CN105826908A - Quick distance protection method and apparatus for power transmission line containing UPFC - Google Patents
Quick distance protection method and apparatus for power transmission line containing UPFC Download PDFInfo
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- CN105826908A CN105826908A CN201610309848.1A CN201610309848A CN105826908A CN 105826908 A CN105826908 A CN 105826908A CN 201610309848 A CN201610309848 A CN 201610309848A CN 105826908 A CN105826908 A CN 105826908A
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- 230000005540 biological transmission Effects 0.000 title claims abstract description 26
- 230000005611 electricity Effects 0.000 claims description 12
- 230000001681 protective effect Effects 0.000 claims description 7
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- 230000007257 malfunction Effects 0.000 abstract description 5
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- 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
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Abstract
The invention relates to a quick distance protection method and apparatus for a power transmission line containing an UPFC. The quick distance protection method and apparatus can effectively avoid the risk that misoperation occurs during the quick distance protection process by means of calculation of the maximum equivalent impedance of the UPFC during the normal operation process generally and by means of the calculated maximum equivalent impedance during the normal operation process when a system malfunctions and the fault compensation voltage is calculated; and at the same time the distance protection method and apparatus can also avoid the risk that a surpass motion exists in the quick distance protection process when the protection apparatus is used at the side being far away from the UPFC and when an outside-of-area metallic fault occurs in the positive direction.
Description
Technical field
The invention belongs to Relay Protection Technology in Power System field, be specifically related to a kind of rapid distance protection method for power transmission line Han UPFC.
Background technology
THE UPFC (UPFC), can improve the trend distribution character of electrical network, maximizing electrical grid transmission ability with the trend controlling circuit of fast and flexible；It is also equipped with damping system vibration simultaneously, improves grid stability；There is provided emergency DC power support, it is to avoid extensive cutting load；Optimal Power Flow is distributed, and reduces circulation, reduces via net loss.UPFC, by the voltage phasor controlled to circuit injection phase angle and amplitude, directly changes the first and last end electromotive force feature of circuit, thus changes the electromotive force phase place in system and amplitude distribution further, and regulation effect is played in the trend distribution for whole region.UPFC result also in the change of transmission line parameter while the trend distribution controlling circuit, and UPFC equiva lent impedance may present bigger capacitive, and then cause traditional distance protection misoperation.
Quickly distance protection is based on fault amount, uses running voltage Sudden Changing Rate more than fixing threshold as operation equation, protects as fault component, do not affected by load condition, have stronger resistance to transition resistance ability.Quickly distance protection is as quick Non-unit protection, and the velocity removal near-end catastrophe failure that can be exceedingly fast, to ensure the safe operation of electrical network.To the transmission line of electricity containing UPFC, when being installed on nearly UPFC side, when there is opposite direction outlet fault, there is the risk of malfunction in quick distance protection；When being installed on remote UPFC side, when metallicity fault outside positive direction district occurs, there is the risk surmounting action in quick distance protection.Owing to quick distance protection speed of action is very fast, it is possible to can action before UPFC system ontology protection act.At present, the most also there is no a kind of rapid distance protection method can being applicable to containing UPFC transmission line of electricity.
Summary of the invention
It is an object of the invention to provide a kind of rapid distance protection method for power transmission line Han UPFC, be used for the distance protection solving prior art malfunction when UPFC circuit and the problem surmounting action.Meanwhile, present invention also offers a kind of quick distance protection equipment of the transmission line of electricity Han UPFC.
A kind of rapid distance protection method for power transmission line containing UPFC, comprises the steps:
(1) both sides line protective devices independently gather each side voltage and the magnitude of current；
(2) in the case of route protection starting element is not operating, UPFC maximum equivalent impedance Z is calculated in real timeP；
(3) calculate voltage variety after starting element action in real time and compensate current change quantity；
(4) Fault Compensation voltage is calculated according to voltage variety and compensation current change quantity；The UPFC maximum equivalent impedance Z before the route protection starting element action in step (2) is used during calculatingP；
(5) export through deferred action after false voltage meets operating criterion.
Further, in described step (1), both sides voltage and current amount acquisition method is: for nearly UPFC side voltage line taking trackside PT, magnitude of current line taking road CT；For remote UPFC side voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road CT.
Further, in described step (2), the formula of starting element is: | iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein: iqdkFor any phase current in each side；N is every cycle sampling number；In is CT load current value；Calculate UPFC maximum equivalent impedance ZPFormula is:Wherein: UPmaxFor UPFC Cascade System transformator maximum output voltage value；For current flow.
