CN103268429A - 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 PDF

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CN103268429A
CN103268429A CN2013102251226A CN201310225122A CN103268429A CN 103268429 A CN103268429 A CN 103268429A CN 2013102251226 A CN2013102251226 A CN 2013102251226A CN 201310225122 A CN201310225122 A CN 201310225122A CN 103268429 A CN103268429 A CN 103268429A
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protection
direct current
current
transmission system
coboundary
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CN103268429B (en
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赵建宁
王朝硕
蔡泽祥
李晓华
张勇军
杨欢欢
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South China University of Technology SCUT
Super High Transmission Co of China South Electric Net Co Ltd
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South China University of Technology SCUT
Super High Transmission Co of China South Electric Net Co Ltd
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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

A kind of method of evaluating performance and system of HVDC (High Voltage Direct Current) transmission system 100Hz protection
Technical field
The present invention relates to the high voltage power transmission technical field, be specifically related to a kind of method of evaluating performance and system of HVDC (High Voltage Direct Current) transmission system 100Hz protection.
Background technology
Along with development and the application of high voltage dc transmission technology, the alternating current-direct current interconnected network forms gradually, and the AC system relay protection is controlled the coordination of protection and cooperated the safe and stable operation that ensures electrical network significant with straight-flow system.Direct current 100Hz protection is the typical defencive function that alternating current-direct current control protection cooperatively interacts, and the safety of the normal operation of straight-flow system or DC equipment is constituted a threat to arranges in order to prevent from exchanging main protection tripping or malfunctioning switch etc.If fault in ac transmission system can't excise or the mute time is long, might cause direct current 100Hz protection deferred action, thereby reduce the through-put power of straight-flow system, even the locking direct current.The locking of wall scroll or many direct currents will seriously jeopardize the safe and stable operation of electrical network, cause an immeasurable loss.Therefore, the performance of direct current 100Hz protection will produce material impact to the safe and stable operation of electrical network.
At present, mainly concentrate on aspects such as cooperatively interacting of the improvement of protection and alternating current-direct current about the research of direct current 100Hz protection, and for the evaluation of the direct current 100Hz protective value method of complete, the system of none cover still.
Summary of the invention
The object of the present invention is to provide a kind of method of evaluating performance and system of HVDC (High Voltage Direct Current) transmission system 100Hz protection; for the performance evaluation of direct current 100Hz protection is set up relatively uniform a, rounded system; make the performance evaluation systematization of direct current 100Hz protection; and have intuitive and practicality, the performance of assessing direct current 100Hz protection for the design and running personnel provides a kind of advantages of simplicity and high efficiency practical engineering method.
For realizing above purpose, the technical scheme that the present invention takes is:
A kind of method of evaluating performance of HVDC (High Voltage Direct Current) transmission system 100Hz protection may further comprise the steps:
Step 1, the AC network unbalanced fault in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, determine influence the interchange fault coverage that direct current 100Hz protects;
Step 2, at the fault of described interchange fault coverage, determine the time border, simultaneously and determine the time-delay definite value t of direct current 100Hz protection Δ, described time border comprises the coboundary t that exchanges the main protection operation time limit 1, exchange the coboundary t of back-up protection operation time limit 2, and the shortest time t that determines the DC current 100Hz component that DC equipment can be born according to the stress limit curve characteristic of DC equipment 3
Step 3, the definite value t that delays time relatively ΔWith coboundary t 1, coboundary t 2, shortest time t 3Relative size, the performance of direct current 100Hz protection is made evaluation.
Described step 1 specifically may further comprise the steps:
Step 11, the unbalanced fault situation of the AC network in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, try to achieve the negative sequence voltage of change of current bus;
Step 12, set up the detailed model of straight-flow system, simulation calculation makes the change of current bus minimal negative sequence voltage value of direct current 100Hz protection action;
Step 13, definite interchange fault coverage that influences direct current 100Hz protection, described interchange fault coverage is that change of current bus negative sequence voltage is greater than the set of the interchange 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 the step 3 comprises that first rank, second level and the third level are other, wherein satisfies other condition of the first order to be: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ| | t Δ-t 3|, the condition that satisfies second level is: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ|＜| t Δ-t 3|, satisfy other condition of the third level and be: 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 of relay protection producer according to the designing requirement submission.
