CN103675521A - Protection test method for same-tower double-circuit direct current line of high-voltage direct current transmission system - Google Patents
Protection test method for same-tower double-circuit direct current line of high-voltage direct current transmission system Download PDFInfo
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Abstract
The invention discloses a protection test method for a same-tower double-circuit direct current line of a high-voltage direct current transmission system, which comprises the following steps of: 1) establishing an RTDS model of the same-tower four-pole direct-current line; 2) and setting the fault of the same-tower double-circuit direct current line, and detecting the protection function of the direct current line. The invention establishes a closed-loop test system by connecting an actual control protection platform through the RTDS, runs a same-tower double-circuit direct-current transmission system model, triggers various faults related to direct-current line protection and carries out direct-current line protection test. By adopting the technical scheme of the invention, the same-tower double-circuit direct current line of the actual high-voltage direct current transmission system can be accurately modeled, and the protection of the same-tower double-circuit direct current line can be comprehensively tested.
Description
Technical field
The present invention relates to DC power transmission line simulation modeling and protection field tests thereof; be specifically related to the innovative approach of a kind of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line modeling and protection test thereof, belong to the innovative technology of the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line.
Background technology
For saving transmission of electricity corridor, the common-tower double-return DC transmission engineering of UHV (ultra-high voltage), long distance power transmission enters the engineering application stage, and in conventional DC engineering, bipolar line model cannot adapt to the modeling of newly built construction DC line and test request thereof.For realizing application RTDS Real Time Digital Simulator, the DC control protection of this type of engineering is carried out to closed loop test; need to innovate modeling to common-tower double-return DC line; also to fault be set in conjunction with common-tower double-return DC line feature novelty in addition, DC line protection is innovated to test.
Summary of the invention
The present invention is directed to Practical Project emulation testing needs; a kind of protection method of testing that is applicable to the HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line of common-tower double-return DC transmission engineering is provided; the present invention guarantees science, the validity of test, meets the needs of engineering application.The present invention can carry out Accurate Model to the common-tower double-return DC line of actual high-voltage DC transmission system, and the protection of common-tower double-return DC line is comprehensively tested.
Technical scheme of the present invention is: the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line of the present invention, comprises the steps:
1) set up the RTDS model with tower four utmost point DC line;
2) fault of common-tower double-return DC line is set, and detects the defencive function of DC line.
Above-mentioned steps 1), in, foundation with the method for the RTDS model of tower four utmost point DC line is: according to the parameter of the line construction of actual common-tower double-return DC transmission engineering, length, build real-time simulation model.
Above-mentioned steps 2) in, the fault of common-tower double-return DC line is set, and the method that detects the defencive function of DC line is: according to direct current protecting algorithm and logic, at difference, various faults are set, and complete detection DC line protection function.
Above-mentioned steps 1) in; with four utmost point DC line of the RTDS model of tower four utmost point DC line by with returning homonymy polarity cross-distribution; and according to actual common-tower double-return DC line, physical parameter is set; this model access current conversion station RTDS model forms after complete common-tower double-return direct current transportation realistic model; form closed loop test system with working control protection system; the various faults that emulation various DC Line Faults, especially DC line are relevant.
The above-mentioned physical parameter according to actual common-tower double-return DC line physical parameter setting includes length, the division number on every polar curve road, every diameter of wire, unit resistance, apart from level ground distance, apart from tower center line distance from, sag distance, the unit resistance of built on stilts ground wire, apart from level ground distance, apart from tower center line distance from arc hammer distance.
6, the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line according to claim 1, above-mentioned steps 2) in, the fault of common-tower double-return DC line is set, and detecting the defencive function of DC line, the fault of setting includes simulation thunderbolt characteristic failures, earth fault and the multiple fault of multi-line; And the various defencive functions of full test common-tower double-return DC line.
The present invention is directed to Practical Project emulation testing needs; a kind of protection method of testing that is applicable to the HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line of common-tower double-return DC transmission engineering is provided; the present invention connects working control protecting platform by RTDS and sets up closed loop test system; operation common-tower double-return DC transmission system model (comprising that common-tower double-return DC line model, transverter and the change of current become built-up pattern, alternating current-direct current filter model etc.); trigger the various faults that DC line protection is relevant, carry out DC line protection test.The present invention guarantees science, the validity of test, meets the needs of engineering application.The present invention a kind ofly can carry out Accurate Model to the common-tower double-return DC line of actual high-voltage DC transmission system, the protection of common-tower double-return DC line is carried out to the protection method of testing of the HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line of full test.
