CN111105145B - Power grid survivability evaluation method considering intermittent energy - Google Patents
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Abstract
The invention discloses a power grid survivability evaluation method considering intermittent energy, which comprises the following steps: analyzing a power flow path in a planning scheme with intermittent energy accessed into a power grid to obtain the power proportion supplied by each power supply point to each load point; screening out key nodes and key branches of the planning scheme based on the power proportion supplied by each power supply point to each load point and the running state of the power grid; establishing a survivability evaluation sub-index model of the planning scheme based on the key nodes and the key branches of the planning scheme, and obtaining the result of the model through calculation; performing per-unit processing on the result of the model, and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient; and evaluating the quality condition of the planning scheme with the intermittent energy accessed to the power grid based on the survivability comprehensive index of the planning scheme. In the implementation of the invention, the method provides a beneficial reference for power grid planning.
Description
Technical Field
The invention relates to the technical field of power grid planning evaluation, in particular to a power grid survivability evaluation method considering intermittent energy.
Background
With the continuous expansion of the scale of the power grid, the morphological expression of the power grid is more complex, the operation risk is gradually increased, the possibility that a local fault is converted into a large-area power failure accident is increased, and the operation risk of the power grid is further aggravated by the increase of the permeability of intermittent new energy.
At present, power grid survivability evaluation at home and abroad is not defined authoritatively, students carry out research on the power grid survivability evaluation from different angles of power grid structure and operation, but in the existing survivability evaluation research, an intermittent energy source which is an important factor influencing the power grid operation risk is not taken into consideration independently, and the influence of the intermittent energy source on the power grid survivability is difficult to effectively evaluate.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a power grid survivability evaluation method considering intermittent energy.
In order to solve the above technical problem, an embodiment of the present invention provides a power grid survivability assessment method considering intermittent energy, where the method includes:
carrying out tidal current path analysis on a planning scheme with intermittent energy accessed into a power grid to obtain the power proportion supplied by each power supply point to each load point;
screening out key nodes and key branches of the planning scheme based on the power proportion supplied by each power supply point to each load point and the running state of the power grid;
establishing a survivability evaluation sub-index model of the planning scheme based on the key nodes and the key branches of the planning scheme, and obtaining the result of the survivability evaluation sub-index model of the planning scheme through calculation; the survivability evaluation sub-index model of the planning scheme comprises a power grid connectivity index model, a key node distance index model, a key branch distance index model, an intermittent energy distance index model and an intermittent energy dependency index model;
the calculation formula of the power grid connectivity index model is as follows:
the calculation formula of the key node distance degree index model is as follows:
the calculation formula of the key branch distance index model is as follows:
the calculation formula of the intermittent energy distance index model is as follows:
the calculation formula of the intermittent energy dependence index model is as follows:
wherein, C g Is the index of the connectivity of the power grid, N is the number of nodes of the power grid, V is the set of nodes of the power grid, k ij For node pair v i 、v j Connectivity in the grid; a. the bus As a key node distance index, N bus Is the number of key nodes, n i 、n j Is a key node, S is a set of key nodes，D ij Is a key node n i 、n j The spatial distance therebetween; a. the branch As a key branch distance index, N branch Is the key number of branches, b e 、b f Is a critical branch, T is a set of critical branches, D ef Is a critical branch b e 、b f The spatial distance therebetween; d ie As an indicator of distance to intermittent energy source, N ie The number of the intermittent energy sources accessed in the power grid, i is the intermittent energy source, w i The ratio of the rated capacity of the intermittent energy source i to the total capacity of the intermittent energy source d avr,i The average value of the space distance between the access point of the intermittent energy source i and the key node in the power grid is obtained; r is ie As an indicator of intermittent energy dependence, n load The power is derived from the number of load nodes of which the proportion of the intermittent energy source i is greater than a threshold k;
performing per-unit processing on the result of the survivability evaluation sub-index model of the planning scheme, and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient;
evaluating the quality condition of the planning scheme with the intermittent energy accessed to the power grid based on the survivability comprehensive index of the planning scheme; and evaluating the planning scheme based on the survivability comprehensive index of the planning scheme, wherein the larger the survivability comprehensive index is, the better the survivability of the planning scheme with the intermittent energy accessed to the power grid is.
Optionally, the performing the tidal current path analysis in the planning scheme that the intermittent energy is accessed to the power grid to obtain the power ratio supplied by each power supply point to each load point includes:
forming a power generation-load node pair set in a planning scheme with intermittent energy accessed into a power grid;
searching a power flow transmission path between any node pair in the power generation-load node pair set based on power flow distribution;
calculating to obtain the transmission power between each node pair based on the load flow transmission path between any node pair in the power generation-load node pair set;
and obtaining the power proportion supplied by each power supply point to each load according to the transmission power between each pair of nodes.
