CN102522733A - HVDC power-transmission whole-line speed protection method by using direct-current filter current - Google Patents
HVDC power-transmission whole-line speed protection method by using direct-current filter current Download PDFInfo
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- CN102522733A CN102522733A CN2011104182081A CN201110418208A CN102522733A CN 102522733 A CN102522733 A CN 102522733A CN 2011104182081 A CN2011104182081 A CN 2011104182081A CN 201110418208 A CN201110418208 A CN 201110418208A CN 102522733 A CN102522733 A CN 102522733A
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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
- H02H7/22—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 for distribution gear, e.g. bus-bar systems; for switching devices
- H02H7/226—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 for distribution gear, e.g. bus-bar systems; for switching devices for wires or cables, e.g. heating wires
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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
- H02H7/268—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 for dc systems
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
- G01R31/08—Locating faults in cables, transmission lines, or networks
- G01R31/081—Locating faults in cables, transmission lines, or networks according to type of conductors
- G01R31/085—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution lines, e.g. overhead
Abstract
The invention relates to a power-system direct current power transmission line relay protection field and especially relates to a single-terminal electric-quantity whole-line quick action protection method which can be used to identify faults in and out of an HVDC transmission line area. An amplitude of a specific frequency component in a single-terminal direct-current filter branch is used to realize discrimination of the faults in and out of the area. The method of the invention is used to protect a single-terminal whole-line quick action in the direct current power transmission line of the power system. The protection can be achieved only by using the single-terminal electric quantity. The method has a low requirement to a sampling frequency. An algorithm is simple. Sensitivity is high. The method can be realized during engineering. The action speed is fast, selectivity is good and reliability is high. A theory is completed and is easy to be adjusted. The protection method of the invention can replace current traveling-wave protection which is taken as the main protection of the direct current power transmission line. And the method is especially suitable for realizing the whole-line quick action protection of the ultra/super HVDC power transmission line by using the single-terminal electric quantity.
Description
Technical field
The invention belongs to the relay protection of power system technical field, specifically, is a kind of HVDC transmission line quick-action completely guard method that utilizes the DC filter electric current.
Background technology
HVDC (HVDC) transmission of electricity is big with its through-put power; Advantages such as the circuit cost is low, and control performance is good are occupied more and more important position in remote, high-power transmission of electricity; World developed country is all its main means as big capacity, long distance electricity and asynchronous networking; Also become the focus of power construction because of " transferring electricity from the west to the east, north and south supplies mutually, national network " in China.Since direct current transportation was adopted in Ge Zhou Ba to Shanghai in 1989, China's DC transmission engineering quantity came out at the top in the world.
The general interconnection as big area networking of HVDC transmission line, its fail safe and reliability not only are related to the stability of native system, and will directly influence the stable operation of connected regional power grid even whole electrical network.Because DC line is long, the probability that breaks down is high, and the operation level that therefore improves the DC power transmission line relaying protection is significant to the fail safe and the reliability that guarantee DC transmission system.And in a sense, the performance indicators of DC power transmission line main protection the operation level of direct current system relaying protection.
At present, operating DC line many with traveling-wave protection as main protection.Traveling-wave protection has the advantage of quick action, but in order effectively to utilize voltage, change in current rate, traveling-wave protection requires high to sample rate.In order to guarantee the selectivity of protection under the thunder and lightning disturbed condition, the compelled sensitivity that reduces protection has also increased the complexity of protecting criterion.Research both at home and abroad shows: traveling-wave protection not only is subject to the influence of thunder and lightning and interference, and can not discern high resistive fault, is prone to malfunction, and the reliability of action is low.In sum, the DC transmission engineering that puts into operation both at home and abroad, the main protection ubiquity of its DC power transmission line theoretical incomplete, do not have the blanket principle of adjusting, the problems such as only depending on simulation result of adjusting.Thereby it is high to have caused the DC line protective relaying device that sample rate is required, and exists poor selectivity, sensitivity is low, reliability is not high problem.
For the quick-action completely of the single-end electrical quantity described in the patent 201110209681.9 protection, it utilizes, and the electric parameters signal constitutes protection in the DC power transmission line side senser.Because the circuit running current is big, the reacting condition of electric parameters is insensitive during to fault, makes that protection sensitivity is low.
Summary of the invention
The object of the present invention is to provide a kind of highly sensitive, selectivity good, the single-end electrical quantity quick-action completely guard method of quick action, HVDC transmission line district internal and external fault that reliability is high.Thereby for DC power transmission line provides relaying protection.
For achieving the above object; The present invention provides a kind of single-end electrical quantity quick-action completely guard method of discerning HVDC transmission line district internal and external fault, and it utilizes the amplitude of CF electric parameters in the single-ended DC filter branch road to realize the differentiation of troubles inside the sample space, external area error.
A kind of HVDC transmission line quick-action completely guard method that utilizes the DC filter electric current, ultra-high-tension power transmission line comprises the current conversion station at DC power transmission line and two ends thereof, current conversion station comprises direct current filter loop joint; Step 1 obtains the electric parameters signal from the instrument transformer of this utmost point DC filter link; Step 2 is calculated the current break in the unit interval according to the electric current in the above-mentioned signal, during greater than the starting threshold value, and execution in step three; Step 3 utilizes digital filter that the electric parameters signal that from step 1, obtains is carried out filtering, obtains the CF electric parameters;
Said current conversion station comprises the DC filtering link, and said DC filtering link comprises smoothing reactor and DC filter, DC filter are provided with said instrument transformer; When the setting threshold value in the said step 5 by the said smoothing reactor outside metallicity fault took place, the sensitive electric parameters of instrument transformer was adjusted, and its value is confirmed by smoothing reactor parameter, DC filter parameter and line parameter circuit value.
The amplitude of the CF electric parameters that calculates by step 4 when said setting threshold value greater than the smoothing reactor outside the most serious external area error takes place, and the amplitude of the CF electric parameters that the most slightly obtains by step 4 during troubles inside the sample space less than the generation of DC transmission line trackside of this settings threshold value.
Electric parameters signal in the said step 3 is a current signal, and the CF in the said step 3 is CF point or CF section, and said CF point is the tuned frequency point of DC filter, is 12,24 or 36 times of industrial frequency AC frequency; Said CF section is more than the 300Hz.Said CF section is 400Hz～550Hz.
Said CF obtains according to following method:
The minimum input impedance of DC filter when obtaining the circuit external area error, and obtain the impedance magnitude of this minimum input impedance under different frequency, the electric current that flows through DC filter branch road shunt in the case is maximum;
The maximum input impedance of DC filter when obtaining the line areas internal fault, and obtain the impedance magnitude of this maximum input impedance under different frequency, the electric current that flows through DC filter branch road instrument transformer in this case is minimum;
The impedance magnitude of the above-mentioned minimum input impedance that obtains and the impedance magnitude of maximum input impedance are compared, the impedance magnitude of minimum input impedance than the impedance magnitude of maximum input impedance big more than 10 times or more than 100 times pairing frequency or frequency band be CF point or CF band.
Method according to claim 2 is characterized in that: the method for the CF electric parameters amplitude that calculation of filtered obtains in the said step 4 comprises fourier algorithm, least square method, integration method.
The present invention has following beneficial effect:
1, this method adopts the raw information of single-end electrical quantity as criterion, and the electric parameters that only need extract single-ended CF point or the CF band of DC power transmission line can realize distinguishing the differentiation of internal and external fault.Compare with the protection that utilizes the both-end electric parameters, what do not receive communication port influences high, the quick action of reliability;
DC filtering link impedance operator difference when 2, the present invention is based on DC power transmission line district internal and external fault proposes the single-ended amount guard method of DC power transmission line, and the relaying protection theory of structure is complete, selectivity good, highly sensitive;
3, compare with existing method, the inventive method to the sample frequency of protective device require low, be easy to realize.Overcome existing DC power transmission line traveling-wave protection to sample frequency require height, poor selectivity, problem such as sensitivity is low, reliability is not high.And further improved and utilized electric parameters signal in the DC transmission line trackside instrument transformer to constitute the reliable in action property and the sensitivity of single-ended amount quick-action completely protection, reduced hardware cost.Can replace the main protection of existing traveling-wave protection, be particularly suitable for utilizing single-end electrical quantity to realize all fronts quick-action protection of spy/super high voltage direct current electricity transmission line as DC power transmission line;
4, the utilization characteristic frequency signal relevant with smoothing reactor and DC filter carries out Fault Identification; Because these signal frequencies are relatively low; And have amplitude height, characteristics that energy is big, therefore utilize the relaying protection of this frequency signal will have, high reliability features low sample rate.
Description of drawings
Fig. 1 is the bipolar direct current transmission system structural representation;
Fig. 2 is the smoothing reactor of bipolar direct current transmission system shown in Figure 1 and the circuit diagram of the DC filtering link that DC filter constitutes;
When being circuit external area error DC filter branch road, Fig. 3 looks minimum the input impedance of DC filtering link sideways from current conversion station;
The DC filter branch road was looked maximum the input impedance of DC filtering link sideways when Fig. 4 was the line areas internal fault from DC line;
Fig. 5 is minimum input impedance and the frequency characteristic of the maximum input impedance among Fig. 4 among Fig. 3;
Fig. 6 is the analogous diagram according to CF section current judgement troubles inside the sample space (DC power transmission line mid point metallic earthing);
Fig. 7 is the analogous diagram according to CF point current judgement troubles inside the sample space (DC power transmission line mid point metallic earthing);
Fig. 8 is the analogous diagram according to CF section current judgement troubles inside the sample space (the DC power transmission line mid point is through 500 ohm of transition resistance ground connection);
Fig. 9 is the analogous diagram according to CF point current judgement troubles inside the sample space (the DC power transmission line mid point is through 500 ohm of transition resistance ground connection);
Figure 10 is the analogous diagram according to CF section current judgement external area error (rectification side generation metallic earthing);
Figure 11 is the analogous diagram according to CF point current judgement external area error (rectification side generation metallic earthing);
Figure 12 is the analogous diagram according to CF section current judgement external area error (inversion side generation metallic earthing);
Figure 13 is the analogous diagram according to CF point current judgement external area error (inversion side generation metallic earthing);
Embodiment
Please with reference to Fig. 1, Fig. 1 is the structure diagram of bipolar direct current transmission system.DC transmission system is made up of current conversion station 1,2 and DC power transmission line 3. Current conversion station 1,2 all is equiped with converter valve 4.F among the figure
1, f
2, f
3Be the fault point, wherein f
1Occur on the DC power transmission line 3, be called the troubles inside the sample space point; f
2And f
3The current conversion station side takes place, and is called the external area error point.u
Jp, i
JpBe respectively the anodal direct voltage and the direct current of current conversion station 1; u
Jn, i
JnBe respectively the negative pole direct voltage and the direct current of current conversion station 1; u
Kp, i
KpBe respectively the anodal direct voltage and the direct current of current conversion station 2; u
Kn, i
KnBe respectively the negative pole direct voltage and the direct current of current conversion station 2.Dotted portion is the filtering link 5 that smoothing reactor and DC filter are formed among Fig. 1.This DC transmission system also comprises the control protection system 6 that is arranged on DC power transmission line 3 both sides; This control protection system 6 can obtain the digital signal of local terminal utmost point electric parameters through the A/D converter (not shown) that wherein is provided with; The line of numbers of going forward side by side Signal Processing, differentiation realize defencive function.
Fig. 2 is the circuit diagram of filtering link 5.Filtering link 5 is made up of smoothing reactor 51 and DC filter 52.DC filter 52 is provided with instrument transformer 8.Filtering link 5 is connected with voltage divider 12 through shunt 11 with the converter valve 4 of current conversion station 1.U among the figure
1, i
1Be respectively the voltage and current of current conversion station 1 converter valve 4 side DC filter branch roads, u
2, i
2It is respectively the voltage and current of DC power transmission line 3 sides.Can find out from the filtering link 5 of Fig. 2: when breaking down outside DC power transmission line 3 districts, because the retardation of smoothing reactor 51, the higher-frequency current component that makes the instrument transformer 8 of DC filter branch road experience is very little; When breaking down in DC power transmission line 3 districts; Owing to there is not the barrier effect of smoothing reactor 51; The higher-frequency current component that the instrument transformer 8 of DC filter branch road is experienced is very big; This characteristic can be used for distinguishing DC power transmission line district internal and external fault, and has higher sensitivity and selectivity.
In order to make full use of this otherness that filtering link 5 is shown in DC power transmission line 3 districts, during external area error; Structure has definitely optionally Principles of Relay Protection; Need to analyze in which frequency band, the maximum current that instrument transformer 8 is experienced during DC power transmission line 3 external area errors also is far smaller than the minimum short circuit current of DC power transmission line 3 troubles inside the sample spaces.Fig. 3 has provided the minimum input impedance Z of DC filter 52 when external area error takes place for this reason
In, the electric current that the instrument transformer 8 of DC filter branch road is experienced when minimum input impedance is maximum.The maximum input impedance Z of DC filter 52 when Fig. 4 has provided the line areas internal fault
In, the electric current that DC filter branch road instrument transformer 8 is experienced under this situation is minimum.The impedance frequency characteristic that Fig. 5 has provided Fig. 3 and Fig. 4 circuit under the DC filter parameter of certain DC engineering relatively.
Can know when the DC line external area error, to have retardation by 51 pairs of high frequencies of smoothing reactor from the impedance frequency characteristic of Fig. 5, the high more blockage effect of frequency is obvious more, and promptly the higher component of frequency is difficult to outside the DC line district, pass on the DC filter branch road; And when DC power transmission line troubles inside the sample space situation; The impedance operator of the filtering link 5 at circuit two ends has band general character matter; Wherein the signal to 600Hz, 1200Hz and three frequencies of 1800Hz does not have retardation; That is to say that the electric current under these three frequencies will can not blocked, the amplitude of these three frequency components that DC filter 52 is experienced can be bigger.Contrast can know, impedance operator in above three impedances that frequency showed much larger than 1k Ω.That is to say, under the external area error situation, the DC filter branch road at the current component of above three frequencies much smaller than the troubles inside the sample space situation.Therefore, can distinguish DC power transmission line district internal and external fault according to the content of above three frequency components.
It can also be seen that from Fig. 5 for the above frequency signal of 300Hz, the retardance ability of Fig. 4 then exceeds more than 100 times than Fig. 6.
When considering DC power transmission line 3 troubles inside the sample spaces, DC filter 52 tuned frequencies are minimum to the retardation of signal, and the current component of tuned frequency point will be bigger, can distinguish the differentiation of internal and external fault reliably.The energy of considering fault-signal mainly concentrates on low-frequency band; And the distribution character of transmission line parameter and frequency dependent characteristic are to factors such as the filtering of high-frequency signal and retardation increases; High fdrequency component content is less in fact during transmission line malfunction, and this conclusion has also obtained confirmation from the record ripple of direct current transmission line fault.Therefore; Though preceding surface analysis the above signal of 300Hz all have the separating capacity of district's internal and external fault; But consider from the angle of reliability and the angle of signal handling capacity and hardware unit relation; Utilize the above frequency component medium and low frequency of 300Hz band to carry out fault distinguishing, with the reduction hardware cost more significant technique effect is arranged improving reliable in action property.
Embodiment 1:
The single-end electrical quantity quick-action completely guard method of identification HVDC transmission line district internal and external fault mainly utilizes the amplitude realization troubles inside the sample space of single-ended DC filter branch road CF electric parameters, the differentiation of external area error.
Carry out according to following steps:
1) in current conversion station, from the instrument transformer 8 of this utmost point DC filter 52 branch roads, obtains this electrode current signal;
2) according to the current break in the said current signal unit of account time, during greater than the starting threshold value, system breaks down;
3) utilize the digital filter in the control protection system 6 that this electrode current that from step 1), obtains is carried out filtering, obtain the CF magnitude of current;
4) amplitude of the CF electric current that obtains of calculation of filtered;
5) compare the amplitude of CF electric current and the size of setting threshold value, when greater than the setting threshold value, be judged to be external area error; When less than the setting threshold value, be judged to be troubles inside the sample space; Realize DC power transmission line troubles inside the sample space, external area error differentiation.
Use the current break in this utmost point DC filter branch current unit of account time according to formula (1), start protection during greater than the starting threshold value, the formula left side is to start threshold value for the sudden change of DC filter branch current, the right;
Wherein: m=1,2 ..., N; N is a sampling number in the unit interval, the pairing sampling number of starting element data window just, the desirable 5～10ms of data window length; Current break Δ i=i-I
n, i is this extremely current current sampling data, I
nBe normal running current value before this utmost point fault; k
rBe safety factor, k
r>=1, general desirable 1.2～1.5; I
Set=0.1I
n, I
nRated current for DC power transmission line.
The CF that step 4) adopted comprises CF section and CF point.Said CF point is 12,24 or 36 times (being 600Hz, 1200Hz and 1800Hz) of industrial frequency AC frequency for the tuned frequency point of DC filter; Said CF section is more than the 300Hz.
If consider from the angle of reliability and the angle of signal handling capacity and hardware unit relation; Utilize the above frequency component medium and low frequency of 300Hz band to carry out fault distinguishing; With the reduction hardware cost more significant technique effect is arranged to improving reliable in action property, then adopting CF section 400Hz～550Hz is preferred version.
The method of the CF current amplitude that calculation of filtered obtains in the step 4) comprises that fourier algorithm, least square method, integration method and other ask for the algorithm of signal amplitude.
The sensitive electric parameters of DC filter branch road instrument transformer was adjusted when the setting threshold value described in the step 5) by the smoothing reactor outside (away from the ac line trackside) the metallicity fault took place, and its value is confirmed by smoothing reactor parameter, DC filter parameter and line parameter circuit value.The amplitude of the CF electric current that calculates by step 4) when said setting threshold value greater than the smoothing reactor outside the most serious external area error (for example metallic earthing) takes place, and the amplitude of the CF electric current that the most slightly obtains by step 4) during troubles inside the sample space (for example 500 ohm of transition resistance ground connection) less than the generation of DC transmission line trackside of this settings threshold value.
In the present embodiment in the different districts, external area error carried out simulating, verifying.Please with reference to Fig. 6 to Figure 13, wherein Fig. 6 and Fig. 7 verify mid point metallic earthing fault in the DC power transmission line district; Fig. 8 and Fig. 9 verify through 500 ohm of excessive grounding through resistance faults mid point in the DC power transmission line district; Figure 10 and Figure 11 are outside the DC power transmission line district, the checking result of rectification side generation metallic earthing fault; Figure 12 and Figure 13 are outside the DC power transmission line district, the checking result of inversion side generation metallic earthing fault.Wherein Fig. 6, Fig. 8, Figure 10, Figure 12 all are to be the differentiation result that the electric current of 400Hz-550Hz has been done according to the CF section.Wherein starting threshold value is 0.1In, and the threshold value of special frequency signal is set at 0.01In.Fig. 7, Fig. 9, Figure 11 and Figure 13 all are the differentiation results that done according to the electric current of CF point 600Hz.Wherein starting threshold value is 0.1In, and the threshold value of specific frequency signal is set at 0.01In.
According to the checking result of Fig. 6 to Figure 13, can show significantly method of the present invention in the district, external area error differentiate highly sensitive, selectivity good, quick action, reliability are high.Thereby for DC power transmission line provides reliable relaying protection.
Claims (7)
1. HVDC transmission line quick-action completely guard method that utilizes the DC filter electric current, ultra-high-tension power transmission line comprises the current conversion station at DC power transmission line and two ends thereof, current conversion station comprises direct current filter loop joint; It is characterized in that:
Step 1 obtains the electric parameters signal from the instrument transformer of this utmost point DC filter link;
Step 2 is calculated the current break in the unit interval according to the electric current in the above-mentioned signal, during greater than the starting threshold value, and execution in step three;
Step 3 utilizes digital filter that the electric parameters signal that from step 1, obtains is carried out filtering, obtains the CF electric parameters;
Step 4 is calculated the amplitude of said CF electric parameters;
Step 5, relatively the amplitude of CF electric parameters and the size of setting threshold value when greater than the setting threshold value, are judged to be external area error; When less than the setting threshold value, be judged to be troubles inside the sample space.
2. method according to claim 1 is characterized in that: said current conversion station comprises the DC filtering link, and said DC filtering link comprises smoothing reactor and DC filter, DC filter are provided with said instrument transformer; When the setting threshold value in the said step 5 by the said smoothing reactor outside metallicity fault took place, the sensitive electric parameters of instrument transformer was adjusted, and its value is confirmed by smoothing reactor parameter, DC filter parameter and line parameter circuit value.
3. method according to claim 2; It is characterized in that: the amplitude of the CF electric parameters that calculates by step 4 when said setting threshold value greater than the smoothing reactor outside the most serious external area error takes place, and the amplitude of the CF electric parameters that the most slightly obtains by step 4 during troubles inside the sample space less than the generation of DC transmission line trackside of this settings threshold value.
4. method according to claim 2; It is characterized in that: the electric parameters signal in the said step 3 is a current signal; CF in the said step 3 is CF point or CF section; Said CF point is the tuned frequency point of DC filter, is 12,24 or 36 times of industrial frequency AC frequency; Said CF section is more than the 300Hz.
5. method according to claim 4 is characterized in that: said CF section is 400Hz～550Hz.
6. according to each described method of claim 2-5, it is characterized in that: said CF obtains according to following method:
The minimum input impedance of DC filter when 1) obtaining the circuit external area error, and obtain the impedance magnitude of this minimum input impedance under different frequency, the electric current that flows through DC filter branch road shunt in the case is maximum;
The maximum input impedance of DC filter when 2) obtaining the line areas internal fault, and obtain the impedance magnitude of this maximum input impedance under different frequency, the electric current that flows through DC filter branch road instrument transformer in this case is minimum;
The impedance magnitude of the above-mentioned minimum input impedance that 3) will obtain and the impedance magnitude of maximum input impedance compare, the impedance magnitude of minimum input impedance than the impedance magnitude of maximum input impedance big more than 10 times or more than 100 times pairing frequency or frequency band be CF point or CF band.
7. method according to claim 2 is characterized in that: the method for the CF electric parameters amplitude that calculation of filtered obtains in the said step 4 comprises fourier algorithm, least square method, integration method.
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| CN201110418208.1A CN102522733B (en) | 2011-12-13 | 2011-12-13 | HVDC power-transmission whole-line speed protection method by using direct-current filter current |
| PCT/CN2012/086076 WO2013086944A1 (en) | 2011-12-13 | 2012-12-06 | High-voltage direct-current power-transmission whole-line speed protection method by using direct-current filter current |
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| CN201110418208.1A CN102522733B (en) | 2011-12-13 | 2011-12-13 | HVDC power-transmission whole-line speed protection method by using direct-current filter current |
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| WO2013086944A1 (en) * | 2011-12-13 | 2013-06-20 | 西安交通大学 | High-voltage direct-current power-transmission whole-line speed protection method by using direct-current filter current |
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| CN105891678A (en) * | 2016-04-13 | 2016-08-24 | 上海交通大学 | Ultrahigh voltage direct current line fault discrimination method based on frequency band measurement impedance |
| CN104319747B (en) * | 2014-09-25 | 2017-01-04 | 国家电网公司 | A kind of implementation method of extra-high voltage DC transmission system traveling-wave protection |
| CN108023339A (en) * | 2017-12-09 | 2018-05-11 | 天津大学 | The HVDC transmission line back-up protection method of feature based frequency current |
| CN110336254A (en) * | 2019-06-28 | 2019-10-15 | 国网四川省电力公司电力科学研究院 | A kind of hvdc transmission line guard method based on jump-value of current ratio |
| WO2020015496A1 (en) * | 2018-07-16 | 2020-01-23 | 西安交通大学 | Single-ended electrical quantity-based fast full-circuit protection method using choke to construct circuit boundary |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
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| WO2013086944A1 (en) * | 2011-12-13 | 2013-06-20 | 西安交通大学 | High-voltage direct-current power-transmission whole-line speed protection method by using direct-current filter current |
| CN104319747A (en) * | 2014-09-25 | 2015-01-28 | 中电普瑞电力工程有限公司 | Method for realizing traveling wave protection of ultra-high-voltage direct-current power transmission system |
| CN104319747B (en) * | 2014-09-25 | 2017-01-04 | 国家电网公司 | A kind of implementation method of extra-high voltage DC transmission system traveling-wave protection |
| CN105891678A (en) * | 2016-04-13 | 2016-08-24 | 上海交通大学 | Ultrahigh voltage direct current line fault discrimination method based on frequency band measurement impedance |
| CN105891678B (en) * | 2016-04-13 | 2018-07-27 | 上海交通大学 | The UHVDC Transmission Lines fault distinguishing method of impedance is measured based on frequency band |
| CN108023339A (en) * | 2017-12-09 | 2018-05-11 | 天津大学 | The HVDC transmission line back-up protection method of feature based frequency current |
| WO2020015496A1 (en) * | 2018-07-16 | 2020-01-23 | 西安交通大学 | Single-ended electrical quantity-based fast full-circuit protection method using choke to construct circuit boundary |
| CN110336254A (en) * | 2019-06-28 | 2019-10-15 | 国网四川省电力公司电力科学研究院 | A kind of hvdc transmission line guard method based on jump-value of current ratio |
| CN112600224A (en) * | 2020-12-08 | 2021-04-02 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
| CN112600224B (en) * | 2020-12-08 | 2022-09-30 | 华北电力大学 | LC filtering device and method for offshore flexible direct current transmission system |
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| Publication number | Publication date |
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| CN102522733B (en) | 2014-06-04 |
| WO2013086944A1 (en) | 2013-06-20 |
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