A method and system for verifying the validity of phase-changing switch site selection

Abstract

The present invention discloses a method and system for verifying the effectiveness of phase-changing switch site selection, which is applied to the fields of smart grid analysis technology. The method includes: screening out substations where phase-changing switches need to be installed as candidate substations, and dividing the locations of the candidate substations into locations to be installed and locations not to be installed; obtaining the three-phase imbalance historical data of the candidate substations, and selecting multiple feature groups from the three-phase imbalance historical data; obtaining characteristic current data and reference current data; and judging the effectiveness of arranging the phase-changing switches at the locations to be installed. Through the above technical solution, the present invention can verify whether the strategy for phase-changing switch site selection is feasible based on the historical record data of the three-phase imbalance in the substation, the substation topology, and the characteristics of the load of key household meters, thereby obtaining a more preferred phase-changing switch site selection strategy to achieve effective management of three-phase imbalance; at the same time, the calculation process is simple, and can be used more effectively in engineering practice.

Description

Technical Field

[0001] The present invention relates to the technical field of smart grid analysis, and in particular to a method and system for verifying the effectiveness of site selection for a phase-changing switch. Background Art

[0002] For substations with three-phase imbalance, several phase-changing switches are deployed at the branches of the substation. When three-phase imbalance occurs on the substation side, a phase-changing command is sent to the corresponding phase-changing switch. After the phase-changing switch executes the phase-changing command, the phase of the back-end user will change, and the overall user load of the substation will form a new distribution pattern, thereby achieving three-phase load balance in the substation. As a common means of managing three-phase imbalance, installing a phase-changing switch can balance the three-phase load as much as possible and solve the three-phase imbalance problem from the source. Existing phase-changing switch technical solutions mostly study the hardware structure of the device or the switching control strategy after the device is deployed, and there is less research on the effectiveness of the installation position of the phase-changing switch. Summary of the invention

[0003] In order to at least overcome the above-mentioned deficiencies in the prior art, the purpose of the present application is to provide a method and system for verifying the effectiveness of phase-changing switch site selection.

[0004] In a first aspect, the present application provides a method for verifying the effectiveness of phase-changing switch site selection, comprising:

[0005] Screening out the substations where phase-changing switches need to be installed as candidate substations, and obtaining the substation topology map of the candidate substations;

[0006] Dividing the points of the candidate substation into planned installation points and non-planned installation points according to the substation topology map;

[0007] Acquire the three-phase unbalanced historical data of the candidate substation, and select a plurality of feature groups from the three-phase unbalanced historical data; the feature groups include three-phase unbalanced degrees and corresponding feature time periods;

[0008] Acquire the sum of current data of all back-end users of each of the proposed installation points within the characteristic time period as characteristic current data corresponding to the proposed installation point;

[0009] Obtaining the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users at the non-intended installation points during the characteristic period as reference current data;

[0010] The validity of arranging the phase-changing switches at the planned installation points is judged based on the characteristic current data corresponding to the plurality of characteristic time periods and the reference current data.

[0011] When implementing this application, it is necessary to first select the substations where the three-phase imbalance can be improved by installing phase-changing switches as candidate substations; for example, the substations that meet the following conditions can be selected as candidate substations: three-phase power supply substations; the number of three-phase imbalances in the past year is greater than or equal to 5; the cumulative duration of three-phase imbalance in the past year is greater than the preset threshold; three-phase imbalance has occurred recently. The selected candidate substations need to select the points where phase-changing switches can be installed as the intended installation points according to the topological distribution, and the points where phase-changing switches cannot be installed as non-intended installation points.

[0012] In the present application, when verifying the effectiveness of the phase-changing switch site selection, it is necessary to refer to the three-phase imbalance historical data of the candidate substation, from which multiple feature groups need to be screened out. The screening method can be based on the three-phase imbalance degree, and multiple time periods of three-phase imbalance are selected as feature time periods. The three-phase imbalance degree and feature time period corresponding to the feature time period can constitute a feature group. It should be understood that the feature time period can be a short period of time or a specific moment. Those skilled in the art can choose according to their needs, and the embodiments of the present application do not make many limitations. For example, the feature group can take the following form: (three-phase imbalance degree: 80.96%, feature time period: 2023-08-22 13:30:00 to 2023-08-22 13:45:00).

[0013] In the present application, the main idea is to determine whether installing a phase-changing switch at the intended installation point can effectively adjust the three-phase imbalance when the current at the non-intended installation point cannot be changed. Therefore, it is necessary to extract the characteristic current data first, and take the sum of the currents of all rear-end users at each intended installation point as a reference for phase switching, that is, the characteristic current data can be all phase-changed to the required incoming line phase through the phase-changing switch. In order to realize the above-mentioned design idea, the present application needs to obtain the three-phase current data of all rear-end users at non-intended installation points, and form reference current data. The reference current data is in the form of phase A current, phase B current and phase C current within the characteristic time period. Based on the acquired characteristic current data and reference current data, the effectiveness of the phase-changing switch after the intended installation point is arranged can be determined by means of three-phase imbalance verification, that is, whether the three-phase imbalance in the environmental substation can be effectively adjusted after the phase-changing switch is arranged. Through the above-mentioned technical scheme, the present application can verify whether the strategy of phase-changing switch selection is feasible based on the historical record data of three-phase imbalance in the substation, the substation topology, and the load characteristics of key household meters, so as to obtain a more preferred phase-changing switch site selection strategy to achieve effective control of three-phase imbalance; at the same time, the calculation process is simple and can be used more effectively in engineering practice.

