CN100459356C - Split-phase current phase differential protecting method for extra-high voltage transmission line - Google Patents
Split-phase current phase differential protecting method for extra-high voltage transmission line Download PDFInfo
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- CN100459356C CN100459356C CNB200610014366XA CN200610014366A CN100459356C CN 100459356 C CN100459356 C CN 100459356C CN B200610014366X A CNB200610014366X A CN B200610014366XA CN 200610014366 A CN200610014366 A CN 200610014366A CN 100459356 C CN100459356 C CN 100459356C
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Abstract
The invention belongs to the electric power system transmission line relay protecting domain, it relates to the method of the special high voltage transmission line relay protection. The invention puts forward the special high voltage transmission line separating phase current phase different protection method based on the Bergeron model. The current phase difference and/or the current fault heft phase difference are used for the protecting acting mete. The closedown angle is adjusted to realize the judge of the failure without the effect of the distributing capacitance current. The protecting method of the invention can distinguish the exception class and the phase difference, the judge of the failures is exact, credible and quick.
Description
Technical field
The present invention relates to power system transmission line relaying protection field, particularly the method for extra-high voltage transmission line relaying protection.
Background technology
The differential carrier current protection of traditional phase place is to utilize complex filter (for example positive sequence component of electric current and negative sequence component complex filter) that the synthetic electric current of three-phase current is carried out bit comparison mutually, its shortcoming is for dissimilar short-circuit reaction sensitivity differences, some short-circuit-type is difficult to differentiate, and secondly is that can not to differentiate fault separate; And when using single-phase excision, single phase autoreclosing, must be furnished with special phase selection element.Even more serious is that above-mentioned guard method is influenced greatly by line distribution capacitance, is difficult to be applied to be the ultra high voltage long-distance transmission line relaying protection of significant distributed capacitance characteristic.At present, China is about to start building long distance 750 kilovolts and 1,000,000 volts of power transmission lines, presses for and solves this difficult problem.
The Bei Ruilong model is a kind of more accurate transmission line model; relation when it has reflected the inner fault-free of transmission line between (comprising steady operation and external area error) both end voltage electric current; and then can derive the electric current and voltage phase relation of any point both sides on the circuit, that is the protection condition of being failure to actuate with the Bei Ruilong model.And when circuit generation internal fault, being equivalent to has increased a node in the fault point, and this relation is destroyed, the protection inevitable action.
Phasor u with the protection installation place
M φ, i
M φ(Φ=a, b, c) is converted to modulus u by transition matrix S
Mi, i
Mi(i=0,1,2), Bei Ruilong model are a kind of circuit Equivalent Model of all setting up on each modulus.
If u
m, i
mAnd u
n, i
nBe respectively voltage, the current-mode component at circuit two ends, the electric current positive direction is defined as by bus and flows to circuit.Then both end voltage electric current modulus satisfies on the circuit:
[u
m(t)?i
m(t)]
T＝T[u
n(t)?i
n(t)]
T (1)
Transmission matrix T is the two-dimensional matrix by line parameter circuit value decision, has so just set up any point electric current and voltage on the circuit and has protected relation between the electric current and voltage of installation place.
Summary of the invention
The present invention's " split-phase current phase differential protecting " technical problem to be solved is to overcome an above-mentioned difficult problem; provide a kind of and not only various short-circuit-type are had identical discriminating power; has phase-selecting function; and not influenced by line distribution capacitance, be applicable to the method for ultra high voltage long distance transmission line relaying protection.In addition, it is a kind of based on a kind of invention thought that the present invention also provides, and except can overcoming an above-mentioned difficult problem, also transition resistance had a kind of extra-high voltage transmission line phase-splitting fault component current phase differential protecting method of very high ability to bear.
A kind of technical scheme provided by the invention is:
A kind of split-phase current phase differential protecting method for extra-high voltage transmission line comprises the following steps:
(1) sets reference point (k), current and phase difference locking angle
(2) utilize microcomputer protecting device to gather protection both sides (m, n) each phase voltage and current value in real time;
(3) protection both sides sampled value is carried out phase-mould conversion, utilize the electric current modulus of Bei Ruilong method calculating reference point (k) both sides, and the electric current modulus of being calculated is carried out the electric current phasor that mould-phase transformation obtains reference point (k) both sides;
(4) electric current phasor by k point both sides calculates its phase difference
(5) if phase difference
Be less than or equal to 180 ° and current and phase difference locking angle
Difference, perhaps phase difference
More than or equal to 180 ° and current and phase difference locking angle
Sum judges that then working as prior fault is the protection range troubles inside the sample space, and failure judgement type, separate sends trip signal by microcomputer protecting device then, otherwise, judge that working as prior fault is the protection range external area error, microcomputer protecting device is failure to actuate.
In such scheme, current and phase difference locking angle when realizing with Microcomputer Protection
Adjusting can be less than 45 ° (600km long 1150kV circuits), littler than similar other protections.So scheme has higher sensitivity with similar other protective ratios.
The present invention also proposes another based on the extra-high voltage transmission line phase-splitting fault component current phase differential protecting method with a kind of invention thought, comprises the following steps:
(1) sets reference point (k), described current failure component phase difference locking angle
(2) utilize microcomputer protecting device gather in real time the protection both sides (m, n) each phase voltage and current value, and try to achieve the protection both sides electric current and voltage fault components (fault component was not 0 when circuit broke down);
(3) protection both sides electric current and voltage fault component is carried out phase-mould conversion, utilize the current failure component modulus of Bei Ruilong method calculating reference point (k) both sides, and the current failure component modulus of being calculated is carried out the current failure component phasor that mould-phase transformation obtains reference point (k) both sides;
(4) its phase difference of current failure component phasor calculation by reference point (k) both sides
(5) if phase difference
Be less than or equal to 180 ° and current failure component phase difference locking angle
Difference, perhaps phase difference
More than or equal to 180 ° and current failure component phase difference locking angle
Sum judges that then working as prior fault is the protection range troubles inside the sample space, and failure judgement type, separate sends trip signal by microcomputer protecting device then, otherwise, judge that working as prior fault is the protection range external area error, microcomputer protecting device is failure to actuate.
Because the fault component electric current is produced by fault point power supply in the fault additivity network, sensitivity is not subjected to the influence of both sides electromotive force angle and vibration.So should consider the integrity problem of external area error emphatically.The current failure component phase difference locking angle of this method
Can be set at locking angle greater than additive method, for example 100 ° (the 1150kV circuit that 600km is long), reliability is than the additive method height.
As preferred embodiment, second kind of split-phase current phase differential protecting method for extra-high voltage transmission line can be combined with first kind of guard method, adopt two kinds of guard methods simultaneously.
In each above-mentioned technical scheme, reference point is preferably circuit mid point or serial compensation capacitance mounting points.
The Bei Ruilong type is to be based upon the accurate model on the electromagnetic wave communication process on the power transmission line.Adopt the Bei Ruilong model carry out the calculation of fault nature consideration the influence of distributed capacitance, automatically counted capacitance current based on this model split-phase current phase differential protecting, no longer need to carry out condenser current compensation.Therefore relay protecting method provided by the invention is compared with existing guard method, and is more accurate and reliable.And, because the method provided by the invention phase difference of each phase relatively, so in theory for the short circuit of generation any kind, protective device can both the separate and fault type of correct decision fault, and correct operation.The present invention also has phase-selecting function, no longer additionally needs to install phase selector.
Second kind of technical scheme provided by the invention is a kind of ultra high voltage long distance transmission line relay protecting method that transition resistance is had very high ability to bear.In addition, the inventor also organically combines two kinds of guard methods, proposes a kind of preferred embodiment, and this scheme has also improved troubles inside the sample space quick-action characteristic greatly in the reliability of relay protection that improves not tripping of troubles inside the sample space.
