Electric energy metering method and system taking power supply station as minimum unit

Abstract

An electric energy metering method taking a power supply station as a minimum unit is characterized by comprising the following steps: in a line patrol process, sequentially selecting subsection metering points from a wire outlet end of a transformer in a 10kV transformer area to a load side direction, and additionally installing metering equipment on the subsection metering points; establishing a segmented line model according to the position information of the segmented metering points and the association information between the segmented metering points, and importing preset model parameters into the segmented line model; collecting electric energy metering information of segmented metering points corresponding to metering equipment, and calculating power supply information of a line segment between any two adjacent segmented metering points according to the electric energy metering information and the segmented line model; detecting power utilization information and loss information of the line section based on the power supply information of the line section and the preset model parameters; and managing and controlling the 10kV line based on the power supply information, the power utilization information and the loss information of the line section.

Description

Technical Field

[0001] The present invention relates to the field of power systems, and more specifically, to a power metering method, system and metering device with a power supply station as the smallest unit. Background Art

[0002] With the continuous advancement of the power grid's line loss management work, the difference between the synchronous line loss rate and the theoretical line loss rate of the distribution line is continuously compressed, and the line loss governance has entered a bottleneck period and a wandering period. It is difficult to further reduce the line loss rate of the distribution line. Some lines that have completely eliminated high losses and abnormal losses soon repeat, and the compliance rate of equipment line losses cannot be effectively improved.

[0003] Currently, the line loss management of the distribution network mainly focuses on the overall power grid level, using traditional power metering equipment and line loss calculation methods. In the distribution network, the load characteristics and line structures within the jurisdiction of each power supply station are different, and the traditional unified line loss calculation method is difficult to meet the management needs of different regions.

[0004] In addition, traditional line loss management technologies often rely on limited metering point data. Due to the complex branches and variable load characteristics of the distribution line, it is difficult to accurately locate specific loss points in the line loss calculation at the overall power grid level, which limits the accuracy of line loss calculation and analysis, makes it difficult to achieve refined line loss monitoring and analysis, and results in low line loss governance efficiency.

[0005] Existing distribution network line loss management usually can only achieve line loss monitoring and control of the whole or a large area. Due to the differences in cross-professional line loss management strategies on the distribution network side, problems such as the transfer of substation area line losses to the line and the existence of blind spots in the calculation and monitoring of line losses in segmented distribution lines have long been unable to be effectively solved. Since there are only power metering points at the outgoing line end and the end transformer, the existing line loss metering method cannot accurately monitor the line losses of each segment and branch of the distribution network, resulting in low line loss monitoring accuracy.

[0006] The frequency of the meter reading data of the acquisition equipment is limited, and it is impossible to achieve real-time monitoring and analysis of line losses, resulting in poor real-time performance of line loss analysis. The equipment has a single function and cannot achieve data fusion acquisition, and cannot achieve automatic identification of the line-transformer relationship, detection of line losses in segmented distribution lines, and linkage analysis of medium and low voltage line losses. The line loss data lags behind, making it difficult to timely discover and solve line loss abnormal problems, resulting in lagging line loss governance.

[0007] In view of the above problems, there is an urgent need for a power metering method, system and metering device with a power supply station as the smallest unit. Summary of the Invention

[0008] To solve the deficiencies in the prior art, the present invention provides a power metering method and system with a power supply station as the smallest unit. By presetting sectional metering points and installing metering devices to collect the power supply information of sectional lines, the power consumption information of the sectional lines is integrated to measure the line loss, so as to implement, effectively monitor and control the line loss of the line segments.

[0009] The present invention adopts the following technical solutions.

[0010] In the first aspect of the present invention, it relates to a power metering method with a power supply station as the smallest unit. The method includes the following steps: during the line inspection process, starting from the outgoing line end of the 10kV substation transformer, sequentially select sectional metering points in the direction of the load side, and install metering devices at the sectional metering points; establish a sectional line model according to the position information of the sectional metering points and the association information between the sectional metering points, and import preset model parameters into the sectional line model; collect the power metering information of the sectional metering points corresponding to the metering devices, and calculate the power supply information of the line segment between any two adjacent sectional metering points according to the power metering information and the sectional line model; detect the power consumption information and loss information of the line segment based on the power supply information and the preset model parameters of the line segment; implement control over the 10kV line based on the power supply information, power consumption information and loss information of the line segment.

[0011] Preferably, during the line inspection process, starting from the outgoing line end of the 10kV substation transformer, sequentially selecting sectional metering points in the direction of the load side includes: extracting all important load access points on the transmission line where the load exceeds the preset amount and all line branch points, and setting the first sectional metering point upstream of the important load access points and the line branch points; calculating the distance between any two adjacent first sectional metering points, aiming at the minimum distance among them, filling in one or more second sectional metering points between the sparsely adjacent first sectional metering points to ensure that the distance between any two sectional metering points is close to the minimum distance within the range of the preset difference amount; if there are different types of loads between any two sectional metering points, filling in the third sectional metering point between the different types of loads.

