Lower-level flexibility resource output checking method and system considering upper-level power grid dispatching instruction

Abstract

The invention discloses a lower-level flexibility resource output checking method and system considering an upper-level power grid dispatching instruction, and the method comprises the steps: obtaining line parameters and topological features of a power distribution network, and calculating the voltage-active power sensitivity and line transmission power sensitivity of each node; calculating the output of flexible resources, the voltage of each node of the power distribution network and the branch power flow under the current instruction by combining the dispatching instruction; judging whether each node voltage or branch power flow is out of limit; if not, not carrying out instruction correction; if yes, taking the minimum adjustment of the scheduling instruction as a target function, and combining flexible resource output constraint, node voltage safety constraint and line power flow constraint to establish a flexible resource instruction correction model; and solving the flexible resource instruction correction model, and obtaining a corrected flexible resource output result. The problem that inferior flexible resources are not safe when participating in regulation and control when a dispatching instruction issued by an upper-level power grid is adjusted is solved.

Description

Technical Field

[0001] The present invention relates to the field of electric power technology, and in particular to a method and system for verifying the output of subordinate flexibility resources taking into account dispatching instructions of superior power grids. Background Art

[0002] The continuous development of social economy has caused a sharp increase in electricity demand. Traditional centralized power generation systems mainly rely on fossil energy such as coal and oil, causing environmental pollution and energy depletion. Therefore, the construction of new power systems should focus on renewable energy. At present, distributed resources based on wind power, photovoltaics and energy storage are participating in the development of the power industry by replacing traditional fossil energy with the characteristics of cleanliness, abundant reserves and strong flexibility.

[0003] Flexible resources have small single-machine capacity, are geographically dispersed, and are affected by factors such as weather. Their output is random and uncertain, which brings challenges to the dispatch of distribution networks. At present, flexible resources participate in grid control in an aggregated form through the fast data processing technology and network communication means of virtual power plants. Existing research includes: extracting the power output characteristics of various distributed resources, aggregating multiple distributed resources into equivalent resource aggregates, and the upper power grid directly sends control instructions to the aggregates. The aggregates respond to the instructions and distribute power internally. The current method can effectively increase the scale of flexible resource connection and overcome its geographical limitations. It is an important model for flexible resource connection.

[0004] Since the upper power grid cannot accurately grasp the information of the lower power grid, when the upper power grid issues a dispatching instruction, the lower power grid may over-adjust the output of flexible resources to meet the dispatching demand, causing safety problems such as voltage exceeding the limit of the lower power grid node. Therefore, the lower power grid needs to evaluate the rationality of the dispatching instruction, check and correct the dispatching instruction of the upper power grid to ensure the safe operation of the lower power grid. Therefore, a method for checking the output of lower flexible resources that can take into account the dispatching instruction of the upper power grid is urgently needed. Summary of the invention

[0005] The present invention provides a method and system for verifying the output of subordinate flexible resources taking into account the dispatching instructions of the superior power grid. The technical problem to be solved by the method is how to adjust the dispatching instructions issued by the superior power grid so that no safety problems occur when the subordinate flexible resources participate in the regulation.

[0006] In a first aspect, the present invention provides a method for verifying the output of a subordinate flexibility resource taking into account a dispatching instruction of a superior power grid, comprising:

[0007] S1: Obtain the line parameters and topological characteristics of the distribution network, and calculate the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity; wherein the line parameters of the distribution network include line equivalent resistance, line equivalent inductance, and line equivalent ground admittance;

[0008] S2: According to the dispatching instruction issued by the upper power grid, calculate the output that needs to be adjusted by the flexible resources under the current instruction; then combine the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity to simulate and calculate the voltage of each node and the power flow of each branch of the distribution network; compare the calculation results of the voltage of each node and the power flow of each branch of the distribution network with the instruction execution conditions to determine whether there is any over-limit of the node voltage or branch power flow of the distribution network: if there is no over-limit of the node voltage or branch power flow, there is no need to correct the dispatching instruction issued by the upper power grid this time, and directly issue the execution dispatching instruction; if there is any over-limit of the node voltage or branch power flow, enter S3;

[0009] S3: Taking the minimum adjustment of the dispatching instruction as the objective function, and the flexible resource output constraint, node voltage safety constraint and line flow constraint as the constraint conditions, a flexible resource instruction correction model is constructed and solved by the solver to obtain the corrected flexible resource output result and issue the corrected dispatching instruction for execution.

