CN103268429B - Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection - Google Patents
Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection Download PDFInfo
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- CN103268429B CN103268429B CN201310225122.6A CN201310225122A CN103268429B CN 103268429 B CN103268429 B CN 103268429B CN 201310225122 A CN201310225122 A CN 201310225122A CN 103268429 B CN103268429 B CN 103268429B
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Abstract
The invention discloses a performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection. The method comprises the following steps of: step 1, traversing and scanning asymmetric faults of an alternating-current (AC) electric network in an AC/DC interconnected network in which the high-voltage DC power transmission system stays, and determining an AC fault range influencing the DC 100Hz protection; step 2, determining a time boundary for the faults in the AC fault range, and also determining a delay constant value delta t of the DC 100Hz protection; and step 3, comparing the delay constant value delta t and an upper boundary t1, an upper boundary t2 and a shortest time t3, and evaluating the performance of DC100Hz protection. The system comprises a simulation module, a protection module and an evaluation module. The method and the system integrate the advantages of a short-circuit current calculation program and a PSCAD/EMTDC (power system computer aided design/electromagnetic transient simulation for DC) simulation computing program, fast recognition of the AC fault range influencing the DC 100Hz protection can be realized, and a simple, high-efficiency and practical engineering method is provided for evaluating the performance of DC100Hz protection.
Description
Technical field
The present invention relates to high voltage power transmission technical field, be specifically related to method of evaluating performance and the system of a kind of HVDC (High Voltage Direct Current) transmission system 100Hz protection.
Background technology
Along with development and the application of high voltage dc transmission technology, AC-DC interconnecting power network is formed gradually, the coordination of AC system relay protection and straight-flow system Control protection and coordinating ensureing that the safe and stable operation of electrical network is significant.Direct current 100Hz protection is the typical defencive function that alternating current-direct current Control protection cooperatively interacts, and to constitute a threat to arrange to prevent from exchanging main protection tripping or malfunctioning switch etc. the normal operation of straight-flow system or the safety of DC equipment.If fault in ac transmission system cannot excise or the mute time is long, direct current 100Hz likely will be caused to protect deferred action, thus reduce the through-put power of straight-flow system, even locking direct current.The locking of wall scroll or many direct currents, by seriously jeopardizing the safe and stable operation of electrical network, causes an immeasurable loss.Therefore, the performance that direct current 100Hz protects produces material impact by the safe and stable operation of electrical network.
At present, the research protected about direct current 100Hz mainly concentrates in cooperatively interacting etc. of the improvement of protection and alternating current-direct current, and there is no the method for complete set, system for the evaluation of direct current 100Hz protective value.
Prior art is compared, and the advantage that patent of the present invention has is: the advantage that present invention incorporates short-circuit current calculation program and PSCAD/EMTDC simulation calculation program, achieves the quick identification affecting the AC fault scope that direct current 100Hz protects.The present invention propose with set up based on direct current 100Hz protection act time limit and the shortest time relative size exchanging the DC current 100Hz component that main protection operation time limit, back-up protection operation time limit and DC equipment can be born; the performance evaluation protected for direct current 100Hz provides a kind of simple practical engineering method efficiently; operations staff is grasped, assesses the performance of direct current 100Hz protection; the timely performance improving 100Hz protection; thus reduce the incorrect operation of 100Hz protection, ensure that the safe and stable operation of AC-DC interconnecting power network is significant.
Summary of the invention
The method of evaluating performance that the object of the present invention is to provide a kind of HVDC (High Voltage Direct Current) transmission system 100Hz to protect and system; the performance evaluation protected for direct current 100Hz sets up relatively uniform a, rounded system; make the Performance Appraisal System that direct current 100Hz protects; and have intuitive and practicality, the performance protected for design and running human assessment direct current 100Hz provides a kind of simple practical engineering method efficiently.
For realizing above object, the technical scheme that the present invention takes is:
A method of evaluating performance for HVDC (High Voltage Direct Current) transmission system 100Hz protection, comprises the following steps:
Step 1, traverse scanning is carried out to the AC network unbalanced fault in the AC-DC interconnecting power network at described HVDC (High Voltage Direct Current) transmission system place, determine to affect the AC fault scope that direct current 100Hz protects;
Step 2, fault for described AC fault scope, determine time boundary, simultaneously and determine the time delay definite value t that direct current 100Hz protects
Δ, described time boundary comprises the coboundary t exchanging main protection operation time limit
1, exchange the coboundary t of back-up protection operation time limit
2, and the shortest time t of DC current 100Hz component that can bear according to the stress limit curve characteristic determination DC equipment of DC equipment
3;
Step 3, compare time delay definite value t
Δwith coboundary t
1, coboundary t
2, shortest time t
3relative size, to direct current 100Hz protect performance make evaluation.
