CN-121986428-A - Reactive power take-off and take-in control

Abstract

A method, computer program product and computer system for controlling the export and import of reactive power by nodes of a network. One node of the network (capable of deriving Q units of reactive power to the network) and N nodes of the network (each capable of deriving reactive power from the network) are identified. Initially, Q >0 or Q <0. The N nodes are ordered in ascending order of relative distance between one node and each of the N nodes. And executing circulation on the N nodes after sequencing. The next iteration of the loop includes transmitting a first electromagnetic signal and a second electromagnetic signal to a first node and a next node, instructing the first node and the next node to derive an amount q# of reactive power and to direct an amount of reactive power, respectively, and updating Q by Q = Q-q#.

Inventors

• R. R. Koluri
• J. A.W. Rowling
• G. Ghana

Assignees

• 国际商业机器公司

Dates

Publication Date

20260505

Application Date

20240930

Priority Date

20231012

Claims (20)

1. 1. A method for a central controller of an electrical power distribution network to control the export and import of reactive power by nodes of the network, the method comprising: Identifying, by the central controller, one node of the network having the ability to export Q units of reactive power to the network and N nodes of the network each having the ability to import reactive power from the network, wherein the N nodes do not include the one node, wherein N is at least 2, and wherein initially Q >0 or Q <0; Ordering, by the central controller, the N nodes in ascending order of relative distance from the one node, wherein the nodes ordered in ascending order are denoted as node 1,..once, node N, each having the ability to import Q 1 、...、Q N units of reactive power and the relative distance from the one node is R 1 、...、R N , each; setting a node index n to 0 by the central controller; Performing a loop on the ordered N nodes, a next iteration of the loop comprising: Increasing n by 1 by the central controller; Calculating, by the central controller, Q 'as a function of Q, Q n and m (R n ), wherein Q' represents the amount of reactive power to be derived by the one node to the network, and wherein m (R n ) is a reactive power scaling factor as a function of R n ; transmitting, by the central controller, a first electromagnetic signal to the one node instructing the one node to derive an amount Q' of reactive power to the network; Calculating Q "by the central controller as a function of Q' and Q n , wherein Q" represents the amount of reactive power to be imported from the network by node n; transmitting, by the central controller, a second electromagnetic signal to node n, indicating to node n to import an amount Q' of reactive power from the network, and After the one node has derived the amount Q 'of reactive power to the network, q=q-Q' is calculated by the central controller, then a loop is exited if ABS (Q) =0 or n=n, otherwise a branch is made by the central controller to the increment N by 1 to perform the next iteration of the loop.
2. 2. The method of claim 1, wherein the calculating Q' comprises: Calculate P n = Q n *(1 + m(R n )) If ABS (Q) -ABS (P n ) > 0, then Q '=p n is calculated, otherwise Q' =q is calculated.
3. 3. The method of claim 1, wherein the calculating Q "comprises: if ABS (Q') -ABS (Q n ) > 0, then Q "=q n is calculated, otherwise Q" =q is calculated.
4. 4. The method of claim 1, wherein Q >0 is initially.
5. 5. The method of claim 1, wherein Q <0 is initially.
6. 6. The method of claim 1, wherein only one iteration of the loop is performed.
7. 7. The method of claim 1, wherein at least two iterations of the loop are performed.
8. 8. The method of claim 7, wherein only less than N-1 iterations of the loop are performed.
9. 9. The method of claim 1, wherein N-1 iterations of the loop are performed.
10. 10. The method of claim 1, the method further comprising: Calculating, by the central controller, t=abs (Q '/(1+t (R n ))) if the calculating Q ' comprises calculating Q ' =q, otherwise calculating, by the central controller, t=q, where T (R n ) is a token scaling factor as a function of R n , and The node n is provided by the central controller with T tokens that can then be exchanged with the network for real or reactive power.
11. 11. A computer program product comprising one or more computer-readable hardware storage devices having computer-readable program code stored therein, the program code containing instructions executable by one or more processors in a computer system to implement a method for a central controller of a power distribution network to control the export and import of reactive power by nodes of the network, the method comprising: Identifying, by the central controller, one node of the network having the ability to export Q units of reactive power to the network and N nodes of the network each having the ability to import reactive power from the network, wherein the N nodes do not include the one node, wherein N is at least 2, and wherein initially Q >0 or Q <0; Ordering, by the central controller, the N nodes in ascending order of relative distance from the one node, wherein the nodes ordered in ascending order are denoted as node 1,..once, node N, each having the ability to import Q 1 、...、Q N units of reactive power and the relative distance from the one node is R 1 、...、R N , each; setting a node index n to 0 by the central controller; Performing a loop on the ordered N nodes, a next iteration of the loop comprising: Increasing n by 1 by the central controller; Calculating, by the central controller, Q 'as a function of Q, Q n and m (R n ), wherein Q' represents the amount of reactive power to be derived by the one node to the network, and wherein m (R n ) is a reactive power scaling factor as a function of R n ; transmitting, by the central controller, a first electromagnetic signal to the one node instructing the one node to derive an amount Q' of reactive power to the network; Calculating Q "by the central controller as a function of Q' and Q n , wherein Q" represents the amount of reactive power to be imported from the network by node n; transmitting, by the central controller, a second electromagnetic signal to node n, indicating to node n to import an amount Q' of reactive power from the network, and After the one node has derived the amount Q 'of reactive power to the network, q=q-Q' is calculated by the central controller, then a loop is exited if ABS (Q) =0 or n=n, otherwise a branch is made by the central controller to the increment N by 1 to perform the next iteration of the loop.
12. 12. The computer program product of claim 11, wherein the calculating Q' comprises: Calculate P n = Q n *(1 + m(R n )) If ABS (Q) -ABS (P n ) > 0, then Q '=p n is calculated, otherwise Q' =q is calculated.
13. 13. The computer program product of claim 11, wherein the calculating Q "comprises: If ABS (Q') -ABS (Q n ) > 0, then Q "=q n is calculated, otherwise Q" =q is calculated.
14. 14. The computer program product of claim 11, wherein Q >0 is initially.
15. 15. The computer program product of claim 11, wherein Q <0 is initially.
16. 16. A computer system comprising one or more processors, one or more memories, and one or more computer-readable hardware storage devices containing program code executable by the one or more processors via the one or more memories to implement a method for a central controller of a power distribution network to control the export and import of reactive power by nodes of the network, the method comprising: Identifying, by the central controller, one node of the network having the ability to export Q units of reactive power to the network and N nodes of the network each having the ability to import reactive power from the network, wherein the N nodes do not include the one node, wherein N is at least 2, and wherein initially Q >0 or Q <0; Ordering, by the central controller, the N nodes in ascending order of relative distance from the one node, wherein the nodes ordered in ascending order are denoted as node 1,..once, node N, each having the ability to import Q 1 、...、Q N units of reactive power and the relative distance from the one node is R 1 、...、R N , each; setting a node index n to 0 by the central controller; Performing a loop on the ordered N nodes, a next iteration of the loop comprising: Increasing n by 1 by the central controller; Calculating, by the central controller, Q 'as a function of Q, Q n and m (R n ), wherein Q' represents the amount of reactive power to be derived by the one node to the network, and wherein m (R n ) is a reactive power scaling factor as a function of R n ; transmitting, by the central controller, a first electromagnetic signal to the one node instructing the one node to derive an amount Q' of reactive power to the network; Calculating Q "by the central controller as a function of Q' and Q n , wherein Q" represents the amount of reactive power to be imported from the network by node n; transmitting, by the central controller, a second electromagnetic signal to node n, indicating to node n to import an amount Q' of reactive power from the network, and After the one node has derived the amount Q 'of reactive power to the network, q=q-Q' is calculated by the central controller, then a loop is exited if ABS (Q) =0 or n=n, otherwise a branch is made by the central controller to the increment N by 1 to perform the next iteration of the loop.
17. 17. The computer system of claim 16, wherein the computing Q' comprises: Calculate P n = Q n *(1 + m(R n )) If ABS (Q) -ABS (P n ) >0, then Q '=p n is calculated, otherwise Q' =q is calculated.
18. 18. The computer system of claim 16, wherein the computing Q "comprises: If ABS (Q') -ABS (Q n ) > 0, then Q "=q n is calculated, otherwise Q" =q is calculated.
19. 19. The computer system of claim 16, wherein initially Q >0.
20. 20. The computer system of claim 16, wherein initially Q <0.

Description

Reactive power take-off and take-in control Background The present invention relates to the control of reactive power of an electrical power distribution network, and more particularly to the control of the export and import of reactive power by nodes of the network. Disclosure of Invention Embodiments of the present invention provide a method, computer program product and computer system for a central controller of a power distribution network to control the export and import of reactive power by nodes of the network. The central controller identifies one node of the network having the ability to export Q units of reactive power to the network and N nodes of the network having the ability to import reactive power from the network, wherein the N nodes do not include the one node, wherein N is at least 2, and wherein initially Q >0 or Q <0. The central controller sorts the N nodes in ascending order of relative distance from the one node, wherein the nodes sorted in ascending order are denoted as node 1, node N has the ability to import Q 1,...,QN units of reactive power, respectively, and the relative distance from the one node is R 1,...,RN, respectively. The central controller sets the node index n to 0. The central controller performs a loop on the ordered N nodes and the next iteration of the loop includes the following steps. The central controller increases n by 1. The central controller calculates Q 'as a function of Q, Q n and m (R n), where Q' represents the amount of reactive power to be derived by the one node to the network, and where m (R n) is the reactive power scaling factor as a function of R n. The central controller sends a first electromagnetic signal to the one node instructing the one node to derive an amount Q' of reactive power to the network. The central controller calculates Q "as a function of Q' and Q n, where Q" represents the amount of reactive power to be imported from the network by node n. The central controller sends a second electromagnetic signal to node n indicating that node n is introducing an amount Q "of reactive power from the network. After the one node has derived the amount Q 'of reactive power to the network, the central controller calculates q=q-Q', then exits the loop if ABS (Q) =0 or n=n, otherwise the central controller branches to increment N by 1 to perform the next iteration of the loop. Drawings Fig. 1 shows an architecture of a power distribution network according to an embodiment of the invention. Fig. 2 is a flow chart describing a method for a central controller of a power distribution network to control the export and import of reactive power by nodes of the network according to an embodiment of the invention. Fig. 3 is a flow chart describing an embodiment of calculating the amount of reactive power to be derived to the network by one node of the power distribution network according to an embodiment of the invention. Fig. 4 is a flow chart describing an embodiment of calculating the amount of reactive power to be imported from the network by a node of the power distribution network according to an embodiment of the invention. Fig. 5 shows an allowable mathematical form of a scale factor according to an embodiment of the invention. Fig. 6 illustrates allowable sources of scale factors according to an embodiment of the invention. FIG. 7 illustrates a computer system according to an embodiment of the invention. FIG. 8 illustrates a computing environment containing an example of an environment for running at least a portion of the computer code involved in performing the methods of the present invention, according to an embodiment of the present invention. Detailed Description According to a certain aspect of the invention, wherein a central controller of the power distribution network controls the nodes of the network to export and import reactive power, the central controller identifies one node of the network having the ability to export Q units of reactive power to the network and N nodes of the network having the ability to import reactive power from the network, wherein the N nodes do not comprise the one node, wherein N is at least 2, and wherein initially Q >0 or Q <0. The central controller sorts the N nodes in ascending order of relative distance from the one node, wherein the nodes sorted in ascending order are denoted as node 1, node N has the ability to import Q 1,...,QN units of reactive power, respectively, and the relative distance from the one node is R 1,...,RN, respectively. The central controller sets the node index n to 0. The central controller performs a loop on the ordered N nodes and the next iteration of the loop includes the following steps. The central controller increases n by 1. The central controller calculates Q 'as a function of Q, Q n and m (R n), where Q' represents the amount of reactive power to be derived by the one node to the network, and where m (R n) is the reactive power scaling factor as a function of R n. Th