[0012] Preferably, during the line inspection process, starting from the outgoing line end of the 10kV substation transformer, sequentially selecting sectional metering points in the direction of the load side includes: allocating position information and association information to each sectional metering point; the position information includes one or more items of information such as the 10kV line where the sectional metering point is located, the line-transformer relationship of the 10kV line, the geographical location of the sectional metering point, and the upstream and downstream load user numbers of the sectional metering point; the association information includes the upstream metering point and the downstream metering point of the sectional metering point.

[0013] Preferably, a metering device is installed at the segmented metering point, including: in the three-phase AC circuit at the segmented metering point position, split-core current sensors are respectively installed on any two phases, and phase voltage sensors are respectively installed between any two phases and the remaining one phase; the split-core current sensors and the voltage sensors are respectively connected to a wireless communication unit; the corresponding relationship between the wireless communication unit and the segmented metering point is configured, and the wireless communication unit is connected to a metering platform.

[0014] Preferably, a segmented line model is established according to the position information of the segmented metering point and the association information between the segmented metering points, and preset model parameters are imported into the segmented line model, including: collecting the position information and association information sent by the segmented metering point through the metering platform, and establishing a segmented line model based on the position information and association information; when there are differences between the topological structure of the segmented line model and the pre-established substation area file information in the marketing system and the collection system, prompt the substation area file update information to the marketing system and the collection system; import the electricity purchase amount of the load users from the marketing system into the metering platform, and import the electricity consumption amount of the load users from the collection system into the metering platform; use the position information of the segmented metering point to correspond the electricity purchase amount and electricity consumption amount of the load users to the line segment between any two adjacent segmented metering points, so as to inject preset model information into the segmented line model.

[0015] Preferably, collect the power metering information of the segmented metering point corresponding to the metering device, and calculate the power supply information of the line segment between any two adjacent segmented metering points according to the power metering information and the segmented line model, including: the phase current and phase voltage of the segmented metering point collected by the split-core current sensor and the phase voltage sensor; calculate the active power, reactive power, apparent power and power supply amount in a preset period at the segmented metering point by using the phase current and phase voltage; calculate the difference in power supply amount between the upstream segmented metering point and the adjacent downstream segmented metering point, so as to obtain the power supply information of the corresponding line segment.

[0016] Preferably, detect the electricity consumption information and loss information of the line segment based on the power energy information of the line segment and the preset model parameters, including: the electricity consumption information of the line segment is obtained by extracting the electricity purchase amount of the load users in the line segment from the preset model parameters; the loss information of the line segment is obtained by calculating the line loss rate of the line segment by using the power supply information and the electricity purchase information.

[0017] Preferably, the control of the 10 kV line is implemented based on the power supply information, power consumption information, and loss information of the line segment, including: when the difference between the power supply information and the power consumption information of any line segment exceeds the first preset threshold, the difference amount is extracted, and when the number of times of the difference amount exceeds the preset number of times, a line segment capacity change suggestion is reported; when the loss information of any line segment exceeds the second preset threshold, the loss information is immediately extracted and a line loss anomaly warning for the line segment is issued.

[0018] In the second aspect of the present invention, there is provided an electric energy metering system with a power supply station as the smallest unit. The system is implemented by using an electric energy metering method with a power supply station as the smallest unit in the first aspect of the present invention. The system includes metering devices and a metering platform. The metering devices are installed at preselected sectional metering points. The metering platform establishes a sectional line model based on the position information of the sectional metering points and the association information between the sectional metering points. Moreover, the metering platform collects the electric energy metering information of the sectional metering points corresponding to the metering devices. There are data interfaces between the metering platform and the marketing system and the acquisition system, and preset model parameters are imported into the sectional line model through the data interfaces. The metering platform calculates the power supply information of the line segment between any two adjacent sectional metering points based on the electric energy metering information and the sectional line model, detects the power consumption information and loss information of the line segment based on the power supply information of the line segment and the preset model parameters, and implements control of the 10 kV line based on the power supply information, power consumption information, and loss information of the line segment.

[0019] In the third aspect of the present invention, there is provided a metering device, including a processor and a storage medium. The device includes a first split-core current sensor, a second split-core current sensor, a first phase voltage sensor, a second phase voltage sensor, and a wireless communication unit. The storage medium is used to store the electric energy metering information collected by the sensors and the metering instructions sent by the wireless communication unit. The wireless communication unit is used to upload the electric energy metering information or receive metering instructions. The processor is used to operate according to the instructions to execute the steps of the method in the first aspect of the present invention.

[0020] The beneficial effects of the present invention are as follows. Compared with the prior art, in an electric energy metering method and system with a power supply station as the smallest unit in the present invention, by presetting sectional metering points and installing metering devices to collect the power supply information of the sectional lines, and fusing the power consumption information of the sectional lines to measure the line loss, the line loss implementation, effective monitoring, and control of the line segments are thus implemented. The present invention relies on the management level of the power supply station, further refines the granularity of the line loss management of each line, splits the distribution line into sections, calculates and manages the line loss of each section, and explores a new model for the line loss management of the power supply station in terms of power consumption by region and voltage level, providing effective support for continuously improving the company's power consumption and line loss management levels.

[0021] The beneficial effects of the present invention also include: 1. The present invention adopts a zoned and voltage-differentiated line loss management mode. By independently calculating and analyzing the power and line losses of different zones and voltage levels in the power supply station, the line loss problem can be identified more accurately and the line loss management level can be improved. The accurate identification of the line-to-transformer relationship in the substation solves the problem of high and negative line losses caused by inaccurate line-to-transformer relationships.

[0022] 2. The present invention realizes the function of calculating the line loss of distribution lines by sections through the lean management of line loss in the substation area and the calculation of line loss by grades, thereby reducing the operating cost and the intensity of work at the grassroots level. The method realizes the accurate calculation of the daily and monthly line loss of each section of the distribution line within the power supply area, quickly locates the problem, and improves the lean management level of the line loss of the distribution line.

[0023] 3. Segmented line loss calculation improves calculation accuracy, facilitates abnormal location, and optimizes resource allocation. By dividing the medium-voltage line into multiple independent metering sections, segmented line loss calculation can accurately collect electricity for each metering section, improving the granularity of line loss calculation. Segmented calculation makes the line loss situation of each metering section clearly visible. Once the line loss of a certain section of the line is found to be abnormal, it can be quickly located to the specific area, which greatly facilitates subsequent troubleshooting and management. Based on the accurate segmented line loss calculation results, strategies such as power grid planning, equipment replacement and upgrading can be formulated more scientifically to ensure that resources are most reasonably allocated and reduce unnecessary waste.

[0024] 4. Line-to-transformer relationship identification improves management efficiency and reduces the risk of high and negative line losses. The method can significantly reduce errors in line-to-transformer relationship files caused by human factors or delayed system updates, ensure the accuracy of the power grid topology, and lay a solid foundation for subsequent line loss calculations, power flow analysis, and other work. When the line-to-transformer relationship files are erroneous or inaccurate, it is easy to cause high or negative line losses. Through line-to-transformer relationship identification technology, these erroneous relationships can be discovered and corrected in a timely manner to ensure that line loss calculations are correct and reduce the risk of high and negative line losses.

[0025] 5. The combination of segmented line loss calculation and line-to-transformer relationship identification can achieve all-round and multi-level optimization of the medium-voltage distribution network. By accurately calculating the line loss of each metering section and ensuring a reasonable line-to-transformer relationship, it provides rich and accurate data support for power grid managers. BRIEF DESCRIPTION OF THE DRAWINGS

[0026] Figure 1 It is a flow chart of an electric energy metering method taking a power supply station as the smallest unit according to the present invention; Figure 2 It is a schematic diagram of the installation method of the metering equipment in the electric energy metering method taking the power supply station as the smallest unit of the present invention; Figure 3Schematic diagram of metering information upload in a power metering method with a power supply station as the smallest unit according to the present invention; Figure 4 Schematic diagram of the sectional metering method in a power metering method with a power supply station as the smallest unit according to the present invention. Specific implementation manner

[0027] To make the objectives, technical solutions and advantages of the present invention clearer and more accurate, the technical solutions of the present invention will be described in detail below through multiple specific implementation manners. The embodiments adopted by the present invention are only used to explain the present invention and are not used to limit the content of the present invention.

[0028] The objective of the present invention is to provide a line loss management method based on sectionalization of distribution lines, which can identify line-transformer pairs in the distribution network and conduct refined line loss detection and analysis, realize dynamic management of line loss and implementation of loss reduction objectives, provide technical support for the sectional and voltage-level management of power supply stations, and realize sectional and voltage-level line loss detection and analysis with power supply stations as the smallest units.

[0029] Figure 1 Flow schematic diagram of a power metering method with a power supply station as the smallest unit according to the present invention. As Figure 1 shown, in the first aspect of the present invention, it relates to a power metering method with a power supply station as the smallest unit, and the method includes Step 1 to Step 5.

[0030] Step 1, during the line inspection process, sequentially select sectional metering points from the outgoing line end of the 10 kV substation transformer towards the load side, and install metering devices at the sectional metering points.

[0031] The key to realizing sectional metering lies in reasonably selecting sectional points. It is necessary to comprehensively consider the load distribution, topological structure and actual requirements of the line, and reasonably select the sectional point positions and the number of line sections, so as to reduce the implementation difficulty and equipment cost while ensuring sectional metering. Through preliminary investigation, determine the demarcation points of the 10 kV lines between power supply stations, install sectional metering and acquisition devices on the 10 kV lines, and complete the installation of acquisition equipment.

[0032] Preferably, during the line inspection process, sectional metering points are sequentially selected from the outgoing terminal of the 10kV substation transformer towards the load side, including: extracting all important load access points on the transmission line where the load exceeds a preset amount, all line branch points, and setting the first sectional metering points upstream of the important load access points and the line branch points; calculating the distances between any two adjacent first sectional metering points, and taking the minimum distance as the target, adding one or more second sectional metering points between the sparsely adjacent first sectional metering points to ensure that the distance between any two sectional metering points is close to the minimum distance within the range of a preset difference; if there are different types of loads between any two sectional metering points, adding third sectional metering points between the different types of loads.

