CN104009496B - A kind of dual threshold for micro-capacitance sensor anti-backflow device judges switching circuit - Google Patents
A kind of dual threshold for micro-capacitance sensor anti-backflow device judges switching circuit Download PDFInfo
- Publication number
- CN104009496B CN104009496B CN201410261116.0A CN201410261116A CN104009496B CN 104009496 B CN104009496 B CN 104009496B CN 201410261116 A CN201410261116 A CN 201410261116A CN 104009496 B CN104009496 B CN 104009496B
- Authority
- CN
- China
- Prior art keywords
- comparison module
- voltage comparison
- micro
- switching circuit
- current sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Classifications
-
- 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
Landscapes
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
- Supply And Distribution Of Alternating Current (AREA)
Abstract
The invention discloses a kind of dual threshold for micro-capacitance sensor anti-backflow device and judge switching circuit, comprise the first voltage comparison module, the second voltage comparison module, tertiary voltage comparison module, current sensor, energy storage device and DC bus, described first voltage comparison module is operated in two-way selector switch pattern, and second, third voltage comparison module described is operated in single channel and compares switching mode; Connect with described first voltage comparison module after described second voltage comparison module and the parallel connection of tertiary voltage comparison module, form switching circuit; Described energy storage device, current sensor and switching circuit access described DC bus after connecting successively, and the voltage signal that described current sensor exports is transferred to described first voltage comparison module.The present invention's access energy storage device when micro-capacitance sensor produces inverse probability consumes inverse probability, excises energy storage device thus while maximum using renewable energy power generation, avoid the switch repeatedly of energy storage device when inverse probability is eliminated.
Description
Technical field
The present invention relates to electrical engineering field, particularly relate to a kind of dual threshold for micro-capacitance sensor anti-backflow device and judge switching circuit.
Background technology
Current, energy-saving and emission-reduction, green distributed energy become the focus that the whole world is paid close attention to.But, the features such as photovoltaic distributed power supply has intermittence, randomness, response speed is slow, inertia is little, grid-connectedly easily cause voltage fluctuation and flicker afterwards, especially when large-capacity distributing power supply is incorporated to low and medium voltage distribution network, realize the power-balance of power distribution network, and ensure that power supply reliability and the quality of power supply are comparatively difficult.In order to reduce large-scale distributed power grid to the impact of outside public electric wire net and negative effect, carrying out integrating distributed generation system by micro-capacitance sensor technology, the technical barrier of the grid-connected existence of current distributed power generation can be solved well.
Micro-capacitance sensor according to and power delivery direction, site is divided into " grid-connected do not surf the Net " and " grid-connected and surf the Net " two kinds of modes.Under " grid-connected do not surf the Net " mode, micro-grid connection point power can only be carried to micro-capacitance sensor user load by public electric wire net; Under " grid-connected and online " mode, and site power can two-way flow, and the rich power of micro-capacitance sensor can flow to public electric wire net.But for adopting " grid-connected and online " micro-capacitance sensor that mode is run, its power supply characteristic shown relative to outside public electric wire net still can cause certain influence to the stable operation of electrical network, specifically mainly contains three aspects:
The first, the quality of power supply of harmonic wave to public electric wire net that power electronic equipments a large amount of in micro-capacitance sensor produces impacts.
The second, when public electric wire net breaks down, the inverse probability that micro-capacitance sensor produces can cause damage to machinery equipment, even jeopardizes the personal safety of maintainer time serious.
3rd, due to the power supply characteristic of micro-capacitance sensor, change the feature of public electric wire net single supply, radial pattern, unidirectional trend, thus make existing current protection measures no longer applicable.