Accompanying drawing explanation
Fig. 1 is common-tower double-return DC line model modeling and fault setting procedure figure;
Fig. 2 is common-tower double-return DC line protection test flow chart.
Embodiment
For realizing common-tower double-return DC transmission engineering real-time simulation test, need to set up corresponding direct current RTDS model and work out testing program.The invention process technical scheme main realized to principle, embodiment below and the beneficial effect that should be able to reach is at length set forth.
The protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line of the present invention, comprises the steps:
1) set up the RTDS model with tower four utmost point DC line;
2) fault of common-tower double-return DC line is set, and detects the defencive function of DC line.
Above-mentioned steps 1) in, foundation is four polar curve road segmentation modelings with the method for the RTDS model of tower four utmost point DC line, and concrete grammar is:
(1) collect with tower four utmost point DC line parameters, wherein parameter comprises that electric pressure, length, polarity distributions, wire division number, every kilometer of solid conductor resistance, solid conductor diameter and homopolarity bundle spacing are from, each polar conductor horizontal range and vertical range, wire maximum sag distance.
(2) collect the built on stilts ground wire parameter of DC line, wherein parameter comprises every kilometer of resistance, horizontal range and vertical range, maximum sag distance etc.
(3) use the phase region frequency varying model based on theory of travelling wave, total track length is divided into some sections (for example two sections).
(4) according to every polar curve road physical parameter, physical arrangement and number philosophy, complete the setting of 4 utmost point DC line parameters.
(5) compiling circuit model.
(6) will compile successful segmentation with tower four utmost point DC line models, according to unified nomenclature principle, access DC Model in corresponding RTDS RACK.
Above-mentioned steps 2), in, the method for common-tower double-return DC line fault setting is:
(7) Mei Ji DC line converting plant leading-out terminal arranges respectively metal earth fault and through transition resistance eutral grounding fault, transition resistance is adjustable, scope is 20 Ω to 300 Ω, instantaneous voltage source or current source in addition superpose, voltage magnitude scope 300kV to 600kV, current amplitude scope 1000A to 1800A, duration 0.3ms to 0.5ms.
(8) at every utmost point DC line Inverter Station leading-out terminal, metal earth fault is set respectively and through transition resistance eutral grounding fault, transition resistance is adjustable, scope is 20 Ω to 300 Ω, superpose in addition instantaneous voltage source or current source, duration 0.3ms to 0.5ms.Voltage magnitude scope 300kV to 600kV, current amplitude scope 1000A to 1800A, duration 0.3ms to 0.5ms.
(9) at every utmost point DC line mid point, metal earth fault is set respectively and through transition resistance eutral grounding fault, transition resistance is adjustable, scope is 20 Ω to 300 Ω, superpose in addition instantaneous voltage source or current source, duration 0.3ms to 0.5ms.Voltage magnitude scope 300kV to 600kV, current amplitude scope 1000A to 1800A, duration 0.3ms to 0.5ms.
(10) at DC line converting plant leading-out terminal, any the two poles of the earth metallic short circuit fault, any the two poles of the earth are set respectively through transition resistive short fault, transition resistance is adjustable, and scope is 20 Ω to 300 Ω.
(11) at DC line Inverter Station leading-out terminal, any the two poles of the earth metallic short circuit fault, any the two poles of the earth are set respectively through transition resistive short fault, transition resistance is adjustable, and scope is 20 Ω to 300 Ω.
(12) at DC line mid point, any the two poles of the earth metallic short circuit fault, any the two poles of the earth are set respectively through transition resistive short fault, transition resistance is adjustable, and scope is 20 Ω to 300 Ω.
(13) between each utmost point transverter high-pressure side outlet of converting plant and smoothing reactor, metallic earthing fault outside DC line district is set respectively.
(14) between each utmost point transverter high-pressure side outlet of Inverter Station and smoothing reactor, metallic earthing fault outside DC line district is set respectively.
Above-mentioned steps 2) in, detect the defencive function of DC line, concrete method of testing is:
(1) confirm all direct current protectings especially DC line protection all drop into, relevant definite value correctly arranges.
(2), according to system equivalent parameter, by exchanging equivalent power supply in RTDS model, by the large mode of equivalence, arrange.
(3) by DC operation to monopolar ground circuit operation mode and DC power, be minimum value, be generally 0.1p.u..
(4) at this utmost point DC line rectification side leading-out terminal, inversion side leading-out terminal and mid point etc., locate to simulate respectively metallic earthing fault.
(5) at this utmost point DC line rectification side leading-out terminal, inversion side leading-out terminal and mid point etc., locate to simulate respectively through transition resistance eutral grounding fault.
(6) at locate to superpose respectively instantaneous voltage source or current sources such as this utmost point DC line rectification side leading-out terminal, inversion side leading-out terminal and mid points, simulation thunderbolt characteristic failures.
(7) between Gai Ji converting plant, the outlet of Inverter Station transverter high-pressure side and smoothing reactor, simulate respectively metallic earthing fault, i.e. DC line protection external area error.
(8) after DC operation to monopolar metallic return mode and DC power is minimum value, other conditions are constant, reform (4)～(7).
(9) this utmost point DC power is adjusted to after ratings, keeps the metallic return mode of connection, other conditions are constant, reform (4)～(7).
(10) this utmost point is operated to Ground return mode by metallic return mode, keeps rated power level constant, reform (4)～(7).
(11) by certain time DC operation to bipolar fashion and DC power, be minimum value, a utmost point (4)～(7) of reforming therein.
(12) keep the mode of connection constant, DC power is adjusted to ratings, therein a utmost point (4)～(7) of reforming.
(13) twice direct current heteropolarity utmost points (as returned the I utmost point 2 and returning the II utmost point 1) are operated to respectively to Ground return mode, DC power is minimum value, therein a utmost point (4)～(7) of reforming.
(14) keep the mode of connection constant, DC power is adjusted into ratings, therein a utmost point (4)～(7) of reforming.
(15) this two heteropolarities utmost point is operated to respectively to metallic return mode, DC power maintains ratings, therein a utmost point (4)～(7) of reforming.
(16) keep the mode of connection constant, DC power is adjusted into minimum value, therein a utmost point (4)～(7) of reforming.
(17) twice direct current same polarity utmost points (as returned the I utmost point 1 and returning the II utmost point 1) are operated to respectively to Ground return mode, DC power is minimum value, therein a utmost point (4)～(7) of reforming.
(18) twice direct current same polarity utmost points (as returned the I utmost point 1 and returning the II utmost point 1) are operated to respectively to metallic return mode, DC power remains on minimum value, therein a utmost point (4)～(7) of reforming.
(19) keep the mode of connection constant, DC power is adjusted into ratings, therein a utmost point (4)～(7) of reforming.
(20) by a DC operation to bipolar fashion, another time DC operation be to monopolar ground circuit operation mode, (as bipolar in returned I, to return the II utmost point 1 one pole the earth), DC power is minimum value, respectively in each utmost point (4)～(7) of reforming.
(21) keep the mode of connection and power constant, in converting plant leading-out terminal, Inverter Station leading-out terminal, midpoint, simulate respectively two DC line metallic short circuits of same polarity and through transition resistive short.
(22) keep the mode of connection and power constant, in converting plant leading-out terminal, Inverter Station leading-out terminal, midpoint, simulate respectively two DC line metallic short circuits of heteropolarity and through transition resistive short.
(23) keep the mode of connection and power constant, select two places in DC line mid point, rectification side leading-out terminal, inversion side leading-out terminal, simulation two same polarity utmost point difference simultaneous ground faults.
(24) keep the mode of connection and power constant, select two places in DC line mid point, rectification side leading-out terminal, inversion side leading-out terminal, simulation two heteropolarity utmost point difference simultaneous ground faults.
(25) keep the mode of connection and power constant, select two places in DC line mid point, rectification side leading-out terminal, inversion side leading-out terminal, simulation the two poles of the earth difference be separated by 5ms, be separated by 10 minutes, the 15 minutes earth fault in succession of being separated by.
(26) keep the mode of connection constant, DC power is adjusted into ratings, respectively in each utmost point (4)～(7) of reforming.
(27) repeat steps (21)～(25).
(28) by DC operation to bipolar, another DC operation is to one pole metal, (as bipolar in returned I, to return the II utmost point 1 one pole metal), DC power is minimum value, respectively in each utmost point (4)～(7) of reforming; Reform afterwards (27).
(29) keep the mode of connection constant, DC power is adjusted into ratings, respectively in each utmost point (4)～(7) of reforming; Reform afterwards (27).
(30) twice direct currents are all operated to bipolar fashion, DC power is minimum value, therein a utmost point (4)～(7) of reforming; Reform afterwards (27).
(32) keep the mode of connection constant, DC power is adjusted into ratings, therein a utmost point (4)～(7) of reforming; Reform afterwards (28).
(33), according to system equivalent parameter, reform (3)～(32) are set by equivalent little mode by exchanging equivalent power supply in DC Model.
(34) exit traveling-wave protection, 27du/dt protection, all faults through transition resistance in reform (3)～(33).
Claims (6)
1. a protection method of testing for HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line, is characterized in that comprising the steps:
1) set up the RTDS model with tower four utmost point DC line;
2) fault of common-tower double-return DC line is set, and detects the defencive function of DC line.
2. the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line according to claim 1; it is characterized in that above-mentioned steps 1) in, foundation with the method for the RTDS model of tower four utmost point DC line is: according to the parameter of the line construction of actual common-tower double-return DC transmission engineering, length, build real-time simulation model.
3. the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line according to claim 1; it is characterized in that above-mentioned steps 2) in; the fault of common-tower double-return DC line is set; and the method that detects the defencive function of DC line is: according to direct current protecting algorithm and logic; at difference, various faults are set, and complete detection DC line protection function.
4. the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line according to claim 1; it is characterized in that above-mentioned steps 1) in; with four utmost point DC line of the RTDS model of tower four utmost point DC line by with returning homonymy polarity cross-distribution; and according to actual common-tower double-return DC line, physical parameter is set; this model access current conversion station RTDS model forms after complete common-tower double-return direct current transportation realistic model; form closed loop test system with working control protection system; the various faults that emulation various DC Line Faults, especially DC line are relevant.
5. the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line according to claim 4; it is characterized in that the above-mentioned physical parameter according to actual common-tower double-return DC line physical parameter setting includes length, the division number on every polar curve road; every diameter of wire, unit resistance; apart from level ground distance, apart from tower center line distance from, sag distance, the unit resistance of built on stilts ground wire, apart from level ground distance, apart from tower center line distance from arc hammer distance.
6. the protection method of testing of HVDC (High Voltage Direct Current) transmission system common-tower double-return DC line according to claim 1, above-mentioned steps 2) in, the fault of common-tower double-return DC line is set, and detecting the defencive function of DC line, the fault of setting includes simulation thunderbolt characteristic failures, earth fault and the multiple fault of multi-line; And the various defencive functions of full test common-tower double-return DC line.
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| CN106972464A (en) * | 2017-03-31 | 2017-07-21 | 广州供电局有限公司 | Protective value assessment system and method on a kind of transmission line with four-circuit on single tower |
| CN110601165A (en) * | 2019-09-10 | 2019-12-20 | 中国电力工程顾问集团中南电力设计院有限公司 | DC line reconstructed by same-tower double-circuit AC line and reconstruction method thereof |
| CN113919183A (en) * | 2021-12-13 | 2022-01-11 | 国网江西省电力有限公司电力科学研究院 | RTDS-based method and device for simulating lightning stroke fault response characteristics of direct current control protection system |
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| CN104659762A (en) * | 2014-11-14 | 2015-05-27 | 中国南方电网有限责任公司 | Optimal stability control method of cascading failures for double circuit lines |
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| CN110601165A (en) * | 2019-09-10 | 2019-12-20 | 中国电力工程顾问集团中南电力设计院有限公司 | DC line reconstructed by same-tower double-circuit AC line and reconstruction method thereof |
| CN113919183A (en) * | 2021-12-13 | 2022-01-11 | 国网江西省电力有限公司电力科学研究院 | RTDS-based method and device for simulating lightning stroke fault response characteristics of direct current control protection system |
| CN113919183B (en) * | 2021-12-13 | 2022-04-12 | 国网江西省电力有限公司电力科学研究院 | RTDS-based method and device for simulating lightning stroke fault response characteristics of direct current control protection system |
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