[0014] Further, dividing the points of the candidate area into planned installation points and non-planned installation points according to the area topology map includes:

[0015] The points that meet the intended installation conditions are regarded as intended installation points, and the points that do not meet the intended installation conditions are regarded as non-intended installation points;

[0016] The proposed installation conditions include: the incoming line is 3 hot and 1 neutral, and the outgoing line is 1 hot and 1 neutral; the number of benchmark electricity users at the back end is greater than or equal to 1, and less than or equal to a preset value; the benchmark electricity users are users whose annual electricity consumption is greater than a preset value.

[0017] Further, obtaining the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users of the non-intended installation points within the characteristic period as reference current data includes:

[0018] Obtaining the sum of the currents of all the back-end users of the A phase at the non-intended installation points within the characteristic time period as the A phase reference current;

[0019] Obtaining the sum of the currents of all the back-end users of the B phase at the non-intended installation points within the characteristic time period as the B phase reference current;

[0020] Obtaining the sum of the currents of all the back-end users of the C phase at the non-intended installation points within the characteristic time period as the C phase reference current;

[0021] The A-phase reference current, the B-phase reference current and the C-phase reference current are used as the reference current data.

[0022] Further, judging the validity of arranging the phase-changing switch at the planned installation point according to the characteristic current data and the reference current data corresponding to the plurality of characteristic time periods includes:

[0023] The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when three-phase balance is achieved are calculated according to the reference current data; the maximum phase balance difference range is the current range that needs to be adjusted for the phase with the largest current in the reference current data when three-phase balance is achieved; the minimum phase balance difference range is the current range that needs to be adjusted for the phase with the smallest current in the reference current data when three-phase balance is achieved; the median phase balance difference range is the current range that needs to be adjusted for the phase with the middle current value in the reference current data when three-phase balance is achieved;

[0024] Divide all the proposed installation points into three groups, and calculate the sum of the characteristic current data of the proposed installation points in each group as the total current data of the group;

[0025] When there is a total current data corresponding to the grouping mode of the proposed installation points that meets the balance requirement, the characteristic time period is determined to be a valid time period; the balance requirement is that the minimum value of the three groups of corresponding total current data is within the range of the maximum phase balance difference range, the maximum value of the three groups of corresponding total current data is within the range of the minimum phase balance difference range, and the middle value of the three groups of corresponding total current data is within the range of the median phase balance difference range;

[0026] If the ratio of the number of effective time periods to the number of all characteristic time periods reaches a preset requirement, it is determined that it is effective to arrange the phase-changing switch at the proposed installation point.

[0027] Further, the maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when the three-phase balance is achieved are calculated according to the reference current data, including:

[0028] The upper limit of the maximum phase balance difference range is the target maximum phase current minus the current of the phase with the largest current in the reference current data;

[0029] The lower limit of the maximum phase balance difference range is the target minimum phase current minus the current of the phase with the largest current in the reference current data;

[0030] The upper limit of the minimum phase balance difference range is the target maximum phase current minus the current of the phase with the smallest current in the reference current data;

[0031] The lower limit of the minimum phase balance difference range is the target minimum phase current minus the current of the phase with the minimum current in the reference current data;

[0032] The upper limit of the median phase balance difference range is the current of the phase obtained by subtracting the target maximum phase current from the current median value in the reference current data;

[0033] The lower limit of the median phase balance difference range is the current of the phase obtained by subtracting the target minimum phase current from the median current value in the reference current data.

[0034] Furthermore, the target maximum phase current is calculated according to the following formula:

[0035] Target maximum phase current = (sum of three-phase currents of the total meter / 3)* (1+target threshold / 2);

[0036] The target minimum phase current is calculated according to the following formula:

[0037] Target minimum phase current = (sum of three-phase currents of the total meter / 3)*(1-target threshold / 2);

[0038] In the formula, the sum of the three-phase currents of the total meter is the sum of the A-phase current, B-phase current and C-phase current of the substation total meter; the target threshold is the qualified threshold of the three-phase imbalance.

[0039] Furthermore, multiple feature groups are selected from the three-phase unbalanced historical data, including:

[0040] Arranging the three-phase imbalance degrees in the three-phase imbalance historical data from high to low to form a three-phase imbalance sequence;

[0041] Acquire a maximum feature group, a minimum feature group, and an intermediate feature group in the three-phase unbalanced sequence as the feature group;

[0042] The maximum feature group is the maximum three-phase imbalance degree and the corresponding time period in the three-phase imbalance sequence; the minimum feature group is the minimum three-phase imbalance degree and the corresponding time period in the three-phase imbalance sequence; the intermediate feature group is at least one three-phase imbalance degree in the middle of the three-phase imbalance sequence and the corresponding time period.

