CN109995040A - The method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor by energy storage - Google Patents
The method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor by energy storage Download PDFInfo
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- CN109995040A CN109995040A CN201711497539.2A CN201711497539A CN109995040A CN 109995040 A CN109995040 A CN 109995040A CN 201711497539 A CN201711497539 A CN 201711497539A CN 109995040 A CN109995040 A CN 109995040A
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- 238000004146 energy storage Methods 0.000 title claims abstract description 57
- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000004804 winding Methods 0.000 claims abstract description 9
- 230000005611 electricity Effects 0.000 claims description 9
- 238000013178 mathematical model Methods 0.000 claims description 9
- 230000009466 transformation Effects 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 description 1
- 238000010276 construction Methods 0.000 description 1
- 230000003831 deregulation Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000004807 localization Effects 0.000 description 1
- 238000004445 quantitative analysis Methods 0.000 description 1
- 238000007634 remodeling Methods 0.000 description 1
- 239000013589 supplement Substances 0.000 description 1
Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
-
- 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
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Charge And Discharge Circuits For Batteries Or The Like (AREA)
Abstract
The present invention provides dispatch the method for solving network voltage and temporarily dropping under a kind of micro-capacitance sensor by energy storage, including at least several charging stations, the charging station includes at least micro-capacitance sensor, the micro-capacitance sensor includes at least several transformers, the first winding of transformer described in several power loads and several energy storage is electrically connected to a power source, the first end of the secondary winding of transformer is electrically connected with the first end of the first end of energy storage and power load respectively, the second end of energy storage and the second end of power load are electrically connected with the secondary winding second end of transformer respectively, provide the method for dispatching under a kind of micro-capacitance sensor under a kind of micro-capacitance sensor by energy storage and solving network voltage and temporarily dropping.
Description
Technical field
The present invention relates to micro-capacitance sensor technical fields, and in particular to passes through energy storage scheduling under a kind of micro-capacitance sensor and solves network voltage
The method temporarily dropped.
Background technique
When current electric vehicle rapid charging demand is more more and more urgent, to solve, transformer dilatation is difficult, at high cost, fast charge
The problems such as causing power grid Short Term Flicker and electric car charging place are uncertain, and energy storage cannot go to solve electricity ubiquitously
The short-time energy demand of electrical automobile quick charge, it is necessary to go to solve regional electric vehicle rapid charging using distributed energy storage
Energy requirement problem, this relate to energy storage energy and power grid energy how to go distribution and energy storage inverter voltage how de-regulation control
System, reaches maximally utilizing for energy.The power load type of power grid is more, and area distribution is unbalanced, and energy storage energy is in scheduling
It must can need to find the control method that energy storage is dispatched under a kind of micro-capacitance sensor by nearest load loss part, maximize and reduce
Quick charge increases maximally utilizing for energy storage energy to the supplement of network transformer off-capacity again simultaneously.
Charger work has the characteristics that high voltage, high current, charging station complete a charging process and need about 15 minutes,
Wherein charger charging current charges by five-part form, and charger voltage dip caused by power grid may also be able to be multi-level
's.Charger power is bigger (or single module power is bigger), network voltage is temporarily dropped with flickering influence it is also bigger, to power grid impact
Also larger.Such as charging station the same period be furnished with more the type charger, theoretically simultaneously charging to it is long when power grid
A possibility that voltage dip can be greater than requirements of the national standard is very big, and otherwise entire distribution line path cannot too far, isochrone
The line resistance of the conducting wire on road will very little, it means that cost is substantially increased.It is huge that network voltage, which is temporarily dropped to electric network influencing, when long
Big, the power quality and Electrical Safety of household electrical appliance can be seriously affected.
China Patent No. CN105785227A, publication date are on July 20th, 2016, a kind of entitled voltage dip
The localization method in source, comprising: extract the instantaneous active power and instantaneous reactive power variation delta p (t) and Δ q during temporarily drop
(t), integral, which obtains, disturbs active energy Δ Ep (t) and quadergy Δ Eq (t), provides a kind of positioning side of voltage sag source
Method, disadvantage is that, it not can solve voltage dip.
Summary of the invention
The present invention is to solve the problems, such as a kind of a kind of above-mentioned micro-capacitance sensor that not can solve voltage dip, provide under micro-capacitance sensor
The method for solving network voltage and temporarily dropping is dispatched by energy storage down.
