Method, device, medium, and terminal for determining node frequency change rate

Abstract

The present application discloses a method and device, medium, and terminal for determining the node frequency change rate, which relates to the technical field of power system frequency regulation. The main purpose is to solve the problem that the existing system frequency regulation cannot meet the system frequency regulation requirements of the dual-high power system. The method comprises: when a frequency disturbance is detected in the generator unit line, obtaining the disturbance node voltage change value and current change value, impedance distribution parameters, generator inertia values of each generator, and the first transmission line length value between the generators; calculating the node disturbed power value at the target node based on the branch current change value and node impedance value and disturbance node voltage change value at the target node; determining the node inertia value at the target node based on the node inertia distribution model and the second transmission line length value from the target node to each generator; determining the node frequency change rate at the target node based on the node disturbed power value and the node inertia value.

Description

Technical Field

[0001] The present application relates to the technical field of power system frequency regulation, and in particular to a method, device, medium, and terminal for determining a node frequency change rate. Background Art

[0002] With the integration of a high proportion of renewable energy and power electronics, the traditional power system, dominated by synchronous generators, is gradually transforming into a new energy power system with a high degree of power electronics in the power source, grid, load, and storage links. This is referred to as a "double-high power system," meaning a power system with a high proportion of renewable energy and power electronics. To ensure frequency security in this double-high power system, system frequency regulation is necessary based on the frequency variation characteristics of the system.

[0003] In the prior art, the disturbance power is usually distributed to each synchronous generator node according to the synchronous power coefficient to obtain the disturbance power value at the generator end. Then, the swing equation is used to calculate the generator end frequency change rate based on the known disturbance power value at the generator end and the generator's own inertia, so as to adjust the system frequency according to the generator end frequency change rate.

[0004] However, in the dual-high power system, due to the changes in the dynamic characteristics of the system frequency, the frequency dynamic characteristics of each node are obviously heterogeneous. The system frequency adjustment based only on the frequency change rate of the generator end and the frequency change rate of the disturbance node cannot meet the system frequency adjustment requirements of the dual-high power system, resulting in the inability to ensure the system frequency security of the dual-high power system. Summary of the Invention

[0005] In view of this, the present application provides a method and device, medium, and terminal for determining the node frequency change rate. The main purpose is to solve the problem that the existing system frequency adjustment based on the frequency change rate of the generator end and the frequency change rate of the disturbance node cannot meet the system frequency adjustment requirements of the dual-high power system, resulting in the inability to ensure the system frequency security of the dual-high power system.

[0006] According to one aspect of the present application, a method for determining a node frequency change rate is provided, comprising:

[0007] When a frequency disturbance is detected in the generator set circuit, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators are obtained;

[0008] Calculating a node disturbed power value at the target node based on a branch current change value and a node impedance value at the target node and a disturbance node voltage change value, wherein the node impedance value is determined based on the impedance distribution parameter, and the branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter;

[0009] determining a node inertia value at the target node based on a node inertia distribution model of the generator set line and according to a second transmission line length value from the target node to each of the generators, wherein the node inertia distribution model is pre-constructed based on the inertia values of each of the generators and the first transmission line length value;

[0010] The node frequency change rate at the target node is determined according to the node disturbed power value and the node inertia value.

[0011] Preferably, calculating the node disturbed power value at the target node according to the branch current change value and the node impedance value at the target node and the disturbance node voltage change value includes:

[0012] Based on the impedance distribution parameter, the disturbance node current change value is distributed to each branch line included in the generator set line to obtain a branch current change value of each branch line;

[0013] Based on the impedance distribution parameter, obtaining each impedance value between the disturbance node and the target node, and determining the sum of each impedance value as the node impedance value at the target node;

[0014] Determine the product of the node impedance value and the branch current change value of the branch line where the target node is located as the disturbance power propagation voltage drop value at the target node;

[0015] Determine the difference between the disturbance node voltage change value and the disturbance power propagation voltage drop value as the node voltage change value at the target node;

[0016] The product of the node voltage change value and the branch current change value is determined as the node disturbed power value at the target node.

[0017] Preferably, the distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter to obtain the branch current change value of each branch line includes:

[0018] Calculating the branch impedance value of each branch line included in the generator set circuit based on the impedance distribution parameter, and calculating the proportion of each branch impedance value to the total impedance value of the generator set circuit;

[0019] Taking each of the branch routes as a target branch route one by one;

[0020] Determine the product of the sum of the proportions corresponding to other branch lines except the target branch line and the disturbance node current change value as the branch current change value of the target branch line;

[0021] The branch current change value of each branch line is obtained.

[0022] Preferably, before determining the node inertia value at the target node based on the node inertia distribution model of the generator set line and according to the second transmission line length value from the target node to each of the generators, the method further comprises:

[0023] Constructing corresponding sub-node inertia distribution models based on the Gaussian distribution function according to the generator inertia value of each generator and the length value of the first transmission line;

[0024] The sub-node inertia distribution models of the generators in the running state are added together to obtain the node inertia distribution model of the generator set circuit.

[0025] Preferably, determining the node frequency change rate at the target node according to the node disturbed power value and the node inertia value includes:

[0026] The quotient of the node disturbed power value and the node inertia value of a preset multiple is determined as the node frequency change rate at the target node.

[0027] Preferably, the method further comprises:

[0028] Selecting multiple points in the generator set circuit as preset nodes, and calculating the node frequency change rate at each of the preset nodes;

[0029] The system frequency of the generator set circuit is adjusted according to the frequency change rate of each node.

[0030] Preferably, the sub-node inertia distribution model is expressed as the following formula:

[0031]

[0032] Among them, H m,i (x i ) represents the generator G m At node xi The nodal inertia at a m,i Represents the parameter, H m Represents the generator G m The generator inertia value, c m,i Indicates the first transmission line length value.

[0033] According to another aspect of the present application, a device for determining a node frequency change rate is provided, comprising:

[0034] a data acquisition module for acquiring, when a frequency disturbance is detected in a generator set circuit, a disturbance node voltage change value and a disturbance node current change value at a disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators;

[0035] a node disturbed power value calculation module, configured to calculate the node disturbed power value at the target node based on the branch current change value and the node impedance value at the target node, and the disturbance node voltage change value, wherein the node impedance value is determined based on the impedance distribution parameter, and the branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter;

[0036] a node inertia value determining module, configured to determine the node inertia value at the target node based on a node inertia distribution model of the generator set line and according to a second transmission line length value from the target node to each of the generators, wherein the node inertia distribution model is pre-constructed based on the inertia values of each of the generators and the first transmission line length value;

[0037] The node frequency change rate determination module is used to determine the node frequency change rate at the target node according to the node disturbed power value and the node inertia value.

[0038] Preferably, the node disturbed power value calculation module is used to:

[0039] Based on the impedance distribution parameter, the disturbance node current change value is distributed to each branch line included in the generator set line to obtain a branch current change value of each branch line;

[0040] Based on the impedance distribution parameter, obtaining each impedance value between the disturbance node and the target node, and determining the sum of each impedance value as the node impedance value at the target node;

[0041] Determine the product of the node impedance value and the branch current change value of the branch line where the target node is located as the disturbance power propagation voltage drop value at the target node;

[0042] Determine the difference between the disturbance node voltage change value and the disturbance power propagation voltage drop value as the node voltage change value at the target node;

[0043] The product of the node voltage change value and the branch current change value is determined as the node disturbed power value at the target node.

[0044] Preferably, the node disturbed power value calculation module is further used to:

[0045] Calculating the branch impedance value of each branch line included in the generator set circuit based on the impedance distribution parameter, and calculating the proportion of each branch impedance value to the total impedance value of the generator set circuit;

[0046] Taking each of the branch routes as a target branch route one by one;

[0047] Determine the product of the sum of the proportions corresponding to other branch lines except the target branch line and the disturbance node current change value as the branch current change value of the target branch line;

[0048] The branch current change value of each branch line is obtained.

[0049] Preferably, before the node inertia value determination module, the device further includes a node inertia distribution model construction module, which is used to:

[0050] Constructing corresponding sub-node inertia distribution models based on the Gaussian distribution function according to the generator inertia value of each generator and the length value of the first transmission line;

[0051] The sub-node inertia distribution models of the generators in the running state are added together to obtain the node inertia distribution model of the generator set circuit.

[0052] Preferably, the node frequency change rate determination module is used to:

[0053] The quotient of the node disturbed power value and the node inertia value of a preset multiple is determined as the node frequency change rate at the target node.

[0054] Preferably, the device further includes a frequency adjustment module, configured to:

[0055] Selecting multiple points in the generator set circuit as preset nodes, and calculating the node frequency change rate at each of the preset nodes;

[0056] The system frequency of the generator set circuit is adjusted according to the frequency change rate of each node.

[0057] Preferably, the sub-node inertia distribution model is expressed as the following formula:

[0058]

[0059] Among them, H m,i (x i ) represents the generator G m At node x i The nodal inertia at a m,i Represents the parameter, H m Represents the generator G m The generator inertia value, c m,i Indicates the first transmission line length value.

[0060] According to another aspect of the present application, a storage medium is provided, in which at least one executable instruction is stored. The executable instruction enables a processor to execute operations corresponding to the above-mentioned method for determining the node frequency change rate.

[0061] According to another aspect of the present application, there is provided a terminal, comprising: a processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other via the communication bus;

[0062] The memory is used to store at least one executable instruction, and the executable instruction enables the processor to execute an operation corresponding to the above-mentioned method for determining the node frequency change rate.

[0063] By means of the above technical solution, the technical solution provided by the embodiment of the present application has at least the following advantages:

[0064] The present application provides a method and device, medium, and terminal for determining the node frequency change rate. First, when a frequency disturbance is detected in a generator set line, the disturbance node voltage change value and the disturbance node current change value at the disturbance node, the impedance distribution parameter of the generator set line, the generator inertia value of each generator in the generator set line, and the first transmission line length value between the generators are obtained; secondly, according to the branch current change value and the node impedance value at the target node and the disturbance node voltage change value, the node disturbed power value at the target node is calculated. The node impedance value is determined according to the impedance distribution parameter. The branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter; thirdly, based on the node inertia distribution model of the generator set line, the node inertia value at the target node is determined according to the second transmission line length value from the target node to each of the generators, and the node inertia distribution model is pre-constructed according to the inertia values of each of the generators and the first transmission line length value; finally, the node frequency change rate at the target node is determined according to the node disturbed power value and the node inertia value. Compared with the prior art, the embodiment of the present application distributes the disturbance node current change value to each branch line based on the impedance distribution parameter to obtain the branch current change value, and calculates the node disturbed power value of each node in combination with the disturbance node voltage change value. Since it fully considers the loss of the disturbance power on the line and the difference in the impact of the disturbance on each node, it is more suitable for the characteristics of the dual-high power system; further, the node inertia value is calculated using a pre-established node inertia distribution model. Since the model describes the distribution of the node inertia value in the line with the node position, the node inertia value of any node can be obtained according to the node position information, and then the node frequency change rate at any node can be obtained to meet the demand for system frequency regulation according to the node frequency change rate of any node, meet the system frequency regulation demand of the dual-high power system, and effectively improve the system frequency safety of the dual-high power system.

[0065] The above description is only an overview of the technical solution of the present application. In order to more clearly understand the technical means of the present application, it can be implemented in accordance with the contents of the specification. In order to make the above and other purposes, features and advantages of the present application more obvious and easy to understand, the specific implementation methods of the present application are listed below. BRIEF DESCRIPTION OF THE DRAWINGS

[0066] Various other advantages and benefits will become apparent to those skilled in the art upon reading the detailed description of the preferred embodiment below. The accompanying drawings are for illustration purposes only and are not to be considered as limiting the present application. The same reference symbols are used throughout the drawings to represent the same components. In the drawings:

[0067] Figure 1 A flow chart of a method for determining a node frequency change rate provided by an embodiment of the present application is shown;

[0068] Figure 2 A diagram of a unit-line parameter model provided in an embodiment of the present application is shown;

[0069] Figure 3 A flow chart of another method for determining a node frequency change rate provided by an embodiment of the present application is shown;

[0070] Figure 4 shows a node inertia distribution model curve of a dual-motor system provided by an embodiment of the present application;

[0071] Figure 5 A block diagram of a device for determining a node frequency change rate provided by an embodiment of the present application is shown;

[0072] Figure 6 A schematic diagram of the structure of a terminal provided in an embodiment of the present application is shown. DETAILED DESCRIPTION

[0073] Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. Although exemplary embodiments of the present disclosure are shown in the accompanying drawings, it should be understood that the present disclosure can be implemented in various forms and should not be limited by the embodiments set forth herein. Rather, these embodiments are provided to enable a more thorough understanding of the present disclosure and to fully convey the scope of the present disclosure to those skilled in the art.

[0074] At the same time, it should be understood that for the convenience of description, the sizes of the various parts shown in the drawings are not drawn according to the actual proportional relationship.

[0075] The following description of at least one exemplary embodiment is merely illustrative in nature and is in no way intended to limit the present disclosure, its application, or uses.

[0076] Technologies, methods, and equipment known to ordinary technicians in the relevant art may not be discussed in detail, but where appropriate, the technologies, methods, and equipment should be considered part of the specification.

[0077] It should be noted that like reference numerals and letters refer to like items in the following figures, and therefore, once an item is defined in one figure, it need not be further discussed in subsequent figures.

[0078] Embodiments of the present application may be applied to a computer system / server that is operable with numerous other general-purpose or special-purpose computing system environments or configurations. Examples of well-known computing systems, environments, and / or configurations suitable for use with the computer system / server include, but are not limited to, personal computer systems, server computer systems, thin clients, thick clients, handheld or laptop devices, microprocessor-based systems, set-top boxes, programmable consumer electronics, network personal computers, minicomputer systems, mainframe computer systems, and distributed cloud computing technology environments including any of the foregoing.

[0079] Computer systems / servers may be described in the general context of computer system-executable instructions, such as program modules, executed by a computer system. Generally, program modules may include routines, programs, objects, components, logic, data structures, and the like, that perform specific tasks or implement specific abstract data types. Computer systems / servers may be implemented in a distributed cloud computing environment where tasks are performed by remote processing devices linked through a communications network. In a distributed cloud computing environment, program modules may be located on local or remote computer system storage media, including storage devices.

[0080] The present application embodiment provides a method for determining the node frequency change rate, such as Figure 1 As shown, the method includes:

[0081] 101. When a frequency disturbance is detected in a generator set line, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set line, a generator inertia value of each generator in the generator set line, and a first transmission line length value between the generators are obtained.

[0082] Among them, the disturbance node voltage change value is used to characterize the voltage change value caused by the frequency disturbance at the disturbance node, which can be directly measured using a measuring instrument; the disturbance node current change value is used to characterize the current change value caused by the frequency disturbance at the disturbance node, which can be directly measured using a measuring instrument; the impedance distribution parameter is used to record the impedance distribution in the generator unit line, which can be recorded using the unit-line parameter model diagram, such as Figure 2 As shown in the figure, X′ d1 、X T1 、X 2k 、X k3 、X T2 , X′ d2Both represent impedance; the generator inertia value is an inherent parameter of the generator and can be directly obtained; the first transmission line length value is used to represent the length of the transmission line between any two generators. In this embodiment of the present application, the current execution end can be a system frequency regulation module of the generator set line.

[0083] 102. Calculate the node disturbed power value at the target node according to the branch current change value at the target node, the node impedance value, and the disturbance node voltage change value.

[0084] Among them, the node impedance value is determined according to the impedance distribution parameter, and the node impedance value is the total impedance contained between the disturbance node and the node. It can be understood that the impedance in the line is analogous to the resistance, and the total impedance contained between the disturbance node and the node can be obtained by summing up the total impedance values contained between the disturbance node and the node; the branch current change value is obtained by distributing the disturbance node current change value to each branch line contained in the generator unit line based on the impedance distribution parameter. Specifically, the disturbance node current change value is distributed based on the proportion of the branch impedance value of each branch line to the total impedance value of the motor unit line. In the embodiment of the present application, the node disturbed power value at the target node is calculated based on the branch current change value and the node impedance value at the target node, combined with the disturbance node voltage change value. Since the loss of the disturbance power on the line and the difference in the influence of the disturbance on each node are fully considered, it is more suitable for the characteristics of the dual-high power system.

[0085] 103. Based on the node inertia distribution model of the generator unit line, and according to the length of the second transmission line from the target node to each generator, determine the node inertia value at the target node.

[0086] Among them, the node inertia distribution model is pre-constructed based on the inertia values of each generator and the first transmission line length value, and is used to characterize the distribution of generator inertia with node position in the generator set line. It should be noted that the node inertia distribution model of the generator set line is obtained by adding the sub-node inertia distribution models corresponding to all the generators in operation contained in the generator set line; the second transmission line length value is used to characterize the transmission line length value from the target node to the generator. It can be understood that by substituting the second transmission line length value into the node inertia distribution model, the node inertia value at the target node can be determined. In the embodiment of the present application, the node inertia value is calculated using the pre-established node inertia distribution model. Since the model describes the distribution of generator inertia with node position in the generator set line, the node inertia value of any node can be obtained based on the node position information.

[0087] 104. Determine the node frequency change rate at the target node according to the node disturbed power value and the node inertia value.

[0088] Specifically, the quotient between the node disturbed power value and several times the node inertia value can be determined as the node frequency change rate. In the embodiment of the present application, the node frequency change rate at any node is determined based on the node disturbed power value and the node inertia value at any node, meeting the need for system frequency regulation based on the node frequency change rate of any node, meeting the system frequency regulation requirements of the dual-high power system, and effectively improving the system frequency security of the dual-high power system.

[0089] Compared with the prior art, the embodiment of the present application distributes the disturbance node current change value to each branch line based on the impedance distribution parameter to obtain the branch current change value, and calculates the node disturbed power value of each node in combination with the disturbance node voltage change value. Since it fully considers the loss of the disturbance power on the line and the difference in the impact of the disturbance on each node, it is more suitable for the characteristics of the dual-high power system; further, the node inertia value is calculated using a pre-established node inertia distribution model. Since the model describes the distribution of the node inertia value in the line with the node position, the node inertia value of any node can be obtained according to the node position information, and then the node frequency change rate at any node can be obtained to meet the demand for system frequency regulation according to the node frequency change rate of any node, meet the system frequency regulation demand of the dual-high power system, and effectively improve the system frequency safety of the dual-high power system.

[0090] The embodiment of the present application provides another method for determining the node frequency change rate, such as Figure 3 As shown, the method includes:

[0091] 201. When a frequency disturbance is detected in a generator set line, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set line, a generator inertia value of each generator in the generator set line, and a first transmission line length value between the generators are obtained.

[0092] In an embodiment of the present application, when a frequency disturbance is detected in the generator set line, a measuring instrument is used to measure the voltage change value and the current change value of the disturbance node, and the impedance distribution parameter, the generator inertia value, and the first transmission line length value are obtained from the data.

[0093] 202. Based on the impedance distribution parameter, the disturbance node current change value is distributed to each branch line included in the generator unit line to obtain the branch current change value of each branch line.

[0094] Specifically, first, based on the impedance distribution parameters, the branch impedance value of each branch line included in the generator unit line is calculated, and the proportion of each branch impedance value to the total impedance value of the generator unit line is calculated. Figure 2 Taking the impedance distribution parameters recorded in the unit-line parameter model diagram as an example, point k represents the disturbance node. The frequency disturbance occurring at the disturbance node k will propagate from point k to the left and right directions. The left and right directions can be regarded as two branches. The total impedance value of the generator unit line is X′ d1 、X T1 、X 2k 、X k3 、X T2 , X′ d2 The branch impedance of the left branch is X′ d1 、X T1 、X 2k The ratio of the branch impedance value of the left branch to the total impedance value of the generator unit line is X′ d1 、X T1 、X 2k The sum of X′ d1 、X T1 、X 2k 、X k3 、X T2 , X′ d2 The quotient of the sum of the two, the branch impedance value of the right branch is X k3 、X T2 , X′ d2 The ratio of the branch impedance value of the right branch to the total impedance value of the generator set line is X k3 、X T2 , X′ d2 The sum of X′ d1 、X T1 、X 2k 、X k3 、X T2 , X′ d2 Furthermore, each branch line is taken as the target branch line one by one, and the product of the sum of the proportions corresponding to the other branch lines except the target branch line and the disturbance node current change value is determined as the branch current change value of the target branch line, that is,

[0095]

[0096] Wherein, ΔI1 represents the branch current change value of the left branch line, ΔI2 represents the branch current change value of the right branch line, and ΔI represents the disturbance node current change value.

[0097] Thus, the branch current change value of each branch line is obtained.

[0098] 203. Based on the impedance distribution parameter, obtain each impedance value between the disturbance node and the target node, and determine the sum of each impedance value as the node impedance value at the target node.

[0099] For example, the node impedance value at node 1 in the figure is X T1 、X 2k The node impedance at node 2 is X 2k wait.

[0100] 204. Calculate the node disturbed power value at the target node according to the branch current change value at the target node, the node impedance value, and the disturbance node voltage change value.

[0101] Specifically, the product of the node impedance value and the branch current change value of the branch line where the target node is located is determined as the disturbance power propagation voltage drop value at the target node, which can be expressed as the following formula:

[0102]

[0103] in, represents the disturbance power transmission voltage drop value at node i, ΔI i Indicates the branch current change value of the branch line where node i is located, Z ik Represents the node impedance value at node i.

[0104] Furthermore, the difference between the disturbance node voltage change value and the disturbance power propagation voltage drop value is determined as the node voltage change value at the target node, which can be expressed as the following formula:

[0105]

[0106] in, Indicates the node voltage change at node i, ΔU k Indicates the change in voltage at the disturbance node.

[0107] Finally, the product of the node voltage change value and the branch current change value is determined as the node disturbed power value at the target node, which can be expressed as the following formula:

[0108]

[0109] Where ΔP i represents the node disturbed power value at node i.

[0110] 205. Construct a node inertia distribution model for the generator set line.

[0111] Specifically, according to the generator inertia value of each generator and the length value of the first transmission line, a corresponding sub-node inertia distribution model is constructed based on the Gaussian distribution function.

[0112]

[0113] Among them, H m,i (x i ) represents the generator G m The nodal inertia at node i, a m,i Represents the parameter, H m Represents the generator G m The generator inertia value, c m,i represents the first transmission line length value, x i Represents node i to generator G m The second transmission line length value.

[0114] It should be noted that the non-uniformity of electromechanical wave propagation shows that when the disturbance propagates to the vicinity of the generator node, the inertia has a significant impact on it. When it is far away from the generator node, the inertia has a weak impact on it. Therefore, the distribution of the generator inertia on the remaining connected nodes decreases from near to far. From this analysis, it can be obtained that the scope of the generator inertia is distributed with the distance of the line6, and the distribution on the line is continuous. Based on this, the generator inertia can be processed according to the Gaussian function distribution on the line.

[0115] 206. Add the sub-node inertia distribution models of the generators in operation to obtain a node inertia distribution model of the generator set circuit.

[0116] For example, taking a dual-motor system as an example, the node inertia distribution model can be expressed as the following formula:

[0117] H i (x i )=αH m，i (x i )+βH g，i (x i ),

[0118] Among them, H i (x i ) represents the node inertia value at node i, H m，i (x i ) represents the generator G m The inertia value of the child node at node i, H g，i (x i ) represents the generator G gThe sub-node inertia values α and β at node i represent the operating status of the generator, including two values 0 and 1. When the value is 0, it means that the generator is in the exiting operating state, and when the value is 1, it means that the generator is in the starting operating state.

[0119] The node inertia distribution model curve of the dual-motor system is as follows: Figure 4 shown.

[0120] 207. Determine the node frequency change rate at the target node according to the node disturbed power value and the node inertia value.

[0121] Specifically, the quotient of the node disturbed power value and the node inertia value of a preset multiple is determined as the node frequency change rate at the target node.

[0122] Preferably, the preset multiple may be 2 times.

[0123] For example, taking a dual-motor system as an example, the node frequency change rate at the target node can be expressed as the following formula:

[0124]

[0125] in, represents the distribution of node frequency change rate, H i Indicates the node inertia value, H g Represents the generator G g The generator inertia value, x i -b i,g Represents node i to generator G g The second transmission line length value.

[0126] 208. Select multiple points in the generator unit line as preset nodes, and calculate the node frequency change rate at each preset node; and adjust the system frequency of the generator unit line according to the frequency change rate of each node.

[0127] It should be noted that the number of preset nodes can be selected according to the actual adjustment accuracy. For example, when the adjustment accuracy is high, a larger number of points can be selected as preset nodes. When the adjustment accuracy is low, a smaller number of points can be selected as preset nodes. Optionally, the quotient between the distribution of the node disturbed power value and the distribution of the node inertia value can be determined as the distribution of the node frequency change rate, and the system frequency can be adjusted according to the distribution of the node frequency change rate. At this time, the adjustment accuracy is the highest and the effect is the best.

[0128] The present application provides a method for determining a node frequency change rate. First, when a frequency disturbance is detected in a generator set circuit, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators are obtained; secondly, based on the branch current change value and the node impedance value at the target node and the disturbance node voltage change value, the node disturbed power value at the target node is calculated. The node impedance value is determined based on the impedance distribution parameter. The line current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter; thirdly, based on the node inertia distribution model of the generator set line, the node inertia value at the target node is determined according to the second transmission line length value from the target node to each of the generators, and the node inertia distribution model is pre-constructed according to the inertia values of each of the generators and the first transmission line length value; finally, the node frequency change rate at the target node is determined according to the node disturbed power value and the node inertia value. Compared with the prior art, the embodiment of the present application distributes the disturbance node current change value to each branch line based on the impedance distribution parameter to obtain the branch current change value, and calculates the node disturbed power value of each node in combination with the disturbance node voltage change value. Since it fully considers the loss of the disturbance power on the line and the difference in the impact of the disturbance on each node, it is more suitable for the characteristics of the dual-high power system; further, the node inertia value is calculated using a pre-established node inertia distribution model. Since the model describes the distribution of the node inertia value in the line with the node position, the node inertia value of any node can be obtained according to the node position information, and then the node frequency change rate at any node can be obtained to meet the demand for system frequency regulation according to the node frequency change rate of any node, meet the system frequency regulation demand of the dual-high power system, and effectively improve the system frequency safety of the dual-high power system.

[0129] Furthermore, as a response to the above Figure 1 The embodiment of the present application provides a device for determining the node frequency change rate, such as Figure 5 As shown, the device includes:

[0130] Data acquisition module 31, node disturbed power value calculation module 32, node inertia value determination module 33, node frequency change rate determination module 34;

[0131] a data acquisition module 31 for acquiring, when a frequency disturbance is detected in a generator set circuit, a disturbance node voltage change value and a disturbance node current change value at a disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators;

[0132] a node disturbed power value calculation module 32, configured to calculate the node disturbed power value at the target node based on the branch current change value and the node impedance value at the target node, and the disturbance node voltage change value, wherein the node impedance value is determined based on the impedance distribution parameter, and the branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter;

[0133] a node inertia value determining module 33, configured to determine the node inertia value at the target node based on a node inertia distribution model of the generator set line and according to the second transmission line length value from the target node to each of the generators, wherein the node inertia distribution model is pre-constructed based on the inertia values of each of the generators and the first transmission line length value;

[0134] The node frequency change rate determination module 34 is configured to determine the node frequency change rate at the target node according to the node disturbed power value and the node inertia value.

[0135] In specific application scenarios, the node disturbance power value calculation module is used to:

[0136] Based on the impedance distribution parameter, the disturbance node current change value is distributed to each branch line included in the generator set line to obtain a branch current change value of each branch line;

[0137] Based on the impedance distribution parameter, obtaining each impedance value between the disturbance node and the target node, and determining the sum of each impedance value as the node impedance value at the target node;

[0138] Determine the product of the node impedance value and the branch current change value of the branch line where the target node is located as the disturbance power propagation voltage drop value at the target node;

[0139] Determine the difference between the disturbance node voltage change value and the disturbance power propagation voltage drop value as the node voltage change value at the target node;

[0140] The product of the node voltage change value and the branch current change value is determined as the node disturbed power value at the target node.

[0141] In a specific application scenario, the node disturbed power value calculation module is further used to:

[0142] Calculating the branch impedance value of each branch line included in the generator set circuit based on the impedance distribution parameter, and calculating the proportion of each branch impedance value to the total impedance value of the generator set circuit;

[0143] Taking each of the branch routes as a target branch route one by one;

[0144] Determine the product of the sum of the proportions corresponding to other branch lines except the target branch line and the disturbance node current change value as the branch current change value of the target branch line;

[0145] The branch current change value of each branch line is obtained.

[0146] In a specific application scenario, before the node inertia value determination module, the device further includes a node inertia distribution model construction module, which is used to:

[0147] Constructing corresponding sub-node inertia distribution models based on the Gaussian distribution function according to the generator inertia value of each generator and the length value of the first transmission line;

[0148] The sub-node inertia distribution models of the generators in the running state are added together to obtain the node inertia distribution model of the generator set circuit.

[0149] In a specific application scenario, the node frequency change rate determination module is used to:

[0150] The quotient of the node disturbed power value and the node inertia value of a preset multiple is determined as the node frequency change rate at the target node.

[0151] In a specific application scenario, the device further includes a frequency adjustment module for:

[0152] Selecting multiple points in the generator set circuit as preset nodes, and calculating the node frequency change rate at each of the preset nodes;

[0153] The system frequency of the generator set circuit is adjusted according to the frequency change rate of each node.

[0154] In a specific application scenario, the sub-node inertia distribution model is expressed as the following formula:

[0155]

[0156] Among them, H m,i (x i) represents the generator G m At node x i The nodal inertia at a m,i Represents the parameter, H m Represents the generator G m The generator inertia value, c m,i Indicates the first transmission line length value.

[0157] The present application provides a device for determining a node frequency change rate. First, when a frequency disturbance is detected in a generator set circuit, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators are obtained; secondly, based on the branch current change value and the node impedance value at the target node and the disturbance node voltage change value, the node disturbed power value at the target node is calculated. The node impedance value is determined based on the impedance distribution parameter. The line current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter; thirdly, based on the node inertia distribution model of the generator set line, the node inertia value at the target node is determined according to the second transmission line length value from the target node to each of the generators, and the node inertia distribution model is pre-constructed according to the inertia values of each of the generators and the first transmission line length value; finally, the node frequency change rate at the target node is determined according to the node disturbed power value and the node inertia value. Compared with the prior art, the embodiment of the present application distributes the disturbance node current change value to each branch line based on the impedance distribution parameter to obtain the branch current change value, and calculates the node disturbed power value of each node in combination with the disturbance node voltage change value. Since it fully considers the loss of the disturbance power on the line and the difference in the impact of the disturbance on each node, it is more suitable for the characteristics of the dual-high power system; further, the node inertia value is calculated using a pre-established node inertia distribution model. Since the model describes the distribution of the node inertia value in the line with the node position, the node inertia value of any node can be obtained according to the node position information, and then the node frequency change rate at any node can be obtained to meet the demand for system frequency regulation according to the node frequency change rate of any node, meet the system frequency regulation demand of the dual-high power system, and effectively improve the system frequency safety of the dual-high power system.

[0158] According to one embodiment of the present application, a storage medium is provided, wherein the storage medium stores at least one executable instruction. The computer-executable instruction can execute the interface access test method in any of the above method embodiments.

[0159] Based on this understanding, the technical solution of the present application can be embodied in the form of a software product, which can be stored in a non-volatile storage medium (which can be a CD-ROM, USB flash drive, mobile hard disk, etc.), including a number of instructions for enabling a computer device (which can be a personal computer, server, or network device, etc.) to execute the methods described in each implementation scenario of the present application.

[0160] Figure 6 A schematic diagram of the structure of a terminal provided according to an embodiment of the present application is shown. The specific embodiment of the present application does not limit the specific implementation of the terminal.

[0161] like Figure 6 As shown, the terminal may include: a processor (processor) 402 , a communications interface (Communications Interface) 404 , a memory (memory) 406 , and a communication bus 408 .

[0162] The processor 402 , the communication interface 404 , and the memory 406 communicate with each other via a communication bus 408 .

[0163] The communication interface 404 is used to communicate with other devices such as clients or other servers.

[0164] The processor 402 is configured to execute the program 410 , and specifically may execute the relevant steps in the above-mentioned embodiment of the method for determining the node frequency change rate.

[0165] Specifically, the program 410 may include program codes, which include computer operation instructions.

[0166] Processor 402 may be a central processing unit (CPU), an application-specific integrated circuit (ASIC), or one or more integrated circuits configured to implement the embodiments of the present application. The one or more processors included in a computer device may be processors of the same type, such as one or more CPUs, or may be processors of different types, such as one or more CPUs and one or more ASICs.

[0167] The memory 406 is used to store the program 410. The memory 406 may include a high-speed RAM memory, and may also include a non-volatile memory (non-volatile memory), such as at least one disk memory.

[0168] The program 410 may be specifically configured to cause the processor 402 to perform the following operations:

[0169] When a frequency disturbance is detected in the generator set circuit, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators are obtained;

[0170] Calculating a node disturbed power value at the target node based on a branch current change value and a node impedance value at the target node and a disturbance node voltage change value, wherein the node impedance value is determined based on the impedance distribution parameter, and the branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter;

[0171] determining a node inertia value at the target node based on a node inertia distribution model of the generator set line and according to a second transmission line length value from the target node to each of the generators, wherein the node inertia distribution model is pre-constructed based on the inertia values of each of the generators and the first transmission line length value;

[0172] The node frequency change rate at the target node is determined according to the node disturbed power value and the node inertia value.

[0173] The storage medium may also include an operating system and a network communication module. The operating system is a program that manages the hardware and software resources of the physical device used to determine the node frequency change rate, supporting the execution of the information processing program and other software and / or programs. The network communication module is used to enable communication between components within the storage medium and with other hardware and software within the physical information processing device.

[0174] Each embodiment in this specification is described in a progressive manner, with each embodiment focusing on its differences from the other embodiments. References to the same or similar parts between the various embodiments are sufficient. For system embodiments, since they largely correspond to method embodiments, their description is relatively simple. For relevant parts, references to the description of the method embodiments are sufficient.

[0175] The methods and systems of the present application may be implemented in many ways. For example, the methods and systems of the present application may be implemented by software, hardware, firmware, or any combination of software, hardware, and firmware. The above order of steps for the method is for illustration only, and the steps of the method of the present application are not limited to the order specifically described above, unless otherwise specifically stated. In addition, in some embodiments, the present application may also be implemented as programs recorded in a recording medium, which include machine-readable instructions for implementing the methods according to the present application. Therefore, the present application also covers recording media that store programs for executing the methods according to the present application.

[0176] Obviously, those skilled in the art should understand that the modules or steps of the present application described above can be implemented using a general-purpose computing device, they can be concentrated on a single computing device, or distributed on a network composed of multiple computing devices. Alternatively, they can be implemented using program code executable by the computing device, so that they can be stored in a storage device and executed by the computing device. In some cases, the steps shown or described can be performed in a different order than herein, or they can be made into separate integrated circuit modules, or multiple modules or steps can be made into a single integrated circuit module for implementation. Thus, the present application is not limited to any specific combination of hardware and software.

[0177] The above description is merely a preferred embodiment of the present application and is not intended to limit the present application. Persons skilled in the art will readily appreciate that various modifications and variations are possible. Any modifications, equivalent substitutions, or improvements made within the spirit and principles of the present application shall be included within the scope of protection of the present application.

Claims

1. A method for determining a node frequency change rate, characterized in that: include: When a frequency disturbance is detected in the generator set circuit, a disturbance node voltage change value and a disturbance node current change value at the disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators are obtained; Calculating a node disturbed power value at the target node based on a branch current change value and a node impedance value at the target node and a disturbance node voltage change value, wherein the node impedance value is determined based on the impedance distribution parameter, and the branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter; determining a node inertia value at the target node based on a node inertia distribution model of the generator set line and according to a second transmission line length value from the target node to each of the generators, wherein the node inertia distribution model is pre-constructed based on the inertia values of each of the generators and the first transmission line length value; Determining a node frequency change rate at the target node according to the node disturbed power value and the node inertia value; The calculating the node disturbed power value at the target node according to the branch current change value and the node impedance value at the target node and the disturbance node voltage change value includes: Based on the impedance distribution parameter, the disturbance node current change value is distributed to each branch line included in the generator set line to obtain a branch current change value of each branch line; Based on the impedance distribution parameter, obtaining each impedance value between the disturbance node and the target node, and determining the sum of each impedance value as the node impedance value at the target node; Determine the product of the node impedance value and the branch current change value of the branch line where the target node is located as the disturbance power propagation voltage drop value at the target node; Determine the difference between the disturbance node voltage change value and the disturbance power propagation voltage drop value as the node voltage change value at the target node; Determine the product of the node voltage change value and the branch current change value as the node disturbed power value at the target node; The step of distributing the disturbance node current change value to each branch line included in the generator set circuit based on the impedance distribution parameter to obtain the branch current change value of each branch line includes: Calculating the branch impedance value of each branch line included in the generator set circuit based on the impedance distribution parameter, and calculating the proportion of each branch impedance value to the total impedance value of the generator set circuit; Taking each of the branch routes as a target branch route one by one; Determine the product of the sum of the proportions corresponding to other branch lines except the target branch line and the disturbance node current change value as the branch current change value of the target branch line; The branch current change value of each branch line is obtained.

2. The method according to claim 1, characterized in that Before determining the node inertia value at the target node based on the node inertia distribution model of the generator set line and according to the second transmission line length value from the target node to each of the generators, the method further includes: Constructing corresponding sub-node inertia distribution models based on the Gaussian distribution function according to the generator inertia value of each generator and the length value of the first transmission line; The sub-node inertia distribution models of the generators in the running state are added together to obtain the node inertia distribution model of the generator set circuit.

3. The method according to claim 1, characterized in that The determining the node frequency change rate at the target node according to the node disturbed power value and the node inertia value includes: The quotient of the node disturbed power value and the node inertia value of a preset multiple is determined as the node frequency change rate at the target node.

4. The method according to claim 1, wherein The method further comprises: Selecting multiple points in the generator set circuit as preset nodes, and calculating the node frequency change rate at each of the preset nodes; The system frequency of the generator set circuit is adjusted according to the frequency change rate of each node.

5. The method according to claim 2, characterized in that The sub-node inertia distribution model is expressed as the following formula: ， in, Indicates a generator On the node The nodal inertia at Indicates parameters, Indicates a generator The generator inertia value, Indicates the first transmission line length value.

6. A device for determining a node frequency change rate, characterized in that: include: a data acquisition module for acquiring, when a frequency disturbance is detected in a generator set circuit, a disturbance node voltage change value and a disturbance node current change value at a disturbance node, an impedance distribution parameter of the generator set circuit, a generator inertia value of each generator in the generator set circuit, and a first transmission line length value between the generators; a node disturbed power value calculation module, configured to calculate the node disturbed power value at the target node based on the branch current change value and the node impedance value at the target node, and the disturbance node voltage change value, wherein the node impedance value is determined based on the impedance distribution parameter, and the branch current change value is obtained by distributing the disturbance node current change value to each branch line included in the generator set line based on the impedance distribution parameter; a node inertia value determining module, configured to determine the node inertia value at the target node based on a node inertia distribution model of the generator set line and according to a second transmission line length value from the target node to each of the generators, wherein the node inertia distribution model is pre-constructed based on the inertia values of each of the generators and the first transmission line length value; a node frequency change rate determination module, configured to determine the node frequency change rate at the target node according to the node disturbed power value and the node inertia value; The node disturbed power value calculation module is used to: Based on the impedance distribution parameter, the disturbance node current change value is distributed to each branch line included in the generator set line to obtain a branch current change value of each branch line; Based on the impedance distribution parameter, obtaining each impedance value between the disturbance node and the target node, and determining the sum of each impedance value as the node impedance value at the target node; Determine the product of the node impedance value and the branch current change value of the branch line where the target node is located as the disturbance power propagation voltage drop value at the target node; Determine the difference between the disturbance node voltage change value and the disturbance power propagation voltage drop value as the node voltage change value at the target node; Determine the product of the node voltage change value and the branch current change value as the node disturbed power value at the target node; The node disturbed power value calculation module is further used to: Calculating the branch impedance value of each branch line included in the generator set circuit based on the impedance distribution parameter, and calculating the proportion of each branch impedance value to the total impedance value of the generator set circuit; Taking each of the branch routes as a target branch route one by one; Determine the product of the sum of the proportions corresponding to other branch lines except the target branch line and the disturbance node current change value as the branch current change value of the target branch line; The branch current change value of each branch line is obtained.

7. A storage medium storing at least one executable instruction, characterized in that: The executable instructions enable the processor to execute operations corresponding to the method for determining the node frequency change rate according to any one of claims 1 to 5.

8. A terminal comprising: A processor, a memory, a communication interface, and a communication bus, wherein the processor, the memory, and the communication interface communicate with each other via the communication bus; The memory is used to store at least one executable instruction, wherein the executable instruction enables the processor to perform an operation corresponding to the method for determining the node frequency change rate according to any one of claims 1 to 5.

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