[0043] In a second aspect, the present application also provides a phase-changing switch site selection validity verification system, comprising:

[0044] A screening unit is configured to screen out substations where phase-changing switches need to be installed as candidate substations, and obtain a substation topology map of the candidate substations;

[0045] A division unit, configured to divide the points of the candidate area into planned installation points and non-planned installation points according to the area topology map;

[0046] A selection unit is configured to obtain the three-phase unbalanced historical data of the candidate substation, and select a plurality of feature groups from the three-phase unbalanced historical data; the feature groups include three-phase unbalanced degrees and corresponding feature time periods;

[0047] A characteristic unit is configured to obtain the sum of current data of all back-end users of each of the proposed installation points within the characteristic period as characteristic current data corresponding to the proposed installation point;

[0048] A reference unit is configured to obtain the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users of the non-intended installation points within the characteristic time period as reference current data;

[0049] The analysis unit is configured to determine the effectiveness of arranging the phase-changing switch at the planned installation point based on the characteristic current data corresponding to the plurality of characteristic time periods and the reference current data.

[0050] Furthermore, the analysis unit is also configured to:

[0051] The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when three-phase balance is achieved are calculated according to the reference current data; the maximum phase balance difference range is the current range that needs to be adjusted for the phase with the largest current in the reference current data when three-phase balance is achieved; the minimum phase balance difference range is the current range that needs to be adjusted for the phase with the smallest current in the reference current data when three-phase balance is achieved; the median phase balance difference range is the current range that needs to be adjusted for the phase with the middle current value in the reference current data when three-phase balance is achieved;

[0052] Divide all the proposed installation points into three groups, and calculate the sum of the characteristic current data of the proposed installation points in each group as the total current data of the group;

[0053] When there is a total current data corresponding to the grouping mode of the proposed installation points that meets the balance requirement, the characteristic time period is determined to be a valid time period; the balance requirement is that the minimum value of the three groups of corresponding total current data is within the range of the maximum phase balance difference range, the maximum value of the three groups of corresponding total current data is within the range of the minimum phase balance difference range, and the middle value of the three groups of corresponding total current data is within the range of the median phase balance difference range;

[0054] If the ratio of the number of effective time periods to the number of all characteristic time periods reaches a preset requirement, it is determined that it is effective to arrange the phase-changing switch at the proposed installation point.

[0055] Furthermore, the analysis unit is also configured to:

[0056] The upper limit of the maximum phase balance difference range is the target maximum phase current minus the current of the phase with the largest current in the reference current data;

[0057] The lower limit of the maximum phase balance difference range is the target minimum phase current minus the current of the phase with the largest current in the reference current data;

[0058] The upper limit of the minimum phase balance difference range is the target maximum phase current minus the current of the phase with the smallest current in the reference current data;

[0059] The lower limit of the minimum phase balance difference range is the target minimum phase current minus the current of the phase with the minimum current in the reference current data;

[0060] The upper limit of the median phase balance difference range is the current of the phase obtained by subtracting the target maximum phase current from the current median value in the reference current data;

[0061] The lower limit of the median phase balance difference range is the current of the phase obtained by subtracting the target minimum phase current from the median current value in the reference current data.

[0062] Compared with the prior art, the present invention has the following advantages and beneficial effects:

[0063] Through the above technical scheme, the present invention can verify whether the strategy of phase-changing switch selection is feasible based on the historical record data of three-phase imbalance in the substation, the substation topology, and the load characteristics of key household meters, so as to obtain a more preferred phase-changing switch site selection strategy to achieve effective control of three-phase imbalance; at the same time, the calculation process is simple and can be used more effectively in engineering practice. BRIEF DESCRIPTION OF THE DRAWINGS

[0064] The drawings described herein are used to provide a further understanding of the embodiments of the present invention, constitute a part of this application, and do not constitute a limitation of the embodiments of the present invention. In the drawings:

[0065] Figure 1 This is a schematic diagram of the method steps of an embodiment of the present application. DETAILED DESCRIPTION

[0066] To make the purpose, technical scheme and advantages of the embodiment of the present application clearer, the technical scheme in the embodiment of the present application will be clearly and completely described below in conjunction with the drawings in the embodiment of the present application. It should be understood that the drawings in the present application only serve the purpose of explanation and description and are not used to limit the scope of protection of the present application. In addition, it should be understood that the schematic drawings are not drawn in real proportion. The flowchart used in this application shows the operations implemented according to some embodiments of the embodiment of the present application. It should be understood that the operations of the flowchart can be implemented out of sequence, and the steps without logical context can be reversed in order or implemented simultaneously. In addition, those skilled in the art can add one or more other operations to the flowchart under the guidance of the content of the present application, or remove one or more operations from the flowchart.

[0067] In addition, the described embodiments are only a part of the embodiments of the present application, rather than all the embodiments. The components of the embodiments of the present application described and shown in the drawings here can be arranged and designed in various configurations. Therefore, the following detailed description of the embodiments of the present application provided in the drawings is not intended to limit the scope of the application claimed for protection, but merely represents the selected embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those skilled in the art without making creative work belong to the scope of protection of the present application.

[0068] Please refer to Figure 1 , which is a flow chart of a method for verifying the validity of a phase-changing switch site selection provided in an embodiment of the present invention. Further, the method for verifying the validity of a phase-changing switch site selection may specifically include the contents described in the following steps S1 to S6.

