CN105826908B - Rapid distance protection method for power transmission line containing UPFC and device - Google Patents
Rapid distance protection method for power transmission line containing UPFC and device Download PDFInfo
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- CN105826908B CN105826908B CN201610309848.1A CN201610309848A CN105826908B CN 105826908 B CN105826908 B CN 105826908B CN 201610309848 A CN201610309848 A CN 201610309848A CN 105826908 B CN105826908 B CN 105826908B
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- 230000009471 action Effects 0.000 claims abstract description 21
- 230000001681 protective effect Effects 0.000 claims abstract description 11
- 230000008859 change Effects 0.000 claims description 19
- 230000005611 electricity Effects 0.000 claims description 13
- 238000005070 sampling Methods 0.000 claims description 5
- 230000007257 malfunction Effects 0.000 abstract description 6
- 238000005516 engineering process Methods 0.000 description 3
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Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H7/00—Emergency protective circuit arrangements specially adapted for specific types of electric machines or apparatus or for sectionalised protection of cable or line systems, and effecting automatic switching in the event of an undesired change from normal working conditions
- H02H7/26—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured
Abstract
The present invention relates to rapid distance protection method for power transmission line and device containing UPFC; by the maximum equivalent impedance for calculating UPFC in normal operation; in system jam; the maximum equivalent impedance that meter and when normal operation calculate when calculating Fault Compensation voltage; it can effectively prevent being used for the nearly sides UPFC when protective device; when negative direction outlet failure occurs, there are the risks of malfunction for quick distance protection；It can also prevent from being used for the remote sides UPFC when protective device simultaneously, when metallicity failure outside positive direction area occurs, quick distance protection has the risk for surmounting action.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System fields, and in particular to a kind of quick distance of transmission line of electricity containing UPFC
Guard method.
Background technology
THE UPFC (UPFC) with the trend of the control circuit of fast and flexible, can improve the trend distribution of power grid
Characteristic, maximizing electrical grid transmission ability；It is also equipped with damping system oscillation simultaneously, improves grid stability；Urgent power is provided
It supports, avoids extensive cutting load；Optimal Power Flow is distributed, and reduces circulation, reduces via net loss.UPFC to circuit by injecting phase
Angle and the controllable voltage phasor of amplitude, have been directly changed the first and last end potential feature of circuit, to further change in system
Potential phase and amplitude distribution, for whole region trend distribution play adjustment effect.Trends of the UPFC in control circuit
The change of transmission line parameter is also resulted in while distribution, larger capacitive may be presented in UPFC equiva lent impedances, and then causes
Traditional distance protection malfunction.
Quick distance protection is based on failure amount, is more than fixed threshold as operation equation using operating voltage Sudden Changing Rate, makees
It protects, is not influenced by load condition for fault component, there is stronger resistance to transition resistance ability.Quick distance protection is as fast
Fast Non-unit protection, the velocity removal proximal end catastrophe failure that can be exceedingly fast, to ensure the safe operation of power grid.To containing the defeated of UPFC
Electric line, when being installed on the nearly sides UPFC, when negative direction outlet failure occurs, there are the risks of malfunction for quick distance protection；When
The remote sides UPFC are installed on, when metallicity failure outside positive direction area occurs, quick distance protection has the risk for surmounting action.By
It is very fast in quick distance protection movement speed, it is possible to be acted before UPFC system ontology protection acts.Currently, in the industry also
There is no a kind of rapid distance protection method that can be suitable for the transmission line of electricity containing UPFC.
Invention content
The object of the present invention is to provide a kind of rapid distance protection method for power transmission line containing UPFC, for solving the prior art
Malfunction of distance protection when being used for UPFC circuits and the problem of surmount action.Meanwhile the present invention also provides one kind containing UPFC
The quick distance protection equipment of transmission line of electricity.
A kind of rapid distance protection method for power transmission line containing UPFC, includes the following steps：
(1) both sides line protective devices independently acquire each side voltage and the magnitude of current；
(2) UPFC maximum equivalent impedance Zs are calculated in real time in the case that route protection starting element is not operatingP；
(3) voltage variety and compensation current change quantity are calculated in real time after starting element action；
(4) Fault Compensation voltage is calculated according to voltage variety and compensation current change quantity；Using in step (2) when calculating
Route protection starting element action before UPFC maximum equivalent impedance ZsP；
(5) it is exported through deferred action after false voltage meets operating criterion.
