CN102231570B - Control protection system and method of flexible AC transmission device - Google Patents

Control protection system and method of flexible AC transmission device Download PDF

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CN102231570B
CN102231570B CN2011101923049A CN201110192304A CN102231570B CN 102231570 B CN102231570 B CN 102231570B CN 2011101923049 A CN2011101923049 A CN 2011101923049A CN 201110192304 A CN201110192304 A CN 201110192304A CN 102231570 B CN102231570 B CN 102231570B
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current
electrical quantities
capacitor
measurement signal
signal respectively
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CN102231570A (en
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戴朝波
金雪芬
刘慧文
王宇红
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China Electric Power Research Institute Co Ltd CEPRI
China EPRI Science and Technology Co Ltd
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China Electric Power Research Institute Co Ltd CEPRI
China EPRI Science and Technology Co Ltd
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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
    • Y02E40/70—Smart grids as climate change mitigation technology in the energy generation sector
    • 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
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/20—Systems supporting electrical power generation, transmission or distribution using protection elements, arrangements or systems
    • 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
    • Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
    • Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
    • Y04S10/00—Systems supporting electrical power generation, transmission or distribution
    • Y04S10/22—Flexible AC transmission systems [FACTS] or power factor or reactive power compensating or correcting units

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Abstract

The invention, which relates to the control protection field of the flexible AC transmission device, discloses a control protection system and a method of a flexible AC transmission device. The control protection system comprises a data acquisition device and a control protection device. The data acquisition device is used for collecting a signal of one-time electric quantity measurement of each measurement CT and transmitting the measuring signal to the control protection device. The control protection device is used for determining whether the signal of the one-time electric quantity measurement of the each measurement CT satisfies the Kirchhoff's current law; if so, the measuring signal is used as a credible one to complete the protection treatment of primary equipment of the flexible AC transmission device. According to the disclosed control protection system and the method based on the Kirchhoff's current law (KCL), the reliability of a control protection function of a series compensation apparatus/a fault current limiter apparatus can be improved, and the unnecessary withdrawal from operation of the series compensation apparatus can be prevented, wherein the unnecessary withdrawal from operation is caused by misoperation of protection of the series compensation apparatus.

Description

Control protection system and the method for flexible AC transmission device
Technical field
The present invention relates to the control protection field of flexible AC transmission device, relate in particular to the control protection system of flexible AC transmission device and control protection system and the method for method.
Background technology
The series capacitor compensation technology of AC transmission system (being called for short string mends) is that power capacitor is series in transmission line of alternation current, the part emotional resistance of compensation transmission line of alternation current, thus reach purposes such as increasing circuit transmission capacity, the raising stability of a system, the network loss that reduces, saving investment.In remote, large capacity transmission system, increase along with transmission distance, its conveying capacity is subject to increasing restriction, and the string benefit is one of important means addressed this problem, improve ultra-high/extra-high voltage transmission line ability of supplying electric power, there is very huge economic worth, received at present application widely in the electric power system of countries in the world.
Thyristor controlled series capacitor compensation arrangement (abbreviation controlled series compensation) is regulated the equivalent impedance of fundamental frequency of controlled series compensation by the Trigger Angle that changes thyristor, the dynamic control of realization to equivalent impedance of fundamental frequency, thereby can further improve stability of power system, increase the transmission capacity of transmission line, suppress low-frequency oscillation of electric power system and subsynchronous resonance.When the ultra-high/extra-high voltage transmission line is short-circuited fault, controlled series compensation proceeds to thyristor bypass series capacitor pattern immediately, can reduce the short circuit current of system, improves the stability of electric power system.
Developing rapidly of electric power system, the load in unit and station capacity, substation capacity, city and the center of industry and the continuation of load density increase, and interconnected between electric power system, cause the short circuit current level in modern large power system electrical networks at different levels constantly to increase.Short circuit current exceeds standard becomes one of major issue that threatens the modern power systems safe operation.Except changing electric network composition, the series resonant-type fault current limiter device is to solve short circuit current exceed standard new approaches and the new way of problem.2009, the superhigh pressure fault current limiter device was at East China Power Grid 500kV bottle kiln electric substation hanging net operation, and this device is in the stage of applying.