Optionally, the performing per unit processing on the result of the survivability evaluation sub-index model of the planning scheme, and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient includes:
performing per-unit processing on the result of the survivability evaluation sub-index model of the planning scheme, wherein the reference value of each index is the maximum value of the index in the calculation result of the planning scheme;
determining a weight coefficient of the reference value of each index based on a hierarchical analysis algorithm;
and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient of the standard value of each index.
Optionally, the calculation formula of the survivability comprehensive index of the planning scheme is as follows:
wherein S is a survivability comprehensive index of the planning scheme, and alpha 1 、α 2 、α 3 、α 4 、α 5 Decibel is the weight coefficient of the reference value of the connectivity, the distance degree of the key node, the distance degree of the key branch, the distance degree of the intermittent energy source and the index of the intermittent energy source dependence,
the per unit values are respectively the connectivity, the distance of the key nodes, the distance of the key branches, the distance of the intermittent energy sources and the index of the dependence of the intermittent energy sources.
In the implementation of the invention, a power grid survivability evaluation method considering intermittent energy establishes a power grid survivability evaluation model, comprehensively considers the structure and the operating characteristics of a power grid and the influence of the access of the intermittent energy, evaluates the survivability of a power grid planning scheme from multiple aspects of the power grid communication degree, the distribution of key nodes, key branches and the intermittent energy and the dependence degree of load on the intermittent energy, and provides beneficial reference for power grid planning.
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In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the embodiments or the prior art descriptions will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart of a method for assessing the survivability of a power grid in consideration of an intermittent energy source according to an embodiment of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Examples
Referring to fig. 1, fig. 1 is a schematic flowchart illustrating a method for assessing survivability of a power grid in consideration of intermittent energy according to an embodiment of the present invention.
As shown in fig. 1, a method for grid survivability assessment considering an intermittent energy source, the method comprising:
s11: carrying out tidal current path analysis on a planning scheme with intermittent energy accessed into a power grid to obtain the power proportion supplied by each power supply point to each load point;
in the specific implementation process of the present invention, the performing the tidal current path analysis in the planning scheme with the intermittent energy accessing to the power grid to obtain the power ratio supplied by each power supply point to each load point includes: forming a power generation-load node pair set in a planning scheme with intermittent energy accessed into a power grid; searching a power flow transmission path between any node pair in the power generation-load node pair set based on power flow distribution; calculating to obtain the transmission power between each node pair based on the load flow transmission path between any node pair in the power generation-load node pair set; and obtaining the power proportion supplied by each power supply point to each load according to the transmission power between each pair of nodes.
S12: screening out key nodes and key branches of the planning scheme based on the power proportion supplied by each power supply point to each load point and the running state of the power grid;
specifically, the key nodes include node distance degrees, node energy degrees, node pivot betweenness, node distance betweenness and node capacity betweenness; the node distance degree represents the total electrical distance of a branch circuit directly connected with the node i, and reflects the electrical distance range directly covered by a line directly connected with the node in a power grid; the node energy level represents the power transmission capacity of a branch directly connected with the node i, and reflects the branch transmission capacity provided by the node in a power grid; the node junction betweenness represents the ratio of the number of power transmission paths between power generation-load node pairs passing through a node i in the power grid to the total number of power transmission paths between all the power generation-load node pairs in the power grid; the node distance betweenness represents the ratio of the sum of power weighted transmission distances of paths between power generation-load node pairs passing through a node i in the power grid to the sum of power weighted transmission distances of transmission paths between all power generation-load node pairs in the power grid; the node capacity betweenness represents the ratio of the sum of the power weighted transmission capacities of paths between the power generation-load node pairs passing through the node i in the power grid to the sum of the power weighted transmission capacities of transmission paths between all the power generation-load node pairs in the power grid; the key branch comprises branch junction betweenness, branch distance betweenness and branch capacity betweenness; the branch junction betweenness represents the ratio of the number of power transmission paths between power generation-load node pairs communicated through a branch e in the power grid to the total number of power transmission paths between the power generation-load node pairs in the power grid; the branch distance betweenness represents the ratio of the sum of power weighted transmission distances of paths between power generation-load node pairs passing through a branch e in the power grid to the sum of power weighted transmission distances of power transmission paths between all power generation-load node pairs in the power grid; the branch capacity betweenness represents the ratio of the sum of the power weighted transmission capacities of the paths between the power generation-load node pairs passing through the branch e in the power grid to the sum of the power weighted transmission capacities of the power transmission paths between all the power generation-load node pairs in the power grid.
S13: establishing a survivability evaluation sub-index model of the planning scheme based on the key nodes and the key branches of the planning scheme, and obtaining the result of the survivability evaluation sub-index model of the planning scheme through calculation;
in the specific implementation process of the invention, the survivability evaluation sub-index model of the planning scheme comprises a power grid connectivity index model, a key node distance index model, a key branch distance index model, an intermittent energy distance index model and an intermittent energy dependency index model.
Specifically, the calculation formula of the power grid connectivity index model is as follows:
wherein, C g Is the index of the connectivity of the power grid, N is the number of nodes of the power grid, V is the set of nodes of the power grid, k ij Is node pair v i 、v j The connectivity of the node pair refers to the minimum number of branches to be removed for disconnecting the node pair in the power grid;
the calculation formula of the key node distance index model is as follows:
wherein, A bus Is a key node distance index, N bus Is the number of key nodes, n i 、n j Is a key node, the key node is a node in the power grid which bears important electric energy transmission tasks, S is a key node set, D ij Is a key node n i 、n j The spatial distance between the nodes refers to the minimum number of branches for communicating 2 nodes;
the calculation formula of the key branch distance index model is as follows:
wherein A is branch Is a key branch distance index, N branch The key branch number is the branch which bears the important electric energy transmission task in the power grid, b e 、b f Is a critical branch, T is a set of critical branches, D ef Is a critical branch b e 、b f The spatial distance between the branches refers to the minimum number of nodes for communicating 2 branches;
the calculation formula of the intermittent energy distance index model is as follows:
wherein D is ie As an intermittent energy distance index, N ie The number of the intermittent energy sources accessed in the power grid, i is the intermittent energy source, w i The ratio of the rated capacity of the intermittent energy source i to the total capacity of the intermittent energy source d avr,i The space distance is an average value of the space distance between an access point of the intermittent energy source i and a key node in the power grid, and if the access point is the key node, the space distance is 0;
the calculation formula of the intermittent energy dependence index model is as follows:
wherein R is ie As an indicator of intermittent energy dependence, n load For load nodes with power derived from intermittent energy sources i with a proportion greater than a threshold value kAnd (4) counting.
S14: performing per unit processing on the result of the survivability evaluation sub-index model of the planning scheme, and calculating a survivability comprehensive index of the planning scheme according to a weight coefficient;
in a specific implementation process of the present invention, the performing per-unit processing on the result of the survivability evaluation sub-index model of the planning scheme, and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient includes: performing per-unit processing on the result of the survivability evaluation sub-index model of the planning scheme, wherein the reference value of each index is the maximum value of the index in the calculation result of the planning scheme; determining a weight coefficient of the reference value of each index based on a hierarchical analysis algorithm; and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient of the standard value of each index.
Specifically, the calculation formula of the survivability comprehensive index of the planning scheme is as follows:
wherein S is a survivability comprehensive index of the planning scheme, and alpha 1 、α 2 、α 3 、α 4 、α 5 Decibels are weight coefficients of reference values of the connectivity, the distance degree of the key node, the distance degree of the key branch, the distance degree of the intermittent energy source and the index of the intermittent energy source dependency,
the key node distance degree, the key branch distance degree, the intermittent energy distance degree and the intermittent energy dependency degree are the per unit values of the index.
S15: and evaluating the quality condition of the planning scheme with the intermittent energy accessed to the power grid based on the survivability comprehensive index of the planning scheme.
Specifically, the planning scheme is evaluated based on a survivability comprehensive index S of the planning scheme, and the greater the S is, the better the survivability of the planning scheme with the intermittent energy accessed to the power grid is.
In the implementation of the invention, the power grid survivability evaluation method considering the intermittent energy establishes a power grid survivability evaluation model, comprehensively considers the structure and the operation characteristics of the power grid and the influence of the access of the intermittent energy, evaluates the survivability of a power grid planning scheme from multiple aspects of the power grid communication degree, the distribution of key nodes, key branches and the intermittent energy and the dependence degree of load on the intermittent energy, and provides a beneficial reference for power grid planning.
Those skilled in the art will appreciate that all or part of the steps in the methods of the above embodiments may be implemented by hardware related to instructions of a program, and the program may be stored in a computer-readable storage medium, and the storage medium may include: a Read Only Memory (ROM), a Random Access Memory (RAM), a magnetic or optical disk, and the like.
In addition, the above detailed description is given to the method for assessing survivability of a power grid considering intermittent energy provided by the embodiment of the present invention, and a specific example should be adopted herein to explain the principle and the implementation manner of the present invention, and the description of the above embodiment is only used to help understanding the method of the present invention and the core idea thereof; meanwhile, for a person skilled in the art, according to the idea of the present invention, there may be variations in the specific embodiments and the application scope, and in summary, the content of the present specification should not be construed as a limitation to the present invention.
Claims (4)
1. A method for assessing survivability of an electrical grid in view of intermittent energy sources, the method comprising:
analyzing a power flow path in a planning scheme with intermittent energy accessed into a power grid to obtain the power proportion supplied by each power supply point to each load point;
screening out key nodes and key branches of the planning scheme based on the power proportion supplied by each power supply point to each load point and the running state of the power grid;
establishing a survivability evaluation sub-index model of the planning scheme based on the key nodes and the key branches of the planning scheme, and obtaining the result of the survivability evaluation sub-index model of the planning scheme through calculation; the survivability evaluation sub-index model of the planning scheme comprises a power grid connectivity index model, a key node distance index model, a key branch distance index model, an intermittent energy distance index model and an intermittent energy dependency index model;
the calculation formula of the power grid connectivity index model is as follows:
the calculation formula of the key node distance degree index model is as follows:
the calculation formula of the key branch distance index model is as follows:
the calculation formula of the intermittent energy distance index model is as follows:
the calculation formula of the intermittent energy dependence index model is as follows:
wherein, C g Is the index of the connectivity of the power grid,n is the number of nodes in the power grid, V is the set of nodes in the power grid, k ij For node pair v i 、v j Connectivity in the grid; a. the bus As a key node distance index, N bus Is the number of key nodes, n i 、n j Is a key node, S is a set of key nodes, D ij Is a key node n i 、n j The spatial distance therebetween; a. the branch As a key branch distance index, N branch Is the key number of branches, b e 、b f Is a critical branch, T is a set of critical branches, D ef Is a critical branch b e 、b f The spatial distance therebetween; d ie As an indicator of distance to intermittent energy source, N ie The number of the intermittent energy sources accessed in the power grid, i is the intermittent energy source, w i The ratio of the rated capacity of the intermittent energy source i to the total capacity of the intermittent energy source d avr,i The average value of the space distance between the access point of the intermittent energy source i and the key node in the power grid is obtained; r is ie As an intermittent energy dependence index, n load The load node number of which the proportion of the power from the intermittent energy source i is greater than a threshold value k is determined;
performing per-unit processing on the result of the survivability evaluation sub-index model of the planning scheme, and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient;
evaluating the quality condition of the planning scheme with the intermittent energy accessed to the power grid based on the survivability comprehensive index of the planning scheme; and evaluating the planning scheme based on the survivability comprehensive index of the planning scheme, wherein the larger the survivability comprehensive index is, the better the survivability of the planning scheme with the intermittent energy accessed into the power grid is.
2. The method as claimed in claim 1, wherein the step of performing a tidal current path analysis in the planning scheme for accessing the intermittent energy into the power grid to obtain the power ratio supplied by each power source point to each load point comprises:
forming a power generation-load node pair set in a planning scheme with intermittent energy accessed into a power grid;
searching a power flow transmission path between any node pair in the power generation-load node pair set based on power flow distribution;
calculating to obtain the transmission power between each node pair based on the load flow transmission path between any node pair in the power generation-load node pair set;
and obtaining the power proportion supplied by each power supply point to each load according to the transmission power between each pair of nodes.
3. The method according to claim 1, wherein the performing per unit processing on the result of the survivability evaluation sub-index model of the planning scheme and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient to obtain the survivability comprehensive index of the planning scheme includes:
performing per-unit processing on the result of the survivability evaluation sub-index model of the planning scheme, wherein the reference value of each index is the maximum value of the index in the calculation result of the planning scheme;
determining a weight coefficient of the reference value of each index based on a hierarchical analysis algorithm;
and calculating the survivability comprehensive index of the planning scheme according to the weight coefficient of the standard value of each index.
4. The method for assessing the survivability of the power grid considering the intermittent energy source as claimed in claim 3, wherein the survivability comprehensive index of the planning scheme is calculated by the following formula:
wherein S is a survivability comprehensive index of the planning scheme, and alpha 1 、α 2 、α 3 、α 4 、α 5 Decibel is connectivity, distance between key nodes, distance between key branches, and intermittence performanceThe weighting coefficients of the reference values of the source distance degree and the intermittent energy source dependency degree index,
the key node distance degree, the key branch distance degree, the intermittent energy distance degree and the intermittent energy dependency degree are the per unit values of the index.
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