CN103915873B - A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing - Google Patents
A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing Download PDFInfo
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- CN103915873B CN103915873B CN201410125496.5A CN201410125496A CN103915873B CN 103915873 B CN103915873 B CN 103915873B CN 201410125496 A CN201410125496 A CN 201410125496A CN 103915873 B CN103915873 B CN 103915873B
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Abstract
The present invention relates to a kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing, belong to electrical equipment technical field.It is characterized in that: go out a hybrid energy-storing module based on secondary cell and ultracapacitor design, realize the energy storage requirement of transformer station direct current system with this.The present invention can give full play to the advantage of hybrid energy-storing, improves the power characteristic of transformer station direct current system, have simultaneously friendly to electrical network, environmentally friendly, can quickly respond the advantages such as high power discharge demand.
Description
Technical field
The present invention relates to a kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing, belong to power equipment skill
Art field.
Background technology
Straight-flow system in power engineering is the operation power supply of power plant and the control of transformer station, protection, signal and communicator,
Also it is the emergency power supply of various DC equipment and emergency lighting.Its direct relation the safe and reliable operation of power system, to preventing
System destruction, it is to avoid fault spread and equipment are badly damaged particularly important.Current straight-flow system is short for service life, life-time service
Causing internal resistance to increase general who has surrendered under capacity makes power output capacity be deteriorated, and additionally configures much larger than often for ensureing percussion power demand
The secondary cell of load capacity also results in significant wastage.
Along with developing rapidly of energy storage technology, the energy storage that various energy storage technologies applied research in power system is the most current
Mode has secondary cell, super capacitor, superconduction and flywheel energy storage etc., and wherein secondary cell energy storage technology maturation, low cost etc. are excellent
Point, but the energy conversion efficiency of secondary cell is low, due to the restriction of self charging and discharging currents, it is difficult to provide bigger power and
Service life is limited.Compared to secondary cell, the advantage that super capacitor has extra long life, high-energy-density and fast charging and discharging.
Flywheel energy storage system is formed main frame by flywheel, motor and converter etc. and is formed subsidiary engine by vacuum pump, refrigerating plant etc..Flywheel stores up
System can have the advantages such as input and output are quick, efficiency is high, length in service life, but the rotating speed of flywheel can not infinitely raise, this is just
Result in flywheel energy storage to be restricted.Superconducting energy storage technology has efficiently (efficiency is up to 90%), and output is big, is easily formed
High voltage, but its stability still merits attention, owing to it is the most very sensitive to temperature, electric current density and changes of magnetic field, institute
Require study with its stability.
Existing direct current transformer station is when the action simultaneously of the multiple chopper of transformer station or transformer station are in an emergency, it is desirable to secondary electricity
Pond has the power characteristic exceeding discharge-rate own, often makes secondary cell produce collapse of voltage.
Summary of the invention
It is an object of the invention to provide a kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing, with this
Replace traditional energy storage mode and realize the energy storage requirement of transformer station direct current system.
Present invention utilizes that ultracapacitor power density is big, have extended cycle life, temperature performance is good becomes with secondary cell energy storage technology
Ripe, low cost and other advantages, it is possible to thoroughly solve straight-flow system and run internal resistance increase capacity reduction power output capacity deficiency throughout the year
Problem, alleviates the problems such as straight-flow system service life short, operating ambient temperature requirement is harsh, troublesome maintenance operation cost height, carries
The safety of high straight-flow system and power characteristic, thus provide sound assurance for safe operation of power system.
The technical scheme is that
A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing, including: it is used for storing unidirectional current electric energy
Secondary battery and bank of super capacitors, for export compensate voltage inversion unit；Secondary battery is with ultracapacitor also
After connection again with cascaded inverters；Wherein, secondary battery include multiple series connection secondary cell E and by an inductance L2,
The two-way DC/DC1 changer composition of two IGBT one diode compositions of inverse parallel respectively；Secondary cell so can be allowed both may be used
Can also discharge with charging.
Bank of super capacitors includes more than one serial connected super capacitor C and by an inductance L1, two IGBT inverse parallels respectively
The two-way DC/DC2 changer composition of one diode composition；Bank of super capacitors so can be allowed both can to have charged can also put
Electricity.
Inversion unit includes: electric capacity C1 in parallel with electric capacity C1 by two groups three totally 6 IGBT and two groups three totally 6
Individual diode composition two-way AC/DC current transformer, AC/DC current transformer again with by 3 electric capacity C2, C3, C4 in parallel and point
The LC wave filter of 3 inductance L3, L4, L5 compositions the most in parallel with electric capacity C2, C3, C4；Electric capacity C1 is used for entering circuit
Row voltage stabilizing, two-way AC/DC current transformer realizes the real time charging of AC or electric discharge, LC wave filter to after inversion/rectification before
Electric current is filtered.
The present invention is when AC is accessible, and buck-boost type two-way DC/DC changer is buck characteristic, blood pressure lowering difference
Charging to super capacitor and secondary battery, when the grid collapses, buck-boost type DC/DC changer is that boost is special
Property, boosting is also discharged to electrical network.
The operation principle of the present invention:
1., time for electrical network fault-free, electric current is rectified to DC side by two-way AC/DC changer after LC wave filter, then leads to
Cross buck-boost two-way DC/DC changer blood pressure lowering to come respectively to secondary battery E and the charging of bank of super capacitors C；
The most when the grid collapses, bank of super capacitors C passes through buck-boost two-way DC/DC converter boost, rings immediately
Electrostrictive strain is stood erectly streaming system high power discharge demand, and secondary battery E passes through buck-boost two-way DC/DC converter boost,
It is then passed through two-way AC/DC changer inversion to AC, by being electrical network together with ultracapacitor C after LC filter filtering
Offer dynamic electric voltage recovers.The most both given full play to the power supply characteristic of hybrid energy-storing, and be unlikely to again to allow mixed energy storage system occur
Collapse of voltage.
It is an advantage of the current invention that:
1. the present invention can fall offer compensation for short time voltage in transformer station direct current system；
2., during grid voltage sags, the present invention can quickly respond high power discharge demand, and continuous discharge；
3. the present invention will not allow mixed energy storage system generation collapse of voltage, serves the effect extending power supply service life；
4. the present invention is friendly to electrical network, environmentally friendly.
Accompanying drawing explanation
Fig. 1 is the structural representation of present system.
Detailed description of the invention
A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing, including: it is used for storing unidirectional current electric energy
Secondary battery and bank of super capacitors, for export compensate voltage inversion unit；Secondary battery is with ultracapacitor also
After connection again with cascaded inverters；Wherein, secondary battery include multiple series connection secondary cell E and by an inductance L2,
The two-way DC/DC1 changer composition of two IGBT one diode compositions of inverse parallel respectively；Secondary cell so can be allowed both may be used
Can also discharge with charging.
Bank of super capacitors includes more than one serial connected super capacitor C and by an inductance L1, two IGBT inverse parallels respectively
The two-way DC/DC2 changer composition of one diode composition；Bank of super capacitors so can be allowed both can to have charged can also put
Electricity.
Inversion unit includes: electric capacity C1 in parallel with electric capacity C1 by two groups three totally 6 IGBT and two groups three totally 6
Individual diode composition two-way AC/DC current transformer, AC/DC current transformer again with by 3 electric capacity C2, C3, C4 in parallel and point
The LC wave filter of 3 inductance L3, L4, L5 compositions the most in parallel with electric capacity C2, C3, C4；Electric capacity C1 is used for entering circuit
Row voltage stabilizing, two-way AC/DC current transformer realizes the real time charging of AC or electric discharge, LC wave filter to after inversion/rectification before
Electric current is filtered.
The present invention is when AC is accessible, and buck-boost type two-way DC/DC changer is buck characteristic, blood pressure lowering difference
Charging to super capacitor and secondary battery, when the grid collapses, buck-boost type DC/DC changer is that boost is special
Property, boosting is also discharged to electrical network.
During electrical network fault-free, system is operated in charged state, electric current after LC wave filter by two-way AC/DC changer rectification
To DC side, at this moment buck-boost two-way DC/DC1 changer and buck-boost two-way DC/DC2 changer are that buck is special
Property reduce voltage come respectively give secondary battery C and bank of super capacitors E charging；During grid collapses, system is operated in puts
Electricity condition, at this moment buck-boost two-way DC/DC1 changer and buck-boost two-way DC/DC2 changer are that boost is special
Property, bank of super capacitors C is by buck-boost two-way DC/DC1 converter boost, and the transformer station direct current system that makes an immediate response is big
Power discharge demand, secondary battery E is passed through buck-boost two-way DC/DC2 converter boost, is then passed through two-way AC/DC
Changer inversion is to AC, by providing Dynamic-Recovery voltage for electrical network together with ultracapacitor C after LC filter filtering.
If temporarily the fall time is longer or temporary fall number of times is frequent, and bank of super capacitors C and secondary battery E voltage decline more, not enough
Recover voltage to provide, then system main circuit sends stopping signal excision load.
Claims (1)
1. a transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing, it is characterised in that including: for storing the secondary battery of unidirectional current electric energy and bank of super capacitors, for exporting the inversion unit compensating voltage；After secondary battery is in parallel with ultracapacitor again with cascaded inverters；Wherein:
Secondary battery includes the secondary cell E of multiple series connection and is made up of an inductance L2, two IGBT two-way DC/DC1 changers that one diode of inverse parallel forms respectively；
Bank of super capacitors includes more than one serial connected super capacitor C and is made up of an inductance L1, two IGBT two-way DC/DC2 changers that one diode of inverse parallel forms respectively；
Inversion unit includes: electric capacity C1 in parallel with electric capacity C1 by two groups three totally 6 IGBT and two groups three the two-way AC/DC changers that totally 6 diodes form, two-way AC/DC changer again with the LC wave filter being made up of 3 electric capacity C2, C3, C4 in parallel and 3 inductance L3, L4, L5 in parallel with electric capacity C2, C3, C4 respectively；
Two-way DC/DC changer is buck-boost type；
During electrical network fault-free, system is operated in charged state, electric current is rectified to DC side by two-way AC/DC changer after LC wave filter, and at this moment buck-boost two-way DC/DC1 changer and buck-boost two-way DC/DC2 changer are that buck characteristic reduction voltage comes respectively to secondary battery C and the charging of bank of super capacitors E；During grid collapses, system is operated in discharge condition, at this moment buck-boost two-way DC/DC1 changer and buck-boost two-way DC/DC2 changer are boost characteristic, bank of super capacitors C passes through buck-boost two-way DC/DC1 converter boost, make an immediate response transformer station direct current system high power discharge demand, secondary battery E passes through buck-boost two-way DC/DC2 converter boost, it is then passed through two-way AC/DC changer inversion to AC, by providing Dynamic-Recovery voltage for electrical network together with ultracapacitor C after LC filter filtering.
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| CN201410125496.5A CN103915873B (en) | 2014-03-28 | 2014-03-28 | A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing |
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| CN201410125496.5A CN103915873B (en) | 2014-03-28 | 2014-03-28 | A kind of transformer station direct current system based on secondary cell Yu super capacitor hybrid energy-storing |
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| CN104836455B (en) * | 2015-04-27 | 2017-07-11 | 湖南大学 | A kind of power distribution network electric power electric transformer and its control method |
| CN104917198B (en) * | 2015-06-08 | 2018-08-03 | 中车青岛四方机车车辆股份有限公司 | A kind of energy-storage system control device and method |
| CN106208725B (en) * | 2016-08-11 | 2018-08-07 | 全球能源互联网研究院有限公司 | A kind of current transformer current equalizing method and device |
| CN108306409A (en) * | 2016-09-29 | 2018-07-20 | 维谛技术有限公司 | A kind of power module, method of supplying power to and system |
| CN109103873B (en) * | 2018-10-31 | 2021-01-05 | 哈尔滨工业大学 | High-capacity direct-current energy storage device with direct-current DVR |
| CN112448395B (en) * | 2020-11-18 | 2022-05-27 | 山西大学 | Hybrid energy storage power distribution network dynamic voltage restorer and operation mode thereof |
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| CN101982918B (en) * | 2010-09-25 | 2013-01-09 | 合肥工业大学 | Direct driving wind power generation system based on double SVPWM current mode convertor and control method thereof |
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