CN107449988B - A kind of the fault type judgment method and device of flexible HVDC transmission system - Google Patents
A kind of the fault type judgment method and device of flexible HVDC transmission system Download PDFInfo
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- CN107449988B CN107449988B CN201710806877.3A CN201710806877A CN107449988B CN 107449988 B CN107449988 B CN 107449988B CN 201710806877 A CN201710806877 A CN 201710806877A CN 107449988 B CN107449988 B CN 107449988B
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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
Abstract
The invention discloses the fault type judgment methods and device of a kind of flexible HVDC transmission system, it solves in the prior art, when judging in area and external area error, it is compared using the bimodulus analog quantity of electric current and voltage and carries out fault type judgement, if any one analog quantity sampling is abnormal, it then will lead to judging result misalignment, result in and distinguish symmetrical in area and asymmetry, area's external symmetry and unbalanced fault method there are reliabilities low, there is technical issues that very big judging result.
Description
Technical field
The present invention relates to the fault type judgements that power failure judges field more particularly to a kind of flexible HVDC transmission system
Method and device.
Background technique
When flexible HVDC transmission system is connected to active power grid, in face of the Voltage Drop failure of power grid, need to take measures
It copes with, low voltage ride-through function is a kind of measure commonplace at present, and Voltage Drop failure is respectively occurring at flexible direct current
When in the area Wai He, area of transmission system, the bridge arm current maximum value and bridge arm current change rate that troubles inside the sample space generates are all bigger,
The submodule of flexible DC transmission device may be damaged due to overcurrent.So Control protection system should be distinguished outside the area Nei He, area
Failure, to take different treatment measures.
In the prior art, it when judging in area and external area error, is compared using the bimodulus analog quantity of electric current and voltage and carries out event
Hinder type to judge, if any one analog quantity sampling is abnormal, will lead to judging result misalignment, result in and distinguish in area symmetrically
That there are reliabilities is low with the method for asymmetric, area's external symmetry and unbalanced fault, and the technology that there is very big judging result misalignment is asked
Topic.
Summary of the invention
It is existing for solving the present invention provides the fault type judgment method and device of a kind of flexible HVDC transmission system
In technology, when judging in area and external area error, is compared using the bimodulus analog quantity of electric current and voltage and carry out fault type judgement, such as
The sampling of any one of fruit analog quantity is abnormal, then will lead to judging result misalignment, results in and distinguishes outside symmetrical in area and asymmetric, area
That there are reliabilities is low for symmetrical and unbalanced fault method, there is technical issues that very big judging result.
A kind of fault type judgment method of flexible HVDC transmission system provided by the invention, comprising:
S1: the primary side voltage and secondary side voltage of the tietransformer of flexible HVDC transmission system are got, and is calculated
Respectively obtain the positive-sequence component of the primary side voltage and positive-sequence component, the negative phase-sequence of zero-sequence component and the secondary side voltage
Component and zero-sequence component；
S2: if the positive-sequence component of the primary side voltage thens follow the steps S3 less than the first preset value；
S3: if the negative sequence component of the secondary side voltage is less than the zero-sequence component of the second preset value and the secondary side voltage
Less than third preset value, S4 is thened follow the steps, it is no to then follow the steps S5；
S4: if the positive-sequence component of the secondary side voltage is less than the positive-sequence component of the primary side voltage, determine failure
Type is symmetric fault in area, is otherwise determined as area's external symmetry failure；
S5: if the zero-sequence component of the secondary side voltage is greater than the zero-sequence component of the primary side voltage, determine failure
Type is unbalanced fault in area, is otherwise determined as unbalanced fault outside area.
Preferably, after the step S4, before step S5 further include:
If it is determined that fault type is symmetric fault in area, then the low voltage ride-through function of flexible HVDC transmission system is latched；
If it is determined that fault type is area's external symmetry failure, then start the low voltage ride-through function of flexible HVDC transmission system.
Preferably, after the step S5 further include:
If it is determined that fault type is unbalanced fault in area, then the low voltage crossing function of flexible HVDC transmission system is latched
Energy；
If it is determined that fault type is unbalanced fault outside area, then start the low voltage crossing function of flexible HVDC transmission system
Energy.
Preferably, first preset value is specially 0.85pu, and first preset value is using stable state positive sequence voltage as base
The per unit value of quasi- value.
Preferably, second preset value is specially 0.01pu, and second preset value is using stable state negative sequence voltage as base
The per unit value of quasi- value；
The third preset value is specially 0.01pu, and the third preset value is the mark being worth on the basis of stable state residual voltage
Value.
A kind of fault type judgment means of flexible HVDC transmission system provided by the invention, comprising:
First obtains module, for getting the primary side voltage of the tietransformer of flexible HVDC transmission system and secondary
Side voltage；
First computing module, for calculating the positive-sequence component and zero-sequence component that respectively obtain the primary side voltage, and
Positive-sequence component, negative sequence component and the zero-sequence component of the secondary side voltage；
First judgment module, for judge the positive-sequence component of the primary side voltage whether less than the first preset value, if so,
Then trigger the second judgment module；
Second judgment module, for judging the negative sequence component of the secondary side voltage whether less than the second preset value and described
Whether the zero-sequence component of secondary side voltage is less than third preset value, if then triggering third judgment module, if it is not, then triggering the 4th
Judgment module；
Third judgment module, for judging whether the positive-sequence component of the secondary side voltage is less than the primary side voltage
Positive-sequence component, if so, determining that fault type is symmetric fault in area, if it is not, being then determined as area's external symmetry failure；
4th judgment module, for judging whether the zero-sequence component of the secondary side voltage is greater than the primary side voltage
Zero-sequence component, if so, determining that fault type is unbalanced fault in area, if it is not, being then determined as unbalanced fault outside area.
Preferably, further includes:
First lock modules, be used for if it is determined that fault type be area in symmetric fault, then be latched flexible HVDC transmission system
Low voltage ride-through function；
First starting module, be used for if it is determined that fault type be area's external symmetry failure, then start flexible HVDC transmission system
Low voltage ride-through function.
Preferably, further includes:
Second lock modules, be used for if it is determined that fault type be area in unbalanced fault, then be latched flexible DC transmission system
The low voltage ride-through function of system；
Second starting module, be used for if it is determined that fault type be area outside unbalanced fault, then start flexible DC transmission system
The low voltage ride-through function of system.
Preferably, first judgment module, specifically for judging whether the positive-sequence component of the primary side voltage is less than
0.85pu, if so, the second judgment module of triggering.
Preferably, the second judgment module, specifically for judging that negative sequence component and the zero-sequence component of the secondary side voltage be
No to be respectively smaller than 0.01pu, second preset value is specially 0.01pu, and second preset value is to be with stable state negative sequence voltage
The per unit value of a reference value, the third preset value is specially 0.01pu, and the third preset value is using stable state residual voltage as base
The per unit value of quasi- value, if so, triggering third judgment module, if it is not, then triggering the 4th judgment module.
As can be seen from the above technical solutions, the invention has the following advantages that
The fault type judgment method of a kind of flexible HVDC transmission system provided by the invention, comprising: S1: get flexibility
The primary side voltage and secondary side voltage of the tietransformer of DC transmission system, and calculate and respectively obtain the primary side voltage
Positive-sequence component and zero-sequence component and the secondary side voltage positive-sequence component, negative sequence component and zero-sequence component；S2: if institute
The positive-sequence component of primary side voltage is stated less than the first preset value, thens follow the steps S3；S3: if the negative phase-sequence of the secondary side voltage point
Amount is less than third preset value less than the zero-sequence component of the second preset value and the secondary side voltage, thens follow the steps S4, otherwise holds
Row step S5；S4: if the positive-sequence component of the secondary side voltage is less than the positive-sequence component of the primary side voltage, determine failure
Type is symmetric fault in area, is otherwise determined as area's external symmetry failure；S5: if the zero-sequence component of the secondary side voltage is greater than institute
The zero-sequence component of primary side voltage is stated, then determines fault type for unbalanced fault in area, is otherwise determined as outside area asymmetric event
Barrier.
In the present invention, pass through the sequence of tietransformer primary side voltage and secondary side voltage to flexible HVDC transmission system
The comparative analysis of component has carried out symmetrical in area and asymmetric, area's external symmetry and the differentiation of unbalanced fault and judgement, has solved
In the prior art, when judging in area and external area error, progress fault type is compared using the bimodulus analog quantity of electric current and voltage and is sentenced
It is disconnected, if any one analog quantity sampling is abnormal, will lead to judging result misalignment, in caused differentiations area it is symmetrical with it is not right
Claim, that there are reliabilities is low for the method for area's external symmetry and unbalanced fault, there is technical issues that very big judging result.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention without any creative labor, may be used also for those of ordinary skill in the art
To obtain other attached drawings according to these attached drawings.
Fig. 1 is a kind of one embodiment of the fault type judgment method of flexible HVDC transmission system provided by the invention
Flow diagram；
Fig. 2 is a kind of another embodiment of the fault type judgment method of flexible HVDC transmission system provided by the invention
Flow diagram；
Fig. 3 is a kind of one embodiment of the fault type judgment means of flexible HVDC transmission system provided by the invention
Structural schematic diagram.
Specific embodiment
The embodiment of the invention provides the fault type judgment methods and device of a kind of flexible HVDC transmission system, solve
In the prior art, when judging in area and external area error, progress fault type is compared using the bimodulus analog quantity of electric current and voltage and is sentenced
It is disconnected, if any one analog quantity sampling is abnormal, will lead to judging result misalignment, in caused differentiations area it is symmetrical with it is not right
Claim, that there are reliabilities is low for the method for area's external symmetry and unbalanced fault, there is technical issues that very big judging result.
In order to make the invention's purpose, features and advantages of the invention more obvious and easy to understand, below in conjunction with the present invention
Attached drawing in embodiment, technical scheme in the embodiment of the invention is clearly and completely described, it is clear that disclosed below
Embodiment be only a part of the embodiment of the present invention, and not all embodiment.Based on the embodiments of the present invention, this field
Those of ordinary skill's all other embodiment obtained without making creative work, belongs to protection of the present invention
Range.
Referring to Fig. 1, the embodiment of the invention provides a kind of fault type judgment methods of flexible HVDC transmission system
One embodiment, comprising:
S101: the tietransformer primary side voltage and secondary side voltage of flexible HVDC transmission system are got, and is calculated
Respectively obtain positive-sequence component and zero-sequence component and the positive-sequence component of secondary side voltage, negative sequence component and zero of primary side voltage
Order components；
It should be noted that the calculation method of primary voltage U1 positive-sequence component is as follows:
The change of current is become into primary voltage U1 and carries out positive-sequence coordinate transformation, from three-phase instantaneous coordinate to two cordic phase rotators, then
Positive-sequence component extraction is carried out, calculates positive sequence voltage modulus value again later；
The calculation method of primary voltage U1 negative sequence component is as follows:
The change of current is become into primary voltage U1 and carries out negative phase-sequence coordinate transform, from three-phase instantaneous coordinate to two cordic phase rotators, then
Negative sequence component extraction is carried out, calculates negative sequence voltage modulus value again later；
The calculation method of primary voltage U1 zero-sequence component is as follows:
The three-phase voltage that the change of current becomes primary voltage U1 is separately summed, then is averaged, zero-sequence component is obtained.
The calculation method of secondary voltage U2 positive-sequence component is as follows:
The change of current is become into secondary voltage U2 and carries out positive-sequence coordinate transformation, from three-phase instantaneous coordinate to two cordic phase rotators, then
Positive-sequence component extraction is carried out, calculates positive sequence voltage modulus value again later；
The calculation method of secondary voltage U2 negative sequence component is as follows:
The change of current is become into secondary voltage U2 and carries out negative phase-sequence coordinate transform, from three-phase instantaneous coordinate to two cordic phase rotators, then
Negative sequence component extraction is carried out, calculates negative sequence voltage modulus value again later；
The calculation method of secondary voltage U2 zero-sequence component is as follows:
The three-phase voltage that the change of current becomes secondary voltage U2 is separately summed, then is averaged, zero-sequence component is obtained, counts again later
Calculate residual voltage modulus value.
S102: if the positive-sequence component of primary side voltage thens follow the steps S103 less than the first preset value；
S103: if the negative sequence component of secondary side voltage is less than the zero-sequence component of the second preset value and secondary side voltage less than
Three preset values then follow the steps S104, no to then follow the steps S105；
First preset value is specially 0.85pu, and the first preset value is the per unit value being worth on the basis of stable state positive sequence voltage, the
Two preset values are specially 0.01pu, and the second preset value is the per unit value being worth on the basis of stable state negative sequence voltage, third preset value tool
Body is 0.01pu, and third preset value is the per unit value being worth on the basis of stable state residual voltage；
S104: if the positive-sequence component of secondary side voltage is less than the positive-sequence component of primary side voltage, determine that fault type is
Otherwise symmetric fault in area is determined as area's external symmetry failure；
S105: if the zero-sequence component of secondary side voltage is greater than the zero-sequence component of primary side voltage, determine that fault type is
Otherwise unbalanced fault in area is determined as unbalanced fault outside area.
It is the description carried out to a kind of one embodiment of the fault type judgment method of flexible HVDC transmission system above,
Here is a kind of another embodiment of the fault type judgment method of flexible HVDC transmission system, to by above-described embodiment
The fault type judgment method safeguard measure process that obtains carrying out after judging result be described.
Referring to Fig. 2, a kind of another reality of the fault type judgment method of flexible HVDC transmission system provided by the invention
Apply example, comprising:
S201: if it is determined that fault type is symmetric fault in area, then it is latched the low voltage crossing of flexible HVDC transmission system
Function；
S202: if it is determined that fault type is area's external symmetry failure, then start the low voltage crossing of flexible HVDC transmission system
Function；
S203: if it is determined that fault type is unbalanced fault in area, then the low-voltage for being latched flexible HVDC transmission system is worn
More function；
S204: if it is determined that fault type is unbalanced fault outside area, then the low-voltage for starting flexible HVDC transmission system is worn
More function.
It should be noted that low voltage crossing strategy refers to one end as control active power, limitation active power is closed
The output of ring, idle control are switched to the control of transient AC voltage, and after alternating voltage recovery, active power reference value is from current
Reference value before actual power value is climbed to failure, it is idle control by transient AC voltage through climbing switch to Reactive Power Control or
Stable state Regulation Control.
As one end of control DC voltage, the output of direct current pressure ring is limited, idle control is switched to transient AC electricity
Voltage-controlled system, after alternating voltage recovery, direct current pressure ring restores voltage regulation function, and idle control is cut by transient AC voltage through climbing
Shift to Reactive Power Control or stable state Regulation Control.
It is to be retouched to what a kind of another embodiment of the fault type judgment method of flexible HVDC transmission system carried out above
It states, a kind of one embodiment of the fault type judgment means to flexible HVDC transmission system is described below.
Referring to Fig. 3, a kind of implementation of the fault type judgment means of flexible HVDC transmission system provided by the invention
Example, comprising:
First obtain module 301, for get flexible HVDC transmission system tietransformer primary side voltage and
Secondary side voltage；
First computing module 302, for calculating the positive-sequence component and zero-sequence component and two that respectively obtain primary side voltage
Positive-sequence component, negative sequence component and the zero-sequence component of secondary side voltage；
First judgment module 303, for judge the positive-sequence component of primary side voltage whether less than the first preset value, if so,
Then trigger the second judgment module 304；
Whether the second judgment module 304, negative sequence component and zero-sequence component for judging secondary side voltage are respectively smaller than
0.01pu, the second preset value are specially 0.01pu, and the second preset value is the per unit value being worth on the basis of stable state negative sequence voltage, third
Preset value is specially 0.01pu, and third preset value is the per unit value being worth on the basis of stable state residual voltage, if then triggering third
Judgment module 305, if it is not, then triggering the 4th judgment module 308；
Third judgment module 305, for judging whether the positive-sequence component of secondary side voltage is less than the positive sequence of primary side voltage
Component if so, determining that fault type is symmetric fault in area, and triggers the first lock modules 306, if it is not, being then determined as area
External symmetry failure, and trigger the first starting module 307；
First lock modules 306, be used for if it is determined that fault type be area in symmetric fault, then be latched flexible DC transmission system
The low voltage ride-through function of system；
First starting module 307, be used for if it is determined that fault type be area's external symmetry failure, then start flexible DC transmission system
The low voltage ride-through function of system
4th judgment module 308, for judging whether the zero-sequence component of secondary side voltage is greater than the zero sequence of primary side voltage
Component if so, determining that fault type is unbalanced fault in area, and triggers the second lock modules 309, if it is not, being then determined as
Unbalanced fault outside area, and trigger the second starting module 310；
Second lock modules 309, be used for if it is determined that fault type be area in unbalanced fault, then be latched flexible DC transmission
The low voltage ride-through function of system；
Second starting module 310, be used for if it is determined that fault type be area outside unbalanced fault, then start flexible DC transmission
The low voltage ride-through function of system.
Specific embodiment in the present embodiment illustrates which is not described herein again in the above-described embodiments.
It is apparent to those skilled in the art that for convenience and simplicity of description, the system of foregoing description,
The specific work process of system and module, can refer to corresponding processes in the foregoing method embodiment, and details are not described herein.
In several embodiments provided herein, it should be understood that disclosed module and method can pass through it
Its mode is realized.For example, module embodiments described above are only schematical, for example, the division of the module, only
Only a kind of logical function partition, there may be another division manner in actual implementation, such as multiple module or components can be tied
Another system is closed or is desirably integrated into, or some features can be ignored or not executed.Another point, it is shown or discussed
Mutual coupling, direct-coupling or communication connection can be through some interfaces, the INDIRECT COUPLING or logical of device or module
Letter connection can be electrical property, mechanical or other forms.
The module as illustrated by the separation member may or may not be physically separated, aobvious as module
The component shown may or may not be physical module, it can and it is in one place, or may be distributed over multiple
On network module.Some or all of the modules therein can be selected to realize the mesh of this embodiment scheme according to the actual needs
's.
It, can also be in addition, each functional module in each embodiment of the present invention can integrate in a processing module
It is that modules physically exist alone, can also be integrated in two or more modules in a module.Above-mentioned integrated mould
Block both can take the form of hardware realization, can also be realized in the form of software function module.
The above, the above embodiments are merely illustrative of the technical solutions of the present invention, rather than its limitations；Although referring to before
Stating embodiment, invention is explained in detail, those skilled in the art should understand that: it still can be to preceding
Technical solution documented by each embodiment is stated to modify or equivalent replacement of some of the technical features；And these
It modifies or replaces, the spirit and scope for technical solution of various embodiments of the present invention that it does not separate the essence of the corresponding technical solution.
Claims (10)
1. a kind of fault type judgment method of flexible HVDC transmission system, it is characterized in that, comprising:
S1: the primary side voltage and secondary side voltage of the tietransformer of flexible HVDC transmission system are got, and calculates difference
Obtain the positive-sequence component and zero-sequence component and the positive-sequence component of the secondary side voltage, negative sequence component of the primary side voltage
And zero-sequence component；
S2: if the positive-sequence component of the primary side voltage thens follow the steps S3 less than the first preset value；
S3: if the negative sequence component of the secondary side voltage is less than less than the zero-sequence component of the second preset value and the secondary side voltage
Third preset value thens follow the steps S4, no to then follow the steps S5；
S4: if the positive-sequence component of the secondary side voltage is less than the positive-sequence component of the primary side voltage, determine fault type
For symmetric fault in area, otherwise it is determined as area's external symmetry failure；
S5: if the zero-sequence component of the secondary side voltage is greater than the zero-sequence component of the primary side voltage, determine fault type
For unbalanced fault in area, otherwise it is determined as unbalanced fault outside area.
2. the fault type judgment method of flexible HVDC transmission system according to claim 1, which is characterized in that the step
After rapid S4, before step S5 further include:
If it is determined that fault type is symmetric fault in area, then the low voltage ride-through function of flexible HVDC transmission system is latched；
If it is determined that fault type is area's external symmetry failure, then start the low voltage ride-through function of flexible HVDC transmission system.
3. the fault type judgment method of flexible HVDC transmission system according to claim 1 or 2, which is characterized in that institute
After stating step S5 further include:
If it is determined that fault type is unbalanced fault in area, then the low voltage ride-through function of flexible HVDC transmission system is latched；
If it is determined that fault type is unbalanced fault outside area, then start the low voltage ride-through function of flexible HVDC transmission system.
4. the fault type judgment method of flexible HVDC transmission system according to claim 1 or 2, which is characterized in that institute
Stating the first preset value is specially 0.85pu, and first preset value is the per unit value being worth on the basis of stable state positive sequence voltage.
5. the fault type judgment method of flexible HVDC transmission system according to claim 1 or 2, which is characterized in that institute
Stating the second preset value is specially 0.01pu, and second preset value is the per unit value being worth on the basis of stable state negative sequence voltage；
The third preset value is specially 0.01pu, and the third preset value is the mark being worth on the basis of stable state residual voltage
Value.
6. a kind of fault type judgment means of flexible HVDC transmission system, it is characterized in that, comprising:
First obtains module, for getting the primary side voltage and secondary side electricity of the tietransformer of flexible HVDC transmission system
Pressure；
First computing module, for calculating the positive-sequence component and zero-sequence component and described that respectively obtain the primary side voltage
Positive-sequence component, negative sequence component and the zero-sequence component of secondary side voltage；
First judgment module, for judging the positive-sequence component of the primary side voltage whether less than the first preset value, if so, touching
Send out the second judgment module；
Second judgment module, for judging the negative sequence component of the secondary side voltage whether less than the second preset value and described secondary
Whether the zero-sequence component of side voltage is less than third preset value, if then triggering third judgment module, if it is not, then the 4th judgement of triggering
Module；
Third judgment module, for judging whether the positive-sequence component of the secondary side voltage is less than the positive sequence of the primary side voltage
Component, if so, determining that fault type is symmetric fault in area, if it is not, being then determined as area's external symmetry failure；
4th judgment module, for judging whether the zero-sequence component of the secondary side voltage is greater than the zero sequence of the primary side voltage
Component, if so, determining that fault type is unbalanced fault in area, if it is not, being then determined as unbalanced fault outside area.
7. the fault type judgment means of flexible HVDC transmission system according to claim 6, which is characterized in that also wrap
It includes:
First lock modules, be used for if it is determined that fault type be area in symmetric fault, then be latched the low of flexible HVDC transmission system
Voltage ride-through function；
First starting module, be used for if it is determined that fault type be area's external symmetry failure, then start the low of flexible HVDC transmission system
Voltage ride-through function.
8. the fault type judgment means of flexible HVDC transmission system according to claim 6 or 7, which is characterized in that also
Include:
Second lock modules, be used for if it is determined that fault type be area in unbalanced fault, then be latched flexible HVDC transmission system
Low voltage ride-through function；
Second starting module, be used for if it is determined that fault type be area outside unbalanced fault, then start flexible HVDC transmission system
Low voltage ride-through function.
9. the fault type judgment means of flexible HVDC transmission system according to claim 6 or 7, which is characterized in that
First judgment module, specifically for judging whether the positive-sequence component of the primary side voltage is less than 0.85pu, if so, touching
Send out the second judgment module.
10. the fault type judgment means of flexible HVDC transmission system according to claim 6 or 7, which is characterized in that
Whether the second judgment module is respectively smaller than specifically for the negative sequence component and zero-sequence component for judging the secondary side voltage
0.01pu, second preset value is specially 0.01pu, and second preset value is the mark being worth on the basis of stable state negative sequence voltage
Value, the third preset value is specially 0.01pu, and the third preset value is the mark being worth on the basis of stable state residual voltage
Value, if so, triggering third judgment module, if it is not, then triggering the 4th judgment module.
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| CN1902798A (en) * | 2003-12-31 | 2007-01-24 | Abb公司 | Method and device for fault detection in transformers or power lines |
| WO2006130722A2 (en) * | 2005-06-01 | 2006-12-07 | Schweitzer Engineering Laboratories, Inc. | An apparatus and method for determining a faulted phase of a three-phase ungrounded power system |
| CN1964149A (en) * | 2006-12-19 | 2007-05-16 | 北京四方继保自动化股份有限公司 | A differential protection method for negative sequence current of large power transformer |
| CN102654552A (en) * | 2012-04-16 | 2012-09-05 | 昆明理工大学 | Method for protecting transient voltages at two terminals of super-high voltage direct current transmission line |
| CN104319737A (en) * | 2014-10-30 | 2015-01-28 | 国网宁夏电力公司电力科学研究院 | Differential protection configuration method and device for sending transformer out of double-feed type wind field |
| CN105044551A (en) * | 2015-06-10 | 2015-11-11 | 中国电力科学研究院 | Fault positioning method for overhead line-high voltage cable mixing line |
| CN106026041A (en) * | 2016-05-26 | 2016-10-12 | 天津大学 | Pilot protection method for flexible DC interconnection device outlet line |
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| CN107449988A (en) | 2017-12-08 |
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