Further, both sides voltage and current amount acquisition method is in the step (1)：The nearly sides UPFC voltage is measured
Line side PT, magnitude of current line taking road CT；For the remote sides UPFC voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road
CT。
Further, the formula of starting element is in the step (2)：|iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；
Wherein：iqdkFor the arbitrary phase current in each side；N is per cycle sampling number；In is CT load current values；Calculate UPFC maximum equivalents
Impedance ZPFormula is：Wherein：UPmaxFor UPFC Cascade System transformer maximum output voltage value；It is current
Electric current.
Further, in the step (3), voltage variety calculation formula is：Wherein：For current voltage phasor；It is voltage phasor before two weeks；It is arbitrary mutually or alternate；Current change quantity calculation formula
For：Wherein：For current flow phasor；For current zero-sequence current phase
Amount；For current flow phasor；It is zero sequence electric current phasor before two weeks；It is arbitrary mutually or alternate；The step
(4) voltage variety calculation formula is in：Wherein：It is protected for quickly distance
Protect impedance setting value；It is arbitrary mutually or alternate.
Further, operating criterion formula is in the step (5)：Wherein：UNFor voltage volume
Definite value；α is safety factor, and value range is 0~5, generally desirable 0.5；It is arbitrary mutually or alternate；Delay in step (5)
Dynamic adjusts, and delay calculation formula is：TP=(5- α) × 20ms；Wherein：α is the safety factor in operating criterion.
The present invention also provides a kind of quick distance protection equipments of the transmission line of electricity containing UPFC, including following module：
Module (1), both sides line protective devices independently acquire each side voltage and the magnitude of current；
Module (2), for calculating UPFC maximum equivalent impedance Zs in real time in the case that route protection starting element is not operatingP；
Module (3) calculates voltage variety and compensation current change quantity in real time after being acted for starting element；
Module (4), for calculating Fault Compensation voltage according to voltage variety and compensation current change quantity；It is used when calculating
The UPFC maximum equivalent impedance Zs before the action of route protection starting element in module (2)P；
Module (5) meets for working as false voltage and is exported through deferred action after operating criterion.
Further, both sides voltage and current amount acquisition method is in the module (1)：The nearly sides UPFC voltage is measured
Line side PT, magnitude of current line taking road CT；For the remote sides UPFC voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road
CT。
Further, the formula of starting element is in the module (2)：|iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；
Wherein：iqdkFor the arbitrary phase current in each side；N is per cycle sampling number；In is CT load current values；Calculate UPFC maximum equivalents
Impedance ZPFormula is：Wherein：UPmaxFor UPFC Cascade System transformer maximum output voltage value；It is current
Electric current.
Further, in the module (3), voltage variety calculation formula is：Wherein：For current voltage phasor；It is voltage phasor before two weeks；It is arbitrary mutually or alternate；Current change quantity calculation formula
For：Wherein：For current flow phasor；For current zero-sequence current phase
Amount；For current flow phasor；It is zero sequence electric current phasor before two weeks；It is arbitrary mutually or alternate；The module
(4) voltage variety calculation formula is in：Wherein：It is protected for quickly distance
Protect impedance setting value；It is arbitrary mutually or alternate.
Further, operating criterion formula is in the module (5)：Wherein：UNFor voltage volume
Definite value；α is safety factor, and value range is 0~5, generally desirable 0.5；It is arbitrary mutually or alternate；Delay in module (5)
Dynamic adjusts, and delay calculation formula is：TP=(5- α) × 20ms；Wherein：α is the safety factor in operating criterion.
Difference with the prior art of the present invention essentially consists in：In normal operation calculate UPFC maximum equivalent impedance and
It preserves, in system jam, when calculating Fault Compensation voltage, no longer calculates the maximum equivalent impedance of UPFC in real time, and use
The UPFC maximum equivalent impedances calculated and preserve before failure generation.This mode can effectively prevent using when protective device
In the nearly sides UPFC, when negative direction outlet failure occurs, there are the risks of malfunction for quick distance protection；It can be also prevented simultaneously as guarantor
Protection unit is used for the remote sides UPFC, and when metallicity failure outside positive direction area occurs, quick distance protection has the wind for surmounting action
Danger.
