CN1508935A - Current-limiting energy-storing circuit - Google Patents
Current-limiting energy-storing circuit Download PDFInfo
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- CN1508935A CN1508935A CNA02156826XA CN02156826A CN1508935A CN 1508935 A CN1508935 A CN 1508935A CN A02156826X A CNA02156826X A CN A02156826XA CN 02156826 A CN02156826 A CN 02156826A CN 1508935 A CN1508935 A CN 1508935A
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- current
- circuit
- phase
- reactance
- accumulator
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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
- Y02E40/30—Reactive power compensation
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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
- Y02E40/40—Arrangements for reducing harmonics
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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
- Y02E70/00—Other energy conversion or management systems reducing GHG emissions
- Y02E70/30—Systems combining energy storage with energy generation of non-fossil origin
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Abstract
The circuit comprises paralleled equivalent AC source, reactor and capacitor through a connection transformer connected to system in series. The circuit is installed at line outlet of electric power system and cascaded to a breaker. Adjusting degree of resonance between inductance and capacitance can adjust degree of current limiting and compensating ratio for failure expediently. When system is in normal running, the circuit regulates systemic asymmetry, filtering, reactive compensation and active compensation as well as systemic tidal current. When system in failure, the circuit limits peak value and steady state value of short circuit current. The invention possesses features of high efficiency, simple structure, reliable. The circuit to solve too large failure current of electric system carries out power compensation. The circuit raises stability and flexibility in running condition if it is utilized in high voltage or supervoltage transmission.
Description
Technical field:
The present invention relates to a kind of current limliting accumulator that is used for transmission and distribution network, belong to electrical technology field.
Background technology:
Because power system development, the increase of load, the input of big capacity unit and power plant and converting equipment, especially the appearance of load center high-power station and large power system is interconnected, make the transmission and distribution network capacity greatly increase, simultaneously short circuit current level is increased day by day, short circuit current level has surpassed the capacity that cut-offs of present circuit breaker even.Do not controlled if do not take measures, the equipment investment of new electric substation is increased greatly but also all will produce very big influence, even need a large amount of investment of cost to transform, reconstruct and change original substation facilities in the system.
Prior art is mainly taked the short circuit current in the following method restriction electric power system transmission and distribution network:
1, the high one-level electrical network of development, low voltage electric network burst or with bus apportion, partition running, in addition with grid disconnection, and adopt dc online, these measures are not only invested very big, and relate to the challenges such as stability of electrical network, unless just have no alternative but employing.
2, adopt high-impedance transformer or series reactor.In electrical power trans mission/distribution system, adopt this measure, not only can increase network loss, also can reduce the stability of system.
3, change circuit breaker, existing electric substation is carried out capacity-increasing transformation.But cost is too big, and the existing circuit breaker capacity possibly can't meet the demands.
And because the particularity of electric energy itself, electric power system lacks energy storage and power control loop joint always.The development of at present big system and the requirement of electricity market, electric power system more and more need to carry out the power link of control flexibly.Present energy storage mode mainly contains battery energy storage, super capacitor energy storage and pumped storage.It is slow that the battery energy storage discharges and recharges speed, can not satisfy instantaneous high-power exchange, and problem of environmental pollution is arranged; Super capacitor energy storage capacity is little, and it is limited to discharge and recharge number of times; Pumped storage then is subjected to environmental limitations, and efficient is too low.And superconducting energy storage, energy storage density height, the life-span is long, and is pollution-free, is particularly suitable for short time and system and carries out high-power exchange.
Summary of the invention:
For overcoming the deficiency of prior art, the invention provides a kind of current limliting accumulator that is used for transmission and distribution network, it is simple in structure, not only has the failure current limit function, and takes into account and realize the energy storage function.
