CN111276931B - New energy peripheral alternating current line protection fixed value checking method, system and equipment - Google Patents
New energy peripheral alternating current line protection fixed value checking method, system and equipment Download PDFInfo
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- CN111276931B CN111276931B CN202010100277.7A CN202010100277A CN111276931B CN 111276931 B CN111276931 B CN 111276931B CN 202010100277 A CN202010100277 A CN 202010100277A CN 111276931 B CN111276931 B CN 111276931B
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02H—EMERGENCY PROTECTIVE CIRCUIT ARRANGEMENTS
- H02H3/00—Emergency protective circuit arrangements for automatic disconnection directly responsive to an undesired change from normal electric working condition with or without subsequent reconnection ; integrated protection
- H02H3/006—Calibration or setting of parameters
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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
- H02H7/28—Sectionalised protection of cable or line systems, e.g. for disconnecting a section on which a short-circuit, earth fault, or arc discharge has occured for meshed systems
Abstract
The invention discloses a method, a system and equipment for checking protection fixed value of a new energy peripheral alternating current line,the method comprises the following steps: determining a grid-connected access point of the new energy station, and obtaining a voltage limit value u during fault according to a low-voltage ride through curverefAnd a fault clearing time limit trefFurther calculate the maximum t of the two-stage time constant value of the allowable fault line protection distancemax(ii) a Applying a fault to a peripheral AC line of a grid-connected access point based on a voltage limit u at the time of the faultrefAnd obtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and checking the relay protection distance two-stage time fixed value of the line to be checked. The invention determines the range of the line to be checked by applying a fault to the side plant station step by step upwards, and checks the protection time fixed value of the alternating current line so as to ensure that the protection action time and the fault removal time meet the requirements of a low-voltage ride-through curve and avoid the large-scale unplanned new energy grid disconnection accident caused by the fault of the peripheral alternating current line.
Description
Technical Field
The invention relates to the technical field of power grid relay protection, in particular to a protection fixed value checking method, system and device for a new energy peripheral alternating current circuit.
Background
At present, wind power photovoltaic power generation is more and more widely applied due to the requirement of clean energy, however, after new energy such as wind power photovoltaic and the like is connected to a power grid in a large scale, potential requirements are provided for fault clearing time of peripheral alternating current lines due to the low voltage ride through characteristic of the new energy. When an alternating current transmission line or a station bus near a new energy access point breaks down, the bus voltage of the new energy station can drop. If the action time of the relay protection is long at the moment, the fault removal is slow, the duration time of bus voltage drop of the new energy plant station exceeds the range of a low voltage ride through curve, and the large-scale new energy off-grid accident is caused.
The low voltage ride through curve puts clear requirements both from the control strategy of the new energy power supply and the fault clearing time of the power grid. However, the industry usually only pays attention to the requirement of a new energy power supply, that is, when the voltage of a grid-connected point is in a range above a curve, the photovoltaic power supply and the wind power supply are not allowed to be disconnected (GBT 19963 technical specification for accessing a wind power plant into a power system, and GBT 19964 technical specification for accessing a photovoltaic power plant into the power system), and the requirement of grid-side alternating current protection is neglected. If the action time fixed value of the power grid side relay protection is set unreasonably, the duration of the alternating current line fault is too long, so that the bus voltage of the new energy plant station exceeds the range of the low voltage ride through curve, and large-scale new energy off-grid can be caused.
In summary, in the prior art, the line protection fixed value around the new energy grid-connected point is not checked, and a technical problem of large-scale unplanned new energy offline caused by an ac fault exists.
Disclosure of Invention
The invention provides a method, a system and equipment for checking protection fixed values of a new energy peripheral alternating current line, and solves the technical problem that the large-scale unplanned disconnection of new energy is caused when an alternating current fault occurs because the protection fixed values of the lines around a new energy grid-connected point are not checked in the prior art.
