CN102522733B - 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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- 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
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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 Relay Protection Technology in Power System field, specifically, is a kind of HVDC (High Voltage Direct Current) transmission line quick-action completely guard method that utilizes DC filter electric current.
Background technology
High voltage direct current (HVDC) transmission of electricity is large with its through-put power, circuit cost is low, the advantages such as control performance is good, in remote, high-power transmission of electricity, occupy more and more consequence, World Developed Countries all using it as large capacity, the Main Means of remote power transmission and Asynchronous Interconnection, also become the focus of power construction because of " transferring electricity from the west to the east, north and south is confession mutually, national network " in China.Since Ge Zhou Ba to Shanghai in 1989 adopts direct current transportation, China's DC transmission engineering quantity comes out at the top in the world.
The general interconnection as large area networking of HVDC (High Voltage Direct Current) transmission line, its safety and reliability is not only related to the stability of native system, and will directly affect the stable operation of the even whole electrical network of connected regional power grid.Because DC line is long, the probability breaking down is high, and the operation level that therefore improves DC power transmission line relaying protection is significant to ensureing the safety and reliability of 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 mainly with traveling-wave protection as main protection.Traveling-wave protection has advantages of quick action, but in order effectively to utilize the rate of change of voltage, electric current, traveling-wave protection requires high to sample rate.For the selectivity that ensures to protect under thunder and lightning disturbed condition, be forced to reduce the sensitivity of protection, also increase the complexity of protection criterion.Research both at home and abroad shows: traveling-wave protection is not only subject to the impact of thunder and lightning and interference, and can not identify high resistive fault, easily malfunction, and the reliability of action is low.In sum, the DC transmission engineering putting into operation both at home and abroad, the main protection ubiquity of its DC power transmission line theoretical incomplete, there is no blanket setting principle, adjusting only depends on the problems such as simulation result.Thereby it is high to have caused DC line protective relaying device to require sample rate, and exist poor selectivity, sensitivity is low, reliability is not high problem.
For the instant protection completely of the single-end electrical quantity described in patent 201110209681.9, it utilizes electric parameters signal in DC power transmission line side senser to form protection.Because circuit running current is large, during to fault, the reacting condition of electric parameters is insensitive, makes to protect sensitivity low.
Summary of the invention
The object of the present invention is to provide a kind of highly sensitive, selectivity good, quick action, reliability are high HVDC (High Voltage Direct Current) transmission line single-end electrical quantity quick-action completely guard method.Thereby for DC power transmission line provides relaying protection.
For achieving the above object; the invention provides a kind of single-end electrical quantity quick-action completely guard method of identifying HVDC (High Voltage Direct Current) transmission line district internal and external fault, it utilizes the amplitude of characteristic frequency electric parameters in single-end DC filter branches to realize the differentiation of troubles inside the sample space, external area error.
Utilize a HVDC (High Voltage Direct Current) transmission line quick-action completely guard method for DC filter electric current, ultra-high-tension power transmission line comprises the current conversion station at DC power transmission line and two ends thereof, and current conversion station comprises a direct current filter loop joint; Step 1 obtains electric parameters signal from the instrument transformer of this utmost point DC filter link; Step 2, according to the current break in the Current calculation unit interval in above-mentioned signal, while being greater than starting threshold value, execution step three; Step 3, utilizes digital filter to carry out filtering to the electric parameters signal obtaining from step 1, obtains characteristic frequency electric parameters;
Step 5, the relatively amplitude of characteristic frequency electric parameters and the size of setting threshold value, in the time being greater than setting threshold value, is judged to be troubles inside the sample space; In the time being less than setting threshold value, be judged to be external area error.
Described current conversion station comprises DC filtering link, and described DC filtering link comprises smoothing reactor and DC filter, DC filter are provided with described instrument transformer; When setting threshold value in described step 5, by described smoothing reactor outside, metallicity fault occurs, the sensitive electric parameters of instrument transformer is adjusted, and its value is determined by smoothing reactor parameter, DC filter parameter and line parameter circuit value.
Described setting threshold value is greater than the amplitude of the characteristic frequency electric parameters being calculated by step 4 when the most serious external area error occurs for smoothing reactor outside, and this setting threshold value is less than the amplitude of the characteristic frequency electric parameters being obtained by step 4 when the slightest troubles inside the sample space occurs DC transmission line trackside.
