power surpass in the preset range, as greater than 5%, then judge the abnormal state of this intelligent electric meter place branch road, especially, if calculate certain phase current of gained or active power greater than the intelligent electric meter reading, then judge the corresponding branch road of this intelligent electric meter this fault that is short-circuited mutually.
Claims (3)
1. little short circuit malfunction diagnostic system based on intelligent electric meter, this system comprises photovoltaic system, lithium battery accumulator system, blower fan, reactive-load compensation and active filter, load 1, load 2, quick change-over switch, meter-copy collector, intelligent electric meter I～VII, isolating switch I～IX, and wherein photovoltaic system comprises intelligent electric meter II and isolating switch II; The lithium battery accumulator system comprises intelligent electric meter III and isolating switch III; Blower fan comprises intelligent electric meter IV and isolating switch IV; Reactive-load compensation and active filter comprise intelligent electric meter V and isolating switch V; Load 1 comprises that intelligent electric meter VI and isolating switch VI, VIII, load 2 comprise intelligent electric meter VII and isolating switch VII, IX, is characterized in that:
This system also includes little electrical network diagnosis main frame, and described diagnosis main frame is connected with meter-copy collector, and meter-copy collector is connected with intelligent electric meter I～VII respectively; Simultaneously, the diagnosis main frame is connected with isolating switch I～IX respectively.
2. the little short circuit malfunction diagnostic system based on intelligent electric meter according to claim 1, it is characterized in that: the diagnosis main frame is connected with meter-copy collector by the RS-485 bus, meter-copy collector by the RS-485 bus respectively be distributed in little electrical network in intelligent electric meter I～VII be connected.
3. the little short circuit malfunction diagnostic system based on intelligent electric meter according to claim 1 is characterized in that: diagnose main frame to be connected with isolating switch I～IX respectively by the Profibus fieldbus.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200561897U CN203117343U (en) | 2013-02-01 | 2013-02-01 | Microgrid short circuit fault diagnosis system based on intelligent electric meters |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2013200561897U CN203117343U (en) | 2013-02-01 | 2013-02-01 | Microgrid short circuit fault diagnosis system based on intelligent electric meters |
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| Publication Number | Publication Date |
|---|---|
| CN203117343U true CN203117343U (en) | 2013-08-07 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN2013200561897U Expired - Lifetime CN203117343U (en) | 2013-02-01 | 2013-02-01 | Microgrid short circuit fault diagnosis system based on intelligent electric meters |
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| CN (1) | CN203117343U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569084A (en) * | 2016-11-15 | 2017-04-19 | 杭州普安科技有限公司 | Controllable characteristic load used for cable cabling accuracy detection |
| 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 |
-
2013
- 2013-02-01 CN CN2013200561897U patent/CN203117343U/en not_active Expired - Lifetime
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106569084A (en) * | 2016-11-15 | 2017-04-19 | 杭州普安科技有限公司 | Controllable characteristic load used for cable cabling accuracy detection |
| CN106569084B (en) * | 2016-11-15 | 2019-04-02 | 杭州普安科技有限公司 | A kind of controllable characteristics load for the detection of cable wiring accuracy |
| 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 |
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| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| CX01 | Expiry of patent term | ||
| CX01 | Expiry of patent term |
Granted publication date: 20130807 |