[0069] S1: Screening out the substations where phase-changing switches need to be installed as candidate substations, and obtaining the substation topology map of the candidate substations;

[0070] S2: Dividing the points of the candidate area into planned installation points and non-planned installation points according to the area topology map;

[0071] S3: Acquire the three-phase unbalanced historical data of the candidate substation, and select a plurality of feature groups from the three-phase unbalanced historical data; the feature groups include the three-phase unbalanced degree and the corresponding feature time period;

[0072] S4: acquiring the sum of the current data of all back-end users at each of the proposed installation points within the characteristic time period as characteristic current data corresponding to the proposed installation point;

[0073] S5: Obtain the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users at the non-planned installation points within the characteristic period as reference current data;

[0074] S6: judging the validity of arranging the phase-changing switches at the planned installation points according to the characteristic current data corresponding to the plurality of characteristic time periods and the reference current data.

[0075] When implementing the embodiment of the present application, it is necessary to first select the substations where the three-phase imbalance can be improved by installing a phase-changing switch as candidate substations; for example, the substations that meet the following conditions can be selected as candidate substations: three-phase power supply substations; the number of three-phase imbalances occurring in the past year is greater than or equal to 5; the cumulative duration of three-phase imbalance in the past year is greater than a preset threshold; three-phase imbalance has occurred recently. The selected candidate substations need to select points where phase-changing switches can be installed as planned installation points according to the topological distribution, and points where phase-changing switches cannot be installed as non-planned installation points.

[0076] In the embodiment of the present application, when verifying the effectiveness of the phase-changing switch site selection, it is necessary to refer to the three-phase imbalance historical data of the candidate substation, from which multiple feature groups need to be screened out. The screening method can be based on the three-phase imbalance degree, and multiple time periods of three-phase imbalance are selected as feature time periods. The three-phase imbalance degree and feature time period corresponding to the feature time period can constitute a feature group. It should be understood that the feature time period can be a short period of time or a specific moment. Those skilled in the art can choose according to their needs, and the embodiment of the present application does not make many restrictions. For example, the feature group can take the following form: (three-phase imbalance degree: 80.96%, feature time period: 2023-08-22 13:45:00 to 2023-08-22 16:45:00).

[0077] In the embodiment of the present application, the main idea is to determine whether installing a phase-changing switch at the intended installation point can effectively adjust the three-phase imbalance when the current at the non-intended installation point cannot be changed. Therefore, it is necessary to extract the characteristic current data first, and take the sum of the currents of all rear-end users at each intended installation point as a reference for phase switching, that is, the characteristic current data can be all phase-changed to the required incoming line phase through the phase-changing switch. In order to realize the above-mentioned design idea, the embodiment of the present application needs to obtain the three-phase current data of all rear-end users at non-intended installation points, and form reference current data. The reference current data is in the form of phase A current, phase B current and phase C current within the characteristic time period. Based on the acquired characteristic current data and reference current data, the effectiveness of the phase-changing switch after arranging the intended installation point can be determined by means of three-phase imbalance verification, that is, whether the three-phase imbalance in the substation can be effectively alleviated after the phase-changing switch is arranged. For example, as a further technical solution, if the effectiveness of arranging the phase-changing switch at the intended installation point in the current solution does not meet the requirements, the intended installation point with the largest current is converted into a non-intended installation point, or the non-intended installation point with three inputs and one output and the smallest current is converted into an intended installation point to form a new solution for effectiveness verification.

[0078] Through the above-mentioned technical scheme, the present application can verify whether the strategy of phase-changing switch selection is feasible based on the historical record data of three-phase imbalance in the substation, the substation topology, and the load characteristics of key household meters, so as to obtain a more preferred phase-changing switch site selection strategy to achieve effective control of three-phase imbalance; at the same time, the calculation process is simple and can be used more effectively in engineering practice.

[0079] In a possible implementation, dividing the points of the candidate area into planned installation points and non-planned installation points according to the area topology map includes:

[0080] The points that meet the intended installation conditions are regarded as intended installation points, and the points that do not meet the intended installation conditions are regarded as non-intended installation points;

[0081] The proposed installation conditions include: the incoming line is 3 hot and 1 neutral, and the outgoing line is 1 hot and 1 neutral; the number of benchmark electricity users at the back end is greater than or equal to 1, and less than or equal to a preset value; the benchmark electricity users are users whose annual electricity consumption is greater than a preset value.

[0082] When the embodiment of the present application is implemented, a specific division scheme of the intended installation points and non-intended installation points is provided, wherein one condition that the intended installation points need to meet is that the incoming line is 3 live and 1 zero, and the outgoing line is 1 live and 1 zero. Under such conditions, the electricity consumption of the rear-end users of this point can be adjusted to the same phase, and the phase of the incoming line is switched by the phase-changing switch; another condition that the intended installation point needs to meet is that the number of benchmark electricity users at the rear end is greater than or equal to 1, and less than or equal to the preset value. The main reason is that only stable large-amount electricity users need to participate in the adjustment of three-phase imbalance. When the number of large-amount electricity users is too large, the electricity current generated by them may be greater than the gap current of the three-phase imbalance, which is difficult to adjust. Therefore, it is necessary to treat it as an unadjustable current and adapt and adjust it through other points. For example, the number of benchmark electricity users is greater than or equal to 1, and less than or equal to the preset value. The preset value in the preset value is 5.

