Power transmission and transformation project safety evaluation method based on power distribution system safety domain and related system

Abstract

The invention relates to the field of power transmission and transformation safety, and discloses a power transmission and transformation project safety evaluation method based on a power distribution system safety domain and a related system, the power distribution system safety domain is adopted, and compared with a traditional point-by-point method, the power distribution system safety domain (DSSR) depicts the overall boundary of power distribution system operation, and the power transmission and transformation project safety evaluation method based on the power distribution system safety domain is obtained. And a brand-new visual angle and a quantization tool are provided for safety analysis. The power distribution system security domain (DSSR) avoids tedious fault N-1 simulation one by one, and significantly improves the speed and efficiency of security analysis. The introduction of the DSSR provides a new perspective for observing and analyzing the power distribution network, and is helpful for deeply knowing the rule and mechanism of the power distribution system. By observing the security domain, the defects of the power distribution network which are difficult to find by a traditional method can be found, and the hidden rule and mechanism of the power distribution network are revealed more comprehensively.

Description

Technical Field

[0001] The present invention belongs to the field of power transmission and transformation safety, and specifically relates to a power transmission and transformation engineering safety evaluation method based on a power distribution system safety domain and a related system. Background Art

[0002] At present, many urban distribution networks in China have or are in the process of large-scale distribution automation construction. After automation is realized, dispatchers can obtain real-time information of the power grid more widely and timely. Intelligent switches upgrade on-site manual operations to remote automatic operations. The distribution network can realize the rapid transfer of loads between different substations through feeder connections. These changes provide conditions for the development of new distribution network operation technologies. The distribution network safety region (DSSR) that has emerged in recent years provides a new theoretical method for future distribution operations. The DSSR theory can pre-calculate the safety boundary and realize rapid safety assessment; the safety domain visualization technology enables dispatchers to intuitively observe the current status and take measures to correct it in advance, ensuring that all non-fault loads can be safely transferred after N-1 faults.

[0003] The document "Safe and Efficient Operation Mode of Smart Distribution Network Based on Security Domain" points out that the future smart distribution network can operate more safely and efficiently with the support of these new theories and technologies. The document "Distribution management system framework based on security region for future low carbon distribution systems" further provides a safe and efficient implementation method, proposes the concept of a safe and efficient operation platform for smart distribution networks based on DSSR, and explores the establishment of a smart distribution network security control and defense system similar to the transmission network security system. Foreign research also believes that it is necessary for future distribution networks to achieve observable controllability similar to that of transmission networks.

[0004] At present, many urban distribution networks have completed large-scale construction and transformation, and the safety and efficiency issues in distribution operation are gradually becoming prominent. The traditional N-1 safety evaluation still has certain shortcomings: 1) Limitations in Definition and Understanding Although the N-1 principle is widely accepted and applied in the power industry, different companies, departments and technicians have different understandings of its definition. In terms of ensuring grid stability, the N-1 principle has received sufficient attention, but there is still a lack of understanding in ensuring continuous power supply to users, especially those in remote areas. This will lead to insufficient consideration of the power supply reliability for users in remote areas in grid planning, design and operation. 2) Challenges in practical applications When N-1 verification is performed on all lines, the network needs to perform multiple disconnection analyses, and the computing workload is very large, which not only increases the burden on planners, but also affects the efficiency and accuracy of planning work to a certain extent. Moreover, with the continuous expansion and complexity of the power grid, the difficulty of N-1 verification is also increasing, especially for large and complex power grid systems, it may become very difficult to conduct a comprehensive N-1 verification. Summary of the invention

[0005] The purpose of the present invention is to overcome the shortcomings of the above-mentioned prior art in that the power supply reliability of users in remote areas is not fully considered and comprehensive N-1 verification is difficult to carry out, and to provide a power transmission and transformation project safety evaluation method and related system based on the distribution system safety domain.

[0006] In order to achieve the above object, the present invention adopts the following technical solution: In a first aspect, the present invention provides a method for evaluating the safety of a power transmission and transformation project based on a power distribution system safety domain, comprising the following steps: Obtain the load data of the preset distribution network and working points, as well as the communication relationship between substations in the regional distribution network; Based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network, write the distribution system security domain; According to the inherent properties of the power distribution system safety domain, the boundary point distance, safety distance and depression point of the power distribution system safety domain are calculated; The boundary point distance, safety distance and depression point of the distribution system safety domain are observed by taking the whole domain as the unit and the boundary as the unit to obtain the overall indirect observation results; Compress the distribution system safety domain with the preset working point as the coordinate to obtain the compressed view, conduct special analysis on the working point, and obtain the local direct observation results; Supplementary observation method is carried out through TSC curve to obtain supplementary observation results; Based on the overall indirect observation results, local direct observation results and supplementary observation results, a comprehensive index describing the security domain status of the distribution system is obtained; According to the inherent properties of the distribution system safety domain, the volume index describing the state of the distribution system safety domain is obtained by combining the overall indirect observation results, local direct observation results and supplementary observation results. According to the comprehensive indicators and volume indicators, the operating status of the distribution network and the working point is judged, and the problems existing in the power transmission and transformation project are obtained according to the operating status of the distribution network and the working point.

