CN110021936B - Method and device for determining running state of ring-containing power distribution network - Google Patents
Method and device for determining running state of ring-containing power distribution network Download PDFInfo
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Abstract
The embodiment of the invention provides a method and a device for determining the running state of a ring-containing power distribution network, wherein after basic parameters and a topological structure of the ring-containing power distribution network are obtained, firstly, connecting branches of the ring-containing power distribution network are determined according to the topological structure; then, constructing a virtual splitting node at the connecting branch; secondly, acquiring the voltage of each node in the ring-containing power distribution network containing the virtual split node based on basic parameters by adopting a forward-backward substitution mode; and finally, determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network. Therefore, the virtual split nodes are constructed at the branches of the distribution network containing the rings, so that the annular loops in the distribution network containing the rings disappear, and further a forward-backward substitution method can be adopted to obtain the voltage of each node in the distribution network containing the rings, the efficiency of determining the running state of the distribution network containing the rings can be improved, and the distribution network containing the rings can be timely and effectively maintained when abnormality occurs.
Description
Technical Field
The invention relates to the technical field of power system analysis, in particular to a method and a device for determining the running state of a distribution network with a ring.
Background
With the continuous development of science and technology, people need to use electricity at any time and any place in daily life, and the electricity is mainly provided by an electric power system. In order to ensure normal electricity utilization of people, the operation state of a power system needs to be monitored, namely the operation state of a power distribution network is determined. When the abnormal operation of the power distribution network is determined, the power distribution network needs to be adjusted, and the normal operation of the power distribution network is recovered, so that normal power utilization of people is guaranteed.
In practical applications, the distribution network includes a distribution network including rings, and the distribution network including rings includes a ring loop, and the existence of the ring loop may increase the difficulty of determining the operation state of the distribution network including rings. At present, in order to determine the operation state of the distribution network with loops, the load flow calculation is mainly performed on the distribution network with loops by adopting an improved newton method, an implicit Zbus gaussian method, a loop impedance method and the like, and then the operation state of the distribution network with loops is determined according to the load flow calculation result.
However, the improved newton method, the implicit Zbus gaussian method and the loop impedance method are high in complexity, time is consumed when load flow calculation is performed on the distribution network with the ring, and therefore the efficiency of determining the operation state of the distribution network with the ring is reduced.
Disclosure of Invention
In view of the foregoing problems, an object of the embodiments of the present invention is to provide a method and an apparatus for determining an operating state of a distribution network including a ring, which can improve efficiency of determining the operating state of the distribution network including the ring.
In a first aspect, an embodiment of the present invention provides a method for determining an operating state of a distribution network including a ring, where the method includes: obtaining basic parameters and a topological structure of a ring-containing power distribution network, wherein the basic parameters comprise: the head node, the tail node, the branch load and the position of the interconnection switch; determining connecting branches of the ring-containing power distribution network according to the topological structure, wherein the connecting branches and partial branches in the ring-containing power distribution network form a ring loop; constructing a virtual splitting node at the connecting branch, wherein the virtual splitting node divides the connecting branch into two branches; acquiring the voltage of each node in the ring-containing power distribution network containing the virtual split node based on the basic parameters in a forward-backward substitution mode; and determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network.
In a second aspect, an embodiment of the present invention provides an apparatus for determining an operating state of a distribution network including a ring, where the apparatus includes: the receiving module is configured to acquire basic parameters and a topological structure of the ring-containing power distribution network, wherein the basic parameters comprise: the head node, the tail node, the branch load and the position of the interconnection switch; a first determining module configured to determine a branch of the distribution network containing rings according to the topological structure, wherein the branch and a part of branches in the distribution network containing rings form a ring loop; a dividing module configured to construct a virtual splitting node at the connecting branch, the virtual splitting node dividing the connecting branch into two branches; the calculation module is configured to acquire voltages of nodes in the ring-containing power distribution network based on the basic parameters and in a forward-backward substitution mode in the ring-containing power distribution network including the virtual split node; the second determining module is configured to determine the operation state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network.
In a third aspect, an embodiment of the present invention provides an electronic device, where the electronic device includes: at least one processor; and at least one memory, bus connected with the processor; the processor and the memory complete mutual communication through the bus; the processor is configured to call the program instructions in the memory to perform the method according to one or more of the above-mentioned embodiments.
In a fourth aspect, an embodiment of the present invention provides a computer-readable storage medium, where the storage medium includes a stored program, and when the program runs, a device in which the storage medium is located is controlled to perform a method in one or more of the above technical solutions.
After obtaining basic parameters and a topological structure of the ring-containing power distribution network, firstly, determining a connecting branch of the ring-containing power distribution network according to the topological structure; then, constructing a virtual splitting node at the connecting branch; secondly, acquiring the voltage of each node in the ring-containing power distribution network containing the virtual split node based on basic parameters by adopting a forward-backward substitution mode; and finally, determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network. Therefore, the virtual split node is constructed at the connecting branch of the power distribution network containing the ring, so that the ring loop in the power distribution network containing the ring disappears, and the voltage of each node in the power distribution network containing the ring can be obtained by adopting a forward-backward substitution method. The forward-backward substitution method is simple and high in calculation speed, so that the time for carrying out load flow calculation on the distribution network containing the ring can be saved, the efficiency for determining the running state of the distribution network containing the ring can be further improved, and the distribution network containing the ring can be timely and effectively maintained when abnormality occurs.
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Various other advantages and benefits will become apparent to those of ordinary skill in the art upon reading the following detailed description of the preferred embodiments. The drawings are only for purposes of illustrating the preferred embodiments and are not to be construed as limiting the invention. Also, like reference numerals are used to refer to like parts throughout the drawings. In the drawings:
fig. 1 is a first schematic flow chart of a method for determining an operating state of a distribution network including a ring in an embodiment of the present invention;
FIG. 2 is a schematic view of a branch and a connective branch according to an embodiment of the present invention;
FIG. 3 is a diagram illustrating a virtual split node according to an embodiment of the invention;
fig. 4 is a schematic flow chart of a method for determining an operating state of a distribution network including a ring in an embodiment of the present invention;
FIG. 5 is a schematic diagram of a first virtual split node and a second virtual split node in an embodiment of the invention;
FIG. 6 is a block diagram of an IEEE33 node power distribution system in an embodiment of the invention;
FIG. 7 is a schematic diagram of branches and twigs of an IEEE33 node power distribution system in an embodiment of the present invention;
fig. 8 is a comparison graph of voltages of nodes obtained in a radiation distribution network and a ring-containing distribution network respectively under an IEEE33 node distribution system by using a determination method of an operation state of the ring-containing distribution network in the embodiment of the present invention;
fig. 9 is a graph comparing the number of iterations for obtaining the voltage of each node in the IEEE33 node power distribution system by using the method for determining the operating state of the distribution network including the ring and the conventional push-back method in the embodiment of the present invention;
fig. 10 is a schematic structural diagram of an apparatus for determining an operating state of a distribution network including a ring in an embodiment of the present invention;
fig. 11 is a schematic structural diagram of an electronic device in an embodiment of the present invention.
Detailed Description
Exemplary embodiments of the present invention will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the invention are shown in the drawings, it should be understood that the invention can be embodied in various forms and should not be limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the invention to those skilled in the art.
The embodiment of the invention provides a method for determining the operating state of a ring-containing power distribution network, which is applied to determining the operating state of the ring-containing power distribution network. The ring-containing power distribution network may mean that a ring-shaped loop exists in the power distribution network. Because there is the annular loop in the distribution network that contains the ring, can increase the degree of difficulty of the running state of confirming the distribution network, reduce the efficiency of confirming the running state that contains the ring distribution network promptly, and then reduce the efficiency of carrying out earlier stage design and later maintenance to whole electric power system. By the method for determining the running state of the distribution network containing the ring, the efficiency of determining the running state of the distribution network containing the ring can be improved.
The following describes in detail a method for determining an operating state of a distribution network including a ring, which is provided by an embodiment of the present invention. Fig. 1 is a first schematic flow chart of a method for determining an operating state of a distribution network including a ring in an embodiment of the present invention, and as shown in fig. 1, the method may include:
s101: and acquiring basic parameters and a topological structure of the ring-containing power distribution network.
The basic parameters of the distribution network with rings may refer to parameters of each transmission line in the distribution network with rings, and specifically may include: head node, tail node, branch load and tie switch position. After the first node and the tail node in the ring-containing power distribution network are determined, the load of the branch between the first node and the tail node can be determined, and in a specific implementation process, the load of the branch between the first node and the tail node can be the admittance of the branch between the first node and the tail node. And the interconnection switch can realize the switching between the loads, and when the power supply of some loads breaks down, the loads can be transferred to another power supply, so that another power supply can continuously supply power to the loads, and the reliability of the power distribution network is further ensured.
The topological structure of the distribution network with the ring can refer to the connection relation of each node and the branch between each node in the distribution network with the ring, and can truly reflect the actual connection relation of each node and the branch between each node in the distribution network with the ring.
S102: and determining the branches of the power distribution network with the ring according to the topological structure.
After the topological structure of the ring-containing power distribution network is obtained, the actual connection relation of each node in the ring-containing power distribution network and the branches between the nodes can be known, and then the branches and the branches in the ring-containing power distribution network can be determined.
Specifically, according to the topological structure of the distribution network with the ring, the distribution network with the ring is layered from the root node, the branches between the nodes of different layers are used as branches, and the branches between other related nodes are used as branches, so that the branches in the distribution network with the ring can be determined. Here, the branches and a part of branches in the distribution network containing rings form a ring loop in the distribution network containing rings.
For example, fig. 2 is a schematic diagram of branches and branches in an embodiment of the present invention, where circles represent nodes in a power distribution network with rings, lines between the circles represent branches or branches, and dotted lines represent dividing lines between layers. Referring to fig. 2, starting from a root node 1, a distribution network including a ring is divided into 4 layers, where the 1 st layer has the root node 1, the 2 nd layer has nodes 2, 5, and 7, the 3 rd layer has nodes 3 and 6, and the 4 th layer has the node 4. The branches between the nodes 1 and 2, the nodes 2 and 3, the nodes 3 and 4, the nodes 1 and 5, the nodes 5 and 6, and the nodes 1 and 7 are branches, and the branches between the nodes 5 and 7 are branches, so that a circular loop is formed among the nodes 1, 5 and 7.
S103: and constructing a virtual splitting node at the connecting branch.
The virtual split node is not a node actually existing in the ring-containing power distribution network, but a virtual split node is constructed to divide a chain into two branches, so that a ring loop in the ring-containing power distribution network is "disappeared" and the voltage of each node in the ring-containing power distribution network can be calculated in a forward-backward generation mode.
Exemplarily, fig. 3 is a schematic diagram of a virtual splitting node in the embodiment of the present invention, and referring to fig. 3, a virtual splitting node 301 divides a branch between a node 5 and a node 7 into two branches, which form a branch formed by the node 1, the node 5 and the virtual splitting node 301 and a branch formed by the node 1, the node 7 and the virtual splitting node 301, respectively, as a whole.
The virtual splitting node is constructed at the connecting branch, so that the connecting branch can be divided into two branches, the annular loop in the ring-containing power distribution network is enabled to disappear, namely the annular loop does not exist in the ring-containing power distribution network, the voltage of each node in the ring-containing power distribution network can be efficiently obtained by adopting a forward-pushing-back generation mode, and the running state of the ring-containing power distribution network can be efficiently determined.
S104: in a ring-containing power distribution network comprising virtual split nodes, based on basic parameters, the voltage of each node in the ring-containing power distribution network is obtained by adopting a forward-backward substitution mode.
The forward-backward generation is that the starting voltage and the end load of the known distribution network containing the ring are calculated by taking the feeder line as a basic calculation unit. Firstly, assuming that the voltage of the whole network is rated voltage, calculating section by section from the tail end to the initial end according to the load power, only calculating the power loss in each node without calculating the voltage of the node, solving the current and the power loss on each branch circuit, and obtaining the power of the initial end according to the current and the power loss, which is a back-substitution process; and calculating voltage drop section by section from the starting end to the tail end according to the given starting end voltage and the calculated starting end power to obtain the voltage of each node, which is a forward process. The above process is repeated until the power deviation of each node satisfies the allowable condition.
Although the forward-backward substitution mode is the simplest and most rapid mode for acquiring the voltage of each node in the power distribution network at present, due to the characteristics of the forward-backward substitution mode, the forward-backward substitution mode cannot be applied to the calculation of the voltage of each node in the ring-containing power distribution network. And the virtual split node is constructed at the branch, so that the ring loop in the ring-containing power distribution network is considered to be 'disappeared', and the voltage of each node in the ring-containing power distribution network can be efficiently calculated by adopting a forward-backward substitution mode based on the basic parameters in the ring-containing power distribution network.
S105: and determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network.
Due to the adoption of the forward-backward substitution mode, the voltage of each node in the ring-containing power distribution network can be efficiently calculated, the running state of the ring-containing power distribution network can be efficiently determined according to the voltage of each node in the ring-containing power distribution network, and the efficiency of determining the running state of the ring-containing power distribution network can be improved. The operation state of the distribution network containing the ring can be determined by the existing mode according to the voltage of each node in the distribution network containing the ring, so that the detailed description is omitted.
As can be seen from the above, in the method for determining the operation state of the ring-containing power distribution network provided by the embodiment of the present invention, after the basic parameters and the topological structure of the ring-containing power distribution network are obtained, the branches of the ring-containing power distribution network are determined according to the topological structure; then, constructing a virtual splitting node at the connecting branch; secondly, acquiring the voltage of each node in the ring-containing power distribution network containing the virtual split node based on basic parameters by adopting a forward-backward substitution mode; and finally, determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network. Therefore, the virtual split node is constructed at the connecting branch of the power distribution network containing the ring, so that the ring loop in the power distribution network containing the ring disappears, and the voltage of each node in the power distribution network containing the ring can be obtained by adopting a forward-backward substitution method. The forward-backward substitution method is simple and high in calculation speed, so that the time for carrying out load flow calculation on the distribution network containing the ring can be saved, the efficiency for determining the running state of the distribution network containing the ring can be further improved, and the distribution network containing the ring can be timely and effectively maintained when abnormality occurs.
Further, as a refinement and extension of the method shown in fig. 1, an embodiment of the present invention further provides a method for determining an operating state of a distribution network including a ring. Fig. 4 is a schematic flowchart of a second method for determining an operating state of a distribution network including a ring in an embodiment of the present invention, and referring to fig. 4, the method may include:
s401: and acquiring basic parameters and a topological structure of the ring-containing power distribution network.
In step S101, the basic parameters and the topology structure of the distribution network including the ring have been described in detail, and therefore are not described herein again.
S402: and determining a root node of the ring-containing power distribution network according to the topological structure.
That is to say, the node corresponding to the starting end of the ring-containing power distribution network can be determined according to the topological structure of the ring-containing power distribution network. Since the existing method is adopted for determining the root node according to the topology structure, the details are not described herein.
S403: and from the root node, adopting breadth-first search to layer all nodes in the ring-containing power distribution network.
The Breadth-First Search is also called Breadth-First Search, is called breath First Search in all English, and is called BFS in short, belongs to a blind Search method, and aims to systematically expand and check all nodes in a distribution network containing rings.
By adopting breadth-first search, all nodes in the ring-containing power distribution network can be found from the root node of the ring-containing power distribution network, so that any node is prevented from being omitted in the search process, and accurate layering of all nodes in the ring-containing power distribution network is guaranteed.
S404: and taking branches between the nodes associated with the same layer as branches of the power distribution network with the ring.
Because a branch exists between nodes associated with the same layer, and the branch and other part of branches in the distribution network with the ring can form a ring loop in the distribution network with the ring, and the existence of the ring loop can prevent the voltage of each node in the distribution network with the ring from being obtained by adopting a forward-backward substitution mode, a necessary branch forming the ring loop needs to be found out, and the branch is a branch between nodes associated with the same layer, namely a connecting branch.
S405: and constructing a virtual splitting node at the connecting branch.
Here, the virtual split node may include: the first virtual split node and the second virtual split node have opposite directions of equivalent injected currents.
Specifically, two virtual classification nodes are constructed at the same position of the chain, and the two virtual division nodes are a first virtual division node and a second virtual division node. Fig. 5 is a schematic diagram of a first virtual splitting node and a second virtual splitting node in the embodiment of the present invention, and referring to fig. 5, a first virtual splitting node 502 and a second virtual splitting node 503 are constructed on a branch 501, a part of the branch 501 and the first virtual splitting node 502 form a branch, and another part of the branch 501 and the second virtual splitting node 503 form another branch. The current at the first virtual splitting node 502 can be regarded as the current of the node injection current flowing out of the first virtual splitting node 502 through the branch 501, the current at the second virtual splitting node 503 can be regarded as the current of the node injection current flowing into the branch 501 from the second virtual splitting node 503, and the node injection current is the current actually flowing into the ring loop where the branch is located in the power distribution network with the ring, namely the equivalent injection current IbrkThis is the result of dividing the voltage in the loop by the resistance in the loop.
S406: at the virtual split node, a first branch current generated by a power source of the ring-containing power distribution network is determined, and a second branch current of a ring loop in which the virtual split node is located is determined.
That is to say, the node injection current of the annular loop where the virtual classification node is located is decomposed into a first branch current and a second branch current, so that the first branch current and the second branch current are separately subjected to load flow calculation, extra errors generated by the first branch current and the second branch current in a subsequent iteration process are avoided, and the accuracy of the obtained voltage of each node in the distribution network with the ring is improved.
The first branch current and the second branch current are explained in detail below.
The first step is as follows: and determining branches of the ring-containing power distribution network according to the topological structure.
The branches are branches between associated nodes of different levels in the ring-containing power distribution network.
The second step is that: and determining a road matrix, a basic loop matrix and a loop impedance matrix of the distribution network based on the branches, the branches and the basic parameters.
Here, the road matrix, the basic loop matrix, and the loop impedance matrix are all basic matrices in a loop analysis method, the road matrix is used to determine whether two nodes in the distribution network including the loop are in the same direction of the loop, the basic loop matrix is a matrix describing the association relationship between each loop and a branch in the distribution network including the loop, and the loop impedance matrix is a matrix determined by the loop matrix and the branch impedance matrix.
The third step: and determining the first branch current according to the road matrix and the power supply parameters of the power distribution network with the ring.
Specifically, the first branch current is a current generated by a power supply including a ring distribution network, and can be obtained by formula (1):
f1＝TTg formula (1)
Wherein f is1Is the first branch current, g is the node injection current generated by the power supply including the ring distribution network, TTIs a transposed matrix of a road matrix containing a ring distribution network.
The fourth step: and determining the current of the second branch according to the basic loop matrix, the loop impedance matrix and the loop voltage of the power distribution network with the ring.
Specifically, the second branch current is a current of a loop circuit where the virtual splitting node is located, and can be obtained by the formula (2):
wherein f is2Is the second branch current, VLFor loop voltage of power distribution networks containing loops, BTAs a transposed matrix of the basic loop matrix of the power distribution network containing loops, ZLIs a loop impedance matrix of the ring-containing distribution network.
Here, it should be noted that: the determination of the first branch current in the third step and the determination of the second branch current in the fourth step do not have a fixed order in the execution order, and may be executed successively or simultaneously.
At this point, the node injection current of the loop circuit where the virtual classification node is located is decomposed into a first branch current and a second branch current.
S407: and compensating the first branch current by using the second branch current to generate the equivalent injection current of the branch in which the virtual splitting node is positioned.
Specifically, the equivalent injection current can be obtained by the formula (3):
fb＝f1+f2formula (3)
Wherein f isbFor equivalent injection current, f1Is the first branch current, f2Is the second branch current.
S408: in a ring-containing power distribution network comprising virtual split nodes, based on basic parameters and equivalent injection current, the voltage of each node in the ring-containing power distribution network is obtained by adopting a forward-backward substitution mode.
In the specific implementation process, the method can comprise the following steps:
the method comprises the following steps: in a ring-containing power distribution network comprising virtual split nodes, based on basic parameters and equivalent injection current, the voltage of each layer of nodes of the ring-containing power distribution network is sequentially calculated from an upper layer node to a lower layer node of the ring-containing power distribution network.
Before the step one is executed, the voltage of each feeder line in the ring-containing power distribution network needs to be initialized by using the voltage of the root node of the ring-containing power distribution network, wherein the feeder line can refer to a branch in the ring-containing power distribution network, and the voltage of the root node can be obtained from basic parameters. The voltage of each feeder line is determined according to the voltage of the root node by adopting the existing technical means, so that the details are not repeated herein.
After the voltage of each feeder line in the distribution network containing the ring is initialized, the injection power of each node is combined, and the injection current of each node is calculated upwards layer by layer from the tail end of the feeder line. Specifically, it can be obtained by formula (4):
wherein the content of the first and second substances,
for the injection current of node i during the kth iteration, SiInjected power, S, for node iiIt is possible to obtain from the basic parameters,
is the resulting voltage at node i during the (k-1) th iteration. While in the process of iteration 1,
is the initialized voltage of node i. And i is any node in the ring-containing power distribution network.
Here, it should be noted that: after the injection current of each node is obtained in each iteration process, the injection current of each node needs to be respectively brought into the I of the formula (1), the first branch current of each node is calculated, then the second branch current of each node is calculated by using the formula (2), and finally the second branch current is compensated for the first branch current according to the formula (3), so that the equivalent injection current is formed.
After the equivalent injection current is determined, the voltage of each layer of node of the ring-containing power distribution network can be sequentially calculated from the upper layer node to the lower layer node of the ring-containing power distribution network based on the basic parameters and the equivalent injection current in the ring-containing power distribution network comprising the virtual split node.
Specifically, it can be obtained by formula (5):
wherein the content of the first and second substances,
for the voltage at node j during the kth iteration,
is the voltage of a node i in the kth iteration process, the node i is the previous layer node of a node j, r is a branch between the node i and the node j, ZrIs the impedance of the branch r and,
the equivalent injection current of the branch r in the kth iteration process.
Step two: and determining the loop voltage of the loop circuit in which the virtual splitting node is positioned according to the voltage of the same layer of nodes of the power distribution network with the loop.
Specifically, it can be obtained by formula (6):
wherein the content of the first and second substances,
is the loop voltage of the loop l in the kth iteration process, the loop l is a ring loop in which the virtual splitting node m and the virtual splitting node n are located,
for the voltage at node m during the kth iteration,
is the voltage at node n during the kth iteration.
After the loop voltage of the loop l is obtained, the voltages of all loops in the distribution network with loops can be obtained, and the voltages of all loops in the distribution network with loops are obtained according to the loop voltage of the loop l by adopting the prior art, so that the details are not repeated herein.
Step three: and determining the loop current of the loop circuit in which the virtual splitting node is positioned according to the loop voltage.
Specifically, it can be obtained by formula (7):
wherein the content of the first and second substances,
for the voltage, Z, of all loops in the distribution network containing the ring in the k-th iteration processLThe impedance matrix of the ring-containing power distribution network can be obtained through basic parameters,
is the loop current of loop i during the kth iteration.
Here, it should be noted that:
can be equivalent to the equivalent injection current of the virtual split node m and the equivalent injection current of the virtual split node n, i.e.
Ibrkm＝-fLFormula (8)
Ibrkn＝fLFormula (9)
Step four: and determining branch current of a branch between the virtual split nodes of different layers of the ring-containing power distribution network based on the loop current of the virtual split nodes of different layers of the ring-containing power distribution network and the current generated by the power supply of the ring-containing power distribution network.
Specifically, it can be obtained by formula (10):
wherein the content of the first and second substances,
is the branch current, I, of branch l during the kth iterationbrkiIs the injection current of the virtual splitting node I, if I is not the virtual splitting node, IbrkiIs 0, l is the branch connected to node i,
for the branch current of branch j during the kth iteration,
the injection current generated by the power supply including the ring distribution network at the node i in the kth iteration process is the injection current, if the node i is not connected with the power supply, the node i is connected with the power supply
Is 0.
Step five: and recalculating the voltage of each layer of nodes of the ring-containing power distribution network according to the branch current of the branch between the virtual split nodes of different layers of the ring-containing power distribution network.
Generally, the voltage of each node is updated layer by layer from the root node of the feeder to the end of the feeder, and specifically, the voltage can be obtained according to equation (11):
wherein the content of the first and second substances,
for the voltage at node j during the kth iteration,
for the voltage of node i during the kth iterationNode i is the node on the upper layer of node j, l is the branch between node i and node j, ZlIs the impedance of the branch i and,
the branch current of branch l in the kth iteration is shown.
Step six: and comparing whether the difference value of the voltage of each layer of nodes of the newly-calculated ring-containing power distribution network and the voltage of the corresponding nodes calculated in sequence is smaller than a preset threshold value, if so, executing a seventh step, and if not, executing an eighth step.
Step seven: and taking the recalculated voltage of each layer of nodes of the ring-containing power distribution network as the voltage of each node in the ring-containing power distribution network.
Step eight: and taking the recalculated voltage of each layer node of the ring-containing power distribution network as the sequentially calculated voltage of each layer node of the ring-containing power distribution network, and recalculating the voltage of each layer node of the ring-containing power distribution network again until the difference between the recalculated voltage of each layer node of the ring-containing power distribution network and the sequentially calculated voltage of the corresponding node is smaller than a preset threshold value.
Illustratively, assume that the voltage at node j is calculated as
The voltage at node j is calculated to be
When in
And
when the difference value of (A) is less than a preset threshold value, the
As the voltage of node j; when in
And
when the difference value is greater than or equal to the preset threshold value, the voltage of the node j in the 5 th iteration process is continuously calculated
Judging again
And
whether the difference is less than a preset threshold value, if so
And
if the difference is still larger than the preset threshold, the voltage of the node j in the 6 th iteration process is continuously calculated
Judging again
And
whether the difference is less than a preset threshold value, if so
And
is less than a preset threshold value, will
As the voltage at node j.
It should be noted that: the preset threshold may be set according to actual conditions, and is not particularly limited herein.
S409: and determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network.
In step S105, the operation state of the distribution network including the ring is determined according to the voltage of each node in the distribution network including the ring has been described, and therefore, details are not described herein again. Therefore, the voltage of each node in the distribution network containing the ring is determined by adopting a forward-backward substitution mode, and the running state of the distribution network containing the ring is further determined.
The following describes an implementation process of the method for determining an operating state of a distribution network including a ring according to an embodiment of the present invention and beneficial effects that can be achieved by the method. Fig. 6 is a structural diagram of an IEEE33 node power distribution system according to an embodiment of the present invention, and referring to fig. 6, there are 33 nodes, 32 branches, 5 interconnection switch branches, and 1 power source in the IEEE33 node power distribution system. The basic parameters of an IEEE33 node power distribution system can be seen in table 1:
TABLE 1
Fig. 7 is a schematic diagram of branches and branches of an IEEE33 node power distribution system according to an embodiment of the present invention, and as shown in fig. 7, solid lines are the branches, broken lines are the branches, and arrows indicate loop directions.
After the basic parameters, branches and branches of the IEEE33 node power distribution system are determined, virtual split nodes can be constructed at the branches, the voltage of each node in the IEEE33 node power distribution system is obtained in a forward-backward substitution mode, and the running state of the IEEE33 node power distribution system is determined according to the voltage of each node.
Next, in order to explain that the determination method of the operation state of the distribution network including the ring according to the embodiment of the present invention is suitable for the actual situation when the voltage of each node in the distribution network including the ring is obtained, the above method is applied to the radiation distribution network and the distribution network including the ring to calculate the node voltage, and comparison is performed, where the distribution network including the ring is a distribution network in which an interconnection switch is added on the basis of the radiation distribution network, and a ring loop is formed.
Fig. 8 is a comparison graph of voltages of nodes obtained in the radiation distribution network and the ring-containing distribution network respectively under the IEEE33 node distribution system by using the determination method of the operation state of the ring-containing distribution network in the embodiment of the present invention, and it can be seen from fig. 8 that the voltages of the nodes obtained in the ring-containing distribution network by using the determination method of the operation state of the ring-containing distribution network are substantially consistent with the voltages of the nodes obtained in the radiation distribution network by using the determination method of the operation state of the ring-containing distribution network, and the voltages are raised at the ring loop of the ring-containing distribution network. Therefore, the method for determining the operation state of the distribution network with the ring provided by the embodiment of the invention can be used for determining that the voltage of each node in the distribution network with the ring really accords with the actual situation. Therefore, the method for determining the running state of the distribution network with the ring can obtain accurate node voltage, and further can accurately determine the running state of the distribution network with the ring.
Next, in order to illustrate that the determination method for the operation state of the distribution network with the ring, provided by the embodiment of the present invention, has higher efficiency in determining the operation state of the distribution network with the ring, for this reason, the determination method for the operation state of the distribution network with the ring, provided by the embodiment of the present invention, and the conventional forward-backward substitution method are respectively adopted for the distribution system with the IEEE33 node, and the voltages of the nodes in the distribution system with the IEEE33 node are calculated, so that the difference between the iteration times of the method provided by the embodiment of the present invention and the conventional forward-backward substitution method is compared, and the difference between the iteration times can be used to compare the efficiency of the two methods in the implementation process.
Fig. 9 is a comparison diagram of the number of iterations when the determination method of the operating state of the distribution network with loops and the conventional forward-backward substitution method are used to obtain the voltages of the nodes in the distribution system with IEEE33 nodes in the embodiment of the present invention, and as can be seen from fig. 9, the determination method of the operating state of the distribution network with loops provided in the embodiment of the present invention can approach the voltage difference, that is, the preset threshold value, faster with fewer iterations than the conventional forward-backward substitution method, so that the determination method of the operating state of the distribution network with loops provided in the embodiment of the present invention is more efficient in determining the operating state of the distribution network with loops, and further can efficiently determine the operating state of the distribution network with loops.
As can be seen from the above description, the method for determining the operating state of the distribution network with the ring, provided by the embodiment of the invention, can accurately and quickly perform load flow calculation on the distribution network with the ring, and further can accurately and quickly determine the efficiency of the operating state of the distribution network with the ring, so that the distribution network with the ring can be timely and effectively maintained when an abnormality occurs.
Based on the same inventive concept, as an implementation of the method, the embodiment of the invention also provides a device for determining the operation state of the ring-containing power distribution network. Fig. 10 is a schematic structural diagram of an apparatus for determining an operating state of a distribution network including a ring in an embodiment of the present invention, and referring to fig. 10, the apparatus 100 may include: a receiving module 1001 configured to obtain basic parameters and a topology structure of a power distribution network including a ring, where the basic parameters include: the head node, the tail node, the branch load and the position of the interconnection switch; a first determining module 1002, configured to determine a branch of the power distribution network including a ring according to the topology structure, where the branch and a part of branches in the power distribution network including the ring form a ring loop; a dividing module 1003 configured to construct a virtual division node at the branch, wherein the virtual division node divides the branch into two branches; the calculation module 1004 is configured to obtain voltages of nodes in the ring-containing power distribution network including the virtual split nodes based on the basic parameters in a forward-backward substitution manner; a second determining module 1005 configured to determine an operating state of the ring-included power distribution network according to the voltage of each node in the ring-included power distribution network.
Based on the foregoing embodiments, the calculation module is specifically configured to determine, at the virtual split node, a first branch current generated by a power supply of the ring-containing power distribution network, and determine a second branch current of a ring loop in which the virtual split node is located; compensating the first branch current by using the second branch current to generate equivalent injection current of the branch in which the virtual splitting node is positioned; in a ring-containing power distribution network comprising virtual split nodes, based on basic parameters and equivalent injection current, the voltage of each node in the ring-containing power distribution network is obtained by adopting a forward-backward substitution mode.
Based on the foregoing embodiment, the calculation module is specifically configured to determine, according to the topology structure, branches of the ring-containing power distribution network, where the branches are branches between associated nodes of different levels in the ring-containing power distribution network; determining a road matrix, a basic loop matrix and a loop impedance matrix of the distribution network containing the ring based on the branches, the branches and the basic parameters; determining a first branch current according to the road matrix and power supply parameters of the power distribution network with the ring; and determining the current of the second branch according to the basic loop matrix, the loop impedance matrix and the loop voltage of the power distribution network with the ring.
Based on the foregoing embodiments, the virtual split node includes: the current injection device comprises a first virtual splitting node and a second virtual splitting node, wherein the directions of equivalent injected currents of the first virtual splitting node and the second virtual splitting node are opposite.
Based on the foregoing embodiment, the calculation module is specifically configured to, in a ring-containing power distribution network including a virtual split node, sequentially calculate, from an upper node to a lower node of the ring-containing power distribution network, a voltage of each layer node of the ring-containing power distribution network based on a basic parameter and an equivalent injection current; determining the loop voltage of a loop circuit in which the virtual splitting node is positioned according to the voltage of the same layer of nodes of the power distribution network containing the loop; determining the loop current of the annular loop where the virtual splitting node is located according to the loop voltage; determining branch current of a branch between virtual split nodes on different layers of the ring-containing power distribution network based on loop current of the virtual split nodes on different layers of the ring-containing power distribution network and current generated by a power supply of the ring-containing power distribution network; recalculating the voltage of each layer of nodes of the ring-containing power distribution network according to the branch current of the branch between the virtual split nodes of different layers of the ring-containing power distribution network; comparing whether the difference value of the voltage of each layer of nodes of the newly-calculated power distribution network containing the ring and the voltage of the corresponding nodes calculated in sequence is smaller than a preset threshold value or not; if so, using the recalculated voltage of each layer of nodes of the ring-containing power distribution network as the voltage of each node in the ring-containing power distribution network; and if not, taking the recalculated voltage of each layer node of the ring-containing power distribution network as the sequentially calculated voltage of each layer node of the ring-containing power distribution network, and recalculating the voltage of each layer node of the ring-containing power distribution network again until the difference between the recalculated voltage of each layer node of the ring-containing power distribution network and the sequentially calculated voltage of the corresponding node is smaller than a preset threshold value.
Based on the foregoing embodiment, the first determining module is specifically configured to determine a root node of the ring-containing power distribution network according to the topology structure; from a root node, adopting breadth-first search to layer all nodes in the distribution network containing the ring; and taking branches between the nodes associated with the same layer as branches of the power distribution network with the ring.
Here, it should be noted that: the above description of the apparatus embodiments, similar to the above description of the method embodiments, has similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the apparatus according to the invention, reference is made to the description of the embodiments of the method according to the invention for understanding.
Based on the same inventive concept, the embodiment of the invention also provides electronic equipment. Fig. 11 is a schematic structural diagram of an electronic device in an embodiment of the present invention, and referring to fig. 11, the electronic device 110 may include: at least one processor 1101; and at least one memory 1102, bus 1103 connected to processor 1101; the processor 1101 and the memory 1102 complete communication with each other through the bus 1103; the processor 1101 is configured to call program instructions in the memory 1102 to perform the methods in one or more embodiments described above.
Here, it should be noted that: the above description of the embodiments of the electronic device is similar to the description of the embodiments of the method described above, and has similar advantageous effects to the embodiments of the method. For technical details not disclosed in the embodiments of the electronic device according to the embodiments of the present invention, please refer to the description of the method embodiments of the present invention.
Based on the same inventive concept, the embodiment of the present invention further provides a computer-readable storage medium, where the computer-readable storage medium includes a stored program, and when the program runs, the apparatus on which the storage medium is located is controlled to execute the method in one or more embodiments described above.
Here, it should be noted that: the above description of the computer-readable storage medium embodiments is similar to the description of the method embodiments described above, with similar beneficial effects as the method embodiments. For technical details not disclosed in the embodiments of the computer-readable storage medium of the embodiments of the present invention, reference is made to the description of the method embodiments of the present invention for understanding.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
In a typical configuration, a computing device includes one or more processors (CPUs), input/output interfaces, network interfaces, and memory.
The memory may include forms of volatile memory in a computer readable medium, Random Access Memory (RAM) and/or non-volatile memory, such as Read Only Memory (ROM) or flash memory (flash RAM). The memory is an example of a computer-readable medium.
Computer-readable media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
It should also be noted that the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising an … …" does not exclude the presence of other identical elements in the process, method, article, or apparatus that comprises the element.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The above are merely examples of the present application and are not intended to limit the present application. Various modifications and changes may occur to those skilled in the art. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present application should be included in the scope of the claims of the present application.
Claims (8)
1. A method for determining an operating condition of a distribution network including a ring, the method comprising:
obtaining basic parameters and a topological structure of a ring-containing power distribution network, wherein the basic parameters comprise: the head node, the tail node, the branch load and the position of the interconnection switch;
determining connecting branches of the ring-containing power distribution network according to the topological structure, wherein the connecting branches and partial branches in the ring-containing power distribution network form a ring loop;
constructing a virtual splitting node at the connecting branch, wherein the virtual splitting node divides the connecting branch into two branches;
acquiring the voltage of each node in the ring-containing power distribution network containing the virtual split node based on the basic parameters in a forward-backward substitution mode;
determining the running state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network;
in the ring-containing power distribution network including the virtual split node, acquiring the voltage of each node in the ring-containing power distribution network by adopting a forward-backward substitution mode based on the basic parameters, wherein the method comprises the following steps:
determining, at the virtual split node, a first branch current generated by a power source of the ring-containing power distribution network and a second branch current of a ring loop in which the virtual split node is located;
compensating the first branch current by using the second branch current to generate an equivalent injection current of the branch in which the virtual splitting node is positioned;
and in a ring-containing power distribution network comprising the virtual split node, acquiring the voltage of each node in the ring-containing power distribution network by adopting a forward-backward substitution mode based on the basic parameters and the equivalent injection current.
2. The method of claim 1, wherein determining, at the virtual split node, a first branch current generated by a power source of the ring-containing power distribution network and determining a second branch current of a ring loop in which the virtual split node is located comprises:
determining branches of the ring-containing power distribution network according to the topological structure, wherein the branches are branches between associated nodes of different levels in the ring-containing power distribution network;
determining a road matrix, a basic loop matrix and a loop impedance matrix of the ring-containing power distribution network based on the branches, the branches and the basic parameters;
determining the first branch current according to the road matrix and the power supply parameters of the ring-containing power distribution network;
and determining the second branch current according to the basic loop matrix, the loop impedance matrix and the loop voltage of the ring-containing power distribution network.
3. The method of claim 1, wherein the virtual splitting node comprises: a first virtual split node and a second virtual split node, the first virtual split node and the second virtual split node having equivalent injected currents in opposite directions.
4. The method according to claim 1, wherein the obtaining voltages of nodes in the ring-containing power distribution network including the virtual split node by using a forward-backward substitution method based on the basic parameters and the equivalent injection current comprises:
in a ring-containing power distribution network comprising the virtual split node, sequentially calculating the voltage of each layer of node of the ring-containing power distribution network from an upper layer node to a lower layer node of the ring-containing power distribution network based on the basic parameters and the equivalent injection current;
determining the loop voltage of a loop circuit in which the virtual splitting node is located according to the voltage of the same layer of nodes of the power distribution network with the loop;
determining the loop current of the annular loop in which the virtual splitting node is positioned according to the loop voltage;
determining branch circuit current of a branch circuit between virtual split nodes of different layers of the ring-containing power distribution network based on loop current of the virtual split nodes of different layers of the ring-containing power distribution network and current generated by a power supply of the ring-containing power distribution network;
recalculating the voltage of each layer of nodes of the ring-containing power distribution network according to the branch current of the branch between the virtual split nodes of different layers of the ring-containing power distribution network;
comparing whether the difference value of the voltage of each layer of nodes of the ring-containing power distribution network which is recalculated and the voltage of the corresponding nodes which is calculated in sequence is smaller than a preset threshold value or not;
if so, taking the recalculated voltage of each layer of nodes of the ring-containing power distribution network as the voltage of each node in the ring-containing power distribution network;
if not, the recalculated voltage of each layer of node of the distribution network containing rings is used as the sequentially calculated voltage of each layer of node of the distribution network containing rings, and the voltage of each layer of node of the distribution network containing rings is recalculated again until the difference value between the recalculated voltage of each layer of node of the distribution network containing rings and the sequentially calculated voltage of the corresponding node is smaller than the preset threshold value.
5. The method according to any one of claims 1 to 4, wherein the determining the branches of the distribution network comprising rings according to the topology comprises:
determining a root node of the ring-containing power distribution network according to the topological structure;
from the root node, adopting breadth-first search to layer all nodes in the ring-containing power distribution network;
and taking branches between the nodes associated with the same layer as branches of the power distribution network with the ring.
6. An apparatus for determining an operating condition of a power distribution network including a ring, the apparatus comprising:
the receiving module is configured to acquire basic parameters and a topological structure of the ring-containing power distribution network, wherein the basic parameters comprise: the head node, the tail node, the branch load and the position of the interconnection switch;
a first determining module configured to determine a branch of the distribution network containing rings according to the topological structure, wherein the branch and a part of branches in the distribution network containing rings form a ring loop;
a dividing module configured to construct a virtual splitting node at the connecting branch, the virtual splitting node dividing the connecting branch into two branches;
the calculation module is configured to acquire voltages of nodes in the ring-containing power distribution network based on the basic parameters and in a forward-backward substitution mode in the ring-containing power distribution network including the virtual split node;
the second determining module is configured to determine the operation state of the ring-containing power distribution network according to the voltage of each node in the ring-containing power distribution network;
the calculation module is specifically configured to determine, at the virtual split node, a first branch current generated by a power source of the ring-containing power distribution network and a second branch current of a ring loop in which the virtual split node is located; compensating the first branch current by using the second branch current to generate an equivalent injection current of the branch in which the virtual splitting node is positioned; and in a ring-containing power distribution network comprising the virtual split node, acquiring the voltage of each node in the ring-containing power distribution network by adopting a forward-backward substitution mode based on the basic parameters and the equivalent injection current.
7. An electronic device, characterized in that the electronic device comprises:
at least one processor;
and at least one memory, bus connected with the processor;
the processor and the memory complete mutual communication through the bus; the processor is configured to invoke program instructions in the memory to perform the method of any of claims 1 to 5.
8. A computer-readable storage medium, characterized in that the storage medium comprises a stored program, wherein the program, when executed, controls an apparatus on which the storage medium is located to perform the method according to any of claims 1 to 5.
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