A kind of performance evaluation system of HVDC (High Voltage Direct Current) transmission system 100Hz protection, it comprises:
Emulation module is used for the AC network unbalanced fault in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, determines to influence the interchange fault coverage of direct current 100Hz protection;
Protection module at the fault of described interchange fault coverage, is determined the time border, also determines the time-delay definite value t of direct current 100Hz protection simultaneously Δ, described time border comprises the coboundary t that exchanges the main protection operation time limit 1, exchange the coboundary t of back-up protection operation time limit 2, and the shortest time t that determines the DC current 100Hz component that DC equipment can be born according to the stress limit curve characteristic of DC equipment 3
Evaluation module is used for the definite value t that relatively delays time ΔWith coboundary t 1, coboundary t 2, shortest time t 3Relative size, the performance of direct current 100Hz protection is made evaluation.
Described emulation module comprises:
The calculation of short-circuit current module is used for the unbalanced fault situation of the AC network in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, tries to achieve the negative sequence voltage of change of current bus;
The PSCAD/EMTDC emulation module, for the detailed model of setting up straight-flow system, simulation calculation makes the change of current bus minimal negative sequence voltage value of direct current 100Hz protection action;
Parsing module, determining influences the interchange fault coverage that direct current 100Hz protects, and described interchange fault coverage is that change of current bus negative sequence voltage is greater than the set of the interchange 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 the evaluation module comprises that first rank, second level and the third level are other, wherein satisfies other condition of the first order to be: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ| | t Δ-t 3|, the condition that satisfies second level is: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ|＜| t Δ-t 3|, satisfy other condition of the third level and be: 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 of relay protection producer according to the designing requirement submission.
Prior art is compared, and the advantage that patent of the present invention has is: the present invention combines the advantage of short-circuit current calculation program and PSCAD/EMTDC simulation calculation program, has realized influencing the quick identification of the interchange fault coverage of direct current 100Hz protection.The present invention propose and set up based on direct current 100Hz protection operation time limit and the shortest time relative size that exchanges the DC current 100Hz component that main protection operation time limit, back-up protection operation time limit and DC equipment can bear; the performance evaluation of protecting for direct current 100Hz provides a kind of advantages of simplicity and high efficiency practical engineering method; for the performance that the operations staff grasps, assessment direct current 100Hz protects; in time improve the performance of 100Hz protection; thereby reduce the incorrect operation of 100Hz protection, ensure that the safe and stable operation of alternating current-direct current interconnected network is significant.
Description of drawings
Fig. 1 is the process flow diagram of the method for evaluating performance of HVDC (High Voltage Direct Current) transmission system 100Hz protection of the present invention;
Fig. 2 is the block diagram of the performance evaluation system of HVDC (High Voltage Direct Current) transmission system 100Hz protection of the present invention.
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 the alternating current-direct current interconnected network, when fault in ac transmission system, valve fault, valve base electronic device (VBE) fault, it is unusual to cause valve to trigger, and the 100Hz component can occur in the DC current.The valve that causes for VBE triggers unusually, can switch to eliminate by utmost point control system.If still have the 100Hz component in the DC current after the pole switching control system, then can get rid of the possibility of VBE fault, the action of direct current 100Hz protection I section reduces the power of straight-flow system conveying to utilize the recovery of straight-flow system.If lower behind the power that the 100Hz component still exists and greater than the protection definite value, then direct current 100Hz protection II section action, the locking direct current is with the safe and stable operation of protection DC equipment and AC system.
In the actual engineering, the reason that causes in the DC current producing the 100Hz component has multiple, and wherein the AC system unbalanced fault is to cause producing in the DC current the modal reason of 100Hz component.During fault in ac transmission system, utilize the switch function method that the harmonic wave of DC side is analyzed as can be known, the proportional relation of negative sequence voltage amplitude on DC side 2 subharmonic voltage amplitudes and the change of current bus:
U dc 2 = 6 3 π U acl - cos μ 2 - - - ( 1 )
In the formula: U Dc2Be DC side 2 subharmonic voltage amplitudes; U Ac1-Be change of current bus first-harmonic negative sequence voltage amplitude; μ is angle of overlap.
Can try to achieve DC side 2 subharmonic current sizes, i.e. 100Hz size of current by formula (1).Therefore; can utilize electromagnetic transient simulation programs such as PSCAD/EMTDC; by setting up the detailed model of straight-flow system; simulation calculation can make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection action; utilize Power System Shortcuts electric current calculation procedure that the unbalanced fault situation of AC network is carried out traverse scanning then; try to achieve the negative sequence voltage of change of current bus; under certain failure condition; the negative sequence voltage of change of current bus is greater than the minimal negative sequence voltage that utilizes PSCAD/EMTDC emulation to obtain; can think that this interchange fault may cause direct current 100Hz protection action, thereby can determine to influence the fault in ac transmission system scope of direct current 100Hz protection.
At the fault in the above-mentioned fault coverage, can determine to exchange the coboundary t of main protection operation time limit 1And the coboundary t that exchanges the back-up protection operation time limit 2In addition, can determine the shortest time t of the DC current 100Hz component that DC equipment can be born according to the stress limit curve characteristic of DC equipment 3, t wherein 1＜t 2＜t 3According to direct current 100Hz protection equipping rules, its time-delay definite value t ΔMust satisfy t 1＜t Δ＜t 3, and and t 2Magnitude relationship then depend on the logic that cooperatively interacts of alternating current-direct current protection, if t Δ＜t 1＜t 2＜t 3Or t 1＜t 2＜t 3＜t Δ, then prove time-delay definite value t ΔAdjust unreasonablely, need adjust again.By comparing the time-delay definite value t of direct current 100Hz protection ΔWith t 1, t 2, t 3Relative size, can make evaluation to the performance of direct current 100Hz protection.For example, if t 1＜t 2＜t Δ＜t 3, illustrate that then the action of direct current 100Hz protection lags behind the action that exchanges main protection and back-up protection, and satisfy the safety requirements of DC equipment that performance is more excellent.The rest may be inferred, can be about the performance evaluation table of direct current 100Hz protection, and as shown in table 1.
The performance evaluation table of table 1 direct current 100Hz protection
Figure BDA00003318247600051
Two, the basic procedure of method of evaluating performance
Please refer to Fig. 1, the basic step of the appraisal procedure of direct current 100Hz protective value is as follows in this HVDC (High Voltage Direct Current) transmission system:
S1, the AC network unbalanced fault in the alternating current-direct current interconnected network at HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning; determine to influence the interchange fault coverage of direct current 100Hz protection, the performance evaluation of direct current 100Hz protection is all carried out according to this interchange fault coverage.The concrete steps of determining the interchange fault coverage are as follows:
S11, utilize Power System Shortcuts electric current calculation procedure that the unbalanced fault situation of the AC network of HVDC (High Voltage Direct Current) transmission system is carried out traverse scanning, try to achieve the negative sequence voltage of change of current bus.
S12, utilize electromagnetic transient simulation program such as PSCAD/EMTDC, by setting up the detailed model of straight-flow system, simulation calculation can make the change of current bus minimal negative sequence voltage value of direct current 100Hz protection action.
S13, when the change of current bus negative sequence voltage under certain failure condition during greater than change of current bus minimal negative sequence voltage; can think that this interchange fault may cause direct current 100Hz protection action; with fault formation one set of these change of current bus negative sequence voltages greater than change of current bus minimal negative sequence voltage, this set has constituted the interchange fault coverage that influences direct current 100Hz protection.
S2, really exchange fault coverage after, at the fault in the interchange fault coverage described in the step S13, the protection definite value inventory that provides 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 of direct current 100Hz protection ΔIn addition, can determine the shortest time t of the DC current 100Hz component that DC equipment can be born according to the stress limit curve characteristic of each components and parts of straight-flow system 3Coboundary t 1, coboundary t 2With shortest time t 3Constituted the time border.
S3, the definite value t that delays time relatively ΔWith coboundary t 1, coboundary t 2, shortest time t 3Relative size, the performance of direct current 100Hz protection is made evaluation, but four kinds of situations in its performance evaluation reference table 1.
Three, the realization of performance evaluation 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 is to realize utilizing the short circuit calculation program unbalanced fault in the AC network that will consider to be carried out the function of traverse scanning; with the negative sequence voltage at the DC converter bus place that obtains and the minimal negative sequence voltage that can make direct current 100Hz protection action that utilizes PSCAD/EMTDC emulation to obtain relatively; thereby determine to influence the interchange fault coverage of direct current 100Hz protection, protection module 20 mainly is to finish the coboundary t that determines to exchange the main protection operation time limit in the interchange fault coverage that emulation module 10 is determined 1, exchange the coboundary t of back-up protection operation time limit 2And the shortest time t of the DC equipment DC current 100Hz component that can bear 3Three time borders and the definite value t that delays time ΔFunction, and the evaluation module 30 time-delay definite value t that to be comparisons determined by protection module 20 ΔWith coboundary t 1, coboundary t 2, shortest time t 3Relative size, the performance of direct current 100Hz protection is made evaluation, but four kinds of situations in its performance evaluation 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 is negative sequence voltages of DC converter bus when adopting short-circuit current calculation program that electric network fault is carried out the whole network scanning in the hope of unbalanced fault; The HVDC (High Voltage Direct Current) transmission system model that PSCAD/EMTDC emulation module 12 adopts PSCAD/EMTDC software to build and comprises detailed control system can make direct current 100Hz protect the change of current bus minimal negative sequence voltage value of action with simulation calculation; And parsing module 13 to be negative sequence voltage and change of current bus minimal negative sequence voltage values that PSCAD/EMTDC emulation module 12 obtains of change of current bus that calculation of short-circuit current module 11 is obtained compare determines influence the fault coverage that exchanges that direct current 100Hz protects; specifically be that change of current bus negative sequence voltage is formed a set greater than the fault of change of current bus minimal negative sequence voltage, this set namely is the interchange fault coverage that influences direct current 100Hz protection.
Above-listed detailed description is at the specifying of possible embodiments of the present invention, and this embodiment is not in order to limiting claim of the present invention, and the equivalence that all the present invention of disengaging do is implemented or change, all should be contained in the claim of this case.

Claims (10)

1. the method for evaluating performance of a HVDC (High Voltage Direct Current) transmission system 100Hz protection is characterized in that, may further comprise the steps:
Step 1, the AC network unbalanced fault in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, determine influence the interchange fault coverage that direct current 100Hz protects;
Step 2, at the fault of described interchange fault coverage, determine the time border, simultaneously and determine the time-delay definite value t of direct current 100Hz protection Δ, described time border comprises the coboundary t that exchanges the main protection operation time limit 1, exchange the coboundary t of back-up protection operation time limit 2, and the shortest time t of the 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, the definite value t that delays time relatively ΔWith coboundary t 1, coboundary t 2, shortest time t 3Relative size, the performance of direct current 100Hz protection is made evaluation.
2. the method for evaluating performance of HVDC (High Voltage Direct Current) transmission system 100Hz according to claim 1 protection is characterized in that described step 1 specifically may further comprise the steps:
Step 11, the unbalanced fault situation of the AC network in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, try to achieve the negative sequence voltage of change of current bus;
Step 12, set up the detailed model of straight-flow system, simulation calculation makes the change of current bus minimal negative sequence voltage value of direct current 100Hz protection action;
Step 13, definite interchange fault coverage that influences direct current 100Hz protection, described interchange fault coverage is that change of current bus negative sequence voltage is greater than the set of the interchange fault of change of current bus minimal negative sequence voltage.
3. 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
4. according to the method for evaluating performance of claim 1 or 3 described HVDC (High Voltage Direct Current) transmission system 100Hz protection, it is characterized in that the described performance in the step 3 comprises that first rank, second level and the third level are other, wherein satisfy other condition of the first order and be: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ| | t Δ-t 3|, the condition that satisfies second level is: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ|＜| t Δ-t 3|, satisfy other condition of the third level and be: t 1＜t Δ＜t 2＜t 3
5. the method for evaluating performance of HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 1 is characterized in that described time-delay definite value t Δ, coboundary t 1With coboundary t 2All be embodied in the protection definite value inventory of relay protection producer according to the designing requirement submission.
6. the performance evaluation system of HVDC (High Voltage Direct Current) transmission system 100Hz protection is characterized in that it comprises:
Emulation module is used for the AC network unbalanced fault in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, determines to influence the interchange fault coverage of direct current 100Hz protection;
Protection module at the fault of described interchange fault coverage, is determined the time border, also determines the time-delay definite value t of direct current 100Hz protection simultaneously Δ, described time border comprises the coboundary t that exchanges the main protection operation time limit 1, exchange the coboundary t of back-up protection operation time limit 2, and the shortest time t of the 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 is used for the definite value t that relatively delays time ΔWith coboundary t 1, coboundary t 2, shortest time t 3Relative size, the performance of direct current 100Hz protection is made evaluation.
7. the performance evaluation system of HVDC (High Voltage Direct Current) transmission system 100Hz according to claim 6 protection is characterized in that described emulation module comprises:
The calculation of short-circuit current module is used for the unbalanced fault situation of the AC network in the alternating current-direct current interconnected network at described HVDC (High Voltage Direct Current) transmission system place is carried out traverse scanning, tries to achieve the negative sequence voltage of change of current bus;
The PSCAD/EMTDC emulation module, for the detailed model of setting up straight-flow system, simulation calculation makes the change of current bus minimal negative sequence voltage value of direct current 100Hz protection action;
Parsing module, determining influences the interchange fault coverage that direct current 100Hz protects, and described interchange fault coverage is that change of current bus negative sequence voltage is greater than the set of the interchange fault of change of current bus minimal negative sequence voltage.
8. the performance evaluation system of HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 6 is characterized in that described coboundary t 1＜time-delay definite value t Δ＜shortest time t 3
9. according to the performance evaluation system of claim 6 or 8 described HVDC (High Voltage Direct Current) transmission system 100Hz protection, it is characterized in that the described performance in the evaluation module comprises that first rank, second level and the third level are other, wherein satisfy other condition of the first order and be: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ| | t Δ-t 3|, the condition that satisfies second level is: t 1＜t 2＜t Δ＜t 3And | t 2-t Δ|＜| t Δ-t 3|, satisfy other condition of the third level and be: t 1＜t Δ＜t 2＜t 3
10. the performance evaluation system of HVDC (High Voltage Direct Current) transmission system 100Hz protection according to claim 6 is characterized in that described time-delay definite value t Δ, coboundary t 1With coboundary t 2All be embodied in the protection definite value inventory of relay protection producer according to the designing requirement submission.
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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
CN106356876A (en) * 2016-09-08 2017-01-25 国网吉林省电力有限公司延边供电公司 Model for calculating negative-sequence current injected into electric power system in high-speed rail AT power supply mode
CN110795680A (en) * 2019-10-16 2020-02-14 国网湖北省电力有限公司电力科学研究院 Multi-target programming-based comprehensive evaluation method for state of direct current protection system

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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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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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Publication number Priority date Publication date Assignee Title
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
CN106356876A (en) * 2016-09-08 2017-01-25 国网吉林省电力有限公司延边供电公司 Model for calculating negative-sequence current injected into electric power system in high-speed rail AT power supply mode
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
CN110795680A (en) * 2019-10-16 2020-02-14 国网湖北省电力有限公司电力科学研究院 Multi-target programming-based comprehensive evaluation method for state of direct current protection system
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

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