CN1874100A - Line-to-line voltage compensation type current limiting energy storage circuit - Google Patents

Line-to-line voltage compensation type current limiting energy storage circuit Download PDF

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Publication number
CN1874100A
CN1874100A CNA2005100118292A CN200510011829A CN1874100A CN 1874100 A CN1874100 A CN 1874100A CN A2005100118292 A CNA2005100118292 A CN A2005100118292A CN 200510011829 A CN200510011829 A CN 200510011829A CN 1874100 A CN1874100 A CN 1874100A
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converter
current
line
voltage
brachium pontis
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CNA2005100118292A
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CN100527559C (en
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赵彩宏
黄晓华
肖立业
林良真
余运佳
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Institute of Electrical Engineering of CAS
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Institute of Electrical Engineering of CAS
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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
    • 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
    • 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
    • Y02E40/60—Superconducting electric elements or equipment; Power systems integrating superconducting elements or equipment
    • 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

Being connected to bus line at exit of AC power system wire, the disclosed circuit of energy storage through n pieces of connection transformer [T1, T2...Tn] respectively is connected in series to paralleled n pieces of general load feeder. N pieces of transformer are connected to ends at AC side of n pieces of current limiting inductance [L1, L2...Ln] and n pieces of converter. Through same DC capacitance, ends at DC side of n pieces of converter are connected. DC capacitance is also connected to voltage inversion unit of chopper. Current inversion unit of chopper is connected to superconducting coil. In normal operation of system, the invention can adjust asymmetric voltages in n pieces of feed line, and can play functions: filtering, reactive and wattful compensation, and regulating system tidal current. When system is in fault. The invention can limit peak value and steady state value in short circuit, increase value of breakdown voltage of bus, and compensate depressed voltage etc.

Description

A kind of line-to-line voltage compensation type current limiting energy storage circuit
Technical field
The present invention relates to a kind of current limliting accumulator, particularly be used for the line-to-line voltage compensation type current limiting energy storage circuit of transmission and distribution network.
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, even short circuit current level has surpassed the capacity that cut-offs of present circuit breaker.Do not controlled if do not take measures, the equipment investment of new electric substation is increased greatly, and all will be produced 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 are designed into 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 line-to-line voltage compensation type current limiting energy storage circuit 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 made up of n group connection transformer, n group current-limiting inductance, n group converter, one group of current regulator, a dc capacitor, a high temperature superconductor coil, is installed on network system line outlet place and links to each other respectively with n road feeder line, inserts network system.Characteristics of the present invention be by many groups converter be connected transformer and connect many circuit feeder lines, can compensate the short circuit and the voltage sag fault of many feeder lines simultaneously.If converter output voltage grade and current limliting voltage are complementary, then can omit the connection transformer, have only one group of dc capacitor, current regulator and superconducting coil, can save cost, simplified structure.The present invention can carry out various stable state compensation to the n bar feeder line in bus exit, that is: regulating system is asymmetric, filtering, idle and meritorious compensation and regulating system trend.When one tunnel load feeder line of system brings out existing short trouble, can drop into current-limiting inductance immediately, limiting short-circuit current peak value and steady-state value, thus reduced the impact of fault current to system, and guarantee that original circuit breaker just can reliable disengagement failure electric current.Simultaneously, organize converter more the multichannel feeder line is compensated each other, when one road feeder line generation Voltage unbalance, when harmonic wave and little voltage disturbance, another road operate as normal feeder line is kept the quality of power supply of disturbance feeder line by connecting transformer, converter and dc capacitor; When one tunnel load feeder line breaks down, the input of current-limiting inductance is limiting short-circuit current immediately, reduce the electric voltage dropping amplitude of outlet bus, many group converters can make the multichannel feeder line absorb the value of falling that the superconducting coil energy stored is used to compensate busbar voltage by current regulator simultaneously, guarantee the quality of power supply of operate as normal feeder line.Therefore, when enlarging the transmission and distribution network capacity, set up line-to-line voltage compensation type current limiting energy storage circuit 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, T 1, T 2T nConnect transformer, L 1, L 2L nCurrent-limiting inductance, converter 1, converter 2Converter nConverter, C direct current capacitor, chopper current regulator, L superconducting coil, R SLine resistance, X SLine reactance, Load 1, Load 2Load nLoad;
Fig. 2 is the application example of the present invention in single phase system, Power Grid electric power networks, Bus bus, Load 1, Load 2Load, T 1, T 2Connect transformer, L 1, L 2Current-limiting inductance, G 1, G 2G 14Be insulation gate pole bipolar transistor IGBT, D 1, D 2D 14The IGBT parasitic diode, D 15, D 16Fast recovery diode, C direct current capacitor, Tr high frequency transformer, L superconducting coil.
Embodiment
Below in conjunction with the drawings and specific embodiments the present invention is further described:
Line-to-line voltage compensation type current limiting energy storage circuit of the present invention is shown in frame of broken lines among Fig. 1.In Fig. 1, the present invention is connected in AC circuit on power system outlet bus place, is connected transformer T with the normal load feeder line of n road parallel connection by n 1, T 2T nBe in series.If converter output voltage grade and current limliting voltage are complementary, then can omit the connection transformer.N connection transformer T 1, T 2T nConnect n current-limiting inductance L respectively 1, L 2L nAnd n converter converter 1, converter 2Converter nThe interchange side, the direct current side of n converter connects by an identical dc capacitor C, dc capacitor C connects the voltage convertor unit of current regulator chopper simultaneously, the electric current convertor unit of current regulator chopper links to each other with superconducting coil L.Current regulator is by the voltage convertor unit, and the high frequency transformer Tr of electric current convertor unit and connection forms.
Converter converter 1, converter 2Converter nThe interchange side load current of the operating maximum of system can be provided, during systematic steady state, regulate converter converter 1, converter 2Converter nOutput AC voltage and current-limiting inductance L 1, L 2L nBetween the first-harmonic of difference of voltage and the amplitude and the phase place of harmonic wave, can carry out idle control to system, the improvement system is asymmetric, and system is carried out filtering, regulating system trend, and improve the stability of a system etc.If converter converter 1, converter 2Converter nOutput AC voltage and current-limiting inductance L 1, L 2L nBetween the difference of voltage be zero, promptly this circuit working does not have influence at holding state to system.When one road feeder line of system was short-circuited fault, promptly fault current surpassed converter converter 1, converter 2Converter nExchange the maximum voltage that side can provide, promptly during the product of maximum load current and current-limiting reactor, the current-limiting inductance L of faulty line 1, L 2L nAutomatically drop into immediately and carry out failure current limit, the electric voltage dropping of compensation outlet bus in the time of current limliting, but fail to make busbar voltage to reach normal value, organize converter converter more 1, converter 2Converter nCan make the multichannel feeder line absorb the value of falling that the superconducting coil energy stored is used to compensate busbar voltage by current regulator chopper simultaneously, busbar voltage is compensated to normal value, the bus quality of power supply of the feeder line that assurance is not broken down.Superconducting coil L energy produces direct voltage by the voltage convertor unit of current regulator chopper, by DC voltage-stabilizing capacitor C and converter converter 1, converter 2Converter nProduce the 50Hz alternating voltage through connecting transformer T 1, T 2T nInjected system reaches the function that bucking voltage caves in.When one road feeder line generation electric voltage frequency disturbance of system or harmonic wave, the operate as normal feeder line is by connecting transformer T 1, T 2T n, converter converter 1, converter 2Converter nWith dc capacitor C to disturbance feeder line transmission of power, keep the quality of power supply of disturbance bus.
Among Fig. 2 one embodiment of the present of invention.The present invention connects with load two-way feeder line in parallel in being installed on AC circuit on power system outlet bus place, Power grid electric power networks wherein, Bus bus, Load load, T 1, T 2Connect transformer, L 1, L 2Current-limiting inductance, G 1, G 2G 14Be insulation gate pole bipolar transistor IGBT, D 1, D 2D 14Be IGBT endophyte diode, C capacitor, Tr high frequency transformer, D 15, D 16Fast recovery diode, the L superconducting coil, wherein superconducting coil L can be the superconduct sense, can also be common inductance.Converter converter is by G 1, G 2, G 3, G 4And G 5, G 6, G 7, G 8Two groups of H bridges forming, G 1, G 2Form a brachium pontis, G 3, G 4Form another brachium pontis, two brachium pontis constitute H bridge converter; G 5, G 6Form a brachium pontis, G 7, G 8Form a brachium pontis, two brachium pontis constitute H bridge converter.Current regulator chopper is by the voltage convertor unit, and the high frequency transformer Tr of electric current convertor unit and connection forms.The voltage convertor unit is by G 11, G 12, G 13, G 14The H bridge of forming, G 11, G 13Form a brachium pontis, G 12, G 14Form another brachium pontis, its AC side connects high frequency transformer Tr one side; The electric current convertor unit is by G 9, G 10And D 15, D 16Form G 9With D 15Connect G 10With D 16Connect, constitute rectifier bridge, its AC side links to each other with the opposite side of high frequency transformer Tr, and DC side connects superconducting coil L.What system flow through superconducting coil L when normally moving is a direct current, almost lossless, and the electromagnetic energy of storing among the superconducting coil L can be carried out Power Exchange by current regulator chopper and system, thereby to system gain merit with idle control to system operation carry out various stable states compensation, that is: regulating system is asymmetric, filtering, idle and meritorious compensation and regulating system trend.When one road feeder line generation Voltage unbalance of system, harmonic disturbance, normally moving feeder line can be by connecting transformer T 1, T 2T n, converter converter 1, converter 2Converter nWith dc capacitor C to disturbance feeder line transmission of power, keep the qualified quality of power supply of disturbance feeder line.When system was short-circuited fault, promptly fault current surpassed converter converter 1, converter 2Converter nExchange the maximum voltage that side can provide, promptly during the product of maximum load current and current-limiting reactor, the current-limiting inductance L of faulty line 1, L 2Automatically drop into immediately and carry out failure current limit, the electric voltage dropping of compensation outlet bus in the time of current limliting, but fail to make busbar voltage to reach normal value, the structural design of organizing converter can make the multichannel feeder line simultaneously by current regulator converter more 1, converter 2Converter nAbsorb the value of falling that superconducting coil L energy stored is used to compensate busbar voltage, busbar voltage is compensated to normal value, the bus quality of power supply of the feeder line that assurance is not broken down.
Among the present invention, the series connection of the DC current unit of a superconducting coil L and a current regulator converter, the direct voltage unit of current regulator converter and dc capacitor C and n group converter converter 1, converter 2Converter nDC side parallel after, connect transformer by n group system carried out current limliting and compensation, current regulator chopper and superconduction inductance L can be according to the needs of system balance current limliting, regulate different duty ratios and reach different compensation and current limitation effects.What system flow through superconducting coil L when normally moving is a direct current, and the electromagnetic energy of storing among the superconducting coil L 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, be that 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 can disconnect big fault current original circuit breaker.Efficient height of the present invention, simple in structure, reliable, be used for transmission and distribution network, not only can carry out various power back-offs, but also solved system failure electric current problems of too, also greatly reduce the requirement of the anti-flow of each components and parts in the system simultaneously, reduced the designing requirement of system.Be applied to high pressure or supergrid flexibility, stability, fail safe and the reliability of raising system greatly.

Claims (4)

1, a kind of line-to-line voltage compensation type current limiting energy storage circuit is characterized in that: it is connected in AC circuit on power system outlet bus place, is connected transformer [T with the normal load feeder line of n road parallel connection by n 1, T 2T n] be in series; N connection transformer [T 1, T 2T n] connect n current-limiting inductance [L respectively 1, L 2L n] and n converter [converter 1, converter 2Converter n] the interchange side, the direct current side of n converter connects by an identical dc capacitor [C], dc capacitor [C] connects the voltage convertor unit of current regulator [chopper] simultaneously, and the electric current convertor unit of current regulator [chopper] links to each other with superconducting coil [L].
2, according to the described line-to-line voltage compensation type current limiting energy storage circuit of claim 1, it is characterized in that: described current regulator [chopper] is by the voltage convertor unit, the high frequency transformer of electric current convertor unit and connection [Tr] is formed, the voltage convertor unit insulation gate pole bipolar transistor IGBT [G that serves as reasons 11, G 12, G 13, G 14] the H bridge converter formed, [G 11], [G 13] brachium pontis of composition, [G 12], [G 14] form another brachium pontis, its AC side connects high frequency transformer [Tr] side; The electric current convertor unit is by [G 9], [G 10] and fast recovery diode [D 15], [D 16] form [G 9] and [D 15] connect [G 10] and [D 16] connect, constituting rectifier bridge, its AC side links to each other with the opposite side of high frequency transformer [Tr], and DC side connects superconducting coil [L].
3, according to the described line-to-line voltage compensation type current limiting energy storage circuit of claim 1, it is characterized in that: described converter [converter 1] by insulation gate pole bipolar transistor IGBT [G 1, G 2, G 3, G 4] and [G 5, G 6, G 7, G 8] two groups of H bridges forming, [G 1], [G 2] brachium pontis of composition, [G 3], [G 4] form another brachium pontis, two brachium pontis constitute H bridge converter; [G 5], [G 6] brachium pontis of composition, [G 7], [G 8] form another brachium pontis, two brachium pontis constitute H bridge converter.
4, according to claim 1,2 or 3 described line-to-line voltage compensation type current limiting energy storage circuits, it is characterized in that:, can omit the connection transformer if converter output voltage grade and current limliting voltage are complementary.
CNB2005100118292A 2005-06-01 2005-06-01 Line-to-line voltage compensation type current limiting energy storage circuit Expired - Fee Related CN100527559C (en)

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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102983582A (en) * 2012-12-05 2013-03-20 广东电网公司电力科学研究院 Voltage reactive-power unified compensator and control method and control system thereof
CN103219738A (en) * 2013-03-29 2013-07-24 浙江大学 Direct current transmission system based on three-pole type structure
CN108649581A (en) * 2018-06-05 2018-10-12 长沙理工大学 Multi-functional fault current limiting system between a kind of line
CN108718080A (en) * 2018-06-05 2018-10-30 长沙理工大学 A kind of multi-functional fault current active control current limiting system
RU203341U1 (en) * 2020-11-23 2021-04-01 федеральное государственное бюджетное образовательное учреждение высшего образования «Томский государственный университет систем управления и радиоэлектроники» ASYMMETRIC CURRENT POWER SUPPLY SYSTEM

Family Cites Families (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN100370668C (en) * 2002-12-19 2008-02-20 中国科学院电工研究所 Current-limiting circuit
JP4015583B2 (en) * 2003-05-14 2007-11-28 東芝三菱電機産業システム株式会社 Superconducting coil energy storage circuit
CN100440701C (en) * 2003-06-24 2008-12-03 中国科学院电工研究所 A current regulator for charging and discharging of superconducting magnet

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102983582A (en) * 2012-12-05 2013-03-20 广东电网公司电力科学研究院 Voltage reactive-power unified compensator and control method and control system thereof
CN102983582B (en) * 2012-12-05 2014-09-17 广东电网公司电力科学研究院 Voltage reactive-power unified compensator and control method and control system thereof
CN103219738A (en) * 2013-03-29 2013-07-24 浙江大学 Direct current transmission system based on three-pole type structure
CN103219738B (en) * 2013-03-29 2015-05-20 浙江大学 Direct current transmission system based on three-pole type structure
CN108649581A (en) * 2018-06-05 2018-10-12 长沙理工大学 Multi-functional fault current limiting system between a kind of line
CN108718080A (en) * 2018-06-05 2018-10-30 长沙理工大学 A kind of multi-functional fault current active control current limiting system
RU203341U1 (en) * 2020-11-23 2021-04-01 федеральное государственное бюджетное образовательное учреждение высшего образования «Томский государственный университет систем управления и радиоэлектроники» ASYMMETRIC CURRENT POWER SUPPLY SYSTEM

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