The invention provides a new energy peripheral alternating current line protection fixed value checking method which comprises the following steps:
determining a grid-connected access point A of a new energy station, and acquiring a low-voltage ride through curve;
obtaining the voltage limit value u at fault according to the low voltage ride through curverefFault clearing time limit trefAnd a delay t inherent to the switching operation0；
According to fault clearing time limit trefAnd a delay t inherent to the switching operation0Calculating the maximum value t of the line protection distance two-stage time fixed value of the fault pointmax；
Applying a fault in a peripheral alternating current line of the grid-connected access point A, and calculating the bus voltage of the new energy station; based on the voltage limit u at faultrefObtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and determining the line to be checked;
judging whether the relay protection distance two-stage time fixed value at two sides of the line to be checked is more than or equal to tmax(ii) a If yes, alarming and prompting that the relay protection distance is required to be shortened for two-stage time fixed value; otherwise, the checking is finished.
Preferably, the line protection distance of the fault point is a two-period fixed value maximum value tmaxIs calculated as tmax＝tref-t0。
Preferably, the new energy plant comprises a centralized wind farm and a centralized photovoltaic power plant.
Preferably, the fault applied to the peripheral ac line of the grid-connected access point a includes a three-phase short-circuit fault, a two-phase short-circuit fault, and a single-phase ground fault.
Preferably, the specific process of determining the line to be checked is as follows:
applying a fault to a bus of a plant station on the opposite side of a first-stage line of a new energy plant station grid-connected access point A, and judging whether the bus voltage of the new energy plant station is greater than or equal to uref(ii) a If so, determining that the line to be checked is a first-stage line of the new energy station; otherwise, applying a fault to the bus of the plant station on the opposite side of the second-stage line of the new energy plant station grid-connected access point A, and judging whether the voltage of the bus of the new energy plant station is greater than or equal to u againrefIf yes, determining that the line to be checked is a first-stage line and a second-stage line of the new energy plant station; otherwise, continuing to apply fault to the bus of the side plant station on the next-stage line until the bus point of the new energy plant station is greater than or equal to u after new fault is appliedrefUntil now.
Preferably, the low voltage ride through curve is obtained according to the national standard GBT 19963 technical specification for accessing the wind power plant to the power system and GBT 19964 technical specification for accessing the photovoltaic power plant to the power system.
A new energy peripheral alternating current line protection fixed value checking system comprises a grid-connected access point determining module, a low-voltage curve module, a line to be checked determining module and an alarm prompting module;
the grid-connected access point determining module is used for determining a grid-connected access point of the new energy station;
the low-voltage curve module is used for acquiring a low-voltage ride through curve and obtaining a voltage limit value u during fault according to the low-voltage ride through curverefAnd a fault clearing time limit trefAnd a delay t inherent to the switching operation0And cut off according to the faultTime limit trefAnd a delay t inherent to the switching operation0Calculating the maximum value t of the line protection distance two-stage time fixed value of the fault pointmax；
The line to be checked determining module is used for applying faults to peripheral alternating current lines of the grid-connected access point A and calculating bus voltage of the new energy station; based on the voltage limit u at faultrefObtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and determining the line to be checked;
the alarm prompt module is used for judging whether the relay protection distance two-stage time fixed value at two sides of the line to be checked is more than or equal to tmax(ii) a If yes, alarming and prompting that the relay protection distance is required to be shortened for two-stage time fixed value; otherwise, the checking is finished.
Preferably, the system further comprises a storage module, and the storage module is used for storing data of the system.
Preferably, the system further comprises a display module, and the display module is used for displaying the range of the line to be checked.
A protection fixed value checking device of an alternating current line comprises a processor and a memory;
the memory is used for storing program codes and transmitting the program codes to the processor;
the processor is used for executing the new energy peripheral alternating current line protection fixed value checking method according to the instructions in the program codes.
According to the technical scheme, the invention has the following advantages:
the embodiment of the invention finally determines the range of the line to be checked by applying a fault to the opposite side plant station step by step upwards, then checks the time fixed value of the protection of the alternating current line, and alarms the fixed value of the protection time which does not meet the requirement so as to ensure that the action time of the protection and the fault removal time can meet the requirement of a low-voltage ride-through curve, thereby effectively avoiding the large-scale unplanned offline accident of new energy caused by the fault of the peripheral alternating current line. The method solves the technical problem that the line protection fixed value around the new energy grid connection point is not checked in the prior art, so that the new energy is subjected to large-scale unplanned offline when an alternating current fault occurs, and has guiding significance in practical application.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
Fig. 1 is a flowchart of a method, a system, and an apparatus for checking a protection fixed value of a new energy peripheral ac line according to an embodiment of the present invention.
Fig. 2 is a system structure diagram of a new energy peripheral ac line protection fixed value checking method, system and device according to an embodiment of the present invention.
Fig. 3 is an apparatus structure diagram of a new energy peripheral ac line protection fixed value checking method, system and apparatus according to an embodiment of the present invention.
Fig. 4 is a primary wiring diagram of a new energy station access ac system of a new energy peripheral ac line protection fixed value calibration method, system and device provided in the embodiments of the present invention.
Fig. 5 is a low voltage ride through curve diagram of a new energy peripheral ac line protection fixed value calibration method, system and device according to an embodiment of the present invention.
Detailed Description
The embodiment of the invention provides a method, a system and equipment for checking protection fixed values of new energy peripheral alternating current lines, which are used for solving the technical problem that the large-scale unplanned new energy offline when an alternating current fault occurs because the line protection fixed values around a new energy grid-connected point are not checked in the prior art.
In order to make the objects, features and advantages of the present invention more obvious and understandable, the technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present invention, and it is obvious that the embodiments described below are only a part of the embodiments of the present invention, 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 invention.
Referring to fig. 1, fig. 1 is a flowchart illustrating a method, a system and a device for checking a protection fixed value of a peripheral ac line of new energy according to an embodiment of the present invention.
The invention provides a new energy peripheral alternating current line protection fixed value checking method which comprises the following steps:
determining a grid-connected access point A of the new energy station, and acquiring a low-voltage ride through curve, wherein the curve is shown in FIG. 5;
obtaining the voltage limit value u at fault according to the low voltage ride through curverefFault clearing time limit trefAnd a delay t inherent to the switching operation0(ii) a In this example, take uref＝0.2p.u.，tref＝0.625s、t0＝0.12s。
According to fault clearing time limit trefAnd a delay t inherent to the switching operation0Calculating the maximum value t of the line protection distance two-stage time fixed value of the fault pointmax＝tref-t0＝0.505s；
Applying a fault in a peripheral alternating current line of the grid-connected access point A, and calculating the bus voltage of the new energy station; based on the voltage limit u at faultrefObtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and determining the line to be checked;
the specific process of determining the line to be checked is as follows:
as shown in fig. 4, a fault is applied to the bus of the plant station B on the opposite side of the first-level line of the new energy plant station access point a, and whether the bus voltage of the new energy plant station is greater than or equal to the limit value u is judgedref(ii) a If yes, determining that the line to be checked is a first-stage line of the new energy station: an AB line; otherwise, continuing to upwards step by step, and applying fault on the buses of the plant C and the plant D on the opposite side of the plant BAnd (4) judging whether the bus voltage of the new energy station is greater than or equal to the limit value u againrefIf yes, determining that the line to be checked is a first-stage line and a second-stage line of the new energy station: AB line, BC line and BD line; otherwise, repeating the steps in the same way until the bus voltage of the new energy plant station is more than or equal to the limit value u after the new fault point is appliedrefUntil now. Thus, the range of the line to be checked is determined.
In this embodiment, it is assumed that when a bus of a station B has a fault, the bus voltage of a new energy station a is 0.1p.u., and is less than a limit urefTherefore, the bus voltage of the new energy station A is 0.25p.u. and is larger than the limit value u when the bus of the station C has a faultref(ii) a When the bus of the station D has a fault, the bus voltage of the station A of the new energy source is 0.3p.u., and is also greater than the limit value uref. And at this point, the scanning of the fault point range is finished, and the lines to be checked are determined to be AB lines, BC lines and BD lines.
Judging whether the relay protection distance two-stage time fixed value at two sides of the line to be checked is more than or equal to tmax(ii) a If yes, alarming and prompting that the relay protection distance is required to be shortened for two-stage time fixed value; otherwise, the checking is finished.
In this embodiment, it is assumed that the distance two-stage time setting values of the relay protection devices on both sides of the AB line, BC line, and BD line are tAB＝0.1s、tBC＝0.3s、tBD0.7s, due to tBD>tmaxAnd only alarming the relay protection fixed value of the BD line. That is, when a failure occurs in a certain portion of the BD line, the protection can be operated after 0.7s, and it takes a longer time to remove the failure in addition to the inherent operation time of the switch. And a fault occurring somewhere on the BD line will result in a bus voltage of the new energy plant a below 0.2p.u. According to the low voltage ride through curve of fig. 5, an unplanned outage of the new energy power source of the new energy plant may be caused. (bus fault of station B, bus voltage of new energy station A is 0.1 p.u.; bus fault of station D, bus voltage of new energy station A is 0.3p.u. therefore, when a certain fault occurs on BD line, bus voltage of new energy station A must be between 0.1p.u. and 0.3p.u., therefore, there must be a point on BD line, and when the fault occurs, new energy station ABus voltage of station A is below 0.2 p.u.)
As a preferred embodiment, the new energy plant comprises a centralized wind farm and a centralized photovoltaic power plant.
As a preferred embodiment, the faults applied in the peripheral ac line of the grid-connected access point a include a three-phase short-circuit fault, a two-phase short-circuit fault, and a single-phase ground fault.
As a preferred embodiment, the low-voltage ride through curve is obtained according to the national standard GBT 19963 technical specification of accessing the wind power station to the power system and the national standard GBT 19964 technical specification of accessing the photovoltaic power station to the power system.
As shown in fig. 2, a new energy peripheral ac line protection fixed value checking system includes a grid-connected access point determining module 201, a low voltage curve module 202, a line to be checked determining module 203, and an alarm prompting module 204;
the grid-connected access point determining module 201 is used for determining a grid-connected access point of a new energy station;
the low voltage curve module 202 is configured to obtain a low voltage ride through curve, and obtain a voltage limit u at the time of a fault according to the low voltage ride through curverefAnd a fault clearing time limit trefAnd a delay t inherent to the switching operation0And clearing the time limit t according to the faultrefAnd a delay t inherent to the switching operation0Calculating the maximum value t of the line protection distance two-stage time fixed value of the fault pointmax；
The line to be checked determining module 203 is used for applying a fault in a peripheral alternating current line of the grid-connected access point A and calculating the bus voltage of the new energy station; based on the voltage limit u at faultrefObtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and determining the line to be checked;
the alarm prompt module 204 is used for judging whether the two-stage time setting value of the relay protection distance on two sides of the line to be checked is greater than or equal to tmax(ii) a If yes, alarming and prompting that the relay protection distance is required to be shortened for two-stage time fixed value; otherwise, the checking is finished.
As a preferred embodiment, the system further includes a storage module 205, and the storage module 205 is configured to store data of the system.
As a preferred embodiment, the system further includes a display module 206, and the display module 206 is configured to display a range of the line to be checked.
As shown in fig. 3, a protection fixed value checking device 30 for ac lines includes a processor 300 and a memory 301;
the memory 301 is used for storing a program code 302 and transmitting the program code 302 to the processor;
the processor 300 is configured to execute the steps of the above-mentioned method for checking the new energy peripheral ac line protection fixed value according to the instructions in the program code 302.
Illustratively, the computer program 302 may be partitioned into one or more modules/units that are stored in the memory 301 and executed by the processor 300 to accomplish the present application. The one or more modules/units may be a series of computer program instruction segments capable of performing specific functions, which are used to describe the execution process of the computer program 302 in the terminal device 30.
The terminal device 30 may be a desktop computer, a notebook, a palm computer, a cloud server, or other computing devices. The terminal device may include, but is not limited to, a processor 300, a memory 301. Those skilled in the art will appreciate that fig. 3 is merely an example of a terminal device 30 and does not constitute a limitation of terminal device 30 and may include more or fewer components than shown, or some components may be combined, or different components, e.g., the terminal device may also include input-output devices, network access devices, buses, etc.
The Processor 300 may be a Central Processing Unit (CPU), other general purpose Processor, a Digital Signal Processor (DSP), an Application Specific Integrated Circuit (ASIC), an off-the-shelf Programmable Gate Array (FPGA) or other Programmable logic device, discrete Gate or transistor logic, discrete hardware components, etc. A general purpose processor may be a microprocessor or the processor may be any conventional processor or the like.
The storage 301 may be an internal storage unit of the terminal device 30, such as a hard disk or a memory of the terminal device 30. The memory 301 may also be an external storage device of the terminal device 30, such as a plug-in hard disk, a Smart Media Card (SMC), a Secure Digital (SD) Card, a Flash memory Card (Flash Card), and the like, which are provided on the terminal device 30. Further, the memory 301 may also include both an internal storage unit and an external storage device of the terminal device 30. The memory 301 is used for storing the computer program and other programs and data required by the terminal device. The memory 301 may also be used to temporarily store data that has been output or is to be output.
It is clear to those skilled in the art that, for convenience and brevity of description, the specific working processes of the above-described systems, apparatuses and units may refer to the corresponding processes in the foregoing method embodiments, and are not described herein again.
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 units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. 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 units, and may be in an electrical, mechanical or other form.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
In addition, functional units in the embodiments of the present invention may be integrated into one processing unit, or each unit may exist alone physically, or two or more units are integrated into one unit. The integrated unit can be realized in a form of hardware, and can also be realized in a form of a software functional unit.
The integrated unit, if implemented in the form of a software functional unit 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 invention may be embodied in the form of 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 invention. 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-mentioned embodiments are only used for illustrating the technical solutions of the present invention, and not for limiting the same; although the present invention has been described in detail with reference to the foregoing embodiments, it will 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 of the embodiments of the present invention.
Claims (8)
1. A new energy peripheral alternating current line protection fixed value checking method is characterized by comprising the following steps:
determining a grid-connected access point A of a new energy station, and acquiring a low-voltage ride through curve;
obtaining the voltage limit value u at fault according to the low voltage ride through curverefFault clearing time limit trefAnd a delay t inherent to the switching operation0；
According to fault clearing time limit trefAnd a delay t inherent to the switching operation0Calculating the maximum value t of the line protection distance two-stage time fixed value of the fault pointmax；
Applying faults in peripheral alternating-current lines of the grid-connected access point A, and calculating the bus voltage of the new energy plant station, wherein the faults comprise three-phase short-circuit faults, two-phase short-circuit faults and single-phase ground faults;
based on the voltage limit u at faultrefAnd obtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and determining the line to be checked, wherein the specific process of determining the line to be checked is as follows: applying a fault to a bus of a plant station on the opposite side of a first-stage line of a new energy plant station grid-connected access point A, and judging whether the bus voltage of the new energy plant station is greater than or equal to uref(ii) a If so, determining that the line to be checked is a first-stage line of the new energy station; otherwise, applying a fault to the bus of the plant station on the opposite side of the second-stage line of the new energy plant station grid-connected access point A, and judging whether the voltage of the bus of the new energy plant station is greater than or equal to u againrefIf yes, determining that the line to be checked is a first-stage line and a second-stage line of the new energy plant station; otherwise, continuing to apply fault to the bus of the side plant station on the next-stage line until the bus point of the new energy plant station is greater than or equal to u after new fault is appliedrefUntil the end;
judging whether the relay protection distance two-stage time fixed value at two sides of the line to be checked is more than or equal to tmax(ii) a If yes, alarming and prompting that the relay protection distance is required to be shortened for two-stage time fixed value; otherwise, the checking is finished.
2. The method for checking the protection fixed value of the peripheral AC line of the new energy according to claim 1, wherein the new energy plant station comprises a centralized wind power plant and a centralized photovoltaic power plant.
3. The method of claim 1, wherein the line protection distance two-stage time constant maximum value t of the fault point is the maximum value of the line protection constant value tmaxIs calculated as tmax＝tref-t0。
4. The method for checking the protection fixed value of the peripheral AC line of the new energy according to claim 1, wherein the low voltage ride through curve is obtained according to the national standard GBT 19963 technical Specification for accessing the wind power plant to the electric power system and GBT 19964 technical Specification for accessing the electric power system by the photovoltaic power plant.
5. A new energy peripheral alternating current line protection fixed value checking system is characterized by comprising a grid-connected access point determining module, a low-voltage curve module, a line to be checked determining module and an alarm prompting module;
the grid-connected access point determining module is used for determining a grid-connected access point of the new energy station;
the low-voltage curve module is used for acquiring a low-voltage ride through curve and obtaining a voltage limit value u during fault according to the low-voltage ride through curverefAnd a fault clearing time limit trefAnd a delay t inherent to the switching operation0And clearing the time limit t according to the faultrefAnd a delay t inherent to the switching operation0Calculating the maximum value t of the line protection distance two-stage time fixed value of the fault pointmax；
The line to be checked determining module is used for applying faults to peripheral alternating current lines of the grid-connected access point A and calculating bus voltage of the new energy station; based on the voltage limit u at faultrefAnd obtaining the range of the line to be checked according to the bus voltage of the new energy plant station, and determining the line to be checked, wherein the specific process of determining the line to be checked is as follows: applying a fault to a bus of a plant station on the opposite side of a first-stage line of a new energy plant station grid-connected access point A, and judging whether the bus voltage of the new energy plant station is greater than or equal toIn uref(ii) a If so, determining that the line to be checked is a first-stage line of the new energy station; otherwise, applying a fault to the bus of the plant station on the opposite side of the second-stage line of the new energy plant station grid-connected access point A, and judging whether the voltage of the bus of the new energy plant station is greater than or equal to u againrefIf yes, determining that the line to be checked is a first-stage line and a second-stage line of the new energy plant station; otherwise, continuing to apply fault to the bus of the side plant station on the next-stage line until the bus point of the new energy plant station is greater than or equal to u after new fault is appliedrefUntil the end;
the alarm prompt module is used for judging whether the relay protection distance two-stage time fixed value at two sides of the line to be checked is more than or equal to tmax(ii) a If yes, alarming and prompting that the relay protection distance is required to be shortened for two-stage time fixed value; otherwise, the checking is finished.
6. The system according to claim 5, further comprising a storage module, wherein the storage module is configured to store data of the system.
7. The system according to claim 5, further comprising a display module, wherein the display module is configured to display a range of the line to be checked.
8. The device for checking the protection fixed value of the new energy peripheral alternating current line is characterized by 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 used for executing the new energy peripheral AC line protection fixed value checking method according to any one of claims 1-4 according to instructions in the program codes.
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| US8816535B2 (en) * | 2007-10-10 | 2014-08-26 | Solaredge Technologies, Ltd. | System and method for protection during inverter shutdown in distributed power installations |
| CN102510083B (en) * | 2011-11-07 | 2013-10-23 | 清华大学 | Integration protection method capable of reducing wind power field low-voltage crossing capacity requirement |
| CN102832603B (en) * | 2012-09-18 | 2016-09-07 | 国网山东省电力公司济宁供电公司 | The quick fault of interconnected transmission line partition method that a kind of compatible photovoltaic plant low voltage crossing runs |
| CN108110739B (en) * | 2017-12-27 | 2019-07-26 | 广东电网有限责任公司惠州供电局 | A kind of distribution network line protection definite value check algorithm |
| CN108429246A (en) * | 2018-03-29 | 2018-08-21 | 内蒙古电力勘测设计院有限责任公司 | A kind of wind power plant current collection line protection method and device |
| CN109347144B (en) * | 2018-11-21 | 2022-05-17 | 华北电力大学 | Low voltage ride through method of wind power flexible direct current output system |
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| CN111276931A (en) | 2020-06-12 |
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