CN102231515B - Control protection method, device and system for series capacitor device - Google Patents
Control protection method, device and system for series capacitor device Download PDFInfo
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- CN102231515B CN102231515B CN2011101922972A CN201110192297A CN102231515B CN 102231515 B CN102231515 B CN 102231515B CN 2011101922972 A CN2011101922972 A CN 2011101922972A CN 201110192297 A CN201110192297 A CN 201110192297A CN 102231515 B CN102231515 B CN 102231515B
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Abstract
The invention discloses a control protection method, a control protection device and a control protection system for a series capacitor device. The series capacitor device comprises a plurality of branch circuits. A first current transformer and a second current transformer are arranged on each of the plurality of branch circuits respectively, and are the redundancy of each other. The method comprises the following steps of: receiving current signals measured at the same sampling moment by each first current transformer and each current transformer; detecting whether difference values between the current signals measured by the first and second current transformers are within a preset range or not on each branch circuit; and if the difference values between the current signals on each branch circuit are beyond the preset range, closing current protection on corresponding branch circuits. By the method, the device and the system, the current signals on each branch circuit in the series capacitor device can be accurately judged whether to be credible or not, thereby improving the protection reliability and security of the series capacitor device.
Description
Technical field
The present invention relates to AC transmission system, particularly relate to control guard method, the equipment and system of series capacitance apparatus.
Background technology
The serial connection capacitor compensating device of AC transmission system (be called for short: string is mended device) is that power capacitor is series in transmission line of alternation current, be used for the part emotional resistance of compensation transmission line of alternation current, thereby reach purposes such as increasing circuit transmission capacity, the raising stability of a system, saving investment.In remote, large capacity transmission system, increase along with transmission distance, its conveying capacity is subject to increasing restriction, and string benefit device addresses this problem, improves one of important means of ultra-high/extra-high voltage transmission line ability of supplying electric power just, therefore has very huge economic worth.String is mended device and received application widely in the electric power system of countries in the world at present.
Thyristor controlled series capacitor compensation arrangement (THYRISTOR CONTROLLED SERIES CAPACITORS, be called for short: the equivalent impedance of fundamental frequency of TCSC) by the Trigger Angle that changes thyristor, regulating TCSC, 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 was short-circuited fault, TCSC changed thyristor bypass series capacitor pattern immediately over to, can reduce the short circuit current of system, improved the stability of electric power system.
Along with 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, (FAULT CURRENT LIMITER is called for short: be FCL) to solve short circuit current exceed standard new approaches and the new way of problem the series resonant-type fault current limiter device.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 COMPENSATION is called for short: FSC), the series capacitance apparatus of TCSC, FCL etc. has similar control protection system such as the fixed series capacitors compensation arrangement.The Main Function of controlling protection system is: measures 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 the cooperation route protection carrys out the miscellaneous equipment in protection system.In addition; the functions such as the control protection system also has electrical quantities measurement and gathers, monitoring running state, record ripple, man-machine interaction; realize bypass breaker (BYPASS CIRCUIT BREAKER in station; be called for short: BCB), isolation switch (DISCONNECTOR), grounding switch (GROUNDDISCONNECTOR; be called for short: supervision and the control of all key equipment states such as GD), realize supervision to key equipment state by telecontrol equipment in dispatching office.
(METAL OXIDE VARISTOR, be called for short: MOV) overcurrent protection, MOV protecting energy, MOV temperature protection, MOV unbalance protection, spark gap (GAP) are refused trigger protection, the protection of GAP delayed trigger, capacitor unbalance protection, capacitor super-load protection etc. from trigger protection, GAP to relate generally to metal oxide pressure-limiting device such as the control protection system of the series capacitance apparatus of FSC, TCSC and FCL.Required current signal has the electric current of line current, capacitor branch current, capacitor unbalance electric current, MOV electric current and GAP usually during various defencive function more than realizing.Cause the incredible factor of current signal to have a lot, for example, (ANALOG-TO-DIGITAL is called for short: A/D) operation exception of translation exception, data summarization unit etc. for the misoperation of outside electromagnetic interference, programmable logic device, modulus.Each incredible current signal is sent to the control protection system can cause associated current protection malfunction or tripping; and whether the prior art None-identified is sent to the current signal of controlling protection system credible; therefore; can't guarantee to control the correct execution malfunction of protection system or tripping action; thereby have influence on reliability and fail safe to the series capacitor unit protection, bring unnecessary economic loss.
Summary of the invention
The present invention requires the technical problem that solves to be: provide a kind of control guard method, equipment and system of series capacitance apparatus, to improve the reliability and security to the series capacitor unit protection.
A kind of control guard method of series capacitance apparatus is provided in one aspect of the invention.Wherein the series capacitance apparatus comprises a plurality of branch roads, wherein said a plurality of branch road comprises the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in described a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and described bypass breaker branch road on each branch road in described a plurality of branch roads except the bypass breaker branch road and be in off-state, the method comprises:
Receive the current signal that described the first current transformer and the second current transformer are measured in same sampling instant respectively;
Respectively on described each branch road, detect difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range;
If the difference between the described current signal on described each branch road is in preset range, according to the set of the first current transformer that arranges on described each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road;
If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.
A kind of control protective unit of series capacitance apparatus is provided in one aspect of the invention.wherein the series capacitance apparatus comprises a plurality of branch roads, wherein said a plurality of branch road comprises the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in described a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and described bypass breaker branch road on each branch road in described a plurality of branch roads except the bypass breaker branch road and be in off-state, this control protective unit comprises receiving element, the first detecting unit and performance element, wherein:
Receiving element, be used for receiving the current signal that described the first current transformer and the second current transformer are measured in same sampling instant respectively;
The first detecting unit, be used for respectively at described each branch road, detects difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range;
Performance element, be used for the judged result according to described the first detecting unit, if the difference between the described current signal on described each branch road is in preset range, according to the set of the first current transformer that arranges on described each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road; If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.
A kind of control protection system of series capacitance apparatus is provided in one aspect of the invention.wherein the series capacitance apparatus comprises a plurality of branch roads, wherein said a plurality of branch road comprises the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in described a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and described bypass breaker branch road on each branch road in described a plurality of branch roads except the bypass breaker branch road and be in off-state, this control protection system comprises platform data acquisition system and the first protective device, wherein:
The platform data acquisition system, be used for the current signal of described a plurality of branch roads of measuring in same sampling instant respectively from each current transformer is carried out filtering, analog-to-digital conversion process, and the current signal after processing sends to the first protective device;
The first protective device, be used for receiving the current signal that described platform data acquisition system sends; Respectively on described each branch road, detect difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range; If the difference between the described current signal on described each branch road is in preset range, according to the set of the first current transformer that arranges on described each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road; If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.
the present invention is by being respectively arranged with the first current transformer (CURRENT TRANSFORMER of redundancy each other on each branch road in a plurality of branch roads the series capacitance apparatus comprises, be called for short: TA) He the second current transformer, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road in a plurality of branch roads except the bypass breaker branch road and be in off-state, the current signal of measuring in same sampling instant respectively by receiving above-mentioned the first current transformer and the second current transformer, and respectively on each branch road, detect difference between the current signal that current signal that the first current transformer measures and the second current transformer measure whether all in preset range.If the difference between the current signal on above-mentioned each branch road is in preset range; according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement; perhaps; according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road.If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.Thereby can guarantee the reliability for the current signal of current protection; and can be when the difference between the branch current signal be not insincere in preset range the current protection of locking respective branch; thereby can prevent malfunction or the tripping of current protection, improve the reliability and security of series capacitor unit protection.