Description of drawings
The trouble-free situation of Fig. 1 transmission line malfunction model-line-internal;
The out of order situation of Fig. 2 transmission line malfunction model-line-internal;
Fig. 3 employing split-phase current phase differential protecting method of the present invention carries out the software flow schematic diagram of fault verification;
Fig. 4 employing phase-splitting of the present invention fault component current phase differential protecting method carries out the software flow schematic diagram of fault verification;
The software flow schematic diagram of the fault verification of Fig. 5 a kind of preferred embodiment of the present invention;
The microcomputer protecting device structured flowchart that Fig. 6 adopts guard method of the present invention to realize.
Embodiment
Can be with the Bei Ruilong model according to the voltage and current of power transmission line top voltage and current by any point on the modular transformation computational scheme.If there is not fault on the circuit, or outside, On-line Fault road, then circuit must satisfy the Bei Ruilong model.Can on power transmission line, select a reference point k (generally being chosen as circuit mid point or serial compensation capacitance mounting points), after application Bei Ruilong model is calculated this both sides electric current, judge the phase relation of this both sides electric current.(do not comprise steady operation and external area error) when protected circuit has internal fault, as Fig. 1, the m point all satisfies the Bei Ruilong model to k point and n point to the circuit between the k point, k point both sides current i
MkAnd i
NkCan calculate, after Fu Shi filtering, obtain I
Mk, I
NkThereby, can try to achieve its phase place
Should have this moment in theory:
When circuit generation internal fault, break down to for example shown in Figure 2 with reference point right side f point, the n point no longer satisfies the Bei Ruilong model to the circuit between the k point, then certainly leads to very big actuating quantity.Therefore this method can be distinguished the line areas internal and external fault.So the suitable locking angle of adjusting, take into account the various factors influence,
When external area error and steady operation, must drop in the locking angular region; And when internal fault, must drop on not malfunction in the time of so just can guaranteeing normal operation or external area error in the operating angle scope beyond the locking angle, not tripping of internal fault.The protection operating criterion is after considering the locking angle:
Or
In the formula
Be the locking angle, about
Adjust and must consider the both-end communication delay, factors such as directional error,
Can be taken at 35 ° to 60 ° interval interior value, as preferred embodiment, can adjust is 45 °.Because this method is the phase difference of each phase relatively, so the short circuit of any kind takes place in theory, protection can both the separate and fault type of correct decision fault, and correct operation.The influence of capacitance current has automatically been considered in this new guard method, no longer needs to carry out condenser current compensation.The software flow pattern of this method as shown in Figure 3.
In order to overcome the shortcoming a little less than the differential current method is born the transition resistance ability, can be with electric current fault component phase difference as the protection actuating quantity.Method above similar, when protected circuit does not have internal fault, can be in the hope of the current failure component Δ I of reference point k point both sides
Mk, Δ I
NkThereby, can try to achieve its phase place
In theory, fault component was not 0 when circuit broke down,
When circuit generation internal fault, reference point k both sides have at least a side no longer to satisfy the Bei Ruilong model.Same protection operating criterion is
Or
In the formula
Be the locking angle, about
Adjust with above-mentioned split-phase current phase differential method in
It is similar to adjust.Remove and consider the both-end communication delay, outside the factors such as directional error,
Can adjust is 60～100 °.100 ° is to guarantee more reliable setting value under the protection action correctness situation, can require to adjust separately according to the real protection sensitivity.The method is equally based on the Bei Ruilong model, so also be not subjected to the influence of capacitance current.And bear the transition resistance ability and improved greatly, this kind method can be used separately, and its software flow is as shown in Figure 4.
Software flow shown in Figure 5 organically combines preceding two kinds of methods, can be used as the preferred embodiments of the invention.Concrete performing step is as follows:
(1) the voltage and current value of the protected circuit both sides that at first collect in real time with protective relaying device is tried to achieve the voltage failure component and the current failure component of circuit both sides.
(2) the electric current and voltage sampled value of circuit both sides is carried out mutually-modular transformation with the electric current and voltage fault component of trying to achieve, be converted to modulus.Phase-modular transformation matrix S can be selected symmetrical component method transformation matrix, card human relations Bel transformation matrix etc.
(3) with Bei Ruilong equation (1), calculate the electric current modulus and the current failure component modulus of protection range reference point k both sides respectively.
(4) electric current modulus and the current failure component with the k point both sides that calculate carries out mould-phase inversion, calculates the phasor value of k point both sides electric current and current failure component.
(5) calculate current failure component phase angle, k point both sides, and ask both sides current failure component phase poor
(6) calculate k point both sides current phase angle, and ask the both sides current and phase difference
(7) judge whether to satisfy
Or
Make the protection would trip if satisfy then send out tripping operation; If do not satisfy then execution (8).
(8) judge whether to satisfy
Or
Make the protection would trip if satisfy then send out tripping operation; If satisfied then protection is failure to actuate.
The structured flowchart of microcomputer protecting device of the present invention such as Fig. 6 do introduction below in conjunction with Fig. 6 to hardware configuration.
(1) of ac input plug-in unit (AC)
This plug-in unit is responsible for the system voltage instrument transformer, and the signal transformation of Current Transformer Secondary side forceful electric power becomes the required weak electric signal of protective device, plays strong and weak electricity simultaneously and isolates and anti-interference effect.
(2) analog starting component
This plug-in unit can be set up according to user's needs, does not draw among Fig. 2.
(3) AD analog-to-digital conversion module
This plug-in unit is responsible for converting five road voltages and four road current analog amounts by plug-in unit 1 output to digital quantity that microcomputer can directly be handled.
(4) protection CPU1 plug-in unit
This plug-in unit is the core of device, and two identical CPU card are in order to finish two cover independent protection functions, promptly protect 1 with protection 2.Single-chip microprocessor MCU or DSP are used for carrying out various defence programs; ROM chip EPROM is in order to deposit defence program; Read-write memory RAM chip is used for depositing sampled value and computational process, intermediate object program and sign; Electric erasable programmable memory device chip EEPROM is used for depositing the protection definite value; Counter is used for sample count; The parallel port extended chip is used for switching value input, output; In addition this card also should have address latch and address decoder as required.
(5) with plug-in unit 3
(6) protection CPU2 plug-in unit
With plug-in unit 4, protect 2 on the structure.Be used to move another set of different defence program, as the backup protection of protection 1.
(7) human-computer dialogue plug-in unit (MONITOR)
This plug-in unit can be finished following various function in order to human-computer dialogue: each CPU card is patrolled and examined, in time react the operating state of each CPU card; Print cpu information, all reports are exported by printer automatically by the human-computer dialogue plug-in unit in the protection running; Hardware clock; Serial communication interface, this plug-in unit are provided with the RS232 serial communication interface, each protection information can be sent to host computer and relevant terminal.
(8) switching value input plug-in unit (DI)
This plug-in unit inside is made up of every the loop multichannel light, be used for switching value with the outside by light every being incorporated into CPU, realize control to the protective device function.Open into the power source specials that adopt, as the 24V power supply more.And fast light every effect be make cpu power (+5V), and open into power supply (24V), electric the going up of AD conversion electric power (15V) isolated, thereby further suppresses common mode disturbances, improves the reliability of microcomputer work.
(9) signal with open into plug-in unit (SIGNAL﹠amp; DI)
This plug-in unit has been installed three magnetic latching relays as the trip signal relay, jump signal relay, reclosing signal relay and call signal relay, protection action central signal relay, reclosing action central signal relay and release relay forever.Signal on this plug-in unit can be by hand resetting.In addition, this plug-in unit also has four tunnel amounts of opening the light input circuit.
