CN114268094A - Small power supply island operation identification and connection and disconnection method and device for automatic backup power switching device - Google Patents
Small power supply island operation identification and connection and disconnection method and device for automatic backup power switching device Download PDFInfo
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Abstract
The invention discloses a small power supply island operation identification and connection and disconnection method and device for a spare power automatic switching device, and the small power supply island operation identification and connection and disconnection method for the spare power automatic switching device comprises the following steps: performing electrical quantity characteristic analysis to determine whether the electrical quantity of the substation bus is abnormal; carrying out transformer substation island operation mode identification to determine whether the transformer substation is in an island operation mode; and judging the island operation of the small power supply based on the result of the electric quantity characteristic analysis and the result of the transformer substation island operation mode identification, and controlling a connection switching outlet module of the automatic switching device based on the result of the island operation judgment of the small power supply. The invention can provide a solution for identifying and jointly switching the island operation of the small power supply of the transformer substation, which is efficient, reliable and economical.
Description
Technical Field
The invention relates to a substation standby power supply automatic switching (spare power automatic switching) technology, in particular to a small power supply island operation identification and connection switching method and device for a spare power automatic switching device.
Background
In the operation of a power grid, a substation with a voltage class of 110 kv or below realizes automatic switching between a main power supply and a standby power supply mainly by using a standby power supply automatic switching device (standby power supply automatic switching device) so as to improve the reliability of power supply. The starting and the action of the spare power automatic switching device depend on judging whether the voltage of a bus of the transformer substation is lost or not. However, with the construction of a novel power system, a large number of small power supplies such as wind power, photovoltaic and small hydropower stations are connected into a transformer substation, the load characteristic of the transformer substation is changed, the small power supplies have island operation conditions after faults, the amplitude of bus voltage of the transformer substation cannot fall to a spare power automatic switching action threshold value, and the spare power automatic switching is caused to have a failure risk. This situation becomes more severe as the scale of new energy access increases.
To address this challenge, some of the prior art solutions have been proposed, which have both advantages and disadvantages. For example, chinese patent application No. CN201610662562.1 discloses a method for switching a regional backup power automatic switching system to a small power supply in a connected manner, the method includes acquiring related operation information of a corresponding station line at each station domain control layer of a power grid with a chain structure, setting a regional control layer, determining a fault point of the whole power grid with a chain structure and a position of the small power supply based on the received related operation information, the acquired switch position contact information of the station line and a switched voltage value, and sending a command for switching off the small power supply from the regional control layer to a target station domain control layer, where the station domain control layer responds to the command for switching off the small power supply. In order to identify the position of a small power supply, the method needs to increase the spare power automatic switching of the distribution area on the basis of the spare power automatic switching of the distribution station area of each transformer substation, depends on the spare power automatic switching of the distribution area to communicate with the spare power automatic switching of each station area and controls the action of the spare power automatic switching of the station area, and has high cost, high dependence degree on a communication system and poor reliability. If the Chinese patent document with the application number of CN201811458478.3 discloses a method for reclosing to jointly cut a small power supply, the method judges whether an outgoing line is directly connected with the small power supply by searching a small power line road sign position of the outgoing line connected with a transformer substation, only a breaker of the outgoing line needs to be cut off when the outgoing line is directly connected, an updated command of jointly cutting the small power supply is sent to an adjacent transformer substation, if the outgoing line is not directly connected with the small power supply, the breaker of the outgoing line does not need to act, and if the small power line road sign position of the outgoing line of the adjacent transformer substation is directly connected with the small power supply, the breaker of the outgoing line of the adjacent transformer substation is cut off. The method depends on the correctness of the small power line road sign setting, has no related island monitoring method, and is not suitable for a novel power system containing a large amount of distributed new energy access.
Disclosure of Invention
The technical problems to be solved by the invention are as follows: the invention provides a method and a device for identifying and jointly cutting island operation of a small power supply for a spare power automatic switching device, aiming at the problems in the prior art.