Description of drawings
Fig. 1 is the flow chart of an embodiment of control guard method of series capacitance apparatus of the present invention;
Fig. 2 is the structural representation of an embodiment of series capacitance apparatus in the present invention;
Fig. 3 is the structural representation of another embodiment of series capacitance apparatus in the present invention;
Fig. 4 is the structural representation of another embodiment of series capacitance apparatus in the present invention;
Fig. 5 is the flow chart of another embodiment of control guard method of series capacitance apparatus of the present invention;
Fig. 6 is the flow chart of another embodiment of control guard method of series capacitance apparatus of the present invention;
Fig. 7 is the structural representation of an embodiment of control protective unit of series capacitance apparatus of the present invention;
Fig. 8 is the structural representation of another embodiment of control protective unit of series capacitance apparatus of the present invention;
Fig. 9 is the structural representation of another embodiment of control protective unit of series capacitance apparatus of the present invention;
Figure 10 is the structural representation of an embodiment of control protection system of series capacitance apparatus of the present invention;
Figure 11 is the structural representation of another embodiment of control protection system of series capacitance apparatus of the present invention;
Figure 12 is the structural representation of another embodiment of control protection system of series capacitance apparatus of the present invention;
Figure 13 be according to the present invention in the structural representation of another embodiment of series capacitance apparatus.
Specific embodiment
With reference to the accompanying drawings the present invention is described more fully, exemplary embodiment of the present invention wherein is described.
Fig. 1 is the flow chart of an embodiment of control guard method of series capacitance apparatus of the present invention.Wherein in this embodiment, the series capacitance apparatus comprises a plurality of branch roads, wherein a plurality of branch roads comprise the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road except the bypass breaker branch road in a plurality of branch roads and be in off-state.As shown in Figure 1, the control guard method of this embodiment series capacitance apparatus is as follows:
Step 101, receive the current signal that the first current transformer and the second current transformer are measured in same sampling instant respectively.
Step 102, respectively on each branch road, detect difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range.
Step 103; if the difference between the current signal on each branch road is in preset range; according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement; perhaps; according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on each branch road.
Step 104, if the difference between the current signal on each branch road not all in preset range, the difference between the latching current signal is the current protection of the branch road in preset range not.
the control guard method of the series capacitance apparatus that provides based on the above embodiment of the present invention, by being respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in a plurality of branch roads the series capacitance apparatus comprises, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road in a plurality of branch roads except the bypass breaker branch road and be in off-state, the current signal of measuring in same sampling instant respectively by receiving above-mentioned the first current transformer and the second current transformer, and respectively on each branch road, detect difference between the current signal that current signal that the first current transformer measures and the second current transformer measure whether all in preset range.If the difference between the current signal on above-mentioned each branch road is in preset range; according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement; perhaps; according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road.If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.Thereby can guarantee the reliability for the current signal of current protection; and can be when the difference between the branch current signal be not insincere in preset range the current protection of locking respective branch; thereby can prevent malfunction or the tripping of current protection, improve the reliability and security of series capacitor unit protection.
According to a specific embodiment of the present invention, the series capacitance apparatus can be FSC, TCSC, FCL, perhaps other similar device.Fig. 2 is the structural representation of an embodiment of series capacitance apparatus in the present invention, and in Fig. 2, the series capacitance apparatus is FSC, specifically comprises series circuit branch road, capacitor group branch road, the poor branch road of capacitor bridge, MOV branch road, GAP branch road and BCB branch road.Fig. 3 is the structural representation of another embodiment of series capacitance apparatus in the present invention, in Fig. 3, the series capacitance apparatus is TCSC, specifically comprise series circuit branch road, capacitor group branch road, the poor branch road of capacitor bridge, thyristor bypass branch, MOV branch road, GAP branch road and BCB branch road, wherein as required the GAP branch road can be arranged, also can there is no the GAP branch road.Fig. 4 is the structural representation of another embodiment of series capacitance apparatus in the present invention, in Fig. 4, the series capacitance apparatus is FCL, specifically comprise series circuit branch road, capacitor group branch road, the poor branch road of capacitor bridge, MOV branch road, GAP branch road, thyristor bypass branch and BCB branch road, at least one in GAP and thyristor bypass branch wherein can be set as required.In Fig. 2-embodiment illustrated in fig. 4, install respectively two TA on all branches in the series capacitance apparatus except the BCB branch road.Like this, all can measure current signal on the capacitor group branch road in the series capacitance apparatus, the poor branch road of capacitor bridge, MOV branch road, GAP branch road.Fig. 2, Fig. 3 and capacitor group shown in Figure 4 can require to adopt the wiring of H type, double H-type wiring or other mode of connection according to capacity, anti-quick-fried, overvoltage multiple etc.
Below make a concrete analysis of the relation between current signal in each branch road of series capacitance apparatus.The tie point that each branch road of series capacitance apparatus and series circuit branch road are common, be called with reference to node, and the branch road related with the reference node is called total node branch road.For example in the present invention shown in Figure 2 in the structural representation of an embodiment of series capacitance apparatus, the common tie point A of each branch road of FSC and series circuit branch road 1 is with reference to node, the branch road related with reference node A has capacitor group branch road, MOV branch road, GAP branch road, BCB branch road, is one group of total node branch road.Due in the series capacitance apparatus of Fig. 2-shown in Figure 4, current transformer is not set on the BCB branch road, and the BCB branch road is in off-state, according to Kirchhoff's current law (KCL) as can be known, flows into this electric current with reference to node and equals to flow out this electric current with reference to node.Getting each total node branch road, to flow into this direction with reference to node be positive direction, supposes to comprise that the series circuit branch road has n bar branch road.The real primary current value of each branch road becomes the secondary electric flow valuve, through electromagnetic interference (ELECTROMAGNETIC INTERFERENCE, be called for short: EMI) filtering, signal condition, the instantaneous sampling data that obtain by steps such as digital-to-analogue conversion, opto-electronic conversion again, compare and have certain error with actual value Direct Sampling data.Therefore, when the BCB branch road is in the state of disconnection, for each branch road in each total node branch road, at current sampling signal that two current transformers of redundancy are each other surveyed all in believable situation, the absolute value of all the other the branch current algebraical sums except the BCB branch road is less than or equal to definite value δ, namely
And
I wherein
T.iAnd i '
T.iFor the current signal that the first current transformer on i branch road in n total node branch road and the second current transformer are measured at sampling instant T respectively, subscript T represents sampling instant, and subscript i represents i bar branch road, δ〉0 and be approximately zero.δ is under the believable prerequisite of current signal, the series capacitance apparatus under different operating conditions the maximum absolute error value of getable sample rate current signal algebraical sum absolute value, can and with reference to empirical value, obtain by a large amount of test recorder datas or on-the-spot service data.
Due to one group of current signal (i that can utilize Kirchhoff's current law (KCL) to each sampling instant
T.1～i
T.n) and (i '
T.1～i '
T.n) carry out computing and make corresponding judgement, therefore as the current signal i that determines that the first current transformer that arranges on n i branch road in total node branch road and the second current transformer are measured at sampling instant T respectively
T.iAnd i '
T.iIn have one when insincere, can judge by above-mentioned Kirchhoff's current law (KCL), to identify believable current signal.
Fig. 5 is the flow chart of another embodiment of control guard method of series capacitance apparatus of the present invention.As shown in Figure 5, the control guard method of this embodiment series capacitance apparatus is as follows:
Step 203; according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement; perhaps; according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on each branch road.Afterwards, no longer carry out the follow-up flow process of the present embodiment.
Step 204, respectively in difference not on the branch road of each in preset range, whether detect that the difference between the current signal measured of the current signal measured of the first current transformer and the second current transformer is not in preset range constantly M continuous sampling, M is the integer of presetting greater than zero; If the difference between the current signal that the first current transformer that arranges on each branch road of sampling instant continuous less than M and the second current transformer are measured respectively is not in preset range, expression continuous sampling numerical value accumulative total is constantly added 1, the current signal that execution step 201 is measured in next sampling instant respectively to receive respectively the first current transformer of arranging on each branch road and the second current transformer; If the difference between the current signal on M each branch road of the continuous sampling moment not in preset range, performs step 205.
Step 208, utilize the set of the current signal that the second current transformer of arranging on each branch road measures in same sampling instant, and the series capacitance apparatus is carried out current protection.Afterwards, no longer carry out the follow-up flow process of the present embodiment.
In step 207 and 208; although the difference between two current signals measured on certain or certain several branch roads of total node branch road is not in preset range; but by Kirchhoff's current law (KCL), can identify believable current signal; thereby need not the current protection of locking associated branch, improved the availability factor of protection system.
In this specific embodiment, before the current transformer that arranges on each total node branch road is measured current signal, the BCB branch road that current transformer is not set is set to off-state, and this can make and obtain result accurately when using Kirchhoff's current law (KCL) to calculate.
in this specific embodiment, whether the current signal sum of measuring in same sampling instant due to the current transformer that utilizes Kirchhoff's current law (KCL) to judge to arrange on each total node branch road is credible, therefore the present invention can identify believable current signal from the redundant current signal that each total node branch road is measured, in the reliability of assurance for the current signal of current protection, also reduced the operation of locking associated branch current protection, effectively avoided causing unnecessary the withdrawing from of whole protective device because of the false phenomenon of the failure of the insincere manufacturing of current signal of measuring, thereby effectively improved the availability factor of protection system.
In this specific embodiment, because the poor branch current of capacitor bridge does not flow directly into or flows out this with reference to node, therefore can only judge whether current signal is credible by the size of two current signals on the poor branch road of contrast capacitor bridge, be credible signal and can not utilize above-mentioned Kirchhoff's current law (KCL) specifically to identify which current signal on this branch road.Therefore, in case while finding that there is incredible situation in current signal on the poor branch road of capacitor bridge, the current protection of the poor branch road of blocking capacitor bridge immediately, in order to avoid carry out misoperation to the series capacitance apparatus.
In specific embodiments of the invention, in the incredible situation of current signal, do not adopt after M continuous sampling instant of judgement all do not meet the demands and make again the incredible decision of current signal., by the mode of this continuous judgement, can effectively avoid current signal accidentally not meet logic criterion and the erroneous judgement that causes in indivedual sampling instants, thereby guarantee the reliability of judgement.
Below be provided with the relation between the first current transformer of redundancy each other and current signal that the second current transformer is measured respectively in concrete analysis series capacitance apparatus.Suppose that two current signal measured values on i bar branch road are respectively i
T.iAnd i '
T.i.At current sampling signal that two current transformers are surveyed all in believable situation, i
T.iAnd i '
T.iApproximately equal, therefore can pass through i
T.iAnd i '
T.iContrast judge whether to exist the current signal distortion.When the digital quantity of surveying hour, can utilize inequality one | i
T.i-i '
T.i|≤ε judges, wherein ε〉0 and close to zero, the error range value of can the reference current instrument transformer measuring is determined; When the digital quantity of surveying is larger, utilize inequality two
Judge, wherein ξ 0, close to zero, the error range value of can the reference current instrument transformer measuring is determined.After preventing erroneous judgement, can take current sampling data neither to meet inequality one not meet inequality two again, then determine that these two signals are insincere.
According to another specific embodiment of the present invention; in each embodiment of the control guard method of the above-mentioned series capacitance apparatus of the present invention; can respectively on each branch road, detect the first current transformer and the second current transformer and whether meet criterion at the current signal that same sampling instant is measured respectively | i
T.i-i '
T.i|≤ε with
Current signal i wherein
T.iAnd i '
T.iBe respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein subscript T represents sampling instant, and subscript i represents i branch road, ε and ξ for default greater than zero numerical value; If respectively on each branch road, the first current transformer and the second current transformer all meet criterion at the current signal that same sampling instant is measured respectively, determine respectively on each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is all in preset range; If respectively on each branch road, the first current transformer and the second current transformer not all meet criterion at the current signal that same sampling instant is measured respectively, determine respectively on each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is not all in preset range.
In another specific embodiment of the present invention; in each embodiment of the control guard method of the above-mentioned series capacitance apparatus of the present invention; can judge the current signal sum of the first current transformer measurement that arranges on each total node branch road; and the current signal sum of the second current transformer measurement, whether meet respectively first condition
And second condition
Current signal i wherein
T.iAnd i '
T.iIt is respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein n is the number of each total node branch road, subscript T represents sampling instant, and subscript i represents i branch road, and δ is for presetting the numerical value greater than zero; , if the current signal sum that the first current transformer that arranges on each total node branch road is measured meets first condition, determine that the current signal that the first current transformer that arranges on each total node branch road is measured meets Kirchhoff's current law (KCL); , if the current signal sum that the second current transformer that arranges on each total node branch road is measured meets second condition, determine that the current signal that the second current transformer that arranges on each total node branch road is measured meets Kirchhoff's current law (KCL); If the current signal sum that the first current transformer that arranges on each total node branch road is measured does not meet first condition, and the current signal sum that the second current transformer that arranges on each total node branch road is measured does not meet second condition, determine the current signal sum that the first current transformer that arranges on each total node branch road is measured in same sampling instant, current signal sum with the second current transformer is measured in same sampling instant, all do not meet Kirchhoff's current law (KCL).
Fig. 6 is the flow chart of another embodiment of control guard method of series capacitance apparatus of the present invention., in order further to improve the reliability and security of the control guard method of series capacitance apparatus, can adopt redundancy each other, two protective devices that function is identical to carry out respectively the control guard method of series capacitance apparatus of the present invention.Wherein each protective device is received in the current signal that the first current transformer of arranging on each branch road and the second current transformer are measured in same sampling instant respectively independently of one another, and carries out independently of one another the operation of latching current protection.Two each other the protective device of redundancy can carry out respectively each specific embodiment of the control guard method of the above-mentioned series capacitance apparatus of the present invention.In the embodiment shown in fig. 6, two protective devices can be carried out the following step 301-304 independently of one another:
Fig. 7 is the structural representation of an embodiment of control protective unit of series capacitance apparatus of the present invention.The control protective unit of this embodiment can be used in the present invention the corresponding function of the control guard method of above-mentioned series capacitance apparatus.wherein in this embodiment, the series capacitance apparatus comprises a plurality of branch roads, wherein a plurality of branch roads comprise the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road in a plurality of branch roads except the bypass breaker branch road and be in off-state, this control protective unit comprises receiving element 701, the first detecting unit 702 and performance element 703, wherein:
Receiving element 701, be used for the current signal that reception the first current transformer and the second current transformer are measured in same sampling instant respectively;
The first detecting unit 702, be used for respectively at each branch road, detects difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range;
the control protective unit of the series capacitance apparatus that provides based on the above embodiment of the present invention, by being respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in a plurality of branch roads the series capacitance apparatus comprises, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road in a plurality of branch roads except the bypass breaker branch road and be in off-state, the current signal of measuring in same sampling instant respectively by receiving above-mentioned the first current transformer and the second current transformer, and respectively on each branch road, detect difference between the current signal that current signal that the first current transformer measures and the second current transformer measure whether all in preset range.If the difference between the current signal on above-mentioned each branch road is in preset range; according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement; perhaps; according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road.If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.Thereby can guarantee the reliability for the current signal of current protection; and can be when the difference between the branch current signal be not insincere in preset range the current protection of locking respective branch; thereby can prevent malfunction or the tripping of current protection, improve the reliability and security of series capacitor unit protection.
According to a specific embodiment of the present invention, the series capacitance apparatus can be FSC, TCSC, FCL, or other similar device.As shown in Figure 2, Figure 3, Figure 4, be the possible series capacitance apparatus embodiment of the present invention.Wherein the series capacitance apparatus is FSC in Fig. 2; The series capacitance apparatus is TCSC in Fig. 3, wherein as required the GAP branch road can be arranged, and also can there is no the GAP branch road; The series capacitance apparatus is FCL in Fig. 4, and at least one in GAP and thyristor bypass branch wherein can be set as required.
Fig. 8 is the structural representation of another embodiment of control protective unit of series capacitance apparatus of the present invention.The control protective unit of this embodiment can be used in the present invention the function of the control guard method of above-mentioned middle series capacitance apparatus embodiment illustrated in fig. 5.Referring to Fig. 8, compare with embodiment shown in Figure 7, except above-mentioned receiving element 701, the first detecting unit 702 and performance element 703, the control protective unit of this embodiment also comprises recognition unit 801, judging unit 802, wherein:
Judging unit 802, be used for the recognition result according to recognition unit 801, if the difference between the current signal not branch road in preset range comprises the poor branch road of capacitor bridge and also comprises total node branch road, the current signal sum that judgement arranges on each total node branch road the first current transformer is measured in same sampling instant, and whether the second current transformer that arranges on each total node branch road meets respectively Kirchhoff's current law (KCL) in the current signal sum of same sampling instant measurement; If the current signal sum that the first current transformer that arranges on each total node branch road is measured in same sampling instant; with the current signal sum of the second current transformer in same sampling instant measurement; all do not meet Kirchhoff's current law (KCL), the difference between indication performance element 703 latching current signals is the current protection of the branch road in preset range not.
In another specific embodiment of the present invention; performance element 703 specifically can also be according to the judged result of judging unit 802; if the current signal sum that the first current transformer that arranges on each total node branch road is measured in same sampling instant; perhaps the second current transformer is in the current signal sum of same sampling instant measurement; meet Kirchhoff's current law (KCL), the current protection of the poor branch road of blocking capacitor bridge.
In another specific embodiment of the present invention, judging unit 802 is also according to the recognition result of recognition unit 801, if the difference between the current signal not branch road in preset range comprises total node branch road and does not comprise the poor branch road of capacitor bridge, the current signal sum that judgement arranges on each total node branch road the first current transformer is measured in same sampling instant, and whether the second current transformer that arranges on each total node branch road meets respectively Kirchhoff's current law (KCL) in the current signal sum of same sampling instant measurement; If the current signal sum that the first current transformer that arranges on each total node branch road is measured in same sampling instant; with the current signal sum of the second current transformer in same sampling instant measurement; all do not meet Kirchhoff's current law (KCL), the difference between indication performance element 703 latching current signals is the current protection of the branch road in preset range not.
In another specific embodiment of the present invention, performance element 703 is also specifically according to the judged result of judging unit 802, if the current signal sum that the first current transformer that arranges on each total node branch road is measured in same sampling instant meets Kirchhoff's current law (KCL), utilize the set of the current signal that the first current transformer of arranging on each branch road measures in same sampling instant, the series capacitance apparatus is carried out current protection; If the current signal sum that the second current transformer that arranges on each total node branch road is measured in same sampling instant meets Kirchhoff's current law (KCL); utilize the set of the current signal that the second current transformer of arranging on each branch road measures in same sampling instant, the series capacitance apparatus is carried out current protection.
In this specific embodiment; although the difference between two current signals measured on certain or certain several branch roads of total node branch road is not in preset range; but by Kirchhoff's current law (KCL), still can identify believable current signal; thereby need not the current protection of locking associated branch, improved the availability factor of protection system.
In another specific embodiment of the present invention; performance element 703 is also specifically according to the recognition result of recognition unit 801; if the difference between the current signal not branch road in preset range comprises the poor branch road of capacitor bridge and does not comprise total node branch road, the current protection of the poor branch road of blocking capacitor bridge.
in above-mentioned specific embodiment, whether the current signal sum of measuring in same sampling instant due to the current transformer that utilizes Kirchhoff's current law (KCL) to judge to arrange on each total node branch road is credible, therefore the present invention can identify believable current signal from the redundant current signal that each total node branch road is measured, in the reliability of assurance for the current signal of current protection, also reduced the operation of locking associated branch current protection, effectively avoided causing unnecessary the withdrawing from of whole protective device because of the false phenomenon of the failure of the insincere manufacturing of current signal of measuring, thereby effectively improved the availability factor of protection system.
In above-mentioned specific embodiment, because the poor branch current of capacitor bridge does not flow directly into or flows out this with reference to node, therefore in this specific embodiment, can only judge whether current signal is credible by the size of two current signals on the poor branch road of contrast capacitor bridge, be credible signal and can not specifically identify which current signal on this branch road.Therefore, in case while finding that there is incredible situation in current signal on the poor branch road of capacitor bridge, the current protection of the poor branch road of blocking capacitor bridge immediately, in order to avoid carry out misoperation to the series capacitance apparatus.
Fig. 9 is the structural representation of another embodiment of control protective unit of series capacitance apparatus of the present invention.The control protective unit of this embodiment also can be used in the present invention the function of the control guard method of above-mentioned middle series capacitance apparatus embodiment illustrated in fig. 5.Referring to Fig. 9, to compare with embodiment shown in Figure 8, the control protective unit of this embodiment except above-mentioned receiving element 701, the first detecting unit 702, performance element 703, recognition unit 801, the second judging unit 802, also comprises the second detecting unit 901.Wherein the second detecting unit 901 is for the testing result according to the first detecting unit 702, respectively in difference not on the branch road of each in preset range, whether detect that the difference between the current signal measured of the current signal measured of the first current transformer and the second current transformer is not in preset range constantly M continuous sampling, M is the integer of presetting greater than zero; If the difference between the current signal that the first current transformer that arranges on each branch road of sampling instant continuous less than M and the second current transformer are measured respectively is not in preset range, expression continuous sampling numerical value accumulative total is constantly added 1, the current signal that indication receiving element 701 is measured in next sampling instant respectively to receive respectively the first current transformer of arranging on each branch road and the second current transformer; If the difference between the current signal on M each branch road of the continuous sampling moment is not in preset range, whether the difference between the indication recognition unit 801 identification current signals not branch road in preset range comprises the poor branch road of capacitor bridge and/or total node branch road.
In this specific embodiment, in the incredible situation of current signal, do not adopt after M continuous sampling instant of judgement all do not meet the demands and make again the incredible decision of current signal., by the mode of this continuous judgement, can effectively avoid current signal accidentally not meet logic criterion and the erroneous judgement that causes in indivedual sampling instants, thereby guarantee the reliability of judgement.
According to another specific embodiment of the present invention, in the control protective unit embodiment of the above-mentioned series capacitance apparatus of the present invention, when the digital quantity of surveying hour, the first detecting unit 702 can utilize inequality one | i
T.i-i '
T.i|≤ε judges, wherein ε〉0 and close to zero, the error range value of can the reference current instrument transformer measuring is determined; When the digital quantity of surveying was larger, the first detecting unit 702 utilized inequality two
Judge, wherein ξ 0, close to zero, the error range value of can the reference current instrument transformer measuring is determined., in order to prevent erroneous judgement, after the first detecting unit 702 can be taked current sampling data neither to meet inequality one not meet inequality two again, then determine that these two signals are insincere.Current signal i wherein
T.iAnd i '
T.iBe respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein subscript T represents sampling instant, and subscript i represents i branch road, ε and ξ for default greater than zero numerical value; If respectively on each branch road, the first current transformer and the second current transformer all meet criterion at the current signal that same sampling instant is measured respectively, determine respectively on each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is all in preset range; If respectively on each branch road, the first current transformer and the second current transformer not all meet criterion at the current signal that same sampling instant is measured respectively, determine respectively on each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is not all in preset range.
According to another specific embodiment of the present invention; in the control protective unit embodiment of the above-mentioned series capacitance apparatus of the present invention; the current signal sum that the first current transformer that arranges on concrete each the total node branch road of judgement of judging unit 802 is measured; and the current signal sum of the second current transformer measurement, whether meet respectively first condition
And second condition
Current signal i wherein
T.iAnd i '
T.iIt is respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein n is the number of each total node branch road, subscript T represents sampling instant, and subscript i represents i branch road, and δ is for presetting the numerical value greater than zero; , if the current signal sum that the first current transformer that arranges on each total node branch road is measured meets first condition, determine that the current signal that the first current transformer that arranges on each total node branch road is measured meets Kirchhoff's current law (KCL); , if the current signal sum that the second current transformer that arranges on each total node branch road is measured meets second condition, determine that the current signal that the second current transformer that arranges on each total node branch road is measured meets Kirchhoff's current law (KCL); If the current signal sum that the first current transformer that arranges on each total node branch road is measured does not meet first condition, and the current signal sum that the second current transformer that arranges on each total node branch road is measured does not meet second condition, determine the current signal sum that the first current transformer that arranges on each total node branch road is measured in same sampling instant, current signal sum with the second current transformer is measured in same sampling instant, all do not meet Kirchhoff's current law (KCL).
Figure 10 is the structural representation of an embodiment of control protection system of series capacitance apparatus of the present invention.The control protection system of this embodiment series capacitance apparatus can be used in the present invention the flow process of the control guard method of above-mentioned series capacitance apparatus.As shown in figure 10, control protection system and comprise platform data acquisition system 1001 and the first protective device 1002.The series capacitance apparatus comprises a plurality of branch roads simultaneously, wherein a plurality of branch roads comprise the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road except the bypass breaker branch road in a plurality of branch roads and be in off-state.Wherein:
Platform data acquisition system 1001, be used for to receive the current signal that the first current transformer of installing on each branch road in a plurality of branch roads of series capacitance apparatus and the second current transformer measure in same sampling instant respectively and process.Platform data acquisition system 1001 utilizes the equipment such as electromagnetic interface filter, signal condition unit and A/D converting unit the current signal that receives to be carried out the processing such as filtering, A/D conversion, and the current signal after processing by corresponding light path is sent to first protective device 1002 in control room on the spot.
The first protective device 1002, be used for the current signal that receiving platform data acquisition system 1001 sends; Respectively on each branch road, detect difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range; If the difference between the current signal on each branch road is in preset range, according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on each branch road; If the difference between the current signal on each branch road is not all in preset range, the difference between the latching current signal is the current protection of the branch road in preset range not.
the control protection system of the series capacitance apparatus that provides based on the above embodiment of the present invention, by being respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in a plurality of branch roads the series capacitance apparatus comprises, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and bypass breaker branch road on each branch road in a plurality of branch roads except the bypass breaker branch road and be in off-state, the current signal of measuring in same sampling instant respectively by receiving above-mentioned the first current transformer and the second current transformer, and respectively on each branch road, detect difference between the current signal that current signal that the first current transformer measures and the second current transformer measure whether all in preset range.If the difference between the current signal on above-mentioned each branch road is in preset range; according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement; perhaps; according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road.If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.Thereby can guarantee the reliability for the current signal of current protection; and can be when the difference between the branch current signal be not insincere in preset range the current protection of locking respective branch; thereby can prevent malfunction or the tripping of current protection, improve the reliability and security of series capacitor unit protection.
According to a specific embodiment of the present invention, the series capacitance apparatus can be FSC, TCSC, FCL, or other similar device.As shown in Figure 2, Figure 3, Figure 4, be the possible series capacitance apparatus embodiment of the present invention.Wherein the series capacitance apparatus is FSC in Fig. 2; The series capacitance apparatus is TCSC in Fig. 3, wherein as required the GAP branch road can be arranged, and also can there is no the GAP branch road; The series capacitance apparatus is FCL in Fig. 4, and at least one in GAP and thyristor bypass branch wherein can be set as required.
Figure 11 is the structural representation of another embodiment of control protection system of series capacitance apparatus of the present invention.In this embodiment, control protection system and comprise platform data acquisition system 1001, the first protective device 1002 and operating means 1003, wherein:
At first current signal is delivered to data summarization unit 1011 in the first protective device 1002 with the light signal form through light path; data summarization unit 1011 first converts light signal to the signal of telecommunication; and therefrom parse sampled data, then sampled data is sent to each control unit 1012 and protected location 1013 by the data format of making an appointment.
In practical engineering application, light path and platform data acquisition system 1001 can be directly exposed to open air, and data summarization unit 1011 can be in the protection cabinet be controlled on ground.Because data summarization unit 1011 is data source header that protection system is controlled on ground; its service behaviour has determined the operation conditions of a whole set of control protection system to a great extent; therefore require data summarization unit 1011 to have high speed, stable data-handling capacity, error detection to a certain degree and error correction, stronger noiseproof feature, and can provide abundant state information for self operating mode.
The current signal that the first protective device 1002 provides according to platform data acquisition system 1001, detecting difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether in preset range respectively on each branch road; If the difference between the current signal on each branch road is in preset range, according to the set of the first current transformer that arranges on each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on each branch road; If the difference between the current signal on each branch road is not all in preset range, by the current protection of the branch road in preset range not of the difference between control unit 1012 latching current signals.
Operating means 1003, according to the control of the protected location 1013 in the first protective device 1002, carries out the operations such as circuit breaker, disconnecting link to the series capacitance apparatus.
According to a specific embodiment of the present invention, data summarization unit 1011 or the interior execution of protected location 1013 that the relevant identifying operation that relates in the first protective device 1002 and definite operation can be in the first protective devices 1002.If aforesaid operations is in the interior execution of data summarization unit 1011, this computing should be last the logical operation link before current signal is sent to protected location 1013., if the computing of relevant criterion is in the interior execution of protected location 1013, should be first logical operation link after current signal is sent to protected location 1013.
In the control protection system of the series capacitance apparatus of various embodiments of the present invention, each specific embodiment of the control protective unit that the first protective device 1002 specifically can be by the above-mentioned series capacitance apparatus of the present invention is realized.For example in this embodiment, the first concrete the present invention embodiment shown in Figure 7 that adopts of protective device 1002.
Figure 12 is the structural representation of another embodiment of control protection system of series capacitance apparatus of the present invention., in order further to improve the reliability of the control guard method of series capacitance apparatus, can adopt redundancy each other, two protective devices that function is identical to carry out respectively the control guard method of series capacitance apparatus of the present invention.Wherein two protective devices 1002 and 1022 receive the current signal that the first current transformer and the second current transformer are measured in same sampling instant respectively independently of one another, and carry out independently of one another the operation of latching current protection.Each specific embodiment of two control protective units that the protective device 1002 and 1022 of redundancy specifically can be by the above-mentioned series capacitance apparatus of the present invention is each other realized.Embodiment illustrated in fig. 12ly as an example of series capacitance apparatus embodiment illustrated in fig. 13 example, describe.
Referring to Figure 12; compare with embodiment shown in Figure 11; this embodiment is except platform data acquisition system 1001, the first protective device 1002 and operating means 1003; also have respectively platform data acquisition system 1021 and the second protective device 1022 with platform data acquisition system 1001 and the first protective device 1002 mutual redundancies, the functions of the equipments of redundancy are identical mutually.The secondary side of measuring TA has two passages, and measurement data is passed through respectively these two channel transfer to platform data acquisition system 1001 and 1021.Platform data acquisition system 1001 and 1021 sends to the first protective device 1002 and the second protective device 1022 with the current signal after the processing such as filtering, A/D conversion respectively.The first protective device 1002 and the second protective device 1022 be receiving platform data acquisition system 1001 and 1021 current signals that send respectively, and carry out independently of one another the operation of latching current protection.
Take the series capacitance apparatus, being below FSC illustrates this embodiment of the invention as example.
Figure 13 is the structural representation when the series capacitance apparatus is FSC according to the present invention.Include current transformer TA1～TA7 and the TA1'～TA7' that installs on series capacitor bank, two metal oxide pressure-limiting device MOV1 and MOV2, damping device D, spark gap GAP, bypass breaker BCB and each key equipment place branch road and series circuit branch road at this FSC, the connection capacitor adopts single H type mode of connection.In this embodiment,, owing to being provided with two current transformers of redundancy each other on the BCB branch road, therefore need not to consider the state of BCB branch road when processing.
In Figure 13, getting node A is that the numbering of each branch road is identical with the numbering of each branch current instrument transformer with reference to node, and getting the direction that flows into node A is positive direction.The sampled signal of series circuit branch current, capacitor bank branch current, MOV1 branch current, MOV2 branch current, GAP branch current, BCB branch current, the poor branch current of capacitor bridge is followed successively by i
T.1, i
T.2, i
T.3, i
T.4, i
T.5, i
T.6, i
T.7.Two cover acquisition systems respectively should corresponding two cover sampled signal, i.e. i
T.A1～i
T.A7And i
T.B1～i
T.B7.
The present embodiment is determined the whether believable function interior realization of data summarization unit 1011 in the first protective device 1002 and the second protective device 1022 respectively of current signal.Also realize in the protected location 1013 in the first protective device 1002 and the second protective device 1022 respectively.
The present embodiment first press logic criterion (| i
T.i-i '
T.i|≤ε) with
Computing also judges whether two signals of every branch road are credible, and the error range value that ε and ξ can the reference current instrument transformer measure is determined.Cause erroneous judgement for avoiding current signal indivedual moment point under trustworthy information accidentally not meet this criterion, the present embodiment is got the M=5 time delay.
Calculate in the first protective device 1002 | i
T.A1-i '
T.A1| ... | i
T.A7-i '
T.A7| and
And judge whether respectively less than ε and ξ; Calculate in the second protective device 1022 | i
T.B1-i '
T.B1| ... | i
T.B6-i '
T.B6| and
And judge whether respectively less than ε and ξ.Wherein:
1) if in two protective devices, 7 branch road measurement signal value in the series capacitance apparatus all meet corresponding criterion, think that the current signal of two protective devices receptions is all credible.Can choose one group of believable current signal wantonly, be i this moment
T.A1～i
T.A7Perhaps i
T.B1～i
T.B7, the series capacitance apparatus is carried out current protection.
2) if therein in protective device, continuous 5 sampled points of two current signals of the t bar branch road in judgement series capacitance apparatus do not meet inequality | i
T.t-i '
T.t|≤ε and
Think this t bar branch current signal i
T.tAnd i '
T.tBetween must have a signal insincere; should enter and utilize Kirchhoff's current law (KCL) to identify the judgement link of credible signal; and in time according to the incredible reason of recorder data investigation current signal; if certain component wear in this measuring system and causing; can withdraw from this cover measuring system and control and protection system and change and damage element, and another protective device normally moves.
For example, make i
KCLAlgebraical sum for corresponding all the branch current sampled values of node A.Calculate i in the data summarization unit of protective device
KCL.A=i
T.A1+ ...+i
T.A6, i '
KCL.A=i '
T.A1+ ...+i '
T.A6If, | i
KCL.A|≤δ meets, and shows i
T.tBelievable, can be according to i
T.1～i
T.7The series capacitance apparatus is carried out current protection; If | i '
KCL.A|≤δ meets, and shows i '
T.tBelievable, can be according to i '
T.1～i '
T.7The series capacitance apparatus is carried out current protection.
In this kind situation; although the difference between two current signals measured on certain or certain several branch roads of total node branch road is not in preset range; but by Kirchhoff's current law (KCL), still can identify believable current signal; thereby need not the current protection of locking associated branch, improved the availability factor of protection system.
It may be noted that, the incredible situation of electric current appears if judge not flowing directly into or flow out on the associated branch of node A, for example incredible situation appears in the current signal on the poor branch road of capacitor bridge in the present embodiment, can not use Kirchhoff's current law (KCL) to identify credible signal.Therefore, in case while finding that there is incredible situation in current signal on this branch road, the current protection of the poor branch road of blocking capacitor bridge immediately, in order to avoid carry out misoperation to the series capacitance apparatus.
The present invention utilizes the difference between the current signal that two current transformers of redundancy each other measure respectively, can identify believable current signal on each branch road of series capacitance apparatus, thereby guarantee to be used for the reliability of the current signal of current protection.Utilize simultaneously the judgement of the Kirchhoff's current law (KCL) that uses on total node branch road, reduced the operation of locking associated branch current protection, improved the availability factor of protection system.
The principle of the invention is simply distinct, and the data amount of calculation of bringing is very little, can not affect data processing speed.The present invention simultaneously is convenient to software and is realized, and is economical and practical, can be applied to various protection occasions.
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 present invention's design to be suitable for the various embodiment with various modifications of special-purpose.
Claims (27)
1. the control guard method of a series capacitance apparatus, it is characterized in that, described series capacitance apparatus comprises a plurality of branch roads, wherein said a plurality of branch road comprises the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in described a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and described bypass breaker branch road on each branch road in described a plurality of branch roads except the bypass breaker branch road and be in off-state, the method comprises:
Receive the current signal that described the first current transformer and the second current transformer are measured in same sampling instant respectively;
Respectively on described each branch road, detect difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range;
If the difference between the described current signal on described each branch road is in preset range, according to the set of the first current transformer that arranges on described each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road;
If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.
2. method according to claim 1, is characterized in that,
If the difference between the described current signal on described each branch road not all in preset range, also comprises:
Identify between described current signal difference not the branch road in preset range whether comprise the poor branch road of capacitor bridge and/or total node branch road;
If the difference between the described current signal not branch road in preset range comprises the poor branch road of capacitor bridge and also comprises total node branch road, the current signal sum that judgement arranges on each total node branch road the first current transformer is measured in same sampling instant, and whether the second current transformer that arranges on each total node branch road meets respectively Kirchhoff's current law (KCL) in the current signal sum of same sampling instant measurement;
If the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant; with the current signal sum of the second current transformer in same sampling instant measurement; all do not meet Kirchhoff's current law (KCL), the difference between the described current signal of locking is the current protection of the branch road in preset range not.
3. method according to claim 2; it is characterized in that; if the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant; perhaps the second current transformer is in the current signal sum of same sampling instant measurement; meet Kirchhoff's current law (KCL), the current protection of the poor branch road of the described capacitor bridge of locking.
4. method according to claim 2, is characterized in that,
If the difference between the described current signal not branch road in preset range comprises total node branch road and does not comprise the poor branch road of capacitor bridge, the current signal sum that judgement arranges on each total node branch road the first current transformer is measured in same sampling instant, and whether the second current transformer that arranges on each total node branch road meets respectively Kirchhoff's current law (KCL) in the current signal sum of same sampling instant measurement;
If the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant; with the current signal sum of the second current transformer in same sampling instant measurement; all do not meet Kirchhoff's current law (KCL), the difference between the described current signal of locking is the current protection of the branch road in preset range not.
5. method according to claim 4, is characterized in that,
If the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant meets Kirchhoff's current law (KCL), utilize the set of the current signal that the first current transformer of arranging on described each branch road measures in same sampling instant, the series capacitance apparatus is carried out current protection;
If the current signal sum that the second current transformer that arranges on described each total node branch road is measured in same sampling instant meets Kirchhoff's current law (KCL); utilize the set of the current signal that the second current transformer of arranging on described each branch road measures in same sampling instant, the series capacitance apparatus is carried out current protection.
6. method according to claim 2, is characterized in that,
If the difference between the described current signal not branch road in preset range comprises the poor branch road of capacitor bridge and does not comprise total node branch road, the current protection of the poor branch road of blocking capacitor bridge.
7. the described method of any one according to claim 1-6, it is characterized in that, whether described difference between the current signal of the current signal that detects the first current transformer measurement on described each branch road and the measurement of the second current transformer respectively comprises in preset range:
On described each branch road, detect the first current transformer and the second current transformer and whether meet criterion at the current signal that same sampling instant is measured respectively respectively | i
T.i-i '
T.i|≤ε with
Current signal i wherein
T.iAnd i '
T.iBe respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein subscript T represents sampling instant, and subscript i represents i branch road, ε and ξ for default greater than zero numerical value;
If respectively on described each branch road, the first current transformer and the second current transformer all meet described criterion at the current signal that same sampling instant is measured respectively, determine respectively on described each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is all in preset range;
If respectively on described each branch road, the first current transformer and the second current transformer not all meet described criterion at the current signal that same sampling instant is measured respectively, determine respectively on described each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is not all in preset range.
8. the described method of any one according to claim 1-6, is characterized in that, if the difference between the described current signal on described each branch road not all in preset range, also comprises:
Respectively in difference not on the branch road of each in preset range, whether detect that the difference between the current signal measured of the current signal measured of the first current transformer and the second current transformer is not in preset range constantly M continuous sampling, M is the integer of presetting greater than zero;
If M continuous sampling constantly the difference between the described current signal on described each branch road not in preset range, identify between described current signal difference not the branch road in preset range whether comprise the poor branch road of capacitor bridge and/or total node branch road.
9. the described method of any one according to claim 2-6, it is characterized in that, whether the current signal sum that the current signal sum that described judgement is measured in same sampling instant at the first current transformer that arranges on each total node branch road and the second current transformer that arranges on each total node branch road are measured in same sampling instant meets respectively Kirchhoff's current law (KCL) comprises:
Judge the current signal sum of the first current transformer measurement that arranges on described each total node branch road, and the current signal sum of the second current transformer measurement, whether meet respectively first condition
And second condition
Current signal i wherein
T.iAnd i '
T.iIt is respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein n is the number of described each total node branch road, subscript T represents sampling instant, and subscript i represents i branch road, and δ is for presetting the numerical value greater than zero;
, if the current signal sum that the first current transformer that arranges on described each total node branch road is measured meets first condition, determine that the current signal that the first current transformer that arranges on described each total node branch road is measured meets Kirchhoff's current law (KCL);
, if the current signal sum that the second current transformer that arranges on described each total node branch road is measured meets second condition, determine that the current signal that the second current transformer that arranges on described each total node branch road is measured meets Kirchhoff's current law (KCL);
If the current signal sum that the first current transformer that arranges on described each total node branch road is measured does not meet first condition, and the current signal sum that the second current transformer that arranges on described each total node branch road is measured does not meet second condition, determine the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant, current signal sum with the second current transformer that arranges on described each total node branch road is measured in same sampling instant, all do not meet Kirchhoff's current law (KCL).
10. the described method of any one according to claim 1-6; it is characterized in that; carry out respectively each other by redundancy, protective device that function is identical by two for described method; wherein each protective device is received in the current signal that the first current transformer of arranging on described each branch road and the second current transformer are measured in same sampling instant respectively independently of one another, and carries out independently of one another the operation of latching current protection.
11. according to claim 1-6, the described method of any one, is characterized in that, the series capacitance apparatus is fixed series capacitors compensation arrangement, thyristor controlled series capacitor compensation arrangement or series resonant-type fault current limiter device.
12. the control protective unit of a series capacitance apparatus, it is characterized in that, described series capacitance apparatus comprises a plurality of branch roads, wherein said a plurality of branch road comprises the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in described a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and described bypass breaker branch road on each branch road in described a plurality of branch roads except the bypass breaker branch road and be in off-state, this control protective unit comprises receiving element, the first detecting unit and performance element, wherein:
Receiving element, be used for receiving the current signal that described the first current transformer and the second current transformer are measured in same sampling instant respectively;
The first detecting unit, be used for respectively at described each branch road, detects difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range;
Performance element, be used for the judged result according to described the first detecting unit, if the difference between the described current signal on described each branch road is in preset range, according to the set of the first current transformer that arranges on described each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road; If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.
13. control protective unit according to claim 12, is characterized in that, control protective unit also comprises recognition unit and judging unit, wherein:
Recognition unit, be used for the judged result according to described the first detecting unit, if the difference between the described current signal on described each branch road not all in preset range, identify between described current signal difference not the branch road in preset range whether comprise the poor branch road of capacitor bridge and/or total node branch road;
Judging unit, be used for the recognition result according to described recognition unit, if the difference between the described current signal not branch road in preset range comprises the poor branch road of capacitor bridge and also comprises total node branch road, the current signal sum that judgement arranges on each total node branch road the first current transformer is measured in same sampling instant, and whether the second current transformer that arranges on each total node branch road meets respectively Kirchhoff's current law (KCL) in the current signal sum of same sampling instant measurement; If the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant; with the current signal sum of the second current transformer in same sampling instant measurement; all do not meet Kirchhoff's current law (KCL), indicate the difference current protection of the branch road in preset range not between the described current signal of described performance element locking.
14. control protective unit according to claim 13; it is characterized in that; described performance element is also according to the recognition result of described judging unit; if the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant; perhaps the second current transformer is in the current signal sum of same sampling instant measurement; meet Kirchhoff's current law (KCL), the current protection of the poor branch road of the described capacitor bridge of locking.
15. control protective unit according to claim 13, it is characterized in that, described judging unit is also according to the recognition result of described recognition unit, if the difference between the described current signal not branch road in preset range comprises total node branch road and does not comprise the poor branch road of capacitor bridge, the current signal sum that judgement arranges on each total node branch road the first current transformer is measured in same sampling instant, and the second current transformer that arranges on each total node branch road is in the current signal sum of same sampling instant measurement, whether meet respectively Kirchhoff's current law (KCL), if the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant, with the current signal sum of the second current transformer in same sampling instant measurement, all do not meet Kirchhoff's current law (KCL), indicate the difference current protection of the branch road in preset range not between the described current signal of described performance element locking.
16. control protective unit according to claim 15, it is characterized in that, described performance element is also according to the judged result of described judging unit, if the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant meets Kirchhoff's current law (KCL), utilize the set of the current signal that the first current transformer of arranging on described each branch road measures in same sampling instant, the series capacitance apparatus is carried out current protection; If the current signal sum that the second current transformer that arranges on described each total node branch road is measured in same sampling instant meets Kirchhoff's current law (KCL); utilize the set of the current signal that the second current transformer of arranging on described each branch road measures in same sampling instant, the series capacitance apparatus is carried out current protection.
17. control protective unit according to claim 13, is characterized in that,
Described performance element is also according to the recognition result of described recognition unit, if the difference between described current signal not the branch road in preset range comprise the poor branch road of capacitor bridge and do not comprise total node branch road, the current protection of the poor branch road of blocking capacitor bridge.
18. the described control protective unit of any one according to claim 12-17; it is characterized in that; described the first detecting unit specifically on described each branch road, detects the first current transformer and the second current transformer and whether meets criterion at the current signal that same sampling instant is measured respectively | i
T.i-i '
T.i|≤ε with
Current signal i wherein
T.iAnd i '
T.iBe respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein subscript T represents sampling instant, and subscript i represents i branch road, ε and ξ for default greater than zero numerical value; If respectively on described each branch road, the first current transformer and the second current transformer all meet described criterion at the current signal that same sampling instant is measured respectively, determine respectively on described each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is all in preset range; If respectively on described each branch road, the first current transformer and the second current transformer not all meet described criterion at the current signal that same sampling instant is measured respectively, determine respectively on described each branch road, the difference between the current signal of the current signal that the first current transformer is measured and the measurement of the second current transformer is not all in preset range.
19. the described control protective unit of any one according to claim 13-17, it is characterized in that, control protective unit also comprises the second detecting unit, be used for respectively at the difference branch road of each in preset range not, whether detect that the difference between the current signal measured of the current signal measured of the first current transformer and the second current transformer is not in preset range constantly M continuous sampling, M is the integer of presetting greater than zero; If M continuous sampling constantly the difference between the described current signal on described each branch road not in preset range, indicate described recognition unit identify between described current signal difference not the branch road in preset range whether comprise the poor branch road of capacitor bridge and/or total node branch road.
20. the described control protective unit of any one according to claim 13-17; it is characterized in that; the current signal sum that the first current transformer that arranges on described each the total node branch road of the concrete judgement of described judging unit is measured; and the current signal sum of the second current transformer measurement, whether meet respectively first condition
And second condition
Current signal i wherein
T.iAnd i '
T.iIt is respectively the current signal that the first current transformer of arranging on i branch road and the second current transformer are measured at sampling instant T, wherein n is the number of described each total node branch road, subscript T represents sampling instant, and subscript i represents i branch road, and δ is for presetting the numerical value greater than zero; , if the current signal sum that the first current transformer that arranges on described each total node branch road is measured meets first condition, determine that the current signal that the first current transformer that arranges on described each total node branch road is measured meets Kirchhoff's current law (KCL); , if the current signal sum that the second current transformer that arranges on described each total node branch road is measured meets second condition, determine that the current signal that the second current transformer that arranges on described each total node branch road is measured meets Kirchhoff's current law (KCL); If the current signal sum that the first current transformer that arranges on described each total node branch road is measured does not meet first condition, and the current signal sum that the second current transformer that arranges on described each total node branch road is measured does not meet second condition, determine the current signal sum that the first current transformer that arranges on described each total node branch road is measured in same sampling instant, current signal sum with the second current transformer is measured in same sampling instant, all do not meet Kirchhoff's current law (KCL).
21. according to claim 12-17, the described control protective unit of any one, is characterized in that, the series capacitance apparatus is fixed series capacitors compensation arrangement, thyristor controlled series capacitor compensation arrangement or series resonant-type fault current limiter device.
22. the control protection system of a series capacitance apparatus, it is characterized in that, described series capacitance apparatus comprises a plurality of branch roads, wherein said a plurality of branch road comprises the poor branch road of capacitor bridge and a plurality of total node branch road, wherein be respectively arranged with the first current transformer and second current transformer of redundancy each other on each branch road in described a plurality of branch roads, perhaps, be respectively arranged with the first current transformer of redundancy each other and the second current transformer and described bypass breaker branch road on each branch road in described a plurality of branch roads except the bypass breaker branch road and be in off-state, this control protection system comprises platform data acquisition system and the first protective device, wherein:
The platform data acquisition system, be used for the current signal of described a plurality of branch roads of measuring in same sampling instant respectively from each current transformer is carried out filtering, analog-to-digital conversion process, and the current signal after processing sends to the first protective device;
The first protective device, be used for receiving the current signal that described platform data acquisition system sends; Respectively on described each branch road, detect difference between the current signal of current signal that the first current transformer measures and the measurement of the second current transformer whether all in preset range; If the difference between the described current signal on described each branch road is in preset range, according to the set of the first current transformer that arranges on described each branch road at the current signal of same sampling instant measurement, perhaps, according to the set of the second current transformer that arranges at the current signal of same sampling instant measurement, the series capacitance apparatus is carried out current protection on described each branch road; If the difference between the described current signal on described each branch road is not all in preset range, the difference between the described current signal of locking is the current protection of the branch road in preset range not.
23. control protection system according to claim 22, is characterized in that, described the first protective device is specially the control protective unit of the described series capacitance apparatus of any one in claim 12-20.
24. control protection system according to claim 22, is characterized in that, the series capacitance apparatus is fixed series capacitors compensation arrangement, thyristor controlled series capacitor compensation arrangement or series resonant-type fault current limiter device.
25. control protection system according to claim 24 is characterized in that the thyristor controlled series capacitor compensation arrangement comprises the spark gap branch road.
26. control protection system according to claim 24, is characterized in that, the series resonant-type fault current limiter device comprises at least one in spark gap branch road and thyristor bypass branch.
27. control protection system according to claim 23; it is characterized in that; described control protection system system also comprises and described the first protective device the second protective device of redundancy each other; described the second protective device is identical with described the first protective device function; described the first protective device and the second protective device receive the current signal that described the first current transformer and the second current transformer are measured in same sampling instant respectively independently of one another, and carry out independently of one another the operation of latching current protection.
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| CN102244379B (en) * | 2011-07-11 | 2013-12-25 | 中电普瑞科技有限公司 | Method, device and system for controlling and protecting serial capacitors |
| CN102522825B (en) * | 2011-12-27 | 2014-08-27 | 中电普瑞科技有限公司 | Control and protection system for flexible alternating-current power transmission device |
| CN103078306B (en) * | 2013-01-09 | 2015-01-21 | 中国科学院电工研究所 | Fault current limiter on basis of combined rapid switch-on switch |
| CN103344843B (en) * | 2013-07-29 | 2015-10-14 | 国家电网公司 | A kind of measuring system of series capacitor compensation group |
| CN103682988B (en) * | 2013-11-30 | 2015-06-24 | 中国西电电气股份有限公司 | Spark discharge gap triggering device and method for series compensation |
| CN104155560B (en) * | 2014-07-09 | 2017-01-18 | 中国南方电网有限责任公司超高压输电公司检修试验中心 | Out-of-balance current protection method and system for II wiring capacitor group with inner fuse wires |
| CN104391211B (en) * | 2014-12-12 | 2017-06-06 | 国网山西省电力公司电力科学研究院 | A kind of repair based on condition of component on-line detecting system for series compensation device |
| CN110221572B (en) * | 2019-04-26 | 2021-04-20 | 北京龙鼎源科技股份有限公司 | System control method and device |
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