[0083] In a possible implementation, obtaining the sum of the A-phase current, the sum of the B-phase current, and the sum of the C-phase current of all the back-end users of the non-intended installation points within the characteristic period as reference current data includes:

[0084] Obtaining the sum of the currents of all the back-end users of the A phase at the non-intended installation points within the characteristic time period as the A phase reference current;

[0085] Obtaining the sum of the currents of all the back-end users of the B phase at the non-intended installation points within the characteristic time period as the B phase reference current;

[0086] Obtaining the sum of the currents of all the back-end users of the C phase at the non-intended installation points within the characteristic time period as the C phase reference current;

[0087] The A-phase reference current, the B-phase reference current and the C-phase reference current are used as the reference current data.

[0088] When the embodiment of the present application is implemented, a specific method for obtaining reference current data is provided, in which the currents of all A-phases at non-intended installation points are added together to form an A-phase reference current; similarly, the B-phase reference current and the C-phase reference current are obtained to finally form the reference current data.

[0089] In a possible implementation, judging the validity of arranging the phase-changing switch at the planned installation point according to the characteristic current data and the reference current data corresponding to the plurality of characteristic time periods includes:

[0090] The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when three-phase balance is achieved are calculated according to the reference current data; the maximum phase balance difference range is the current range that needs to be adjusted for the phase with the largest current in the reference current data when three-phase balance is achieved; the minimum phase balance difference range is the current range that needs to be adjusted for the phase with the smallest current in the reference current data when three-phase balance is achieved; the median phase balance difference range is the current range that needs to be adjusted for the phase with the middle current value in the reference current data when three-phase balance is achieved;

[0091] Divide all the proposed installation points into three groups, and calculate the sum of the characteristic current data of the proposed installation points in each group as the total current data of the group;

[0092] When there is a total current data corresponding to the grouping mode of the proposed installation points that meets the balance requirement, the characteristic time period is determined to be a valid time period; the balance requirement is that the minimum value of the three groups of corresponding total current data is within the range of the maximum phase balance difference range, the maximum value of the three groups of corresponding total current data is within the range of the minimum phase balance difference range, and the middle value of the three groups of corresponding total current data is within the range of the median phase balance difference range;

[0093] If the ratio of the number of effective time periods to the number of all characteristic time periods reaches a preset requirement, it is determined that it is effective to arrange the phase-changing switch at the proposed installation point.

[0094] When the embodiment of the present application is implemented, its main purpose is to find out whether the three-phase imbalance control requirements of the entire substation can be met when the phase-changing switches are installed at the intended installation points, that is, when these phase-changing switches are working, whether there is a phase-changing scheme that can make the three-phase imbalance of the entire substation meet the requirements. Based on this concept, it is necessary to first calculate the current range that each phase needs to increase when the non-intended installation point meets the three-phase balance requirements in the characteristic time period, that is, the maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range.

[0095] In the embodiment of the present application, in order to find out whether there is a suitable solution, it is necessary to divide all the proposed installation points into three groups to form a solution. There will be multiple solutions in total, and the effectiveness of these solutions needs to be verified. During the verification process, since all the proposed installation points have been divided into three groups, each group can correspond to the current adjustment value of one phase. For the maximum phase balance difference range, the adjustment range should be the smallest, so the minimum value of the three groups of corresponding total current data needs to be consistent with the maximum phase balance difference range; similarly, it is necessary to simultaneously meet the maximum value of the three groups of corresponding total current data within the minimum phase balance difference range, and the middle value of the three groups of corresponding total current data within the median phase balance difference range. This means that in this characteristic period, the phase change of the phase-changing switch can make the three-phase imbalance meet the requirements.

[0096] In the embodiment of the present application, if the ratio of the number of valid time periods to the number of all characteristic time periods reaches a preset requirement, such as 80%, the larger the value, the higher the effectiveness, which means that the installation plan has long-term effectiveness.

[0097] In a possible implementation, calculating the maximum phase balance difference range, the minimum phase balance difference range, and the median phase balance difference range when three-phase balance is achieved according to the reference current data includes:

[0098] The upper limit of the maximum phase balance difference range is the target maximum phase current minus the current of the phase with the largest current in the reference current data;

[0099] The lower limit of the maximum phase balance difference range is the target minimum phase current minus the current of the phase with the largest current in the reference current data;

[0100] The upper limit of the minimum phase balance difference range is the target maximum phase current minus the current of the phase with the smallest current in the reference current data;

[0101] The lower limit of the minimum phase balance difference range is the target minimum phase current minus the current of the phase with the minimum current in the reference current data;

[0102] The upper limit of the median phase balance difference range is the current of the phase obtained by subtracting the target maximum phase current from the current median value in the reference current data;

[0103] The lower limit of the median phase balance difference range is the current of the phase obtained by subtracting the target minimum phase current from the median current value in the reference current data.

[0104] In one possible implementation, the target maximum phase current is calculated according to the following formula:

[0105] Target maximum phase current = (sum of three-phase currents of the total meter / 3)* (1+target threshold / 2);

[0106] The target minimum phase current is calculated according to the following formula:

[0107] Target minimum phase current = (sum of three-phase currents of the total meter / 3)*(1-target threshold / 2);

[0108] In the formula, the sum of the three-phase currents of the total meter is the sum of the A-phase current, B-phase current and C-phase current of the substation total meter; the target threshold is the qualified threshold of the three-phase imbalance.

[0109] When the embodiment of the present application is implemented, the target threshold represents the qualified threshold of the three-phase imbalance, which is generally set to 25%. The smaller the threshold, the more balanced it is.

[0110] In a possible implementation, selecting multiple feature groups from the three-phase unbalanced historical data includes:

[0111] Arranging the three-phase imbalance degrees in the three-phase imbalance historical data from high to low to form a three-phase imbalance sequence;

[0112] Acquire a maximum feature group, a minimum feature group, and an intermediate feature group in the three-phase unbalanced sequence as the feature group;

[0113] The maximum feature group is the maximum three-phase imbalance degree and the corresponding time period in the three-phase imbalance sequence; the minimum feature group is the minimum three-phase imbalance degree and the corresponding time period in the three-phase imbalance sequence; the intermediate feature group is at least one three-phase imbalance degree in the middle of the three-phase imbalance sequence and the corresponding time period.

[0114] When the embodiment of the present application is implemented, for the same candidate substation, its load characteristics under different three-phase imbalance conditions will be different. In order to comprehensively consider these differences, the embodiment of the present application selects three types of feature groups for effectiveness evaluation, which can effectively improve the accuracy of verification. For example, the number of selected feature groups is 5, the corresponding maximum feature group is 1, the minimum feature group is 1, and the intermediate feature group is 3. When the number of elements N in the three-phase imbalance sequence is an odd number, the three-phase imbalance arranged as the 1st, [(N+1) / 2]-1st, (N+1) / 2nd, [(N+1) / 2]+1st, and Nth positions and their corresponding time periods are selected as feature groups; when the number of elements N in the three-phase imbalance sequence is an even number, the three-phase imbalance arranged as the 1st, (N / 2)-1st, N / 2nd, (N / 2)+1st, and Nth positions and their corresponding time periods are selected as feature groups.

[0115] Based on the same inventive concept, the embodiment of the present application also provides a phase-changing switch site selection validity verification system, including:

[0116] A screening unit is configured to screen out substations where phase-changing switches need to be installed as candidate substations, and obtain a substation topology map of the candidate substations;

[0117] A division unit, configured to divide the points of the candidate area into planned installation points and non-planned installation points according to the area topology map;

[0118] A selection unit is configured to obtain the three-phase unbalanced historical data of the candidate substation, and select a plurality of feature groups from the three-phase unbalanced historical data; the feature groups include three-phase unbalanced degrees and corresponding feature time periods;

[0119] A characteristic unit is configured to obtain the sum of current data of all back-end users of each of the proposed installation points within the characteristic period as characteristic current data corresponding to the proposed installation point;

[0120] A reference unit is configured to obtain the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users of the non-intended installation points within the characteristic time period as reference current data;

[0121] The analysis unit is configured to determine the effectiveness of arranging the phase-changing switch at the planned installation point based on the characteristic current data corresponding to the plurality of characteristic time periods and the reference current data.

[0122] In a possible implementation, the analysis unit is further configured to:

[0123] The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when three-phase balance is achieved are calculated according to the reference current data; the maximum phase balance difference range is the current range that needs to be adjusted for the phase with the largest current in the reference current data when three-phase balance is achieved; the minimum phase balance difference range is the current range that needs to be adjusted for the phase with the smallest current in the reference current data when three-phase balance is achieved; the median phase balance difference range is the current range that needs to be adjusted for the phase with the middle current value in the reference current data when three-phase balance is achieved;

[0124] Divide all the proposed installation points into three groups, and calculate the sum of the characteristic current data of the proposed installation points in each group as the total current data of the group;

[0125] When there is a total current data corresponding to the grouping mode of the proposed installation points that meets the balance requirement, the characteristic time period is determined to be a valid time period; the balance requirement is that the minimum value of the three groups of corresponding total current data is within the range of the maximum phase balance difference range, the maximum value of the three groups of corresponding total current data is within the range of the minimum phase balance difference range, and the middle value of the three groups of corresponding total current data is within the range of the median phase balance difference range;

[0126] If the ratio of the number of effective time periods to the number of all characteristic time periods reaches a preset requirement, it is determined that it is effective to arrange the phase-changing switch at the proposed installation point.

[0127] In a possible implementation, the analysis unit is further configured to:

[0128] The upper limit of the maximum phase balance difference range is the target maximum phase current minus the current of the phase with the largest current in the reference current data;

[0129] The lower limit of the maximum phase balance difference range is the target minimum phase current minus the current of the phase with the largest current in the reference current data;

[0130] The upper limit of the minimum phase balance difference range is the target maximum phase current minus the current of the phase with the smallest current in the reference current data;

[0131] The lower limit of the minimum phase balance difference range is the target minimum phase current minus the current of the phase with the minimum current in the reference current data;

[0132] The upper limit of the median phase balance difference range is the current of the phase obtained by subtracting the target maximum phase current from the current median value in the reference current data;

[0133] The lower limit of the median phase balance difference range is the current of the phase obtained by subtracting the target minimum phase current from the median current value in the reference current data.

[0134] Those of ordinary skill in the art will appreciate that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0135] In the several embodiments provided in the present application, it should be understood that the disclosed devices and methods can be implemented in other ways. For example, the device embodiments described above are only schematic. For example, the division of the units is only a logical function division. There may be other division methods in actual implementation, such as multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. In addition, the mutual coupling or direct coupling or communication connection shown or discussed can be an indirect coupling or communication connection through some interfaces, devices or units, or it can be an electrical, mechanical or other form of connection.

[0136] The units described as separate components may or may not be physically separated. As units, it is obvious that a person of ordinary skill in the art can realize that the units and algorithm steps of each example described in conjunction with the embodiments disclosed herein can be implemented in electronic hardware, computer software, or a combination of the two. In order to clearly illustrate the interchangeability of hardware and software, the composition and steps of each example have been generally described in terms of function in the above description. Whether these functions are performed in hardware or software depends on the specific application and design constraints of the technical solution. Professional and technical personnel can use different methods to implement the described functions for each specific application, but such implementation should not be considered to be beyond the scope of the present invention.

[0137] In addition, each functional unit in each embodiment of the present invention may be integrated into one processing unit, or each unit may exist physically separately, or two or more units may be integrated into one unit. The above-mentioned integrated unit may be implemented in the form of hardware or in the form of software functional units.

[0138] If the integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present invention is essentially or the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, and the computer software product is stored in a storage medium, including a number of instructions for a computer device (which can be a personal computer, a server, or a grid device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk and other media that can store program codes.

[0139] The specific implementation methods described above further illustrate the objectives, technical solutions and beneficial effects of the present invention in detail. It should be understood that the above description is only a specific implementation method of the present invention and is not intended to limit the scope of protection of the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A method for verifying the effectiveness of phase-changing switch site selection, It is characterized in that include: Screening out the substations where phase-changing switches need to be installed as candidate substations, and obtaining the substation topology map of the candidate substations; Dividing the points of the candidate substation into planned installation points and non-planned installation points according to the substation topology map; Acquire the three-phase unbalanced historical data of the candidate substation, and select a plurality of feature groups from the three-phase unbalanced historical data; the feature groups include three-phase unbalanced degrees and corresponding feature time periods; Acquire the sum of current data of all back-end users of each of the proposed installation points within the characteristic time period as characteristic current data corresponding to the proposed installation point; Obtaining the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users at the non-intended installation points during the characteristic period as reference current data; Determining the validity of arranging the phase-changing switch at the planned installation point according to the characteristic current data corresponding to the plurality of characteristic time periods and the reference current data; Judging the validity of arranging the phase-changing switch at the planned installation point according to the characteristic current data and the reference current data corresponding to the plurality of characteristic time periods includes: The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when three-phase balance is achieved are calculated according to the reference current data; the maximum phase balance difference range is the current range that needs to be adjusted for the phase with the largest current in the reference current data when three-phase balance is achieved; the minimum phase balance difference range is the current range that needs to be adjusted for the phase with the smallest current in the reference current data when three-phase balance is achieved; the median phase balance difference range is the current range that needs to be adjusted for the phase with the middle current value in the reference current data when three-phase balance is achieved; Divide all the proposed installation points into three groups, and calculate the sum of the characteristic current data of the proposed installation points in each group as the total current data of the group; When there is a total current data corresponding to the grouping mode of the proposed installation points that meets the balance requirement, the characteristic time period is determined to be a valid time period; the balance requirement is that the minimum value of the three groups of corresponding total current data is within the range of the maximum phase balance difference range, the maximum value of the three groups of corresponding total current data is within the range of the minimum phase balance difference range, and the middle value of the three groups of corresponding total current data is within the range of the median phase balance difference range; If the ratio of the number of effective time periods to the number of all characteristic time periods reaches a preset requirement, it is determined that it is effective to arrange the phase-changing switch at the proposed installation point.

2. A method for verifying the effectiveness of phase-changing switch site selection according to claim 1, It is characterized in that Dividing the points of the candidate area into planned installation points and non-planned installation points according to the area topology map includes: The points that meet the intended installation conditions are regarded as intended installation points, and the points that do not meet the intended installation conditions are regarded as non-intended installation points; The proposed installation conditions include: the incoming line is 3 hot and 1 neutral, and the outgoing line is 1 hot and 1 neutral; the number of benchmark electricity users at the back end is greater than or equal to 1, and less than or equal to a preset value; the benchmark electricity users are users whose annual electricity consumption is greater than a preset value.

3. A method for verifying the effectiveness of phase-changing switch site selection according to claim 1, It is characterized in that Acquiring the sum of the A-phase current, the sum of the B-phase current, and the sum of the C-phase current of all the back-end users of the non-intended installation points during the characteristic period as reference current data includes: Obtaining the sum of the currents of all the back-end users of the A phase at the non-intended installation points within the characteristic time period as the A phase reference current; Obtaining the sum of the currents of all the back-end users of the B phase at the non-intended installation points within the characteristic time period as the B phase reference current; Obtaining the sum of the currents of all the back-end users of the C phase at the non-intended installation points within the characteristic time period as the C phase reference current; The A-phase reference current, the B-phase reference current and the C-phase reference current are used as the reference current data.