[0010] Furthermore, the specific steps of S1 are:

[0011] S11: Collect the line equivalent resistance, line equivalent inductance, and line equivalent ground admittance between each bus node of the distribution network, and then calculate and construct the Jacobian matrix; the inversion of the Jacobian matrix is ​​the voltage-power sensitivity matrix between the bus nodes, which represents the influence of the active and reactive power changes of the bus nodes on the voltage amplitude and phase angle; among them, the expression of the voltage-power sensitivity matrix between each bus node is:

[0012]

[0013] Where: Represents the phase angle of each node in the distribution network; Indicates the voltage of each node in the distribution network; represents the active power injected into the node; represents the reactive power injected into the node; Indicates the change of phase angle of each node in the distribution network; Indicates the change of voltage at each node of the distribution network; Indicates the change of active power of each node in the distribution network; Indicates the change of reactive power of each node in the distribution network; It is the sensitivity factor reflecting the node voltage change caused by the active power change of the node; It is a sensitivity factor that reflects the node voltage change caused by the node's reactive power change.

[0014] S12: Consider only the influence of active power regulation on node voltage and branch power flow, divide the Jacobian inverse matrix into blocks, and extract The sub-array is the voltage-active power sensitivity matrix between each bus node, which is used to measure the impact of active power changes on node voltage; among them, the expression of the voltage-active power sensitivity matrix between each bus node is:

[0015]

[0016]

[0017] Where: Indicates The voltage change of each node; Indicates The active power of the flexible resources under each node is adjusted according to the instructions; is the voltage-active power sensitivity factor, reflecting the The active power change of each node leads to The voltage change of each node; is the number of nodes in the distribution network;

[0018] S13: According to the topological connection relationship between the nodes of the distribution network, the line transmission power sensitivity matrix is ​​obtained to measure the impact of active power changes on branch power flows; wherein, the expression of the line transmission power sensitivity matrix between each bus node and each branch is:

[0019]

[0020]

[0021]

[0022] Where: Indicates Changes in active power flowing through the lines; is the line transmission power sensitivity factor, reflecting the The active power change of each node leads to Power variation of the lines; is the number of lines in the distribution network; For line Active power of For line Reactive power; Representation Node The set of lines passing through to the root node of the distribution network; Representation Node To line The set of lines that the head-end node passes through; Representation Node With Node The lines between.

[0023] Furthermore, the calculation formula for the output that needs to be adjusted by the flexibility resource under the current instruction in S2 is:

[0024] Flexible resource output calculation

[0025]

[0026] Where: Indicates the current instruction to the node Injected active power; Indicates that the flexible resource is delivering power to the node normally. Injected active power; Indicates the current instruction The active power of flexible resources under each node is adjusted according to the instructions.

[0027] Furthermore, the calculation formula for the voltage of each node of the distribution network and the power flow of each branch in S2 is:

[0028] Node voltage calculation

[0029]

[0030] Where: Indicates the node under the current instruction Voltage; Indicates the node when the flexible resource is working normally Voltage; Indicates the nodes caused by the output of each flexible resource according to the current instruction Voltage changes;

[0031] Line flow calculation

[0032]

[0033] Where: Indicates the current command line Active power of Indicates the line when the flexible resource is working normally Active power of Indicates the lines caused by the output of each flexible resource according to the current instruction Active power changes.

[0034] Furthermore, the specific process of comparing the calculation result with the instruction execution condition in S2 to determine whether the limit is exceeded is:

[0035] If the node voltage or line flow does not meet the instruction execution condition, it is determined to be out of limit, otherwise it is not out of limit; the instruction execution condition is specifically:

[0036]

[0037]

[0038] Where: Indicates the upper limit of the node voltage; Indicates the lower limit of the node voltage; Indicates line Rated power.