For the micro-capacitance sensor adopting " grid-connected do not surf the Net " mode to run; application number be 201210173096.2 Chinese patent disclose a kind of grid-connected micro-grid system and control method thereof of not surfing the Net; prevented by micro-capacitance sensor central controller and the reverse power protection device that is arranged on points of common connection place that inverse probability is counter to be sent; ensure whole micro-grid system only to public electric wire net power taking not to public electric wire net power transmission, thus avoid micro-capacitance sensor public electric wire net impacted.But there are following 2 deficiencies in this technology:
The first, this technology exports the means of even excising distributed power source by restriction distributed power source and eliminates inverse probability, does not make full use of the energy-storage system in micro-capacitance sensor, causes the waste of regenerative resource.
Second; the switch motion of this technology is judged to be that traditional single threshold judges; due to the fluctuation of photo-voltaic power supply, the switch repeatedly of reverse power protection device may be caused in some cases, thus shorten device useful life and have impact on micro-capacitance sensor run stability.
For above policy and the state of the art, be necessary to propose a kind of switching circuit judged based on dual threshold, be applied to the reverse power protection device of micro-capacitance sensor, this becomes the direction that the applicant is devoted to study, thus when making photovoltaic power be greater than 105% of bearing power, switch is closed accesses DC bus by energy storage device, and inverse probability is carried to energy-storage system; And when photovoltaic power is less than 95% of bearing power, switch disconnects; When photovoltaic power is between 95% to 105% bearing power, the original state of holding circuit is failure to actuate.
Summary of the invention
A kind of dual threshold for micro-capacitance sensor anti-backflow device is the object of the present invention is to provide to judge switching circuit, under the prerequisite of not excising distributed power source, dual threshold switch control rule is carried out to the circuit connecting energy storage device: access energy storage device is to consume inverse probability when micro-capacitance sensor produces inverse probability, excise energy storage device when inverse probability is eliminated thus while maximum using renewable energy power generation, avoid the switch repeatedly of energy storage device.
The technical scheme realizing above-mentioned purpose is:
Dual threshold for micro-capacitance sensor anti-backflow device judges a switching circuit, comprising: the first voltage comparison module, the second voltage comparison module, tertiary voltage comparison module, current sensor, energy storage device and DC bus, wherein:
Described first voltage comparison module is operated in two-way selector switch pattern, and described second voltage comparison module and tertiary voltage comparison module are operated in single channel and compare switching mode; Connect with described first voltage comparison module after described second voltage comparison module and the parallel connection of tertiary voltage comparison module, form switching circuit;
Described energy storage device, current sensor and switching circuit access described DC bus after connecting successively, and the voltage signal that described current sensor exports is transferred to described first voltage comparison module.
The above-mentioned dual threshold for micro-capacitance sensor anti-backflow device judges that in switching circuit, the input variable of described first voltage comparison module is: the output variable of described current sensor and 0 volt of voltage;
The input variable of described second voltage comparison module is: the output variable of photo-voltaic power supply current sensor and load current sensor export × 105%;
The input variable of described tertiary voltage comparison module is: the output variable of photo-voltaic power supply current sensor and load current sensor export × 95%.
The above-mentioned dual threshold for micro-capacitance sensor anti-backflow device judges that in switching circuit, described first voltage comparison module, the second voltage comparison module and tertiary voltage comparison module comprise the two-way voltage compare chip and relay that are connected.
The above-mentioned dual threshold for micro-capacitance sensor anti-backflow device judges that in switching circuit, described energy storage device comprises lead accumulator, lithium battery and super capacitor.
The above-mentioned dual threshold for micro-capacitance sensor anti-backflow device judges that in switching circuit, described DC bus is connected with external communication electrical network by charging device.
The invention has the beneficial effects as follows: 1) the present invention have employed two judgment thresholds in the control logic of switch: countercurrent prevention system starts threshold value and countercurrent prevention system closes threshold value, generally arrange that two threshold values are current microgrid bearing power positive and negative 5 percent, thus ensureing to avoid micro-grid connection device in critical point frequent movement and energy-storage system repeated charge under the prerequisite that microgrid load normally works, extend the micro-grid system life-span.2) the present invention adopts and is integrated with data and compares and the critical piece of the voltage comparison module of relay switch as switching circuit, and price, lower than conventional DSP, ARM development board, can control the cost of product to a certain extent.3) the present invention is fully in conjunction with the feature of micro-capacitance sensor, eliminates inverse probability by the controlled access energy-storage system of switching circuit, effectively improves the utilance of renewable power supply and the validity of power supply in micro-capacitance sensor.