(10) alarm and logica board (ALARM ﹠amp; LOGIC)
This plug-in unit is provided with following alarm relay: two CPU card alarm relays, and the CPU card by correspondence drives respectively; Patrol and examine the interruption alarm relay, drive by CPU1,2; Total alarm relay is driven by the human-computer dialogue plug-in unit; The dead electricity alarm relay normally is in attracting state, and relay returns when losing 5V or 24V power supply, provides dead electricity alarm central signal by normally closed node.All alarm relays all have self-sustaining, by hand resetting.This plug-in unit also is provided with logical circuit, comprises following relay: exit relay, the heavy motor type relay of tripping operation, tripping operation fixed relay.The heavy motor type relay of tripping operation moves when exit relay moves, and returns immediately when the protection exit relay returns.The tripping operation fixed relay moves when exit relay moves, and remains to the involution of whole group always, promptly remains to always and removes self-sustaining when starting relay is returned.
(11) tripping operation plug-in unit (TRIP)
This plug-in unit installed starting relay, the tripping operation exit relay, jump out a mouthful relay forever, multiple switching relay closes the post acceleration relay.Starting relay is the always open relay of double as simultaneously; connect the loop of other relay coil by its normal opened contact to negative supply; the tripping operation exit relay is quick dry-reed relay; to guarantee quick acting; but in order to increase number of connections; with the tripping operation exit relay in parallel a sealed relay, be used for the occasions not high such as starting switch failure protection to rate request, starting relay and other relay are sealed relay.
(12) power insert
This plug-in unit is the inverter plug-in unit, direct current 220V or 110V voltage at first insert this plug-in unit again by a filter circuit filtering high frequency and interference components, utilizing inverse method to export three groups of required voltages of this device is 24V, 5V is 15V, three groups of voltages are not all not altogether, and adopt floating short side formula, do not link to each other with shell.
Can make up protective device according to Fig. 6 in the practical application, and then work out defence program, can finish the complete protection of a cover according to the present invention.Utilize microcomputer and optical-fibre channel to realize very high precision and speed being arranged this method, because the traffic that needs is much smaller than additive method and method, along with the increase of sample frequency and the shortening of calculating step-length, the precision of protection can improve greatly.
Claims (2)
1. an extra-high voltage transmission line phase-splitting fault component current phase differential protecting method comprises the following steps:
(1) sets reference point (k), current failure component phase difference locking angle
(2) utilize microcomputer protecting device to gather protection both sides (m, n) each phase voltage and current value, and try to achieve protection both sides electric current and voltage fault component in real time;
(3) protection both sides electric current and voltage fault component is carried out phase-Mo conversion, utilize the current failure component modulus of Bei Ruilong method calculating reference point (k) both sides, and the current failure component modulus of being calculated is carried out the current failure component phasor that mould-phase transformation obtains reference point (k) both sides;
(4) its phase difference of current failure component phasor calculation by reference point (k) both sides
(5) if phase difference
Be less than or equal to 180 ° and current failure component phase difference locking angle
Difference, perhaps phase difference
More than or equal to 180 ° and current failure component phase difference locking angle
Sum judges that then working as prior fault is the protection range troubles inside the sample space, and failure judgement type, separate sends trip signal by microcomputer protecting device then, otherwise, judge that working as prior fault is the protection range external area error, microcomputer protecting device is failure to actuate.
2. extra-high voltage transmission line phase-splitting fault component current phase differential protecting method according to claim 1 is characterized in that described reference point is circuit mid point or serial compensation capacitance mounting points.
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| CNB200610014366XA CN100459356C (en) | 2006-06-16 | 2006-06-16 | Split-phase current phase differential protecting method for extra-high voltage transmission line |
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| CNB200610014366XA CN100459356C (en) | 2006-06-16 | 2006-06-16 | Split-phase current phase differential protecting method for extra-high voltage transmission line |
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| CN100459356C true CN100459356C (en) | 2009-02-04 |
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| EP2580828A1 (en) * | 2010-06-14 | 2013-04-17 | ABB Research Ltd. | Fault protection of hvdc transmission lines |
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| CN102868137A (en) * | 2012-09-27 | 2013-01-09 | 沈阳工业大学 | Method and device for controlling ultrahigh-voltage transmission line single-phase automatic reclosing |
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| CN105140894B (en) * | 2015-08-07 | 2018-09-25 | 许继电气股份有限公司 | A kind of power distribution network differential protecting method based on Phase Difference Principle |
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