Described step 1 specifically comprises the following steps:
Step 11, traverse scanning is carried out to the unbalanced fault situation of the AC network in the AC-DC interconnecting power network at described HVDC (High Voltage Direct Current) transmission system place, try to achieve the negative sequence voltage of change of current bus;
Step 12, simulation calculation make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act;
Step 13, determine to affect the AC fault scope that direct current 100Hz protects, described AC fault scope is the set that change of current bus negative sequence voltage is greater than the AC fault of change of current bus minimal negative sequence voltage.
Described coboundary t
1< time delay definite value t
Δ< shortest time t
3.
Described performance in step 3 comprises first level, second level and third level, and the condition wherein meeting first level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| >|t
Δ-t
3|, the condition meeting second level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| <|t
Δ-t
3|, the condition meeting third level is: t
1<t
Δ<t
2<t
3.
Described time delay definite value t
Δ, coboundary t
1with coboundary t
2all be embodied in the protection definite value inventory that relay protection producer submits to according to designing requirement.
A Performance Appraisal System for HVDC (High Voltage Direct Current) transmission system 100Hz protection, it comprises:
Emulation module, carries out traverse scanning for the AC network unbalanced fault in the AC-DC interconnecting power network to described HVDC (High Voltage Direct Current) transmission system place, determines the AC fault scope affecting direct current 100Hz protection;
Protection module, for the fault of described AC fault scope, determines time boundary, simultaneously and determine the time delay definite value t that direct current 100Hz protects
Δ, described time boundary comprises the coboundary t exchanging main protection operation time limit
1, exchange the coboundary t of back-up protection operation time limit
2, and the shortest time t of DC current 100Hz component that can bear according to the stress limit curve characteristic determination DC equipment of DC equipment
3;
Evaluation module, for comparing time delay definite value t
Δwith coboundary t
1, coboundary t
2, shortest time t
3relative size, to direct current 100Hz protect performance make evaluation.
Described emulation module comprises:
Calculation of short-circuit current module, the unbalanced fault situation for the AC network in the AC-DC interconnecting power network to described HVDC (High Voltage Direct Current) transmission system place carries out traverse scanning, tries to achieve the negative sequence voltage of change of current bus;
PSCAD/EMTDC emulation module, makes the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act for simulation calculation;
Parsing module, determine the AC fault scope affecting direct current 100Hz protection, described AC fault scope is the set that change of current bus negative sequence voltage is greater than the AC fault of change of current bus minimal negative sequence voltage.
Described coboundary t
1< time delay definite value t
Δ< shortest time t
3.
Described performance in evaluation module comprises first level, second level and third level, and the condition wherein meeting first level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| >|t
Δ-t
3|, the condition meeting second level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| <|t
Δ-t
3|, the condition meeting third level is: t
1<t
Δ<t
2<t
3.
Described time delay definite value t
Δ, coboundary t
1with coboundary t
2all be embodied in the protection definite value inventory that relay protection producer submits to according to designing requirement.
Accompanying drawing explanation
Fig. 1 is the process flow diagram of the method for evaluating performance that HVDC (High Voltage Direct Current) transmission system 100Hz of the present invention protects;
Fig. 2 is the block diagram of the Performance Appraisal System that HVDC (High Voltage Direct Current) transmission system 100Hz of the present invention protects.
Embodiment
Below in conjunction with the drawings and specific embodiments, content of the present invention is described in further details.
Embodiment:
One, method of evaluating performance principle
In AC-DC interconnecting power network, when fault in ac transmission system, valve fault, valve base electronic device (VBE) fault, valve may be caused to trigger abnormal, in DC current, there will be 100Hz component.The valve caused for VBE triggers abnormal, can be switched eliminate by pole control system.If still have 100Hz component in DC current after pole switching Ore-controlling Role, then can get rid of the possibility of VBE fault, direct current 100Hz protects the action of I section, reduces the power of straight-flow system conveying to utilize the recovery of straight-flow system.If 100Hz component still exists and is greater than protection definite value after attenuating power, then direct current 100Hz protects the action of II section, and locking direct current is to protect the safe and stable operation of DC equipment and AC system.