False voltage meets deferred action outlet dynamically adjusted after operating criterion, not only can effectively ensure that generation is serious
The quick-action of protection act when failure, it is also ensured that the reliability protected under weak fault condition.
Description of the drawings
Fig. 1 is the transmission line of electricity schematic diagram of the system containing UPFC；
Fig. 2 is the work flow diagram of the embodiment of the present invention.
Specific implementation mode
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Embodiment of the method
The rapid distance protection method for power transmission line containing UPFC of the method for the present invention embodiment is for the system access containing UPFC
In protection of alternating-current supply line.The transmission line of electricity of the system containing UPFC is as shown in Figure 1, quick distance protection workflow such as Fig. 2 institutes
Show, method includes the following steps：
(1) both sides line protective devices independently acquire each side voltage and the magnitude of current；
Both sides voltage and current amount acquisition method is：For the nearly sides UPFC voltage line taking trackside PT, magnitude of current line taking road
CT；Line side PT can use for the remote sides UPFC voltage and also can use bus bar side PT, magnitude of current line taking road CT.
(2) UPFC maximum equivalent impedance Zs are calculated in real time in the case that route protection starting element is not operatingP, starting protection
It no longer calculates, using the Z calculated before startupPFor calculation of fault；
The formula of starting element is：|iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein：iqdkFor the arbitrary mutually electricity in each side
Stream；N is per cycle sampling number；In is CT load current values.
UPFC maximum equivalent impedance ZsPCalculation formula is：Wherein：UPmaxFor UPFC Cascade System transformations
Device maximum output voltage value；For current flow.
(3) voltage variety and compensation current change quantity are calculated in real time after starting element action；
Voltage variety calculation formula is：Wherein：For current voltage phasor；It is voltage phasor before two weeks；It is arbitrary mutually or alternate.
Current change quantity calculation formula is：Wherein：For current flow
Phasor；For current zero-sequence current phasor；For current flow phasor；It is zero sequence electric current phasor before two weeks；
It is arbitrary mutually or alternate.
(4) Fault Compensation voltage is calculated according to voltage variety and compensation current change quantity；
Voltage variety calculation formula is：Wherein：For quick distance
Protect impedance setting value；It is arbitrary mutually or alternate.
(5) deferred action dynamically adjusted after false voltage meets operating criterion outlet.
Operating criterion formula is：Wherein：UNFor voltage rating；α is safety factor, is taken
Value ranging from 0~5, generally desirable 0.5；It is arbitrary mutually or alternate.
Dynamically the delay calculation formula of adjustment is：TP=(5- α) × 20ms；Wherein：α is the reliable system in operating criterion
Number.
In the present embodiment, by calculating the maximum equivalent impedance of UPFC in normal operation, in system jam, meter
The maximum equivalent impedance that meter and when normal operation calculate when calculating Fault Compensation voltage can be effectively prevent when protective device is for close
The sides UPFC, when negative direction outlet failure occurs, there are the risks of malfunction for quick distance protection；It can be also prevented simultaneously when protection dress
It sets and is used for the remote sides UPFC, when metallicity failure outside positive direction area occurs, quick distance protection has the risk for surmounting action.Into
One step, false voltage meet deferred action outlet dynamically adjusted after operating criterion, not only can effectively ensure that generation it is serious therefore
The quick-action of protection act when barrier, it is also ensured that the reliability protected under weak fault condition.
It the main idea of the present invention is the maximum equivalent impedance for calculating UPFC in normal operation and preserves, is sent out in system
Raw failure when calculating Fault Compensation voltage, no longer calculates the maximum equivalent impedance of UPFC in real time, and before using failure to occur
The UPFC maximum equivalent impedances for calculating and preserving.Therefore, the start-up criterion involved in above example, operating criterion, delay
Calculation formula, voltage and current variable quantity technology formula, offset voltage formula etc., as other embodiment, may be used
Other specific formula in the prior art are replaced.
