CN109361200B - Fault fast switching positioning method and related device and fault isolation system - Google Patents
Fault fast switching positioning method and related device and fault isolation system Download PDFInfo
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- 238000010248 power generation Methods 0.000 description 4
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- 238000005859 coupling reaction Methods 0.000 description 3
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/262—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 involving signal transmission between at least two stations involving transmissions of switching or blocking orders
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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
- G01R31/086—Locating faults in cables, transmission lines, or networks according to type of conductors in power transmission or distribution networks, i.e. with interconnected conductors
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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
- H02H7/261—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 involving signal transmission between at least two stations
- H02H7/263—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 involving signal transmission between at least two stations involving transmissions of measured values
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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
- H02H7/265—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 making use of travelling wave theory
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- H02J3/383—
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- 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
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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- 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 embodiment of the application discloses a fault fast-switching positioning method, a related device and a fault isolation system. The fault fast-switching positioning method comprises the following steps: when detecting that the fault current exists in the line, carrying out fault positioning; sending a holding command with a preset time length to the power electronic equipment containing the photovoltaic to prevent the power electronic equipment containing the photovoltaic from locking; and sending a fault command containing the fault position to a power distribution network protection device so as to cut off the fault current. The problem of current distribution network protection device can't accomplish the judgement, the line selection, the location of trouble at all from the selectivity of time, have feeder trouble mistake grade malfunction's risk is solved.
Description
Technical Field
The application relates to the technical field of power system automation, in particular to a fault fast-switching positioning method, a related device and a fault isolation system.
Background
Renewable energy is an important component of energy supply systems. At present, the development and utilization scale of global renewable energy is continuously enlarged, the application cost is rapidly reduced, the price of a photovoltaic module is reduced by about 60 percent in nearly five years, and the development of renewable energy, especially photovoltaic power generation, becomes the core content of energy transformation promotion and an important way for coping with climate change in many countries. In the national energy planning, strategic targets that non-fossil energy accounts for 15% and 20% of primary energy consumption in 2020 and 2030 are definitely proposed; by the end of 2020, the nationwide solar power generation grid-connected installation can ensure the realization of more than 1.1 hundred million kilowatts.
With the rapid development of renewable energy technologies, particularly the conditions of photovoltaic grid-connected power generation, policy support, market environment and the like, which are gradually mature, a photovoltaic power generation solution is adopted to build generation-transformation-transmission-load in a small area to form an independent power microgrid, so that the loss caused by a long-distance transmission-transformation link can be reduced, and the energy ratio of distributed renewable energy is increased.
The distribution network power supply is used as the last kilometer of the power system, reliable and high-quality electric energy is transmitted, the mission of a straight-face power user is born, and the final value of the power supply system is reflected. Meanwhile, although the distribution network power supply has the characteristics of high overall investment ratio, large engineering quantity, low technical content, complex line-change layout, short power supply radius and the like, the fault line-selection positioning technology adopted by the distribution network system has a larger gap compared with the main network power transmission and transformation equipment.
However, when the photovoltaic power electronic equipment senses that the fault current exceeds a plurality of times of rated overcurrent value, the device can be locked in 10 mu s, and the existing power distribution network protection device needs nearly 100ms from starting to finally isolating the fault. At the moment, the power electronic equipment containing the photovoltaic is locked, and the fault current disappears, so that the judgment, line selection and positioning of the fault cannot be completed at all according to the time selectivity of the conventional distribution network protection device, and the risk of the fault override malfunction of the feeder line fault exists.
Disclosure of Invention
The embodiment of the application provides a fault fast-switching positioning method, a related device and a fault isolation system, and solves the problems that the existing distribution network protection device cannot complete fault judgment, line selection and positioning at all in time selectivity, and the risk of feeder line fault override malfunction exists.
In view of this, the first aspect of the present application provides a method for locating a fault fast switch, including the steps of:
when detecting that the fault current exists in the line, carrying out fault positioning;
sending a holding command with a preset time length to the power electronic equipment containing the photovoltaic to prevent the power electronic equipment containing the photovoltaic from locking;
and sending a fault command containing the fault position to the power distribution network protection device.