[0007] A further improvement of the present invention is that when the load data of the preset distribution network and the working point are obtained, the working point perspective is determined according to the grid structure of the distribution network, and the working point perspective includes nodes, feeder segments or feeders.

[0008] A further improvement of the present invention is that the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network are substituted into the distribution system safety domain calculation formula to list the distribution system safety domain.

[0009] A further improvement of the present invention is that the boundary point distance, safety distance and concave point of the safety domain of the power distribution system are observed with the entire domain as a unit, and a domain spiral diagram and a boundary concave view are obtained; The boundary point distance, safety distance and depression point of the distribution system safety domain are observed with the boundary as the unit, and the boundary radar map and strict boundary point depression view are obtained.

[0010] A further improvement of the present invention is that the domain spiral map and the boundary depression view are used to obtain different depression boundary numbers and body surface ratio indicators, and the boundary radar map and the strict boundary point depression view are used to obtain different depression rates, depression depths and roundness indicators.

[0011] A further improvement of the present invention is that the safety domain of the power distribution system is compressed with preset working points as coordinates to obtain compressed two-dimensional views and three-dimensional views, and a special analysis of the working points is performed based on the compressed two-dimensional views and three-dimensional views.

[0012] A further improvement of the present invention is that the comprehensive indicators describing the status of the distribution system safety domain include the domain spiral diagram area, the distribution system safety domain radius, the distribution system safety domain surface area, the distribution system safety domain volume and the domain two-dimensional view area.

[0013] In a second aspect, the present invention provides a power transmission and transformation project safety evaluation system based on a power distribution system safety domain, comprising: A data acquisition module is used to obtain the load data of the preset distribution network and working point, as well as the communication relationship between substations in the regional distribution network; The distribution system safety domain acquisition module is used to obtain the distribution system safety domain based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network; An inherent attribute acquisition module, used to obtain the boundary point distance, safety distance and depression point of the power distribution system safety domain according to the inherent attributes of the power distribution system safety domain; The overall indirect observation module is used to observe the boundary point distance, safety distance and depression point of the distribution system safety domain in units of the entire domain and the boundary to obtain the overall indirect observation results; The local direct observation module is used to compress the safety domain of the power distribution system with the preset working point as the coordinate, obtain the compressed view, conduct special analysis on the working point, and obtain the local direct observation result; The supplementary observation module is used to perform a supplementary observation method through the TSC curve to obtain supplementary observation results; A comprehensive index acquisition module is used to obtain a comprehensive index describing the safety domain status of the distribution system based on the overall indirect observation results, the local direct observation results and the supplementary observation results; A volume index acquisition module is used to obtain a volume index describing the state of the distribution system safety domain according to the inherent properties of the distribution system safety domain, combined with the overall indirect observation results, the local direct observation results and the supplementary observation results; The operation status acquisition module is used to judge the operation status of the distribution network and the working point according to the comprehensive indicators and volume indicators, and obtain the problems existing in the power transmission and transformation project according to the operation status of the distribution network and the working point.

[0014] In a third aspect, the present invention provides an electronic device including a memory and a processor, wherein the memory stores a computer program, and the processor implements the steps of a method for evaluating the safety of a power transmission and transformation project based on a power distribution system safety domain when executing the computer program.

[0015] In a fourth aspect, the present invention provides a storage medium having a computer program stored thereon, which, when executed by a processor, implements the steps of a method for evaluating the safety of a power transmission and transformation project based on a power distribution system safety domain.

[0016] Compared with the prior art, the present invention has the following beneficial effects: The present invention adopts the distribution system safety region. Compared with the traditional point-by-point method, the distribution system safety region (DSSR) provides a new perspective and quantitative tool for safety analysis by characterizing the overall boundary of the distribution system operation. The distribution system safety region (DSSR) avoids the cumbersome N-1 simulation of each fault, and significantly improves the speed and efficiency of safety analysis. The introduction of the distribution system safety region (DSSR) of the present invention provides a new perspective for observing and analyzing the distribution network, which helps to gain a deeper understanding of the laws and mechanisms of the distribution system. By observing the safety domain, it is possible to discover distribution network defects that are difficult to discover with traditional methods, and to more comprehensively reveal the hidden laws and mechanisms of the distribution network.