In Practical Project, cause the reason producing 100Hz component in DC current to have multiple, wherein unbalanced fault causes producing the modal reason of 100Hz component in DC current.During fault in ac transmission system, switch function method is utilized to carry out analysis to the harmonic wave of DC side known, the negative sequence voltage amplitude in proportion relation on DC side 2 subharmonic voltage amplitude and change of current bus:
In formula: U
dc2for DC side 2 subharmonic voltage amplitude; U
ac1-for change of current bus first-harmonic negative sequence voltage amplitude; μ is angle of overlap.
DC side 2 subharmonic current size can be tried to achieve, i.e. 100Hz size of current by formula (1).Therefore, the electromagnetic transients program such as PSCAD/EMTDC can be utilized, simulation calculation can make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act, then the unbalanced fault situation of Short Circuit Calculation Program in Electric Power System to AC network is utilized to carry out traverse scanning, try to achieve the negative sequence voltage of change of current bus, when under certain failure condition, the negative sequence voltage of change of current bus is greater than and utilizes PSCAD/EMTDC to emulate the minimal negative sequence voltage obtained, can think that this AC fault may cause direct current 100Hz protection act, thus the fault in ac transmission system scope affecting direct current 100Hz protection can be determined.
For the fault in above-mentioned fault coverage, the coboundary t exchanging main protection operation time limit can be determined
1and exchange the coboundary t of back-up protection operation time limit
2.In addition, the shortest time t of the DC current 100Hz component that DC equipment can be born can be determined according to the stress limit curve characteristic of DC equipment
3, wherein t
1<t
2<t
3.According to direct current 100Hz relaying configuration principle, its time delay definite value t
Δt must be met
1<t
Δ<t
3, and and t
2magnitude relationship then depend on the logic that cooperatively interacts that alternating current-direct current is protected, if there is t
Δ<t
1<t
2<t
3or t
1<t
2<t
3<t
Δ, then time delay definite value t is proved
Δadjust unreasonable, need to re-start and adjusts.By comparing the time delay definite value t that direct current 100Hz protects
Δwith t
1, t
2, t
3relative size, can to direct current 100Hz protect performance make evaluation.Such as, if t
1<t
2<t
Δ<t
3, then illustrate that the action of direct current 100Hz protection lags behind the action exchanging main protection and back-up protection, and meet the safety requirements of DC equipment, performance is more excellent.The rest may be inferred, the performance evaluation table can protected about direct current 100Hz, as shown in table 1.
The performance evaluation table that table 1 direct current 100Hz protects
Two, the basic procedure of method of evaluating performance
Please refer to Fig. 1, in this HVDC (High Voltage Direct Current) transmission system, the basic step of the appraisal procedure of direct current 100Hz protective value is as follows:
S1, traverse scanning is carried out to the AC network unbalanced fault in the AC-DC interconnecting power network at HVDC (High Voltage Direct Current) transmission system place; determine the AC fault scope affecting direct current 100Hz protection, the performance evaluation that direct current 100Hz protects all is carried out according to this AC fault scope.Determine that the concrete steps of AC fault scope are as follows:
S11, utilize the unbalanced fault situation of Short Circuit Calculation Program in Electric Power System to the AC network of HVDC (High Voltage Direct Current) transmission system to carry out traverse scanning, try to achieve the negative sequence voltage of change of current bus.
S12, utilize the electromagnetic transients program such as PSCAD/EMTDC, simulation calculation can make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act.
S13, when the change of current bus negative sequence voltage under certain failure condition is greater than change of current bus minimal negative sequence voltage; can think that this AC fault may cause direct current 100Hz protection act; the fault that these change of current bus negative sequence voltages are greater than change of current bus minimal negative sequence voltage is formed a set, and this set constitutes the AC fault scope affecting direct current 100Hz and protect.