Further, in described step (3), voltage variety computing formula is:Wherein:For current voltage phasor；It it is voltage phasor before two weeks；For arbitrarily phase or alternate；Current change quantity computing formula is:Wherein:For current flow phasor；For current zero-sequence current phasor；For current flow phasor；It it is zero sequence electric current phasor before two weeks；For arbitrarily phase or alternate；In described step (4), voltage variety computing formula is:Wherein:For quick distance protection impedance setting value；For arbitrarily phase or alternate.
Further, in described step (5), operating criterion formula is:Wherein: UNFor voltage rating；α is safety factor, and its span is 0～5, the most desirable 0.5；For arbitrarily phase or alternate；In step (5), time delay dynamically adjusts, and time delay computing formula is: TP=(5-α) × 20ms；Wherein: α is the safety factor in operating criterion.
Present invention also offers a kind of quick distance protection equipment of the transmission line of electricity containing UPFC, including such as lower module:
Module (1), both sides line protective devices independently gather each side voltage and the magnitude of current；
Module (2), for calculating UPFC maximum equivalent impedance Z in real time in the case of route protection starting element is not operatingP；
Module (3), calculates voltage variety after starting element action in real time and compensates current change quantity；
Module (4), for calculating Fault Compensation voltage according to voltage variety and compensation current change quantity；The UPFC maximum equivalent impedance Z before the route protection starting element action in module (2) is used during calculatingP；
Module (5), for exporting through deferred action after false voltage meets operating criterion.
Further, in described module (1), both sides voltage and current amount acquisition method is: for nearly UPFC side voltage line taking trackside PT, magnitude of current line taking road CT；For remote UPFC side voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road CT.
Further, in described module (2), the formula of starting element is: | iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein: iqdkFor any phase current in each side；N is every cycle sampling number；In is CT load current value；Calculate UPFC maximum equivalent impedance ZPFormula is:Wherein: UPmaxFor UPFC Cascade System transformator maximum output voltage value；For current flow.
Further, in described module (3), voltage variety computing formula is:Wherein:For current voltage phasor；It it is voltage phasor before two weeks；For arbitrarily phase or alternate；Current change quantity computing formula is:Wherein:For current flow phasor；For current zero-sequence current phasor；For current flow phasor；It it is zero sequence electric current phasor before two weeks；For arbitrarily phase or alternate；In described module (4), voltage variety computing formula is:Wherein:For quick distance protection impedance setting value；For arbitrarily phase or alternate.
Further, in described module (5), operating criterion formula is:Wherein: UNFor voltage rating；α is safety factor, and its span is 0～5, the most desirable 0.5；For arbitrarily phase or alternate；In module (5), time delay dynamically adjusts, and time delay computing 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: calculates the maximum equivalent impedance of UPFC when properly functioning and preserves, at system jam, when calculating Fault Compensation voltage, calculate the maximum equivalent impedance of UPFC the most in real time, and use the UPFC maximum equivalent impedance calculating and preserving before fault generation.This mode can effectively prevent when protection device is for nearly UPFC side, and when there is opposite direction outlet fault, quick distance protection exists the risk of malfunction；Still preventing when protection device is for remote UPFC side, when there is metallicity fault outside positive direction district, there is the risk surmounting action in quick distance protection simultaneously.
The deferred action outlet that false voltage is dynamically adjusted after meeting operating criterion, not only can effectively ensure that the quick-action of protection act when there is catastrophe failure, it is also ensured that the reliability of protection under weak failure condition.
Accompanying drawing explanation
Fig. 1 is the transmission line of electricity schematic diagram containing UPFC system；
Fig. 2 is the workflow diagram of the embodiment of the present invention.
Detailed description of the invention
The present invention will be further described in detail below in conjunction with the accompanying drawings.
Embodiment of the method
Being used in the protection of alternating-current supply line containing UPFC system access containing UPFC rapid distance protection method for power transmission line of the inventive method embodiment.Transmission line of electricity containing UPFC system is as it is shown in figure 1, quickly distance protection workflow is as in figure 2 it is shown, method comprises the following steps:
(1) both sides line protective devices independently gather each side voltage and the magnitude of current；
Both sides voltage and current amount acquisition method is: for nearly UPFC side voltage line taking trackside PT, magnitude of current line taking road CT；For voltage desirable line side, remote UPFC side the most desirable bus bar side PT of PT, magnitude of current line taking road CT.