[0017] Furthermore, the distribution system safety region (DSSR) used in the present invention contains the safety analysis information of all working points in the distribution operation state space, and is a complete mapping of key information such as the structure and capacity of the distribution network in terms of safety. The spatial geometric attributes of the distribution system safety region (DSSR), such as shape, volume, and radius, intuitively reflect the structure and safety characteristics of the distribution network. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] Figure 1 is a flow chart of Example 1; Figure 2 is a system diagram of Example 2; Figure 3It is the feeder load schematic diagram; Figure 4 This is the main connection diagram of the main transformer and its 10 kV line in the power supply area of ​​a 110 kV substation; Figure 5 It is the radius line graph of the working points P1 and P2 in the safety zone; Figure 6 Radar chart of the radius of the safety zone working points P1 and P2; Figure 7 This is a system diagram of Example 5. DETAILED DESCRIPTION

[0019] In order to further understand the content of the present invention, the present invention is described in detail below in conjunction with the accompanying drawings and specific embodiments. It should be understood that the embodiments are only for explaining the present invention and are not intended to limit it.

[0020] Embodiment 1: See also Figure 1 ,The safety evaluation method for power transmission and transformation engineering based on the safety domain of the power distribution system includes the following steps: S1, obtain the load data of the preset distribution network and working point, as well as the communication relationship between substations in the regional distribution network.

[0021] S2, based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network, list the distribution system safety domain.

[0022] S3, according to the inherent properties of the power distribution system safety domain, the boundary point distance, safety distance and depression point of the power distribution system safety domain are obtained.

[0023] S4, the boundary point distance, safety distance and depression point of the distribution system safety domain are observed in units of the entire domain and the boundary to obtain the overall indirect observation results.

[0024] S5, compress the safety domain of the distribution system with the preset working point as the coordinate, obtain the compressed view, conduct special analysis on the working point, and obtain the local direct observation results.

[0025] S6, a supplementary observation method is performed through the TSC curve to obtain a supplementary observation result.

[0026] S7, based on the overall indirect observation results, local direct observation results and supplementary observation results, a comprehensive indicator describing the safety domain status of the distribution system is obtained.

[0027] S8, according to the inherent properties of the distribution system safety domain, combined with the overall indirect observation results, local direct observation results and supplementary observation results, a volume index describing the state of the distribution system safety domain is obtained.

[0028] S9, based on the comprehensive indicators and volume indicators, judge the operating status of the distribution network and the working point, and obtain the problems existing in the power transmission and transformation project based on the operating status of the distribution network and the working point.

[0029] The method of the present invention analyzes the safety domain of the distribution system from multiple angles and levels, including inherent attributes (boundary point distance, safety distance, depression point) and its observation results (overall indirect observation, local direct observation and supplementary observation). This method covers all aspects of system operation and provides a more comprehensive safety assessment. By combining the inherent attributes of the safety domain of the distribution system with the comprehensive observation results, the method can accurately identify potential problems in the operation of the distribution network, such as possible depressions, abnormal communication between substations, etc. In particular, by combining multiple observation methods (overall, local, supplementary), the limitations of a single observation method can be avoided, thereby improving the accuracy of problem identification. The method not only studies the geometric and mathematical properties of the safety domain (such as boundary points, safety distances, depression points), but also observes from the overall and local perspectives, compresses high-dimensional data to form two-dimensional and three-dimensional views, and displays the operating status of the working point in an intuitive way. The multi-dimensional data processing method enables complex system characteristics to be effectively analyzed. By compressing and analyzing the preset working point as the coordinate, the method can dynamically adapt to different working points and different load conditions, and has high flexibility. This means that when facing a complex distribution network, this method can adjust strategies according to different research objects to ensure the effectiveness and applicability of the evaluation results. Through a comprehensive analysis of the system's operating status, hidden dangers that may affect the reliability and stability of the system can be better identified, and targeted optimization suggestions can be put forward, thereby improving the safety and stability of the distribution system. This method is not limited to identifying problems, but also focuses on the long-term and stable operation of the system. This method also focuses on the efficiency and balance of the distribution network operation. It not only considers safety issues, but also evaluates whether the system is operating efficiently and whether the load is evenly distributed. This comprehensive evaluation can provide a more comprehensive reference for system optimization. Through the calculation of comprehensive indicators and volume indicators, the current operating status of the distribution network can be clarified, and possible safety hazards can be quantitatively analyzed. This proposes specific optimization directions for problems in power transmission and transformation projects, making solutions for different systems and different problems clearer and more implementable. Supplementary observations (such as the use of TSC curves) can help discover details that may be missed in overall and local observations, reduce blind spots, and ensure the comprehensiveness and accuracy of the evaluation process. This helps avoid misjudgments due to insufficient data or analysis dimensions.

[0030] In conclusion, the advantage of this method lies in its ability to comprehensively and accurately evaluate the safety, reliability, efficiency and balance of power transmission and transformation projects in a multi-perspective, multi-dimensional and multi-indicator manner, and its ability to dynamically adapt to different working points and conditions, thus providing a scientific basis for system optimization and problem solving.