After S2, really AC fault scope, for the fault within the scope of the AC fault described in step S13, the protection definite value inventory provided according to relay protection producer can determine to exchange the coboundary t of main protection operation time limit
1, exchange the coboundary t of back-up protection operation time limit
2, and the time delay definite value t that direct current 100Hz protects
Δ.In addition, the shortest time t of the DC current 100Hz component that DC equipment can be born can be determined according to the stress limit curve characteristic of each components and parts of HVDC (High Voltage Direct Current) transmission system
3.Coboundary t
1, coboundary t
2with shortest time t
3constitute time boundary.
S3, compare time delay definite value t
Δwith coboundary t
1, coboundary t
2, shortest time t
3relative size, make evaluation to the performance that direct current 100Hz protects, its performance evaluation can four kinds of situations in reference table 1.
Three, the realization of Performance Appraisal System
Please refer to Fig. 2, direct current 100Hz performance evaluation system comprises: emulation module 10, protection module 20 and evaluation module 30.Wherein emulation module 10 mainly realizes utilizing short circuit calculation program to carry out the function of traverse scanning to the unbalanced fault in the AC network that will consider; the negative sequence voltage at the DC converter bus place obtained is compared with the minimal negative sequence voltage of direct current 100Hz protection act that can make utilizing PSCAD/EMTDC to emulate to obtain; thus determine to affect the AC fault scope that direct current 100Hz protects, complete the coboundary t determining to exchange main protection operation time limit within the scope of the AC fault that protection module 20 is mainly determined at emulation module 10
1, exchange the coboundary t of back-up protection operation time limit
2and the shortest time t of DC current 100Hz component that DC equipment can be born
3three time boundaries and time delay definite value t
Δfunction, and evaluation module 30 compares the time delay definite value t determined by protection module 20
Δwith coboundary t
1, coboundary t
2, shortest time t
3relative size, make evaluation to the performance that direct current 100Hz protects, its performance evaluation can four kinds of situations in reference table 1.
Emulation module 10 specifically comprises calculation of short-circuit current module 11, PSCAD/EMTDC emulation module 12 and parsing module 13.Wherein, calculation of short-circuit current module 11 adopts short-circuit current calculation program to carry out the negative sequence voltage of the whole network scanning in the hope of DC converter bus during unbalanced fault to electric network fault; PSCAD/EMTDC emulation module 12 adopts PSCAD/EMTDC Software simulation calculation can make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act; And parsing module 13 is change of current bus minimal negative sequence voltage values that the negative sequence voltage of change of current bus calculation of short-circuit current module 11 obtained and PSCAD/EMTDC emulation module 12 obtain compares the AC fault scope determined to affect direct current 100Hz and protect; the fault specifically change of current bus negative sequence voltage being greater than change of current bus minimal negative sequence voltage forms a set, and namely this set is the AC fault scope affecting direct current 100Hz protection.
Above-listed detailed description is illustrating for possible embodiments of the present invention, and this embodiment is also not used to limit the scope of the claims of the present invention, and the equivalence that all the present invention of disengaging do is implemented or changed, and all should be contained in the scope of the claims of this case.
Claims (6)
1. a method of evaluating performance for HVDC (High Voltage Direct Current) transmission system 100Hz protection, is characterized in that, comprise the following steps:
Step 1, traverse scanning is carried out to the AC network unbalanced fault in the AC-DC interconnecting power network at described HVDC (High Voltage Direct Current) transmission system place, determine the AC fault scope affecting direct current 100Hz protection, this step 1 specifically comprises: step 11, carry out traverse scanning to the unbalanced fault situation of the AC network in the AC-DC interconnecting power network at described HVDC (High Voltage Direct Current) transmission system place, tries to achieve the negative sequence voltage of change of current bus; Step 12, simulation calculation make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act; Step 13, determine to affect the AC fault scope that direct current 100Hz protects, described AC fault scope is the set that change of current bus negative sequence voltage is greater than the AC fault of change of current bus minimal negative sequence voltage;
Step 2, fault for described AC fault scope, determine time boundary, simultaneously and determine the time delay definite value t that direct current 100Hz protects
Δ, described time boundary comprises the coboundary t exchanging main protection operation time limit
1, exchange the coboundary t of back-up protection operation time limit
2, and the shortest time t of DC current 100Hz component that can bear according to the DC equipment that the stress limit curve characteristic of DC equipment is determined
3;
Step 3, compare time delay definite value t
Δwith coboundary t
1, coboundary t
2, shortest time t
3relative size, to direct current 100Hz protect performance make evaluation.
2. the method for evaluating performance of HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 1, is characterized in that, described coboundary t
1< time delay definite value t
Δ< shortest time t
3.
3. the method for evaluating performance of HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 1 and 2, it is characterized in that, the described performance in step 3 comprises first level, second level and third level, and the condition wherein meeting first level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| >|t
Δ-t
3|, the condition meeting second level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| <|t
Δ-t
3|, the condition meeting third level is: t
1<t
Δ<t
2<t
3.
4. a Performance Appraisal System for HVDC (High Voltage Direct Current) transmission system 100Hz protection, it is characterized in that, it comprises:
Emulation module, traverse scanning is carried out for the AC network unbalanced fault in the AC-DC interconnecting power network to described HVDC (High Voltage Direct Current) transmission system place, determine the AC fault scope affecting direct current 100Hz protection, this emulation module specifically comprises: calculation of short-circuit current module, unbalanced fault situation for the AC network in the AC-DC interconnecting power network to described HVDC (High Voltage Direct Current) transmission system place carries out traverse scanning, tries to achieve the negative sequence voltage of change of current bus; PSCAD/EMTDC emulation module, simulation calculation makes the change of current bus minimal negative sequence voltage value of direct current 100Hz protection act; Parsing module, determine the AC fault scope affecting direct current 100Hz protection, described AC fault scope is the set that change of current bus negative sequence voltage is greater than the AC fault of change of current bus minimal negative sequence voltage;
Protection module, for the fault of described AC fault scope, determines time boundary, simultaneously and determine the time delay definite value t that direct current 100Hz protects
Δ, described time boundary comprises the coboundary t exchanging main protection operation time limit
1, exchange the coboundary t of back-up protection operation time limit
2, and the shortest time t of DC current 100Hz component that can bear according to the DC equipment that the stress limit curve characteristic of DC equipment is determined
3;
Evaluation module, for comparing time delay definite value t
Δwith coboundary t
1, coboundary t
2, shortest time t
3relative size, to direct current 100Hz protect performance make evaluation.
5. the Performance Appraisal System of HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 4, is characterized in that, described coboundary t
1< time delay definite value t
Δ< shortest time t
3.
6. the Performance Appraisal System of the HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 4 or 5, it is characterized in that, the described performance in evaluation module comprises first level, second level and third level, and the condition wherein meeting first level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| >|t
Δ-t
3|, the condition meeting second level is: t
1<t
2<t
Δ<t
3and | t
2-t
Δ| <|t
Δ-t
3|, the condition meeting third level is: t
1<t
Δ<t
2<t
3.
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| CN201310225122.6A CN103268429B (en) | 2013-06-07 | 2013-06-07 | Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection |
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| CN201310225122.6A CN103268429B (en) | 2013-06-07 | 2013-06-07 | Performance evaluating method and system for high-voltage direct-current (DC) power transmission system 100Hz protection |
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| CN103268429B true CN103268429B (en) | 2015-04-15 |
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| CN105913333A (en) * | 2016-04-07 | 2016-08-31 | 中国南方电网有限责任公司 | Evaluation method and system in consideration of converter transformer no-load DC 50Hz protection performance |
| CN106356876B (en) * | 2016-09-08 | 2019-01-25 | 国网吉林省电力有限公司延边供电公司 | The negative-sequence current computation model of electric system is injected under high-speed rail AT power supply mode |
| CN110795680B (en) * | 2019-10-16 | 2023-04-18 | 国网湖北省电力有限公司电力科学研究院 | Multi-objective programming based comprehensive evaluation method for state of direct current protection system |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568657C (en) * | 2007-07-20 | 2009-12-09 | 南方电网技术研究中心 | HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method |
| CN103020476A (en) * | 2012-12-28 | 2013-04-03 | 中国南方电网有限责任公司超高压输电公司 | Method and system for assessing relay protection dynamic characteristics of high-voltage direct-current power transmission line |
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2013
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Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN100568657C (en) * | 2007-07-20 | 2009-12-09 | 南方电网技术研究中心 | HVDC (High Voltage Direct Current) transmission system 50Hz and 100Hz protection setting method |
| CN103020476A (en) * | 2012-12-28 | 2013-04-03 | 中国南方电网有限责任公司超高压输电公司 | Method and system for assessing relay protection dynamic characteristics of high-voltage direct-current power transmission line |
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