CN112260288A - Method and device for adjusting node voltage in power system - Google Patents
Method and device for adjusting node voltage in power system Download PDFInfo
- Publication number
- CN112260288A CN112260288A CN202011136615.9A CN202011136615A CN112260288A CN 112260288 A CN112260288 A CN 112260288A CN 202011136615 A CN202011136615 A CN 202011136615A CN 112260288 A CN112260288 A CN 112260288A
- Authority
- CN
- China
- Prior art keywords
- node
- voltage
- value
- target
- determining
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/12—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load
- H02J3/16—Circuit arrangements for ac mains or ac distribution networks for adjusting voltage in ac networks by changing a characteristic of the network load by adjustment of reactive power
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/10—Power transmission or distribution systems management focussing at grid-level, e.g. load flow analysis, node profile computation, meshed network optimisation, active network management or spinning reserve management
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2203/00—Indexing scheme relating to details of circuit arrangements for AC mains or AC distribution networks
- H02J2203/20—Simulating, e g planning, reliability check, modelling or computer assisted design [CAD]
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E40/00—Technologies for an efficient electrical power generation, transmission or distribution
- Y02E40/30—Reactive power compensation
Abstract
The application provides a method and a device for adjusting node voltage in an electric power system. Determining a first voltage difference value of each node according to a first voltage value of each node in a power system and a second voltage value of each node; if the first out-of-limit node exists, determining a voltage vector to be adjusted; determining a target reactive compensation node and a target power generation node; determining a reactive power sensitivity matrix according to the Jacobian matrix and a preset unit reactive power value; determining a voltage sensitivity matrix according to the Jacobian matrix and a preset unit voltage value; determining an integral sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix; determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted; and correspondingly adjusting the reactive power value of the target reactive power compensation node and the voltage value of the target power generation node according to the adjustment vector. The method provided by the application avoids a large amount of manual analysis and improves the efficiency.
Description
Technical Field
The present disclosure relates to the field of power technologies, and in particular, to a method and an apparatus for adjusting node voltage in a power system.
Background
An electric power system is a dynamic system whose branch transmission power, node voltage, etc. are constantly changing (the power flow of the electric power system is called "power flow"), for example, an increase in power consumption causes a change in the power flow of the electric power system. In order to cope with various changes of the power system and ensure the safety and stability of the power system, a worker needs to simulate the possible future state of the power system. And when different states are simulated, corresponding power flow adjustment needs to be performed. In the simulation of the power system, a generator or a section of bus in the power system corresponds to a node, and the voltage of the node is closely related to the power flow. After the power flow is adjusted, the voltage values of the nodes of the power system may deviate from the expected values.
At present, the voltage of each node of the power system is generally adjusted by a manual adjustment method, that is, the voltage value of each node is made to approach the expected value by manually adjusting each node one by one. Nodes in the power system can be classified into reactive compensation nodes (the reactive power of the nodes can be adjusted), power generation nodes (the voltage of the nodes can be adjusted) and other nodes according to the reactive adjustable characteristic of the nodes. If the nodes are adjusted by adopting a manual adjustment method, the common method is to adjust the voltage values of the nodes nearby the reactive compensation nodes by adopting a method of increasing or decreasing the reactive power value of the reactive compensation nodes; and (3) adopting a method of increasing or decreasing the voltage value of the power generation node to adjust the voltage value of the nearby node. However, voltages at different nodes are correlated, and after the voltage value of one node changes, the voltage values of other nodes also change correspondingly. The manual adjustment method needs to be explored, the influence of other nodes on a specific node is considered, and the manual adjustment method is large in workload, low in efficiency and high in time and energy consumption.
Therefore, a method for adjusting the node voltage in the power system is needed to solve the problem of low efficiency caused by manual node voltage adjustment in the prior art.
Disclosure of Invention
The application provides a method and a device for adjusting node voltage in an electric power system, which can be used for solving the problem of low efficiency caused by adjusting the node voltage by a manual method in the prior art.
In a first aspect, the present application provides a method for adjusting a node voltage in an electrical power system, the method including:
determining a first voltage difference value of each node according to a first voltage value of each node in the power system before power flow adjustment and a second voltage value of each node after power flow adjustment;
judging whether a first out-of-limit node with the first voltage difference value larger than a preset voltage difference threshold exists in each node, and if the first out-of-limit node exists, determining a voltage vector to be adjusted according to the first voltage difference values of all the first out-of-limit nodes;
determining a target reactive compensation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined reactive compensation node in the power system; the target reactive compensation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the reactive power value of the target reactive compensation node;
determining a target power generation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined power generation node in the power system; the target power generation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the voltage value of the target power generation node;
sequentially determining the sensitivity of the target reactive power compensation node according to the Jacobian matrix and a preset unit reactive power value; the sensitivity of the target reactive power compensation node is that the target reactive power compensation node increases or decreases the preset unit reactive power value to cause voltage change values corresponding to other nodes; the Jacobian matrix comprises a reactive power change value of a reactive compensation node and a corresponding relation with voltage change values of other nodes;
determining a reactive power sensitivity matrix according to the sensitivities of all target reactive compensation nodes;
sequentially determining the sensitivity of a target power generation node according to the Jacobian matrix and a preset unit voltage value; the sensitivity of the target power generation node is that the target power generation node increases or decreases a preset unit voltage value to cause voltage change values corresponding to other nodes; the Jacobian matrix after the dimensionality change comprises a voltage change value of the power generation node and a corresponding relation with voltage change values of other nodes;
determining a voltage sensitivity matrix according to the sensitivities of all target power generation nodes;
determining an overall sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix;
determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted; the adjustment vector comprises a reactive power adjustment value corresponding to the target reactive compensation node and a voltage adjustment value corresponding to the target power generation node; the reactive power adjustment value is a reactive power value which needs to be increased or decreased by the target reactive compensation node; the voltage adjustment value is a voltage value which needs to be increased or decreased by the target power generation node;
correspondingly adjusting the reactive power value of the target reactive power compensation node according to the reactive power adjustment value corresponding to the target reactive power compensation node in the adjustment vector;
and correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector.
With reference to the first aspect, in an implementation manner of the first aspect, the reactive power value of the target reactive power compensation node is correspondingly adjusted according to the reactive power adjustment value corresponding to the target reactive power compensation node in the adjustment vector; after correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector, the method further includes:
determining a second voltage difference value of each node according to the first voltage value of each node in the power system and the third voltage value of each node; the third voltage value of the node is the voltage value of each node after the target reactive compensation node and the target power generation node are adjusted;
judging whether a second out-of-limit node with a second voltage difference value larger than the preset voltage difference threshold exists in each node or not; and if the second out-of-limit nodes exist, returning to the step of determining the voltage vector to be adjusted according to the second voltage difference values of all the second out-of-limit nodes until the second out-of-limit nodes do not exist in each node.
With reference to the first aspect, in an implementation manner of the first aspect, the method further includes:
and if the first out-of-limit node does not exist in each node, keeping the second voltage value of each current node.
With reference to the first aspect, in an implementation manner of the first aspect, determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted includes:
and determining the vector to be adjusted by utilizing a least square method according to the overall sensitivity matrix and the voltage vector to be adjusted.
In a second aspect, the present application provides an apparatus for regulating a node voltage in an electrical power system, the apparatus comprising:
the determining module is used for determining a first voltage difference value of each node according to a first voltage value of each node in the power system before power flow adjustment and a second voltage value of each node after power flow adjustment;
the judging module is used for judging whether a first out-of-limit node with the first voltage difference value larger than a preset voltage difference threshold exists in each node;
the determining module is further configured to determine a voltage vector to be adjusted according to first voltage difference values of all the first out-of-limit nodes if the first out-of-limit nodes exist; determining a target reactive compensation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined reactive compensation node in the power system; the target reactive compensation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the reactive power value of the target reactive compensation node; determining a target power generation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined power generation node in the power system; the target power generation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the voltage value of the target power generation node; sequentially determining the sensitivity of the target reactive power compensation node according to the Jacobian matrix and a preset unit reactive power value; the sensitivity of the target reactive power compensation node is that the target reactive power compensation node increases or decreases the preset unit reactive power value to cause voltage change values corresponding to other nodes; the Jacobian matrix comprises a reactive power change value of a reactive compensation node and a corresponding relation with voltage change values of other nodes; determining a reactive power sensitivity matrix according to the sensitivities of all target reactive compensation nodes;
the determining module is further used for sequentially determining the sensitivity of the target power generation node according to the Jacobian matrix and a preset unit voltage value; the sensitivity of the target power generation node is that the target power generation node increases or decreases a preset unit voltage value to cause voltage change values corresponding to other nodes; the Jacobian matrix comprises a voltage change value of the power generation node and a corresponding relation with voltage change values of other nodes; determining a voltage sensitivity matrix according to the sensitivities of all target power generation nodes; determining an overall sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix; determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted; the adjustment vector comprises a reactive power adjustment value corresponding to the target reactive compensation node and a voltage adjustment value corresponding to the target power generation node; the reactive power adjustment value is a reactive power value which needs to be increased or decreased by the target reactive compensation node; the voltage adjustment value is a voltage value which needs to be increased or decreased by the target power generation node;
the adjusting module is used for correspondingly adjusting the reactive power value of the target reactive power compensation node according to the reactive power adjusting value corresponding to the target reactive power compensation node in the adjusting vector; and correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector.
With reference to the second aspect, in an implementation manner of the second aspect, the determining module is further configured to:
determining a second voltage difference value of each node according to the first voltage value of each node in the power system and the third voltage value of each node; the third voltage value of the node is the voltage value of each node after the target reactive compensation node and the target power generation node are adjusted;
the judging module is further configured to judge whether a second out-of-limit node exists in each node, where a second voltage difference value is greater than the preset voltage difference threshold;
the determining module is further configured to, if the second out-of-limit node exists, return to the step of determining the voltage vector to be adjusted according to the second voltage difference values of all the second out-of-limit nodes until the second out-of-limit node does not exist in each node.
With reference to the second aspect, in an implementation manner of the second aspect, the apparatus further includes:
and the holding module is used for holding the second voltage value of each current node if the first out-of-limit node does not exist in each node.
With reference to the second aspect, in an implementation manner of the second aspect, the determining module is specifically configured to:
and determining the vector to be adjusted by utilizing a least square method according to the overall sensitivity matrix and the voltage vector to be adjusted.
The present application utilizes matrix determination
The method provided by the application utilizes a matrix method to determine the corresponding adjustment amount of each node needing to be adjusted in the power system in each adjustment process, so that a large amount of manual analysis is avoided, the efficiency is improved, and the adjustment accuracy is ensured.
