Power supply safety monitoring method and system for distributed power grid

Abstract

The invention discloses a power supply safety monitoring method and system for a distributed power grid, and relates to the technical field of power grid monitoring, the system comprises a monitoring center, the monitoring center is in communication connection with a data acquisition module, a data processing module, a safety analysis module and a monitoring early warning module; the method comprises the following steps: by taking each power supply point in a distributed power grid as a reference, carrying out power data acquisition on a primary power supply node connected with the same power supply point, and meanwhile, carrying out power data acquisition and monitoring on each power node on each power supply line constructed by taking the primary power supply node as the reference point; therefore, comprehensive monitoring of each power line is realized, and meanwhile, when the power nodes are abnormal, the abnormal power early warning range is quickly determined through the abnormal nodes, so that a monitoring center is assisted in quickly knowing the power influence range, and the monitoring efficiency of the distributed power grid is improved.

Description

Technical Field

[0001] The present invention relates to the technical field of power grid monitoring, and in particular to a power supply safety monitoring method and system for a distributed power grid. Background Art

[0002] The intermittent, random, and volatile characteristics of distributed power output are one of the bottlenecks that restrict the absorption and efficient use of distributed power. The random grid connection and disordered charging of large-scale electric vehicles will generate peak loads and increase network losses. Strong fluctuating power sources and strong random loads make the distribution network present normal uncertainty and volatility, which poses a huge challenge to the safe and reliable operation of smart distribution networks, and also puts forward higher requirements for the coordinated optimization control of smart distribution networks;

[0003] How to achieve comprehensive and effective monitoring of each power node in a distributed power grid so that when an abnormality occurs in a power node, the impact range of the power anomaly can be quickly determined based on the distribution of the abnormal node, thereby improving the power grid monitoring efficiency, is a problem we need to solve. To this end, a power supply safety monitoring method and system for a distributed power grid are provided. Summary of the invention

[0004] The object of the present invention is to provide a method and system for monitoring power supply safety of a distributed power grid.

[0005] The object of the present invention can be achieved by the following technical solutions: A power supply safety monitoring system for a distributed power grid includes a monitoring center, wherein the monitoring center is communicatively connected to a data acquisition module, a data processing module, a safety analysis module, and a monitoring and early warning module;

[0006] The data acquisition module is used to collect power data from each power grid area;

[0007] The data processing module is used to process the power data of each power grid area;

[0008] The safety analysis module is used to analyze the power data of each power grid area according to the processing results of the power data, and determine whether there are abnormal nodes in the power grid area according to the analysis results;

[0009] The monitoring and early warning module is used to determine the corresponding power early warning range according to the existing abnormal nodes.

[0010] Furthermore, a plurality of power supply points are arranged in the power grid area, and each power supply point is connected to a plurality of power supply lines;

[0011] Each power supply line is connected to a corresponding power node, all power nodes connected to the power supply node are recorded as primary power supply nodes, and the power supply line connecting the primary power supply node and the power supply node is the power supply line, which is used for the power supply node to transmit power to the primary power supply node;

[0012] Each primary power supply node is also connected to a plurality of first transmission lines, the other end of the first transmission line is connected to a first transmission node, the first transmission node is recorded as a secondary power supply node, the first transmission line between the secondary power supply node and the primary power supply node is recorded as a first-level first transmission line, and the first-level first transmission line is used for the primary power supply node to transmit power to the secondary power supply node;

[0013] Each secondary power supply node is also connected to several second transmission lines, the other end of the second transmission line is connected to a second transmission node, the second transmission node is recorded as a tertiary power supply node, and the second transmission line between the tertiary power supply node and the secondary power supply node is recorded as a secondary transmission line. The secondary transmission line is used to transmit electricity from the secondary power supply node to the tertiary power supply node, and so on, until the final power consumption end.

[0014] Furthermore, the process of the data acquisition module collecting power data from each power grid area includes:

[0015] A corresponding data acquisition terminal is set at each power supply point to obtain the remaining available power value and real-time output power of the corresponding power supply point;

[0016] A corresponding data acquisition terminal is set at each power supply node, and power data of the corresponding power supply node is acquired through the data acquisition terminal, wherein the power data includes input voltage, input current, output current and output voltage;

[0017] The obtained power data of the power supply nodes in the same power grid area are aggregated to obtain the power data of the corresponding power grid area.

[0018] Furthermore, the data processing module processes the power data of each power grid area including:

[0019] Construct a time coordinate system with respect to current and voltage;

[0020] Generating an input voltage variation curve, an input current variation curve, an output voltage variation curve, and an output current variation curve for the input voltage, input current, output voltage, and output current of each primary power supply node connected to the same power supply point, respectively, and mapping them to the constructed coordinate system;

[0021] A time window is set in the coordinate system, the start time of the time window is t1, the end time is t2, and the end time corresponds to the current time;

[0022] Obtaining the operation evaluation coefficient of the primary power supply node and the power supply evaluation coefficient;

[0023] Taking the primary power supply node as the reference point, the corresponding power supply route is obtained, and the operation evaluation coefficient Jp of each power supply node on the power supply route is obtained. j and the self-assessment coefficient ZP j .

[0024] Furthermore, the process of the security analysis module analyzing the power data of each power grid area according to the processing result of the power data includes:

[0025] Set the corresponding operation evaluation threshold and power supply evaluation threshold for each primary power supply node, denoted as Yp and Gp respectively;

[0026] According to the operation evaluation threshold value and the power supply evaluation threshold value of the first-level power supply node, the operation evaluation threshold value Yp of each power supply node on the power supply route with the first-level power supply node as the reference point is obtained. j and power supply assessment threshold Gp j ;

[0027] The obtained operation evaluation coefficient Py of the primary power supply node i And the power supply evaluation coefficient Dg i Compare with the operation assessment threshold Yp and power supply assessment threshold Gp of the first-level power supply node respectively, and judge whether there is a safety risk in the first-level power supply node according to the comparison results;

[0028] When Py i >Yp, it indicates that the primary power supply node is abnormal, and the primary power supply node is marked as an abnormal node; otherwise, it indicates that the primary power supply node is normal;

[0029] When Dg i >Gp, it means that the power source point or power supply line connected to the primary power supply node is abnormal, and the primary power supply node is marked as a regulating node.

[0030] Furthermore, when the primary power supply node is normal, the operation evaluation coefficient Jp of each power supply node on the power supply route with the primary power supply node as the reference point is j And the power supply evaluation factor ZP j The operation evaluation threshold Yp of the corresponding power supply node j and power supply assessment threshold Gp j Perform a comparison and determine whether there is a security risk in the primary power supply node based on the comparison results;

[0031] When Jp j >Yp j, it means that the transmission line connected to the corresponding power supply node is abnormal, and the power supply node is marked as a normal node;

[0032] When ZP j >Gp j , it means that there is an abnormality in the power supply node, and the power supply node is marked as an abnormal node; otherwise, it means that the power supply node is normal.

[0033] Furthermore, the process of the monitoring and early warning module determining the corresponding power early warning range according to the existing abnormal nodes includes:

[0034] Obtaining whether there is a primary power supply node marked as a regulating node among the primary power supply nodes; if so, obtaining other primary power supply nodes connected to the primary power supply node and marking them as candidate nodes;

[0035] Obtain whether there is a normal node among the candidate nodes. If not, generate a second-level warning message. If there is a normal node, record the corresponding candidate node as a scheduling node, temporarily power the regulating node through the power point connected to the scheduling node, and generate a first-level warning message at the same time;

[0036] If a primary power supply node is marked as an abnormal node, all power supply routes with the primary power supply node as the reference point will be marked as abnormal power warning ranges, and secondary warning information will be generated at the same time;

[0037] The power supply nodes marked as abnormal nodes on the power supply route are summarized, and the summarized power supply nodes and the transmission lines connected to the power supply nodes are marked as abnormal power warning ranges, and secondary warning information is generated.

[0038] Furthermore, a power supply safety monitoring method for a power supply safety monitoring system of a distributed power grid comprises the following steps:

[0039] Step S1: Collecting power data from each power node in each power grid area;

[0040] Step S2: Processing the collected power data of each power node to obtain an evaluation coefficient of each power node;

[0041] Step S3: Analyze the power data of each power grid area, and determine whether there are abnormal nodes in the power grid area based on the analysis results.

[0042] Compared with the prior art, the present invention has the following beneficial effects:

[0043] Based on the various power supply points in the distributed power grid, power data is collected from the first-level power supply nodes connected to the same power supply point. At the same time, power data is collected and monitored for each power node on each power supply line constructed with the first-level power supply node as the reference point, thereby achieving comprehensive monitoring of each power route. At the same time, when an abnormality occurs in a power node, the abnormal power warning range is quickly determined through the abnormal node, thereby assisting the monitoring center to quickly understand the power impact range, thereby improving the monitoring efficiency of the distributed power grid. BRIEF DESCRIPTION OF THE DRAWINGS

[0044] In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings required for use in the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments recorded in the present invention. For ordinary technicians in this field, other drawings can also be obtained based on these drawings.

[0045] Figure 1 A schematic diagram of a power supply safety monitoring system for a distributed power grid according to the present invention;

[0046] Figure 2 The present invention is a flow chart of a method for monitoring power supply safety of a distributed power grid. DETAILED DESCRIPTION

[0047] like Figure 1 As shown, a power supply safety monitoring system for a distributed power grid includes a monitoring center, wherein the monitoring center is communicatively connected to a data acquisition module, a data processing module, a safety analysis module, and a monitoring and early warning module;

[0048] The data acquisition module is used to collect power data from each power grid area;

[0049] Several power supply points are arranged in the power grid area, and each power supply point is connected to several power supply lines;

[0050] Each power supply line is connected to a corresponding power node, all power nodes connected to the power supply node are recorded as primary power supply nodes, and the power supply line connecting the primary power supply node and the power supply node is the power supply line, which is used for the power supply node to transmit power to the primary power supply node; wherein, a primary power supply node can be connected to multiple power supply lines;

[0051] A temporary power transmission line is provided between the primary power supply node and at least another primary power supply node;

[0052] Each primary power supply node is also connected to a plurality of first transmission lines, the other end of the first transmission line is connected to a first transmission node, the first transmission node is recorded as a secondary power supply node, the first transmission line between the secondary power supply node and the primary power supply node is recorded as a first-level first transmission line, and the first-level first transmission line is used for the primary power supply node to transmit power to the secondary power supply node;

[0053] Each secondary power supply node is also connected to several second transmission lines, the other end of the second transmission line is connected to a second transmission node, the second transmission node is recorded as a tertiary power supply node, and the second transmission line between the tertiary power supply node and the secondary power supply node is recorded as a secondary transmission line. The secondary transmission line is used to transmit electricity from the secondary power supply node to the tertiary power supply node, and so on, until the final power consumption end.

[0054] A corresponding data acquisition terminal is set at each power supply point to obtain the remaining available power value and real-time output power of the corresponding power supply point;

[0055] A corresponding data acquisition terminal is set at each power supply node, and power data of the corresponding power supply node is acquired through the data acquisition terminal, wherein the power data includes input voltage, input current, output current and output voltage;

[0056] The obtained power data of the power supply nodes in the same power grid area are aggregated to obtain the power data of the corresponding power grid area and uploaded to the data processing module.

[0057] The data processing module is used to process the power data of each power grid area, and the specific process includes:

[0058] Each primary power supply node connected to the same power supply point is labeled as i, where i=1, 2, ..., n;

[0059] The input voltage of the first-level power supply node is recorded as Ur i , input current is recorded as Ir i , the output current is recorded as Ic i , the output voltage is recorded as Uc i ;

[0060] Construct a time coordinate system with respect to current and voltage;

[0061] According to the obtained input voltage, input current, output voltage and output current of the primary power supply node, an input voltage change curve, an input current change curve, an output voltage change curve and an output current change curve are generated respectively, and mapped into the constructed coordinate system;

[0062] A time window is set in the coordinate system, the start time of the time window is t1, the end time is t2, and the end time corresponds to the current time;

[0063] Obtain the operation evaluation coefficient of the primary power supply node and the power supply evaluation coefficient, and record the operation evaluation coefficient as Py i , the power supply evaluation coefficient is recorded as Dg i ;

[0064] in,

[0065] Among them, β i represents the equipment loss coefficient of the primary power supply node labeled i, k i represents the voltage regulation coefficient of the primary power supply node labeled i;

[0066] in,

[0067] Where W is the real-time output power of the power supply, X i is the line loss coefficient of the power supply line;

[0068] Taking the primary power supply node as the reference point, the corresponding power supply route is obtained, and each power supply node on the power supply route is numbered as j=1, 2, ..., m, where the power supply node numbered m is the power consumption end;

[0069] Get the operation evaluation coefficient of the power supply node labeled j, denoted as Jp j ;

[0070] in,

[0071] Where j>1, X j is the line loss coefficient of the transmission line corresponding to the power supply node labeled j;

[0072] Then the self-assessment coefficient of the power supply node labeled j is further obtained, denoted as ZP j ;

[0073]

[0074] Among them, β j represents the equipment loss coefficient of the power supply node labeled j, k j Indicates the voltage regulation coefficient of the power supply node labeled j.

[0075] The security analysis module is used to analyze the power data of each power grid area and determine whether there are abnormal nodes in the power grid area according to the analysis results. The specific process includes:

[0076] A corresponding operation evaluation threshold and power supply evaluation threshold are set for each primary power supply node, which are denoted as Yp and Gp respectively; it should be further explained that in the specific implementation and process, the operation evaluation threshold of the primary power supply node is determined by the primary power supply node itself, and the power supply evaluation threshold is positively correlated with the length of the power supply line;

[0077] According to the operation evaluation threshold and the power supply evaluation threshold of the primary power supply node, the operation evaluation threshold and the power supply evaluation threshold of each power supply node on the power supply route with the primary power supply node as the reference point are obtained;

[0078] The operation evaluation threshold and power supply evaluation threshold of the power supply node labeled j are recorded as Yp j and Gp j ;

[0079]

[0080] And so on;

[0081] Among them, β is the equipment loss coefficient of the primary power supply node;

[0082]

[0083] Where X is the line loss coefficient of the power supply line corresponding to the primary power supply node;

[0084] The obtained operation evaluation coefficient Py of the primary power supply node i And the power supply evaluation coefficient Dg i Compare with the operation assessment threshold Yp and power supply assessment threshold Gp of the first-level power supply node respectively, and judge whether there is a safety risk in the first-level power supply node according to the comparison results;

[0085] When Py i >Yp, it indicates that the primary power supply node is abnormal, and the primary power supply node is marked as an abnormal node; otherwise, it indicates that the primary power supply node is normal;

[0086] When Dg i >Gp, it means that the power source point or power supply line connected to the primary power supply node is abnormal, and the primary power supply node is marked as a regulating node;

[0087] It should be further explained that, in the specific implementation process, when a primary power supply node is marked as an abnormal node and a regulating node at the same time, the primary power supply node is finally marked as an abnormal node;

[0088] When the primary power supply node is normal, the operation evaluation coefficient Jp of each power supply node on the power supply route with the primary power supply node as the reference point is j and the self-assessment coefficient ZP jThe operation evaluation threshold Yp of the corresponding power supply node j and power supply assessment threshold Gp j Perform a comparison and determine whether there is a security risk in the primary power supply node based on the comparison results;

[0089] When Jp j >Yp j , it means that the transmission line connected to the corresponding power supply node is abnormal, and the power supply node is marked as a normal node;

[0090] When ZP j >Gp j , it means that there is an abnormality in the power supply node, and the power supply node is marked as an abnormal node; otherwise, it means that the power supply node is normal.

[0091] The monitoring and early warning module is used to determine the corresponding power early warning range according to the existing abnormal nodes. The specific process includes:

[0092] Obtaining whether there is a primary power supply node marked as a regulating node among the primary power supply nodes; if so, obtaining other primary power supply nodes connected to the primary power supply node and marking them as candidate nodes;

[0093] Obtain whether there is a normal node among the candidate nodes. If not, generate a second-level warning message. If there is a normal node, record the corresponding candidate node as a scheduling node, temporarily power the regulating node through the power point connected to the scheduling node, and generate a first-level warning message at the same time;

[0094] If a primary power supply node is marked as an abnormal node, all power supply routes with the primary power supply node as the reference point will be marked as abnormal power warning ranges, and secondary warning information will be generated at the same time;

[0095] The power supply nodes marked as abnormal nodes on the power supply route are summarized, and the summarized power supply nodes and the transmission lines connected to the power supply nodes are marked as abnormal power warning ranges, and secondary warning information is generated.

[0096] like Figure 2 As shown, in another embodiment of the present invention, a method for monitoring power supply security of a distributed power grid is also disclosed, comprising the following steps:

[0097] Step S1: Collecting power data from each power node in each power grid area;

[0098] Step S2: Processing the collected power data of each power node to obtain an evaluation coefficient of each power node;

[0099] Step S3: Analyze the power data of each power grid area, and determine whether there are abnormal nodes in the power grid area based on the analysis results.

[0100] The above description is only a preferred embodiment of the present invention and does not limit the present invention in any form. Although the present invention has been disclosed as a preferred embodiment as above, it is not used to limit the present invention. Any technical personnel in this field can make some changes or modify the technical contents disclosed above into equivalent embodiments with equivalent changes without departing from the scope of the technical solution of the present invention. However, any modification or equivalent replacement of the above embodiments made according to the technical essence of the present invention without departing from the content of the technical solution of the present invention still falls within the scope of the technical solution of the present invention.

Claims

1. A power supply safety monitoring system for a distributed power grid, comprising a monitoring center, characterized in that: The monitoring center is communicatively connected to a data acquisition module, a data processing module, a safety analysis module and a monitoring and early warning module; The data acquisition module is used to collect power data from each power grid area; The data processing module is used to process the power data of each power grid area; The safety analysis module is used to analyze the power data of each power grid area according to the processing results of the power data, and determine whether there are abnormal nodes in the power grid area according to the analysis results; The monitoring and early warning module is used to determine the corresponding power early warning range according to the existing abnormal nodes.

2. A power supply safety monitoring system for a distributed power grid according to claim 1, characterized in that: Several power supply points are arranged in the power grid area, and each power supply point is connected to several power supply lines; Each power supply line is connected to a corresponding power node, all power nodes connected to the power supply node are recorded as primary power supply nodes, and the power supply line connecting the primary power supply node and the power supply node is the power supply line, which is used for the power supply node to transmit power to the primary power supply node; Each primary power supply node is also connected to a plurality of first transmission lines, the other end of the first transmission line is connected to a first transmission node, the first transmission node is recorded as a secondary power supply node, the first transmission line between the secondary power supply node and the primary power supply node is recorded as a first-level first transmission line, and the first-level first transmission line is used for the primary power supply node to transmit power to the secondary power supply node; Each secondary power supply node is also connected to several second transmission lines, the other end of the second transmission line is connected to a second transmission node, the second transmission node is recorded as a tertiary power supply node, and the second transmission line between the tertiary power supply node and the secondary power supply node is recorded as a secondary transmission line. The secondary transmission line is used to transmit electricity from the secondary power supply node to the tertiary power supply node, and so on, until the final power consumption end.

3. A power supply safety monitoring system for a distributed power grid according to claim 2, characterized in that: The process of the data acquisition module collecting power data from each power grid area includes: A corresponding data acquisition terminal is set at each power supply point to obtain the remaining available power value and real-time output power of the corresponding power supply point; A corresponding data acquisition terminal is set at each power supply node, and power data of the corresponding power supply node is acquired through the data acquisition terminal, wherein the power data includes input voltage, input current, output current and output voltage; The obtained power data of the power supply nodes in the same power grid area are aggregated to obtain the power data of the corresponding power grid area.

4. A power supply safety monitoring system for a distributed power grid according to claim 3, characterized in that: The data processing module processes the power data of each power grid area including: Construct a time coordinate system with respect to current and voltage; Generating an input voltage variation curve, an input current variation curve, an output voltage variation curve, and an output current variation curve for the input voltage, input current, output voltage, and output current of each primary power supply node connected to the same power supply point, respectively, and mapping them to the constructed coordinate system; A time window is set in the coordinate system, the start time of the time window is t1, the end time is t2, and the end time corresponds to the current time; Obtaining the operation evaluation coefficient of the primary power supply node and the power supply evaluation coefficient; Taking the primary power supply node as the reference point, the corresponding power supply route is obtained, and the operation evaluation coefficient Jp of each power supply node on the power supply route is obtained. j and the self-assessment coefficient ZP j .

5. A power supply safety monitoring system for a distributed power grid according to claim 4, characterized in that: The process of the security analysis module analyzing the power data of each power grid area according to the processing result of the power data includes: Set the corresponding operation evaluation threshold and power supply evaluation threshold for each primary power supply node, denoted as Yp and Gp respectively; According to the operation evaluation threshold value and the power supply evaluation threshold value of the first-level power supply node, the operation evaluation threshold value Yp of each power supply node on the power supply route with the first-level power supply node as the reference point is obtained. j and power supply assessment threshold Gp j ; The obtained operation evaluation coefficient Py of the primary power supply node i And the power supply evaluation coefficient Dg i Compare with the operation assessment threshold Yp and power supply assessment threshold Gp of the first-level power supply node respectively, and judge whether there is a safety risk in the first-level power supply node according to the comparison results; When Py i >Yp, it indicates that the primary power supply node is abnormal, and the primary power supply node is marked as an abnormal node; otherwise, it indicates that the primary power supply node is normal; When Dg i >Gp, it means that the power source point or power supply line connected to the primary power supply node is abnormal, and the primary power supply node is marked as a regulating node.

6. A power supply safety monitoring system for a distributed power grid according to claim 5, characterized in that: When the primary power supply node is normal, the operation evaluation coefficient Jp of each power supply node on the power supply route with the primary power supply node as the reference point is j And the power supply evaluation factor ZP j The operation evaluation threshold Yp of the corresponding power supply node j and power supply assessment threshold Gp j Perform a comparison and determine whether there is a security risk in the primary power supply node based on the comparison results; When Jp j >Yp j , it means that the transmission line connected to the corresponding power supply node is abnormal, and the power supply node is marked as a normal node; When ZP j >Gp j , it means that there is an abnormality in the power supply node, and the power supply node is marked as an abnormal node; otherwise, it means that the power supply node is normal.

7. A power supply safety monitoring system for a distributed power grid according to claim 6, characterized in that: The process of the monitoring and early warning module determining the corresponding power early warning range according to the existing abnormal nodes includes: Obtaining whether there is a primary power supply node marked as a regulating node among the primary power supply nodes; if so, obtaining other primary power supply nodes connected to the primary power supply node and marking them as candidate nodes; Obtain whether there is a normal node among the candidate nodes. If not, generate a second-level warning message. If there is a normal node, record the corresponding candidate node as a scheduling node, temporarily power the regulating node through the power point connected to the scheduling node, and generate a first-level warning message at the same time; If a primary power supply node is marked as an abnormal node, all power supply routes with the primary power supply node as the reference point will be marked as abnormal power warning ranges, and secondary warning information will be generated at the same time; The power supply nodes marked as abnormal nodes on the power supply route are summarized, and the summarized power supply nodes and the transmission lines connected to the power supply nodes are marked as abnormal power warning ranges, and secondary warning information is generated.

8. A power supply safety monitoring method for a power supply safety monitoring system for a distributed power grid according to any one of claims 1 to 7, characterized in that: The following steps are involved: Step S1: Collecting power data from each power node in each power grid area; Step S2: Processing the collected power data of each power node to obtain an evaluation coefficient of each power node; Step S3: Analyze the power data of each power grid area, and determine whether there are abnormal nodes in the power grid area based on the analysis results.

Images