CN100452604C - Energy position tandem protection method and device for extra-high voltage transmission line - Google Patents
Energy position tandem protection method and device for extra-high voltage transmission line Download PDFInfo
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- CN100452604C CN100452604C CNB2006100149990A CN200610014999A CN100452604C CN 100452604 C CN100452604 C CN 100452604C CN B2006100149990 A CNB2006100149990 A CN B2006100149990A CN 200610014999 A CN200610014999 A CN 200610014999A CN 100452604 C CN100452604 C CN 100452604C
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Abstract
This invention puts forward an energy direction pilot protection method and a device based on Bergeion model and faulty component, in which, the method utilizes symbols of active energy measured at both ends of the circuit and utilizes the model to compensate the voltage of both ends to the circuit middle point to solve the problem that the active energy direction element can not judge the faulty direction correctly since the resistance is very small in the system when the positive direction of the circuit is faulty.
Description
Technical field
The present invention relates to power system transmission line relaying protection field, particularly the relay protecting method of UHV transmission line.
Background technology
Direction comparison expression pilot protection have quick-action completely, the traffic little, less demanding to traffic rate and channel performance, do not require advantage such as two end data strict synchronism, be one of main protection of adopting on the ultra-high-tension power transmission line, it also is one of emphasis of relaying protection research simultaneously always; Direction component is the core of direction comparison expression pilot protection.Therefore, the performance of direction component has determined the performance of whole protecting to a great extent.
There are the following problems for traditional energy position element:
The fault component voltage that traditional meritorious energy position element is the circuit end and the instantaneous value of fault component electric current are made product and are carried out the meritorious energy that integration obtains then, utilize its size and Orientation to judge that circuit has or not the foundation of district's internal and external fault and fault direction, its major defect is owing to resistance in the system is very little, and meritorious energy position element can not the correct decision fault direction during circuit positive direction fault.The direction component of reflection apparent energy is subjected to the direction that the influence of distributed capacitance can not the correct decision fault when being used for extra-high voltage transmission line.
Introduced the concise and to the point present situation of this professional domain prior art above.Construction is the national grid of key rack with extra high voltage line, is that the science of power industry sustainable development is selected.At present, China has built the 750kv circuit, is about to start building 1,000,000 volts of power transmission lines of long distance, and this just has higher requirement to relaying protection, the invention solves the difficult problem that conventional art faces, and has more urgent realistic meaning.
Summary of the invention
Problem to be solved by this invention is the defective that overcomes above-mentioned prior art, proposes a kind of meritorious energy position tandem guard method of fault component formula that is applied to the ultra high voltage long distance transmission line.
For this reason, the present invention adopts following technical scheme:
A kind of energy position tandem guard method comprises the following steps:
(1) sets reference point (k) and energy definite value (Δ W);
(2) gather the instantaneous value of protection circuit top (m), terminal (n) each phase voltage and electric current in real time, and try to achieve protection circuit top (m), terminal (n) voltage, failure of the current component;
(3) circuit top (m), terminal (n) electric current and voltage fault component are carried out phase-Mo conversion, utilize the Bei Ruilong method to calculate the voltage failure component modulus of reference point (k), and the voltage failure component that is calculated is carried out the voltage failure component phasor that mould-phase transformation obtains reference point (k);
(4) utilize the half-wave Fourier transform to try to achieve the effective value and the phase angle of reference point (k) voltage failure component, in like manner obtain the effective value and the phase angle of the current failure component of circuit top (m), terminal (n);
(5) try to achieve circuit top (m), terminal (n) current failure component and the reference point of calculating from respective end respectively
(k) phase angle difference between the voltage failure component;
(6) with circuit top (m) current failure component effective value, utilize the voltage failure component effective value of the reference point (k) that the Bei Ruilong method calculates from circuit top (m), and the cosine value of phase angle difference multiplies each other between the two, carry out integration then, obtain meritorious energy (the Δ W of fault component at circuit top (m)
m), be half power frequency cycle of system the time of integration; In like manner try to achieve meritorious energy (the Δ W of line end (n) fault component
n);
(7) for circuit top (m) protection, when adopting blocking mode pilot protection, if the meritorious energy of the fault component of circuit top (m) is greater than energy definite value (Δ W
m＞Δ W), promptly fault has taken place in the opposite direction of circuit top (m) as can be known, and block signal is sent in protection, the protection of locking two ends; And if the meritorious energy of the fault component of circuit top (m) is less than negative value (the Δ W of energy definite value
m＜-Δ W), promptly fault has taken place in the positive direction of circuit top (m) as can be known, does not then send out block signal.If block signal is not all received in the both sides protection, then protection tripping operation;
When adopting permission formula pilot protection, if the meritorious energy of the fault component of circuit top (m) is less than negative value (the Δ W of energy definite value
m＜-Δ W), then is illustrated in positive direction fault has taken place,, allow the opposite end tripping operation so send the permission signal to the opposite end;
(8) for line end (n) protection, when adopting blocking mode pilot protection, if the meritorious energy of the fault component of line end (n) is greater than energy definite value (Δ W
n＞Δ W), promptly fault has taken place in the opposite direction of line end (n) as can be known, and block signal is sent in protection, the protection of locking two ends; And if the meritorious energy of the fault component of line end (n) is less than negative value (the Δ W of energy definite value
n＜-Δ W), promptly fault has taken place in the positive direction of line end (n) as can be known, does not then send out block signal, if block signal is not all received in the both sides protection, and then protection tripping operation;
When adopting permission formula pilot protection, if the meritorious energy of the fault component of line end (n) is less than negative value (the Δ W of energy definite value
m＜-Δ W), sends the permission signal to the opposite end so, allow the opposite end tripping operation;
In technique scheme, reference point (k) preferably is selected near the circuit mid point; Protection energy definite value Δ W is an arithmetic number, the uneven energy in the time of can selecting a desired value normally to move in order to the system of escaping according to the actual conditions of system in actual applications.
The present invention proposes energy position tandem guard method based on Bei Ruilong model and fault component; the symbol of this guard method and the protective device utilization meritorious energy that the protection of circuit two ends measures in the fault component network; utilize simultaneously the Bei Ruilong model with the voltage compensation at circuit two ends to the circuit mid point, solved that resistance when circuit positive direction fault because in the system is very for a short time to cause the problem that the energy position element of gaining merit can not the correct decision fault direction.This protective device has the characteristic of factor affecting such as not being subjected to system's transient process, transition resistance, serial compensation capacitance, thereby the reliability of protection is improved greatly.And the sensitivity of protective device is not subjected to the influence of fault type and abort situation, has high reliability, and responsiveness is also very fast simultaneously.
Fig. 1 electric power system basic principle figure;
Fig. 2 fault component systematic schematic diagram;
The software flow schematic diagram of Fig. 3 energy position tandem guard method of the present invention row fault verification;
Fig. 4 realizes the hardware block diagram of protective device of the present invention;
Embodiment
Basic principle figure as shown in Figure 1.According to principle of stacking, the state behind the line failure can be decomposed into normal system and fault component system.Based on the fault component system, at first by fault component voltage, the electric current of circuit head end, try to achieve the voltage of circuit mid point with the Bei Ruilong algorithm, carry out the meritorious energy of fault component that integration is tried to achieve head end with the fault component electric current of this voltage and head end; In like manner, try to achieve the voltage of circuit mid point, carry out integration with this voltage and terminal fault component electric current and try to achieve the meritorious energy of end fault component by fault component voltage, the electric current of line end.
When system normally moved, in theory owing to the fault-free component, the fault component energy was zero; Electric current is a positive direction to flow into circuit from bus all, and then when reverse direction failure, the meritorious energy that close fault point one end calculates sends block signal for just, locking two ends protection (when adopting blocking mode pilot protection); When the positive direction troubles inside the sample space, the meritorious energy that calculate at two ends all is negative, does not send block signal, and protection can be tripped.Perhaps all send the permission signal, allow opposite end tripping operation (when adopting permission formula pilot protection) to the opposite end.Thereby constitute direction comparison expression pilot protection.
When line failure, can be decomposed into normal condition and fault additivity (that is fault component system); In the fault component system,, as shown in Figure 2, can try to achieve the voltage failure component Δ μ of circuit mid point (or more arbitrarily) respectively by circuit top m and terminal n according to the Bei Ruilong model
M_k(t), Δ u
N_k(t); So the meritorious energy of the fault component at Dui Ying circuit two ends is respectively Δ W
m, Δ W
nΔ W
mBe the meritorious energy of fault component that circuit top calculates, Δ W
nIt is the meritorious energy of fault component that line end calculates; Under the situation of normal operation, there is not fault component in the system, so Δ W in theory
m=Δ W
n=0; Outside the circuit generating region under the situation of fault, Δ W
m＞0 and Δ W
n＜0 (short circuit in the other direction of m end) or Δ W
m＜0 and Δ W
n＞0 (short circuit in the other direction of n end); Under the situation of circuit generating region internal fault, Δ W
m＜0 and Δ W
n＜0.
The software of energy position tandem protective device of the present invention can be divided into monitoring program and defence program two parts.So-called monitoring program is that the human-computer dialogue plug-in unit is the program that keyboard commands processing, plug-in unit debugging, definite value input or modification, report demonstration etc. are disposed.This program is positioned over human-computer dialogue plug-in unit (MONITOR) (below the relevant plug-in unit introduction being arranged).So-called defence program promptly refers to the program that protective device is moved under normal operation and fault condition.Defence program is divided into three modules:
1 main program: comprise initialization, self check comprehensively, opening and wait for interruption; This subprogram places among the protection CPU;
2 interrupt service routines: sampling interruption, serial port interruption etc. are arranged usually, and the former comprises data acquisition and processing, is mainly finished jointly by of ac input plug-in unit (AC) and analog-to-digital conversion (AD) module; The startup of protection is judged, is also finished in interrupt service routine; The data between protection CPU and the monitoring CPU of finishing the serial port interrupt service routine transmit and communicate by letter.
3 exception handles: comprise fault initiating, fault direction judge, to the opposite end send out block signal or allow signal, protection outlet tripping operation or alarm and etc., these functions will by protection CPU by the signal plug-in unit, open into plug-in unit, alarm plug-in, logica board, tripping operation plug-in unit and wait and finish.
The software flow pattern that the fault initiating of this protection, fault direction are judged as shown in Figure 3.The software flow that fault direction is judged is described below:
(1) sets reference point (k) and energy definite value Δ W (being real number) greater than zero;
(2 gather in real time protection beginning, last two ends (m, the n) instantaneous value of each phase voltage and electric current, and try to achieve protection both end voltage, failure of the current component (fault component was not zero when circuit broke down);
(3) circuit both end voltage current failure component is carried out phase-Mo conversion, utilize the Bei Ruilong method to calculate the voltage failure component modulus of reference point (k), carry out the voltage failure component phasor that mould-phase transformation obtains reference point (k);
(4) utilize the half-wave Fourier transform to try to achieve the effective value and the phase angle of reference point (k) voltage failure component, in like manner obtain the effective value and the phase angle of the current failure component at circuit two ends;
(5) try to achieve the home terminal current fault component and reference point (k) the voltage failure component that calculates from this end between phase angle difference; In like manner can get the corresponding phase angle difference of an other end;
(6) be example with the protection of circuit m end; m is held current failure component effective value, utilizes the voltage failure component effective value of the reference point (k) that the Bei Ruilong method calculates and the phase angle difference cosine value integration then that multiplies each other between the two from m end, obtain the meritorious energy Δ W of fault component of m end
m, be half power frequency cycle of system the time of integration; In like manner try to achieve the meritorious energy Δ W of n end fault component
n
(7) be example with the protection of circuit m end, as Δ W
mDuring＞Δ W, promptly fault has taken place in the opposite direction of circuit m end as can be known, and block signal is sent in protection, locking two ends protection (when adopting blocking mode pilot protection); And as Δ W
mDuring＜-Δ W, promptly fault has taken place in the positive direction of circuit m end as can be known, does not then send out block signal, if block signal is not all received in the both sides protection, then protection can be tripped.Perhaps all send the permission signal, allow opposite end tripping operation (when adopting permission formula pilot protection) to the opposite end; The criterion of n end protection is identical with the m end with action behavior.
The structured flowchart of energy position tandem protective device of the present invention as shown in Figure 4, below just it is further introduced in conjunction with Fig. 4.
(1) of ac input plug-in unit (AC)
This plug-in unit is responsible for voltage transformer, and the signal transformation of Current Transformer Secondary end 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) 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.
(3) protection CPU card
This plug-in unit is the core of device, and CPU card is in order to finish defencive function.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 and various timer; 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.
(4) human-computer dialogue plug-in unit (MONITOR)
This plug-in unit can be finished following various function in order to human-computer dialogue: CPU card is patrolled and examined, in time react the operating state of 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.
(5) 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, and suppresses common mode disturbances, improves the reliability of protective device work.
(6) 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-way switch amount input circuit.
(7) alarm and logica board (ALARM﹠amp; LOGIC)
This plug-in unit is provided with following alarm relay: the CPU card alarm relay is driven by CPU card; Patrol and examine the interruption alarm relay, drive by CPU; 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 contact.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.
(8) tripping operation plug-in unit (TRIP)
This plug-in unit has been installed starting relay, tripping operation exit relay, has been jumped out a mouthful relay, multiple switching relay, reclosing post acceleration relay forever.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.
(9) 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 Interference component, 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 set up protective device according to Fig. 4 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, along with the increase of sample frequency and the shortening of calculating step-length, the precision of protection can improve greatly.
Need to prove that the present invention mainly is a kind of innovation and creation of innovation to some extent on method, each plug-in unit that protective device is related all belongs to prior art and existing various ways and application.Its detail characteristic is not described herein again at this.Relevant Bei Ruilong model, Guo Zheng, He Jiali are published in the paper " new principle of power transmission line longitudinal differential protection " of " Automation of Electric Systems " 2004,28 (11) and have done detailed introduction.And, here the detailed explanation that has been center deployment with embodiments of the invention, the imbody of described optimal way or some characteristic, should be understood to this specification only is to describe the present invention by the mode that provides embodiment, in fact on some details of forming, construct and using, can change to some extent, comprise the combination and the assembly of parts, these distortion and application all should belong in the scope of the present invention.
Claims (2)
1. an energy position tandem guard method that is used for extra-high voltage transmission line comprises the following steps:
(1) sets reference point (k) and energy definite value;
(2) gather the instantaneous value of protection circuit top (m), terminal (n) each phase voltage and electric current in real time, and try to achieve protection circuit top (m), terminal (n) voltage, failure of the current component;
(3) circuit top (m), terminal (n) electric current and voltage fault component are carried out phase-Mo conversion, utilize the Bei Ruilong method to calculate the voltage failure component modulus of reference point (k), and the voltage failure component that is calculated is carried out the voltage failure component phasor that mould-phase transformation obtains reference point (k);
(4) utilize the half-wave Fourier transform to try to achieve the effective value and the phase angle of reference point (k) voltage failure component, in like manner obtain the effective value and the phase angle of the current failure component of circuit top (m), terminal (n);
(5) try to achieve respectively circuit top (m), terminal (n) current failure component with from the phase angle difference between reference point (k) the voltage failure component of respective end calculating;