(2) in the case of route protection starting element is not operating, UPFC maximum equivalent impedance Z is calculated in real timeP, starting protection no longer calculates, and uses the Z calculated before startingPFor calculation of fault；
The formula of starting element is: | iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein: iqdkFor any phase current in each side；N is every cycle sampling number；In is CT load current value.
UPFC maximum equivalent impedance ZPComputing formula is:Wherein: UPmaxFor UPFC Cascade System transformator maximum output voltage value；For current flow.
(3) calculate voltage variety after starting element action in real time and compensate current change quantity；
Voltage variety computing formula is:Wherein:For current voltage phasor；It it is voltage phasor before two weeks；For arbitrarily phase or alternate.
Current change quantity computing formula is:Wherein:For current flow phasor；For current zero-sequence current phasor；For current flow phasor；It it is zero sequence electric current phasor before two weeks；For arbitrarily phase or alternate.
(4) Fault Compensation voltage is calculated according to voltage variety and compensation current change quantity；
Voltage variety computing formula is:Wherein:For quick distance protection impedance setting value；For arbitrarily phase or alternate.
(5) dynamically adjusted after false voltage meets operating criterion deferred action outlet.
Operating criterion formula is:Wherein: UNFor voltage rating；α is safety factor, and its span is 0～5, the most desirable 0.5；For arbitrarily phase or alternate.
The time delay computing formula dynamically adjusted is: TP=(5-α) × 20ms；Wherein: α is the safety factor in operating criterion.
In the present embodiment; by calculating the maximum equivalent impedance of UPFC when properly functioning; when system jam; the maximum equivalent impedance calculated when counting and be properly functioning when calculating Fault Compensation voltage; can effectively prevent when protection device is for nearly UPFC side; when there is opposite direction outlet fault, there is the risk of malfunction in quick distance protection；Still preventing when protection device is for remote UPFC side, when there is metallicity fault outside positive direction district, there is the risk surmounting action in quick distance protection simultaneously.Further, the deferred action outlet that false voltage is dynamically adjusted after meeting operating criterion, not only can effectively ensure that the quick-action of protection act when there is catastrophe failure, it is also ensured that the reliability of protection under weak failure condition.
The central scope of the present invention is to calculate the maximum equivalent impedance of UPFC when properly functioning and preserve, at system jam, when calculating Fault Compensation voltage, calculate the maximum equivalent impedance of UPFC the most in real time, and use the UPFC maximum equivalent impedance calculating and preserving before fault generation.Therefore, the start-up criterion that relates in above example, operating criterion, time delay computing formula, voltage x current variable quantity technology formula, compensate voltage equation etc., as other embodiments, other concrete formula of the prior art all can be used to be replaced.
Device embodiment
A kind of quick distance protection equipment of the transmission line of electricity containing UPFC, including such as lower module:
Module (1), both sides line protective devices independently gather each side voltage and the magnitude of current；
Module (2), for calculating UPFC maximum equivalent impedance Z in real time in the case of route protection starting element is not operatingP；
Module (3), calculates voltage variety after starting element action in real time and compensates current change quantity；
Module (4), for calculating Fault Compensation voltage according to voltage variety and compensation current change quantity；The UPFC maximum equivalent impedance Z before the route protection starting element action in module (2) is used during calculatingP；
Module (5), for exporting through deferred action after false voltage meets operating criterion.
Above-mentioned each module is and each step software function module one to one in embodiment of the method, and its device constituted is a kind of software function framework, is stored in the memorizer of protective relaying device with the form of software code.Due to the step one_to_one corresponding in said method embodiment, therefore repeat no more.
Under the thinking that the present invention is given; use the mode being readily apparent that to those skilled in the art that the technological means in above-described embodiment is converted, replaces, revised; and the goal of the invention that the effect played is essentially identical with the relevant art means in the present invention, realize is the most essentially identical; the technical scheme so formed is finely adjusted formation to above-described embodiment, and this technical scheme still falls within protection scope of the present invention.
Claims (10)
1. the rapid distance protection method for power transmission line containing UPFC, it is characterised in that comprise the steps:
(1) both sides line protective devices independently gather each side voltage and the magnitude of current；
(2) in the case of route protection starting element is not operating, UPFC maximum equivalent impedance Z is calculated in real timeP；
(3) calculate voltage variety after starting element action in real time and compensate current change quantity；
(4) Fault Compensation voltage is calculated according to voltage variety and compensation current change quantity；The UPFC maximum equivalent impedance Z before the route protection starting element action in step (2) is used during calculatingP；
(5) export through deferred action after false voltage meets operating criterion.