Fixed series capacitors compensation arrangement, thyristor controlled series capacitor compensation arrangement, series resonant-type fault current limiter device etc. have the control protection system.The Main Function of controlling protection system is: detect in service various to installing disadvantageous failure condition, the relevant protection of correct operation, isolated fault timely and accurately, the safe and stable operation of assurance device, and coordinate route protection to carry out the miscellaneous equipment in protection system.In addition, control protection system also there is electrical quantities measurement and gather, the functions such as monitoring running state, record ripple, man-machine interaction.In station, should be able to realize should be able to realizing the supervision to key equipment state to supervision and the control of all key equipment states such as bypass breaker, isolating switch, grounding switch by telecontrol equipment in dispatching office.
At present, the control protection system that string is mended device is comprised of the two independently systems of overlapping usually, and two cover systems configurations are identical, independently is measured separately, data collection and control protects.When a cover system need to be overhauled or due to other reasons when out of service, what another set of system still can be stable works on, guarantee that string mends the normal operation of device.Two Redundant Control protection system outlet logic one be generally or relation, as long as one of them system meets corresponding operation condition, protection will trigger.
At present, the possibility of the protection malfunction of control protection system is larger.
Summary of the invention
In view of this, the technical problem that the present invention will solve is to provide a kind of control protection system of flexible AC transmission device, can improve the reliability of controlling defencive function.
According to an aspect of the present invention, a kind of control protection system of flexible AC transmission device is provided, described control protection system comprises data acquisition unit, control protective unit, described data acquisition unit is collected an electrical quantities measurement signal respectively measuring CT, and a described electrical quantities measurement signal respectively measuring CT is sent to described control protective unit; Described control protective unit judges whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL); if an electrical quantities measurement signal respectively measuring CT described meets Kirchhoff's current law (KCL), using a described electrical quantities measurement signal respectively measuring CT as believable measuring-signal, is completed the conservation treatment of described flexible AC transmission device primary equipment.
An embodiment of system according to the invention, described data acquisition unit is collected string and is mended the described electrical quantities measurement signal respectively measuring CT arranged in device or fault current limiter; Described string is mended in device or fault current limiter bypass breaker is set; Described control protective unit receives the state information of described bypass breaker break-make; state information in conjunction with described bypass breaker break-make judges whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL); if an electrical quantities measurement signal respectively measuring CT described meets Kirchhoff's current law (KCL), using a described electrical quantities measurement signal respectively measuring CT as believable measuring-signal, is completed the conservation treatment of described flexible AC transmission device primary equipment.
An embodiment of system according to the invention, described control protective unit comprises data summarization unit, judging unit, protected location; Wherein, described data summarization unit, respectively measure electrical quantities measurement signal of CT and the state information of bypass breaker break-make for receiving from described data acquisition unit described, by described, respectively measure electrical quantities measurement signal of CT and the state information of bypass breaker break-make sends to described judging unit; Described judging unit, for receiving the state information of bypass breaker break-make, state information in conjunction with described bypass breaker break-make judges whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), if meet, a described electrical quantities measurement signal respectively measuring CT sent to described protected location; Described protected location receives a described electrical quantities measurement signal respectively measuring CT, according to a described electrical quantities measurement signal respectively measuring CT, carries out protection algorithm and control strategy, output protection action command.
An embodiment of system according to the invention, described string mend string in device or fault current limiter mend circuit arrange capacitor and with the metal oxide pressure-limiting device MOV of described Parallel-connected Capacitor; In the device main circuit that comprises described metal oxide pressure-limiting device MOV and capacitor etc., select electric current to converge node A, described judging unit judges in conjunction with the state information of described bypass breaker break-make whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), be specially: when described bypass breaker during in open mode, whether the absolute value of algebraical sum that the described electric current of all inflows of described judgment unit judges converges the electric current of node A is less than δ, and duration T; Wherein, δ, T are threshold value.
An embodiment of system according to the invention; when bypass breaker in closure state; described judging unit does not carry out the judgement of the signal true and false; a described electrical quantities measurement signal respectively measuring CT is sent to described protected location, and described protection is single uses a described electrical quantities measurement signal respectively measuring CT to carry out protection algorithm and control strategy.
An embodiment of system according to the invention, a described electrical quantities measurement signal respectively measuring CT comprises line current i 1ine, the platform current i pf, condenser current i c, MOV branch current i mOV1and i mOV2, the GAP current i gAP; ; Described judging unit judges in conjunction with the state information of described bypass breaker break-make whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), be specially: if bypass breaker in open mode, whether described judgment unit judges meets:
| i line+ i pf+ i c+ i mOV1+ i mOV2+ i gAP|<δ, and duration T;
Wherein, described line current i 1ine, the platform current i pf, condenser current i c, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node A.