Device embodiment
A kind of quick distance protection equipment of transmission line of electricity containing UPFC, including following module：
Module (1), both sides line protective devices independently acquire each side voltage and the magnitude of current；
Module (2), for calculating UPFC maximum equivalent impedance Zs in real time in the case that route protection starting element is not operatingP；
Module (3) calculates voltage variety and compensation current change quantity in real time after being acted for starting element；
Module (4), for calculating Fault Compensation voltage according to voltage variety and compensation current change quantity；It is used when calculating
The UPFC maximum equivalent impedance Zs before the action of route protection starting element in module (2)P；
Module (5) meets for working as false voltage and is exported through deferred action after operating criterion.
Above-mentioned each module is the device constituted with the one-to-one software function module of each step in embodiment of the method
It is a kind of software function framework, is stored in the memory of protective relaying device in the form of software code.Due to above-mentioned side
Step in method embodiment corresponds, and so it will not be repeated.
Under the thinking that the present invention provides, to above-mentioned implementation by the way of being readily apparent that those skilled in the art
Technological means in example is converted, is replaced, is changed, and is played the role of and the basic phase of relevant art means in the present invention
Goal of the invention that is same, realizing is also essentially identical, and the technical solution formed in this way is finely adjusted above-described embodiment to be formed, this
Kind technical solution is still fallen in protection scope of the present invention.
Claims (8)
1. a kind of rapid distance protection method for power transmission line containing UPFC, which is characterized in that include the following steps：
(1) both sides line protective devices independently acquire each side voltage and the magnitude of current；
(2) UPFC maximum equivalent impedances are calculated in real time in the case that route protection starting element is not operating
(3) voltage variety and compensation current change quantity are calculated in real time after starting element action；
(4) Fault Compensation voltage is calculated according to voltage variety and compensation current change quantity；Using the line in step (2) when calculating
Protect the UPFC maximum equivalent impedances before starting element action in road
(5) it is exported through deferred action after Fault Compensation voltage meets operating criterion；
In the step (3), voltage variety calculation formula is：Wherein：For current voltage
Phasor；It is voltage phasor before two weeks；It is arbitrary mutually or alternate；Current change quantity calculation formula is：Wherein：For current flow phasor；For current zero-sequence current phasor；It is electric current phasor before two weeks；It is zero sequence electric current phasor before two weeks；It is arbitrary mutually or alternate；The step (4)
Middle Fault Compensation voltage computing formula is：Wherein：For quick distance protection
Impedance setting value；It is arbitrary mutually or alternate.
2. the rapid distance protection method for power transmission line according to claim 1 containing UPFC, it is characterised in that：The step
(1) voltage and current amount acquisition method in both sides is in：For the nearly sides UPFC voltage line taking trackside PT, magnitude of current line taking road CT；
For the remote sides UPFC voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road CT.
3. the rapid distance protection method for power transmission line according to claim 1 or 2 containing UPFC, it is characterised in that：It is described
The formula of starting element is in step (2)：|iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein：iqdkFor the arbitrary phase in each side
Electric current；N is per cycle sampling number；In is CT load current values；Calculate UPFC maximum equivalent impedancesFormula is：Wherein：UPmaxFor UPFC Cascade System transformer maximum output voltage value；For current flow.
4. the rapid distance protection method for power transmission line according to claim 1 containing UPFC, it is characterised in that：The step
(5) operating criterion formula is in：Wherein：UNFor voltage rating；α is safety factor, value model
Enclose is 0~5；It is arbitrary mutually or alternate；Delay dynamic adjusts in step (5), and delay calculation formula is：TP=(5- α) ×
20ms；Wherein：α is the safety factor in operating criterion.
5. a kind of quick distance protection equipment of transmission line of electricity containing UPFC, which is characterized in that including following module：
Module (1) independently acquires each side voltage and the magnitude of current by both sides line protective devices；
Module (2), for calculating UPFC maximum equivalent impedances in real time in the case that route protection starting element is not operating
Module (3) calculates voltage variety and compensation current change quantity in real time after being acted for starting element；
Module (4), for calculating Fault Compensation voltage according to voltage variety and compensation current change quantity；Module is used when calculating
(2) the UPFC maximum equivalent impedances before the action of route protection starting element in
Module (5) meets for working as Fault Compensation voltage and is exported through deferred action after operating criterion；
In the module (3), voltage variety calculation formula is：Wherein：For current electricity
Press phasor；It is voltage phasor before two weeks；It is arbitrary mutually or alternate；Current change quantity calculation formula is：Wherein：For current flow phasor；For current zero-sequence current phasor；It is electric current phasor before two weeks；It is zero sequence electric current phasor before two weeks；It is arbitrary mutually or alternate；The module (4)
Middle Fault Compensation voltage computing formula is：Wherein：For quick distance protection
Impedance setting value；It is arbitrary mutually or alternate.
6. the quick distance protection equipment of the transmission line of electricity according to claim 5 containing UPFC, it is characterised in that：The module
(1) voltage and current amount acquisition method in both sides is in：For the nearly sides UPFC voltage line taking trackside PT, magnitude of current line taking road CT；
For the remote sides UPFC voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road CT.
7. the quick distance protection equipment of the transmission line of electricity according to claim 5 or 6 containing UPFC, it is characterised in that：It is described
The formula of starting element is in module (2)：|iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein：iqdkFor the arbitrary phase in each side
Electric current；N is per cycle sampling number；In is CT load current values；Calculate UPFC maximum equivalent impedancesFormula is：Wherein：UPmaxFor UPFC Cascade System transformer maximum output voltage value；For current flow.
8. the quick distance protection equipment of the transmission line of electricity according to claim 5 containing UPFC, it is characterised in that：The module
(5) operating criterion formula is in：Wherein：UNFor voltage rating；α is safety factor, value model
Enclose is 0~5；It is arbitrary mutually or alternate；Delay dynamic adjusts in module (5), and delay calculation formula is：TP=(5- α) ×
20ms；Wherein：α is the safety factor in operating criterion.
Priority Applications (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810904929.5A CN109245058B (en) | 2016-05-11 | 2016-05-11 | UPFC-containing power transmission line rapid distance protection method and device |
| CN201610309848.1A CN105826908B (en) | 2016-05-11 | 2016-05-11 | Rapid distance protection method for power transmission line containing UPFC and device |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201610309848.1A CN105826908B (en) | 2016-05-11 | 2016-05-11 | Rapid distance protection method for power transmission line containing UPFC and device |
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| CN201810904929.5A Division CN109245058B (en) | 2016-05-11 | 2016-05-11 | UPFC-containing power transmission line rapid distance protection method and device |
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| CN105826908B true CN105826908B (en) | 2018-08-03 |
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| CN201810904929.5A Active CN109245058B (en) | 2016-05-11 | 2016-05-11 | UPFC-containing power transmission line rapid distance protection method and device |
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Cited By (1)
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| KR102124736B1 (en) | 2017-05-26 | 2020-06-18 | 엔알 일렉트릭 컴퍼니 리미티드 | Method and apparatus for suppressing the influence of compensators on the distance protection performance of line protection equipment |
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| CN107086549B (en) * | 2017-05-22 | 2018-12-18 | 华北电力大学 | I segment protection method of distance of UPFC line attachment single-phase grounding fault |
| CN107104420B (en) * | 2017-05-22 | 2018-12-18 | 华北电力大学 | I segment protection method of route distance suitable for THE UPFC access |
| CN107240909B (en) * | 2017-05-26 | 2019-06-14 | 南京南瑞继保电气有限公司 | A kind of method and apparatus reducing influence of the compensator to route distance protection |
| CN107240908B (en) * | 2017-05-26 | 2018-12-21 | 南京南瑞继保电气有限公司 | A kind of method and apparatus reducing influence of the compensator to route distance protection |
| CN107069683B (en) * | 2017-05-26 | 2019-06-14 | 南京南瑞继保电气有限公司 | A kind of method and apparatus for eliminating influence of the compensator to route distance protection |
| CN108923394B (en) * | 2018-06-26 | 2020-03-20 | 南京南瑞继保工程技术有限公司 | Under-range distance protection method suitable for power transmission line containing unified power flow controller |
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| CN105826908A (en) | 2016-08-03 |
| CN109245058B (en) | 2021-01-01 |
| CN109245058A (en) | 2019-01-18 |
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