[0039] After obtaining the node voltage and line flow, the flexible resource command is checked. If the node voltage or line flow does not exceed the limit, it means that the control command of the flexible resource will not cause safety problems for the lower-level power grid, and the control command is issued reasonably; if the node voltage or line flow exceeds the limit, it will affect the safety of the lower-level power grid. This means that the control command is not issued reasonably and needs to be adjusted.

[0040] Furthermore, the objective function in S3 is:

[0041]

[0042] Where: Respectively represent the order before and after the verification The active power adjusted by the flexible resources under each node according to the instruction. Furthermore, the flexible resource output constraint, node voltage safety constraint and line flow constraint in S3 are specifically:

[0043] Flexible resource output constraints

[0044]

[0045]

[0046] Where: Indicates that after instruction verification, flexible resources are sent to nodes Injected active power; Indicates the first The active power of flexible resources under each node is adjusted according to the instructions; Indicates the upper limit of active output; Indicates the lower limit of active output;

[0047] Node Voltage Constraints

[0048]

[0049]

[0050] Where: Indicates the node after instruction verification Voltage; Indicates the nodes caused by the output of each flexible resource according to the verified instruction The voltage change is calculated by the voltage-active power sensitivity matrix; Indicates the upper limit of the node voltage; Indicates the lower limit of the node voltage;

[0051] Line power flow constraints

[0052]

[0053]

[0054] Where: Indicates the line after the instruction is verified and the flexible resource is outputting normally of merit; Indicates the lines caused by the output of each flexible resource according to the verified command The active power change is calculated by the line transmission power sensitivity; Indicates the circuit before instruction verification The absolute value of active power; Indicates the circuit after instruction verification The absolute value of active power.

[0055] The present invention combines voltage-active power sensitivity with line transmission power sensitivity to calculate the impact of flexible resource output on grid nodes and branch currents. On the premise of keeping the dispatching instructions of the upper-level grid unchanged as much as possible, the output of each flexible resource within the aggregate is adjusted to ensure that the voltage of each node does not exceed the limit, the current of the key branch does not exceed the limit, and the safety of the lower-level grid is ensured.

[0056] In a second aspect, the present invention provides a system for verifying the output of subordinate flexibility resources taking into account the dispatching instructions of the superior power grid, comprising:

[0057] Data acquisition and processing module: used to obtain the line parameters and topological characteristics of the distribution network, and calculate the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity; among which, the line parameters of the distribution network include line equivalent resistance, line equivalent inductance, and line equivalent ground admittance;

[0058] Verification and judgment module: used to calculate the output that needs to be adjusted by the flexible resources under the current instruction according to the dispatch instruction issued by the upper power grid; then, combined with the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity, simulate and calculate the voltage of each node in the distribution network and the flow of each branch; compare the calculation results of the voltage of each node in the distribution network and the flow of each branch with the instruction execution conditions to determine whether there is any over-limit of the node voltage or branch flow of the distribution network: if the node voltage or branch flow does not exceed the limit, there is no need to correct the dispatch instruction issued by the upper power grid this time, and the dispatch instruction is directly issued for execution; if there is any over-limit of the node voltage or branch flow, enter the instruction correction module;

[0059] Instruction correction module: It is used to take the minimum adjustment of the dispatching instruction as the objective function, and the flexible resource output constraint, node voltage safety constraint and line flow constraint as the constraint conditions, build a flexible resource instruction correction model and solve it through the solver to obtain the corrected flexible resource output result, and issue the corrected dispatching instruction for execution.

[0060] In a third aspect, the present invention provides an electronic terminal, comprising a processor and a memory, wherein the memory stores a computer program, and the processor calls the computer program to execute the steps of the above method.

[0061] In a fourth aspect, the present invention provides a readable storage medium storing a computer program, wherein the computer program is used to execute the steps of the method described above when called by a processor.

[0062] The present invention proposes a method for verifying the output of subordinate flexibility resources taking into account the dispatching instructions of the superior power grid, and the method has the following advantages:

[0063] 1. Since the upper power grid accurately issues dispatching instructions to each flexible resource, the dispatching instructions of each flexible resource will change after verification. The present invention comprehensively considers the voltage-active power sensitivity and the line transmission power sensitivity to calculate the voltage increment of each node of the distribution network and the power flow increment of each branch caused by the output change of each flexible resource after verification.

[0064] 2. Taking the minimum adjustment of dispatching instructions as the objective function, and taking the output of flexible resources, voltage safety of distribution network, and power flow safety as constraints, a dispatching instruction correction model is constructed. The output of each flexible resource is effectively adjusted to solve the safety problems of the lower-level power grid caused by the upper-level power grid control instructions. BRIEF DESCRIPTION OF THE DRAWINGS

[0065] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0066] Figure 1 It is a flow chart of a method for verifying the output of subordinate flexibility resources taking into account the dispatching instructions of the superior power grid provided in an embodiment of the present invention. DETAILED DESCRIPTION

[0067] To make the purpose, technical solution and advantages of the present invention clearer, the technical solution of the present invention will be described in detail below. Obviously, the described embodiments are only part of the embodiments of the present invention, rather than all the embodiments. Based on the embodiments of the present invention, all other implementation methods obtained by ordinary technicians in this field without creative work belong to the scope of protection of the present invention.

[0068] Example 1

[0069] like Figure 1 The present embodiment provides a method for verifying the output of subordinate flexibility resources taking into account the dispatching instructions of the superior power grid, including:

[0070] S1: Obtain the line parameters and topological characteristics of the distribution network, and calculate the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity; wherein the line parameters of the distribution network include line equivalent resistance, line equivalent inductance, and line equivalent ground admittance.

[0071] Specifically, S11: collect the line equivalent resistance, line equivalent inductance, and line equivalent ground admittance between each bus node of the distribution network, and then calculate and construct the Jacobian matrix; the inversion of the Jacobian matrix is ​​the voltage-power sensitivity matrix between the bus nodes, which represents the influence of the active and reactive power changes of the bus nodes on the voltage amplitude and phase angle. The expression of the voltage-power sensitivity matrix between each bus node is:

[0072]

[0073] Where: Represents the phase angle of each node in the distribution network; Indicates the voltage of each node in the distribution network; represents the active power injected into the node; represents the reactive power injected into the node; Indicates the change of phase angle of each node in the distribution network; Indicates the change of voltage at each node of the distribution network; Indicates the change of active power of each node in the distribution network; Indicates the change of reactive power of each node in the distribution network; It is the sensitivity factor reflecting the node voltage change caused by the active power change of the node; It is a sensitivity factor that reflects the node voltage change caused by the node's reactive power change.

[0074] S12: Consider only the influence of active power regulation on node voltage and branch power flow, divide the Jacobian inverse matrix into blocks, and extract The sub-array is the voltage-power sensitivity matrix between each bus node, which is used to measure the impact of active power changes on node voltage; the expression of the voltage-active power sensitivity matrix between each bus node is:

[0075]

[0076]

[0077] Where: Indicates The voltage change of each node; Indicates The active power of the flexible resources under each node is adjusted according to the instructions; is the voltage-active power sensitivity factor, reflecting the The active power change of each node leads to The voltage change of each node; is the number of nodes in the distribution network;

[0078] S13: According to the topological connection relationship between the nodes of the distribution network, the line transmission power sensitivity matrix is ​​obtained to measure the impact of active power changes on branch power flows; the expression of the line transmission power sensitivity matrix between each bus node and each branch is:

[0079]

[0080]

[0081]

[0082] Where: Indicates Changes in active power flowing through the lines; is the line transmission power sensitivity factor, reflecting the The active power change of each node leads to Power variation of the lines; is the number of lines in the distribution network; For line Active power of For line Reactive power; Representation Node The set of lines passing through to the root node of the distribution network; Representation Node To line The set of lines that the head-end node passes through; Representation Node With Node The lines between.

[0083] S2: According to the dispatching instruction issued by the upper power grid, calculate the output that needs to be adjusted by the flexible resources under the current instruction; then combine the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity to simulate and calculate the voltage of each node and the power flow of each branch of the distribution network; compare the calculation results of the voltage of each node and the power flow of each branch of the distribution network with the instruction execution conditions to determine whether there is any over-limit of the node voltage or branch power flow of the distribution network: if there is no over-limit of the node voltage or branch power flow, there is no need to correct the dispatching instruction issued by the upper power grid this time, and directly issue the execution dispatching instruction; if there is any over-limit of the node voltage or branch power flow, enter S3;

[0084] Specifically, the calculation formula for the output that needs to be adjusted by the flexibility resource under the current instruction in S2 is:

[0085]

[0086] Where: Indicates the current instruction to the node Injected active power; Indicates that the flexible resource is delivering power to the node normally. Injected active power; Indicates the current instruction The active power of flexible resources under each node is adjusted according to the instructions.

[0087] The calculation formula for the voltage of each node in the distribution network and the power flow of each branch in S2 is:

[0088] Node voltage calculation

[0089]

[0090] Where: Indicates the node under the current instruction Voltage; Indicates the node when the flexible resource is working normally Voltage; Indicates the nodes caused by the output of each flexible resource according to the current instruction Voltage changes;

[0091] Line flow calculation

[0092]

[0093] Where: Indicates the current command line Active power of Indicates the line when the flexible resource is working normally Active power of Indicates the lines caused by the output of each flexible resource according to the current instruction Active power changes.

[0094] The specific process of comparing the calculation result with the instruction execution condition in S2 to determine whether the limit is exceeded is:

[0095] If the node voltage or line flow does not meet the instruction execution condition, it is determined to be out of limit, otherwise it is not out of limit; the instruction execution condition is specifically:

[0096]

[0097]

[0098] Where: Indicates the upper limit of the node voltage; Indicates the lower limit of the node voltage; Indicates line The upper and lower limits of the specific node voltage and the setting of the branch flow can be adjusted according to the actual scenario and are not limited thereto. In this embodiment, the node voltage safety condition is 0.95-1.05, and the branch flow is less than or equal to its thermal limit.

[0099] After obtaining the node voltage and line flow, the flexible resource command is checked. If the node voltage or line flow does not exceed the limit, it means that the control command of the flexible resource will not cause safety problems for the lower-level power grid, and the control command is issued reasonably; if the node voltage or line flow exceeds the limit, it will affect the safety of the lower-level power grid. This means that the control command is not issued reasonably and needs to be adjusted.

[0100] S3: Taking the minimum adjustment of the dispatch instruction as the objective function, and the flexible resource output constraint, node voltage safety constraint and line flow constraint as the constraint conditions, a flexible resource instruction correction model is constructed and solved by the solver to obtain the corrected flexible resource output result, and the corrected dispatch instruction is issued for execution.

[0101] Specifically, the objective function is:

[0102]

[0103] Where: Respectively represent the order before and after the verification The active power of the flexible resources under each node is adjusted according to the instructions.

[0104] The flexible resource output constraints, node voltage safety constraints and line flow constraints in S3 are specifically:

[0105] Flexible resource output constraints

[0106]

[0107]

[0108] In the formula Indicates that after instruction verification, flexible resources are sent to nodes Injected active power; Indicates the first The active power of flexible resources under each node is adjusted according to the instructions; Indicates the upper limit of active output; Indicates the lower limit of active output;

[0109] Node Voltage Constraints

[0110]

[0111]

[0112] Where: Indicates the node after instruction verification Voltage; Indicates the nodes caused by the output of each flexible resource according to the verified instruction The voltage change is calculated by the voltage-active power sensitivity matrix; Indicates the upper limit of the node voltage; Indicates the lower limit of the node voltage;

[0113] Line power flow constraints

[0114]

[0115]

[0116] Where: Indicates the line after the instruction is verified and the flexible resource is outputting normally of merit; Indicates the lines caused by the output of each flexible resource according to the verified command The active power change is calculated by the line transmission power sensitivity; Indicates the circuit before instruction verification The absolute value of active power; Indicates the circuit after instruction verification The absolute value of active power.

[0117] During the specific implementation, a program is written on MATLAB, the objective function and constraints are written into the program, and the solver is called to obtain the corrected flexible resource output result, that is, the corrected scheduling instruction. The solver can be selected according to actual needs. The solver in this embodiment uses the gurobi solver.

[0118] This embodiment combines the voltage-active power sensitivity and the line transmission power sensitivity to calculate the impact of flexible resource output on grid nodes and branch currents. On the premise of keeping the dispatching instructions of the upper-level grid unchanged as much as possible, the output of each flexible resource within the aggregate is adjusted to ensure that the voltage of each node does not exceed the limit and the current of the key branch does not exceed the limit, thereby ensuring the safety of the lower-level grid.

[0119] Example 2

[0120] This embodiment provides a lower-level flexibility resource output verification system considering the upper-level power grid dispatching instructions, including:

[0121] Data acquisition and processing module: used to obtain the line parameters and topological characteristics of the distribution network, and calculate the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity; among which, the line parameters of the distribution network include line equivalent resistance, line equivalent inductance, and line equivalent ground admittance;

[0122] Verification and judgment module: used to calculate the output that needs to be adjusted by the flexible resources under the current instruction according to the dispatch instruction issued by the upper power grid; then, combined with the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity, simulate and calculate the voltage of each node in the distribution network and the power flow of each branch; compare the calculation results of the voltage of each node in the distribution network and the power flow of each branch with the instruction execution conditions to determine whether there is any over-limit of the node voltage or branch power flow in the distribution network: if there is no over-limit of the node voltage or branch power flow, there is no need to correct the dispatch instruction issued by the upper power grid this time, and the dispatch instruction is directly issued for execution; if there is any over-limit of the node voltage or branch power flow, enter the instruction correction module;

[0123] Instruction correction module: It is used to take the minimum adjustment of the dispatch instruction as the objective function, and the flexible resource output constraint, node voltage safety constraint and line flow constraint as the constraint conditions, build a flexible resource instruction correction model and solve it through the solver, obtain the corrected flexible resource output result, and issue the final dispatch instruction for execution.

[0124] Example 4

[0125] This embodiment provides an electronic terminal, including a processor and a memory, wherein the memory stores a computer program, and the processor calls the computer program to execute the steps of the above method.

[0126] Example 5

[0127] This embodiment provides a readable storage medium storing a computer program, and when the computer program is called by a processor, the computer program executes the steps of the above method.

[0128] It should be understood that in the embodiments of the present invention, the processor may be a central processing unit (CPU), and the processor may also be other general-purpose processors, digital signal processors (DSP), application-specific integrated circuits (ASIC), field-programmable gate arrays (FPGA) or other programmable logic devices, discrete gates or transistor logic devices, discrete hardware components, etc. A general-purpose processor may be a microprocessor or the processor may also be any conventional processor, etc. The memory may include a read-only memory and a random access memory, and provide instructions and data to the processor. A portion of the memory may also include a non-volatile random access memory. For example, the memory may also store information about the type of device.

[0129] The readable storage medium is a computer-readable storage medium, which may be an internal storage unit of the controller described in any of the foregoing embodiments, such as a hard disk or memory of the controller. The readable storage medium may also be an external storage device of the controller, such as a plug-in hard disk, a smart memory card (Smart Media Card, SMC), a secure digital (Secure Digital, SD) card, a flash card (Flash Card), etc. equipped on the controller. Furthermore, the readable storage medium may also include both an internal storage unit of the controller and an external storage device. The readable storage medium is used to store the computer program and other programs and data required by the controller. The readable storage medium may also be used to temporarily store data that has been output or is to be output.

[0130] Based on this understanding, the technical solution of the present invention, in essence or in other words, the part that contributes to the prior art, or all or part of the technical solution can be embodied in the form of a software product, which is stored in a storage medium and includes several instructions for enabling a computer device (which can be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method described in each embodiment of the present invention. The aforementioned readable storage medium includes: U disk, mobile hard disk, read-only memory (ROM, Read-Only Memory), random access memory (RAM, Random Access Memory), disk or optical disk, etc., various media that can store program codes.

[0131] It can be understood that the same or similar parts of the above embodiments can be referenced to each other, and the contents not described in detail in some embodiments can refer to the same or similar contents in other embodiments.

[0132] Although the embodiments of the present invention have been shown and described above, it is to be understood that the above embodiments are exemplary and are not to be construed as limitations of the present invention. A person skilled in the art may change, modify, replace and vary the above embodiments within the scope of the present invention.

Claims

1. A method for verifying the output of subordinate flexibility resources considering the dispatching instructions of the superior power grid, characterized in that: include: S1: Obtain the line parameters and topological characteristics of the distribution network, and calculate the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity; wherein the line parameters of the distribution network include line equivalent resistance, line equivalent inductance, and line equivalent ground admittance; S2: According to the dispatching instruction issued by the upper power grid, calculate the output that needs to be adjusted by the flexible resources under the current instruction; then combine the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity to simulate and calculate the voltage of each node and the power flow of each branch of the distribution network; compare the calculation results of the voltage of each node and the power flow of each branch of the distribution network with the instruction execution conditions to determine whether there is any over-limit of the node voltage or branch power flow of the distribution network: if there is no over-limit of the node voltage or branch power flow, there is no need to correct the dispatching instruction issued by the upper power grid this time, and directly issue the execution dispatching instruction; if there is any over-limit of the node voltage or branch power flow, enter S3; S3: Taking the minimum adjustment of the dispatch instruction as the objective function, and the flexible resource output constraint, node voltage safety constraint and line flow constraint as the constraint conditions, a flexible resource instruction correction model is constructed and solved by the solver to obtain the corrected flexible resource output result, and the corrected dispatch instruction is issued for execution.

2. The method for verifying the output of lower-level flexible resources considering the dispatching instructions of the upper-level power grid according to claim 1 is characterized in that: The specific steps of S1 are: S11: Collect the line equivalent resistance, line equivalent inductance, and line equivalent ground admittance between each bus node of the distribution network, and then calculate and construct the Jacobian matrix; the inversion of the Jacobian matrix is ​​the voltage-power sensitivity matrix between the bus nodes; wherein, the expression of the voltage-power sensitivity matrix between each bus node is: ； Where: Represents the phase angle of each node in the distribution network; Indicates the voltage of each node in the distribution network; represents the active power injected into the node; represents the reactive power injected into the node; Indicates the change of phase angle of each node in the distribution network; Indicates the change of voltage at each node of the distribution network; Indicates the change of active power of each node in the distribution network; Indicates the change of reactive power of each node in the distribution network; It is the sensitivity factor reflecting the node voltage change caused by the active power change of the node; It is the sensitivity factor reflecting the node voltage change caused by the node reactive power change; S12: Consider only the influence of active power regulation on node voltage and branch power flow, divide the Jacobian inverse matrix into blocks, and extract The sub-array is the voltage-active power sensitivity matrix between each bus node; the expression of the voltage-active power sensitivity matrix between each bus node is: ； ； Where: Indicates The voltage change of each node; Indicates The active power of the flexible resources under each node is adjusted according to the instructions; is the voltage-active power sensitivity factor, reflecting the The active power change of each node leads to The voltage change of each node; is the number of nodes in the distribution network; S13: According to the topological connection relationship between each node of the distribution network, a line transmission power sensitivity matrix is ​​obtained; wherein the expression of the line transmission power sensitivity matrix between each bus node and each branch is: ； ； ； Where: Indicates Active power changes through the lines is the line transmission power sensitivity factor, reflecting the The active power change of each node leads to Power variation of the lines; is the number of lines in the distribution network; For Line Active power of For Line Reactive power; Representation Node The set of lines passing through to the root node of the distribution network; Representation Node To line The set of lines that the head-end node passes through; Representation Node With Node The lines between.

3. The method for verifying the output of subordinate flexibility resources considering the dispatching instructions of the superior power grid according to claim 1 is characterized in that: The calculation formula for the output that needs to be adjusted by the flexibility resource under the current instruction in S2 is: ； Where: Indicates the current instruction to the node Injected active power; Indicates that the flexible resource is delivering power to the node normally. Injected active power; Indicates the current instruction The active power of flexible resources under each node is adjusted according to the instructions.

4. The method for verifying the output of lower-level flexible resources considering the dispatching instructions of the upper-level power grid according to claim 1 is characterized in that: The calculation formula for the voltage of each node in the distribution network and the power flow of each branch in S2 is: Node voltage calculation ； Where: Indicates the node under the current instruction Voltage; Indicates the node when the flexible resource is working normally Voltage; Indicates the nodes caused by the output of each flexible resource according to the current instruction Voltage changes; Line flow calculation ； Where: Indicates the current command line Active power of Indicates the line when the flexible resource is working normally Active power of Indicates the lines caused by the output of each flexible resource according to the current instruction Active power changes.

5. The method for verifying the output of lower-level flexible resources considering the dispatching instructions of the upper-level power grid according to claim 1 is characterized in that: The specific process of comparing the calculation result with the instruction execution condition in S2 to determine whether the limit is exceeded is: If the node voltage or line flow does not meet the instruction execution condition, it is determined to be out of limit, otherwise it is not out of limit; the instruction execution condition is specifically: ； ； Where: Indicates the upper limit of the node voltage To indicate the node under the current instruction Voltage; Indicates the lower limit of the node voltage; For flexible resources, the line is normally output Active power of Indicates line Rated power.

6. The method for verifying the output of lower-level flexible resources considering the dispatching instructions of the upper-level power grid according to claim 1 is characterized in that: The objective function in S3 is: ； Where: Respectively represent the order before and after the verification The active power of the flexible resources under each node is adjusted according to the instructions.

7. The method for verifying the output of lower-level flexibility resources considering the dispatching instructions of the upper-level power grid according to claim 1 is characterized in that: The flexible resource output constraints, node voltage safety constraints and line flow constraints in S3 are specifically: Flexible resource output constraints ； ； Where: Indicates that after instruction verification, flexible resources are sent to nodes Injected active power; Indicates the first The active power of flexible resources under each node is adjusted according to the instructions; Indicates the upper limit of active output; Indicates the lower limit of active output; Node Voltage Constraints ； ； Where: Indicates the node after instruction verification Voltage; Indicates the nodes caused by the output of each flexible resource according to the verified instruction The voltage change is calculated by the voltage-active power sensitivity matrix; Indicates the upper limit of the node voltage; Indicates the lower limit of the node voltage; Line power flow constraints ； ； Where: Indicates the line after the instruction is verified and the flexible resource is outputting normally of merit; Indicates the lines caused by the output of each flexible resource according to the verified command The active power change is calculated by the line transmission power sensitivity; Indicates the circuit before instruction verification The absolute value of active power; Indicates the circuit after instruction verification The absolute value of active power.

8. The lower-level flexibility resource output verification system considering the upper-level power grid dispatching instructions according to claim 1 is characterized in that: include: Data acquisition and processing module: used to obtain the line parameters and topological characteristics of the distribution network, and calculate the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity; among which, the line parameters of the distribution network include line equivalent resistance, line equivalent inductance, and line equivalent ground admittance; Verification and judgment module: used to calculate the output that needs to be adjusted by the flexible resources under the current instruction according to the dispatch instruction issued by the upper power grid; then, combined with the voltage-active power sensitivity of each node in the distribution network and the line transmission power sensitivity, simulate and calculate the voltage of each node in the distribution network and the flow of each branch; compare the calculation results of the voltage of each node in the distribution network and the flow of each branch with the instruction execution conditions to determine whether there is any over-limit of the node voltage or branch flow of the distribution network: if the node voltage or branch flow does not exceed the limit, there is no need to correct the dispatch instruction issued by the upper power grid this time, and the dispatch instruction is directly issued for execution; if there is any over-limit of the node voltage or branch flow, enter the instruction correction module; Instruction correction module: It is used to take the minimum adjustment of the dispatch instruction as the objective function, and the flexible resource output constraint, node voltage safety constraint and line flow constraint as the constraint conditions, build a flexible resource instruction correction model and solve it through the solver, obtain the corrected flexible resource output result and calculate the voltage of each node and the flow of each branch of the distribution network after verification, and issue and execute the corrected dispatch instruction.

9. An electronic terminal, characterized in that: It comprises a processor and a memory, wherein the memory stores a computer program, and the processor calls the computer program to execute the steps of the method according to any one of claims 1 to 7.

10. A readable storage medium, characterized in that: A computer program is stored, and when the computer program is called by a processor, the computer program is used to execute: the steps of the method according to any one of claims 1 to 7.

Images