The present invention is to solve its technical problem technical solution collected to be: by energy storage scheduling solution under a kind of micro-capacitance sensor
The method that network voltage temporarily drops includes at least several charging stations, and the charging station includes at least micro-capacitance sensor, and the micro-capacitance sensor is at least
Including several transformers, several power loads and several energy storage, the first winding of the transformer is electrically connected to a power source, transformation
The first end of the secondary winding of device is electrically connected with the first end of the first end of energy storage and power load respectively, the second end of energy storage
And the second end of power load is electrically connected with the secondary winding second end of transformer respectively.
Preferably, the invention also includes following steps:
Step 1: equivalent power circuit model is established according to transformer, power load and the energy storage under micro-capacitance sensor；
Step 2: it is different from the position of transmitting transformer, energy storage website according to charging station, electricity consumption branch is reduced to three
Kind: proximal end branch, middle-end branch and remote leg calculate close according to Kirchoff s voltage loop law and current node law
Hold branch, the mathematical model of middle-end branch and remote leg；
Step 3: when charging station has charge requirement, corresponding mathematical model being selected according to the position of charging station；
Step 4: the charge requirement being calculated according to selected mathematical model and causes voltage dip value；
Step 5: judging that the voltage dip calculated can increase a certain amount of energy storage output beyond standard if beyond standard
Voltage, and go to step 4, it is performed the next step if the voltage dip value calculated is without departing from standard；
Step 6: adjusting the output voltage of energy storage according to calculated result, realize the scheduling of energy storage energy, guarantee filling for charging station
Electricity demanding will not cause network voltage temporarily to drop.
Preferably, the proximal end branch voltage and proximal end branch current includes following formula:
Wherein, io2 is proximal end branch current, and Z1 is transformer impedance, power grid of the Z2 between proximal end branch and middle-end branch
Impedance, electric network impedance of the Z3 between middle-end branch and remote leg, Z4 are energy storage impedance, and Zo1 is the resistance of proximal end branch power load
Anti-, Zo2 is the power load impedance of middle-end branch, and Zo3 is the impedance of remote leg power load, and Vi is Circuit Fault on Secondary Transformer voltage,
Vb is tank voltage, and Vo1 is proximal end branch voltage；
C=Zo1Z1+Z1Z2+Zo1Z2.
Preferably, the middle-end branch voltage and middle-end branch current includes following formula:
Wherein, io2 is middle-end branch current, and Vo2 includes middle-end branch voltage；
Preferably, the remote leg voltage and remote leg electric current includes following formula:
Wherein, io3 is remote leg electric current, and Vo3 is remote leg voltage.
Preferably, the apparent energy of the transformer is 500KVA~1MVA.
Preferably, the charging station further includes several chargers, the rated power of charger is 450KW, charging electricity
Pressure is 680V ± 20V, charging current≤500A.
Actual effect of the invention is: combining and models by model to electricity consumption end and energy storage, according to model pair
Maximally utilizing and obtaining for energy storage energy is accomplished in the energy-storage system quantitative analysis that energy is dispatched in electric car high-power charging
The larger range of covering of energy is carried out with Grid Transmission Network, reduces energy storage investment and the transformer in period utilization relatively low period
Dilatation investment has the quick universal, reasonable construction of micro-capacitance sensor, energy storage and the effective use of new energy etc. of electric car very much
Benefit.
Detailed description of the invention
Fig. 1 is to dispatch the algorithm flow chart for solving the method that network voltage temporarily drops under a kind of micro-capacitance sensor by energy storage；
Fig. 2 is to dispatch the equivalent circuit diagram for solving the method that network voltage temporarily drops under a kind of micro-capacitance sensor by energy storage.
Specific embodiment
The present invention is further illustrated with reference to the accompanying drawings and embodiments.
As shown in Figure 1, dispatching the method for solving network voltage and temporarily dropping under a kind of micro-capacitance sensor by energy storage, steps are as follows:
Step 1: equivalent power circuit model being established according to transformer, power load and the energy storage under micro-capacitance sensor, such as Fig. 2 institute
Show, Vi indication transformer in the equivalent model of Fig. 2, Vb expression energy storage, Z1 indication transformer impedance, Z4 expression energy storage impedance, Z2,
Z3 indicates that electric network impedance, Zo1, Zo2, Zo3 respectively indicate proximal end branch, middle-end branch and remote leg power load impedance, i1,
I2, i3, i4, io1, io2, io3 indicate that the electric current of each branch, Vo1, Vo2, Vo3 indicate the voltage of each branch；
Step 2: it is different from the position of transmitting transformer, energy storage website according to charging station, electricity consumption branch is reduced to three
Kind: proximal end branch, middle-end branch and remote leg calculate close according to Kirchoff s voltage loop law and current node law
End branch, the mathematical model of middle-end branch and remote leg,
Wherein:
C=Zo1Z1+Z1Z2+Zo1Z2
Step 3: when charging station has charge requirement, corresponding mathematical model being selected according to the position of charging station；
Step 4: the charge requirement being calculated according to selected mathematical model and causes voltage dip value；
Step 5: judging that the voltage dip calculated can increase a certain amount of energy storage output beyond standard if beyond standard
Voltage, and step 4 is returned to, it is performed the next step if the voltage dip value calculated is without departing from standard.