Drawings
Fig. 1 is a schematic flowchart illustrating a method for adjusting a node voltage in an electrical power system according to an embodiment of the present disclosure;
fig. 2 is a schematic structural diagram of an apparatus for adjusting a node voltage in an electrical power system according to an embodiment of the present disclosure.
Detailed Description
To make the objects, technical solutions and advantages of the present application more clear, embodiments of the present application will be described in further detail below with reference to the accompanying drawings.
Fig. 1 is a schematic flow chart illustrating a method for adjusting a node voltage in an electrical power system according to an embodiment of the present disclosure. The embodiment of the application comprises the following steps:
step 101, determining a first voltage difference value of each node according to a first voltage value of each node in the power system before power flow adjustment and a second voltage value of each node after power flow adjustment.
Specifically, assume that there are N in the power systemA node, wherein the first voltage value of the node with the number i before the power flow adjustment is expressed as
The set of first voltage values of the N nodes before power flow adjustment is expressed as
The second voltage value after power flow regulation for the ith node is expressed as
The set of second voltage values of the N nodes before power flow adjustment is expressed as
The first voltage difference is determined using the following method:
in the formula (1), Δ ub,iA first voltage difference value for the ith node;
a first voltage value before power flow adjustment is carried out on the ith node;
and adjusting the second voltage value of the ith node after power flow adjustment.
Step 102, judging whether a first out-of-limit node with a first voltage difference value larger than a preset voltage difference threshold exists in each node. If there is a first off-limit node, step 103 is performed, otherwise step 115 is performed.
And if the first voltage difference value of any one node is larger than the preset voltage difference value, the node is a first out-of-limit node.
Step 103, determining a voltage vector to be adjusted according to the first voltage difference values of all the first out-of-limit nodes.
Specifically, the voltage vector to be adjusted is determined as Δ U by the following methodb＝[Δub,1 Δub,2 … Δub,N0]Wherein, Δ ub,iIs the first voltage difference at the ith node.
And 104, determining a target reactive compensation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined reactive compensation node in the power system.
The target reactive compensation node is a node which is determined in advance to be capable of adjusting the voltage values of other nodes by increasing or decreasing the reactive power value of the target reactive compensation node.
Specifically, the nodes of the power system may be divided into reactive compensation nodes, power generation nodes, and other nodes in advance according to their own properties.
And 105, determining a target power generation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of the predetermined power generation node in the power system.
The target power generation node is a node which has been determined in advance to be able to adjust the voltage values of other nodes by increasing or decreasing its own voltage value.
And step 106, sequentially determining the sensitivity of the target reactive compensation node according to the Jacobian matrix and the preset unit reactive power value.
Specifically, the sensitivity of the target reactive power compensation node is a voltage change value corresponding to each other node caused by increasing or decreasing a preset unit reactive power value of the target reactive power compensation node. The Jacobian matrix comprises a reactive power change value of the reactive compensation node and a corresponding relation with voltage change values of other nodes. The Jacobian matrix in the embodiment of the application is a Jacobian matrix in power flow calculation by applying a Newton-Raphson iteration method in a power system.
In order to more clearly illustrate the embodiments of the present application, the jacobian matrix is described below.
For a system consisting of N nodes, the corresponding power flow adjustment equation is:
in the formula (2), PiAn active power value adjusted for the ith node; qiReactive power regulated for the ith node; u. ofiA second voltage value of the ith node; deltaijIs the phase angle difference between the ith node and the jth node, wherein when i equals j, δij0; when i ═ j, GijIs the self-conductance of the ith node; when i ≠ j, GijIs the mutual conductance between the ith node and the jth node; when i ═ j, BijIs the self susceptance of the ith node; when i ≠ j, BijIs the mutual susceptance between the ith node and the jth node.
In the process of adjusting the power flow, the corresponding Jacobian matrix is as follows:
in the formula (3), the matrix H is an (N-1) × (N-1) matrix, and each element of the matrix H is:
in the formula (4), HijIs the element of the ith row and the jth column in the matrix H; qiReactive power regulated for the ith node; u. ofiA second voltage value of the ith node; deltaijIs the phase angle difference between the ith node and the jth node, wherein when i equals j, δij0; when i ═ j, GijIs the self-conductance of the ith node; when i ≠ j, GijIs the mutual conductance between the ith node and the jth node; when i ═ j, BijIs the self susceptance of the ith node; when i ≠ j, BijIs the mutual susceptance between the ith node and the jth node.
In the formula (3), the matrix R is a (N-1) × (N-M-1) matrix, and each element of the matrix R is as follows:
in the formula (5), RijIs the element of the ith row and the jth column in the matrix R; piAn active power value adjusted for the ith node; u. ofiA second voltage value of the ith node; deltaijIs the phase angle difference between the ith node and the jth node, wherein when i equals j, δij0; when i ═ j, GijIs the self-conductance of the ith node; when i ≠ j, GijIs the mutual conductance between the ith node and the jth node; when i ═ j, BijIs the self susceptance of the ith node; when i ≠ j, BijIs the mutual susceptance between the ith node and the jth node.
In the formula (3), the matrix K is an (N-M-1) x (N-1) matrix, and each element of the matrix K is as follows:
in the formula (6), KijIs the element of the ith row and the jth column in the matrix K; piAn active power value adjusted for the ith node; u. ofiA second voltage value of the ith node; deltaijIs the phase angle difference between the ith node and the jth node, wherein when i equals j, δij0; when i ═ j, GijIs the self-conductance of the ith node; when i ≠ j, GijIs the mutual conductance between the ith node and the jth node; when i ═ j, BijIs the self susceptance of the ith node; when i ≠ j, BijIs the mutual susceptance between the ith node and the jth node.
In the formula (3), the matrix L is a (N-M-1) x (N-M-1) matrix, and each element of the matrix L is:
in the formula (7), LijIs the element of the ith row and the jth column in the matrix L; qiReactive power regulated for the ith node; u. ofiA second voltage value of the ith node; deltaijIs the phase angle difference between the ith node and the jth node, wherein when i equals j, δij0; when i ═ j, GijIs the self-conductance of the ith node; when i ≠ j, GijIs the mutual conductance between the ith node and the jth node; when i ═ j, BijIs the self susceptance of the ith node; when i ≠ j, BijIs the mutual susceptance between the ith node and the jth node.
Correspondingly, the matrix expression form of the power correction equation is as follows:
in the formula (8), Δ P is an active power change value of each node; delta Q is the reactive power change value of each node;
is a Jacobian matrix; delta theta is an angle change value of each node; Δ U is a voltage change value of each node.
When the sensitivity of the ith target reactive compensation node to other nodes is obtained, in order to check the influence of other factors, the delta Q is set to [0 … delta Q ]i … 0]. Wherein the reactive power change value except the ith target reactive power compensation node is delta qi，ΔqiAny one preset unit reactive power value; the reactive power change value of all other nodes is 0; let Δ P equal to 0, i.e. excluding the influence of the active power values of all nodes on other nodes. And delta theta is an independent quantity, and the sensitivity of the ith target reactive compensation node can be obtained according to the formula (7) as follows:
KQi＝[Δu1 Δu2 … ΔuN-M-1]formula (9)
In formula (9), KQiFor the sensitivity of the i-th target reactive compensation node, Δ ujIs shown asReactive power value change delta q of i target reactive compensation nodesiWhen the voltage value of the jth node changes by Δ uj(ii) a When the target reactive compensation node is far away from some nodes, the influence of the target reactive compensation node on the nodes can be ignored, so that U is addedsThe threshold value is set as a threshold value, and the threshold value can be specifically adjusted according to actual needs, and one feasible value is 0.1. When K isQiAny value of Δ ujLess than UsWhen, will be Δ ujIs set to 0.
And step 107, determining a reactive power sensitivity matrix according to the sensitivities of all target reactive compensation nodes.
Specifically, the reactive power sensitivity matrix is determined by the following method:
in the formula (10), AQIs a reactive power sensitivity matrix; kQiThe sensitivity of the ith target reactive compensation node.
And step 108, sequentially determining the sensitivity of the target power generation node according to the Jacobian matrix and a preset unit voltage value.
Specifically, one column is added to the rightmost side of the Jacobian matrix, one row is added to the bottommost side of the Jacobian matrix, and the corresponding Jacobian matrix is as follows:
in formula (11), J' is a Jacobian matrix; the matrix H' is an (N-1) × (N-1) matrix; the matrix R' is an (N-1) × (N-M) matrix; k' is an (N-M) × (N-1) matrix; l' is an (N-M) × (N-M) matrix.
The sensitivity of the target power generation node is a voltage change value corresponding to other nodes caused by increasing or decreasing a preset unit voltage value for the target power generation node. The Jacobian matrix comprises the voltage change values of the power generation nodes and the corresponding relation of the voltage change values of other nodes.
Since the voltage change value caused by the voltage change amount of the target power generation node to other nodes is difficult to directly obtain, the target power generation node is used as a special target reactive power compensation node, and therefore, the preset unit voltage value is converted into a special unit reactive power value.
Let 'Q' be [0 Δ QN-M]Wherein, the reactive power change values of N-M-1 target power generation nodes before the delta Q' are all 0, and the reactive power change value of the N-M-1 target power generation node is delta QN-MWhen Δ P is 0, the power correction equation at this time is:
according to the formula (12), the sensitivity of the ith target power generation node is obtained as follows:
since the influence of the target generation node on other nodes is limited, the maximum value in the formula (13) is obtained, and the other values are set to 0.
And step 109, determining a voltage sensitivity matrix according to the sensitivities of all the target power generation nodes.
Specifically, the voltage sensitivity matrix is as follows:
in formula (14), AUIs a voltage sensitivity matrix; kUiThe sensitivity of the ith target power generation node.
And step 110, determining an overall sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix.
Specifically, the overall sensitivity matrix is confirmed by the following method:
A＝[AQ AU]formula (15)
In formula (15), a is an overall sensitivity matrix; a. theQIs a reactive power sensitivity matrix; a. theUIs a voltage sensitivity matrix.
And step 111, determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted.
And the adjusting vector comprises a reactive power adjusting value corresponding to the target reactive compensation node and a voltage adjusting value corresponding to the target power generation node. The reactive power adjustment value is a reactive power value which needs to be increased or decreased by the target reactive compensation node; the voltage adjustment value is a voltage value that the target power generation node itself needs to be increased or decreased.
Specifically, the adjustment vector is determined by the following method:
AΔX＝ΔUbformula (16)
In the formula (16), Δ X is an adjustment vector; a is an overall sensitivity matrix; delta UbIs the voltage vector to be adjusted.
Specifically, the adjustment vector is determined by using a least square method according to the overall sensitivity matrix and the voltage vector to be adjusted. The method for solving the adjustment vector by using the least square method is as follows:
ΔX＝(ATA)-1ATΔUbformula (17)
In the formula (17), Δ X is an adjustment vector; a is an overall sensitivity matrix; delta UbIs the voltage vector to be adjusted.
And 112, correspondingly adjusting the reactive power value of the target reactive power compensation node according to the reactive power adjustment value corresponding to the target reactive power compensation node in the adjustment vector.
According to equation (17), solving results in Δ X ═ Δ qr,1 … Δqr,N1,Δur,1 … Δur,N2]Wherein, Δ qr,i(i＝1,2,…N1) And adjusting the reactive power value corresponding to the target reactive compensation node in the adjustment vector.
And 113, correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector.
Similarly, Δ X ═ Δ qr,1 … Δqr,N1,Δur,1 … Δur,N2]Wherein, Δ ur,i(i＝1,2,…N2) To adjust the voltage value of the target power generation node in the vector.
After the steps are executed, determining a second voltage difference value of each node according to the first voltage value of each node and the third voltage value of each node in the power system; and the third voltage value of the node is the voltage value of each node after the target reactive compensation node and the target power generation node are adjusted.
Judging whether a second out-of-limit node with a second voltage difference value larger than a preset voltage difference threshold exists in each node or not; and if the second out-of-limit nodes exist, returning to the step of determining the voltage vector to be adjusted according to the second voltage difference values of all the second out-of-limit nodes until no second out-of-limit node exists in each node.
If the out-of-limit nodes exist all the time in the implementation process of the embodiment of the application, if the adjustment times of the target reactive compensation node and the target power generation node reach the preset times, the voltage adjustment is not performed on each node.
Step 114, keeping the second voltage value of each node at present.
The method provided by the application utilizes a matrix method to determine the corresponding adjustment amount of each node needing to be adjusted in the power system in each adjustment process, so that a large amount of manual analysis is avoided, the efficiency is improved, and the adjustment accuracy is ensured.
The following are embodiments of the apparatus of the present application that may be used to perform embodiments of the method of the present application. For details which are not disclosed in the embodiments of the apparatus of the present application, reference is made to the embodiments of the method of the present application.
Fig. 2 schematically illustrates a structural diagram of an apparatus for adjusting a node voltage in an electric power system according to an embodiment of the present application. As shown in fig. 2, the apparatus has a function of implementing the method for adjusting the node voltage in the power system, and the function may be implemented by hardware, or by hardware executing corresponding software. The apparatus may include: a determination module 201, a judgment module 202, an adjustment module 203, and a holding module 204.
The determining module 201 is configured to determine a first voltage difference value of each node according to a first voltage value of each node in the power system before power flow adjustment and a second voltage value of each node after power flow adjustment.
The determining module 202 is configured to determine whether a first out-of-limit node exists in each node, where the first voltage difference is greater than a preset voltage difference threshold.
The determining module 201 is further configured to determine a voltage vector to be adjusted according to first voltage difference values of all first out-of-limit nodes if the first out-of-limit nodes exist; determining a target reactive compensation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined reactive compensation node in the power system; the target reactive compensation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the reactive power value of the target reactive compensation node; determining a target power generation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined power generation node in the power system; the target power generation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the voltage value of the target power generation node; sequentially determining the sensitivity of the target reactive compensation node according to the Jacobian matrix and a preset unit reactive power value; the sensitivity of the target reactive compensation node is that the target reactive compensation node increases or decreases a preset unit reactive power value to cause voltage change values corresponding to other nodes; the Jacobian matrix comprises a reactive power change value of a reactive compensation node and a corresponding relation with voltage change values of other nodes; and determining a reactive power sensitivity matrix according to the sensitivities of all target reactive compensation nodes.
The determining module 201 is further configured to sequentially determine the sensitivity of the target power generation node according to the jacobian matrix and a preset unit voltage value; the sensitivity of the target power generation node is that the preset unit voltage value is increased or decreased by the target power generation node, so that voltage change values corresponding to other nodes are caused; the Jacobian matrix comprises the voltage change values of the power generation nodes and the corresponding relation of the voltage change values of other nodes; determining a voltage sensitivity matrix according to the sensitivities of all target power generation nodes; determining an integral sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix; determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted; the adjustment vector comprises a reactive power adjustment value corresponding to the target reactive compensation node and a voltage adjustment value corresponding to the target power generation node; the reactive power adjustment value is a reactive power value which needs to be increased or decreased by the target reactive compensation node; the voltage adjustment value is a voltage value that the target power generation node itself needs to be increased or decreased.
The adjusting module 203 is configured to correspondingly adjust the reactive power value of the target reactive power compensation node according to the reactive power adjustment value corresponding to the target reactive power compensation node in the adjustment vector; and correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector.
With reference to the second aspect, in an implementation manner of the second aspect, the determining module 201 is further configured to:
determining a second voltage difference value of each node according to the first voltage value of each node and the third voltage value of each node in the power system; and the third voltage value of the node is the voltage value of each node after the target reactive compensation node and the target power generation node are adjusted.
The determining module 202 is further configured to determine whether a second out-of-limit node exists in each node, where the second voltage difference is greater than the preset voltage difference threshold.
The determining module 201 is further configured to, if there is a second out-of-limit node, return to the step of determining the voltage vector to be adjusted according to the second voltage difference values of all the second out-of-limit nodes until there is no second out-of-limit node in each node.
With reference to the second aspect, in an implementation manner of the second aspect, the apparatus further includes:
and a holding module 204, configured to hold the current second voltage value of each node if the first out-of-limit node does not exist in each node.
With reference to the second aspect, in an implementation manner of the second aspect, the determining module 201 is specifically configured to:
and determining the vector to be adjusted by using a least square method according to the overall sensitivity matrix and the voltage vector to be adjusted.
The method provided by the application utilizes a matrix method to determine the corresponding adjustment amount of each node needing to be adjusted in the power system in each adjustment process, so that a large amount of manual analysis is avoided, the efficiency is improved, and the adjustment accuracy is ensured.
The invention is operational with numerous general purpose or special purpose computing system environments or configurations. For example: personal computers, server computers, hand-held or portable devices, tablet-type devices, multiprocessor systems, microprocessor-based systems, set top boxes, programmable consumer electronics, network PCs, minicomputers, mainframe computers, distributed computing environments that include any of the above systems or devices, and the like.
The invention may be described in the general context of computer-executable instructions, such as program modules, being executed by a computer. Generally, program modules include routines, programs, objects, components, data structures, etc. that perform particular tasks or implement particular abstract data types. The invention may also be practiced in distributed computing environments where tasks are performed by remote processing devices that are linked through a communications network. In a distributed computing environment, program modules may be located in both local and remote computer storage media including memory storage devices.
Other embodiments of the invention will be apparent to those skilled in the art from consideration of the specification and practice of the invention disclosed herein. This invention is intended to cover any variations, uses, or adaptations of the invention following, in general, the principles of the invention and including such departures from the present disclosure as come within known or customary practice within the art to which the invention pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the invention being indicated by the following claims.
It will be understood that the invention is not limited to the precise arrangements described above and shown in the drawings and that various modifications and changes may be made without departing from the scope thereof. The scope of the invention is limited only by the appended claims.
Claims (8)
1. A method for adjusting node voltage in an electrical power system, the method comprising:
determining a first voltage difference value of each node according to a first voltage value of each node in the power system before power flow adjustment and a second voltage value of each node after power flow adjustment;
judging whether a first out-of-limit node with the first voltage difference value larger than a preset voltage difference threshold exists in each node, and if the first out-of-limit node exists, determining a voltage vector to be adjusted according to the first voltage difference values of all the first out-of-limit nodes;
determining a target reactive compensation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined reactive compensation node in the power system; the target reactive compensation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the reactive power value of the target reactive compensation node;
determining a target power generation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined power generation node in the power system; the target power generation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the voltage value of the target power generation node;
sequentially determining the sensitivity of the target reactive power compensation node according to the Jacobian matrix and a preset unit reactive power value; the sensitivity of the target reactive power compensation node is that the target reactive power compensation node increases or decreases the preset unit reactive power value to cause voltage change values corresponding to other nodes; the Jacobian matrix comprises a reactive power change value of a reactive compensation node and a corresponding relation with voltage change values of other nodes;
determining a reactive power sensitivity matrix according to the sensitivities of all target reactive compensation nodes;
sequentially determining the sensitivity of a target power generation node according to the Jacobian matrix and a preset unit voltage value; the sensitivity of the target power generation node is that the target power generation node increases or decreases a preset unit voltage value to cause voltage change values corresponding to other nodes; the Jacobian matrix after the dimensionality change comprises a voltage change value of the power generation node and a corresponding relation with voltage change values of other nodes;
determining a voltage sensitivity matrix according to the sensitivities of all target power generation nodes;
determining an overall sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix;
determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted; the adjustment vector comprises a reactive power adjustment value corresponding to the target reactive compensation node and a voltage adjustment value corresponding to the target power generation node; the reactive power adjustment value is a reactive power value which needs to be increased or decreased by the target reactive compensation node; the voltage adjustment value is a voltage value which needs to be increased or decreased by the target power generation node;
correspondingly adjusting the reactive power value of the target reactive power compensation node according to the reactive power adjustment value corresponding to the target reactive power compensation node in the adjustment vector;
and correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector.
2. The method according to claim 1, wherein the reactive power value of the target reactive power compensation node is correspondingly adjusted according to the reactive power adjustment value corresponding to the target reactive power compensation node in the adjustment vector; after correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector, the method further includes:
determining a second voltage difference value of each node according to the first voltage value of each node in the power system and the third voltage value of each node; the third voltage value of the node is the voltage value of each node after the target reactive compensation node and the target power generation node are adjusted;
judging whether a second out-of-limit node with a second voltage difference value larger than the preset voltage difference threshold exists in each node or not; and if the second out-of-limit nodes exist, returning to the step of determining the voltage vector to be adjusted according to the second voltage difference values of all the second out-of-limit nodes until the second out-of-limit nodes do not exist in each node.
3. The method of claim 1, further comprising:
and if the first out-of-limit node does not exist in each node, keeping the second voltage value of each current node.
4. The method of claim 1, wherein determining an adjustment vector based on the overall sensitivity matrix and the voltage vector to be adjusted comprises:
and determining the vector to be adjusted by utilizing a least square method according to the overall sensitivity matrix and the voltage vector to be adjusted.
5. An apparatus for regulating node voltage in an electric power system, the apparatus comprising:
the determining module is used for determining a first voltage difference value of each node according to a first voltage value of each node in the power system before power flow adjustment and a second voltage value of each node after power flow adjustment;
the judging module is used for judging whether a first out-of-limit node with the first voltage difference value larger than a preset voltage difference threshold exists in each node;
the determining module is further configured to determine a voltage vector to be adjusted according to first voltage difference values of all the first out-of-limit nodes if the first out-of-limit nodes exist; determining a target reactive compensation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined reactive compensation node in the power system; the target reactive compensation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the reactive power value of the target reactive compensation node; determining a target power generation node corresponding to the first out-of-limit node according to the position of the first out-of-limit node in the power system and the position of a predetermined power generation node in the power system; the target power generation node is a node which is determined in advance and can adjust the voltage values of other nodes by increasing or decreasing the voltage value of the target power generation node; sequentially determining the sensitivity of the target reactive power compensation node according to the Jacobian matrix and a preset unit reactive power value; the sensitivity of the target reactive power compensation node is that the target reactive power compensation node increases or decreases the preset unit reactive power value to cause voltage change values corresponding to other nodes; the Jacobian matrix comprises a reactive power change value of a reactive compensation node and a corresponding relation with voltage change values of other nodes; determining a reactive power sensitivity matrix according to the sensitivities of all target reactive compensation nodes;
the determining module is further used for sequentially determining the sensitivity of the target power generation node according to the Jacobian matrix and a preset unit voltage value; the sensitivity of the target power generation node is that the target power generation node increases or decreases a preset unit voltage value to cause voltage change values corresponding to other nodes; the Jacobian matrix after the dimensionality change comprises a voltage change value of the power generation node and a corresponding relation with voltage change values of other nodes; determining a voltage sensitivity matrix according to the sensitivities of all target power generation nodes; determining an overall sensitivity matrix according to the reactive power sensitivity matrix and the voltage sensitivity matrix; determining an adjustment vector according to the overall sensitivity matrix and the voltage vector to be adjusted; the adjustment vector comprises a reactive power adjustment value corresponding to the target reactive compensation node and a voltage adjustment value corresponding to the target power generation node; the reactive power adjustment value is a reactive power value which needs to be increased or decreased by the target reactive compensation node; the voltage adjustment value is a voltage value which needs to be increased or decreased by the target power generation node;
the adjusting module is used for correspondingly adjusting the reactive power value of the target reactive power compensation node according to the reactive power adjusting value corresponding to the target reactive power compensation node in the adjusting vector; and correspondingly adjusting the voltage value of the target power generation node according to the voltage adjustment value corresponding to the target power generation node in the adjustment vector.
6. The apparatus of claim 1, wherein the determining module is further configured to:
determining a second voltage difference value of each node according to the first voltage value of each node in the power system and the third voltage value of each node; the third voltage value of the node is the voltage value of each node after the target reactive compensation node and the target power generation node are adjusted;
the judging module is further configured to judge whether a second out-of-limit node exists in each node, where a second voltage difference value is greater than the preset voltage difference threshold;
the determining module is further configured to, if the second out-of-limit node exists, return to the step of determining the voltage vector to be adjusted according to the second voltage difference values of all the second out-of-limit nodes until the second out-of-limit node does not exist in each node.
7. The apparatus of claim 1, further comprising:
and the holding module is used for holding the second voltage value of each current node if the first out-of-limit node does not exist in each node.
8. The apparatus of claim 1, wherein the determining module is specifically configured to:
and determining the vector to be adjusted by utilizing a least square method according to the overall sensitivity matrix and the voltage vector to be adjusted.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011136615.9A CN112260288B (en) | 2020-10-22 | 2020-10-22 | Method and device for adjusting node voltage in power system |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011136615.9A CN112260288B (en) | 2020-10-22 | 2020-10-22 | Method and device for adjusting node voltage in power system |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN112260288A true CN112260288A (en) | 2021-01-22 |
| CN112260288B CN112260288B (en) | 2023-05-23 |
Family
ID=74263869
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202011136615.9A Active CN112260288B (en) | 2020-10-22 | 2020-10-22 | Method and device for adjusting node voltage in power system |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN112260288B (en) |
Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4868410A (en) * | 1986-09-10 | 1989-09-19 | Mitsubishi Denki Kabushiki Kaisha | System of load flow calculation for electric power system |
| CN102545230A (en) * | 2012-01-10 | 2012-07-04 | 四川省电力公司 | Voltage out-of-limit adjusting method |
| CN106356867A (en) * | 2016-09-27 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Node reactive voltage sensitivity determination method |
| JP2017028915A (en) * | 2015-07-24 | 2017-02-02 | 富士電機株式会社 | Arrangement calculation apparatus for power storage device, arrangement calculation method for power storage device, arrangement calculation system for power storage device, and program |
| CN106410812A (en) * | 2016-08-30 | 2017-02-15 | 上海交通大学 | Network voltage out-of-limit adjusting method for use after access of ultrahigh voltage |
| CN108376984A (en) * | 2018-01-25 | 2018-08-07 | 云南电网有限责任公司 | A kind of Electric Power System Node Voltage automatic adjusting method |
| CN109217295A (en) * | 2018-09-20 | 2019-01-15 | 吉林大学 | The trend sensitivity computing method and computer installation of prevention system overload |
| CN109617080A (en) * | 2018-12-28 | 2019-04-12 | 大连海事大学 | Rectangular coordinate Newton load flow calculation method based on improved Jacobian matrix |
| CN110233484A (en) * | 2019-06-12 | 2019-09-13 | 国网青海省电力公司 | Consider the multi-objective reactive optimization configuration method of compensation benefit |
| CN111049144A (en) * | 2019-12-23 | 2020-04-21 | 东南大学 | Active power distribution network load flow calculation PV node processing method based on constant change rate matrix |
| CN111064179A (en) * | 2019-10-22 | 2020-04-24 | 国网山东省电力公司电力科学研究院 | Comprehensive control method and system for ensuring voltage safety in power recovery stage of multi-feed-in direct current system |
| CN111211538A (en) * | 2020-01-15 | 2020-05-29 | 广东电网有限责任公司 | Method for realizing protection constant value setting through power distribution network line diagram |
-
2020
- 2020-10-22 CN CN202011136615.9A patent/CN112260288B/en active Active
Patent Citations (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US4868410A (en) * | 1986-09-10 | 1989-09-19 | Mitsubishi Denki Kabushiki Kaisha | System of load flow calculation for electric power system |
| CN102545230A (en) * | 2012-01-10 | 2012-07-04 | 四川省电力公司 | Voltage out-of-limit adjusting method |
| JP2017028915A (en) * | 2015-07-24 | 2017-02-02 | 富士電機株式会社 | Arrangement calculation apparatus for power storage device, arrangement calculation method for power storage device, arrangement calculation system for power storage device, and program |
| CN106410812A (en) * | 2016-08-30 | 2017-02-15 | 上海交通大学 | Network voltage out-of-limit adjusting method for use after access of ultrahigh voltage |
| CN106356867A (en) * | 2016-09-27 | 2017-01-25 | 南方电网科学研究院有限责任公司 | Node reactive voltage sensitivity determination method |
| CN108376984A (en) * | 2018-01-25 | 2018-08-07 | 云南电网有限责任公司 | A kind of Electric Power System Node Voltage automatic adjusting method |
| CN109217295A (en) * | 2018-09-20 | 2019-01-15 | 吉林大学 | The trend sensitivity computing method and computer installation of prevention system overload |
| CN109617080A (en) * | 2018-12-28 | 2019-04-12 | 大连海事大学 | Rectangular coordinate Newton load flow calculation method based on improved Jacobian matrix |
| CN110233484A (en) * | 2019-06-12 | 2019-09-13 | 国网青海省电力公司 | Consider the multi-objective reactive optimization configuration method of compensation benefit |
| CN111064179A (en) * | 2019-10-22 | 2020-04-24 | 国网山东省电力公司电力科学研究院 | Comprehensive control method and system for ensuring voltage safety in power recovery stage of multi-feed-in direct current system |
| CN111049144A (en) * | 2019-12-23 | 2020-04-21 | 东南大学 | Active power distribution network load flow calculation PV node processing method based on constant change rate matrix |
| CN111211538A (en) * | 2020-01-15 | 2020-05-29 | 广东电网有限责任公司 | Method for realizing protection constant value setting through power distribution network line diagram |
Non-Patent Citations (2)
| Title |
|---|
| 段建民;张焰;王承民;孙建生;周坚;曹路;蒋逸静: "提高大规模电力系统静态电压稳定性的无功补偿方法", JOURNAL OF SHANGHAI JIAOTONG UNIVERITY * |
| 邵宜祥;陈宁;朱凌志;王伟: "基于降阶雅可比矩阵的并网风电场局部静态电压支撑能力评估", POWER SYSTEM TECHNOLOGY * |
Also Published As
| Publication number | Publication date |
|---|---|
| CN112260288B (en) | 2023-05-23 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| Ajjarapu | Computational techniques for voltage stability assessment and control | |
| Münz et al. | Sensor and Actuator Placement for Linear Systems Based on $ H_ {2} $ and $ H_ {\infty} $ Optimization | |
| WO2017104302A1 (en) | Voltage stability monitoring device and method | |
| CN105305411A (en) | System and method for a load anticipation feature and its tuning method for a generating set | |
| CN105305439A (en) | Probability dynamic power flow computing method and system in view of input variable correlation | |
| Razmi et al. | Steady state voltage stability with AVR voltage constraints | |
| Hamzi et al. | Local modal participation analysis of nonlinear systems using Poincaré linearization | |
| Adegas et al. | Reduced-order LPV model of flexible wind turbines from high fidelity aeroelastic codes | |
| Cruz et al. | Algorithm development for power system contingency screening and ranking using voltage-reactive power performance index | |
| CN117242665A (en) | Power system model calibration using measurement data | |
| CN110994643B (en) | Control parameter adjusting method and device for speed regulator of hydroelectric generating set | |
| CN112260288B (en) | Method and device for adjusting node voltage in power system | |
| Varshney et al. | A parallel computing approach for integrated security assessment of power system | |
| Duraipandy et al. | On-line voltage stability assessment using least squares support vector machine with reduced input features | |
| Spudić et al. | Fast coordinated model predictive control of large-scale distributed systems with single coupling constraint | |
| Freitas et al. | Conditioning step on the initial estimate when solving ill-conditioned power flow problems | |
| Ayuev et al. | Models of closest marginal states of power systems in p-norms | |
| CN113221064B (en) | Model processing method, device, computer equipment and storage medium | |
| CN114421483A (en) | Analytic probabilistic power flow calculation method, device and storage medium | |
| Đukić et al. | A new approach to physics-based reduction of power system dynamic models | |
| Duraipandy et al. | Extreme learning machine approach for on-line voltage stability assessment | |
| CN110350507B (en) | Method and device for determining equivalent capacitance of direct-current microgrid and computer-readable storage medium | |
| Song et al. | Determination of load shedding for power-flow solvability using outage-continuation power flow (OCPF) | |
| Ma et al. | Quantifying the potential benefits of constrained control for a large-scale system | |
| CN113794198A (en) | Method, device, terminal and storage medium for suppressing broadband oscillation |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |