CN114117795A - Distribution network reliability evaluation method based on load-power supply connectivity analysis - Google Patents
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Abstract
The invention provides a distribution network reliability evaluation method based on load-power supply connectivity analysis, which relates to the field of power supply reliability evaluation of power systems and comprises the following steps: drawing a distribution network topology structure diagram; enumerating faults of the switch and the line as a single fault scene in the distribution network reliability analysis; analyzing connectivity between each load node and a power supply at the moment of fault occurrence; analyzing the connectivity between each load node and a power supply in the fault isolation process; analyzing connectivity between each load node and a power supply under the condition of the distribution network fault restructuring; the method comprises the steps of generating comprehensive faults, isolating and reconstructing faults of a distribution network, and quantifying the influence of single faults of the distribution network on the power supply reliability of each load node; and (4) integrating the power supply reliability of each load node under the condition of the fault of a single line or a switching element of the distribution network, and calculating to obtain the power supply reliability index of the whole distribution network. The invention adopts the load-power supply connectivity analysis, can intuitively describe the distribution network load power supply reliability and improve the accuracy of the reliability evaluation result.
Description
Technical Field
The invention relates to the technical field of power supply reliability evaluation of power systems, in particular to a distribution network reliability evaluation method based on load-power supply connectivity analysis.
Background
The power supply reliability of the power system is one of the key indexes of the system operation. The distribution network is directly responsible for supplying power to power consumers, the number of the consumers in the system is large, the system is provided with a large number of switching elements and power supply lines, the protection measure level of the elements and the equipment is lower than that of a power generation and transmission system, and the elements make power supply reliability evaluation of the distribution network system necessary. By developing a reliability evaluation algorithm, the influence of distribution network operation adjustment on distribution network internal users and system overall power supply reliability under various element fault conditions and fault conditions of a distribution network is quantified.
For reliability evaluation of the distribution network, a fault enumeration method is generally adopted, possible fault scenes are enumerated, the fault influence range is analyzed, and finally, all the fault scenes are synthesized to calculate the power supply reliability index of a single user load node and the whole distribution network. The defects of the existing distribution network reliability evaluation algorithm are represented in the following two aspects:
(1) when the influence of distribution network element faults on user power supply is analyzed, the whole distribution network response flow of fault occurrence, fault isolation and distribution network fault reconstruction cannot be taken into account, and the user short-time power failure process in the fault isolation and distribution network fault reconstruction process is ignored, so that an optimistic distribution network reliability evaluation result is obtained.
(2) And analyzing the power supply reliability of a specific user under the overall system structure of the distribution network system. Considering the unique radiation structure of the distribution network, the power supply reliability of the user is only affected by elements on the communication path between the user and the power supply nodes of the distribution network.
Disclosure of Invention
The invention aims to realize the integration of the whole processes of fault occurrence, fault isolation and distribution network fault reconstruction corresponding to enumerated fault scenes in the distribution network reliability evaluation, accurately quantize the power supply reliability index of the affected power users and further realize the evaluation of the overall power supply reliability of the system.
In order to achieve the purpose, the invention adopts the following technical scheme:
a distribution network reliability assessment method based on load-power supply connectivity analysis comprises the following steps:
s1: drawing a distribution network topology structure diagram, and determining switch nodes and circuits existing in a path between each load node and a power supply;
s2: enumerating faults of the switch and the line as a single fault scene in the distribution network reliability analysis;
s3: analyzing connectivity between each load node and a power supply at the moment of fault occurrence;
s4: analyzing the connectivity between each load node and a power supply in the fault isolation process;
s5: analyzing connectivity between each load node and a power supply under the condition of the distribution network fault restructuring;
s6: the method comprises the steps of generating comprehensive faults, isolating and reconstructing faults of a distribution network, and quantifying the influence of single faults of the distribution network on the power supply reliability of each load node;
s7: and (4) integrating the power supply reliability of each load node under the condition of the fault of a single line or a switching element of the distribution network, and calculating to obtain the power supply reliability index of the whole distribution network.
Preferably, the distribution network topology structure diagram in S1 is drawn based on a distribution network structure, and the distribution network topology structure diagram includes a power supply, a line, a switch, and a load node.
Preferably, the step in S3 is: for the power distribution network, m load nodes and n single fault scenes exist; for a specific fault scenario j (j belongs to [1,2, …, n ]), the initial values of the connectivity identifiers F1(i, j) between the load nodes i (i belongs to [1,2, …, m ]) and the power supply at the fault occurrence time are all set to be 0; backtracking from the fault element to the distribution network power supply, and positioning the isolating switch closest to the fault point; traversing each load node, if the isolator switch exists in the path between a load node i and the power supply, F1(i, j) is set to "1".
Preferably, the step in S4 is: for a specific fault scene j (j belongs to [1,2, …, n ]), setting the initial value of a connectivity identifier F2(i, j) between a load node i (i belongs to [1,2, …, m ]) and a power supply to be 0; backtracking from the fault element to the distribution network power supply, and positioning the quick-break switch and the isolating switch which are closest to the fault point; traversing each load node, if the disconnecting switch closest to the fault point position of the fault element does not exist in a path between a certain load node i and the power supply, and the quick-break switch closest to the fault point position exists in a path between a certain load node i and the power supply, F2(i, j) is set to "1".
Preferably, the step in S5 is: setting initial values of connectivity identifiers F3(i, j) between the load nodes i (i belongs to [1,2, …, m ]) and the power supply to be 0 under the condition of distribution network fault reconstruction aiming at a specific fault scene j (j belongs to [1,2, …, n ]); backtracking from the fault element to the distribution network power supply, positioning the isolating switch closest to the fault point, and switching the switch to a disconnected state; traversing each load node, if the isolating switch exists in a path between a certain load node i and a power supply and the tail end of a feeder line where the load node i is located has a contact switch, placing the isolating switch closest to the position of the fault point in a disconnected state, placing the contact switch in a connected state, and detecting the connectivity between the load node i and a distribution network power supply under the condition; if the load node i is connectable to the distribution network power supply, F3(i, j) is set to "1".
Preferably, the S6 includes the following steps:
for a particular fault scenario j (j e [1,2, …, n)]) With respect to the failure rate of the element of lambdajElement repair time of Tj(ii) a The method integrates the fault occurrence, fault isolation and distribution network fault reconstruction processes of a fault scene, wherein the fault scene corresponds to a load node i (i belongs to [1,2, …, m ∈ [)]) The quantitative expression of the influence of the power supply failure rate is shown as a formula (1); the quantitative expression of the influence on the power failure time of the load node is shown as a formula (2);
λ(i,j)＝F1(i,j)λj+F2(i,j)λj (1)
T(i,j)＝[F1(i,j)-F3(i,j)]Tj+[F2(i,j)+F3(i,j)]TSW (2)
lambda (i, j) is the power supply failure rate of the load node i caused by the failure scene j, and T (i, j) is the power failure time of the load node i caused by the failure scene j，TSWThe time required by switching operation in the process of distribution network fault isolation and fault reconstruction is provided;
power supply fault rate index lambda of load node i under condition of considering all single faultsiPower off time index TiAnd an electricity shortage indicator ENSiRespectively as follows:
Piis the active power level at the load node i.
Preferably, the S7 includes the following steps:
and integrating the reliability calculation parameters of each load node, and solving the overall reliability index of the distribution network under the condition of single fault, wherein: the calculation expression of the system average power failure frequency index (SAIFI) is as follows:
Nithe number of load users at a load node i is;
the system average outage duration indicator (SAIDI) is calculated by the expression:
the calculation expression of the user average power failure time index (CAIDI) is as follows:
the calculation expression of the average power supply availability index (ASAI) is:
the calculation expression of the insufficient battery indicator (ENS) is:
the average electrical energy deficiency indicator (AENS) is calculated by the expression:
compared with the prior art, the invention has the beneficial effects that:
1. when the power supply reliability of a specific user load is analyzed, related elements influencing the power supply of the user load are extracted by analyzing the communication paths of the user load nodes and the power supply nodes of the distribution network, so that the rapid load-power supply connectivity analysis can be realized, and the operation efficiency of a distribution network reliability analysis algorithm is improved.
2. The method can analyze the whole processes of fault occurrence, fault isolation and distribution network fault reconstruction corresponding to the distribution network element fault, and sets corresponding identifiers to comprehensively consider the power supply stop of the load nodes in the whole fault repair process and the power supply stop of the load nodes only in a short time in the fault isolation process based on the connectivity between the load nodes and the distribution network power supply nodes in each stage process. By introducing the identifier, the calculation of the power supply reliability indexes of the load nodes and the whole distribution network based on fault enumeration is realized.
Drawings
Fig. 1 is a flowchart of a distribution network reliability evaluation method based on load-power connectivity analysis according to an embodiment of the present invention;
fig. 2 is a distribution network topology structure diagram according to an embodiment of the present invention;
fig. 3 is a distribution network topology structure diagram in the fault isolation process according to an embodiment of the present invention;
fig. 4 is a distribution network topology structure diagram in the distribution network fault reconfiguration process according to an embodiment of the present invention.
Detailed Description
In order to make the objects, technical solutions and advantages of the present invention more apparent, the present invention is further described in detail with reference to the following embodiments.
In the following description, numerous specific details are set forth in order to provide a thorough understanding of the present invention, however, the present invention may be practiced in other ways than those specifically described herein, and thus the present invention is not limited to the specific embodiments of the present disclosure.
Referring to fig. 1, a distribution network reliability evaluation method based on load-power connectivity analysis includes the following steps:
s1: drawing a distribution network topology structure diagram, and determining switch nodes and circuits existing in a path between each load node and a power supply;
in an embodiment, the distribution network topology structure diagram is drawn based on a distribution network structure, and the distribution network topology structure diagram includes a power supply, a line, a switch, and a load node.
S2: enumerating faults of the switch and the line as a single fault scene in the distribution network reliability analysis;
s3: analyzing connectivity between each load node and a power supply at the moment of fault occurrence;
in one embodiment, for the power distribution network, there are m load nodes and n single fault scenarios; for a specific fault scenario j (j belongs to [1,2, …, n ]), the initial values of the connectivity identifiers F1(i, j) between the load nodes i (i belongs to [1,2, …, m ]) and the power supply at the fault occurrence time are all set to be 0; backtracking from the fault element to the distribution network power supply, and positioning the isolating switch closest to the fault point; traversing each load node, if the isolator switch exists in the path between a load node i and the power supply, F1(i, j) is set to "1".
Specifically, referring to fig. 2, "L _ i" represents the ith user load node, "SD _ i" represents the ith quick-break switch, "GL _ i" represents the ith isolating switch, "T _ i" represents the ith T-junction, and "LL _ i" represents the ith interconnection switch. When a line between GL _1 and T _14 nodes breaks down, backtracking from a fault element to a distribution network power supply, and positioning an isolating switch GL _1 closest to the position of the fault point; traversing each load node, GL _1 exists in the path between the load node 13-19 and the power supply, setting F1(i, j) (i e [13,14, …,19]) to "1".
S4: analyzing the connectivity between each load node and a power supply in the fault isolation process;
in one embodiment, for a specific fault scenario j (j e [1,2, …, n ]), the initial value of the connectivity identifier F2(i, j) between the load node i (i e [1,2, …, m ]) and the power source during the fault isolation process is set to "0"; backtracking from the fault element to the distribution network power supply, and positioning the quick-break switch and the isolating switch which are closest to the fault point; traversing each load node, if the disconnecting switch closest to the fault point position of the fault element does not exist in a path between a certain load node i and the power supply, and the quick-break switch closest to the fault point position exists in a path between a certain load node i and the power supply, F2(i, j) is set to "1".
Specifically, referring to fig. 3, in the distribution network topology structure of the line fault between GL _1 and T _14 nodes in the fault isolation process in fig. 3, the fast-break switch and the disconnecting switch closest to the fault point position are located as SD _3 and GL _1, respectively, and traversing each load node, the fault element and the disconnecting switch GL _1 closest to the fault point position do not exist in the path between the load node 8-12 and the power supply, and the fast-break switch SD _3 closest to the fault point position exists in the path between the load node 8-12 and the power supply, and setting F2(i, j) (i ∈ [8,9, …,12]) to "1", which indicates that the load node will terminate power supply in a short time during the operation of the fast-break switch SD _3, and can resume power supply after the disconnecting fault of the disconnecting switch GL _ 1.
S5: analyzing connectivity between each load node and a power supply under the condition of the distribution network fault restructuring;
in one embodiment, for a specific fault scenario j (j e [1,2, …, n ]), the initial value of the connectivity identifier F3(i, j) between the load node i (i e [1,2, …, m ]) and the power supply under the distribution network fault reconstruction condition is set to "0"; backtracking from the fault element to the distribution network power supply, positioning the isolating switch closest to the fault point, and switching the switch to a disconnected state; traversing each load node, if the isolating switch exists in a path between a certain load node i and a power supply and the tail end of a feeder line where the load node i is located has a contact switch, placing the isolating switch closest to the position of the fault point in a disconnected state, placing the contact switch in a connected state, and detecting the connectivity between the load node i and a distribution network power supply under the condition; if the load node i is connectable to the distribution network power supply, F3(i, j) is set to "1".
Specifically, referring to fig. 4, in the distribution network topology structure of the line fault between GL _1 and T _14 nodes in the distribution network fault reconfiguration process, tracing back from the fault element to the distribution network power supply, positioning the isolating switch GL _1 closest to the fault point, and turning off the switch; traversing each load node, wherein the isolating switch exists in a path between the load node 13-19 and a power supply, a connection switch LL _1 exists at the tail end of a feeder line where the load node 13-19 is located, the isolating switch GL _2 closest to the position of the isolated fault point is placed in an off state, the connection switch LL _1 is placed in an on state, under the condition, the load node 15-19 can be connected with a distribution network power supply again, and then F3(i, j) (i belongs to [15,16, …,19]) is set to be '1', which indicates that the load node can restore power supply after the distribution network fault is reconstructed.
S6: the method comprises the steps of generating comprehensive faults, isolating and reconstructing faults of a distribution network, and quantifying the influence of single faults of the distribution network on the power supply reliability of each load node;
in one embodiment, for a particular failure scenario j (j e [1,2, …, n)]) With respect to the failure rate of the element of lambdajElement repair time of Tj(ii) a The method synthesizes the fault generation, fault isolation and distribution network fault reconstruction processes of a fault scene, wherein the fault scene is applied to a load node i (i belongs to the E)[1,2,…,m]) The quantitative expression of the influence of the power supply failure rate is shown as a formula (1); the quantitative expression of the influence on the power failure time of the load node is shown as a formula (2);
λ(i,j)＝F1(i,j)λj+F2(i,j)λj (1)
T(i,j)＝[F1(i,j)-F3(i,j)]Tj+[F2(i,j)+F3(i,j)]TSW (2)
lambda (i, j) is the power supply failure rate of the load node i caused by the failure scene j, T (i, j) is the power failure time of the load node i caused by the failure scene j, and TSWThe time required by switching operation in the process of distribution network fault isolation and fault reconstruction is provided;
power supply fault rate index lambda of load node i under condition of considering all single faultsiPower off time index TiAnd an electricity shortage indicator ENSiRespectively as follows:
in the above formula, PiIs the active power level at the load node i.
S7: and (4) integrating the power supply reliability of each load node under the condition of the fault of a single line or a switching element of the distribution network, and calculating to obtain the power supply reliability index of the whole distribution network.
Specifically, the reliability calculation parameters of each load node are integrated, and the overall reliability index of the distribution network under the condition of single fault is solved, wherein: the calculation expression of the system average power failure frequency index (SAIFI) is as follows:
Nithe number of load users at a load node i is;
the system average outage duration indicator (SAIDI) is calculated by the expression:
the calculation expression of the user average power failure time index (CAIDI) is as follows:
the calculation expression of the average power supply availability index (ASAI) is:
the calculation expression of the insufficient battery indicator (ENS) is:
the average electrical energy deficiency indicator (AENS) is calculated by the expression:
according to the distribution network reliability evaluation method based on the load-power supply connectivity analysis, when the power supply reliability of a specific user load is analyzed, relevant elements influencing the power supply of the user load are extracted by analyzing the communication paths of the user load nodes and the distribution network power supply nodes in a distribution network, so that the rapid load-power supply connectivity analysis can be realized, and the operation efficiency of a distribution network reliability analysis algorithm is improved.
The assessment method can analyze the whole processes of fault occurrence, fault isolation and distribution network fault reconstruction corresponding to the distribution network element fault, and based on the connectivity between the load nodes and the distribution network power supply nodes in each stage process, the corresponding identifiers are set to comprehensively consider the power supply stop of the load nodes in the whole fault repair process and the power supply stop of the load nodes in the fault isolation process, and by introducing the identifiers, the calculation of the power supply reliability indexes of the load nodes and the distribution network whole based on fault enumeration is realized.
The above description is only an example of the present invention, and is not intended to limit the present invention, and it is obvious to those skilled in the art that various modifications and variations can be made in the present invention. Any modification, equivalent replacement, or improvement made within the spirit and principle of the present invention should be included in the scope of the claims of the present invention.
Claims (7)
1. A distribution network reliability assessment method based on load-power supply connectivity analysis is characterized in that: comprises the following steps:
s1: drawing a distribution network topology structure diagram, and determining switch nodes and circuits existing in a path between each load node and a power supply;
s2: enumerating faults of the switch and the line as a single fault scene in the distribution network reliability analysis;
s3: analyzing connectivity between each load node and a power supply at the moment of fault occurrence;
s4: analyzing the connectivity between each load node and a power supply in the fault isolation process;
s5: analyzing connectivity between each load node and a power supply under the condition of the distribution network fault restructuring;
s6: the method comprises the steps of generating comprehensive faults, isolating and reconstructing faults of a distribution network, and quantifying the influence of single faults of the distribution network on the power supply reliability of each load node;
s7: and (4) integrating the power supply reliability of each load node under the condition of the fault of a single line or a switching element of the distribution network, and calculating to obtain the power supply reliability index of the whole distribution network.
2. The distribution network reliability evaluation method based on the load-power connectivity analysis, according to claim 1, characterized in that: the distribution network topology structure diagram in S1 is drawn based on a distribution network structure, and the distribution network topology structure diagram includes a power supply, a line, a switch, and a load node.
3. The distribution network reliability evaluation method based on the load-power connectivity analysis, according to claim 1, characterized in that: the step in S3 is: for the power distribution network, m load nodes and n single fault scenes exist; for a specific fault scenario j (j belongs to [1,2, …, n ]), the initial values of the connectivity identifiers F1(i, j) between the load nodes i (i belongs to [1,2, …, m ]) and the power supply at the fault occurrence time are all set to be 0; backtracking from the fault element to the distribution network power supply, and positioning the isolating switch closest to the fault point; traversing each load node, if the isolator switch exists in the path between a load node i and the power supply, F1(i, j) is set to "1".
4. The distribution network reliability evaluation method based on the load-power connectivity analysis, according to claim 1, characterized in that: the step in S4 is: for a specific fault scene j (j belongs to [1,2, …, n ]), setting the initial value of a connectivity identifier F2(i, j) between a load node i (i belongs to [1,2, …, m ]) and a power supply to be 0; backtracking from the fault element to the distribution network power supply, and positioning the quick-break switch and the isolating switch which are closest to the fault point; traversing each load node, if the disconnecting switch closest to the fault point position of the fault element does not exist in a path between a certain load node i and the power supply, and the quick-break switch closest to the fault point position exists in a path between a certain load node i and the power supply, F2(i, j) is set to "1".
5. The distribution network reliability evaluation method based on the load-power connectivity analysis, according to claim 1, characterized in that: the step in S5 is: setting initial values of connectivity identifiers F3(i, j) between the load nodes i (i belongs to [1,2, …, m ]) and the power supply to be 0 under the condition of distribution network fault reconstruction aiming at a specific fault scene j (j belongs to [1,2, …, n ]); backtracking from the fault element to the distribution network power supply, positioning the isolating switch closest to the fault point, and switching the switch to a disconnected state; traversing each load node, if the isolating switch exists in a path between a certain load node i and a power supply and the tail end of a feeder line where the load node i is located has a contact switch, placing the isolating switch closest to the position of the fault point in a disconnected state, placing the contact switch in a connected state, and detecting the connectivity between the load node i and a distribution network power supply under the condition; if the load node i is connectable to the distribution network power supply, F3(i, j) is set to "1".
6. The distribution network reliability evaluation method based on the load-power connectivity analysis, according to claim 1, characterized in that: the S6 includes the following steps:
for a particular fault scenario j (j e [1,2, …, n)]) With respect to the failure rate of the element of lambdajElement repair time of Tj(ii) a The method integrates the fault occurrence, fault isolation and distribution network fault reconstruction processes of a fault scene, wherein the fault scene corresponds to a load node i (i belongs to [1,2, …, m ∈ [)]) The quantitative expression of the influence of the power supply failure rate is shown as a formula (1); the quantitative expression of the influence on the power failure time of the load node is shown as a formula (2);
λ(i,j)＝F1(i,j)λj+F2(i,j)λj (1)
T(i,j)＝[F1(i,j)-F3(i,j)]Tj+[F2(i,j)+F3(i,j)]TSW (2)
lambda (i, j) is the power supply failure rate of the load node i caused by the failure scene j, T (i, j) is the power failure time of the load node i caused by the failure scene j, and TSWThe time required by switching operation in the process of distribution network fault isolation and fault reconstruction is provided;
power supply fault rate index lambda of load node i under condition of considering all single faultsiPower off time index TiAnd an electricity shortage indicator ENSiRespectively as follows:
Piis the active power level at the load node i.
7. The distribution network reliability evaluation method based on the load-power connectivity analysis, according to claim 1, characterized in that: the S7 includes the following steps:
and integrating the reliability calculation parameters of each load node, and solving the overall reliability index of the distribution network under the condition of single fault, wherein: the calculation expression of the system average power failure frequency index (SAIFI) is as follows:
Nithe number of load users at a load node i is;
the system average outage duration indicator (SAIDI) is calculated by the expression:
the calculation expression of the user average power failure time index (CAIDI) is as follows:
the calculation expression of the average power supply availability index (ASAI) is:
the calculation expression of the insufficient battery indicator (ENS) is:
the average electrical energy deficiency indicator (AENS) is calculated by the expression:
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