4. A method for verifying the effectiveness of phase-changing switch site selection according to claim 1, It is characterized in that The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when the three-phase balance is achieved according to the reference current data include: The upper limit of the maximum phase balance difference range is the target maximum phase current minus the current of the phase with the largest current in the reference current data; The lower limit of the maximum phase balance difference range is the target minimum phase current minus the current of the phase with the largest current in the reference current data; The upper limit of the minimum phase balance difference range is the target maximum phase current minus the current of the phase with the smallest current in the reference current data; The lower limit of the minimum phase balance difference range is the target minimum phase current minus the current of the phase with the minimum current in the reference current data; The upper limit of the median phase balance difference range is the current of the phase obtained by subtracting the target maximum phase current from the current median value in the reference current data; The lower limit of the median phase balance difference range is the current of the phase obtained by subtracting the target minimum phase current from the median current value in the reference current data.

5. A method for verifying the effectiveness of phase-changing switch site selection according to claim 4, It is characterized in that The target maximum phase current is calculated according to the following formula: Target maximum phase current = (sum of three-phase currents of the total meter / 3)* (1+target threshold / 2); The target minimum phase current is calculated according to the following formula: Target minimum phase current = (sum of three-phase currents of the total meter / 3)*(1-target threshold / 2); In the formula, the sum of the three-phase currents of the total meter is the sum of the A-phase current, B-phase current and C-phase current of the substation total meter; the target threshold is the qualified threshold of the three-phase imbalance.

6. A method for verifying the effectiveness of phase-changing switch site selection according to claim 1, It is characterized in that Select multiple feature groups from the three-phase unbalance history data including: Arranging the three-phase imbalance degrees in the three-phase imbalance historical data from high to low to form a three-phase imbalance sequence; Acquire a maximum feature group, a minimum feature group, and an intermediate feature group in the three-phase unbalanced sequence as the feature group; The maximum feature group is the maximum three-phase imbalance degree and the corresponding time period in the three-phase imbalance sequence; the minimum feature group is the minimum three-phase imbalance degree and the corresponding time period in the three-phase imbalance sequence; the intermediate feature group is at least one three-phase imbalance degree in the middle of the three-phase imbalance sequence and the corresponding time period.

7. A phase-changing switch site selection validity verification system, It is characterized in that include: A screening unit is configured to screen out substations where phase-changing switches need to be installed as candidate substations, and obtain a substation topology map of the candidate substations; A division unit, configured to divide the points of the candidate area into planned installation points and non-planned installation points according to the area topology map; A selection unit is configured to obtain the three-phase unbalanced historical data of the candidate substation and select a plurality of feature groups from the three-phase unbalanced historical data; The characteristic group includes three-phase unbalance and corresponding characteristic time periods; A characteristic unit is configured to obtain the sum of current data of all back-end users of each of the proposed installation points within the characteristic period as characteristic current data corresponding to the proposed installation point; A reference unit is configured to obtain three-phase current data of the sum of the A-phase current, the sum of the B-phase current and the sum of the C-phase current of all the back-end users of the non-intended installation points within the characteristic period as reference current data; An analysis unit, configured to determine the validity of arranging the phase-changing switch at the planned installation point according to the characteristic current data corresponding to the plurality of characteristic time periods and the reference current data; The analysis unit is further configured to: The maximum phase balance difference range, the minimum phase balance difference range and the median phase balance difference range when three-phase balance is achieved are calculated according to the reference current data; the maximum phase balance difference range is the current range that needs to be adjusted for the phase with the largest current in the reference current data when three-phase balance is achieved; the minimum phase balance difference range is the current range that needs to be adjusted for the phase with the smallest current in the reference current data when three-phase balance is achieved; the median phase balance difference range is the current range that needs to be adjusted for the phase with the middle current value in the reference current data when three-phase balance is achieved; Divide all the proposed installation points into three groups, and calculate the sum of the characteristic current data of the proposed installation points in each group as the total current data of the group; When there is a total current data corresponding to the grouping mode of the planned installation points that meets the balance requirement, the characteristic time period is determined to be a valid time period; The balance requirement is that the minimum value of the three corresponding total current data is within the range of the maximum phase balance difference range, the maximum value of the three corresponding total current data is within the range of the minimum phase balance difference range, and the middle value of the three corresponding total current data is within the range of the median phase balance difference range; If the ratio of the number of effective time periods to the number of all characteristic time periods reaches a preset requirement, it is determined that it is effective to arrange the phase-changing switch at the proposed installation point.

8. A phase-changing switch site selection validity verification system according to claim 7, It is characterized in that The analysis unit is further configured to: The upper limit of the maximum phase balance difference range is the target maximum phase current minus the current of the phase with the largest current in the reference current data; The lower limit of the maximum phase balance difference range is the target minimum phase current minus the current of the phase with the largest current in the reference current data; The upper limit of the minimum phase balance difference range is the target maximum phase current minus the current of the phase with the smallest current in the reference current data; The lower limit of the minimum phase balance difference range is the target minimum phase current minus the current of the phase with the minimum current in the reference current data; The upper limit of the median phase balance difference range is the current of the phase obtained by subtracting the target maximum phase current from the current median value in the reference current data; The lower limit of the median phase balance difference range is the current of the phase obtained by subtracting the target minimum phase current from the median current value in the reference current data.

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