[0033] Select key nodes of the line as sectional points, such as important load access points, line branch points, etc. Try to make the sectional points evenly distributed on the entire line to more accurately monitor and analyze the line loss of each section. Consider the distribution of users to ensure that the user types and load characteristics within each section are relatively consistent.

[0034] Among them, the first, second, and third sectional metering points are set and deployed in sequence or whether to set them is selected according to the situation. Flexibly adjust the number of sectional metering points according to the number of power supply stations, line length, line importance, etc. in the line. Deploy the sectional metering points sequentially from the outgoing side of the substation downwards, and install metering equipment at the metering points. The evenly distributed metering points can ensure that the line losses on multiple adjacent line segments are uniform, facilitating the analysis of abnormal line losses in a certain line segment.

[0035] Preferably, during the line inspection process, sectional metering points are sequentially selected from the outgoing terminal of the 10kV substation transformer towards the load side, including: allocating position information and associated information to each of the sectional metering points; the position information includes one or more of the 10kV line where the sectional metering point is located, the line-transformer relationship of the 10kV line, the geographical location of the sectional metering point, and the upstream and downstream load user numbers of the sectional metering point; the associated information includes the upstream metering point and the downstream metering point of the sectional metering point.

[0036] Through the position information of the sectional metering points, the gateway information of the load users corresponding to the sectional metering points can be obtained, such as the gateway equipment number in the existing acquisition system. In addition, the power supply station and the responsible line between two adjacent sectional metering points, as well as the responsible unit for the maintenance and management of the power supply station, can also be obtained.

[0037] In the present invention, metering devices are installed according to the line inspection process of operation and maintenance personnel, and the position information of corresponding sectional metering points is collected. In one embodiment, first, the substation area files are obtained through the existing marketing system and collection system, and then the sectional metering points are deployed based on the substation area files. The substation area files record information such as the connection mode of the outgoing line of the substation area, the load users on the line, and the power supply station.

[0038] However, errors in the substation area files are important influencing factors leading to abnormal line losses. Specifically, the file information in the substation area such as the marketing system and the collection system does not match the actual situation on site. For example, the file information in the marketing system lags behind the on-site meter change, or the files in the collection system are not synchronized in time, resulting in the omission of electricity sales statistics, and further causing high losses or negative losses in the substation area. In addition, when the low-voltage line is reconnected, the distribution transformer is added, and the user substation area is adjusted, if the data is not synchronously changed in systems such as the production management system and the geographic information system, it will also cause the "line-transformer-user" topological relationship in the system to fail to be synchronously updated, resulting in meter reading failure or electricity quantity statistics error.

[0039] Therefore, the present invention supports taking the substation area files as the main basis, pre-dividing the line segments, and initially deploying the sectional metering points. During the actual line inspection process, it is checked whether the substation area files are accurate according to the actual line connection situation, and the deployment positions of the sectional metering points are improved according to the adjusted "line-transformer-user" topological relationship.

[0040] The associated information of the present invention can number the metering points successively deployed on the same line, obtain the upstream metering point and the downstream metering point according to the number size, so as to calculate the electricity quantity difference in subsequent steps and comprehensively analyze the distribution network line loss based on this.

[0041] In one embodiment, it also supports establishing a line-transformer relationship database based on the reported line-transformer relationship information. Regularly check and update the database to ensure the accuracy and real-time nature of the line-transformer relationship, providing a basis for the subsequent configuration of the sectional line model.

[0042] Preferably, metering devices are installed on the sectional metering points, including: in the three-phase alternating current circuit at the position of the sectional metering point, split-core current sensors are respectively installed on any two phases, and inter-phase voltage sensors are respectively installed between any two phases and the remaining one phase; the split-core current sensors and the voltage sensors are respectively connected to a wireless communication unit; the corresponding relationship between the wireless communication unit and the sectional metering point is configured, and the wireless communication unit is connected to the metering platform.

[0043] Figure 2 It is a schematic diagram of the installation method of metering devices in a power metering method with the power supply station as the smallest unit of the present invention. As Figure 2As shown, the metering device at the segmented metering point is small and portable compared to the existing metering devices, thus reducing the difficulty of on-site installation. The metering device can be set as a toolized device, and through quick installation and disassembly, it can meet the actual needs. In specific cases, the method also supports positioning the abnormal line loss points segment by segment by changing the installation position. A flexible connection is adopted between the split-core current sensor and the meter body, and no modification to the existing line is required during on-site installation. The installation position is flexible and convenient, meeting the requirements for quickly installing the electric energy metering device.

[0044] Figure 3 This is a schematic diagram of the metering information upload in a power supply station as the smallest unit in the electric energy metering method of the present invention. As Figure 3 shown, the segmented metering device consists of a metering unit and a communication unit. The metering unit includes voltage and current sensors, and the communication unit also includes an interaction module, which can realize local data display and upload the collected data to the metering platform through a 4G private network.