In order to solve the technical problems, the invention adopts the technical scheme that:
a small power supply island operation identification and connection and disconnection method for a spare power automatic switching device comprises the following steps:
performing electrical quantity characteristic analysis to determine whether the electrical quantity of the substation bus is abnormal;
carrying out transformer substation island operation mode identification to determine whether the transformer substation is in an island operation mode;
and judging the island operation of the small power supply based on the result of the electric quantity characteristic analysis and the result of the transformer substation island operation mode identification, and controlling a connection switching outlet module of the automatic switching device based on the result of the island operation judgment of the small power supply.
Optionally, the performing the electrical quantity characteristic analysis includes:
1.1) collecting the electric quantity of a bus of a transformer substation;
1.2) aiming at the collected electric quantity of each transformer substation bus, judging whether the electric quantity of the transformer substation bus is abnormal or not based on a preset standard value or a preset standard value range.
Optionally, the electrical quantity of the substation bus collected in step 1.1) includes voltage information and frequency of the substation bus, the voltage information includes frequency and phase of a voltage signal, and the abnormality of the voltage information includes frequency or phase abnormality of the voltage signal.
Optionally, the step 1.1) of collecting the electrical quantity of the substation bus including the voltage information and the frequency of the substation bus includes: the method comprises the steps of obtaining two-phase direct-current voltage signals under a vector rotation space coordinate system by coordinate transformation of three-phase alternating-current voltage signals of a bus of the transformer substation, obtaining amplitude values of the voltage signals according to direct-current components of the two-phase direct-current voltage signals, obtaining frequency of the voltage signals through a proportional-integral controller of the two-phase direct-current voltage signals, and obtaining phases of the voltage signals after integrating frequency information.
Optionally, the identifying the transformer substation island operation mode includes: the method comprises the steps of collecting a position signal of a high-voltage side power inlet switch of the transformer substation and a current signal corresponding to a switch position, if the position signal of the power inlet switch is in a separated position and the current flowing through the switch is zero, judging that the transformer substation is in a disconnected state with a large power grid, and determining whether the transformer substation is in an isolated island operation mode or not by combining a primary wiring structure of the transformer substation.
Optionally, when the small power supply island operation is judged based on the result of the electrical quantity characteristic analysis and the result of the transformer substation island operation mode identification, the result of the electrical quantity characteristic analysis is an electrical quantity abnormal signal indicating whether the electrical quantity of a transformer substation bus is abnormal, the result of the transformer substation island operation mode identification is a transformer substation island operation mode signal indicating whether a transformer substation is in transformer substation island operation, and the electrical quantity abnormal signal and the transformer substation island operation mode signal are binary 0 or 1 representation signals.
Optionally, the judging of the islanding operation of the small power supply is performed based on the result of the electrical quantity characteristic analysis and the result of the substation islanding operation mode identification, and the controlling of the joint-cutting port module of the automatic switching device based on the result of the islanding operation judgment of the small power supply comprises: and respectively passing each electrical quantity abnormal signal for a time T1 appointed by time delay and then carrying out first OR operation, carrying out second OR operation on the result of the first OR operation and the transformer substation island operation mode signal, and outputting the result of the second OR operation to the gang-cut outlet module as a small power supply gang-cut action signal for controlling the gang-cut outlet module.
In addition, the invention also provides a small power supply island operation identification and linkage switching system for the spare power automatic switching device, which comprises:
the electric quantity characteristic analysis module is used for carrying out electric quantity characteristic analysis;
the transformer substation operation mode identification module is used for identifying the transformer substation operation mode;
and the island operation judgment module is used for judging the island operation of the small power supply based on the result of the electrical quantity characteristic analysis and the result of the transformer substation operation mode identification, and controlling the connection and disconnection outlet module of the automatic switching device based on the result of the island operation judgment of the small power supply.
In addition, the invention also provides a small power supply island operation identification and connection switching device for the automatic backup power switching device, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the small power supply island operation identification and connection switching method for the automatic backup power switching device.
In addition, the invention also provides a computer readable storage medium, which stores steps for being executed by computer equipment to implement the small power supply island operation identification and cut-together method for the automatic backup power switching device.