(6) with circuit top (m) current failure component effective value, utilize the voltage failure component effective value of the reference point (k) that the Bei Ruilong method calculates and the cosine value of phase angle difference between the two from circuit top (m), multiply each other, integration then, obtain the meritorious energy of fault component at circuit top (m), be half power frequency cycle of system the time of integration; In like manner try to achieve the meritorious energy of line end (n) fault component;
(7) protect for circuit top (m), when adopting blocking mode pilot protection, energy is greater than the energy definite value if the fault component of circuit top (m) is gained merit, and promptly fault has taken place the opposite direction of circuit top (m) protection as can be known, block signal is sent in protection, the protection of locking two ends; And if the meritorious energy of the fault component of circuit top (m) is less than the negative value of energy definite value, promptly fault has taken place in the positive direction of circuit top (m) protection as can be known, does not then send out block signal, if block signal is not all received in the both sides protection, and then protection tripping operation;
When adopting permission formula pilot protection,, allow line end (n) tripping operation if the meritorious energy of the fault component of circuit top (m) sends the permission signal to line end (n) so less than the negative value of energy definite value;
(8) protect for line end (n), when adopting blocking mode pilot protection, energy is greater than the energy definite value if the fault component of line end (n) is gained merit, and promptly fault has taken place the opposite direction of line end (n) protection as can be known, block signal is sent in protection, the protection of locking two ends; And if the meritorious energy of the fault component of line end (n) is less than the negative value of energy definite value, promptly fault has taken place in the positive direction of line end (n) protection as can be known, if block signal is not all received in the both sides protection, and then protection tripping operation;
When adopting permission formula pilot protection,, allow circuit top (m) tripping operation if the meritorious energy of the fault component of line end (n) then sends the permission signal to circuit top (m) less than the negative value of energy definite value.
2. energy position tandem guard method according to claim 1, reference point (k) is selected near the circuit mid point.
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|---|---|---|---|
| CNB2006100149990A CN100452604C (en) | 2006-07-28 | 2006-07-28 | Energy position tandem protection method and device for extra-high voltage transmission line |
Applications Claiming Priority (1)
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|---|---|---|---|
| CNB2006100149990A CN100452604C (en) | 2006-07-28 | 2006-07-28 | Energy position tandem protection method and device for extra-high voltage transmission line |
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| CN1913275A CN1913275A (en) | 2007-02-14 |
| CN100452604C true CN100452604C (en) | 2009-01-14 |
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| CN102496916B (en) * | 2011-11-30 | 2013-12-25 | 中国南方电网有限责任公司 | Switch failure protection method using electric network wide area information |
| CN102723701A (en) * | 2012-06-20 | 2012-10-10 | 湖州电力局 | Remote optical signal locking protection device |
| CN103762564B (en) * | 2014-01-14 | 2016-10-19 | 昆明理工大学 | A kind of transient energy direction protection method of band SSSC transmission line of electricity |
| CN103812095A (en) * | 2014-02-27 | 2014-05-21 | 国家电网公司 | Directional pilot protection method for power distribution network containing distributed generation |
| CN104201656B (en) * | 2014-07-01 | 2017-11-10 | 昆明理工大学 | A kind of pilot protection method for carrying out Simulation after test using current temporary state amount with Thyristor Controlled Seriescompensation transmission line of electricity |
| CN104659767B (en) * | 2014-11-05 | 2018-05-11 | 昆明理工大学 | A kind of triangle loop grid cell protection method using overlapping sequences difference |
| CN105518958B (en) * | 2014-11-13 | 2018-06-12 | Abb瑞士股份有限公司 | DC power network currents differential protecting method and its system |
| CN106300295B (en) * | 2016-09-07 | 2018-09-28 | 南京南瑞继保电气有限公司 | A kind of dual sensitivity Bei Ruilong differential protecting methods of half-wavelength transmission line of alternation current |
| CN108123424B (en) * | 2017-12-29 | 2019-09-24 | 国电南瑞科技股份有限公司 | A kind of ring network power supply relay protecting method for taking into account quick-action and selectivity |
| CN109613398B (en) * | 2018-12-12 | 2021-11-09 | 国网山东省电力公司电力科学研究院 | Fault direction discrimination method and discrimination element for high-voltage alternating current-direct current hybrid power grid |
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