CN110571779B - Self-generating power supply type ground fault compensation system and fault line selection method - Google Patents
Self-generating power supply type ground fault compensation system and fault line selection method Download PDFInfo
- Publication number
- CN110571779B CN110571779B CN201910992179.6A CN201910992179A CN110571779B CN 110571779 B CN110571779 B CN 110571779B CN 201910992179 A CN201910992179 A CN 201910992179A CN 110571779 B CN110571779 B CN 110571779B
- Authority
- CN
- China
- Prior art keywords
- phase
- voltage
- line
- power supply
- zero
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
Images
Classifications
-
- 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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H1/00—Details of emergency protective circuit arrangements
- H02H1/0007—Details of emergency protective circuit arrangements concerning the detecting means
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H9/00—Emergency protective circuit arrangements for limiting excess current or voltage without disconnection
- H02H9/08—Limitation or suppression of earth fault currents, e.g. Petersen coil
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y04—INFORMATION OR COMMUNICATION TECHNOLOGIES HAVING AN IMPACT ON OTHER TECHNOLOGY AREAS
- Y04S—SYSTEMS INTEGRATING TECHNOLOGIES RELATED TO POWER NETWORK OPERATION, COMMUNICATION OR INFORMATION TECHNOLOGIES FOR IMPROVING THE ELECTRICAL POWER GENERATION, TRANSMISSION, DISTRIBUTION, MANAGEMENT OR USAGE, i.e. SMART GRIDS
- Y04S10/00—Systems supporting electrical power generation, transmission or distribution
- Y04S10/50—Systems or methods supporting the power network operation or management, involving a certain degree of interaction with the load-side end user applications
- Y04S10/52—Outage or fault management, e.g. fault detection or location
Abstract
The invention discloses a self-generating power supply type ground fault compensation system and a fault line selection method, wherein after the system is grounded in a single phase, the compensation system adjusts output voltage to completely compensate ground current and records the voltage as a first characteristic voltage; recording the zero-sequence current amplitude of each line as a first zero-sequence current set at the moment; adjusting the output voltage of the compensation system to be second characteristic voltage, and recording the zero-sequence current amplitude of each line under the second characteristic voltage as a second zero-sequence current set; adjusting the output voltage of the compensation system to be third characteristic voltage, and recording the zero-sequence current amplitude of each line under the third characteristic voltage as a third zero-sequence current set; calculating the absolute value of the amplitude difference value of the lines corresponding to the first zero-sequence current set and the second zero-sequence current set as a characteristic zero-sequence current set; when all elements in the characteristic zero sequence current set are smaller than the amplitude characteristic threshold value, the bus is judged to be grounded; otherwise, the line corresponding to the maximum element in the characteristic zero sequence current set is a grounding line.
Description
Technical Field
The invention relates to the technical field of power distribution networks, in particular to a self-generating power supply type ground fault compensation system and a fault line selection method.
Background
The single-phase earth fault of the power distribution network at home and abroad accounts for more than 80 percent, the safe operation of the power grid and equipment is seriously influenced, and the safe processing of the earth fault plays an important role in social and economic development. When the capacitance current of the system is more than 10A, an arc suppression coil grounding mode is adopted. The arc suppression coil can reduce the fault current to a certain extent, the system can operate for 2 hours with faults, but the arc suppression coil can not realize full compensation, residual current smaller than 10A still exists at a fault point, the residual current can cause personal electric shock and fire accidents, and the safe and stable operation of a power grid and equipment is seriously threatened. When the capacitance current of the system is large, a small-resistance grounding mode is mostly adopted, when a single-phase grounding fault occurs, the zero sequence current of the fault line is amplified, and the relay protection device quickly cuts off the fault line.
At present, the over current of a line is compensated and restrained by an external power supply, under a new full compensation system, after the ground current is completely compensated by the compensation system, the amplitude and the phase of the zero-sequence current of each line are only related to the parameters of the line, and the line selection cannot be carried out according to the steady-state amplitude or the phase.