[0031] Embodiment 2: See also Figure 2 , a power transmission and transformation project safety evaluation system based on the power distribution system safety domain, including: A data acquisition module is used to obtain the load data of the preset distribution network and working point, as well as the communication relationship between substations in the regional distribution network; The distribution system security domain acquisition module is used to list the distribution system security domain based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network; An inherent attribute acquisition module, used to obtain the boundary point distance, safety distance and depression point of the power distribution system safety domain according to the inherent attributes of the power distribution system safety domain; The overall indirect observation module is used to observe the boundary point distance, safety distance and depression point of the distribution system safety domain in units of the entire domain and the boundary to obtain the overall indirect observation results; The local direct observation module is used to compress the safety domain of the power distribution system with the preset working point as the coordinate, obtain the compressed view, conduct special analysis on the working point, and obtain the local direct observation result; The supplementary observation module is used to perform a supplementary observation method through the TSC curve to obtain supplementary observation results; A comprehensive index acquisition module is used to obtain a comprehensive index describing the safety domain status of the distribution system based on the overall indirect observation results, the local direct observation results and the supplementary observation results; A volume index acquisition module is used to obtain a volume index describing the state of the distribution system safety domain according to the inherent properties of the distribution system safety domain, combined with the overall indirect observation results, the local direct observation results and the supplementary observation results; The operation status acquisition module is used to judge the operation status of the distribution network and the working point according to the comprehensive indicators and volume indicators, and obtain the problems existing in the power transmission and transformation project according to the operation status of the distribution network and the working point.

[0032] Embodiment 3: See also Figure 3 , the distribution system security domain is: The set of all operating points at which the distribution network can operate safely under the conditions that the distribution network operation constraints are met. The operation constraints mainly refer to the main transformer and feeder N-1 safety constraints.

[0033] Feeder N-1 verification safety means that when a single feeder fails at the outlet, all loads on the feeder can be transferred to other feeders connected to it. Main transformer N-1 verification safety means that when a single main transformer is out of operation, all loads of the main transformer are transferred to other main transformers in the station or to other substations through feeders. The distribution system safety domain model based on feeder interconnection considers the above two N-1 constraints at the same time.

[0034] The distribution system safety domain is the set of all operating points that satisfy the feeder and main transformer N-1. The operating point is represented by an n-dimensional vector, which is composed of the loads of each feeder. The operating point can be expressed as follows:

[0035] In the above formula, represents the operating point vector based on the feeder load, Indicates the feeder load. For a single-tie line, there is only one feeder partition. That is, the feeder outlet load. For multi-segment and multi-interconnection lines, the feeder load can be transferred to multiple lines through the interconnection switch. The load of a feeder section represents a load unit that can be transferred to other feeders. Taking the two sections and two connections in the following figure as an example, the load carried by feeder 1 can be transferred to feeder 2 and feeder 3 at the same time, so the working point components of feeder 1 have two components. and However, there is only one working point component for feeder 2 and feeder 3.

[0036] Under the constraints of the main transformer and line N-1 safety criteria, the distribution network security domain model can be expressed as:

[0037] in: Indicates the load carried by the i-th main transformer; represents the load carried by feeder No. m; It indicates the load transferred to feeder n when feeder m experiences N-1; It indicates the load brought to main transformer j by main transformer i undergoing N-1 transfer; represents the capacity of feeder n; Indicates the rated capacity of the main transformer i; Indicates main transformer i; Indicates that feeder m comes from the corresponding busbar of transformer i.

[0038] In the above formula, the first formula is the feeder load equation, which means that the outlet load of feeder m is equal to the sum of the loads of each feeder partition; The formula is the feeder N-1 constraint, which means that after an outlet fault occurs on feeder m, the load is transferred to other feeders through the tie switch, and other feeders are not overloaded after the transfer; The feeder capacity constraint when the main transformer is N-1. When the main transformer i is N-1, the load transferred to the main transformer j is completed by the load transfer between the feeders connected to the two main transformers; For the main transformer load equation, the load carried by the main transformer is equal to the sum of the loads of the feeders it outputs; The main transformer capacity constraint when main transformer N-1 means that main transformer j will not be overloaded after accepting all the loads transferred from faulty main transformer i.

[0039] Research shows that the DSSR boundary of the distribution system safety region also has the properties of linearity, compactness, connectivity, and no internal voids. Therefore, the DSSR can be described only by its boundary, and the formula is transformed as follows:

[0040] in, Each inequality is a boundary expression of the safety domain. Take the i-th inequality as an example to illustrate its meaning: represents the feeder load of feeder i. The first half of the comma on the right side of the inequality is the line N-1 constraint. Taking the i-th equation as an example, when a line outlet fault occurs on feeder i, The load is transferred to feeder m, and feeder m should not be overloaded. The second half of the comma on the right side of the inequality is the main transformer N-1 constraint. Main change Rated capacity. Taking the ith formula as an example, the main transformer of feeder line m The export feeder of the main transformer After a fault occurs, the main transformer Accepted the main change Because the safety constraints of feeder N-1 and main transformer N-1 must be met at the same time, the above inequality removes the minimum value of the two.

[0041] It can be seen that the safety boundary of the distribution system is composed of n inequalities, each of which represents a one-dimensional safety boundary, so the safety boundary is surrounded by an n-dimensional hyperplane. If the distribution network grid structure is determined, the safety boundary expression is also uniquely determined.

[0042] The safety level of the distribution network needs to determine the position of the working point in the safety domain. The position is represented by the distance q from the working point to the safety boundary, and its expression is as follows:

[0043] From the above formula, we can see that the distance from the working point to the safety boundary is It is essentially the load value between the working point and the safety boundary. is positive, the working point is in the safe region, Indicates the load margin from the working point to each boundary. At this time, the load value of the working point can continue to increase to improve the operating efficiency of the distribution network; if If the value is not all positive, the operating point is outside the safety boundary and is negative. The absolute value of indicates that the load value of the working point exceeds the boundary. Reducing the load value of the corresponding working point can bring the system back to the safe domain.

[0044] Embodiment 4: The present invention comprises the following steps: Step 1: List the distribution network security boundaries and security domains B i is the name of the security boundary, C i is the feeder rated capacity, L i is the maximum daily load of the feeder, R i is the rated capacity of the main transformer, P i The maximum daily load of the main transformer. Based on the theoretical calculation method of the distribution network safety domain and Figure 4 According to the connection relationship shown, the safety boundary expressions of each feeder of T1 main transformer are as follows.

[0045]

[0046]

[0047]

[0048] The safety boundary expressions of each feeder of T2 main transformer are shown in the following formula.

[0049]

[0050]

[0051]

[0052]

[0053] The safety boundary expressions of each feeder of T3 main transformer are shown as follows.

[0054]

[0055] The safety boundary expressions of each feeder of T4 main transformer are shown as follows.

[0056]

[0057]

[0058] The safety boundary expressions of each feeder of T5 main transformer are shown in the following formula.

[0059]

[0060] According to the above formula, by substituting the rated capacity and maximum daily load of the main transformers T1~T5 and feeders 11, 12, 13, 21, 22, 23, 24, 31, 41, 42, 51 in the power supply area, the distribution network security region can be obtained ( )as follows:

[0061] Step 2: Calculate the safety distance The geometric safety distance (GSD) calculation formula is as follows.

[0062]

[0063] in, As the coefficient, the geometric safety distance calculation is taken as 1. According to the above calculation formula, taking the maximum load day load as the working point P1 and B1 as an example, the geometric safety distance (GSD) is calculated.

[0064]

[0065] At the P1 working point, the geometric safety distance from the P1 working point to each safety boundary and the geometric safety distance after the working point moves from P1 to P2 at the average load rate are shown in the following table.

[0066] boundary <![CDATA[P1GSD(MVA)]]> <![CDATA[P2GSD(MVA)]]> Variable Value <![CDATA[B6]]> 1.78 4.74 2.96 <![CDATA[B7]]> 2.07 4.74 2.67 <![CDATA[B8]]> 0.37 5.1 4.73 <![CDATA[B9]]> 5.4 7.84 2.44 <![CDATA[B 10 ]]> 3 8.2 5.2 <![CDATA[B 11 ]]> 8.17 8.4 0.23 The safety distance obtained from the above table is shown in the following table.

[0067] Working point Safe distance Positive and negative distribution average value Median variance <![CDATA[P1]]> GSD 100% positive 3.07 2.71 4.63 <![CDATA[P2]]> GSD 100% positive 5.99 5.17 2.05 1) The positive or negative value of the safety distance can indicate whether the distribution network meets N-1 safety, and the positive or negative distribution can indicate the degree of insecurity.

[0068] Comparing the positive and negative distributions of working points P1 and P2, it can be seen that their GSDs (geometric safety distances) are all positive, indicating that both working points meet N-1 safety requirements under maximum load days and average load conditions.

[0069] 2) The average and median values ​​of the safety distance can represent the safety level of the distribution network.

[0070] From the average and median values ​​of working points P1 and P2, it can be seen that the average and median values ​​of working point P2 are greater than those of working point P1, that is, when the distribution network is in normal power consumption, that is, average load power consumption, the safety is higher than the working condition on the maximum load day.

[0071] 3) The variance of the safety distance can represent the degree of balance of load distribution.

[0072] The smaller the variance of the safety distance, the more uniform the distance distribution from the working point to the safety boundary, and the more uniform the load distribution. The variance of the safety distance of working point P2 is smaller than that of working point P1, indicating that the load distribution of working point P2 is more balanced.

[0073] Step 3: Full-dimensional observation of the security domain DSSR can be approximated as a high-dimensional polyhedron formed by cutting many hyperplanes. Starting from the geometric center point of the polyhedron, the Euclidean distance from the center point to the safety boundary can be calculated, that is, the geometric safety distance from the center point to the safety boundary. This distance is geometrically equivalent to the radius of DSSR, and its size and balance can reflect the concavity and roundness of the domain: the smaller the radius, the deeper the concavity; the more uneven the distribution, the worse the roundness. The roundness and symmetry of the safety domain can reflect the balance of the load and the symmetry of the power grid wiring layout, that is, the more even the load distribution, the more symmetrical the power grid structure, and the more rounded and symmetrical the safety domain.

[0074] Since the safety domain of the traditional distribution network is only located in the first quadrant of the state space, it is more reasonable to use the safety distance from the origin (i.e., zero load point) to the boundary as the radius than the center point distance. For the developing source-containing distribution network, whose safety domain is the full-quadrant safety domain, the safety distance from the center point to the boundary should be used as the radius. After obtaining the DSSR radius corresponding to all boundaries, further processing is performed. On the one hand, direct visual observation is performed; on the other hand, in-depth statistical processing data is performed, and indicators are designed to quantify the depression and geometric characteristics of the domain. Finally, the cause of the depression is analyzed, and an improvement plan is given. Then, the improved power grid is fully observed and the improvement effect is compared.

[0075] The equivalent radius of the safety domain for full-dimensional observation of the safety domain is shown in the following table.

[0076] boundary <![CDATA[P1 radius (MVA)]]> <![CDATA[P2 radius (MVA)]]> <![CDATA[B1]]> 3.43 6.47 <![CDATA[B2]]> 4.3 4.87 <![CDATA[B3]]> 2.71 5.17 <![CDATA[B4]]> 0.48 4.47 <![CDATA[B5]]> 2.07 5.93 <![CDATA[B6]]> 1.78 4.74 <![CDATA[B7]]> 2.07 4.74 <![CDATA[B8]]> 0.37 5.1 <![CDATA[B9]]> 5.4 7.84 <![CDATA[B 10 ]]> 3 8.2 <![CDATA[B 11 ]]> 8.17 8.4 In addition to the average radius, maximum radius and minimum radius, this topic also defines two indicators, namely the degree of concavity and the degree of roundness, to describe the geometric properties of the distribution safety domain.

[0077] 1) Security domain depression index Define a certain proportion of the average radius of the safety zone as the concavity threshold (CT), that is,

[0078] In the formula, The proportionality factor is similar to the method of evaluating the degree of concavity of the pipeline wall.

[0079] The concavity threshold calculated according to the above formula demarcates the concavity standard of the safety zone, and the safety boundary corresponding to the radius less than the concavity threshold is defined as the concavity boundary. The concavity boundary number (CBN) calculation formula is:

[0080] 2) Security domain roundness index The shape distortion index (SDI) formula is defined as:

[0081] The shape distortion index obtained according to the origin safety distance represents the average deviation between the distance from the origin to the effective safety boundary and its mean, which can measure the roundness of the overall shape of the DSSR. The closer its value is to 0, the rounder the DSSR is. For a completely symmetrical ideal safety domain, its SDI index is 0, and its shape is approximately a high-dimensional spherical pyramid. It should be pointed out that the radius variance can also represent the degree of discreteness of the data, but its measurement unit and dimension are less intuitive than the shape distortion index.

[0082] The practical value of the safety domain roundness index is that it will add a new index to the distribution network evaluation and planning scheme optimization. The roundness is likely to have a strong correlation with the network structure and capacity matching. The distribution network with a high degree of roundness has a better structure and capacity matching and a more balanced safety range.

[0083] Safety zone radius line chart and radar chart Figure 5 , Figure 6 shown.

[0084] From the table and figure, we can get the proportional coefficient of the concave threshold , the full-dimensional observation indicators of the safety domain of working points P1 and P2 are calculated, and the specific indicators are shown in the following table.

[0085] Working point Average radius Maximum Radius minimum radius Sag Threshold Number of concave boundaries Shape distortion <![CDATA[P1]]> 3.07 8.17 0.37 2.763 6 0.000296 <![CDATA[P2]]> 5.99 8.4 4.47 5.391 6 0.000607 Depend on Figure 5 and Figure 6Analysis shows that although the safety distances of the B4 and B8 boundaries under the working point P1 are positive, the safety distances are small, only 0.48MVA and 0.37MVA, which are far lower than the average radius and the concave threshold. The safety constraint of B4 is ,Analysis of its safety constraints shows that the load of line 4 on the maximum load day is too high, reaching 5.32MW, the line rated capacity is 5.8MW, the line load rate is 91.8%, and the line is overloaded. The safety constraints of B8 are ,Analysis of its safety constraints shows that the load of T3 on the maximum load day is too high, reaching 5.93MW. The rated capacity of the main transformer is 6.3MW, the load rate of the main transformer is 94.13%, and the main transformer is overloaded. The shape distortion index value of the working point P1 is 0.000296, and the number of concave boundaries is 6, that is, the shape symmetry of the safety domain of the working point P1 is high, but not round enough, and there are many concave boundaries.

[0086] Although the safety distances of the boundaries of B2, B4, B6, and B7 under working point P2 are positive, the safety distances are significantly smaller than the depression threshold, which are 4.87MVA, 4.47MVA, 4.74MVA, and 4.74MVA, all less than 5MVA, and lower than the average radius and depression threshold. Although the safety distances of the boundaries of B2, B4, B6, and B7 are all smaller than the depression threshold and average distance, and the number of depression boundaries is 6, the shape distortion index value is 0.000607. The shape symmetry of the safety domain of working point P2 is high, and the shape is round. There are more depression boundaries but the difference is small. However, the comprehensive line and main transformer capacity can still be judged. When the distribution system in the area operates normally under average load, the system safety is high and there is no dangerous boundary for the time being.

[0087] Embodiment 5: See also Figure 7 As shown, the present invention also provides an electronic device 100 for a power transmission and transformation project safety evaluation method based on a power distribution system safety domain; the electronic device 100 includes a memory 101, at least one processor 102, a computer program 103 stored in the memory 101 and executable on the at least one processor 102, and at least one communication bus 104.

[0088] The memory 101 can be used to store the computer program 103, and the processor 102 implements the steps of the power transmission and transformation project safety evaluation method based on the power distribution system safety domain described in Example 1 by running or executing the computer program stored in the memory 101 and calling the data stored in the memory 101. The memory 101 can mainly include a program storage area and a data storage area, wherein the program storage area can store an operating system, an application required for at least one function (such as a sound playback function, an image playback function, etc.), etc.; the data storage area can store data (such as audio data) created according to the use of the electronic device 100, etc. In addition, the memory 101 can include a non-volatile memory, such as a hard disk, a memory, a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), at least one disk storage device, a flash memory device, or other non-volatile solid-state storage devices.

[0089] The at least one processor 102 may be a central processing unit (CPU), or other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The processor 102 may be a microprocessor or any conventional processor, etc. The processor 102 is the control center of the electronic device 100, and uses various interfaces and lines to connect various parts of the entire electronic device 100.

[0090] The memory 101 in the electronic device 100 stores a plurality of instructions to implement a power transmission and transformation project safety evaluation method based on a power distribution system safety domain, and the processor 102 can execute the plurality of instructions to implement: Obtain the load data of the preset distribution network and working points, as well as the communication relationship between substations in the regional distribution network; Based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network, the distribution system security domain is obtained; According to the inherent properties of the power distribution system safety domain, the boundary point distance, safety distance and depression point of the power distribution system safety domain are obtained; The boundary point distance, safety distance and depression point of the distribution system safety domain are observed by taking the whole domain as the unit and the boundary as the unit to obtain the overall indirect observation results; Compress the distribution system safety domain with the preset working point as the coordinate to obtain the compressed view, conduct special analysis on the working point, and obtain the local direct observation results; Supplementary observation method is carried out through TSC curve to obtain supplementary observation results; Based on the overall indirect observation results, local direct observation results and supplementary observation results, a comprehensive index describing the security domain status of the distribution system is obtained; According to the inherent properties of the distribution system safety domain, the volume index describing the state of the distribution system safety domain is obtained by combining the overall indirect observation results, local direct observation results and supplementary observation results. According to the comprehensive indicators and volume indicators, the operating status of the distribution network and the working point is judged, and the problems existing in the power transmission and transformation project are obtained according to the operating status of the distribution network and the working point.

[0091] Embodiment 6: If the module / unit integrated in the electronic device 100 is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the present invention implements all or part of the process in the above-mentioned embodiment method, and can also be completed by instructing the relevant hardware through a computer program. The computer program can be stored in a computer-readable storage medium, and the computer program can implement the steps of the above-mentioned method embodiments when executed by the processor. Among them, the computer program includes computer program code, and the computer program code can be in source code form, object code form, executable file or some intermediate form. The computer-readable medium may include: any entity or device that can carry the computer program code, recording medium, U disk, mobile hard disk, disk, optical disk, computer memory and read-only memory (ROM, Read-Only Memory).

[0092] It will be appreciated by those skilled in the art that embodiments of the present invention may be provided as methods, systems, or computer program products. Therefore, the present invention may take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware. Furthermore, the present invention may take the form of a computer program product implemented on one or more computer-usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0093] The present invention is described with reference to flowcharts and / or block diagrams of methods, devices (systems), and computer program products according to embodiments of the present invention. It should be understood that each process and / or block in the flowchart and / or block diagram, as well as the combination of processes and / or blocks in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the processes in the flowchart and / or block diagram. Figure 1 A process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0094] These computer program instructions may also be stored in a computer-readable memory capable of directing a computer or other programmable data processing device to operate in a specific manner, so that the instructions stored in the computer-readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 A process or multiple processes and / or boxes Figure 1 A function specified in one or more boxes.

[0095] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operating steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing instructions for implementing the process. Figure 1 A process or multiple processes and / or boxes Figure 1 The steps for the functions specified in one or more boxes.

[0096] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention rather than to limit it. Although the present invention has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that the specific implementation methods of the present invention can still be modified or replaced by equivalents. Any modification or equivalent replacement that does not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A power transmission and transformation project safety evaluation method based on the power distribution system safety domain is characterized by: The following steps are involved: Obtain the load data of the preset distribution network and working points, as well as the communication relationship between substations in the regional distribution network; Based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network, the distribution system security domain is obtained; According to the inherent properties of the power distribution system safety domain, the boundary point distance, safety distance and depression point of the power distribution system safety domain are obtained; The boundary point distance, safety distance and depression point of the distribution system safety domain are observed by taking the whole domain as the unit and the boundary as the unit to obtain the overall indirect observation results; Compress the distribution system safety domain with the preset working point as the coordinate to obtain the compressed view, conduct special analysis on the working point, and obtain local direct observation results; Supplementary observation method is carried out through TSC curve to obtain supplementary observation results; Based on the overall indirect observation results, local direct observation results and supplementary observation results, a comprehensive index describing the security domain status of the distribution system is obtained; According to the inherent properties of the distribution system safety domain, the volume index describing the state of the distribution system safety domain is obtained by combining the overall indirect observation results, local direct observation results and supplementary observation results. According to the comprehensive indicators and volume indicators, the operating status of the distribution network and the working point is judged, and the problems existing in the power transmission and transformation project are obtained according to the operating status of the distribution network and the working point.

2. The power transmission and transformation project safety evaluation method based on the power distribution system safety domain according to claim 1 is characterized in that: When obtaining the load data of the preset distribution network and the working point, the working point perspective is determined according to the grid structure of the distribution network. The working point perspective includes nodes, feeder segments or feeders.

3. The power transmission and transformation project safety evaluation method based on the power distribution system safety domain according to claim 1 is characterized in that: The load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network are substituted into the calculation formula of the distribution system safety domain to obtain the distribution system safety domain.

4. The power transmission and transformation project safety evaluation method based on the power distribution system safety domain according to claim 1 is characterized in that: The boundary point distance, safety distance and concave point of the distribution system safety domain are observed with the domain as a whole unit, and the domain spiral diagram and boundary concave view are obtained; The boundary point distance, safety distance and depression point of the distribution system safety domain are observed with the boundary as the unit, and the boundary radar map and strict boundary point depression view are obtained.

5. The power transmission and transformation project safety evaluation method based on the power distribution system safety domain according to claim 4 is characterized in that: The domain spiral diagram and boundary concave view were used to obtain different concave boundary numbers and body-to-surface ratio indices, and the boundary radar diagram and strict boundary point concave view were used to obtain different concave rates, concave depths, and roundness indices.

6. The power transmission and transformation project safety evaluation method based on the power distribution system safety domain according to claim 1 is characterized in that: The safety domain of the power distribution system is compressed with preset working points as coordinates to obtain compressed two-dimensional and three-dimensional views, and special analysis of the working points is performed based on the compressed two-dimensional and three-dimensional views.

7. The method for evaluating the safety of power transmission and transformation projects based on the power distribution system safety domain according to claim 1 is characterized in that: The comprehensive indicators describing the status of the safety domain of the distribution system include the domain spiral diagram area, the distribution system safety domain radius, the distribution system safety domain surface area, the distribution system safety domain volume and the domain two-dimensional view area.

8. The power transmission and transformation project safety evaluation system based on the power distribution system safety domain includes: A data acquisition module is used to obtain the load data of the preset distribution network and working point, as well as the communication relationship between substations in the regional distribution network; The distribution system safety domain acquisition module is used to obtain the distribution system safety domain based on the load data of the distribution network and the working point, as well as the communication relationship between substations in the regional distribution network; An inherent attribute acquisition module, used to obtain the boundary point distance, safety distance and depression point of the power distribution system safety domain according to the inherent attributes of the power distribution system safety domain; The overall indirect observation module is used to observe the boundary point distance, safety distance and depression point of the distribution system safety domain in units of the entire domain and the boundary to obtain the overall indirect observation results; The local direct observation module is used to compress the safety domain of the power distribution system with the preset working point as the coordinate, obtain the compressed view, conduct special analysis on the working point, and obtain the local direct observation result; The supplementary observation module is used to perform a supplementary observation method through the TSC curve to obtain supplementary observation results; A comprehensive index acquisition module is used to obtain a comprehensive index describing the safety domain status of the distribution system based on the overall indirect observation results, the local direct observation results and the supplementary observation results; A volume index acquisition module is used to obtain a volume index describing the state of the distribution system safety domain according to the inherent properties of the distribution system safety domain, combined with the overall indirect observation results, the local direct observation results and the supplementary observation results; The operation status acquisition module is used to judge the operation status of the distribution network and the working point according to the comprehensive indicators and volume indicators, and obtain the problems existing in the power transmission and transformation project according to the operation status of the distribution network and the working point.

9. An electronic device comprising a memory and a processor, wherein the memory stores a computer program, wherein: When the processor executes the computer program, the steps of the power transmission and transformation project safety evaluation method based on the power distribution system safety domain described in any one of claims 1 to 7 are implemented.

10. A storage medium having a computer program stored thereon, characterized in that: When the computer program is executed by a processor, the steps of the power transmission and transformation project safety evaluation method based on the power distribution system safety domain described in any one of claims 1 to 7 are implemented.

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