A phase identification method based on software topology function

Abstract

The present invention provides a phase identification method based on software topology function. When performing the topology function, the phase identification function is turned on, and the phase difference of the channel to be measured is determined by comparing with the reference A phase voltage. The beneficial effects of the present invention are: relying on the topology function, but without increasing the hardware investment related to the topology, only relying on software to simulate the topology process, adding related topology records, and no additional economic expenditure; the present invention can realize the positioning of the equipment at the end of the power distribution, which is conducive to realizing the automation and transparent management of the distribution network.

Description

Technical Field

[0001] The invention belongs to the low-voltage field of power system distribution network, and in particular relates to a phase identification method based on software topology function. Background Art

[0002] The distribution substation is an important part of the smart distribution network, which brings new challenges to the power quality, power supply reliability, economic operation and other aspects of the distribution substation. At present, compared with the level of intelligent construction of transmission and medium-voltage distribution networks, the level of automation and intelligent construction of low-voltage distribution networks lags behind, which is the weak link in the intelligent construction of power grids. The management methods are relatively simple, and there is a lack of intelligent means to manage the low-voltage distribution network in an overall, effective and precise manner. Therefore, the company's overall low-voltage operation and maintenance management urgently needs a technology that can achieve observable and measurable low-voltage distribution substations and support the overall operation and maintenance management needs.

[0003] At present, the topological function of low-voltage substations has developed rapidly and has gradually taken shape, greatly improving the automation level of low-voltage distribution networks. However, considering the economic investment, most topological devices are installed around relatively important circuit breakers. However, for some terminal devices such as meter boxes, especially the air switch side, if topological devices are installed, it will increase the waste of resources. Most of the users in the low-voltage distribution network are single-phase users. The accurate phase relationship of users in the substation is the basis for line loss analysis, fault diagnosis, three-phase balance and other application functions, which is crucial to improving power supply reliability and power supply service capabilities.

[0004] In order to solve the above phenomenon and problems, the present invention discloses a phase identification method based on software topology function, which can realize the positioning of low-voltage air switches, voltage comparison judgment and real-time status update of live operation under the premise of reducing economic expenditure, greatly improving the transparent management of low-voltage substations. Summary of the invention

[0005] In view of this, the present invention aims to propose a phase identification method based on software topology function to solve at least one problem existing in the above-mentioned prior art.

[0006] To achieve the above object, the technical solution of the present invention is achieved as follows:

[0007] A phase identification method based on software topology function comprises the following steps:

[0008] S1. After receiving the topology trigger function from the master station or operation and maintenance personnel, the management and measurement unit starts the phase identification function;

[0009] S2. After the phase identification function is turned on, wait for the arrival of the rising edge signal of the reference A phase voltage zero crossing point, turn on the millisecond timing sampling function, and clear the sampling time;

[0010] S3, after the millisecond timed sampling is turned on, the voltage level at the output of the voltage comparison circuit is collected regularly, and the sampling time is recorded in real time;

[0011] S4. When the sampling data at the output of the voltage comparison circuit is 1, and the phase of the channel to be tested has not been determined, the sampling time at this moment is compared with the determination limit. If the sampling time is within 6 milliseconds, it is determined that the phase of the channel to be tested is the A-phase voltage channel, and the current round of channel phase identification process is exited;

[0012] If the sampling time is within 13 milliseconds, it is determined that the channel to be tested is the B-phase voltage channel;

[0013] The remaining channels to be tested whose sampling data is 1 are determined to be C-phase voltage channels;

[0014] For the channels that have been identified, exit the current round of channel identification process and save the results;

[0015] S5, after a round of channel cycle determination is completed, if there are channels that have not been identified, repeat steps S2, S3, and S4 to perform the next round of missing check and gap filling;

[0016] S6. After step S5 is completed, in order to increase the recognition accuracy of each phase, steps S2, S3, S4 and S5 are repeated, which can be repeated 2 more times or set according to user needs;

[0017] S7. Finally, based on the statistical results, arbitration determines the phase difference of each channel and writes the phase difference into the topology record for operation and maintenance personnel to read and analyze.

[0018] Furthermore, the software topology function is applied to the low-voltage user terminal. Through the topology function simulated by the software, it will not add new topology-related economic expenditures. It only records the topology generation signals and topology recording data through the software, and will not affect the normal topology function.