Disclosure of Invention
In view of the above, the inventor proposes that by changing the output voltage of the self-generating power supply type ground fault compensator twice, the amplitude of the non-fault phase zero-sequence current of the system is very small, and the zero-sequence current of the fault line is very large, so that the ground line can be accurately and quickly determined according to the obvious characteristic, and a basis is provided for fault processing.
The invention solves the technical problems by the following technical means:
the invention discloses a self-generating power supply type ground fault compensation system which comprises a line phase converter, a fling-cut switch, a voltage and current collector and a controller, wherein the line phase converter is connected with a bus, the line phase converter is connected with the bus and then is connected to a neutral point of the system through the fling-cut switch, the input end of the controller is connected with a voltage transformer of the bus, the voltage and current collector is connected between the fling-cut switch and the neutral point in series, the output end of the voltage and current collector is connected with the input end of the controller, and the output end of the controller is respectively connected with the fling-cut switch and the input end of the line phase converter.
Further, the line-phase converter changes the line voltage of the bus into an inverted voltage with the same amplitude and opposite phase with the voltage of the bus, and the voltage can completely compensate the current of the ground fault point. The line-phase converter comprises a phase power supply generator and a power supply phase compensator, wherein the phase power supply generator is connected in a Dy or Zy or Yd or Yy form, and the phase power supply phase compensator is connected in a Dyn or Zyn or Yyn form.
Further, the controller judges the grounding phase of the bus through the voltage transformer, when a grounding fault occurs, the controller controls the fling-cut switch to close the corresponding phase, and the current of a grounding fault point is completely compensated through the reversed-phase voltage which is output by the line phase converter and is opposite to the voltage phase of the bus and has the same amplitude.
The invention relates to a fault line selection method of a self-generated power supply type ground fault compensation system, which is specifically executed according to the following steps:
s1, after the system is grounded in a single phase, the line phase-change converter outputs a first compensation voltage to completely compensate the grounding current, the voltage current collector records that the current injected into the system by the current line phase-change converter is a first injection current, records that the voltage output by the current line phase-change converter is a first characteristic voltage, and records that the zero-sequence current of any line is a first line zero-sequence current;
s2, the controller adjusts the output voltage of the line phase converter to be a second characteristic voltage, and the zero sequence current amplitude of each line recorded under the second characteristic voltage is a second zero sequence current set;
s3, the controller adjusts the output voltage of the line phase converter to be a third characteristic voltage, and the zero sequence current amplitude of each line recorded under the third characteristic voltage is a third zero sequence current set;
s4, the controller calculates the absolute value of the amplitude difference value of the corresponding circuits of the first zero sequence current set and the second zero sequence current set as a characteristic zero sequence current set;
s5, when all elements in the characteristic zero sequence current set are smaller than the amplitude characteristic threshold value, judging that the bus is grounded; and otherwise, determining that the line corresponding to the maximum element in the characteristic zero sequence current set is a grounding line.
Further, the line phase converter outputs the first compensation voltage to inhibit the voltage and the current of a fault point of the system to be zero when the system is grounded in a single phase, namely the voltage of a fault phase is zero.
Further, in step S2, the second characteristic voltage amplitude is 60% to 95% of the first characteristic voltage.
Further, in step S3, the third characteristic voltage amplitude is 105% -140% of the first characteristic voltage.
Further, the amplitude characteristic threshold value is 1% -10% of the average value of the first zero-sequence current set.
It should be noted that how to acquire the voltage amplitude, the phase, and the like is a mature technology in the industry, and details thereof are not described in the present invention.
The invention has the beneficial effects that:
the invention provides a method for accurately judging a fault line of a ground fault occurrence line by using an obvious effective characteristic value of a difference value between the phase difference of an injected current of a self-generating power supply and a zero-sequence current of the line in the compensation and adjustment process of the self-generating power supply type ground fault compensation system for the first time.
Drawings
FIG. 1 is a schematic diagram of the system of the present invention;
FIG. 2 is a flow chart of a method for selecting a ground fault line of a self-generating power supply type ground fault compensation system according to the present invention;
wherein: the device comprises a line phase converter 1, a fling-cut switch 2, a controller 3 and a voltage and current collector 4.
Detailed Description
While the invention will be described in detail in connection with the drawings and specific embodiments, it should be understood that the described embodiments are only some of the embodiments of the present application, and not all embodiments, and all other embodiments, which can be obtained by those skilled in the art without making any creative effort, based on the embodiments in the present application, belong to the protection scope of the present application.
As shown in fig. 1, the self-generated power supply type ground fault compensation system of the invention includes a line phase-change converter 1, a switching switch 2, a controller 3 and a voltage current collector 4, wherein the line phase-change converter 1 is connected with a bus, the line phase-change converter 1 is connected with the bus and then is connected to a neutral point of the system through a switching switch 2, the voltage current collector 4 is connected in series between the switching switch 2 and the neutral point, an output end of the voltage current collector 4 is connected with an input end of the controller 3, an input end of the controller 3 is connected with a voltage transformer of the bus, and an output end of the controller 3 is respectively connected with the switching switch 2 and an input end of the line phase-change converter 1.
In this embodiment, the line-to-line converter 1 converts the line voltage of the bus into an inverted voltage having the same amplitude and the opposite phase to the voltage of the bus, and the voltage can completely compensate the current at the ground fault point. The controller 3 judges the grounding phase of the bus through the voltage transformer, when a grounding fault occurs, the controller 3 controls the fling-cut switch 2 to close the corresponding phase, and the current of the grounding fault point is completely compensated through the reversed-phase voltage which is output by the line phase converter 1 and is opposite to the voltage phase of the bus and has the same amplitude.
In this embodiment, the line-phase converter includes a phase power supply generator and a power supply phase compensator, the phase power supply generator is coupled in Dy, Zy, Yd, Yy, or Dyn, Zyn, or Yyn.
According to the transformer principle, the phase difference exists between the phase voltage of the power supply phase power generated by the phase power supply generator and the phase voltage of the power supply of the power grid system
And is
Wherein
Phase difference between the line voltage of the phase-fed power generator and the line voltage corresponding to the grid system, n being [0,11 ]]An integer within the range.
The rated voltage of the phase power supply generator has no conflict or influence on the implementation of the invention in principle, but the rated line voltage of the secondary winding of the recommended phase power supply generator is 0.4kV or more and is within the rated voltage of a power grid system by considering the existing mature technology and the more convenient implementation of the technology. But the voltage ratio of the primary winding and the secondary winding of the phase power supply generator is k.
The phase power supply phase compensator compensates phase voltage phase difference generated by the phase power supply generator; the output line voltage and the input line voltage have phase difference
The rated voltage of a primary winding of the phase compensator of the phase power supply generates the rated voltage of a secondary winding for the phase power supply, the rated line voltage of the secondary winding of the phase compensator of the phase power supply is the rated voltage of a power grid system, and the voltage ratio of the primary winding to the secondary winding is 1/k.
For more convenient implementation of the present technology, table 1 shows the connection groups that can be used by some phase power supply generators and the connection groups that should be used by the corresponding phase power supply phase compensators.
TABLE 1 partial phase supply Generator coupling set for use with phase supply phase compensator
Recording that the voltage of the power supply line of the bus is U respectively AB 、U BC 、U CA The phase voltages of the bus power supply are respectively U A 、U B 、U C (ii) a The line voltages output by the phase-recording power supply generator are respectively U ab1 、U bc1 、U ca1 The phase voltages are respectively U a1 、U b1 、U c1 According to the transformer principle, Dy11 is connected with the transformers of the group, the secondary side line voltage is 30 degrees ahead of the primary side voltage, namely the bus line voltage is transmitted by the phase power supply generator 1 and then is transmittedU AB 、U BC 、U CA Converted into phase voltage U a1 、U b1 、U c1 And U is ab1 、U bc1 、U ca1 Phase angle leading U respectively AB 、U BC 、U CA The angle 30 ° is as in formula 1:
the voltage ratio of the primary winding to the secondary winding of the phase power supply generator is k; thus, there is formula 2:
the line voltage output by the phase compensator of the phase-recording power supply is U ab2 、U bc2 、U ca2 The phase voltages are respectively U a2 、U b2 、U c2 Dyn7 is coupled to a group of transformers according to transformer principles with the secondary side line voltage lagging the primary side line voltage by 210, i.e. U ab2 、U bc2 、U ca2 Phase angles lagging U ab1 、U bc1 、U ca1 210 °, can be formulated as equation 3:
the voltage ratio of the primary winding to the secondary winding of the phase compensator of the phase power supply is 1/k, so that the formula 4:
from formulas 1 and 3, formula 5 is obtained:
from equation 2 and equation 4, equation 6 is obtained:
further, as can be seen from equation 7:
in this embodiment, the bus line voltage U AB 、U BC 、U CA U transmitted by phase power supply generator and phase power supply phase compensator ab2 、U bc2 、U ca2 Opposite phase, so that the system bus side phase supply voltage U A 、U B 、U C And U transmitted by the phase power supply generator and the phase power supply phase compensator a2 、U b2 、U c2 Opposite in phase and equal in amplitude.
In this embodiment, as shown in fig. 1, the system includes three outgoing lines, and the single-phase-to-ground distributed capacitances of the line 1, the line 2, and the line 3 are 0.3uF, 0.6uF, and 1.2uF, respectively. The calculation of the data values of the single-phase-to-ground distributed capacitances of the three lines is common knowledge of those skilled in the art, and is not described herein again, at this time, the B phase of the line 3 is grounded in a single phase, the self-generated power supply type grounding compensator performs grounding compensation, and the first characteristic voltage (i.e., the neutral point voltage) output by the compensation system is 5.71 kV. The first zero sequence current sets of the line 1, the line 2 and the line 3 are 1.6A, 3.2A and 6.4A. And taking the characteristic threshold value as 0.56A, wherein 15% of the average value of the first zero sequence current set is taken as the characteristic threshold value. And taking the second characteristic voltage as the first characteristic voltage, wherein 99% of the first characteristic voltage is 5.65kV, and at the moment, the second zero-sequence current set of the line 1, the line 2 and the line 3 is 1.62A, 3.23A and 27.2A. And taking the third characteristic voltage as the first characteristic voltage, wherein 101% of the first characteristic voltage is 5.76kV, and the second zero-sequence current set of the line 1, the line 2 and the line 3 is 1.6A, 3.2A and 6.7A. And the characteristic zero sequence current set is calculated to be 0.02A,0.03A and 20.5A. And since the characteristic zero sequence current corresponding to the line 3 is 20.5A, is greater than the characteristic threshold value and is the maximum value in the characteristic zero sequence current set, the line 3 is determined to be a grounding line.
Although the present invention has been described in detail with reference to the preferred embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted without departing from the spirit and scope of the invention as defined in the appended claims. The techniques, shapes, and configurations not described in detail in the present invention are all known techniques.
Claims (6)
1. The self-generating power supply type ground fault compensation system is characterized by comprising a line phase-change converter (1), a switching switch (2), a voltage and current collector (4) and a controller (3), wherein the line phase-change converter (1) is connected with a bus and then is connected to a neutral point of the system through the switching switch (2), the current collector (4) is connected between the switching switch and the neutral point in series, the output end of the voltage and current collector (4) is connected with the input end of the controller (3), the input end of the controller (3) is connected with a voltage transformer of the bus, and the output end of the controller (3) is connected with the switching switch (2) and the input end of the line phase-change converter (1) respectively;
the controller (3) judges the grounding phase of the bus through the voltage transformer, when a grounding fault occurs, the controller (3) controls the switching switch (2) to close the corresponding phase, and then the line-phase converter (1) changes the line voltage of the bus into an inverse voltage which is opposite to the voltage phase of the bus and has the same amplitude, and the inverse voltage can completely compensate the current of a grounding fault point;
the line-phase converter (1) comprises a phase power supply generator and a power supply phase compensator, wherein the connection form of the phase power supply generator is Dy or Zy or Yd or Yy, the connection form of the phase power supply phase compensator is Dyn or Zyn or Yyn, the phase power supply generator generates a power supply phase power supply by using line voltage of a bus, and the power supply phase power supply is transmitted by the power supply phase compensator and then becomes the reversed-phase voltage with the opposite phase and the same amplitude as the voltage of the bus.
2. A line selection method for a ground fault phase of a self-generated power supply type ground fault compensation system according to claim 1 is specifically executed according to the following steps:
s1, after the system generates single-phase grounding, the line phase-change converter (1) outputs a first compensation voltage to completely compensate grounding current, the voltage current collector (4) records that the current injected into the system by the current line phase-change converter (1) is a first injected current, records that the voltage output by the current line phase-change converter (1) is a first characteristic voltage, and records any line zero-sequence current as a first line zero-sequence current;
s2, the controller (3) adjusts the output voltage of the line phase-change converter (1) to be a second characteristic voltage, and the zero sequence current amplitude of each line recorded under the second characteristic voltage is a second zero sequence current set;
s3, the controller (3) adjusts the output voltage of the line phase converter (1) to be a third characteristic voltage, and the zero sequence current amplitude of each line recorded under the third characteristic voltage is a third zero sequence current set;
s4, the controller (3) calculates the absolute value of the amplitude difference value of the corresponding lines of the first zero-sequence current set and the second zero-sequence current set as a characteristic zero-sequence current set;
s5, the controller judges that the bus is grounded when all elements in the characteristic zero sequence current set are smaller than the amplitude characteristic threshold value; otherwise, the line corresponding to the maximum element in the characteristic zero sequence current set is determined as a grounding line.
3. The line selection method for the ground fault phase of the self-generating power supply type ground fault compensation system according to claim 2, wherein the line phase converter (1) outputs the first compensation voltage to suppress the voltage and current of the fault point of the system to zero when the system is grounded in a single phase, that is, the voltage of the fault phase is zero.
4. The line selection method for the ground fault phase of the self-generating power supply type ground fault compensation system according to claim 2, wherein in step S2, the amplitude of the second characteristic voltage is 60% -95% of the amplitude of the first characteristic voltage.
5. The line selection method for the ground fault phase of the self-generating power supply type ground fault compensation system according to claim 2, wherein in step S3, the amplitude of the third characteristic voltage is 105% -140% of the first characteristic voltage.
6. The line selection method for the ground fault phase of the self-generating power supply type ground fault compensation system according to claim 2, wherein the amplitude characteristic threshold value is 1% -10% of the average value of the first zero-sequence current set.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910992179.6A CN110571779B (en) | 2019-10-18 | 2019-10-18 | Self-generating power supply type ground fault compensation system and fault line selection method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910992179.6A CN110571779B (en) | 2019-10-18 | 2019-10-18 | Self-generating power supply type ground fault compensation system and fault line selection method |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN110571779A CN110571779A (en) | 2019-12-13 |
| CN110571779B true CN110571779B (en) | 2022-08-26 |
Family
ID=68785364
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201910992179.6A Active CN110571779B (en) | 2019-10-18 | 2019-10-18 | Self-generating power supply type ground fault compensation system and fault line selection method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN110571779B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111262251B (en) * | 2020-02-06 | 2023-06-30 | 云南电网有限责任公司电力科学研究院 | Analysis method for voltage drop of full compensation system |
| CN115693630B (en) * | 2023-01-05 | 2023-04-25 | 国网山西省电力公司朔州供电公司 | Hybrid arc extinguishing system based on split winding and working method thereof |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782114A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| SE437096B (en) * | 1984-03-12 | 1985-02-04 | Klaus Winter | DEVICE FOR REDUCING THE EARTH FLOW IN NON-DIRECT POWER |
| CN102684182B (en) * | 2012-05-29 | 2014-10-08 | 广州智光电气股份有限公司 | Arc extinction grounding device |
| CN104319757B (en) * | 2014-11-13 | 2017-06-06 | 中国矿业大学 | The arc suppression coil device and method of active component in compensation single-phase earth fault current |
| CN106655144A (en) * | 2017-02-13 | 2017-05-10 | 云南电网有限责任公司电力科学研究院 | Dual-closed-loop control-based active voltage arc extinction method and apparatus for power distribution network in fault |
| SE541989C2 (en) * | 2017-05-24 | 2020-01-14 | Swedish Neutral Holding Ab | Device and method for earth fault compensation in power grids |
| RU2673799C1 (en) * | 2017-11-17 | 2018-11-30 | Общество с ограниченной ответственностью "НПП Бреслер" (ООО "НПП Бреслер") | Device for automatic compensation of current of single phase-to-earth fault |
| CN108258674A (en) * | 2018-04-10 | 2018-07-06 | 南京南瑞继保电气有限公司 | The singlephase earth fault arc-extinguishing system and method for a kind of small current neutral grounding system |
| CN109521320A (en) * | 2019-01-30 | 2019-03-26 | 云南电网有限责任公司电力科学研究院 | A kind of controllable voltage source compensates phase perturbation selection method entirely |
-
2019
- 2019-10-18 CN CN201910992179.6A patent/CN110571779B/en active Active
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109782114A (en) * | 2019-03-29 | 2019-05-21 | 云南电网有限责任公司电力科学研究院 | A kind of full compensation of ground malfunction method of discrimination of controllable voltage source and system |
Also Published As
| Publication number | Publication date |
|---|---|
| CN110571779A (en) | 2019-12-13 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| WO2021073323A1 (en) | Ground fault current compensation system, method and apparatus for self-produced phase power supply | |
| Wang et al. | A novel neutral electromagnetic hybrid flexible grounding method in distribution networks | |
| Szechtman et al. | A benchmark model for HVDC system studies | |
| CN110729737B (en) | Self-generating power supply ground fault compensation system and fault disappearance judging method | |
| CN110544930B (en) | Voltage drop adjustment system and method based on capacitance current | |
| CN110544929B (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN110544931B (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN110718921A (en) | Voltage regulator setting system and compensation method of ground fault voltage compensation system | |
| CN110571779B (en) | Self-generating power supply type ground fault compensation system and fault line selection method | |
| CN110601206A (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN110571778A (en) | Earth fault current compensation system and method for self-generating power phase power supply | |
| CN110556811A (en) | Power distribution network flexible arc extinction method based on single direct current source cascade H-bridge converter | |
| CN210404755U (en) | Ground fault current compensation system for self-generating power phase power supply | |
| CN110718920B (en) | Voltage sag adjustment system and method based on self-generated power supply phase voltage | |
| Sham et al. | Development of adaptive distance relay for STATCOM connected transmission line | |
| CN109950886B (en) | Control method for controllable current source grounding full compensation with inductance compensation | |
| CN107785915A (en) | A kind of more level active compensation devices of front-end power and control method | |
| Naghshbandy et al. | Blocking DC flux due to geomagnetically induced currents in the power network transformers | |
| CN111106609B (en) | Self-generated power supply phase voltage drop calculation method | |
| CN109921403B (en) | Controllable current source earth fault full compensation method without inductance compensation | |
| Chaudhari et al. | TCSC for protection of transmission line | |
| Pilaquinga et al. | Novel protection schema for a radial microgrid system | |
| CN107785914A (en) | A kind of more level active compensation devices of front-end power and control method | |
| CN112909912A (en) | Power distribution network single-phase earth fault current full-compensation method and device | |
| Walling | Overvoltage protection and arrester selection for large wind plants |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |