A voltage-driven power flow sample generation method, system, device and storage medium

Abstract

A voltage-driven power flow sample generation method, system, device and storage medium, the method comprises: determining the active power output of the generator node based on the cross-section power control requirement through sensitivity analysis; generating voltage initial value by using direct current power flow method; generating power flow sample initial state based on inverse function method using voltage initial value; checking whether the generated power flow sample initial state meets the required state, if not, under the condition of meeting the active power output of the generator node, by modifying the node voltage initial value, generating the power flow sample adjusted to the required state. The present application is a general sample generation method, which can realize cross-section control while ensuring that the active power output of the generator does not exceed the limit, and proposes a power flow sample that meets the node and cross-section power constraints at the same time, significantly reducing the dependence on manpower for generating new power system operation mode. The voltage-driven power flow sample generation method of the present application significantly improves the sample generation efficiency and effectiveness.

Description

TECHNICAL FIELD

[0001] The application belongs to the technical field of power system operation analysis and calculation, and particularly relates to a voltage-driven power flow sample generation method, system, device and storage medium. BACKGROUND

[0002] With the wide application of modern computer technologies such as machine learning, the demand for high-quality complex power grid power flow samples is increasing, and it is an urgent need to establish a general sample generation method for related research. At the same time, new energy is widely connected to the power grid, accompanied by the application of large-scale power electronic equipment, and the scale and capacity of the power system are increasing, and the structure and operation mode of the power grid are becoming complex. For the adjustment of power flow for certain operation modes, the adjustment mode based entirely on artificial experience has been difficult to achieve the desired effect, and a general automatic method is needed to generate power flow samples that meet specific needs.

[0003] For the power flow sample generation method, the widely used methods include traditional analytical method, mathematical modeling method and artificial intelligence method. The traditional analytical method mainly includes power flow calculation, which includes Newton-Raphson method, PQ decomposition method and DC power flow method. Among them, the Newton-Raphson method is the most classic algorithm in power flow calculation, which has the characteristics of good convergence and high precision, but the Jacobian matrix needs to be recalculated at each power flow iteration, so a lot of time is consumed. The PQ decomposition method is extended on the basis of the Newton-Raphson method and is faster than the Newton-Raphson method in calculation speed. Researchers have also proposed more improved sample generation methods, such as planned power flow method and continuous power flow method, which can only generate samples, but the generation efficiency and data set distribution cannot meet the demand, and the key problem is that the existing methods rely on iterative power flow calculation, which faces the problems of ill-conditioned problem and power flow non-convergence. For the mathematical modeling method, the function inversion method is relatively practical at present, and its core idea is to use the node voltage amplitude and phase angle to calculate the node active power and reactive power. However, the function inversion method is still in the theoretical research stage and is mainly tested on small power grids, and it is still rarely applied to large power grids. For the artificial intelligence method, deep learning and reinforcement learning have good development prospects due to the development of computing power and are widely used in various scenarios, and adversarial learning and transfer learning are also more applied due to the update of technology. Deep learning has strong feature extraction capability and can solve complex nonlinear relationships, but it needs a large amount of data as support. SUMMARY

[0004] The purpose of the present application is to solve the problems in the prior art, and to provide a voltage-driven power flow sample generation method, system, device and storage medium, which establishes a general automatic method to generate power flow samples that meet specific needs.

[0005] To achieve the above object, the present application has the following technical solutions:

[0006] A voltage-driven power flow sample generation method, comprising:

[0007] Based on the cross-section power control requirement, the active power output of the generator node is determined by the sensitivity analysis method;

[0008] The initial voltage is generated by using the direct current power flow method;

[0009] Based on the inverse function method, the initial state of the power flow sample is generated by using the initial voltage;

[0010] Check whether the generated initial state of the power flow sample meets the required state, if not, under the condition that the active power output of the generator node does not exceed the limit, the initial voltage of the node is corrected to generate a power flow sample adjusted to the required state.

[0011] As a preferred scheme of the method of the present application, the voltage-driven power flow sample generation method of the present application further comprises the step of establishing a sample generation general object according to the base state power flow network, and the step of establishing a sample generation general object according to the base state power flow network comprises initializing the network, importing the grid information by using the InterPSS software, classifying the generator nodes, and establishing the general object.

[0012] As a preferred scheme of the method of the present application, the step of determining the active power output of the generator node based on the cross-section power control requirement by the sensitivity analysis method utilizes the generator output power transfer distribution factor GSDF to establish the linear relationship between the branch and the generator node, and for any generator node i When active power disturbance is injected into the grid , the line transmission power of a certain branch is changed , which is calculated as follows:

[0013]

[0014] In the formula, is the sensitivity of the active output power to the line power;

[0015] All k branches extending to a certain cross-section, then the relationship between the power change of each branch and the power change injected by all n generator nodes is the cross-section power, and the calculation expression is as follows:

[0016]

[0017] In the formula, represents the power change disturbance; represents the sensitivity of the generator active output power to the cross-section; a represents the adjustment proportion of the active power injected by the generator node;

[0018] Therefore, the active power output regulation range of the generator node is:

[0019]

[0020] wherein, and are the lower limit and the upper limit of the active power output of the generator node, respectively. i

[0021] As a preferred scheme of the method, the step of generating the voltage initial value by using the direct current power flow method comprises the following steps: generating the voltage phase angle by using the direct current power flow method , and the calculation expression is wherein, B is the admittance matrix without considering the ground branch; the voltage amplitude of the unconnected node is generated by perturbing the base state power flow network, the zero power injection constraint condition of the connected node is set to the highest priority, the voltage amplitude of the connected node is calculated using the unconnected node, the voltage amplitudes of the unconnected node and the connected node are updated, and the complete voltage phase is obtained by integrating the phase angle to obtain the complete voltage phase.

[0022] Further, as a preferred scheme of the method, the step of generating the voltage amplitude of the unconnected node by perturbing the base state power flow network is performed according to the following formula:

[0023]

[0024] wherein, is the voltage amplitude of the unconnected node; ; is the voltage amplitude of the unconnected node in the base state power flow.

[0025] As a preferred scheme of the method, the step of generating the initial state of the power flow sample by using the voltage initial value based on the inverse function method comprises the following steps:

[0026]

[0027] wherein, is the active power of the node i ;

[0028] is the reactive power of the node i ;

[0029] is the voltage amplitude of the node i ; ​

[0030] the voltage amplitude of the node j ;

[0031] the total number of nodes

[0032] the node label in the summation operation

[0033] the real part of mutual admittance between the node i and j ;

[0034] the phase angle difference between the node i and j ;

[0035] the imaginary part of mutual admittance between the node i and j ;

[0036] For any unknown node voltage amplitude or phase angle, the direct current flow method and the base state flow amplification method are used for solving; then the amplitudes and phase angles of all node voltages are taken as known conditions, the amplitudes and phase angles of the voltages are directly substituted into the power balance equation, so that the node active power and reactive power are solved to obtain the network all node state quantities, and the initial state of the power flow sample is obtained.

[0037] In the second aspect, a voltage-driven power flow sample generation system is provided, comprising:

[0038] A generator node active power output calculation module is configured to determine the generator node active power output based on the section power control demand through the sensitivity analysis method.

[0039] A voltage initial value generation module is configured to generate the voltage initial value by using the direct current flow method.

[0040] A power flow sample initial state generation module is configured to generate the power flow sample initial state based on the inverse function method by using the voltage initial value.

[0041] A voltage initial value correction module is configured to check whether the generated power flow sample initial state meets the required state, and if not, the power flow sample adjusted to the required state is generated by correcting the node voltage initial value under the condition that the generator node active power output does not exceed the limit.

[0042] As a preferred scheme of the system, the voltage-driven power flow sample generation system further comprises a sample generation general object establishment module configured to establish the sample generation general object according to the base state flow network.

[0043] The sample generation general object establishment module initializes a network, imports power grid information by using InterPSS software, classifies generator nodes, and establishes a general object.

[0044] As a preferred scheme of the system, the generator node active power output calculation module establishes a linear relationship between branches and generator nodes by using a generator output power transfer distribution factor GSDF, and for any generator node i injects active power disturbance into the power grid , causes line transmission power of a certain branch to change , and is calculated according to the following formula:

[0045]

[0046] In the formula, is a sensitivity of active output power to line power;

[0047] If all k branches of a certain section are extended, the power change of each branch corresponds to the relationship between the power change of all n generator nodes injected into the section, and the calculation expression is as follows:

[0048]

[0049] In the formula, represents a power change disturbance; represents a sensitivity of generator active output power to the section; represents an adjustment proportion of generator node injected active power;

[0050] Therefore, the active power output regulation range of the generator node is:

[0051]

[0052] In the formula, and are a lower limit and an upper limit of active power output of the generator node, respectively. i

[0053] As a preferred scheme of the system, the voltage initial value generation module generates voltage phase angles according to generator node active power output by using a direct current power flow method, and the calculation expression is In the formula, B is a susceptance matrix without considering ground branches.

[0054] ​The non-connected node voltage amplitude is generated by disturbing the base state power flow network, the zero power injection constraint condition of the connected node is placed at the highest priority, the connected node voltage amplitude is calculated using the non-connected node, the non-connected node and the connected node voltage update the voltage amplitude, and the complete voltage phasor is obtained by integrating the phase angle.

[0055] Further, as a preferred scheme of the system, the voltage initial value generation module disturbs the non-connected node voltage amplitude according to the following formula:

[0056]

[0057] wherein, is the non-connected node voltage amplitude; ; is the non-connected node voltage amplitude in the base state power flow.

[0058] As a preferred scheme of the system, the power flow sample initial state generation module substitutes the voltage vector of all nodes into the following power balance equation:

[0059]

[0060] wherein, is the active power of node i ;

[0061] is the reactive power of node i ;

[0062] is the voltage amplitude of node i ;

[0063] is the voltage amplitude of node j ;

[0064] is the total number of nodes;

[0065] is the node label in the summation operation;

[0066] is the real part of the mutual admittance between node i and j ;

[0067] is the voltage phase angle difference between i and j nodes;

[0068] is the imaginary part of the mutual admittance between i and j nodes.

[0069] For any unknown node voltage magnitude or phase angle, the DC power flow method and the ground state power flow amplification method are used to solve it. Then, using the magnitude and phase angle of all node voltages as known conditions, the magnitude and phase angle of the voltages are directly substituted into the power balance equation to solve for the active and reactive power of the nodes, thereby obtaining all the node state variables of the network and obtaining the initial state of the power flow sample.

[0070] Thirdly, an electronic device is provided, comprising:

[0071] Memory, storing at least one instruction; and

[0072] The processor executes the instructions stored in the memory to implement the voltage-driven power flow sample generation method.

[0073] Fourthly, a computer-readable storage medium is provided, the computer-readable storage medium storing a computer program, which, when executed by a processor, implements the voltage-driven power flow sample generation method.

[0074] Compared with the prior art, the first aspect of the present invention has at least the following beneficial effects:

[0075] Based on the power control requirements of a specific section, the active power output of generator nodes is adjusted using a sensitivity method. During the voltage initial value correction stage, the generated power flow samples are checked. If they do not meet the requirements, a suitable node voltage initial value correction mechanism is used to adjust the power flow samples to the desired state. This invention ensures that generator active power output does not exceed limits while achieving section control, and proposes power flow samples that simultaneously satisfy node and section power constraints. This significantly reduces the reliance on manual labor in generating new power system operation modes, making data-driven sample generation methods feasible. This invention uses the inverse function method to generate the initial state of power flow samples using voltage initial values. By correcting the node voltage initial values, power flow samples adjusted to the desired state are generated. This voltage-driven power flow sample generation method significantly improves sample generation efficiency and effectiveness. This invention proposes a general sample generation method that can directly generate samples or add constraints using a general interface under different operation mode requirements.

[0076] It is understood that the beneficial effects of the second to fourth aspects mentioned above can be found in the relevant descriptions in the first aspect mentioned above, and will not be repeated here. Attached Figure Description

[0077] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments or prior art description will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and other drawings can be obtained by those skilled in the art without any creative effort.

[0078] Figure 1 The flow chart of the voltage-driven power flow sample generation method in the embodiment of the present application;

[0079] Figure 2 The class diagram of the sample generation model integrated with section constraints in the embodiment of the present application;

[0080] Figure 3 The module structure block diagram of the voltage-driven power flow sample generation system in the embodiment of the present application. DETAILED DESCRIPTION

[0081] In the following description, specific details are set forth in order to provide a thorough understanding of embodiments of the present application. However, persons of ordinary skill in the art will readily recognize that embodiments of the present application can be practiced without these specific details. In other instances, well-known structures, devices, circuits, and methods have not been described in detail in order to avoid obscuring the present application.

[0082] In addition, in the description of the present application and the appended claims, the terms "first", "second", "third" and the like are only used to distinguish description, and cannot be understood as indicating or implying relative importance.

[0083] The existing power flow sample generation method can solve the problem of sample missing, but there is a common problem that a general sample generation method is not established. The so-called general is that the generated sample can not only meet the node physical constraints of power grid operation, but also meet some specific operation modes. Therefore, the present application establishes a general voltage-driven power flow sample generation method, which is used for researching the generation problem of actual power grid data and meeting the node and section power constraints.

[0084] Embodiment 1

[0085] Please refer to Figure 1 The voltage-driven power flow sample generation method in the embodiment of the present application comprises:

[0086] Step one, establishing a general object of sample generation algorithm according to the base state power flow network;

[0087] Initialize the network, import the grid information into the algorithm program by InterPSS, classify the nodes, and establish the general object CaseGenAclfNetAdapter.

[0088] Step two, determine the active power output of the generator node based on the power control requirements of a certain section through sensitivity analysis method.

[0089] This method uses the generation shift distribution factor (GSDF) to establish the relationship between branches and generator nodes.

[0090] For any generator node i , if the active power disturbance injected into the grid causes a change in the line transmission power of a certain branch , then:

[0091]

[0092] where is the GSDF, which is the sensitivity of active output power to line power.

[0093] Extending to all k branches of a certain section, it expresses the relationship between the power change of each branch and the injected power change of all n generator nodes. The linear relationship is superimposed, and the

[0094]

[0095] where represents the power change disturbance; represents the sensitivity of generator active output power to the section; indicates the adjustment proportion of node injected active power.

[0096] Generator node active power output control range:

[0097]

[0098] where and are the lower and upper limits of the active power output of the generator node i , respectively.

[0099] DC power flow method generates voltage phase angle :

[0100]

[0101] where, B is the admittance matrix without considering the ground branch.

[0102] Step three, generating voltage initial value: perturbing the base flow network to generate the unconnected node voltage amplitude. The characteristic of the connected node is that the node injection current is zero, only playing the role of electrical connection. Its zero power injection constraint condition is in the highest priority, and the voltage amplitude of the connected node needs to be calculated by the unconnected node. Then the voltage amplitude of the unconnected node and the connected node is updated, and the complete voltage phasor is obtained by integrating the phase angle:

[0103] The voltage amplitude of the unconnected node type node in it is perturbed, and the expression is as follows:

[0104]

[0105] where, is the voltage amplitude of the unconnected node; ; is the voltage amplitude of the unconnected node in the base flow.

[0106] Step four, solving the flow based on the inverse function method using the initial value:

[0107] According to the advantage characteristics of the inverse function method, the full node voltage vector is directly substituted into the power balance equation:

[0108]

[0109] where, is the active power of node i ;

[0110] is the reactive power of node i ;

[0111] is the voltage amplitude of node i ;

[0112] is the voltage amplitude of node j ;

[0113] is the total number of nodes;

[0114] is the node label in the addition operation on the right side of the formula;

[0115] is the real part of the mutual admittance between i and j node;

[0116] isi and j the voltage phase angle difference between nodes;

[0117] for i and j the imaginary part of mutual admittance between nodes;

[0118] For any unknown node voltage amplitude or phase angle, it can be solved by the direct current flow method and the base state flow amplification method. Then, with the amplitude and phase angle of all node voltages as known conditions, the voltage amplitude and phase angle are directly substituted into the right side of the equation, so as to solve the node active power and reactive power to obtain all the node state quantities of the network, i.e. the initial state of the power flow sample.

[0119] Step five, based on the voltage initial value correction link, checks the generated power flow sample, and if it does not meet the requirements, adjusts the power flow sample to the required state by correcting the node voltage initial value.

[0120] In the working of the above-mentioned power flow section control, the most important thing is to ensure that the generator active power does not exceed the limit while realizing the section control. In view of the requirement of section control, the method of the application proposes a section control scheme based on the sensitivity method, which can make the section power reach the expected value under the control of the generator. In view of the requirement of generator limit, a control strategy of generator active power output is proposed, so that the generator active power output does not exceed the limit in the adjustment process. Then, the direct current flow is used to realize the integration of the section power control mode and the power flow sample generation method.

[0121] In step two, the control problem of the section flow is converted into the control problem of the generator active power injection, so the research focus returns to the generation of node parameters, thereby facilitating the unified correction of node state quantities.

[0122] The relationship between branch active power flow and generator node injection power is established by using the generator output power transfer distribution factor, which is linear, and the generator output active power adjustment scheme that meets the section flow target can be obtained.

[0123] The input value of the active power injection of each node in the direct current flow calculation is the above-mentioned generator output active power adjustment result.

[0124] The above-mentioned voltage-driven power flow sample generation method of the application can be developed and realized based on JAVA and by using the InterPSS simulation software, and a voltage-driven power flow sample generation platform that meets the node and section power constraints is obtained.

[0125] Preferably, the platform is realized based on JAVA, and each step in the power flow sample generation method is abstracted as an interface and an object system.

[0126] AsFigure 2 As shown, the interface and object system of the power flow sample generation platform meeting the node and section power constraints comprises:

[0127] IlfCaseGenAlgorithm: interface and common method for generating general power flow sample objects;

[0128] IInterfaceControlAlgorithm: interface for generating section power flow control algorithm objects;

[0129] InterfaceControlAlgorithm: object-oriented section power flow control algorithm object;

[0130] InterfaceCalculate: object-oriented section power flow calculation method;

[0131] AclfInterface: section object;

[0132] GenControl: object-oriented generator active power output adjustment method.

[0133] Embodiment 2

[0134] Please refer to Figure 3 , the voltage-driven power flow sample generation system of another embodiment of the present application comprises:

[0135] The generator node active power output calculation module 2 is used to determine the generator node active power output based on the section power control demand through the sensitivity analysis method;

[0136] The voltage initial value generation module 3 is used to generate the voltage initial value by using the direct current power flow method;

[0137] The power flow sample initial state generation module 4 is used to generate the power flow sample initial state based on the inverse function method by using the voltage initial value;

[0138] The voltage initial value correction module 5 is used to check whether the generated power flow sample initial state meets the required state, and if not, the power flow sample adjusted to the required state is generated by correcting the node voltage initial value under the condition that the generator node active power output does not exceed the limit.

[0139] In a possible implementation, the voltage-driven power flow sample generation system of the present application further comprises a sample generation general object establishment module 1 for establishing a sample generation general object according to the base state power network; the sample generation general object establishment module 1 initializes the network, imports the power grid information by using the InterPSS software, classifies the generator nodes, and establishes the general object.

[0140] In a possible implementation, the generator node active power output calculation module 2 establishes a linear relationship between the branch and the generator node by using the generator output power transfer distribution factor GSDF, and for any generator node i injecting active power disturbance into the power grid causes the line transmission power of a certain branch to change The calculation formula is as follows:

[0141]

[0142] In the formula, is the sensitivity of active output power to line power;

[0143] If all k branches of a certain section are extended, the power change of each branch corresponds to the relationship between the power changes of all n generator nodes injected into the section, and the calculation expression is as follows:

[0144]

[0145] In the formula, represents the power change disturbance; represents the sensitivity of generator active output power to the section; represents the adjustment proportion of generator node injected active power;

[0146] Therefore, the active power output regulation range of the generator node is:

[0147]

[0148] In the formula, and are the lower limit and the upper limit of the active power output of the generator node i , respectively.

[0149] In a possible implementation, the voltage initial value generation module 3 generates the voltage phase angle of the generator node according to the active power output of the generator node by using the direct current power flow method, and the calculation formula is as follows: In the formula, B is the admittance matrix without considering the ground branch;

[0150] The voltage amplitude of the unconnected node is generated by disturbing the base state power flow network, the zero power injection constraint condition of the connected node is placed in the highest priority, the voltage amplitude of the connected node is calculated using the unconnected node, the voltage amplitudes of the unconnected node and the connected node are updated, and the complete voltage phasor is obtained by integrating the phase angle.

[0151] Furthermore, the voltage initial value generation module 3 disturbs the voltage amplitude of the unconnected node according to the following formula:

[0152]

[0153] wherein, is the non-interconnected node voltage magnitude; ; is the non-interconnected node voltage magnitude in the base flow.

[0154] In one possible implementation, the power flow sample initial state generation module 4 substitutes all node voltage vectors into the following power balance equation:

[0155]

[0156] wherein, is the active power of node i ;

[0157] is the reactive power of node i ;

[0158] is the voltage magnitude of node i ;

[0159] is the voltage magnitude of node j ;

[0160] is the total number of nodes;

[0161] is the node index in the summation operation on the right side of the equation;

[0162] is the real part of the mutual admittance between node i and j ;

[0163] is the voltage phase angle difference between node i and j ;

[0164] is the imaginary part of the mutual admittance between node i and j ;

[0165] For any unknown node voltage magnitude or phase angle, it can be solved by the direct current power flow method and the base flow amplification method. Then, the voltage magnitude and the phase angle are directly substituted into the right side of the equation with all node voltage magnitudes and phase angles as known conditions, so as to solve the node active power and the node reactive power to obtain all node state quantities of the network, i.e., the power flow sample initial state.

[0166] Example 3

[0167] An electronic device, comprising:

[0168] a memory storing at least one instruction; and

[0169] a processor executing the instruction stored in the memory to implement the voltage-driven power flow sample generation method described in Embodiment 1.

[0170] Embodiment 4

[0171] A computer readable storage medium, the computer readable storage medium storing a computer program, the computer program being executed by a processor to implement the voltage-driven power flow sample generation method described in Embodiment 1.

[0172] The computer program includes computer program code, which can be in the form of source code, object code, executable code, or some intermediate form. The computer readable storage medium can include any entity or device capable of carrying the computer program code, media, U disk, mobile hard disk, magnetic disk, optical disk, computer memory, read-only memory, random access memory, electrical carrier signal, telecommunication signal, and software distribution medium, etc. It should be noted that the computer readable medium includes content that can be appropriately added or reduced according to the requirements of legislation and patent practice in the jurisdiction, for example, in some jurisdictions, according to legislation and patent practice, the computer readable medium does not include electrical carrier signals and telecommunication signals. For the convenience of description, the above content only shows the part related to the embodiments of the present application, and the specific technical details are not disclosed, please refer to the method part of the embodiments of the present application. The computer readable storage medium is non-transitory and can be stored in the storage device formed by various electronic devices, and can realize the execution process described in the method of the embodiments of the present application.

[0173] Those skilled in the art should understand that the embodiments of the present application can be provided as a method, a system, or a computer program product. Therefore, the present application can take the form of a complete hardware embodiment, a complete software embodiment, or an embodiment combining software and hardware aspects. Moreover, the present application can take the form of a computer program product implemented on one or more computer usable storage media (including but not limited to disk storage, CD-ROM, optical storage, etc.) containing computer usable program code.

[0174] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart or flows and / or block diagram block or blocks. Figure 1 one or more flow or flows and / or block diagram block or blocks. Figure 1 one or more flow or flows and / or block diagram block or blocks.

[0175] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart or flows and / or block diagram block or blocks. Figure 1 one or more flow or flows and / or block diagram block or blocks. Figure 1 one or more flow or flows and / or block diagram block or blocks.

[0176] The computer program instructions can also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer-implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart or flows and / or block diagram block or blocks. Figure 1 one or more flow or flows and / or block diagram block or blocks. Figure 1 one or more flow or flows and / or block diagram block or blocks.

[0177] Finally, it should be noted that the above-mentioned embodiments are merely intended to illustrate the technical solutions of the present application, rather than limit the same. Although the present application has been described in detail with reference to the above-mentioned embodiments, those skilled in the art should understand that the specific embodiments of the present application can be modified or equivalent replacements without departing from the spirit and scope of the present application, and any modifications or equivalent replacements shall be included in the protection scope of the claims of the present application.

Claims

1. A method for generating voltage-driven power flow samples, characterized in that, include: Based on the requirements of cross-sectional power control, the active power output of the generator node is determined by sensitivity analysis. And the generation of initial voltage values ​​using the DC power flow method; The initial state of the power flow sample is generated using the initial voltage value based on the inverse function method; Check whether the initial state of the generated power flow sample meets the required state. If it does not meet the required state, then, under the condition that the active power output of the generator node does not exceed the limit, generate a power flow sample adjusted to the required state by correcting the initial value of the node voltage. The step of determining the active power output of generator nodes based on cross-sectional power control requirements and using sensitivity analysis involves establishing a linear relationship between branches and generator nodes using the generator output power transfer distribution factor (GSDF). For any generator node... i Injecting active power disturbances into the power grid At that time, it caused a certain branch road Line transmission power variation Calculate using the following formula: In the formula, It is the sensitivity of active power output to line power; Extending to all k branches of a certain cross-section, the relationship between the power change of each branch and the power injection changes of all n generator nodes is expressed as follows: In the formula, Indicates power variation disturbance; This indicates the sensitivity of the generator's active power output to the cross-section; This indicates the adjustment ratio of the active power injected into the generator node; Therefore, the active power output control range of the generator node is: In the formula, and Generator nodes i The lower and upper limits of contribution and effort; The step of generating initial voltage values ​​using the DC power flow method includes calculating the active power output of the generator nodes. Voltage phase angle generated using DC power flow method The calculation expression is: In the formula B The susceptance matrix of the ground branch is not considered; The voltage amplitude of non-connected nodes is generated by perturbing the ground state power flow network. The zero power injection constraint of connected nodes is set to the highest priority. The voltage amplitude of connected nodes is calculated using non-connected nodes. The voltage amplitudes of non-connected nodes and connected nodes are updated. The phase angle is integrated to obtain the complete voltage phasor. The step of generating the voltage amplitude of non-connected nodes by perturbing the ground-state power flow network involves perturbing the voltage amplitude of non-connected nodes using the following formula: in, This refers to the voltage amplitude at non-connecting nodes; ; This represents the voltage amplitude of non-connected nodes in the ground-state power flow.

2. The voltage-driven power flow sample generation method according to claim 1, characterized in that, It also includes the step of generating a general object from samples based on the ground-state power flow network. This step includes initializing the network, importing power grid information using InterPSS software, classifying generator nodes, and generating a general object.

3. The voltage-driven power flow sample generation method according to claim 1, characterized in that, The step of generating the initial state of the power flow sample using the inverse function method involves substituting all node voltage vectors into the following power balance equation: In the formula, For nodes i The active power; For nodes i reactive power; For nodes i The voltage amplitude; For nodes j The voltage amplitude; This represents the total number of nodes. The node labels in the summation operation; For nodes i and j The real part of the mutual admittance between them; for i and j Voltage phase angle difference between nodes; for i and j The imaginary part of the mutual admittance between nodes; For any unknown node voltage magnitude or phase angle, the DC power flow method and the ground state power flow amplification method are used to solve it. Then, using the magnitude and phase angle of all node voltages as known conditions, the magnitude and phase angle of the voltages are directly substituted into the power balance equation to solve for the active and reactive power of the nodes, thereby obtaining all the node state variables of the network and obtaining the initial state of the power flow sample.

4. A voltage-driven power flow sample generation system, characterized in that, include: The generator node active power output calculation module is used to determine the generator node active power output based on the cross-sectional power control requirements and through sensitivity analysis. The voltage initial value generation module is used to generate initial voltage values ​​using the DC power flow method. The power flow sample initial state generation module is used to generate the power flow sample initial state based on the inverse function method using the initial voltage value. The voltage initial value correction module is used to check whether the initial state of the generated power flow sample meets the required state. If it does not meet the requirements, the power flow sample is adjusted to the required state by correcting the initial value of the node voltage, provided that the active power output of the generator node does not exceed the limit. The generator node active power output calculation module uses the generator output power transfer distribution factor (GSDF) to establish a linear relationship between the branch and the generator node for any generator node. i Injecting active power disturbances into the power grid At that time, it caused a certain branch road Line transmission power variation Calculate using the following formula: In the formula, It is the sensitivity of active power output to line power; Extending to all k branches of a certain cross-section, the relationship between the power change of each branch and the power injection changes of all n generator nodes is expressed as follows: In the formula, Indicates power variation disturbance; This indicates the sensitivity of the generator's active power output to the cross-section; This indicates the adjustment ratio of the active power injected into the generator node; Therefore, the active power output control range of the generator node is: In the formula, and Generator nodes i The lower and upper limits of contribution and effort; The voltage initial value generation module generates the voltage phase angle based on the active power output of the generator node using the DC power flow method. The calculation expression is: In the formula B It does not consider the susceptance matrix of the ground branch; it generates the voltage amplitude of non-connected nodes by perturbing the ground state power flow network, puts the zero power injection constraint of the connected nodes in the highest priority, uses the non-connected nodes to calculate the voltage amplitude of the connected nodes, updates the voltage amplitude of the non-connected nodes and the connected nodes, and integrates the phase angle to obtain the complete voltage phasor. The initial voltage value generation module perturbs the voltage amplitude of non-connection nodes using the following formula: in, This refers to the voltage amplitude at non-connecting nodes; ; This represents the voltage amplitude of non-connected nodes in the ground-state power flow.

5. The voltage-driven power flow sample generation system according to claim 4, characterized in that, It also includes a sample generation general object establishment module, which is used to establish a sample generation general object based on the ground state power flow network; The sample generation general object establishment module initializes the network, imports power grid information using InterPSS software, classifies generator nodes, and establishes general objects.

6. The voltage-driven power flow sample generation system according to claim 4, characterized in that, The power flow sample initial state generation module substitutes all node voltage vectors into the following power balance equation: In the formula, For nodes i The active power; For nodes i reactive power; For nodes i The voltage amplitude; For nodes j The voltage amplitude; This represents the total number of nodes. The node labels in the summation operation; For nodes i and j The real part of the mutual admittance between them; for i and j Voltage phase angle difference between nodes; for i and j The imaginary part of the mutual admittance between nodes; For any unknown node voltage magnitude or phase angle, the DC power flow method and the ground state power flow amplification method are used to solve it. Then, using the magnitude and phase angle of all node voltages as known conditions, the magnitude and phase angle of the voltages are directly substituted into the power balance equation to solve for the active and reactive power of the nodes, thereby obtaining all the node state variables of the network and obtaining the initial state of the power flow sample.

7. An electronic device, characterized in that, include: Memory, storing at least one instruction; and The processor executes instructions stored in the memory to implement the voltage-driven power flow sample generation method as described in any one of claims 1 to 3.

8. A computer-readable storage medium storing a computer program, characterized in that, When the computer program is executed by the processor, it implements the voltage-driven power flow sample generation method as described in any one of claims 1 to 3.

Images