An embodiment of system according to the invention, when bypass breaker in open mode, when
Figure BDA0000074819230000041
and during lasting long period T1 (escaping single-pole reclosing), the measurement CT of the measurement CT of described judgment unit judges line current and capacitor is abnormal; Perhaps, when bypass breaker in open mode, the platform current i pf=0, MOV branch current i mOV1=0, i mOV2=0, GAP current i gAP=0, and
Figure BDA0000074819230000042
and during lasting short period T2, the measurement CT of the measurement CT of the described circuit of described judgment unit judges and described capacitor is abnormal;
Wherein, described
Figure BDA0000074819230000043
for the electric current of circuit, described
Figure BDA0000074819230000044
for the electric current on capacitor, ζ, T1, T2 is judgment threshold, and described
Figure BDA0000074819230000045
the platform current i pf, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node A.
An embodiment of system according to the invention, described judging unit is deployed in described protected location, or described judging unit is deployed in described data summarization unit.
System of the present invention adopts Kirchhoff's current law (KCL) to be judged to the current signal of measuring CT, has effectively prevented the generation of protection misoperation.
Another technical problem that the present invention will solve is to provide the control guard method of flexible AC transmission device, can improve the reliability of controlling defencive function.
According to an aspect of the present invention, provide a kind of control guard method of flexible AC transmission device, collect an electrical quantities measurement signal respectively measuring CT; Judge whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL); if an electrical quantities measurement signal respectively measuring CT described meets Kirchhoff's current law (KCL), using a described electrical quantities measurement signal respectively measuring CT as believable measuring-signal, is completed the conservation treatment of described flexible AC transmission device primary equipment.
According to an embodiment of the inventive method, collect string and mend the described electrical quantities measurement signal respectively measuring CT arranged in device or fault current limiter; Described string is mended in device or fault current limiter bypass breaker is set; Receive the state information of described bypass breaker break-make; state information in conjunction with described bypass breaker break-make judges whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL); if an electrical quantities measurement signal respectively measuring CT described meets Kirchhoff's current law (KCL), using a described electrical quantities measurement signal respectively measuring CT as believable measuring-signal, is completed the conservation treatment of described flexible AC transmission device primary equipment.
An embodiment of system according to the invention, described string mend string in device or fault current limiter mend circuit arrange capacitor and with the metal oxide pressure-limiting device MOV of described Parallel-connected Capacitor; Comprise described metal oxide pressure-limiting device MOV and capacitor etc. the device main circuit in select electric current to converge node A, described judging unit judges in conjunction with the state information of described bypass breaker break-make whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), be specially: when described bypass breaker during in open mode, whether the absolute value of algebraical sum that the described electric current of all inflows of described judgment unit judges converges the electric current of node A is less than δ, and duration T; Wherein, δ, T are threshold value.
An embodiment of system according to the invention, when bypass breaker in open mode, when
Figure BDA0000074819230000051
and during lasting long period T1 (escaping single-pole reclosing), the measurement CT of the measurement CT of described judgment unit judges line current and capacitor is abnormal; Perhaps, when bypass breaker in open mode, the platform current i pf=0, MOV branch current i mOV1=0, i mOV2=0, GAP current i gAP=0, and
Figure BDA0000074819230000052
and during lasting short period T2, the measurement CT of the measurement CT of the described circuit of described judgment unit judges and described capacitor is abnormal; Wherein, described
Figure BDA0000074819230000053
for the electric current of circuit, described
Figure BDA0000074819230000054
for the electric current on capacitor, ζ, T1, T2 is judgment threshold, and described
Figure BDA0000074819230000055
the platform current i pf, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node A.
According to an embodiment of the inventive method, described string is mended device or fault current limiter comprises: fixed series capacitors compensation arrangement, thyristor controlled series capacitor compensation arrangement, series resonant-type fault current limiter device.
The inventive method adopts the KCL law to be judged to the current signal of measuring CT, has effectively prevented the generation of protection misoperation.
The accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, below will the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skills, under the prerequisite of not paying creative work, can also obtain according to these accompanying drawings other accompanying drawing.
The string that Fig. 1 is one embodiment of the invention is mended the schematic diagram of controlling protection system in device;
The schematic diagram of the control protection system that Fig. 2 A is one embodiment of the invention;
The schematic diagram of another control protection system that Fig. 2 B is one embodiment of the invention;
The schematic diagram of another control protection system that Fig. 2 C is one embodiment of the invention;
The single-phase schematic diagram of the fixed series compensation that Fig. 3 is one embodiment of the present of invention;
Fig. 4 is the flow chart according to an embodiment of the control guard method of flexible AC transmission device of the present invention;
Fig. 5 is for carrying out the flow chart of the embodiment of KCL judgement in the control guard method according to flexible AC transmission device of the present invention;
Fig. 6 is for carrying out the flow chart of another embodiment of KCL judgement in the control guard method according to flexible AC transmission device of the present invention;
Fig. 7 is for carrying out the flow chart of another embodiment of KCL judgement in the control guard method according to flexible AC transmission device of the present invention;
Embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, rather than whole embodiment.Embodiment based in the present invention, those of ordinary skills, not making under the creative work prerequisite the every other embodiment obtained, belong to the scope of protection of the invention.
According to one embodiment of present invention; for CT is measured in the installing of current delivery equipment; the measuring-signal of measuring CT is judged by Kirchhoff's current law (KCL) KCL; if measuring-signal meets the KCL law; using measuring-signal as credible measuring-signal, for follow-up protection, control; guarantee as far as possible the reliability of measuring-signal, prevent from controlling the protection system malfunction, improve the reliability of controlling protection system.
Below in conjunction with each figure and embodiment, technical scheme of the present invention is carried out to many-sided description.
The string that Fig. 1 is one embodiment of the invention is mended the schematic diagram of controlling protection system in device.String is mended configuration in device and is controlled protection system system 12, also can control the protection system independent operatings to protection system system 12 redundant configuration control system 13, two covers, is independently measured, data collection and control protects.Take system 12 as example, and data acquisition unit 121 is measured the CT11 collection signal from each, and the electrical quantities measurement signal that each is measured to CT is sent to control protective unit 122; Whether the electrical quantities measurement signal that CT is respectively measured in control protective unit 122 judgements meets Kirchhoff's current law (KCL); meet Kirchhoff's current law (KCL) if respectively measure the electrical quantities measurement signal of CT, using the electrical quantities measurement signal of each measurement CT as believable measuring-signal, completed the conservation treatment of flexible AC transmission device primary equipment.If, when judgement has fault, 122 pairs of circuit breakers of control protective unit/switch operation mechanism 14 sends relevant protection action command, as triggered GAP15, closing bypass breaker 16, DD17, GD18 etc.
According to one embodiment of present invention, data acquisition unit 121 is collected string and is mended the electrical quantities measurement signal respectively measuring CT11 arranged in device or fault current limiter; String is mended in device or fault current limiter bypass breaker is set; Control protective unit 122 receives the state information of bypass breaker break-make; whether an electrical quantities measurement signal respectively measuring CT in conjunction with the state information judgement of bypass breaker break-make meets Kirchhoff's current law (KCL); meet Kirchhoff's current law (KCL) if respectively measure the electrical quantities measurement signal of CT, using the electrical quantities measurement signal of each measurement CT as believable measuring-signal, completed the conservation treatment of flexible AC transmission device primary equipment.
The current signal of measuring CT is judged by the KCL theorem, then carried out corresponding primary equipment protection calculation, thus the generation of pre-anti-misoperation effectively.
Fig. 2 A is the schematic diagram for the control protection system of one embodiment of the invention.Data acquisition unit 22 is from measuring CT21....; collection signal in n; convert light signal to and send to control protective unit 23; 23 pairs of these digital signals of control protective unit are carried out the KCL judgement; with judging the protection algorithm that carrys out the finishing device primary equipment for genuine signal; monitor relevant switching value information simultaneously, when the system failure or plant failure, provide relevant protection action command.
According to one embodiment of present invention, data acquisition unit 22 comprises: EMI filter 221, and the transmission of measuring on the CT transmission line for filtering is disturbed; Signal condition unit 222, for current signal is adjusted, make its demand that meets A/D unit 223, also plays the effect that realizes again electrical isolation simultaneously; A/D unit 223, for receiving signal by analog signal and being converted to digital signal, import control protective unit 23 into by light path.
According to one embodiment of present invention, data summarization unit 231 receiving optical signals, change into the signal of telecommunication by it, and therefrom parse sampled data, and the measuring-signal that then by predetermined data format, will measure CT sends to judging unit 234; Judging unit 234 obtains bypass breaker position signalling S bCB, bypass breaker position signalling S bCBmean on off operating mode (for example, value is 0 or 1).Whether the electrical quantities measurement signal that judging unit 234 is respectively measured CT in conjunction with the state information judgement of bypass breaker break-make meets Kirchhoff's current law (KCL), meet Kirchhoff's current law (KCL) if respectively measure the electrical quantities measurement signal of CT, measuring-signal is sent to protected location 235; Protected location 235 receives believable measuring-signal, carries out protection algorithm and control strategy, the output protection action command.
According to one embodiment of present invention, selectable, judging unit 234 can obtain bypass breaker position signalling S bCB, and judge in conjunction with the state information of bypass breaker break-make whether an electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL).
According to one embodiment of present invention, control protective unit 23 can also comprise wave record playback unit 232, in the situation that fault or manually boot records current demand signal amount and switching signal amount, and realizes the playback to historical recorded wave file or user-defined file; Communications management unit 233 completes information interaction, and with the information interaction of the device such as background monitoring and information remote transmitting interface, function while issuing guidance command, school.
Fig. 2 B is the schematic diagram for another control protection system of one embodiment of the invention.As shown in the figure, alternatively, judging unit 234 is deployed in data summarization unit 231, and data summarization unit 231 can be obtained bypass breaker position signalling S bCB, judging unit 234 judges in conjunction with the state information of bypass breaker break-make whether the electrical quantities measurement signal respectively measuring CT that data summarization unit 231 receives meets Kirchhoff's current law (KCL).
Fig. 2 C is the schematic diagram for another control protection system of one embodiment of the invention.As shown in the figure, alternatively, judging unit 234 is deployed in protected location 235, and protected location 235 can obtain bypass breaker position signalling S bCB, judging unit 234 judges in conjunction with the state information of bypass breaker break-make whether the electrical quantities measurement signal respectively measuring CT from data summarization unit 231 meets Kirchhoff's current law (KCL).
The single-phase schematic diagram of the fixed series compensation that Fig. 3 is one embodiment of the present of invention, below in conjunction with Fig. 3, whether the electrical quantities measurement signal that CT is respectively measured in judgement to judging unit 234 meets the Kirchhoff's current law (KCL) detailed description of making comparisons.
It is example that the capacitor of herein only take adopts the fixed series capacitors compensation arrangement of single H bridge-type connection, and this string is mended each main equipment of device and all install and measure CT except bypass breaker; As shown in Figure 3, the power circuit system comprises bypass breaker 31, spark gap 32, the damping circuit 33 be comprised of resistance R 331 and MOV332, platform 34, capacitor 35, bus 36, dispose on the line and measure CT1-7, be used for respectively the current value on different circuits in measuring system, wherein, the MOV branch road comprises MOVA and MOVB.The capacitor two ends that the string of string benefit device or fault current limiter is mended in circuit are respectively high potential and electronegative potential, all measurement CT are installed in low potential side, the low potential side of mending in circuit at string selects electric current to converge node A, makes the electric current of the measurement CT of the electric current of measurement CT of capacitor and metal oxide pressure-limiting device MOV can flow into described node A.
According to Kirchhoff's current law (KCL), " in lumped-circuit, any moment, to arbitrary node, the algebraical sum identically vanishing of the branch current of all inflow nodes ".
For node A, line current i 1ine, the platform current i pf, condenser current i c, the MOV current i mOV1and i mOV2, the GAP current i gAP, the bypass breaker current i bCBsum is zero.That is:
i line+i pf+i c+i MOV1+i MOV2+i GAP+i BCB＝0 (1)
Due to the factors such as error of the difference of measuring CT measure error, modulate circuit, AD conversion, above formula can not equal zero on stricti jurise, but should be one close to zero value, and in certain scope δ.Formula (1) is in practice
|i line+i pf+i c+i MOV1+i MOV2+i GAP+i BCB|＜δ (2)
According to formula (2), the signal value of each sampling instant is carried out to node-by-node algorithm, can according to experimental data or in the past the corresponding recorder data of engineering choose suitable δ, and lasting regular hour T, to prevent erroneous judgement.
Because bypass breaker does not does not install and measure CT, can't record i bCB, and the folding condition of bypass breaker is available, so introduce bypass breaker mode bit S in criterion bCB(S bCB=0 means that bypass breaker is in open mode, S bCB=1 means that bypass breaker is in closure state), S bCB=0 o'clock, bypass breaker current i namely bCB=0 o'clock, employing formula (2) was carried out the judgement of the signal true and false, at the bypass breaker state, when closing, did not carry out the judgement of the signal true and false.
In addition, when the string revisal often moves, only have circuit and capacitor current flowing, concerning node A, phasor meets
I &CenterDot; line + I &CenterDot; c - - - ( 3 )
Same, above formula can not equal zero on stricti jurise, but should be also one close to zero value, and in certain scope ζ.Formula (3) is in practice:
| I &CenterDot; line + I &CenterDot; c | > &zeta; - - - ( 4 )
Because the algorithm itself that calculates power frequency component has certain anti-interference, therefore, desirable relatively less of deviation ζ, and can be by the lengthening of judgement duration, in order to escape the single-pole reclosing time; Perhaps with other branch currents, combine, select the shorter duration.This criterion only, for judging that line current is measured CT and whether condenser current CT is abnormal, is not used in the rejecting misdata.
Sum up above-mentioned judgement, can draw:
1, S bCB=0 and | i line+ i pf+ i c+ i mOV1+ i mOV2+ i gAP|<δ, duration T, work as bypass breaker in open mode, and the absolute value that the electric current algebraic value of all inflow node A is sued for peace is less than δ, and duration T, judge that described measuring-signal is as believable measuring-signal, use described measuring-signal to carry out protection algorithm and control strategy, otherwise signal is deleted;
2, work as S bCB=0, and the string revisal is while often moving, and the electric current on circuit is
Figure BDA0000074819230000103
electric current on described capacitor is
Figure BDA0000074819230000104
and
Figure BDA0000074819230000105
and lasting long period T (as 1s);
Perhaps work as S bCB=0, and the string revisal only has on capacitor and circuit electric current is arranged, be i.e. i while often moving pf=0, i mOV1=0, i mOV2=0, i gAP=0, now judgement
Figure BDA0000074819230000106
and lasting short period T, judgement line current measurement CT and condenser current CT are abnormal, send line current and measure CT and condenser current CT abnormality alarming signal.
3, work as S bCB=1 o'clock, do not carry out the judgement of the signal true and false, send to protected location by the agreement of making an appointment, the protection algorithm of finishing device primary equipment after directly signal being arranged.
In criterion, the value of δ, ζ, T is chosen according to the recorder data of experimental data or former engineering in the above.
In above-described embodiment; by measuring-signal being carried out to the judgement of KCL theorem; to the measuring-signal that meets consistency judgement for follow-up conservation treatment; can reduce the possibility of MOV current protection and MOV unbalance protection generation malfunction, thereby improve the reliability that string is mended the control defencive function of device/fault current limiter device.
Fig. 4 is the flow chart according to an embodiment of the control guard method of flexible AC transmission device of the present invention.As shown in Figure 4, step 402, collect the measuring-signal of measuring CT;
Step 403, the measuring-signal of measuring CT adopts the Kirchhoff's current law (KCL) judgement;
Step 404, if measuring-signal meets the Kirchhoff's current law (KCL) judgement, processed measuring-signal as believable measuring-signal.
By using Kirchhoff's current law (KCL) judgement measuring-signal, and will judge that believable measuring-signal, for follow-up conservation treatment, can reduce the possibility of MOV current protection and MOV unbalance protection generation malfunction.
According to one embodiment of present invention, string is mended in device or fault current limiter bypass breaker is set; According to the state of described bypass breaker break-make, whether the measuring-signal that adopts the Kirchhoff's current law (KCL) judgement to measure CT is believable measuring-signal.
Fig. 5 is the flow chart according to an embodiment of the control guard method of flexible AC transmission device of the present invention.String mend string in device or fault current limiter mend circuit arrange capacitor and with the metal oxide pressure-limiting device MOV of Parallel-connected Capacitor;
Step 502, the state of judgement bypass breaker break-make;
If bypass breaker is open mode, perform step 503, select electric current to converge node A, wherein in the device main circuit that comprises metal oxide pressure-limiting device MOV and capacitor, select the A node, and make the electric current of the measurement CT of the electric current of measurement CT of capacitor and metal oxide pressure-limiting device MOV can flow into described node A;
Step 504, to the electric current algebraic value summation of all inflow node A;
Step 505, the absolute value of summed result is less than δ, and duration T, judges that measuring-signal is as believable measuring-signal, and wherein, δ, T are judgment threshold;
Step 506, used measuring-signal to carry out protection algorithm and control strategy, otherwise signal deleted
An embodiment according to the present invention, in closure state, perform step 507 when bypass breaker, do not carry out the judgement of the signal true and false, uses measuring-signal to carry out protection algorithm and control strategy.
Fig. 6 is another embodiment according to the control guard method of flexible AC transmission device of the present invention.The string benefit circuit that string is mended in device or fault current limiter arranges capacitor.
Step 602, bypass breaker is in open mode, and and duration T 1; for the electric current of circuit,
Figure BDA0000074819230000123
for the electric current on capacitor, ζ, T1 are judgment threshold;
Step 603, the measurement CT of judgement circuit and the measurement CT of capacitor are abnormal;
Fig. 7 is another embodiment according to the control guard method of flexible AC transmission device of the present invention.The string benefit circuit that string is mended in device or fault current limiter arranges capacitor.