Step 6: adjusting the output voltage of energy storage according to calculated result, realize the scheduling of energy storage energy, guarantee filling for charging station
Electricity demanding will not cause network voltage temporarily to drop.
Embodiment described above is a kind of preferred version of the invention, not makees limit in any form to invention
System, there are also other variants and remodeling on the premise of not exceeding the technical scheme recorded in the claims.
Claims (7)
1. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor by energy storage, which is characterized in that include at least several
Charging station, the charging station include at least micro-capacitance sensor, if the micro-capacitance sensor include at least several transformers, several power loads and
Dry energy storage, the first winding of the transformer are electrically connected to a power source, the first end of the secondary winding of transformer respectively with energy storage
First end and power load first end electrical connection, the second end of the second end of energy storage and power load respectively with transformation
The secondary winding second end of device is electrically connected.
2. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor according to claim 1 by energy storage, it is special
Sign is, further comprising the steps of:
Step 1: equivalent power circuit model is established according to transformer, power load and the energy storage under micro-capacitance sensor；
Step 2: it is different from the position of transmitting transformer, energy storage website according to charging station, electricity consumption branch is reduced to three kinds: close
Branch, middle-end branch and remote leg are held, according to Kirchoff s voltage loop law and current node law, calculates proximal end branch
Road, the mathematical model of middle-end branch and remote leg；
Step 3: when charging station has charge requirement, corresponding mathematical model being selected according to the position of charging station；
Step 4: the charge requirement being calculated according to selected mathematical model and causes voltage dip value；
Step 5: judging that the voltage dip calculated can increase a certain amount of energy storage output electricity beyond standard if beyond standard
Pressure, and go to step 4, it is performed the next step if the voltage dip value calculated is without departing from standard；
Step 6: adjusting the output voltage of energy storage according to calculated result, realize the scheduling of energy storage energy, guarantee that the charging of charging station needs
Asking will not cause network voltage temporarily to drop.
3. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor according to claim 1 by energy storage, it is special
Sign is that the proximal end branch voltage and proximal end branch current include following formula:
Wherein, io2 is proximal end branch current, and Z1 is transformer impedance, electric network impedance of the Z2 between proximal end branch and middle-end branch,
Electric network impedance of the Z3 between middle-end branch and remote leg, Z4 are energy storage impedance, and Zo1 is the power load impedance of proximal end branch, Zo2
For middle-end branch power load impedance, Zo3 is the impedance of remote leg power load, and Vi is Circuit Fault on Secondary Transformer voltage, and Vb is storage
Energy voltage, Vo1 are proximal end branch voltage；
C=Zo1Z1+Z1Z2+Zo1Z2.
4. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor according to claim 1 by energy storage, it is special
Sign is that the middle-end branch voltage and middle-end branch current include following formula:
Wherein, io2 is middle-end branch current, and Vo2 includes middle-end branch voltage；
5. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor according to claim 1 by energy storage, it is special
Sign is that the remote leg voltage and remote leg electric current include following formula:
Wherein, io3 is remote leg electric current, and Vo3 is remote leg voltage.
6. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor according to claim 1 by energy storage, it is special
Sign is that the apparent energy of the transformer is 500KVA~1MVA.
7. the method for solving network voltage and temporarily dropping is dispatched under a kind of micro-capacitance sensor according to claim 1 by energy storage, it is special
Sign is, the charging station further includes several chargers, and the rated power of charger is 450KW, charging voltage be 680V ±
20V, charging current≤500A.
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| CN204089197U (en) * | 2014-03-07 | 2015-01-07 | 深圳市长昊机电有限公司 | The system that wind power plant reactive voltage controls |
| US20160126739A1 (en) * | 2014-11-04 | 2016-05-05 | Nec Laboratories America, Inc. | Enhancing power system voltage stability using grid energy storage for voltage support |
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