Rapid distance protection method for power transmission line containing UPFC the most according to claim 1, it is characterised in that: in described step (1), both sides voltage and current amount acquisition method is: for nearly UPFC side voltage line taking trackside PT, magnitude of current line taking road CT；For remote UPFC side voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road CT.
Rapid distance protection method for power transmission line containing UPFC the most according to claim 1 and 2, it is characterised in that: in described step (2), the formula of starting element is: | iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein: iqdkFor any phase current in each side；N is every cycle sampling number；In is CT load current value；Calculate UPFC maximum equivalent impedance ZPFormula is:Wherein: UPmaxFor UPFC Cascade System transformator maximum output voltage value；For current flow.
Rapid distance protection method for power transmission line containing UPFC the most according to claim 3, it is characterised in that: in described step (3), voltage variety computing formula is:Wherein:For current voltage phasor；It it is voltage phasor before two weeks；For arbitrarily phase or alternate；Current change quantity computing formula is:Wherein:For current flow phasor；For current zero-sequence current phasor；For current flow phasor；It it is zero sequence electric current phasor before two weeks；For arbitrarily phase or alternate；In described step (4), voltage variety computing formula is:Wherein:For quick distance protection impedance setting value；For arbitrarily phase or alternate.
Rapid distance protection method for power transmission line containing UPFC the most according to claim 4, it is characterised in that: in described step (5), operating criterion formula is:Wherein: UNFor voltage rating；α is safety factor, and its span is 0～5, the most desirable 0.5；For arbitrarily phase or alternate；In step (5), time delay dynamically adjusts, and time delay computing formula is: TP=(5-α) × 20ms；Wherein: α is the safety factor in operating criterion.
6. the quick distance protection equipment of transmission line of electricity containing UPFC, it is characterised in that include such as lower module:
Module (1), both sides line protective devices independently gather each side voltage and the magnitude of current；
Module (2), for calculating UPFC maximum equivalent impedance Z in real time in the case of route protection starting element is not operatingP；
Module (3), calculates voltage variety after starting element action in real time and compensates current change quantity；
Module (4), for calculating Fault Compensation voltage according to voltage variety and compensation current change quantity；The UPFC maximum equivalent impedance Z before the route protection starting element action in module (2) is used during calculatingP；
Module (5), for exporting through deferred action after false voltage meets operating criterion.
The quick distance protection equipment of transmission line of electricity containing UPFC the most according to claim 6, it is characterised in that: in described module (1), both sides voltage and current amount acquisition method is: for nearly UPFC side voltage line taking trackside PT, magnitude of current line taking road CT；For remote UPFC side voltage line taking trackside PT or bus bar side PT, magnitude of current line taking road CT.
8. according to the quick distance protection equipment of the transmission line of electricity containing UPFC described in claim 6 or 7, it is characterised in that: in described module (2), the formula of starting element is: | iqd[k]| ＞ 1.25 | iqd[k-2N]|+0.1In；Wherein: iqdkFor any phase current in each side；N is every cycle sampling number；In is CT load current value；Calculate UPFC maximum equivalent impedance ZPFormula is:Wherein: UPmaxFor UPFC Cascade System transformator maximum output voltage value；For current flow.
The quick distance protection equipment of transmission line of electricity containing UPFC the most according to claim 8, it is characterised in that: in described module (3), voltage variety computing formula is:Wherein:For current voltage phasor；It it is voltage phasor before two weeks；For arbitrarily phase or alternate；Current change quantity computing formula is:Wherein:For current flow phasor；For current zero-sequence current phasor；For current flow phasor；It it is zero sequence electric current phasor before two weeks；For arbitrarily phase or alternate；In described module (4), voltage variety computing formula is:Wherein:For quick distance protection impedance setting value；For arbitrarily phase or alternate.