[0045] Step 2: Establish a segmented line model according to the position information of the segmented metering points and the association information between the segmented metering points, and import preset model parameters into the segmented line model.

[0046] Preferably, establishing a segmented line model according to the position information of the segmented metering points and the association information between the segmented metering points, and importing preset model parameters into the segmented line model includes: collecting the position information and association information sent by the segmented metering points through the metering platform, and establishing a segmented line model based on the position information and association information; when there are differences between the topological structure of the segmented line model and the pre-established substation file information in the marketing system and the collection system, prompting the marketing system and the collection system for substation file update information; importing the electricity purchase amount of the load users from the marketing system into the metering platform, and importing the electricity consumption amount of the load users from the collection system into the metering platform; using the position information of the segmented metering points to correspond the electricity purchase amount and electricity consumption amount of the load users to the line segment between any two adjacent segmented metering points, so as to inject preset model information into the segmented line model.

[0047] The segmented line model constructs a topological line model according to the position and association method of the segmented metering points. As described above, if differences are detected between the model and the substation file, file update is prompted. The electric energy metering method of the present invention is based on the topological connection method recorded in the metering platform.

[0048] In one embodiment, the metering platform is deployed in an existing substation management system, which includes the configuration of the distribution line model. The configuration information may also include the corresponding content of the marketing system and the acquisition system. After the data of the sectional metering device is accessed, in order to meet the need of sinking the distribution line management to the power supply station and avoid the abnormal situation of the distribution line loss caused by the error of the substation file, a new sectional line model configuration function can be added to the distribution line model configuration, and the distribution line model can be configured sectionally with the sectional metering point as the demarcation point.

[0049] Since the position of the sectional metering device in the line has been determined according to the marks and records during installation, through the sectional line model, the corresponding information after importing the marketing system and the acquisition system, that is, the preset model parameters, can be obtained. In one embodiment, the gateway metering information in the marketing system can be obtained from the marketing system according to the installation position of the metering device. The gateway metering information is the information used by a specific measurement point in the marketing system to monitor the input and output of electric energy, which may include the information of the gateway electric energy meters of various load users, and this provides a basis for selling electricity in the marketing system. The gateway information may include the electric energy quantity, current load, etc. of the preset period collected by each gateway electric energy meter device, and these information can be used together with the power supply quantity information collected in the previous steps of the present invention to calculate the line loss.

[0050] Different gateway electric energy meters can be corresponding to the position of the sectional metering device, and one or more gateway electric energy meters correspond to one metering device or one line section.

[0051] Step 3, collect the electric energy metering information of the sectional metering point corresponding to the metering device, and calculate the power supply information of the line section between any two adjacent sectional metering points according to the electric energy metering information and the sectional line model.

[0052] Preferably, collecting the electric energy metering information of the sectional metering point corresponding to the metering device and calculating the power supply information of the line section between any two adjacent sectional metering points according to the electric energy metering information and the sectional line model includes: collecting the phase current and phase voltage of the sectional metering point through the split-core current sensor and the phase voltage sensor; calculating the active power, reactive power, apparent power and the power supply quantity of the preset period at the sectional metering point by using the phase current and phase voltage; calculating the difference between the power supply quantities of the upstream sectional metering point and the adjacent downstream sectional metering point, so as to obtain the power supply information of the corresponding line section.

[0053] The metering device can collect two-phase currents and the corresponding two-phase voltages. By establishing a joint solution equation, information such as the active power, reactive power, and apparent power at the metering point can be obtained, thereby analyzing the actual load at the metering point. The power at the metering point within a preset time period is accumulated, and the power supply quantity for the preset time period is calculated. This power supply quantity is all the electric energy delivered from the low-voltage side of the transformer substation to this metering point. By calculating the difference in the power supply quantities between two adjacent metering points, the difference in the power supply quantity of the line segment between the two adjacent metering points can be obtained. This part of the power supply quantity is used to supply power to the loads on the line segment and overcome the line losses at the same time.

[0054] Therefore, for each segmented metering point, the power supply quantity can be obtained by calculating the difference in the electric energy flow from the previous metering point to the current metering point. The formula is: Power supply quantity = Electricity quantity of the previous metering point - Electricity quantity of the current metering point. The electricity sales quantity needs to be statistically calculated based on the information of all high-voltage users and the gateway of the transformer substation within the segment and the electricity sales quantity recorded in the marketing system. It can be summarized by regularly obtaining data from the acquisition system to ensure the accuracy of the electricity sales quantity.

[0055] Step 4, based on the power supply information of the line segment and the preset model parameters, detect the electricity consumption information and loss information of the line segment.

[0056] Preferably, detecting the electricity consumption information and loss information of the line segment based on the electric energy information of the line segment and the preset model parameters includes: The electricity consumption information of the line segment is obtained by extracting the electricity purchase quantity of the load users in the line segment from the preset model parameters; the loss information of the line segment is obtained by calculating the line loss rate of the line segment using the power supply information and the electricity purchase information.