[0019] Furthermore, the management and measurement unit includes a management and control module and a collection and monitoring module with integrated phase identification function;

[0020] The control module is used to communicate with the main station, manage the connected air switches, and perform data analysis and storage; it is responsible for the identification of air switches and real-time monitoring of power outage operation status;

[0021] The acquisition monitoring module includes a voltage comparison circuit, which is a circuit that compares an external voltage with a set voltage;

[0022] When the external voltage is greater than the set voltage, the circuit output is a high level greater than 3.0V, and the data collected by the control module is 1;

[0023] When the external voltage is lower than the set voltage, the circuit output is a low level lower than 3.0V, and the data collected by the control module is 0;

[0024] The acquisition monitoring module is used to connect to the outlet voltage of the air switch to be tested downward and to connect to the control module upward.

[0025] Furthermore, phase discrimination needs to consider whether there is an abnormality in the line voltage. Only when the line voltage is normal, the phase discrimination result is more reliable. The steps for judging line power outage are as follows:

[0026] A1. The control module collects the voltage status of the air switch in a 1ms cycle. A sampling amplitude of 1 is considered to be energized on the air switch, and a sampling amplitude of 0 is considered to be de-energized on the air switch.

[0027] A2. When the number of sampling points reaches 20, calculate the total amplitude and set it as the amplitude of the cycle;

[0028] A3. Compare the cycle amplitude with the set threshold. If the cycle amplitude is lower than the set threshold and lasts for 3s, it is determined that the air switch has a power outage.

[0029] An electronic device comprises a processor and a memory connected to the processor for storing instructions executable by the processor, wherein the processor is used to execute the above-mentioned phase identification method based on software topology function.

[0030] A server includes at least one processor and a memory connected to the processor in communication, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor to enable the at least one processor to perform the phase identification method based on software topology function.

[0031] A computer-readable storage medium stores a computer program, and when the computer program is executed by a processor, the phase identification method based on software topology function is implemented.

[0032] Compared with the prior art, the phase identification method based on software topology function described in the present invention has the following advantages:

[0033] (1) The phase identification method based on software topology function described in the present invention relies on the topology function but does not increase the topology-related hardware investment. It only simulates the topology process by software and adds relevant topology records without any additional economic expenditure. The present invention can realize the positioning of the equipment at the end of the power distribution, which is conducive to the realization of the automation and transparent management of the distribution network.

[0034] (2) The phase identification method based on software topology function described in the present invention adopts a comparison circuit design, which has a simple circuit and eliminates the relatively complex analog signal sampling circuit. It can also realize the phase identification function of multiple feeders at the same time, which is very suitable for situations such as meter boxes where one module manages multiple circuit breaker devices, and can greatly reduce economic expenditure. In addition, the circuit involved in the present invention can also realize the power outage analysis function. One circuit can realize two or more functions, reducing additional economic expenditure. BRIEF DESCRIPTION OF THE DRAWINGS

[0035] The accompanying drawings constituting a part of the present invention are used to provide a further understanding of the present invention. The exemplary embodiments of the present invention and their descriptions are used to explain the present invention and do not constitute an improper limitation of the present invention. In the accompanying drawings:

[0036] Figure 1 A schematic diagram of the software topology function flow according to an embodiment of the present invention;

[0037] Figure 2 A schematic diagram of a single phase identification process according to an embodiment of the present invention;

[0038] Figure 3 This is a schematic diagram of phase discrimination time analysis according to an embodiment of the present invention;

[0039] Figure 4 The figure is a schematic diagram of the power outage event analysis process described in an embodiment of the present invention. DETAILED DESCRIPTION

[0040] It should be noted that, in the absence of conflict, the embodiments of the present invention and the features in the embodiments may be combined with each other.

[0041] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside" and the like indicate positions or positional relationships based on the positions or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore cannot be understood as limiting the present invention. In addition, the terms "first", "second", and the like are only used for descriptive purposes, and cannot be understood as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", and the like may explicitly or implicitly include one or more of the features. In the description of the present invention, unless otherwise specified, "multiple" means two or more.

[0042] In the description of the present invention, it should be noted that, unless otherwise clearly specified and limited, the terms "installed", "connected", and "connected" should be understood in a broad sense, for example, it can be a fixed connection, a detachable connection, or an integral connection; it can be a mechanical connection or an electrical connection; it can be a direct connection, or it can be indirectly connected through an intermediate medium, or it can be the internal communication of two components. For ordinary technicians in this field, the specific meanings of the above terms in the present invention can be understood by specific circumstances.

[0043] The present invention will be described in detail below with reference to the accompanying drawings and in conjunction with embodiments.

[0044] like Figures 1 to 4 As shown, a phase identification method based on software topology function, when performing the topology function, the phase identification function is turned on, and the phase difference of the channel to be tested is determined by comparing with the reference A phase voltage; and the following steps are also included:

[0045] S1. After receiving the topology trigger function from the master station or operation and maintenance personnel, the management and measurement unit starts the phase identification function;

[0046] S2. After the phase identification function is turned on, wait for the arrival of the rising edge signal of the reference A phase voltage zero crossing point, turn on the millisecond timing sampling function, and clear the sampling time;

[0047] S3, after the millisecond timed sampling is turned on, the voltage level at the output of the voltage comparison circuit is collected regularly, and the sampling time is recorded in real time;

[0048] S4. When the sampling data at the output of the voltage comparison circuit is 1, and the phase of the channel to be tested has not been determined, the sampling time at this moment is compared with the determination limit. If the sampling time is within 6 milliseconds, it is determined that the phase of the channel to be tested is the A-phase voltage channel, and the current round of channel phase identification process is exited;

[0049] If the sampling time is within 13 milliseconds, it is determined that the channel to be tested is the B-phase voltage channel;

[0050] The remaining channels to be tested whose sampling data is 1 are determined to be C-phase voltage channels;

[0051] For the channels that have been identified, exit the current round of channel identification process and save the results;

[0052] S5, after a round of channel cycle determination is completed, if there are channels that have not been identified, repeat steps S2, S3, and S4 to perform the next round of missing check and gap filling;

[0053] S6. After step S5 is completed, in order to increase the recognition accuracy of each phase, steps S2, S3, S4 and S5 are repeated, which can be repeated 2 more times or set according to user needs;

[0054] S7. Finally, based on the statistical results, arbitration determines the phase difference of each channel and writes the phase difference into the topology record for operation and maintenance personnel to read and analyze.

[0055] In a preferred embodiment of the present invention, the software topology function is applied to the low-voltage user terminal. The topology function is simulated by software, which will not add new topology-related economic expenditures. It only records the topology generation signals and topology recording data through the software, and will not affect the normal topology function.

[0056] In a preferred embodiment of the present invention, the management and measurement unit is a functional collection unit integrating a phase identification method based on software topology function, which mainly includes a management and control module and a collection and monitoring module integrated with phase identification function.

[0057] In a preferred embodiment of the present invention, the management and control module has the main function of communicating with the main station, managing the connected air switches, and performing data analysis and storage; the module integrates a phase identification method based on the software topology function, which is responsible for the phase identification of the air switch and the real-time monitoring of the power outage operation status.

[0058] In a preferred embodiment of the present invention, the collection and monitoring module, whose core part is a voltage comparison circuit, a circuit that compares an external voltage with a set voltage. When the external voltage is greater than the set voltage, the circuit outlet is a high level greater than 3.0V, and the data collected by the management and control module is 1; when the external voltage is lower than the set voltage, the circuit outlet is a low level lower than 3.0V, and the data collected by the management and control module is 0; in addition, the voltage can be set according to the required value of the reliable voltage; the module is connected to the outlet voltage of the air switch to be tested at the bottom, and is connected to the management and control module at the top.

[0059] Phase discrimination needs to consider whether there is an abnormality in the line voltage. Only when the line voltage is normal, the phase discrimination result is more reliable. The steps for judging line power outage are as follows:

[0060] 1) The control module collects the voltage status of the air switch in a 1ms cycle. If the sampling amplitude is 1, it is considered that the air switch is energized, and if the sampling amplitude is 0, it is considered that the air switch is powered off;

[0061] 2) When the number of sampling points reaches 20, calculate the total amplitude and set it as the amplitude of the cycle;

[0062] 3) Compare the cycle amplitude with the set threshold. If the cycle amplitude is lower than the set threshold and lasts for 3s, it is determined that the air switch has a power outage.

[0063] The phase identification method described in the present invention relies on the topological function, but does not increase the topology-related hardware investment. It only simulates the topological process by software and adds relevant topological records without any additional economic expenditure. The present invention can realize the positioning of the equipment at the end of the distribution network, which is conducive to the realization of automated and transparent management of the distribution network.

[0064] The phase identification method described in the present invention adopts a comparison circuit design, has a simple circuit, eliminates a relatively complex analog signal sampling circuit, and can realize the simultaneous phase identification function of multiple feeders. It is very suitable for situations such as meter boxes where one module manages multiple circuit breaker devices, and can greatly reduce economic expenditures. In addition, the circuit involved in the present invention can also realize a power outage analysis function, and one circuit can realize two or more functions, reducing additional economic expenditures.

[0065] The method aims to identify the phase difference of the voltage connected to the air switch in the meter box of the low-voltage area and improve the transparent management of the low-voltage area.

[0066] First, the staff initiates a topology command through the main station or operation and maintenance tool. When the pipe test unit integrated with the phase identification method receives the topology command, it turns on the phase identification function. Then, it waits for the zero-crossing signal of the A-phase reference voltage. After the zero-crossing signal arrives, the voltage data of the air switch to be tested is read every millisecond, and the time is 20 milliseconds for one cycle. Finally, the time when the effective voltage of the air switch to be tested arrives is recorded, and then the phase difference of the air switch to be tested is analyzed based on the phase sequence relationship of the ABC three-phase voltage.

[0067] The topology function described in this method is a software topology, which performs software simulation based on the topology function process and the topology record data content. The software topology realizes the positioning of the air switch to be tested, but does not increase the additional cost related to the topology function hardware; in addition, the voltage sampling involved in this method is the data after the air switch outlet voltage passes through a simple voltage comparison circuit, which can greatly reduce the cost compared with the previous analog data acquisition circuit; this method can realize the simultaneous identification of multiple air switches, the identification is fast and accurate, and the number of air switches can be flexibly set, which is very suitable for the situation where one meter box manages multiple devices.

[0068] In addition, the present invention also proposes an electronic device, including a processor and a memory that is communicatively connected to the processor and is used to store executable instructions of the processor, and the processor is used to execute the above-mentioned phase identification method based on software topology function.

[0069] In addition, the present invention also proposes a server, comprising at least one processor, and a memory communicatively connected to the processor, wherein the memory stores instructions executable by the at least one processor, and the instructions are executed by the processor so that the at least one processor executes the phase identification method based on software topology function.

[0070] In addition, the present invention also proposes a computer-readable storage medium storing a computer program, wherein the computer program implements the phase identification method based on software topology function when executed by a processor.

[0071] Example 1

[0072] This embodiment takes 8 air switches in a meter box as the background, connects the outlet voltages of the 8 air switches to the inlet of the voltage comparison circuit, and then finally determines the phase difference of the voltage connected to each air switch through analysis of the control module that integrates a phase difference identification method based on software topology function of the present invention. The specific implementation plan is as follows:

[0073] like Figure 1 As shown, the master station or operation and maintenance personnel first obtain the records of the 8 air switches to be tested through the management and testing unit. Here, the 8 air switches can be marked with numbers 1 to 8 as the records; then, the topology generation command is issued to the air switches 1 to 8 in sequence through the records. When the management and control unit receives the number of the air switch it manages, the phase analysis function is turned on;

[0074] like Figure 2 As shown in the figure, after receiving the command to start the phase discrimination function, wait for the rising edge pulse of the reference A voltage to cross the zero point. When the rising pulse arrives, set the millisecond counter to zero, and then start reading data from the output side of the comparison circuit with a cycle of 1 millisecond; if there is a high level of 1 at the output data of the comparison circuit, record the value of the sampling time. Figure 3 The phase distinction time analysis diagram shown is used to determine which phase of ABC the phase belongs to; after the phase distinction of the air switch is completed, the data can be recorded and the current phase distinction identification process can be exited. The round mentioned here is one cycle of 50Hz alternating current, that is, one round of 20 milliseconds; when this round of judgment is completed, if it is detected that there is an air switch with an undetermined phase among the 8 air switches, the current phase distinction identification process will not be closed. After the next A phase voltage zero-crossing rising pulse arrives, the above process will be repeated to start the next round of judgment; it should be noted that the air switch that has been determined in the first round will directly exit the second round to save resources. The completion of two rounds of phase distinction judgment means the end of this phase distinction judgment process, and the phase distinction results of each air switch will be recorded;

[0075] When a single phase identification process is completed, you can choose whether to end the function according to your needs; in order to increase the accuracy of phase identification, this embodiment chooses to perform the process three times, compares and analyzes the three results obtained, determines the phase difference of the voltage connected to the final 8 air switches, and stores it in the topology record for the master station or operation and maintenance personnel to read and analyze.

[0076] In this embodiment, the monitoring module also performs power outage analysis in real time, such as Figure 4 As shown, the pipe measurement unit performs real-time 1 millisecond period sampling. After a cycle of 20 milliseconds, the amplitude calculation is performed to determine whether the amplitude of the cycle is lower than the threshold. The threshold in this embodiment is set to 3; the time lower than the door opening is recorded during the period. When the time meets the requirement, it is determined that the air switch is in a power-off state; this state can be used as an auxiliary evaluation of the above results: that is, if the air switch is in a power-off state, it can be considered that the air switch outlet voltage is abnormal, and this phase analysis can be determined to be invalid to prevent misjudgment.

[0077] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principle of the present invention should be included in the protection scope of the present invention.

Claims

1. A phase identification method based on software topology function, characterized in that: The following steps are involved: S1. When receiving the topology trigger function from the master station or operation and maintenance personnel, the management and measurement unit starts the phase identification function; S2. After the phase identification function is turned on, wait for the arrival of the rising edge signal of the reference A phase voltage zero crossing point, turn on the millisecond timing sampling function, and clear the sampling time; S3, after the millisecond timed sampling is turned on, the voltage level at the output of the voltage comparison circuit is collected regularly, and the sampling time is recorded in real time; S4. When the sampling data at the output of the voltage comparison circuit is 1, and the phase of the channel to be tested has not been determined, the sampling time at this moment is compared with the determination limit. If the sampling time is within 6 milliseconds, it is determined that the phase of the channel to be tested is the A-phase voltage channel, and the current round of channel phase identification process is exited; If the sampling time is within 13 milliseconds, it is determined that the channel to be tested is the B-phase voltage channel; The remaining channels to be tested whose sampling data is 1 are determined to be C-phase voltage channels; For the channels that have been identified, exit the current channel phase identification process and save the results; S5, after a round of channel cycle determination is completed, if there are channels that have not been identified, repeat steps S2, S3, and S4 to perform the next round of missing check and gap filling; S6. After step S5 is completed, in order to increase the recognition accuracy of each phase, steps S2, S3, S4 and S5 are repeated, which can be repeated 2 more times or set according to user needs; S7. Finally, according to the statistical results, the phase difference of each channel is determined by arbitration and written into the topology record for the operation and maintenance personnel to read and analyze; The pipe measuring unit includes a control module and a collection monitoring module with integrated phase identification function; The control module is used to communicate with the main station, manage the connected air switches, and perform data analysis and storage; it is responsible for the identification of air switches and real-time monitoring of power outage operation status; The acquisition monitoring module is used to connect the outlet voltage of the air switch to be tested downward and connect the control module upward; The acquisition monitoring module includes a voltage comparison circuit, which is a circuit that compares an external voltage with a set voltage; When the external voltage is greater than the set voltage, the circuit output is a high level greater than 3.0V, and the data collected by the control module is 1; When the external voltage is lower than the set voltage, the circuit output is a low level lower than 3.0V, and the data collected by the management and control module is 0.

2. The phase identification method based on software topology function according to claim 1 is characterized in that: The software topology function is applied to the low-voltage user terminal. It simulates the topology function through software. It will not add new topology-related economic expenditures. It only records the topology generation signals and topology recording data through the software, and will not affect the normal topology function.

3. The phase identification method based on software topology function according to claim 1 is characterized in that: Phase discrimination needs to consider whether there is an abnormality in the line voltage. Only when the line voltage is normal, the phase discrimination result is more reliable. The steps for judging line power outage are as follows: A1. The control module collects the voltage status of the air switch in a 1ms cycle. A sampling amplitude of 1 is considered to be energized on the air switch, and a sampling amplitude of 0 is considered to be de-energized on the air switch. A2. When the number of sampling points reaches 20, calculate the total amplitude and set it as the amplitude of the cycle; A3. Compare the cycle amplitude with the set threshold. If the cycle amplitude is lower than the set threshold and lasts for 3s, it is determined that the air switch has a power outage.

4. An electronic device, comprising a processor and a memory connected to the processor for storing instructions executable by the processor, characterized in that: The processor is used to execute the phase identification method based on software topology function as described in any one of claims 1 to 3.

5. A server, characterized in that: It includes at least one processor and a memory that is communicatively connected to the processor, wherein the memory stores instructions that can be executed by the at least one processor, and the instructions are executed by the processor so that the at least one processor executes the phase identification method based on software topology function as described in any one of claims 1-3.

6. A computer-readable storage medium storing a computer program, characterized in that: When the computer program is executed by a processor, the phase identification method based on software topology function described in any one of claims 1 to 3 is implemented.

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