Compared with the prior art, the invention mainly has the following advantages: the invention discloses a small power supply island operation identification and connection and disconnection method for a spare power automatic switching device, which comprises the following steps: performing electrical quantity characteristic analysis to determine whether the electrical quantity of the substation bus is abnormal; carrying out transformer substation island operation mode identification to determine whether the transformer substation is in an island operation mode; the invention can provide a solution for identifying and jointly switching the island operation of the small power supply of the transformer substation, which is efficient, reliable and economical.
Drawings
FIG. 1 is a schematic diagram of a basic flow of a method according to an embodiment of the present invention.
Fig. 2 is a schematic diagram of the principle of extracting the electrical quantity in the embodiment of the present invention.
Fig. 3 is a schematic diagram of a combined cutting outlet module for controlling the automatic preparation device according to the embodiment of the invention.
Fig. 4 is a schematic structural diagram of a system according to an embodiment of the present invention.
Fig. 5 is a schematic structural diagram of an electrical quantity characteristic analysis module according to an embodiment of the present invention.
Fig. 6 is a schematic diagram of a system operation flow in the embodiment of the present invention.
Detailed Description
The following detailed description of embodiments of the present invention is provided in connection with the accompanying drawings and examples.
It should be understood that the following examples are only for illustrating the present invention, but not for limiting the scope of the present invention. All other embodiments, which can be obtained by a person skilled in the art without any inventive step based on the embodiments of the present invention, are within the scope of the present invention.
As shown in fig. 1, the small power supply island operation identification and connection and disconnection method for the backup power automatic switching device of the embodiment includes:
performing electrical quantity characteristic analysis to determine whether the electrical quantity of the substation bus is abnormal;
carrying out transformer substation island operation mode identification to determine whether the transformer substation is in an island operation mode;
and judging the island operation of the small power supply based on the result of the electric quantity characteristic analysis and the result of the transformer substation island operation mode identification, and controlling a connection switching outlet module of the automatic switching device based on the result of the island operation judgment of the small power supply.
In this embodiment, performing the electrical quantity characteristic analysis includes:
1.1) collecting the electric quantity of a bus of a transformer substation;
1.2) aiming at the collected electric quantity of each transformer substation bus, judging whether the electric quantity of the transformer substation bus is abnormal or not based on a preset standard value or a preset standard value range.
As an optional implementation manner, in this embodiment, the electrical quantity of the substation bus collected in step 1.1) includes voltage information and frequency of the substation bus, where the voltage information includes frequency and phase of a voltage signal, and the abnormality of the voltage information includes an abnormality of the frequency or phase of the voltage signal.
As shown in fig. 2, in the present embodiment, the electrical quantity of the substation bus collected in step 1.1) includes voltage information and frequency of the substation bus: the method comprises the steps of obtaining two-phase direct-current voltage signals under a vector rotation space coordinate system by coordinate transformation of three-phase alternating-current voltage signals of a bus of the transformer substation, obtaining amplitude values of the voltage signals according to direct-current components of the two-phase direct-current voltage signals, obtaining frequency of the voltage signals through a proportional-integral controller of the two-phase direct-current voltage signals, and obtaining phases of the voltage signals after integrating frequency information. When the voltage amplitude of the substation bus is analyzed, when the voltage amplitude of the substation bus is higher than or lower than a set threshold value, the output result based on the electric quantity characteristic analysis is a binary signal 1, otherwise, the output result based on the electric quantity characteristic analysis is a binary signal 0. And analyzing the voltage frequency of the bus of the transformer substation, and when the voltage frequency of the bus is higher than or lower than a set threshold value, outputting a result based on the characteristic analysis of the electrical quantity to be a binary signal 1, otherwise, outputting a result based on the characteristic analysis of the electrical quantity to be a binary signal 0. Referring to fig. 2, the substation bus in this embodiment includes two buses, namely, the I bus and the II bus, and the electrical quantity processing method for the two buses in the method of this embodiment is completely the same.
In this embodiment, identifying the transformer substation island operation mode includes: the method comprises the steps of collecting a position signal of a high-voltage side power inlet wire switch of the transformer substation and a current signal corresponding to a switch position, if the position signal of the power inlet wire switch is in a separated position and the current flowing through the switch is zero, judging that the transformer substation is in a disconnected state with a large power grid, and determining whether the transformer substation is in an island operation mode or not by combining a primary wiring structure of the transformer substation.
In this embodiment, when the small power supply isolated island operation is determined based on the result of the electrical quantity characteristic analysis and the result of the substation isolated island operation mode identification, the result of the electrical quantity characteristic analysis is an electrical quantity abnormal signal indicating whether the electrical quantity of a substation bus is abnormal, the result of the substation isolated island operation mode identification is a substation isolated island operation mode signal indicating whether a substation is in substation isolated island operation, and the electrical quantity abnormal signal and the substation isolated island operation mode signal are binary 0 or 1 representation signals.
As shown in fig. 3, in this embodiment, the small power supply island operation judgment is performed based on the result of the electrical quantity characteristic analysis and the result of the transformer substation island operation mode identification, and the control of the joint-cutting-out die block of the automatic switching device based on the result of the small power supply island operation judgment includes: and respectively passing each electrical quantity abnormal signal for a time T1 appointed by time delay and then carrying out first OR operation, carrying out second OR operation on the result of the first OR operation and the transformer substation island operation mode signal, and outputting the result of the second OR operation to the gang-cut outlet module as a small power supply gang-cut action signal for controlling the gang-cut outlet module.
As shown in fig. 4, the present embodiment further provides a small power supply island operation identification and linkage switching system for a backup power automatic switching device, including:
the electric quantity characteristic analysis module 1 is used for carrying out electric quantity characteristic analysis;
the transformer substation operation mode identification module 2 is used for identifying the transformer substation operation mode;
and the island operation judgment module 3 is used for judging the island operation of the small power supply based on the result of the electrical quantity characteristic analysis and the result of the transformer substation operation mode identification, and controlling the joint cutting-out port module 4 of the automatic switching device based on the result of the island operation judgment of the small power supply.
The electric quantity characteristic analysis module 1 is used for judging whether the abnormality exists according to electric quantity characteristics such as bus voltage, frequency and the like of the transformer substation. As shown in fig. 5, the electrical quantity characteristic analysis module 1 specifically includes a voltage amplitude abnormality determination unit 11, a frequency abnormality determination unit 12, and a voltage amplitude frequency calculation unit 13, and outputs the result to the island operation determination module 3 and the joint cutting port module 4. As shown in fig. 2, this embodiment provides an implementation of a voltage amplitude and frequency calculation unit 13, and the implementation method uses coordinate transformation to implement a change from a three-phase ac signal to a two-phase dc signal in a vector rotation space coordinate system, and further obtains frequency information of the voltage signal through a proportional-integral controller, and obtains voltage phase information after integrating the frequency information. Meanwhile, the voltage amplitude signal can be directly obtained from the direct current component after coordinate transformation.
The transformer substation operation mode identification module 2 is used for acquiring a transformer substation high-voltage side switch position signal and a current signal corresponding to a switch position, judging the specific operation mode of the transformer substation by combining a primary wiring structure of the transformer substation, outputting a result of 1 if the transformer substation operation mode is in an island operation mode, otherwise outputting the result to the island operation judgment module and a combined cutting port module.
The island operation judging module 3 is used for analyzing whether the small power supply is in an island operation state or not by synthesizing the output results of the electric quantity characteristic analysis module and the transformer substation operation mode identification module, the input end of the island operation judging module is connected with the output ends of the electric quantity characteristic analysis module 1 and the transformer substation operation mode identification module 2, and the output end of the island operation judging module is connected with the joint cutting port module 4. In the present embodiment, as shown in fig. 3, a logic structure of the islanding operation determination module 3 is provided, where a voltage abnormal signal and a frequency abnormal signal are subjected to time delay by T1 and then subjected to or logic, an output result of the voltage abnormal signal and a transformer substation islanding operation mode are subjected to or logic, and a final result is subjected to time delay by T2 and then outputs a small power supply gang-cut action signal to the gang-cut port module 4.
The combined cutting-out die block 4 is used for receiving output information of the electric quantity characteristic analysis module 1, the transformer substation operation mode identification module 2 and the island operation judgment module 3, comprehensively judging the position of a small power supply with island operation, and acting to perform combined cutting corresponding to a circuit breaker. This example
It should be noted that the electrical quantity characteristic analysis module 1, the substation operation mode identification module 2, and the island operation judgment module 3 may be implemented by using an independent hardware circuit as needed, or by using a program module as needed.
As shown in fig. 6, the embodiment further provides an application method for island operation identification and linkage switching of a small power supply of a standby power supply auto-switching device, including:
s1) after the program is started, reading a transformer substation switch position signal, line current information and transformer substation bus voltage sampling information, and respectively entering the step a1) and the step b1) after the program is started;
a1) judging whether the specific operation mode of the transformer substation is an island operation mode or not according to the primary structure diagram of the transformer substation, the real-time switch position signal and the incoming line current signal, and if not, continuing to execute the step a 1); if the judgment result is yes, jumping to execute step S2);
b1) the transformer substation bus voltage sampling information is used for decomposing the bus voltage amplitude and the frequency signal, judging whether the voltage amplitude and the frequency signal exceed the threshold value, and if not, continuing to execute the step b 1); if the judgment result is yes, jumping to execute step S2);
s2) carrying out OR logic on the input result, delaying for T2 seconds for output, and jumping to the step S3 after the output is finished);
s3) according to the specific operation mode of the transformer substation or the abnormal condition of the amplitude and frequency of the bus voltage, cutting the corresponding bus small power supply in a linkage manner, and jumping to the step S1) after the cutting is finished.
In summary, the small power supply island operation identification and linkage cutting system for the backup power automatic switching device in the embodiment includes a transformer substation operation mode identification module, an electrical quantity characteristic analysis module, an island operation judgment module and a linkage cutting die module. The transformer substation operation mode identification module realizes automatic judgment of the operation mode of the transformer substation by acquiring the position of a transformer substation switch; the electric quantity characteristic analysis module is used for analyzing the voltage and current information of the transformer substation and judging whether the island operation characteristics are met or not; the island operation judgment module integrates the transformer substation operation mode identification module and the electric quantity characteristic analysis module to output results to judge whether the small power supply operates in an island environment or not; the joint cutting die block is used for realizing joint cutting of a small power supply. The method can effectively realize the identification of the small power supply island operation state, improve the success rate of the spare power automatic switching action through linkage switching, and reduce the risk of power failure of the whole substation. This embodiment is to dual supply series connection power supply transformer substation line fault cause the problem of total station's power loss, provides the mode of switching value signal teletransmission, realizes the cooperative control of stand-by power supply automatic switch-in support system between the series connection power supply transformer substation, makes two station power supply can mutually regard as the stand-by power supply source of offside station, can effectively improve transformer substation's power supply reliability, and this stand-by power supply automatic switch-in cooperative control support system does also independently to regard as the tradition to be equipped with oneself to use, and the equipment commonality is stronger, the economic nature is better.
In addition, the embodiment also provides a small power supply island operation identification and connection switching device for the automatic backup power switching device, which comprises a microprocessor and a memory which are connected with each other, wherein the microprocessor is programmed or configured to execute the steps of the small power supply island operation identification and connection switching method for the automatic backup power switching device.
In addition, the present embodiment also provides a computer-readable storage medium, where steps for being executed by computer equipment to implement the small power source island operation identification and tie-off method for a backup power automatic switching device are stored in the computer-readable storage medium.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-readable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein. The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks. These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only a preferred embodiment of the present invention, and the protection scope of the present invention is not limited to the above embodiments, and all technical solutions belonging to the idea of the present invention belong to the protection scope of the present invention. It should be noted that modifications and embellishments within the scope of the invention may occur to those skilled in the art without departing from the principle of the invention, and are considered to be within the scope of the invention.
Claims (10)
1. A small power supply island operation identification and connection and disconnection method for a spare power automatic switching device is characterized by comprising the following steps:
performing electrical quantity characteristic analysis to determine whether the electrical quantity of the substation bus is abnormal;
carrying out transformer substation island operation mode identification to determine whether the transformer substation is in an island operation mode;
and judging the island operation of the small power supply based on the result of the electric quantity characteristic analysis and the result of the transformer substation island operation mode identification, and controlling a connection switching outlet module of the automatic switching device based on the result of the island operation judgment of the small power supply.
2. The small power island operation identification and connection and disconnection method for the automatic backup power switching device according to claim 1, wherein the performing electrical quantity characteristic analysis comprises:
1.1) collecting the electric quantity of a bus of a transformer substation;
1.2) aiming at the collected electric quantity of each transformer substation bus, judging whether the electric quantity of the transformer substation bus is abnormal or not based on a preset standard value or a preset standard value range.
3. The small power island operation identification and connection and disconnection method for the automatic backup power switching device according to claim 2, wherein the electrical quantity of the substation bus collected in the step 1.1) comprises voltage information and frequency of the substation bus, the voltage information comprises frequency and phase of a voltage signal, and the abnormality of the voltage information comprises frequency or phase abnormality of the voltage signal.
4. The small power island operation identification and connection and disconnection method for the automatic backup power switching device according to claim 3, wherein the step 1.1) of collecting the electrical quantity of the substation bus including the voltage information and the frequency of the substation bus comprises: the method comprises the steps of obtaining two-phase direct-current voltage signals under a vector rotation space coordinate system by coordinate transformation of three-phase alternating-current voltage signals of a bus of the transformer substation, obtaining amplitude values of the voltage signals according to direct-current components of the two-phase direct-current voltage signals, obtaining frequency of the voltage signals through a proportional-integral controller of the two-phase direct-current voltage signals, and obtaining phases of the voltage signals after integrating frequency information.
5. The small power supply island operation identification and connection and disconnection method for the automatic backup power switching device according to claim 1, wherein the identification of the transformer substation island operation mode comprises: the method comprises the steps of collecting a position signal of a high-voltage side power inlet switch of the transformer substation and a current signal corresponding to a switch position, if the position signal of the power inlet switch is in a separated position and the current flowing through the switch is zero, judging that the transformer substation is in a disconnected state with a large power grid, and determining whether the transformer substation is in an isolated island operation mode or not by combining a primary wiring structure of the transformer substation.
6. The small power supply island operation identification and connection and disconnection method for the backup automatic switching device according to claim 1, wherein when the small power supply island operation judgment is performed based on the result of the electrical quantity characteristic analysis and the result of the substation island operation mode identification, the result of the electrical quantity characteristic analysis is an electrical quantity abnormal signal indicating whether the electrical quantity of a substation bus is abnormal, the result of the substation island operation mode identification is a substation island operation mode signal indicating whether a substation is in substation island operation, and the electrical quantity abnormal signal and the substation island operation mode signal are binary 0 or 1 representation signals.
7. The small power supply island operation identification and co-cut method for the backup automatic switching device according to claim 6, wherein the judging of the small power supply island operation based on the result of the electrical quantity characteristic analysis and the result of the substation island operation mode identification, and the controlling of the co-cut port module of the backup automatic switching device based on the result of the small power supply island operation judgment comprises: and respectively passing each electrical quantity abnormal signal for a time T1 appointed by time delay and then carrying out first OR operation, carrying out second OR operation on the result of the first OR operation and the transformer substation island operation mode signal, and outputting the result of the second OR operation to the gang-cut outlet module as a small power supply gang-cut action signal for controlling the gang-cut outlet module.
8. The utility model provides a little power supply island operation is discerned and is cut system jointly for being equipped with automatic switching device which characterized in that includes:
the electric quantity characteristic analysis module is used for carrying out electric quantity characteristic analysis;
the transformer substation operation mode identification module is used for identifying the transformer substation operation mode;
and the island operation judgment module is used for judging the island operation of the small power supply based on the result of the electrical quantity characteristic analysis and the result of the transformer substation operation mode identification, and controlling the connection and disconnection outlet module of the automatic switching device based on the result of the island operation judgment of the small power supply.
9. A small power island operation identification and connection switching device for a spare power automatic switching device, which comprises a microprocessor and a memory which are connected with each other, and is characterized in that the microprocessor is programmed or configured to execute the steps of the small power island operation identification and connection switching method for the spare power automatic switching device according to any one of claims 1-7.
10. A computer-readable storage medium, wherein the computer-readable storage medium stores therein steps for being executed by computer equipment to implement the method for identifying and jointly cutting off small power island operation for a backup power automatic switching device according to any one of claims 1 to 7.
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