The quick distance protection equipment of the transmission line of electricity containing UPFC the most according to claim 9, it is characterised in that: in described module (5), operating criterion formula is:Wherein: UNFor voltage rating；α is safety factor, and its span is 0～5, the most desirable 0.5；For arbitrarily phase or alternate；In module (5), time delay dynamically adjusts, and time delay computing 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 |
|---|---|---|---|
| CN201610309848.1A CN105826908B (en) | 2016-05-11 | 2016-05-11 | Rapid distance protection method for power transmission line containing UPFC and device |
| CN201810904929.5A CN109245058B (en) | 2016-05-11 | 2016-05-11 | UPFC-containing power transmission line rapid distance protection method and device |
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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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| CN105826908A true CN105826908A (en) | 2016-08-03 |
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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 (9)
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| CN106374442A (en) * | 2016-10-21 | 2017-02-01 | 南京南瑞继保电气有限公司 | Distance protection accurate compensation method for installing circuit of series equipment |
| CN107069683A (en) * | 2017-05-26 | 2017-08-18 | 南京南瑞继保电气有限公司 | A kind of method and apparatus of influence of the elimination compensator to circuit distance protection |
| CN107086549A (en) * | 2017-05-22 | 2017-08-22 | 华北电力大学 | The segment protection method of distance I of UPFC line attachment single-phase grounding faults |
| CN107104420A (en) * | 2017-05-22 | 2017-08-29 | 华北电力大学 | The segment protection method of circuit distance I accessed suitable for THE UPFC |
| CN107240909A (en) * | 2017-05-26 | 2017-10-10 | 南京南瑞继保电气有限公司 | A kind of method and apparatus of influence of the reduction compensator to circuit distance protection |
| CN107240908A (en) * | 2017-05-26 | 2017-10-10 | 南京南瑞继保电气有限公司 | A kind of method and apparatus of influence of the reduction compensator to circuit distance protection |
| WO2018214864A1 (en) * | 2017-05-26 | 2018-11-29 | 南京南瑞继保电气有限公司 | Method and apparatus for suppressing impact of compensator on line distance protection |
| CN108923394A (en) * | 2018-06-26 | 2018-11-30 | 南京南瑞继保工程技术有限公司 | Deficient range distance guard method suitable for the transmission line of electricity containing THE UPFC |
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| CN106374442A (en) * | 2016-10-21 | 2017-02-01 | 南京南瑞继保电气有限公司 | Distance protection accurate compensation method for installing circuit of series equipment |
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| CN107104420A (en) * | 2017-05-22 | 2017-08-29 | 华北电力大学 | The segment protection method of circuit distance I accessed suitable for THE UPFC |
| CN107240909A (en) * | 2017-05-26 | 2017-10-10 | 南京南瑞继保电气有限公司 | A kind of method and apparatus of influence of the reduction compensator to circuit distance protection |
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| WO2018214864A1 (en) * | 2017-05-26 | 2018-11-29 | 南京南瑞继保电气有限公司 | Method and apparatus for suppressing impact of compensator on line distance protection |
| US10965114B2 (en) | 2017-05-26 | 2021-03-30 | Nr Electric Co., Ltd. | Method and apparatus for suppressing impact of compensator on line distance protection |
| CN107069683A (en) * | 2017-05-26 | 2017-08-18 | 南京南瑞继保电气有限公司 | A kind of method and apparatus of influence of the elimination compensator to circuit 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 |
| 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 |
| CN107240908A (en) * | 2017-05-26 | 2017-10-10 | 南京南瑞继保电气有限公司 | A kind of method and apparatus of influence of the reduction compensator to circuit distance protection |
| RU2733785C1 (en) * | 2017-05-26 | 2020-10-06 | ЭнАр ЭЛЕКТРИК КО., ЛТД | Method and device for suppression of compensator effect on line protection of lines |
| EP3618212A4 (en) * | 2017-05-26 | 2020-05-27 | NR Electric Co., Ltd. | Method and apparatus for suppressing impact of compensator on line 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 |
| CN108923394A (en) * | 2018-06-26 | 2018-11-30 | 南京南瑞继保工程技术有限公司 | Deficient range distance guard method suitable for the transmission line of electricity containing THE UPFC |
| CN113937722A (en) * | 2020-07-14 | 2022-01-14 | 南京南瑞继保工程技术有限公司 | Transmission line relay protection system adapting to series reactor access |
| CN113937722B (en) * | 2020-07-14 | 2023-12-29 | 南京南瑞继保工程技术有限公司 | Transmission line relay protection system suitable for series reactor access |
Also Published As
| Publication number | Publication date |
|---|---|
| CN109245058A (en) | 2019-01-18 |
| CN109245058B (en) | 2021-01-01 |
| CN105826908B (en) | 2018-08-03 |
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