Accompanying drawing explanation
Fig. 1 is the mode of operation schematic diagram of voltage comparison module in the present invention;
Fig. 2 is the structure chart that dual threshold of the present invention judges switching circuit.
Embodiment
Below in conjunction with accompanying drawing, the invention will be further described.
Refer to Fig. 2, dual threshold of the present invention judges switching circuit, comprises first, second, third voltage comparison module A, B, C, current sensor 11, energy storage device 12 and DC bus 13, wherein:
Three voltage comparison module A, B, C are by two-way voltage compare chip LM393n and the integrated control module of relay moduleization, by comparing size the cut-offfing with high/low Automatic level control relay of input voltage and reference voltage, are ripe prior aries.Voltage comparator module has two kinds of mode of operations: single channel compares switching mode and two-way selector switch pattern, as shown in Figure 1.
First voltage comparison module A is operated in two-way selector switch pattern (that is: two-way selector switch), and second, third voltage comparison module B, C are operated in single channel and compare switching mode (that is: single channel compares switch).Connect with the first voltage comparison module A after second, third voltage comparison module B, C parallel connection (that is: connecting with the switch of the first voltage comparison module A after the switch in parallel of second, third voltage comparison module B, C) form switching circuit, as shown in Figure 2.
Energy storage device 12, current sensor 11 and switching circuit access DC bus 13 after connecting successively, and DC bus 13 is connected with external communication electrical network by charging device; The voltage signal that current sensor 11 exports is transferred to the first voltage comparison module A.
Energy storage device 12 comprises lead accumulator, lithium battery, super capacitor etc.
In order to complete the function that dual threshold judges, needing the connection in series-parallel of use three voltage comparator modules to combinationally use, as shown in Figure 2: the first voltage comparison module A adopts two-way selector pattern, selecting to switch between control circuit 1 and 2 according to input voltage size; Second, third voltage comparison module B, C adopt single channel to compare switching mode; This control loop is used to carry out switch control rule to the energy storage device in micro-capacitance sensor or micro battery.Following table lists input variable and the action logic of three voltage comparator modules:
In conjunction with input variable and the action logic of three voltage comparator modules described in upper table, below by the correctness of structure shown in example key diagram 2.
Arranging micro-capacitance sensor power supply generate output is P
s, micro-capacitance sensor user load capacity is P
l, it is P that countercurrent prevention system starts threshold value
a, it is P that countercurrent prevention system closes threshold value
b, generally P is set
a=P
b=0.05 × P
l.By P
sand P
lvoltage signal input voltage comparison module is separately converted to, as input variable and comparison signal by current sensor;
Initial condition circuit 2 closes, and now photovoltaic exports gross power P
sbe increased over inverse probability upper bound threshold value, i.e. P
l× 105%, then switch B, C is all closed, and control loop conducting series connection current sensor on the line exports and is greater than zero, and circuit 2 still closes, and now micro-capacitance sensor power margin is carried to energy storage device;
Work as P
sdrop to P
l× 95% ~ P
ltime between × 105%, switch B disconnects and C still closes, because circuit 1 disconnects so the state of switch B does not affect control loop;
Work as P
scontinue to drop to P
lwhen less than × 95%, namely time lower than inverse probability lower bound threshold value, switch C disconnects and causes control loop open a way, and current sensor output is zero cause circuit 1 closed circuit 2 to disconnect, now switch B still remains open, so control loop is still opened a way namely excised energy storage device;
Work as P
srise to P
l× 95%%P
ltime between × 105%, switch B still cut-off switch C closes, but disconnects so the state of switch C does not affect control loop due to circuit 2;
Work as P
scontinue to rise to P
lwhen more than × 105%, namely higher than when the threshold value of the inverse probability upper bound, switch B Closing Switch C still remains closed, and be greater than zero cause circuit 2 closed circuit 1 to disconnect because current sensor exports, control loop conducting power margin is carried to energy storage device.
Visible by above-mentioned analysis, the combinational circuit structure of the voltage comparison module shown in Fig. 2 can realize the function of dual threshold judgement, namely, when photovoltaic power is greater than 105% of bearing power, switch is closed accesses DC bus by energy storage device, and inverse probability is carried to energy-storage system; And when photovoltaic power is less than 95% of bearing power, switch disconnects; When photovoltaic power is between 95% to 105% bearing power, the original state of holding circuit is failure to actuate.
Above embodiment is used for illustrative purposes only, but not limitation of the present invention, person skilled in the relevant technique, without departing from the spirit and scope of the present invention, various conversion or modification can also be made, therefore all equivalent technical schemes also should belong to category of the present invention, should be limited by each claim.
Claims (5)
1. the dual threshold for micro-capacitance sensor anti-backflow device judges a switching circuit, it is characterized in that, comprising: the first voltage comparison module, the second voltage comparison module, tertiary voltage comparison module, current sensor, energy storage device and DC bus, wherein:
Described first voltage comparison module is operated in two-way selector switch pattern, and described second voltage comparison module and tertiary voltage comparison module are operated in single channel and compare switching mode; Connect with described first voltage comparison module after described second voltage comparison module and the parallel connection of tertiary voltage comparison module, form switching circuit;
Described energy storage device, current sensor and switching circuit access described DC bus after connecting successively, and the voltage signal that described current sensor exports is transferred to described first voltage comparison module.
2. the dual threshold for micro-capacitance sensor anti-backflow device according to claim 1 judges switching circuit, it is characterized in that,
The input variable of described first voltage comparison module is: the output variable of described current sensor and 0 volt of voltage;
The input variable of described second voltage comparison module is: the output variable of photo-voltaic power supply current sensor and load current sensor export × 105%;
The input variable of described tertiary voltage comparison module is: the output variable of photo-voltaic power supply current sensor and load current sensor export × 95%.
3. the dual threshold for micro-capacitance sensor anti-backflow device according to claim 1 and 2 judges switching circuit, it is characterized in that, described first voltage comparison module, the second voltage comparison module and tertiary voltage comparison module comprise the two-way voltage compare chip and relay that are connected.
4. the dual threshold for micro-capacitance sensor anti-backflow device according to claim 1 judges switching circuit, and it is characterized in that, described energy storage device comprises lead accumulator, lithium battery and super capacitor.
5. the dual threshold for micro-capacitance sensor anti-backflow device according to claim 1 judges switching circuit, and it is characterized in that, described DC bus is connected with external communication electrical network by charging device.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410261116.0A CN104009496B (en) | 2014-06-12 | 2014-06-12 | A kind of dual threshold for micro-capacitance sensor anti-backflow device judges switching circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201410261116.0A CN104009496B (en) | 2014-06-12 | 2014-06-12 | A kind of dual threshold for micro-capacitance sensor anti-backflow device judges switching circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN104009496A CN104009496A (en) | 2014-08-27 |
| CN104009496B true CN104009496B (en) | 2016-01-06 |
Family
ID=51370044
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201410261116.0A Active CN104009496B (en) | 2014-06-12 | 2014-06-12 | A kind of dual threshold for micro-capacitance sensor anti-backflow device judges switching circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN104009496B (en) |
Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401935A (en) * | 1982-03-04 | 1983-08-30 | Atlantic Richfield Company | Charge control apparatus and method |
| US5642030A (en) * | 1995-06-30 | 1997-06-24 | Seelye Equipment Specialists | Charge control circuit |
| JP2002058174A (en) * | 2000-08-08 | 2002-02-22 | Nippon Telegr & Teleph Corp <Ntt> | Independent solar generation system and its control method |
| CN101841163A (en) * | 2010-03-15 | 2010-09-22 | 三一电气有限责任公司 | Grid-connected wind-light combined power generation system and power generation method thereof |
| CN103683466A (en) * | 2012-09-17 | 2014-03-26 | 周锡卫 | Emergent direct supply off-grid photovoltaic power supply system based on existing photovoltaic controller |
| CN203883494U (en) * | 2014-06-12 | 2014-10-15 | 国网上海市电力公司 | Double-threshold determination switch circuit for micro-grid anti-reflux device |
-
2014
- 2014-06-12 CN CN201410261116.0A patent/CN104009496B/en active Active
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4401935A (en) * | 1982-03-04 | 1983-08-30 | Atlantic Richfield Company | Charge control apparatus and method |
| US5642030A (en) * | 1995-06-30 | 1997-06-24 | Seelye Equipment Specialists | Charge control circuit |
| JP2002058174A (en) * | 2000-08-08 | 2002-02-22 | Nippon Telegr & Teleph Corp <Ntt> | Independent solar generation system and its control method |
| CN101841163A (en) * | 2010-03-15 | 2010-09-22 | 三一电气有限责任公司 | Grid-connected wind-light combined power generation system and power generation method thereof |
| CN103683466A (en) * | 2012-09-17 | 2014-03-26 | 周锡卫 | Emergent direct supply off-grid photovoltaic power supply system based on existing photovoltaic controller |
| CN203883494U (en) * | 2014-06-12 | 2014-10-15 | 国网上海市电力公司 | Double-threshold determination switch circuit for micro-grid anti-reflux device |
Also Published As
| Publication number | Publication date |
|---|---|
| CN104009496A (en) | 2014-08-27 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102208815B (en) | Household multi-energy system and control method thereof | |
| CN202190065U (en) | Battery protective circuit | |
| CN102832661B (en) | Novel dynamic voltage sharing device for serially connected super capacitor bank | |
| CN205092592U (en) | Distributing type photovoltaic power generation and control system | |
| CN102255330A (en) | Device and method for detecting island of micro power grid system | |
| CN103401262A (en) | Wind power and battery energy storage hybrid power station as well as capacity-determining off-line simulation and on-line operation method for energy storage system | |
| CN105428735A (en) | Storage-control-integrated solar energy lithium battery module | |
| CN202794479U (en) | Failure on-line detection circuit of passive equalization circuit | |
| CN207010216U (en) | A kind of low-voltage direct breaker | |
| CN204376807U (en) | A kind of 12V is from net energy-storage system | |
| CN203747661U (en) | Pre-charge device of wind power current transformer and wind power current transformer | |
| CN203747465U (en) | Battery equalization charging device based on ZigBee wireless network | |
| CN103812140A (en) | Wind energy, solar energy and commercial power complementary electric vehicle charging system | |
| CN102097964A (en) | Photovoltaic grid-connected inverter | |
| CN103683327A (en) | Single-phase controllable series compensation device applied to low voltage ride through of fans | |
| CN202084950U (en) | Device for detecting generation of island in micro power grid system | |
| CN103326400B (en) | Countercurrent-preventing protection and control method for microgrid | |
| CN202712917U (en) | Dynamic voltage-equalizing device for novel series supercapacitor bank | |
| CN203883494U (en) | Double-threshold determination switch circuit for micro-grid anti-reflux device | |
| CN202794448U (en) | Failure on-line detection hardware feedback circuit of passive equalization circuit | |
| CN104009496B (en) | A kind of dual threshold for micro-capacitance sensor anti-backflow device judges switching circuit | |
| CN206658052U (en) | A kind of low-voltage intelligent capacitor controller and reactive compensation system | |
| CN205958659U (en) | High voltage passes through testing arrangement | |
| CN202309086U (en) | Intelligent zero-crossing switching reactive power compensation device | |
| CN203352170U (en) | A microgrid countercurrent-preventing protection system |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C06 | Publication | ||
| PB01 | Publication | ||
| C10 | Entry into substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant |