CN108469570B - Power grid fault processing method and system based on inverter - Google Patents
Power grid fault processing method and system based on inverter Download PDFInfo
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- 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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- 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
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Abstract
The invention provides a grid fault processing method and a system based on an inverter, wherein the grid fault processing method based on the inverter comprises the following steps: acquiring a current value of an alternating current side of the inverter, and judging whether the current value exceeds a preset current-limiting fixed value or not; when the current value exceeds the current-limiting fixed value, controlling the inverter to send a closing forbidding signal to the bus section switch and entering an active voltage control mode; detecting a voltage detection value of the first section bus, and determining the time of the inverter in an active voltage control mode according to the magnitude relation between the voltage detection value and a preset voltage value; and when the time is less than the preset short-time current limit time, controlling the inverter to cancel the switch-on forbidding signal. By implementing the invention, when the power grid mode fails, the inverter can be effectively protected, and the identification rate of bus faults is increased, so that the expansion of the fault range and the power failure range is prevented, and the operation efficiency of the power grid is further ensured.
Description
Technical Field
The invention relates to the technical field of power equipment, in particular to a power grid fault processing method and system based on an inverter.
Background
In order to improve the power supply reliability, the transformer substation limits the influence caused by faults and maintenance within a certain range, and adopts an isolating switch or a breaker to segment a single bus. In a location where two or more transformers are supplying power, the transformers are not generally allowed to operate in parallel because the internal resistance and reactance of the transformers may not be perfectly identical. In order to prevent accidents, the bus at low voltage is designed to be in a segmented bus running mode, and the segmented switch is normally closed during running. When one transformer needs to be overhauled, the parallel transformers need to be converted into power supply to supply power to the bus. When a power grid fails, the traditional logic of 'three-out-of-two' of the backup power automatic switching or non-voltage switching detection cannot distinguish the fault of a power grid bus for identification, an inverter cannot be effectively protected, and after a certain section of bus is tripped due to the fault, a non-fault bus can be switched on due to the backup power automatic switching section switch, so that the fault range and the power failure range are enlarged.
Disclosure of Invention
The invention aims to solve the technical problem that when a power grid fails in the prior art, the traditional logic of 'three-out-of-two' backup power automatic switching or non-voltage switch-on detection and the like cannot distinguish the power grid bus fault for identification, so that an inverter cannot be effectively protected; and after a certain section of bus is tripped due to a fault, the spare power automatic switching-on section switch can switch on a faultless bus to cause the problems of expansion of a fault range and a power failure range and the like.
According to a first aspect, an embodiment of the present invention provides an inverter-based grid fault handling method, wherein an inverter connects first section buses of a grid through an alternating-current side switch, the first section buses connect second section buses through bus section switches, and the inverter-based grid fault handling method comprises: acquiring a current value of the AC side of the inverter, and judging whether the current value exceeds a preset current-limiting fixed value or not; when the current value exceeds the current-limiting fixed value, controlling the inverter to send a closing forbidding signal to the bus section switch and entering an active voltage control mode; detecting a voltage detection value of the first section bus, and determining the time of the inverter in the active voltage control mode according to the magnitude relation between the voltage detection value and a preset voltage value; and when the time is less than the preset short-time limit current time, controlling the inverter to cancel the switch-on forbidding signal.
With reference to the first aspect, in a first implementation manner of the first aspect, the controlling the inverter to enter an active voltage control mode includes: reducing an output voltage of the inverter to zero; increasing the output voltage to enable the current value to reach the preset current-limiting fixed value; and enabling the inverter to carry out current limiting control according to the current limiting fixed value.
With reference to the first aspect, in a second implementation manner of the first aspect, the determining, according to a magnitude relation between the voltage detection value and a preset voltage value, a time when the inverter is in the active voltage control mode includes: when the voltage detection value is smaller than or equal to the preset voltage value, keeping the inverter in an active voltage control mode; and when the voltage detection value is larger than the preset voltage value, enabling the inverter to exit the active voltage control mode.
With reference to the first aspect, in a third implementation manner of the first aspect, the inverter-based grid fault handling method further includes: and when the time that the inverter is in the active voltage control mode is greater than or equal to the short time limit current time, locking the inverter and disconnecting an alternating current side switch of the inverter.
With reference to the first aspect, in a fourth implementation manner of the first aspect, when the time is less than the short time limit flow time, the fault type is determined to be an outlet fault; and when the time is greater than or equal to the short time limit flow time, determining that the fault type is a bus fault.
According to a second aspect, embodiments of the present invention provide an inverter-based grid fault handling system, the inverter being connected to a first section busbar through an ac-side switch, the first section busbar being connected to a second section busbar through a busbar section switch, the inverter-based grid fault handling system comprising: the current value judging module is used for acquiring a current value of the alternating current side of the inverter and judging whether the current value exceeds a preset current limiting fixed value or not; the switching-on prohibition signal sending module is used for controlling the inverter to send a switching-on prohibition signal to the bus section switch and entering an active voltage control mode when the current value exceeds the current-limiting fixed value; the active voltage control mode time determining module is used for detecting a voltage detection value of the first section bus and determining the time of the inverter in the active voltage control mode according to the magnitude relation between the voltage detection value and a preset voltage value; and the closing forbidding signal cancelling module is used for controlling the inverter to cancel the closing forbidding signal when the time is less than the preset short time limit flow time.
With reference to the second aspect, in a first embodiment of the second aspect, the closing prohibition signal transmission module includes:
the output voltage zero setting submodule is used for reducing the output voltage of the inverter to zero; the output voltage increasing submodule is used for increasing the output voltage so that the current value reaches the preset current-limiting fixed value; and the current limiting control submodule is used for enabling the inverter to carry out current limiting control according to the current limiting fixed value.
With reference to the second aspect, in a second implementation of the second aspect, the active voltage control mode time determination module includes: an active voltage control mode holding sub-module for holding the inverter in an active voltage control mode when the voltage detection value is less than or equal to the preset voltage value; and the active voltage control mode exit submodule is used for enabling the inverter to exit the active voltage control mode when the voltage detection value is larger than the preset voltage value.
With reference to the second aspect, in a third implementation of the second aspect, the inverter-based grid fault handling system further includes: and the inverter control module is used for locking the inverter and disconnecting an alternating current side switch of the inverter when the time of the inverter in the active voltage control mode is greater than or equal to the short current limiting time.
With reference to the second aspect, in a fourth embodiment of the second aspect, when the time is less than the short time limit flow time, the fault type is determined to be an outlet fault; and when the time is greater than or equal to the short time limit flow time, determining that the fault type is a bus fault.
According to a third aspect, embodiments of the present invention provide a non-transitory computer-readable storage medium storing computer instructions for causing a computer to perform the inverter-based grid fault handling method of the first aspect or any one of the alternatives of the first aspect.
According to a fourth aspect, embodiments of the present invention provide a computer program product comprising a computer program stored on a non-transitory computer readable storage medium, the computer program comprising program instructions which, when executed by a computer, cause the computer to perform the method of the first aspect or any one of the alternatives of the first aspect.
The technical scheme of the invention has the following advantages:
according to the embodiment of the invention, the current value of the AC side of the inverter is judged, the inverter is controlled to send the switch-on forbidding signal to the bus section switch, the inverter enters the active voltage control mode, the time in the active voltage control mode is determined according to the voltage detection value of the first section bus, the switch-on forbidding signal is controlled according to the time, and the current of the AC side of the inverter is rapidly reduced when the power grid mode fails, so that the inverter can be effectively protected, the identification rate of bus faults is increased, the expansion of the fault range and the power failure range is prevented, and the operation efficiency of the power grid is ensured.
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 some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic diagram of a wiring structure of an inverter system in a flexible substation according to an embodiment of the present invention;
FIG. 2 is a flow chart of a method for inverter-based grid fault handling in an embodiment of the present invention;
FIG. 3 is a flowchart illustrating operation of the inverter in an active voltage control mode according to an embodiment of the present invention;
FIG. 4 is another flow chart of an inverter-based grid fault handling method in an embodiment of the present invention;
FIG. 5 is another flow chart of an inverter-based grid fault handling method in an embodiment of the present invention;
FIG. 6 is a schematic diagram of a system for handling inverter-based grid faults in an embodiment of the present invention;
FIG. 7 is a schematic diagram of another configuration of an inverter-based grid fault handling system in an embodiment of the present invention;
FIG. 8 is a schematic diagram of another configuration of an inverter-based grid fault handling system in an embodiment of the present invention;
FIG. 9 is a schematic diagram of another configuration of an inverter-based grid fault handling system in an embodiment of the present invention;
fig. 10 is a schematic structural diagram of an electronic device in an embodiment of the invention.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the accompanying drawings, and it should be understood that the described embodiments are some, but not all embodiments of the present invention. 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.
In the description of the present invention, it should be noted that the terms "first" and "second" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it is to be noted that, unless otherwise explicitly specified or limited, the term "connected" is to be interpreted broadly, e.g. as a fixed connection, a detachable connection, or an integral connection; can be mechanically or electrically connected; the two elements may be directly connected or indirectly connected through an intermediate medium, or may be communicated with each other inside the two elements, or may be wirelessly connected or wired connected. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
In addition, the technical features involved in the different embodiments of the present invention described below may be combined with each other as long as they do not conflict with each other.
Example 1
An embodiment of the present invention provides an inverter-based grid fault handling method, and in the embodiment of the present invention, the method may be applied to a grid system as shown in fig. 1, in which an inverter 101 disposed in a flexible substation is connected to a first section bus 103 of a grid through an ac-side switch 102, and the first section bus 103 is connected to a second section bus 105 through a bus section switch 104. As shown in fig. 2, the inverter-based grid fault handling method according to the embodiment of the present invention includes:
step S1: the current value of the AC side of the inverter 101 is obtained, and whether the current value exceeds a preset current limiting fixed value or not is judged.
Step S2: when the current value exceeds the current limit fixed value, the inverter 101 is controlled to send a closing prohibition signal to the bus section switch 104, and the active voltage control mode is entered.
Step S3: and detecting the voltage detection value of the first section bus 103, and determining the time of the inverter 101 in the active voltage control mode according to the magnitude relation between the voltage detection value and the preset voltage value.
Step S4: and when the time in the active voltage control mode is less than the preset short time limit current time, controlling the inverter 101 to cancel the closing forbidding signal.
Through the steps S1 to S4, the inverter-based grid fault handling method according to the embodiment of the present invention can effectively protect the inverter and increase the bus fault recognition rate when the grid mode fails, thereby preventing the fault range and the power outage range from being expanded, and further ensuring the operation efficiency of the grid.
The inverter-based grid fault handling method according to the embodiment of the present invention is further described below with reference to specific examples.
In practical applications, the inverter 101 is one of the main devices in the flexible substation, and realizes the conversion between AC and DC, i.e. it can be realized in the form of a multi-port power electronic transformer, and it can also adopt a conventional DC/AC inverter. As shown in fig. 1, an ac port of an inverter 101 is connected to a first segment bus 103 via an ac-side switch 102, and the first segment bus 103 is connected to a second segment bus 105 via a bus segment switch 104. The first section bus 103 is connected with N feeder lines, each feeder line is connected with a corresponding load, and is connected with the first section bus 103 through a respective feeder switch; the second segmented bus 105 is powered by other power sources, such as a superior power grid, through a conventional transformer series control switch 106 to power the second segmented bus 105. The second segmented bus bar 105 also supplies power to a plurality of loads through feeder switches. When the system normally operates, the control switch 106 and the alternating current side switch 102 are closed, the bus section switch 104 is opened, and each feeder line switch is closed.
Specifically, in an embodiment, in the step S1, the current value of the ac side of the inverter 101 is obtained, and whether the current value exceeds a preset current limit fixed value is determined, where the preset current limit fixed value is a current limit fixed value comprehensively set according to the system short-circuit current of the inverter 101 and the design level of the inverter 101.
In a preferred embodiment, in step S2, when the current value exceeds the current limit fixed value, the controlling inverter 101 sends a closing prohibition signal to the bus-bar section switch 104, and enters the active voltage control mode to prevent the bus-bar section switch 104 from closing in case of a fault, as shown in fig. 3, where the controlling inverter 101 enters the active voltage control mode includes:
step S21: reducing the output voltage of inverter 101 to zero.
Step S22: and increasing the output voltage to enable the current value to reach a preset current-limiting fixed value.
Step S23: the inverter 101 is current-limited in accordance with the current-limiting constant value.
In a preferred embodiment, as shown in fig. 4, the step S3 of detecting the voltage detection value of the first section bus 103 and determining the time when the inverter 101 is in the active voltage control mode according to the magnitude relationship between the voltage detection value and the preset voltage value specifically includes:
step S31: when the voltage detection value is less than or equal to the preset voltage value, the inverter 101 is kept in the active voltage control mode. At this time, the voltage on the first segment bus 103 has not been restored, indicating that the fault still exists, and in order to avoid the inverter 101 from being damaged by overcurrent, it is necessary to keep the inverter 101 in the active voltage control mode.
Step S32: when the voltage detection value is greater than the preset voltage value, the inverter 101 is caused to exit the active voltage control mode. At this time, the voltage on the first segment bus 103 returns to normal, which indicates that the fault is resolved, so the inverter 101 can exit the active voltage control mode and return to the normal operating mode.
Specifically, in an embodiment, in the step S4, when the time that the inverter 101 is in the active voltage control mode is less than a preset short time limit flowing time, which is determined by considering a certain time margin according to the trip time of the feeder switch, the inverter 101 is controlled to cancel the switch-on prohibition signal. When a fault occurs in a feeder line, a feeder line switch is switched from closed to open, the power supply of the feeder line is cut off, but the feeder line switch cannot be immediately completed from closed to open in the actual work, a certain tripping time is needed, and when the time in the active voltage control mode is less than the tripping time, the power grid system is restored to be normal, so that a closing forbidding signal can be cancelled, and because the power grid can be restored to be normal within the time limit, the fault which occurs can be judged to belong to an outgoing line fault.
In a preferred embodiment, as shown in fig. 5, the method for processing a grid fault based on the inverter 101 further includes:
step S5: when the time that the inverter 101 is in the active voltage control mode is greater than or equal to the short time limit current time, the inverter 101 is latched and the ac side switch 102 of the inverter 101 is turned off. If the feeder line fails, the feeder line switch is switched from closed to open, the power supply of the feeder line is cut off, but the feeder line switch cannot be immediately completed from closed to open in the actual work, a certain tripping time is needed, when the time in the active voltage control mode is greater than or equal to the tripping time, the power grid system does not recover to be normal, and the power grid system does not have an outgoing line fault, the fault can be judged to belong to a bus fault.
In a preferred embodiment, when the time is less than the short time limit flow time, the fault type is determined as an outlet fault; and when the time is greater than or equal to the short time limit flow time, determining the fault type as the bus fault.
In practical applications, the application process of the grid fault handling method based on the inverter 101 is as follows:
as shown in fig. 1, when the inverter 101 operates normally, the inverter 101 receives a command of local or superior control, operates in a normal off-grid control mode, and supplies power to the inverter 101 connected to the first section bus 103 on the ac side. When an outgoing line fault occurs, for example, a feeder where the feeder switch 107 is located has a fault, the current value of the alternating current side of the inverter 101 detects an overcurrent, and immediately enters an active voltage control mode, the voltage is reduced to be near zero, the converter valve is prevented from being locked due to overlarge current, meanwhile, a closing prohibition signal is sent to the bus section switch 104, and the bus section switch 104 is prevented from being closed when the feeder has the fault; the inverter 101 is switched to the current limiting control, ramp up the ac voltage until the current reaches a predetermined current limiting constant value, and then perform the current limiting control at the current limiting constant value.
Within a preset short time limit current time, the feeder switch 107 is switched off, a fault point is cut off, at the moment, the voltage of the first section bus 103 rises back under the current limiting control of the inverter 101, when the voltage detection value of the first section bus 103 is higher than a preset voltage value, the inverter 101 exits the active voltage control mode, the normal off-grid control mode is recovered, and meanwhile, a signal for forbidding the bus section switch 104 to be switched on is cancelled.
When a fault occurs in the first section bus 103 as shown in fig. 1, the current on the ac side of the inverter 101 also detects an overcurrent, the inverter 101 enters an active voltage control mode, and the inverter 101 performs current limit control. When a permanent fault of the first section bus 103 occurs, because the fault is not isolated all the time, after the time for entering the active voltage control mode exceeds the preset short time limit flow time, the inverter 101 is locked, the alternating current side switch 102 is disconnected, and a closing signal for forbidding the bus section switch 104 is sent.
In practical application, due to reasons such as the design of an opening and closing circuit of the sectional bus switch 104, repeated action signals which can not continuously receive a closing prohibition signal and cancel the closing prohibition signal in a short time may exist, and at this time, the judgment delay of the bus sectional switch 104 for detecting the bus non-pressure closing can be increased, so that the judgment delay is longer than the active voltage control setting time of the inverter 101; when the inverter 101 enters the initial stage of the active voltage control mode, the closing prohibition signal of the bus section switch 104 is not sent, and only when the first section bus 103 is judged to have a permanent fault after the active voltage control exceeds a preset short time limit flow time, the closing prohibition signal is sent to the section bus switch 104, the inverter 101 is locked, and the alternating current side switch 102 is disconnected.
Through the steps S1 to S5, the inverter-based grid fault handling method according to the embodiment of the present invention can effectively protect the inverter and increase the bus fault recognition rate when the grid mode fails, thereby preventing the fault range and the power outage range from being expanded, and further ensuring the operation efficiency of the grid.
Example 2
An embodiment of the present invention provides an inverter-based grid fault handling system, as shown in fig. 6, the inverter-based grid fault handling system includes: the current value judging module 1 is used for acquiring a current value of an alternating current side of the inverter and judging whether the current value exceeds a preset current limiting fixed value or not; the switching-on prohibition signal sending module 2 is used for controlling the inverter to send a switching-on prohibition signal to the bus section switch and entering an active voltage control mode when the current value exceeds the current-limiting fixed value; the active voltage control mode time determining module 3 is used for detecting a voltage detection value of the first section bus and determining the time of the inverter in the active voltage control mode according to the magnitude relation between the voltage detection value and a preset voltage value; and the closing forbidding signal cancelling module 4 is used for controlling the inverter to cancel the closing forbidding signal when the time is less than the preset short time limit flow time.
Through the cooperative work among the components, the inverter-based power grid fault processing system provided by the embodiment of the invention can effectively protect the inverter when the power grid mode fails, and increases the identification rate of bus faults, so that the expansion of a fault range and a power failure range is prevented, and the operation efficiency of a power grid is further ensured.
The inverter-based grid fault handling system according to the embodiments of the present invention is further described with reference to specific examples.
Specifically, in an embodiment, the current value determining module 1 is configured to obtain a current value at an ac side of the inverter, and determine whether the current value exceeds a preset current-limiting fixed value, where the preset current-limiting fixed value is a current-limiting fixed value comprehensively set according to a short-circuit current of the inverter system and a design level of the inverter.
In a preferred embodiment, the closing prohibition signal sending module 2 is configured to, when the current value exceeds the current limit fixed value, control the inverter to send a closing prohibition signal to the bus section switch, and enter the active voltage control mode to prevent the bus section switch from closing in case of a fault, as shown in fig. 7, where the closing prohibition signal sending module 2 includes:
an output voltage zero setting submodule 21 for reducing the output voltage of the inverter to zero;
the output voltage increasing submodule 22 is used for increasing the output voltage so that the current value reaches a preset current limiting fixed value;
and a current limiting control submodule 23, configured to enable the inverter to perform current limiting control according to the current limiting fixed value.
In a preferred embodiment, as shown in fig. 8, the active voltage control mode time determination module 3 includes: an active voltage control mode holding submodule 31, configured to hold the inverter in an active voltage control mode when the voltage detection value is less than or equal to a preset voltage value; the active voltage control mode exit submodule 32 is configured to exit the inverter from the active voltage control mode when the voltage detection value is greater than the preset voltage value.
Specifically, in an embodiment, the closing prohibition signal cancellation module 4 is configured to control the inverter to cancel the closing prohibition signal when the time is less than a preset short time limit flowing time, where the preset short time limit flowing time is determined by considering a certain time margin according to a tripping time of the feeder switch.
In a preferred embodiment, as shown in fig. 9, the inverter-based grid fault handling system further includes: and the inverter control module 5 is used for locking the inverter and disconnecting an AC side switch of the inverter when the time that the inverter is in the active voltage control mode is greater than or equal to the short time limit current time.
In a preferred embodiment, when the time is less than the short time limit flow time, the fault type is determined as an outlet fault; and when the time is greater than or equal to the short time limit flow time, determining the fault type as the bus fault.
Through the cooperative work among the components, the inverter-based power grid fault processing system provided by the embodiment of the invention can effectively protect the inverter when the power grid mode fails, and increases the identification rate of bus faults, so that the expansion of a fault range and a power failure range is prevented, and the operation efficiency of a power grid is further ensured.
Example 3
Embodiments of the present invention provide a non-transitory computer storage medium storing computer-executable instructions that can execute the inverter-based grid fault handling method of any of embodiments 1 above. The storage medium may be a magnetic disk, an optical disk, a Read-Only Memory (ROM), a Random Access Memory (RAM), a Flash Memory (Flash Memory), a hard disk (hard disk Drive, abbreviated as HDD), a Solid State Drive (SSD), or the like; the storage medium may also comprise a combination of memories of the kind described above.
Those skilled in the art will appreciate that all or part of the processes of the methods of the embodiments described above can be implemented by hardware related to instructions of a computer program, which can be stored in a computer readable storage medium, and when executed, the processes of the embodiments of the methods described above can be included. The storage medium may be a magnetic disk, an optical disk, a read-only memory (ROM), a Random Access Memory (RAM), or the like.
Example 4
An embodiment of the present invention provides an electronic device for a grid fault handling method based on an inverter, a schematic structural diagram of which is shown in fig. 10, and the device includes: one or more processors 410 and a memory 420, with one processor 410 being an example in fig. 10.
The electronic device performing the inverter-based grid fault handling method may further include: an input device 430 and an output device 440.
The processor 410, the memory 420, the input device 430, and the output device 440 may be connected by a bus or other means, such as the bus connection shown in fig. 10.
The memory 420 is a non-transitory computer readable storage medium, and can be used to store non-transitory software programs, non-transitory computer executable programs, and modules, such as program instructions/modules corresponding to the inverter-based grid fault handling method in the embodiment of the present application, and the processor 410 executes various functional applications and data processing of the server by running the non-transitory software programs, instructions, and modules stored in the memory 420, so as to implement the inverter-based grid fault handling method in the above method embodiment.
The memory 420 may include a storage program area and a storage data area, wherein the storage program area may store an operating system, an application program required for at least one function; the storage data area may store data created from use of the processing device debugged by the chip trace, and the like. Further, the memory 420 may include high speed random access memory, and may also include non-transitory memory, such as at least one magnetic disk storage device, flash memory device, or other non-transitory solid state storage device. In some embodiments, memory 420 optionally includes memory located remotely from processor 410, which may be connected to the inverter-based grid fault handling device via a network. Examples of such networks include, but are not limited to, the internet, intranets, local area networks, mobile communication networks, and combinations thereof.
The input device 430 may receive input numeric or character information and generate key signal inputs related to user settings and function control related to the processing device of the inverter-based grid fault handling operation. The output device 440 may include a display device such as a display screen.
One or more modules are stored in the memory 420, which when executed by the one or more processors 410 perform the methods illustrated in fig. 1-5.
The product can execute the method provided by the embodiment of the invention, and has corresponding functional modules and beneficial effects of the execution method. For details of the embodiments of the present invention, reference may be made to the description of the embodiments shown in fig. 1 to 5.
It should be understood that the above examples are only for clarity of illustration and are not intended to limit the embodiments. Other variations and modifications will be apparent to persons skilled in the art in light of the above description. And are neither required nor exhaustive of all embodiments. And obvious variations or modifications therefrom are within the scope of the invention.
Claims (10)
1. An inverter-based grid fault handling method, wherein an inverter is connected to a first sectional bus of a grid through an alternating current side switch, and the first sectional bus is connected to a second sectional bus through a bus sectional switch, the method comprising:
acquiring a current value of the AC side of the inverter, and judging whether the current value exceeds a preset current-limiting fixed value or not;
when the current value exceeds the current-limiting fixed value, controlling the inverter to send a closing forbidding signal to the bus section switch and entering an active voltage control mode;
detecting a voltage detection value of the first section bus, and determining the time of the inverter in the active voltage control mode according to the magnitude relation between the voltage detection value and a preset voltage value, wherein the step of keeping the inverter in the active voltage control mode when the voltage detection value is smaller than or equal to the preset voltage value is included; when the voltage detection value is larger than the preset voltage value, enabling the inverter to exit the active voltage control mode;
and when the time is less than a preset short-time-limit flow time, controlling the inverter to cancel the switch-on forbidding signal, wherein the preset short-time-limit flow time is determined by considering a certain time margin according to the tripping time of the feeder switch.
2. The inverter-based grid fault handling method of claim 1, wherein the controlling the inverter into an active voltage control mode comprises:
reducing an output voltage of the inverter to zero;
increasing the output voltage to enable the current value to reach the preset current-limiting fixed value;
and enabling the inverter to carry out current limiting control according to the current limiting fixed value.
3. The inverter-based grid fault handling method of claim 1, further comprising:
and when the time that the inverter is in the active voltage control mode is greater than or equal to the short time limit current time, locking the inverter and disconnecting an alternating current side switch of the inverter.
4. The inverter-based grid fault handling method of claim 3, wherein when the time is less than the short time-limited flow time, the fault type is determined to be an outlet fault; and when the time is greater than or equal to the short time limit flow time, determining that the fault type is a bus fault.
5. An inverter-based grid fault handling system, the inverter being connected to a first sectionalized bus by an AC-side switch, the first sectionalized bus being connected to a second sectionalized bus by a bus sectionalizing switch, the system comprising:
the current value judging module (1) is used for acquiring a current value of the alternating current side of the inverter and judging whether the current value exceeds a preset current limiting fixed value or not;
the closing forbidding signal sending module (2) is used for controlling the inverter to send a closing forbidding signal to the bus section switch and entering an active voltage control mode when the current value exceeds the current limiting fixed value;
an active voltage control mode time determination module (3) for detecting a voltage detection value of the first section bus, and determining the time of the inverter in the active voltage control mode according to a magnitude relation between the voltage detection value and a preset voltage value, wherein the active voltage control mode time determination module (3) comprises:
an active voltage control mode holding sub-module (31), the active voltage control mode holding sub-module (31) being configured to hold the inverter in an active voltage control mode when the voltage detection value is less than or equal to the preset voltage value;
an active voltage control mode exit submodule (32), wherein when the voltage detection value is larger than the preset voltage value, the active voltage control mode exit submodule (32) is used for enabling the inverter to exit the active voltage control mode;
and the closing forbidding signal cancelling module (4) is used for controlling the inverter to cancel the closing forbidding signal when the time is less than the preset short time limit flow time, and the preset short time limit flow time is the short time limit flow time determined by considering a certain time margin according to the tripping time of the feeder switch.
6. The inverter-based grid fault handling system according to claim 5, wherein the switching-on-prohibition signaling module (2) comprises:
an output voltage zero setting submodule (21) for reducing the output voltage of the inverter to zero;
the output voltage increasing submodule (22) is used for increasing the output voltage so that the current value reaches the preset current limiting fixed value;
and the current limiting control submodule (23) is used for enabling the inverter to carry out current limiting control according to the current limiting fixed value.
7. The inverter-based grid fault handling system of claim 5, further comprising:
an inverter control module (5), when the time that the inverter is in the active voltage control mode is larger than or equal to the short time limit current time, the inverter control module (5) is used for locking the inverter and disconnecting the alternating current side switch of the inverter.
8. The inverter-based grid fault handling system of claim 7, wherein when the time is less than the short time limit flow time, the fault type is deemed to be an outgoing line fault; and when the time is greater than or equal to the short time limit flow time, determining that the fault type is a bus fault.
9. A non-transitory computer readable storage medium storing computer instructions that, when executed by a processor, implement the inverter-based grid fault handling method of any of claims 1-4.
10. An electronic device, comprising:
at least one processor; and
a memory communicatively coupled to the at least one processor; wherein the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the inverter-based grid fault handling method of any of claims 1-4.
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