Optionally, the preset time length is specifically 150 ms.
Optionally, the performing fault location specifically includes:
and fault positioning is carried out by adopting a traveling wave measurement principle.
Optionally, the traveling wave measurement principle is calculated by the following formula:
wherein, XLThe length of a fault line is shown, and V is the traveling wave speed; c is the speed of light; mu is the relative magnetic permeability of the medium around the line; the relative dielectric coefficient of the medium around the line core; t is1Time for first sensing of the traveling wave; t is2Time for the second sensing of the traveling wave; t is3The time for sensing the traveling wave for the third time; t isNThe time for sensing the traveling wave for the Nth time; t isN-1The time of sensing the traveling wave for the (N-1) th time.
The second aspect of the application provides a fault fast-switching positioning device, which comprises a fault positioning module, a maintaining module and a fault removing module;
the fault positioning module is used for positioning faults when fault current of a line is detected;
the holding module is used for sending a holding command with a preset time length to the power electronic equipment containing the photovoltaic to prevent the power electronic equipment containing the photovoltaic from being locked;
and the fault removing module is used for sending a fault command comprising a fault position to the power distribution network protection device.
A third aspect of the present application provides a fault fast-switching location apparatus, the apparatus comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to perform the steps of the fault snap-off location method according to the first aspect, according to instructions in the program code.
A fourth aspect of the present application provides a computer-readable storage medium for storing program code for performing the method of the first aspect.
A fifth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.
A sixth aspect of the present application provides a fault isolation system, comprising a photovoltaic-containing power electronic device, a distribution network feeder protection device, and a fault fast-switching positioning device as provided in the third aspect above;
and the photovoltaic power electronic equipment, the power distribution network feeder line protection device and the fault quick-switching positioning equipment are in communication connection.
According to the technical scheme, the embodiment of the application has the following advantages:
in the embodiment of the application, a fault fast switching positioning method is provided, and comprises the steps of sending a holding command with a preset time length to photovoltaic-contained power electronic equipment when a fault current of a line is detected, and preventing the photovoltaic-contained power electronic equipment from being locked; carrying out fault location and fault positioning; and sending a fault command to a fault line to cut off fault current. The method and the device solve the problems of rapid line selection and incapability of self-healing of feeder line faults, synchronously complete fault logic judgment and command in the time of locking the components of the power electronic equipment so that the power electronic equipment can be kept in a short time, prevent the components of the power electronic equipment from being locked, achieve the beneficial effects of completing fault judgment, line selection and positioning and avoiding the risk of feed line fault override misoperation. In addition, in another embodiment, the current traveling wave is adopted for distance judgment, so that the distance judgment is not directly related to the impedance and the voltage drop of the power transmission line, and when the method is applied to a power distribution network with a short power supply range, the fault can be well positioned, so that operation and maintenance personnel can quickly find the fault and recover the power supply of the line.
Drawings
FIG. 1 is a flow chart of a method for locating a fault fast-switch in an embodiment of the present application;
FIG. 2 is a schematic structural diagram of a fault fast-switching positioning device in an embodiment of the present application;
fig. 3 is a self-healing logic block diagram of a self-healing criterion system in an embodiment of the present application;
Detailed Description
In order to make the technical solutions of the present application better understood, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The first aspect of the application provides a fault fast-switching positioning method, which solves the problems that the existing distribution network protection device cannot complete fault judgment, line selection and positioning at all in time selectivity, and the risk of feed line fault override malfunction exists.
For easy understanding, please refer to fig. 1, in which fig. 1 is a flowchart of a method of a fault fast-switching positioning method in an embodiment of the present application, specifically:
it will be appreciated that fault location is required when fault current is present on the line.
it can be understood that in the prior art, the photovoltaic power electronic equipment can latch the device within 10 mus after sensing that the fault current exceeds a plurality of times of the rated overcurrent value, and the prior power distribution network protection device needs nearly 100ms from starting to finally isolating the fault. At the moment, the power electronic equipment containing the photovoltaic is locked, and the fault current disappears, so that the judgment, line selection and positioning of the fault cannot be completed at all according to the time selectivity of the conventional distribution network protection device, and the risk of the fault override malfunction of the feeder line fault exists. Therefore, according to the fault fast-switching positioning method provided by the embodiment of the application, when the fault current of the line is detected, the information containing the holding command with the preset time length is sent to the photovoltaic power electronic equipment to prevent the photovoltaic power electronic equipment from being locked. It will be appreciated that the length of time predicted above needs to be greater than the time from start-up to final fault isolation of the power distribution network protection device, for example 150 ms.
And 103, sending a fault command containing the fault position to the power distribution network protection device so as to conveniently cut off the fault current.
And after fault positioning is carried out on the fault, a fault command containing the fault position is sent to the distribution network protection device. Normally, the distribution network protection device completes fault current removal after about 100 ms.
It should be noted that steps 102 and 103 are not limited in chronological order, and the hold command may be transmitted first and then the failure command may be transmitted, or the hold command and the failure command may be transmitted simultaneously. Namely, it is necessary to ensure that the photovoltaic power electronic equipment cannot be locked before the distribution network protection device completes fault current removal.
According to the embodiment of the application, the power electronic equipment containing the photovoltaic can not be locked before the distribution network protection device finishes the fault current removal through fault positioning, a holding command and a fault command, the judgment, line selection and positioning of the fault can be finished, and the risk of feeder line fault override malfunction can not exist.
Furthermore, the fault positioning method can adopt a traveling wave measurement principle to perform positioning. Specifically, the calculation formula of the traveling wave measurement principle is as follows:
wherein V is the traveling wave velocity; c is the speed of light; mu is the relative magnetic permeability of the medium around the line; the relative dielectric coefficient of the medium around the line core; t is1Time for first sensing of the traveling wave; t is2Time for the second sensing of the traveling wave; t is3The time for sensing the traveling wave for the third time; t isNThe time for sensing the traveling wave for the Nth time; t isN-1The time for sensing the traveling wave for the (N-1) th time.
It should be noted that the fault line selection is independent of the material, sectional area and impedance of the transmission line, so that inaccurate and unreliable ranging caused by the influence of transition resistance during fault is avoided. Considering that the power supply range of a distribution network is generally relatively short and is within several kilometers, the traveling wave speed is nearly equal to the light speed, and the required sampling frequency needs to reach more than 100MHz to realize the target that the positioning error is less than 10 meters. This application accords with the actual engineering application of trouble route selection, satisfies the selectivity cooperation that electronic components shutting overflows and protect, can resume the power supply of branch line fast when the maintenance operation personnel later stage is salvageed to the convenient to overhaul.
The current traveling wave is adopted for judgment, the impedance and the voltage drop of the power transmission line are not directly related, and when the fault location method is applied to a power distribution network with a short power supply range, fault location can be better carried out, so that operation and maintenance personnel can quickly find out faults, and the time for restoring line power supply is greatly reduced.
The second aspect of the present application provides a fault quick-cut positioning device.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a fault fast-switching positioning device in an embodiment of the present application, including a fault positioning module 201, a holding module 202, and a fault removing module 203;
the fault positioning module 201 is used for positioning a fault when a fault current exists in a line;
the holding module 202 is used for sending a holding command with a preset time length to the power electronic equipment containing the photovoltaic to prevent the power electronic equipment containing the photovoltaic from locking; (ii) a
And the fault removing module 203 is used for sending a fault command comprising a fault position to the power distribution network protection device so as to remove fault current.
A third aspect of the present application provides a fault fast-switching positioning apparatus, including a processor and a memory:
the memory is used for storing the program codes and transmitting the program codes to the processor;
the processor is configured to execute the fault snap-off location method according to instructions in the program code.
A fourth aspect of the present application provides a computer readable storage medium for storing program code for performing the method of the first aspect described above.
A fifth aspect of the present application provides a computer program product comprising instructions which, when run on a computer, cause the computer to perform the method of the first aspect described above.
The sixth aspect of the present application provides a fault isolation system, which includes a photovoltaic power electronic device, a feeder protection device for a distribution network, and the fault fast-switching positioning device provided in the third aspect.
And the photovoltaic power electronic equipment, the distribution network feeder line protection device and the fault fast-switching positioning equipment are in communication connection.
It should be noted that, when the fault is correctly located by the fault fast-switching locating device, the feeder line protection device of the power distribution network correctly cuts the fault, the fault current disappears, the protection of the fault fast-switching locating device and the photovoltaic power electronic device is started and returned, after the conditions of checking that the line and the bus voltage are restored to normal and the like meet the self-healing criterion (the self-healing logic block diagram of the self-healing criterion system please refer to fig. 3), the self-healing system at the master station end sends a command to the integrated system after a certain time delay, and the feeder line or the corresponding circuit breaker is closed, and the line restores power supply;
if the fault fast-switching positioning equipment is incorrectly cut off or the breaker fails, the fault current still exists, and at the moment, after the delay of the predicted time length, the power electronic equipment containing the photovoltaic locks the power electronic equipment, cuts off the fault current and realizes fault isolation.
After the fault is correctly removed, the fault current disappears, the fault fast-switching positioning self-healing device of the power distribution network and the protection containing photovoltaic power electronic equipment are started and returned, after the conditions that the line and the bus voltage are recovered to be normal and the like are checked to meet the self-healing criterion, a command is sent to the integrated self-healing system by the self-healing system of the main station end through a certain delay, the feeder line or the corresponding circuit breaker is integrated, and the power supply of the line is recovered. If feeder trouble, when the quick switching of trouble location self-healing device excision is incorrect or the circuit breaker refuses to move, fault current still exists, and after above-mentioned 150ms time delay, the power electronic equipment that contains the photovoltaic blocks this power electronic equipment through several mus, cuts off fault current, realizes the isolation of trouble.
It can be clearly understood by those skilled in the art that, for convenience and brevity of description, the specific working processes of the system, the apparatus and the module described above may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
The terms "first," "second," "third," "fourth," and the like in the description of the application and the above-described figures, if any, are used for distinguishing between similar elements and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used is interchangeable under appropriate circumstances such that the embodiments of the application described herein are, for example, capable of operation in sequences other than those illustrated or otherwise described herein. Moreover, the terms "comprises," "comprising," and any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or modules is not necessarily limited to those steps or modules explicitly listed, but may include other steps or modules not expressly listed or inherent to such process, method, article, or apparatus.
In the several embodiments provided in the present application, it should be understood that the disclosed system, apparatus and method may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the modules is merely a logical division, and in actual implementation, there may be other divisions, for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted, or not implemented. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or modules, and may be in an electrical, mechanical or other form.
The modules described as separate parts may or may not be physically separate, and parts displayed as modules may or may not be physical modules, may be located in one place, or may be distributed on a plurality of network modules. Some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of the present embodiment.
In addition, functional modules in the embodiments of the present application may be integrated into one processing module, or each of the modules may exist alone physically, or two or more modules are integrated into one module. The integrated module can be realized in a hardware mode, and can also be realized in a software functional module mode.
The integrated module, if implemented in the form of a software functional module and sold or used as a stand-alone product, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present application may be substantially implemented or contributed to by the prior art, or all or part of the technical solution may be embodied in a software product, which is stored in a storage medium and includes instructions for causing a computer device (which may be a personal computer, a server, or a network device) to execute all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a U-disk, a removable hard disk, a Read-only Memory (ROM), a Random Access Memory (RAM), a magnetic disk or an optical disk, and other various media capable of storing program codes.
The above embodiments are only used for illustrating the technical solutions of the present application, and not for limiting the same; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some technical features may be equivalently replaced; and such modifications or substitutions do not depart from the spirit and scope of the corresponding technical solutions in the embodiments of the present application.
Claims (5)
1. A fault fast-switching positioning method is characterized by comprising the following steps:
when detecting that the fault current exists in the line, adopting a traveling wave measurement principle to carry out fault positioning;
sending a holding command with a preset time length to the power electronic equipment containing the photovoltaic to prevent the power electronic equipment containing the photovoltaic from locking;
sending a fault command containing a fault position to a power distribution network protection device;
the preset time length is specifically 150 ms;
the calculation formula of the traveling wave measurement principle is as follows:
wherein, XLThe length of a fault line is shown, and V is the traveling wave speed; c is the speed of light; mu is the relative magnetic permeability of the medium around the line; the relative dielectric coefficient of the medium around the line core; t is1Time for first sensing of the traveling wave; t is2Time for the second sensing of the traveling wave; t is3The time for sensing the traveling wave for the third time; t isNIs the Nth timeThe time to experience the traveling wave; t isN-1The time of N-1 time sensing the traveling wave, delta t is an intermediate variable,
2. a fault fast-switching positioning device is characterized by comprising a fault positioning module, a maintaining module and a fault removing module;
the fault positioning module is used for positioning faults by adopting a traveling wave measurement principle when the fault current of the line is detected;
the holding module is used for sending a holding command with a preset time length of 150ms to the power electronic equipment containing the photovoltaic to prevent the power electronic equipment containing the photovoltaic from being locked;
the fault removing module is used for sending a fault command comprising a fault position to the power distribution network protection device;
the calculation formula of the traveling wave measurement principle is as follows:
wherein, XLThe length of a fault line is shown, and V is the traveling wave speed; c is the speed of light; mu is the relative magnetic permeability of the medium around the line; the relative dielectric coefficient of the medium around the line core; t is1Time for first sensing of the traveling wave; t is2Time for the second sensing of the traveling wave; t is3The time for sensing the traveling wave for the third time; t isNThe time for sensing the traveling wave for the Nth time; t isN-1The time of N-1 time sensing the traveling wave, delta t is an intermediate variable,
3. a fault snap-off locating device, the device comprising a processor and a memory:
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is configured to execute the fault snap-off location method of claim 1 according to instructions in the program code.
4. A computer-readable storage medium for storing program code for performing the method of fault fast-cut location as claimed in claim 1.
5. A fault isolation system comprising photovoltaic-containing power electronics, distribution network feeder protection, and a fault fast-switching location device according to claim 3;
and the photovoltaic power electronic equipment, the power distribution network feeder line protection device and the fault quick-switching positioning equipment are in communication connection.
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| CN201811469834.1A CN109361200B (en) | 2018-11-26 | 2018-11-26 | Fault fast switching positioning method and related device and fault isolation system |
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| CN201811469834.1A CN109361200B (en) | 2018-11-26 | 2018-11-26 | Fault fast switching positioning method and related device and fault isolation system |
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| CN102709893B (en) * | 2012-06-14 | 2014-12-10 | 国家电网公司 | Method for isolating faults of distributed generation/stored energy-containing microgrid |
| CN103986342B (en) * | 2014-05-29 | 2016-08-24 | 国家电网公司 | A kind of power electronics inverter that can remove bi-directional failure electric current and control method |
| CN105119255B (en) * | 2015-09-25 | 2017-02-15 | 国网山东省电力公司济南供电公司 | Photovoltaic microgrid fault isolation method based on fault state |
| CN109193584B (en) * | 2016-11-14 | 2019-11-05 | 国网江苏省电力公司常州供电公司 | A kind of current protection method of the power distribution network containing distributed photovoltaic power |
| CN107069676B (en) * | 2016-12-09 | 2019-08-20 | 国家电网公司 | Distribution network failure positions and quickly isolates recovery control method |
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