The present invention is in parallel the back by connecting the front that transformer is connected in series in circuit on power system exit circuit breaker by equivalent ac current source, reactor and capacitor.The present invention not only can carry out various stable state compensation to electric power system, that is: regulating system is asymmetric, filtering, idle and meritorious compensation and regulating system trend.When system breaks down, but limiting short-circuit current peak value and steady-state value.Simultaneously, by adjusting inductance and the electric capacity resonance degree between the two, promptly the ratio of induction reactance and capacitive reactance changes the equiva lent impedance between the two, can regulate failure current limit degree and compensativity neatly.Therefore, when enlarging the transmission and distribution network capacity, set up current limliting accumulator of the present invention, not only can limit the short circuit current in the electrical network effectively, increased the stability of system, and can significantly reduce cost of investment.
Description of drawings:
Fig. 1 is the schematic diagram of the present invention in single phase system, and AC is the single-phase output of electric power system, I
SThe equivalence ac current source, L reactor, C capacitor, T transformer, DL circuit breaker, R
LLine resistance, X
LLine reactance, Z
LoadLoad impedance;
Fig. 2 is the schematic diagram of the present invention in three-phase system, and A, B and C are the three-phase output of electric power system, I
SThe equivalence ac current source, L reactor, C capacitor, T
A, T
BWith T
CBe transformer, DL circuit breaker, R
LLine resistance, X
LLine reactance, Z
LoadLoad impedance;
Fig. 3 is the application example of the present invention in single phase system, and AC is the single-phase output of electric power system, DL circuit breaker, R
LLine resistance, X
LLine reactance, load impedance Z
Load, I
SThe equivalence ac current source, T transformer, DC controlled rectification, HTS-L inductance, G
1, G
2, G
3, G
4Be insulation gate pole bipolar transistor IGBT, L reactor, S
1, S
2S
nSwitch, C
1, C
2C
nCapacitor;
Fig. 4 is the application example of the present invention in three-phase system, the three-phase output of A, B and C electric power system, DL circuit breaker, R
LLine resistance, X
LLine reactance and Z
LoadLoad impedance, I
SThe equivalence ac current source, DC controlled rectification, HTS-L inductance, G
1, G
2, G
3, G
4, G
5With G
6Be insulation gate pole bipolar transistor IGBT, L
A, L
B,,, L
CReactance and and S
1, S
2S
nSwitch, C
1, C
2C
nCapacitor;
Embodiment:
Below in conjunction with drawings and Examples the present invention is further described:
Current limliting accumulator provided by the invention is shown in frame of broken lines among Fig. 1, Fig. 2.In Fig. 1, the present invention is connected in AC circuit on power system exit, and DL is in series with circuit breaker, and it is by equivalent ac current source I
S, after reactor L and the capacitor C parallel connection by being connected transformer T series connection connecting system; In Fig. 2 three-phase system, the present invention is connected to three-phase A, B and C line outlet place and circuit breaker DL and is in series, and three-phase is respectively by equivalent ac current source I
S, after reactor L and the capacitor C parallel connection by being connected transformer T
A, T
BWith T
CSeries connection inserts electric power system respectively.Equivalence ac current source I
SThe operating amplitude of system, all adjustable electric current of phase place can be provided, and the output current of regulating it makes itself and system power, that is to say the connection transformer T that connects in Fig. 1 single phase system in transformer T or Fig. 2 three-phase system
A, T
BWith T
CThe size of current that flows through equates that direction is opposite, and the electric current that at this moment flows through current limiting reactor L and capacitor C is zero, is equivalent to connect in Fig. 1 single phase system the connection transformer T in transformer T or Fig. 2 three-phase system
A, T
BWith T
CSecondary short circuit, that is to say that this circuit working is in holding state, does not have influence to system.When system is short-circuited fault, also promptly works as fault current and surpass equivalent ac current source I
SThe offset current that can provide, system power flow through the parallel branch that reactance L and capacitor C form at once automatically, that is to say parallel branch that reactance L and capacitor C form at once automatically input carry out failure current limit.