Electric parameters signal in described step 3 is current signal, and the characteristic frequency in described step 3 is characteristic frequency point or characteristic frequency section, and the tuned frequency point that described characteristic frequency point is DC filter, is 12,24 or 36 times of industrial frequency AC frequency; Described characteristic frequency section is more than 300Hz.Described characteristic frequency section is 400Hz～550Hz.
Described characteristic frequency obtains in accordance with the following methods:
The minimum input impedance of DC filter while obtaining circuit external area error, and obtain the impedance magnitude of this minimum input impedance under different frequency, flow through in the case the electric current maximum of DC filter branch road shunt;
The maximum input impedance of DC filter while obtaining line areas internal fault, and obtain the impedance magnitude of this maximum input impedance under different frequency, flow through in this case the electric current minimum of DC filter branch road instrument transformer;
The impedance magnitude of above-mentioned minimum input impedance and the impedance magnitude of maximum input impedance that obtain are contrasted, the impedance magnitude of minimum input impedance than the impedance magnitude of maximum input impedance large 10 times above or 100 times corresponding frequency or frequency band are characteristic frequency point or characteristic frequency band above.
Method according to claim 2, is characterized in that: the method for the characteristic frequency electric parameters amplitude that in described step 4, calculation of filtered obtains 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, only needs the single-ended characteristic frequency point of extraction filter branch road or the electric parameters of characteristic frequency band can realize the differentiation of district's internal and external fault.Compared with utilizing the protection of Two-Terminal Electrical Quantities, what be not subject to communication port affects that reliability is high, quick action;
2, the present invention is DC filtering link impedance operator difference during based on DC power transmission line district internal and external fault, proposes DC power transmission line Non-unit protection method, and the relaying protection theory of structure is complete, selectivity good, highly sensitive;
3, compared with the conventional method, the inventive method to the sample frequency of protective device require low, be easy to realize.The problems such as existing DC power transmission line traveling-wave protection is high to sample frequency requirement, poor selectivity, sensitivity is low, reliability is not high are overcome.And further improve and utilized electric parameters signal in DC transmission line trackside instrument transformer to form Reliability of Microprocessor and the sensitivity of instant protection completely of single-ended amount, reduced hardware cost.Can replace the main protection of existing traveling-wave protection as DC power transmission line, be particularly suitable for utilizing single-end electrical quantity to realize all fronts instant protection of spy/super high voltage direct current electricity 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 the advantages that amplitude is high, energy is large, therefore utilize the relaying protection of this frequency signal to there is the feature low to sample rate, reliability is high.
Brief description of the drawings
Fig. 1 is bipolar direct current transmission system structural representation;
Fig. 2 is the smoothing reactor of the bipolar direct current transmission system shown in Fig. 1 and the circuit diagram of the DC filtering link that DC filter forms;
When being circuit external area error, sees Fig. 3 the minimum input impedance of DC filtering link from current conversion station side;
When being line areas internal fault, sees Fig. 4 the maximum input impedance of DC filtering link from AC line trackside;
Fig. 5 is the frequency characteristic of the maximum input impedance in minimum input impedance and the Fig. 4 in Fig. 3;
Fig. 6 is according to the analogous diagram of characteristic frequency section current judgement troubles inside the sample space (DC power transmission line mid point metallic earthing);
Fig. 7 is according to the analogous diagram of characteristic frequency point current judgement troubles inside the sample space (DC power transmission line mid point metallic earthing);
Fig. 8 is according to the analogous diagram of characteristic frequency section current judgement troubles inside the sample space (DC power transmission line mid point is through 500 ohm of transition resistance ground connection);
Fig. 9 is according to the analogous diagram of characteristic frequency point current judgement troubles inside the sample space (DC power transmission line mid point is through 500 ohm of transition resistance ground connection);
Figure 10 is according to the analogous diagram of characteristic frequency section current judgement external area error (rectification side generation metallic earthing);
Figure 11 is according to the analogous diagram of characteristic frequency point current judgement external area error (rectification side generation metallic earthing);
Figure 12 is according to the analogous diagram of characteristic frequency section current judgement external area error (inversion side generation metallic earthing);
Figure 13 is according to the analogous diagram of characteristic frequency point current judgement external area error (inversion side generation metallic earthing);
Embodiment
Please refer to Fig. 1, the structure diagram that Fig. 1 is 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 is all equiped with converter valve 4.F in figure
1, f
2, f
3for fault point, wherein f
1occur in DC power transmission line 3, be called troubles inside the sample space point; f
2and f
3there is current conversion station side, be called external area error point.U
jp, i
jprespectively anodal direct voltage and the direct current of current conversion station 1; u
jn, i
jnrespectively negative pole direct voltage and the direct current of current conversion station 1; u
kp, i
kprespectively anodal direct voltage and the direct current of current conversion station 2; u
kn, i
knrespectively negative pole direct voltage and the direct current of current conversion station 2.In Fig. 1, dotted portion is the filtering link 5 of smoothing reactor and DC filter composition.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 by the A/D converter (not shown) being wherein provided with; and carry out processing, the differentiation of digital signal, 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 by shunt 11 and voltage divider 12 with the converter valve 4 of current conversion station 1.U in figure
1, i
1respectively 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: in the time breaking down DC power transmission line 3rd district, due to the retardation of smoothing reactor 51, the higher-frequency current component that the instrument transformer 8 of DC filter branch road is experienced is very little; In the time breaking down in DC power transmission line 3rd district, owing to there is no 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 large, this characteristic can be used for distinguishing DC power transmission line district internal and external fault, and has higher sensitivity and selectivity.
This otherness showing in DC power transmission line 3rd district, when external area error in order to make full use of filtering link 5; structure has the Principles of Relay Protection of absolutely selective; need to analyze in which frequency band, the maximum current that when DC power transmission line 3 external area error, instrument transformer 8 is experienced is also 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 while there is external area error for this reason
in, the electric current maximum that the instrument transformer 8 of DC filter branch road is experienced in the time of minimum input impedance.The maximum input impedance Z of DC filter 52 when Fig. 4 has provided line areas internal fault
in, the electric current minimum that in this situation, DC filter branch road instrument transformer 8 is experienced.Fig. 5 has provided the impedance frequency characteristic comparison of Fig. 3 and Fig. 4 circuit under the DC filter parameter of certain DC engineering.
From the impedance frequency characteristic of Fig. 5, in the time of DC line external area error, by smoothing reactor 51, high frequency is had to retardation, the higher blockage effect of frequency is more obvious, and the component that frequency is higher is difficult to from DC line district, pass on DC filter branch road; And in the time of 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 of 600Hz, 1200Hz and tri-frequencies of 1800Hz is not had to retardation, that is to say that the electric current under these three frequencies will can not be blocked, the amplitude of these three frequency components that DC filter 52 is experienced can be larger.Contrast knownly, the impedance that minimum impedance characteristic when external area error shows at above three frequencies is much larger than 1k Ω.That is to say, in external area error situation, DC filter branch road at the current component of above three frequencies much smaller than 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. 3 exceeds more than 100 times than Fig. 4.
While considering DC power transmission line 3 troubles inside the sample space, the retardation minimum of DC filter 52 tuned frequencies to signal, the current component of tuned frequency point will be larger, can carry out reliably the differentiation of district's internal and external fault.The energy of considering fault-signal mainly concentrates on low-frequency band, and the distribution character of transmission line parameter and the factor such as filtering and retardation increase of frequency dependent characteristic to high-frequency signal, when transmission line malfunction, high fdrequency component content is in fact less, and this conclusion has also obtained confirmation from the record ripple of direct current transmission line fault.Therefore, although analyzed signal more than 300Hz above and all had the separating capacity of district 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, have more significant technique effect to improving Reliability of Microprocessor and reducing hardware cost.
Embodiment 1:
The single-end electrical quantity quick-action completely guard method of identification HVDC (High Voltage Direct Current) transmission line district internal and external fault, mainly utilizes the amplitude of single-end DC filter branches characteristic frequency electric parameters to realize the differentiation of troubles inside the sample space, 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, obtain the current signal in this utmost point filter branches;
2), according to the current break in the described current signal unit of account time, while being greater than starting threshold value, system breaks down;
3) utilize the digital filter of controlling in protection system 6 to carry out filtering to this electrode current obtaining from step 1), obtain the characteristic frequency magnitude of current;
4) amplitude of the characteristic frequency electric current that calculation of filtered obtains;
5) compare the amplitude of characteristic frequency electric current and the size of setting threshold value, in the time being greater than setting threshold value, be judged to be troubles inside the sample space; In the time being less than setting threshold value, be judged to be external area error; Realize DC power transmission line troubles inside the sample space, external area error differentiation.
Wherein step 2) can carry out in accordance with the following methods:
According to the current break in this utmost point DC filter branch current unit of account time for formula (1), start protection while being greater than starting threshold value, the formula left side is that the sudden change of DC filter branch current, the right are starting threshold value;
Wherein: m=1,2 ..., N; N is sampling number in the unit interval, the namely corresponding sampling number of starting element data window, the desirable 5～10ms of data window length; Current break Δ i=i-I
n, i is this extremely current current sampling data, I
nfor normal running current value before this utmost point fault; k
rfor safety factor, k
r>=1, general desirable 1.2～1.5; I
set=0.1I
n, I
nfor the rated current of DC power transmission line.
The characteristic frequency that step 4) adopts comprises characteristic frequency section and characteristic frequency point.The tuned frequency point that described characteristic frequency point is DC filter, is 12,24 or 36 times (being 600Hz, 1200Hz and 1800Hz) of industrial frequency AC frequency; Described characteristic frequency section is more than 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, have more significant technique effect to improving Reliability of Microprocessor and reducing hardware cost, adopting characteristic frequency section 400Hz～550Hz is preferred version.
The method of the characteristic frequency current amplitude that in step 4), calculation of filtered obtains comprises that fourier algorithm, least square method, integration method and other ask for the algorithm of signal amplitude.
When setting threshold value described in step 5), by smoothing reactor outside (away from AC line trackside), metallicity fault occurs, the sensitive electric parameters of DC filter branch road instrument transformer is adjusted, and its value is determined by smoothing reactor parameter, DC filter parameter and line parameter circuit value.Described setting threshold value is greater than the amplitude of the characteristic frequency electric current for example, being calculated by step 4) when the most serious external area error (metallic earthing) occurs in smoothing reactor outside, and this setting threshold value is less than the amplitude of the characteristic frequency electric current for example, being obtained by step 4) when the slightest troubles inside the sample space (500 ohm of transition resistance ground connection) occurs DC transmission line trackside.
In the present embodiment in different districts, external area error carried out simulating, verifying.Please refer to Fig. 6 to Figure 13, wherein Fig. 6 and Fig. 7 verify mid point metallic earthing fault in DC power transmission line district; Fig. 8 and Fig. 9 verify through 500 ohm of excessive grounding through resistance faults mid point in DC power transmission line district; Figure 10 and Figure 11 are outside DC power transmission line district, the result of rectification side generation metallic earthing fault; Figure 12 and Figure 13 are outside DC power transmission line district, the result of inversion side generation metallic earthing fault.Wherein Fig. 6, Fig. 8, Figure 10, Figure 12 are all differentiation results that the electric current that is 400Hz-550Hz according to characteristic frequency section has been done.Wherein starting threshold value is 0.1In, and the threshold value of special frequency channel signal is set as 0.01In.Fig. 7, Fig. 9, Figure 11 and Figure 13 are all differentiation results of having done according to the electric current of characteristic frequency point 600Hz.Wherein starting threshold value is 0.1In, and the threshold value of specific frequency signal is set as 0.01In.
According to the result of Fig. 6 to Figure 13, can show significantly method of the present invention in 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. utilize a HVDC (High Voltage Direct Current) transmission line quick-action completely guard method for DC filter electric current, ultra-high-tension power transmission line comprises the current conversion station at DC power transmission line and two ends thereof, and current conversion station comprises a direct current filter loop joint; It is characterized in that:
Step 1 obtains electric parameters signal from the instrument transformer of this utmost point DC filter link;
Step 2, according to the current break in the Current calculation unit interval in above-mentioned signal, while being greater than starting threshold value, execution step three;
Step 3, utilizes digital filter to carry out filtering to the electric parameters signal obtaining from step 1, obtains characteristic frequency electric parameters;
Step 4, calculates the amplitude of described characteristic frequency electric parameters;
Step 5, the relatively amplitude of characteristic frequency electric parameters and the size of setting threshold value, in the time being greater than setting threshold value, is judged to be troubles inside the sample space; In the time being less than setting threshold value, be judged to be external area error.
2. method according to claim 1, is characterized in that: described current conversion station comprises DC filtering link, and described DC filtering link comprises smoothing reactor and DC filter, DC filter are provided with described instrument transformer; When setting threshold value in described step 5, by described smoothing reactor outside, metallicity fault occurs, the sensitive electric parameters of instrument transformer is adjusted, and its value is determined by smoothing reactor parameter, DC filter parameter and line parameter circuit value.
3. method according to claim 2, it is characterized in that: described setting threshold value is greater than the amplitude of the characteristic frequency electric parameters being calculated by step 4 when the most serious external area error occurs for smoothing reactor outside, and this setting threshold value is less than the amplitude of the characteristic frequency electric parameters being obtained by step 4 when the slightest troubles inside the sample space occurs DC transmission line trackside.
4. method according to claim 2, it is characterized in that: the electric parameters signal in described step 3 is current signal, characteristic frequency in described step 3 is characteristic frequency point or characteristic frequency section, the tuned frequency point that described characteristic frequency point is DC filter, is 12,24 or 36 times of industrial frequency AC frequency; Described characteristic frequency section is more than 300Hz.
5. method according to claim 4, is characterized in that: described characteristic frequency section is 400Hz～550Hz.
6. according to the method described in claim 2-5 any one, it is characterized in that: described characteristic frequency obtains in accordance with the following methods:
1) the minimum input impedance of DC filter while obtaining circuit external area error, and obtain the impedance magnitude of this minimum input impedance under different frequency, flow through in the case the electric current maximum of DC filter branch road shunt;
2) the maximum input impedance of DC filter while obtaining line areas internal fault, and obtain the impedance magnitude of this maximum input impedance under different frequency, flow through in this case the electric current minimum of DC filter branch road instrument transformer;
3) impedance magnitude of above-mentioned minimum input impedance and the impedance magnitude of maximum input impedance that obtain are contrasted, the impedance magnitude of minimum input impedance than the impedance magnitude of maximum input impedance large 10 times above or 100 times corresponding frequency or frequency band are characteristic frequency point or characteristic frequency band above.
7. method according to claim 2, is characterized in that: the method for the characteristic frequency electric parameters amplitude that in described step 4, calculation of filtered obtains 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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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102522733B (en) * | 2011-12-13 | 2014-06-04 | 西安交通大学 | HVDC power-transmission whole-line speed protection method by using direct-current filter current |
| 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 |
| CN108023339B (en) * | 2017-12-09 | 2019-11-01 | 天津大学 | HVDC transmission line back-up protection method based on characteristic frequency electric current |
| CN109149532B (en) * | 2018-07-16 | 2020-03-13 | 西安交通大学 | Single-end electric quantity full-line quick-action protection method for constructing line boundary by using choke coil |
| 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 |
| 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 |
| CN112595932B (en) * | 2020-12-23 | 2024-03-01 | 西安科技大学 | Monopole fault line selection method suitable for medium-voltage direct-current power distribution network |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN102255293A (en) * | 2011-07-26 | 2011-11-23 | 西安交通大学 | Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region |
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| SE512084C2 (en) * | 1998-05-29 | 2000-01-24 | Abb Ab | Detection of faults on transmission lines of a bipolar high voltage DC system |
| CN101697411B (en) * | 2009-10-29 | 2012-05-30 | 华南理工大学 | Method for protecting transient state energy of DC power transmission line |
| CN102522733B (en) * | 2011-12-13 | 2014-06-04 | 西安交通大学 | HVDC power-transmission whole-line speed protection method by using direct-current filter current |
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2011
- 2011-12-13 CN CN201110418208.1A patent/CN102522733B/en not_active Expired - Fee Related
-
2012
- 2012-12-06 WO PCT/CN2012/086076 patent/WO2013086944A1/en active Application Filing
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102255293A (en) * | 2011-07-26 | 2011-11-23 | 西安交通大学 | Single-ended electrical quantity full-line quick-action protection method for recognizing faults inside and outside high-voltage direct-current transmission line region |
Non-Patent Citations (4)
| Title |
|---|
| ±800kV特高压直流输电线路单端电气量暂态保护;束洪春等;《中国电机工程学报》;20101105;第30卷(第31期);摘要，第109-110页 1 UHVDC输电线路边界元件的特性分析，图1-3 * |
| 张保会等.高压直流线路单端暂态量保护研究.《电力系统保护与控制》.2010,第38卷(第15期),摘要，第19-21页 1 直流输电线路暂态量保护方案 2 直流输电线路暂态量保护原理，图1、2、5. |
| 束洪春等.±800kV特高压直流输电线路单端电气量暂态保护.《中国电机工程学报》.2010,第30卷(第31期),摘要，第109-110页 1 UHVDC输电线路边界元件的特性分析，图1-3. |
| 高压直流线路单端暂态量保护研究;张保会等;《电力系统保护与控制》;20100801;第38卷(第15期);摘要，第19-21页 1 直流输电线路暂态量保护方案 2 直流输电线路暂态量保护原理，图1、2、5 * |
Also Published As
| Publication number | Publication date |
|---|---|
| WO2013086944A1 (en) | 2013-06-20 |
| CN102522733A (en) | 2012-06-27 |
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