[0057] According to the segmented situation of the distribution line, the line is divided into multiple independent management units, and the power supply quantity and electricity consumption quantity of each segment are calculated through the data collected by the segmented metering acquisition device. For each segment, the power supply quantity is the electricity quantity of the previous metering point minus the electricity quantity of the current metering point. The electricity consumption quantity is the sum of the electricity sales quantities of all high-voltage users and the transformer substation within this segment.

[0058] Theoretically, the line loss rate = Line loss power / Total power supply of the power grid. In actual calculation, the synchronous line loss rate = (Synchronous electricity quantity - Synchronous electricity sales quantity) / Synchronous electricity quantity can be used for calculation. According to the power supply quantity and electricity sales quantity data of each segment, the line loss rate of the daily and monthly distribution lines is calculated.

[0059] The situations that cause abnormal line losses include voltage drop losses, current losses, transformer losses, losses caused by load changes, etc. By calculating the line loss rate situations on multiple consecutive segments, the reasons for abnormal line losses can be accurately monitored, the line losses can be located, and the power transmission efficiency can be optimized.

[0060] Step 5: Implement control over the 10kV line based on the power supply information, power consumption information, and loss information of the line segment.

[0061] Preferably, implementing control over the 10kV line based on the power supply information, power consumption information, and loss information of the line segment includes: the control includes: when the difference between the power supply information and the power consumption information of any line segment exceeds the first preset threshold, extract the difference amount, and when the number of times of the difference amount exceeds the preset number of times, report a line segment capacity change suggestion; when the loss information of any line segment exceeds the second preset threshold, immediately extract the loss information and issue a line loss anomaly warning for the line segment.

[0062] For the case where a distribution line supplies power to only one power supply station, the responsible unit of the line can be adjusted to the power supply station on the component gateway model configuration page. The responsible unit usually refers to the power supply station responsible for the management and maintenance of this line. By adjusting the responsible unit, it can be clear which power supply stations are responsible for the management of specific lines, thereby improving the pertinence and efficiency of management. The adjusted responsible unit can better reflect the actual load situation of the line, which helps to conduct more refined line loss analysis and management.

[0063] For the case where a distribution line supplies power across multiple power supply stations, perform sectional model configuration. Figure 4 This is a schematic diagram of the sectional metering method in the power energy metering method with the power supply station as the smallest unit of the present invention. As Figure 4 shown, metering point A is the metering point on the outgoing side of the substation of this 10kV line, and metering points B and C are the metering points of the previously installed sectional metering acquisition devices. The sold electricity quantities D, E, and F respectively correspond to the high-voltage user and substation area sold electricity quantities of this line within the jurisdiction of power supply stations X, Y, and Z. In the sectional line model of this 10kV line within the jurisdiction of power supply station X, the power supply quantity model should be the electricity quantity of metering point A on the outgoing side of the substation of the 10kV line minus the electricity quantity of sectional metering point B, and the sold electricity quantity is the total sum of the high-voltage user and substation area sold electricity quantities of this 10kV line within the jurisdiction of power supply station X, that is, sold electricity quantity D. In the sectional line model of this 10kV line within the jurisdiction of power supply station Y, the power supply quantity model should be the electricity quantity of sectional metering point B minus the electricity quantity of sectional metering point C, and the sold electricity quantity is the total sum of the high-voltage user and substation area sold electricity quantities of this 10kV line within the jurisdiction of power supply station Y, that is, sold electricity quantity E. In the sectional line model of this 10kV line within the jurisdiction of power supply station Z, the power supply quantity model should be the electricity quantity of sectional metering point C, and the sold electricity quantity is the total sum of the high-voltage user and substation area sold electricity quantities of this 10kV line within the jurisdiction of power supply station Z, that is, sold electricity quantity F. According to the power supply quantity and sold electricity quantity data of each sectional line, calculate the line loss rate of the daily and monthly distribution lines. Display the calculation results in the form of charts, reports, etc., support the line loss analysis at the power supply station level, and provide decision-making support.

[0064] Based on the existing distribution network model configuration, the metering platform innovatively adds the function of sectional model configuration. This function allows for the flexible configuration of the power supply and power sales models for each distribution line according to the actual jurisdiction area of the power supply station and sectional metering points, thus achieving refined management, solving the problem of insufficient accuracy caused by overall calculation in the traditional model, making the line loss calculation more accurate, and providing a more scientific decision-making basis for the power supply station.

[0065] For the complex situation where a distribution line spans multiple power supply stations for power supply, the present invention proposes a sectional model configuration method. The line is divided into multiple independent management units through sectional metering points, and each unit corresponds to a power supply station for management and calculation, effectively solving the problem of cross-regional line management, solving the problem of difficult line loss detection caused by complex lines and chaotic substation archives, avoiding abnormal line losses caused by reasons such as substation inversion, and improving the efficiency and accuracy of line loss management.

[0066] The method of the present invention can be widely applied to medium and low voltage distribution networks, including overhead lines and cable lines. Different models of equipment are installed for different application scenarios, greatly improving the generality and on-site construction success rate. The implementation of the method of the present invention is not restricted by the line topology connection method. Whether it is a radial, loop or mesh topology structure, as long as the sectional points can be reasonably determined and the corresponding metering equipment is installed, sectional metering can be achieved.

[0067] In the first embodiment of the present invention, the sectional metering method is applied to the urban power grid. The urban power grid has a complex network structure and diverse power consumption demands, with extremely high requirements for refined line loss management. The traditional line loss calculation method at the overall power grid level can only calculate the line loss of the entire line, unable to achieve precise metering and analysis of each section of the line, and it is difficult to locate the interval where abnormal line loss occurs.

[0068] The present invention divides the power grid into multiple refined management areas according to the geographical distribution and voltage level of the urban power grid, and each area independently calculates and manages the line loss. On each main power supply line, multiple metering sections are intelligently divided according to the load distribution and power grid structure, and high-precision metering devices are installed in each metering section to collect current and voltage data in real time. Massive amounts of collected data are deeply mined and analyzed to identify potential line loss abnormal points and optimization spaces.

[0069] In the second embodiment of the present invention, the sectional metering method is applied to the rural power grid. The rural power grid has long lines, wide distribution, scattered loads, and relatively weak infrastructure. Although the traditional line loss calculation method at the overall power grid level and manual inspection can be used to manage the line loss problem of the rural power grid, this method has disadvantages such as low calculation accuracy, low efficiency, and high cost. Especially when facing the complex and changeable rural power grid, the traditional method is often incompetent.

[0070] According to the actual situation of rural power grids, the present invention flexibly divides metering sections to ensure relatively balanced load distribution within each metering section, which is convenient for management and maintenance. In rural power grids, due to long lines and many branches, the corresponding relationship between lines and transformers is often complex and difficult to accurately identify. Through line-transformer relationship identification technology, the relationship between each line and the corresponding transformer is automatically determined.

[0071] In the second aspect of the present invention, there is provided an electric energy metering system with a power supply station as the smallest unit. The system is implemented by using an electric energy metering method with a power supply station as the smallest unit in the first aspect of the present invention. The system includes metering devices and a metering platform. The metering devices are installed at pre-selected sectional metering points. The metering platform establishes a sectional line model based on the position information of the sectional metering points and the association information between the sectional metering points. Moreover, the metering platform collects the electric energy metering information of the sectional metering points corresponding to the metering devices. There are data interfaces between the metering platform and the marketing system and the acquisition system, and preset model parameters are imported into the sectional line model through the data interfaces. The metering platform calculates the power supply information of the line section between any two adjacent sectional metering points based on the electric energy metering information and the sectional line model, detects the power consumption information and loss information of the line section based on the power supply information of the line section and the preset model parameters, and implements control over the 10kV line based on the power supply information, power consumption information and loss information of the line section.

[0072] In the third aspect of the present invention, there is provided a metering device, which includes a processor and a storage medium. The device includes a first split-core current sensor, a second split-core current sensor, a first phase voltage sensor, a second phase voltage sensor, and a wireless communication unit. The storage medium is used to store the electric energy metering information collected by the sensors and the metering instructions sent by the wireless communication unit. The wireless communication unit is used to upload the electric energy metering information or receive metering instructions. The processor is used to operate according to the instructions to execute the steps of the method in the first aspect of the present invention.

[0073] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them. Although the present invention has been described in detail with reference to the above embodiments, those of ordinary skill in the art should understand that there are still contents in the technical solutions of the present invention that can modify the specific implementation manners of the present invention or make equivalent replacements. Any modification or equivalent replacement that does not deviate from the spirit and scope of the present invention shall be covered by the protection scope of the claims of the present invention.

Claims

1. A method for measuring electric energy with a power supply station as the smallest unit, characterized in that: The method comprises the following steps: During the line inspection, segmented metering points are selected in sequence from the outgoing line end of the 10kV transformer in the load direction, and metering equipment is installed at the segmented metering points; Establishing a segmented line model according to the location information of the segmented metering points and the association information between the segmented metering points, and importing preset model parameters into the segmented line model; Collecting electric energy metering information of the segmented metering points corresponding to the metering equipment, and calculating the power supply information of the line segment between any two adjacent segmented metering points according to the electric energy metering information and the segmented line model; Detecting power consumption information and loss information of the line segment based on the power supply information of the line segment and the preset model parameters; The 10kV line is managed and controlled based on the power supply information, power consumption information and loss information of the line section.

2. The method for measuring electric energy with a power supply station as the smallest unit according to claim 1, characterized in that: In the process of line inspection, segmented metering points are selected in sequence from the outgoing line end of the 10kV transformer in the load side, including: Extract all important load access points and all line branch points on the transmission line where the load exceeds a preset amount, and set a first section metering point upstream of the important load access points and the line branch points; Calculate the distance between any two adjacent first segment measurement points, take the minimum distance as the target, and add one or more second segment measurement points between the sparsely adjacent first segment measurement points to ensure that the distance between any two segment measurement points is close to the minimum distance within the range of a preset difference amount; If there are different types of loads between any two segmented metering points, a third segmented metering point is added between the different types of loads.

3. The method for measuring electric energy with a power supply station as the smallest unit according to claim 2, characterized in that: In the process of line inspection, segmented metering points are selected in sequence from the outgoing line end of the 10kV transformer in the load side, including: Allocating location information and associated information to each of the segmented metering points; The location information includes one or more of the following information: the 10kV line where the segment metering point is located, the line-to-transformer relationship of the 10kV line, the geographical location of the segment metering point, and the upstream and downstream load user numbers of the segment metering point; The association information includes an upstream metering point and a downstream metering point of the segmented metering point.

4. The method for measuring electric energy with a power supply station as the smallest unit according to claim 3, characterized in that: The metering equipment is installed at the segmented metering point, including: In the three-phase AC circuit at the segmented metering point, an open current sensor is installed on any two phases, and a phase-to-phase voltage sensor is installed between any two phases and the remaining phase; Connecting the opening current sensor and the voltage sensor to a wireless communication unit respectively; The corresponding relationship between the wireless communication unit and the segmented metering points is configured, and the wireless communication unit is connected to the metering platform.

5. The method for measuring electric energy with a power supply station as the smallest unit according to claim 4, characterized in that: The step of establishing a segmented line model according to the location information of the segmented metering points and the association information between the segmented metering points, and importing preset model parameters into the segmented line model, comprises: The metering platform collects the location information and associated information sent by the segmented metering points, and establishes a segmented line model based on the location information and associated information; When there is a difference between the topological structure of the segmented line model and the pre-established substation archive information in the marketing system and the collection system, prompting the marketing system and the collection system with the substation archive update information; Importing the purchased electricity amount of load users from the marketing system to the metering platform, and importing the consumed electricity amount of load users from the collection system to the metering platform; The location information of the segmented metering points is used to correspond the purchased electricity amount and the consumed electricity amount of the load user to the line segment between any two adjacent segmented metering points, so as to inject the preset model information into the segmented line model.

6. The method for measuring electric energy with a power supply station as the smallest unit according to claim 5, characterized in that: The collecting of electric energy metering information of the segmented metering points corresponding to the metering equipment and calculating the power supply information of the line segment between any two adjacent segmented metering points according to the electric energy metering information and the segmented line model include: The phase current and phase-to-phase voltage of the segmented metering point collected by the open current sensor and the phase-to-phase voltage sensor; Use phase current and phase voltage to calculate active power, reactive power, apparent power, and power supply in a preset period at the segmented metering point; The difference in power supply between the upstream segment metering point and the adjacent downstream segment metering point is calculated to obtain the power supply information of the corresponding line segment.

7. The method for measuring electric energy with a power supply station as the smallest unit according to claim 6, characterized in that: The detecting the power consumption information and loss information of the line segment based on the power information of the line segment and the preset model parameters includes: The power consumption information of the line segment is obtained by extracting the power purchase amount of the load users in the line segment from the preset model parameters; The loss information of the line segment is obtained by calculating the line loss rate of the line segment using the power supply information and the power purchase information.

8. The method for measuring electric energy with a power supply station as the smallest unit according to claim 7, characterized in that: The controlling and managing of the 10kV line based on the power supply information, power consumption information and loss information of the line segment includes: The control includes: When the difference between the power supply information and the power consumption information of any line segment exceeds a first preset threshold, the difference is extracted, and when the number of times the difference exceeds a preset number, a suggestion for changing the line segment capacity is reported; When the loss information of any line segment exceeds a second preset threshold, the loss information is immediately extracted and an abnormal line loss warning of the line segment is issued.

9. An electric energy metering system with a power supply station as the smallest unit, characterized in that: The system is implemented by using an electric energy metering method with a power supply station as the smallest unit as described in any one of claims 1 to 8; The system includes a metering device and a metering platform; The metering equipment is installed on the pre-selected segmented metering points; The metering platform establishes a segmented line model according to the location information of the segmented metering points and the association information between the segmented metering points; and the metering platform collects the electric energy metering information of the segmented metering points corresponding to the metering equipment; There is a data interface between the metering platform and the marketing system and the collection system, and preset model parameters are imported into the segmented line model through the data interface; The metering platform calculates the power supply information of the line segment between any two adjacent segmented metering points based on the electric energy metering information and the segmented line model, detects the power consumption information and loss information of the line segment based on the power supply information of the line segment and the preset model parameters, and implements management and control of the 10kV line based on the power supply information, power consumption information and loss information of the line segment.

10. A measuring device, comprising a processor and a storage medium; characterized in that: The device includes a first opening current sensor, a second opening current sensor, a first phase-to-phase voltage sensor, a second phase-to-phase voltage sensor, and a wireless communication unit; The storage medium is used to store the electric energy metering information collected by the sensor and the metering instructions issued by the wireless communication unit; The wireless communication unit is used to upload the electric energy metering information or receive metering instructions; The processor is configured to operate according to the instructions to execute the steps of the method according to any one of claims 1-8.

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