Equivalence ac current source I
SThe operating amplitude of system, all adjustable electric current of phase place can be provided.During systematic steady state, by controlling equivalent ac current source I
SThe electric current that amplitude, phase place are all adjustable is regulated itself and system power, also is the connection transformer T that connects in Fig. 1 single phase system in transformer T or Fig. 2 three-phase system
A, T
BWith T
COne difference is arranged between the electric current that flows through, that is: making has an electric current to flow through current limiting reactor L and capacitor C, at this moment equivalent current source I
SThe electric current that provides and the voltage at its two ends is scalable all, thus equivalent current source I
SCan carry out power or energy exchange with system, thereby can gain merit and idle compensation to system according to system requirements, filtering, the regulating system trend, the improvement system is asymmetric and improve function such as the stability of a system, i.e. and the present invention has certain energy storage function.
And, reactor L and capacitor C can be according to the needs of system balance and current limliting, by adjusting reactor L and capacitor C resonance degree---the ratio of reactor L induction reactance and capacitor C capacitive reactance between the two, change the equiva lent impedance of the two, thereby reach different compensation and current limitation effects.
Among Fig. 3 one embodiment of the present of invention.The present invention is installed on system AC line outlet place and circuit breaker DL is in series, wherein R
L, X
LWith Z
LoadBe respectively line resistance, line reactance and load impedance.Equivalence ac current source I
SBe the insulation gate pole bipolar transistor IGBT G that connects by bridge-type
1, G
2, G
3With G
4The single-phase current current transformer of forming, its DC side are controlled rectification DC and inductance HTS-L series connection, exchange outlet side and reactance L, switch S
1, S
2S
nDifference series capacitors C
1, C
2C
nThe branch road of forming is in the secondary parallel connection of single-phase connection transformer T, single-phase connection transformer T former limit series connection inserts electric power system, wherein inductance HTS-L adopts the almost nil superconduction inductance of resistance, can reduce loss greatly, improved the efficient of device, can also be common inductance, insulation gate pole bipolar transistor IGBT G
1, G
2, G
3, G
4Can also be gate level turn-off thyristor GTO, field of electric force effect transistor MOSFET and other active electric power electronic device, switch S
1, S
2S
nCan be solid-state switch or electric switch, it be used for switching capacitance C
1, C
2C
nWith the resonance degree between adjusting and the reactance L.What system flow through the superconduction inductance when normally moving is a direct current, almost lossless, and the electromagnetic energy of storing in the coil can be carried out Power Exchange by Control current source converter and system, thereby to system gain merit with idle control to system operation carry out various stable states compensation, that is to say: regulating system is asymmetric, filtering, idle and meritorious compensation and regulating system trend.When system is short-circuited fault, that is to say that fault current surpasses the offset current that equivalent ac current source can provide, system power flows through the parallel branch of reactance L and capacitor C composition at once automatically, that is to say that parallel branch that reactance L and capacitor C form drops at once automatically carries out failure current limit, but its limiting short-circuit current peak value and steady-state value make original circuit breaker to disconnect big fault current.
Fig. 4 is another embodiment of the present invention.As shown in Fig. 4 frame of broken lines, be installed on A in the electric power system, B and C three-phase line exit and circuit breaker DL and be in series, wherein R
L, X
LWith Z
LoadBe respectively each phase line resistance, line reactance and load impedance.Equivalence ac current source I
SBe the insulation gate pole bipolar transistor IGBT G that connects by bridge-type
1, G
2, G
3, G
4, G
5With G
6The three-phase current source current transformer of forming, its DC side are controlled rectification DC and inductance HTS-L series connection, the three-phase output that exchanges outlet side respectively with reactance L
A, L
BAnd L
C, switch S
1, S
2S
nDifference series capacitors C
1, C
2C
nThe three-phase branch road of forming is at three single-phase connection transformer T of the star-like connection of secondary side
A, T
BWith T
CSecondary respectively in parallel, connect transformer T
A, T
BWith T
CThe access electric power system of connecting respectively of former limit.Wherein inductance HTS-L adopts the almost nil superconduction inductance of resistance, can reduce loss greatly, and the efficient that has improved device can be the superconduction inductance, can also be common inductance, insulation gate pole bipolar transistor IGBT G
1, G
2, G
3, G
4, G
5With G
6Can also be gate level turn-off thyristor GTO, field of electric force effect transistor MOSFET and other active electric power electronic device, switch S
1, S
2S
nCan be solid-state switch or electric switch, it be used for switching capacitance C
1, C
2C
nTo regulate and reactance L respectively
A, L
BAnd L
CBetween the resonance degree.What flow through the superconduction inductance when electric power system normally moves is a direct current, almost lossless, and the electromagnetic energy of storing in the coil can be carried out Power Exchange by Control current source converter and system, thereby to system gain merit with idle control to system operation carry out various stable states compensation, that is to say: regulating system is asymmetric, filtering, idle and meritorious compensation and regulating system trend.When system is short-circuited fault, that is to say that fault current surpasses the offset current that equivalent ac current source can provide, system power flows through reactance L at once automatically
A, L
BAnd L
CWith capacitor group C
1, C
2C
nThe parallel branch of forming that is to say reactance L
A, L
BAnd L
CWith capacitor group C
1, C
2C
nAutomatically drop at once and carry out failure current limit, but its limiting short-circuit current peak value and steady-state value make original circuit breaker to disconnect big fault current.
The scheme that the equivalent ac current source that current limliting accumulator provided by the invention has adopted a controlled rectification DC and superconduction inductance HTS-L series connection back to constitute by current source converter compensates system, and reactor L and capacitor C can be according to the needs of system balance current limliting, regulate different resonance degree and reach the different compensation and the method for current limitation effect, what system flow through superconduction inductance HTS-L when normally moving is a direct current, and the electromagnetic energy of storing in the coil can be carried out Power Exchange by Control current source converter and system, thereby system is gained merit and idle control, various stable state compensation are carried out in operation to system, that is to say: regulating system is asymmetric, filtering, idle and meritorious compensation and regulating system trend.During the system failure, but its limiting short-circuit current peak value and steady-state value make original circuit breaker to disconnect big fault current.Efficient height of the present invention, simple in structure, reliable, be used for transmission and distribution network, not only solved and can carry out various power back-offs, but also solved system failure electric current problems of too, but also greatly reduce the requirement of the anti-flow of each components and parts in the system, reduced the designing requirement of system, if be used for high pressure or the supergrid flexibility of raising system greatly, stability, fail safe and reliability.
In 380V/100A three-phase system test, the inductance 50mH of superconduction inductance HTS-L, energy content is 1kJ, the reactance of current-limiting inductance L is 2 times of system impedance, and the resonance degree is 0.8 o'clock, and fault current can be restricted to the peak value about about 60% of original fault current, steady-state value about about 9%, can improve simultaneously system's degree of asymmetry of about about 50%, idle, meritorious compensation, and filtering can be controlled flexibly; When the resonance degree is 0.6, it is about about 65% that fault current can be restricted to the peak value of original fault current, and steady-state value is about about 17%, can improve system's degree of asymmetry of about about 35% simultaneously, idle, meritorious compensation, and filtering can be controlled flexibly.
Claims (5)
1. a current limliting accumulator is characterized in that it is by equivalent ac current source [I
s], reactor [L] and capacitor [C] back in parallel is by being connected transformer [T] the access circuit breaker front, circuit on power system exit of connecting.
2. by the described current limliting accumulator of claim 1, it is characterized in that adjustable inductance [L] induction reactance and capacitor [C] the capacitive reactance ratio between the two, be the resonance degree of induction reactance and capacitive reactance, change the equiva lent impedance between the two, thereby regulate failure current limit degree and compensativity.
3. by the described current limliting accumulator of claim 1, it is characterized in that the equivalent ac current source [I of current limliting accumulator
S] be current source converter, its DC side is composed in series by controlled rectification [DC] and inductance [HTS-L].
4. by the described current limliting accumulator of claim 1, it is characterized in that in single phase system, exchanging outlet side and reactance [L], switch [S
1], [S
2] ... [S
n] difference series capacitors [C
1] [C
2] ... [C
n] branch road formed is in the secondary parallel connection of single-phase connection transformer [T], single-phase connection transformer [T] former limit series connection inserts electric power system.
5. by the described current limliting accumulator of claim 1, it is characterized in that equivalent ac current source [I in three-phase electrical power system
S] exchange outlet side three-phase output respectively with reactance [L
A], [L
B] and [L
C], switch [S
1] [S
2] ... [S
n] difference series capacitors [C
1] [C
2] ... [C
n] the three-phase branch road formed is at three single-phase connection transformer [T of the star-like connection of secondary side
A], [T
B] and [T
C] secondary respectively in parallel, connect transformer [T
A], [T
B] and [T
C] the access electric power system of connecting respectively of former limit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02156826XA CN100389530C (en) | 2002-12-19 | 2002-12-19 | Current-limiting energy-storing circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNB02156826XA CN100389530C (en) | 2002-12-19 | 2002-12-19 | Current-limiting energy-storing circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1508935A true CN1508935A (en) | 2004-06-30 |
| CN100389530C CN100389530C (en) | 2008-05-21 |
Family
ID=34236420
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB02156826XA Expired - Fee Related CN100389530C (en) | 2002-12-19 | 2002-12-19 | Current-limiting energy-storing circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN100389530C (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097865A (en) * | 2011-03-25 | 2011-06-15 | 武汉大学 | Method for restoring power supply in power system |
| CN104635151A (en) * | 2014-12-29 | 2015-05-20 | 国家电网公司 | Cascade full-bridge direct-current circuit breaker low-voltage equivalent test circuit and detection method thereof |
| CN105703392A (en) * | 2016-03-08 | 2016-06-22 | 全球能源互联网研究院 | Combined type unified power flow controller |
| CN110224579A (en) * | 2019-05-16 | 2019-09-10 | 南京航空航天大学 | A kind of eGaN HEMT hybrid solenoid valve circuit and control method |
Family Cites Families (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3231837B2 (en) * | 1992-05-21 | 2001-11-26 | 東京電力株式会社 | Superconducting current limiting device |
| FR2714229A1 (en) * | 1993-12-17 | 1995-06-23 | Centre Nat Rech Scient | Current limiter for circuit protection |
| JP3044297B2 (en) * | 1997-10-01 | 2000-05-22 | 工業技術院長 | Hybrid superconducting current limiter |
| AU2001283487A1 (en) * | 2000-07-10 | 2002-01-21 | Igc-Superpower, Llc | Fault-current limiter with multi-winding coil |
-
2002
- 2002-12-19 CN CNB02156826XA patent/CN100389530C/en not_active Expired - Fee Related
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102097865A (en) * | 2011-03-25 | 2011-06-15 | 武汉大学 | Method for restoring power supply in power system |
| CN104635151A (en) * | 2014-12-29 | 2015-05-20 | 国家电网公司 | Cascade full-bridge direct-current circuit breaker low-voltage equivalent test circuit and detection method thereof |
| CN104635151B (en) * | 2014-12-29 | 2018-07-20 | 国家电网公司 | A kind of cascade full-bridge direct current breaker low pressure equivalent test circuit and its detection method |
| CN105703392A (en) * | 2016-03-08 | 2016-06-22 | 全球能源互联网研究院 | Combined type unified power flow controller |
| CN105703392B (en) * | 2016-03-08 | 2024-04-16 | 全球能源互联网研究院 | Combined type unified power flow controller |
| CN110224579A (en) * | 2019-05-16 | 2019-09-10 | 南京航空航天大学 | A kind of eGaN HEMT hybrid solenoid valve circuit and control method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN100389530C (en) | 2008-05-21 |
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