Step 702, bypass breaker is in open mode, and the string revisal often moves, only have capacitor and with circuit on electric current is arranged, and
Figure BDA0000074819230000124
and duration T 1;
Figure BDA0000074819230000125
for line current,
Figure BDA0000074819230000126
for the electric current on capacitor, ζ, T2 are judgment threshold;
Step 703, the measurement CT of judgement circuit and the measurement CT of capacitor are abnormal;
According to one embodiment of present invention, establish
Figure BDA0000074819230000127
for line current,
Figure BDA0000074819230000128
for the electric current on capacitor, ζ, T1, T2 is judgment threshold, the platform current i pf, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node A.
When bypass breaker in open mode, i pf=0, i mOV1=0, i mOV2=0, i gAP=0, and
Figure BDA00000748192300001210
and during duration T 2, judge that the measurement CT of the measurement CT of circuit and capacitor is abnormal.
According to one embodiment of present invention, wherein T1 can be for larger value, as 1S, but the value of T2 selection of small.
Embodiment from above can find out, embodiments of the invention adopt the KCL theorem to be judged to the current signal of measuring CT, weed out rub-out signal, then carry out corresponding protection calculation, thereby improved the reliability that string is mended the control defencive function of device/fault current limiter device; Indirectly improve the environment tolerance of measuring system, guaranteed the stability of measuring system and the reliability of image data; And can prevent string to mend unnecessary out of service of device that the unit protection misoperation causes, thereby significantly improve availability factor and the utilance of package unit.
Description of the invention provides for example with for the purpose of describing, and is not exhaustively or limit the invention to disclosed form.Many modifications and variations are obvious for the ordinary skill in the art.Selecting and describing embodiment is for better explanation principle of the present invention and practical application, thereby and makes those of ordinary skill in the art can understand the various embodiment with various modifications that the present invention's design is suitable for special-purpose.

Claims (8)

1. the control protection system of a flexible AC transmission device, described control protection system comprises data acquisition unit, control protective unit, it is characterized in that:
Described data acquisition unit is collected string and is mended the electrical quantities measurement signal respectively measuring CT arranged in device or fault current limiter; Described string is mended in device or fault current limiter bypass breaker is set; Described string mend string in device or fault current limiter mend circuit arrange capacitor and with the metal oxide pressure-limiting device MOV of described Parallel-connected Capacitor; In the device main circuit that comprises described metal oxide pressure-limiting device MOV and capacitor, select electric current to converge node (A), make the electric current of the measurement CT of the electric current of measurement CT of described capacitor and described metal oxide pressure-limiting device MOV can flow into described electric current and converge node (A);
Described control protective unit comprises data summarization unit, judging unit, protected location;
Wherein, described data summarization unit, for receiving the described electrical quantities measurement signal respectively measuring CT from described data acquisition unit, send to described judging unit by a described electrical quantities measurement signal respectively measuring CT;
Described judging unit, for receiving the state information of bypass breaker break-make, state information in conjunction with described bypass breaker break-make judges whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), if meet, a described electrical quantities measurement signal respectively measuring CT sent to described protected location;
Wherein, described judging unit judges in conjunction with the state information of described bypass breaker break-make whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL) and be specially:
When described bypass breaker, during in open mode, whether the algebraical sum absolute value that the described electric current of all inflows of described judgment unit judges converges the electric current of node (A) is less than δ, and duration T; Wherein, δ, T are threshold value;
Described protected location receives a described electrical quantities measurement signal respectively measuring CT, according to a described electrical quantities measurement signal respectively measuring CT, carries out protection algorithm and control strategy, output protection action command.
2. the system as claimed in claim 1; it is characterized in that; when bypass breaker in closure state; described judging unit does not carry out the judgement of the signal true and false; a described electrical quantities measurement signal respectively measuring CT is sent to described protected location, and described protection is single uses a described electrical quantities measurement signal respectively measuring CT to carry out protection algorithm and control strategy.
3. the system as claimed in claim 1, is characterized in that,
A described electrical quantities measurement signal respectively measuring CT comprises line current i line, the platform current i pf, condenser current i c, MOV branch current i mOV1and i mOV2, the GAP current i gAP;
Described judging unit judges that in conjunction with the state information of described bypass breaker break-make whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), is specially:
If bypass breaker is in open mode, whether described judgment unit judges meets:
| i line+ i pf+ i c+ i mOV1+ i mOV2+ i gAP|<δ, and duration T;
Wherein, described line current i line, the platform current i pf, condenser current i c, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node (A).
4. system as claimed in claim 3, is characterized in that,
When bypass breaker in open mode, when and during lasting long period T1, the measurement CT of the measurement CT of described judgment unit judges line current and capacitor is abnormal;
Perhaps, when bypass breaker in open mode, the platform current i pf=0, MOV branch current i mOV1=0, i mOV2=0, GAP current i gAP=0, and
Figure FDA00003289323000022
and during lasting short period T2, the measurement CT of the measurement CT of the described circuit of described judgment unit judges and described capacitor is abnormal; Wherein, described
Figure FDA00003289323000023
for the electric current of circuit, described
Figure FDA00003289323000024
for the electric current on capacitor, ζ, T1, T2 is judgment threshold, and described
Figure FDA00003289323000025
the platform current i pf, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node (A).
5. system as claimed in claim 1, it is characterized in that: described judging unit is deployed in described protected location, or described judging unit is deployed in described data summarization unit.
6. the control guard method of a flexible AC transmission device is characterized in that:
Collect string and mend the described electrical quantities measurement signal respectively measuring CT arranged in device or fault current limiter; Described string is mended in device or fault current limiter bypass breaker is set;
Described string mend string in device or fault current limiter mend circuit arrange capacitor and with the metal oxide pressure-limiting device MOV of described Parallel-connected Capacitor; In the device main circuit that comprises described metal oxide pressure-limiting device MOV and capacitor, select electric current to converge node (A), make the electric current of the measurement CT of the electric current of measurement CT of described capacitor and described metal oxide pressure-limiting device MOV can flow into described electric current and converge node (A);
Judge whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL), if an electrical quantities measurement signal respectively measuring CT described meets Kirchhoff's current law (KCL), using a described electrical quantities measurement signal respectively measuring CT as believable measuring-signal, is completed the conservation treatment of described flexible AC transmission device primary equipment;
Describedly judge whether a described electrical quantities measurement signal respectively measuring CT meets Kirchhoff's current law (KCL) and be specially:
When described bypass breaker during in open mode, judge whether the algebraical sum absolute value that the described electric current of all inflows converges the electric current of node (A) is less than δ, and duration T;
Wherein, δ, T are threshold value.
7. method as claimed in claim 6 further comprises:
When bypass breaker in open mode, when
Figure FDA00003289323000031
, and during lasting long period T1, the measurement CT of the measurement CT of described judgment unit judges line current and capacitor is abnormal;
Perhaps, when bypass breaker in open mode platform current i pf=0, MOV branch current i mOV1=0, i mOV2=0, GAP current i gAP=0, and
Figure FDA00003289323000032
, and during lasting short period T2, the measurement CT of the measurement CT of the described circuit of described judgment unit judges and described capacitor is abnormal; Wherein, described
Figure FDA00003289323000033
for the electric current of circuit, described
Figure FDA00003289323000034
for the electric current on capacitor, ζ, T1, T2 is judgment threshold, and described
Figure FDA00003289323000035
the platform current i pf, MOV branch current i mOV1and i mOV2, the GAP current i gAPfor inflow current converges all electric currents of node (A).
8. method as claimed in claim 6 is characterized in that:
Described string is mended device or fault current limiter comprises: fixed series capacitors compensation arrangement, thyristor controlled series capacitor compensation arrangement, series resonant-type fault current limiter device.
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Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101577417A (en) * 2009-06-11 2009-11-11 西安交通大学 Method for current differential protection of direct current electric transmission line
CN101789602A (en) * 2010-01-13 2010-07-28 中国电力科学研究院 Dynamic simulation device of extra-high, ultrahigh voltage thyristor controlled series compensation device and test method thereof

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN101577417A (en) * 2009-06-11 2009-11-11 西安交通大学 Method for current differential protection of direct current electric transmission line
CN101789602A (en) * 2010-01-13 2010-07-28 中国电力科学研究院 Dynamic simulation device of extra-high, ultrahigh voltage thyristor controlled series compensation device and test method thereof

Non-Patent Citations (2)

* Cited by examiner, † Cited by third party
Title
福双线路加设TCSC对继电保护装置的影响分析;鲍伟;《华东电力》;20050531;第33卷(第5期);第55-58页 *
鲍伟.福双线路加设TCSC对继电保护装置的影响分析.《华东电力》.2005,第33卷(第5期),第55-58页.

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