Automatic Generation Method, Device and Equipment for Power Flow Scenarios of Steady-State Control Strategy Verification Tasks

Abstract

The present application relates to a method, device and equipment for automatically generating a power flow scenario for a stability control strategy verification task. The method includes obtaining the adjustable devices and power parameters of a power system; calculating based on the active power parameters of key units and the active power parameters of adjustable units to obtain the capacity sharing adjustment ratio and the adjusted active power output of the adjustable units; judging whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system converges, obtaining the balancing node of the power system and the corresponding balancing power value, and judging whether the balancing node is out of limit according to the balancing power value; if the balancing node is not out of limit, obtaining the key nodes of the power system and the corresponding voltage parameters; if the voltage of the key nodes is out of limit, using the reactive power adjustment rule to perform capacity ratio allocation on the adjustable reactive power compensation devices, and outputting to generate the power flow scenario of the power system, solving the technical problem that it is difficult to generate the power flow scenario for the existing stability control strategy verification task.

Description

Technical Field

[0001] The present application relates to the technical field of power systems, and particularly relates to a method, device and equipment for automatically generating a power flow scenario for a stability control strategy verification task. Background Art

[0002] The security and stability control system (also known as the stability control system) plays an important role in ensuring the stability of the power system, improving the power transmission capacity of the power grid, especially in preventing large-scale cascading power outages in the power grid. At present, the power industry commonly deploys the stability control system in the way of "formulating offline and applying online". According to the offline stability control strategy, the power system stability control is triggered by the contingency set given by offline analysis, and specific control measures are taken through certain rules to prevent the power system from losing stability. The above contingency set is generally given by the second-level standard of the "Power System Security and Stability Guide" and other specifications of the dispatching department; how to judge whether a contingency has occurred from the operating state measurement and external communication, and how to form specific control commands from the contingency and the operating state are stipulated by the stability control strategy formulated by offline analysis. In other words, the stability control strategy can be regarded as a mapping from the state measurement and external communication to the control command. When not considering the actual external inputs at the device level such as measurement and communication and only considering the core logic, the stability control strategy can also be simply regarded as a mapping from the fault and the pre-fault operating state to the control command. The offline stability control strategy verification is to generate a verification scenario set in the input space of the above strategy mapping, simulate these scenarios on the power simulation system and apply the control obtained according to the strategy mapping, and then evaluate the effectiveness and sufficiency of the strategy from the response of the power system. When it is assumed that the system is in a steady state before the fault, it is necessary to generate the pre-fault operating state, that is, to generate the equilibrium point. Therefore, the first step is to generate the power flow scenario. Therefore, the generation of the power flow scenario is a fundamental problem in the offline stability control strategy verification. When the dimension of the strategy input space is high and the mapping from the input to the stability of the power system after control is complex, the efficient generation of the verification power flow scenario set is a necessary guarantee for the sufficiency of the stability control strategy verification.

[0003] In practice, power flow scenario generation usually starts from a small number of typical operating modes. According to the checking requirements of the stability control strategy, the power of specific sections is adjusted to obtain a specific power flow mode. The generated power flow scenarios need to meet four basic requirements. The first basic requirement is that the parameters and initial values of the given power flow scenario are convergent under the given algorithm tool. The second basic requirement is that the power of the key sections meets the settings of the stability control strategy checking. The calculation of the control quantity of the stability control strategy usually takes the power of one or some key sections as the key input. For example, for the stability control strategy for the tripping fault of some lines in the power transmission channel of a power source, the power Pdm of a certain section in the channel before the fault is usually taken as the input for calculating the control quantity. The common calculation formula is: required control quantity dP = K × (Pdm - Pb), where K is called the calculation coefficient of the required action quantity, and Pb is called the base value of the required action quantity. Selecting the power of the key sections as the input of the required control quantity is mainly because they can be measured conveniently and are often effective indicators of the stability degree after the system fault. Therefore, the power of the key sections is usually the dimension in the input space of the stability control strategy that represents the pre-fault operating state and has a direct impact on the control quantity, and thus is also the dimension for which the value needs to be set during power flow scenario generation. The third basic requirement is the resultant output of the balancing machines for the power flow solution. In a large interconnected AC / DC power grid, the power grid is divided into multiple regional synchronous grids. The exchanged power between regions needs to meet the actual section constraints. In addition, the active power within the region needs to be balanced, and the output of the balancing machines within the region cannot exceed the maximum output of the actual units. The fourth basic requirement is that the bus voltages of the convergent power flow solutions need to be within a reasonable range. For the purpose of stability control strategy checking, the voltage is usually set at a relatively low level within the safe range.

[0004] The process of starting from the data of typical operating modes and adjusting the scenario parameters to obtain the target power flow mode that meets the above four requirements takes a lot of time and energy of the stability control strategy professionals. Since the power flow of the power system may not converge under the given mode boundary conditions, or the power flow solutions such as the over-limit of the balancing machines and the over-limit of the node voltages often occur. To obtain a feasible solution, the current method in the power industry is to manually modify the generator output, reactive power compensation equipment, etc. according to manual experience to make the power flow calculation feasible.

[0005] With the development of technology and under the constraint of the "dual carbon" goal, in recent years, the proportion of new energy power and electricity has increased rapidly, bringing about the diversification of the power system operating modes and the complexity of the dynamic characteristics of the AC / DC system. The calculation amount and complexity of the formulation, evaluation, and checking of the actual large power grid stability control strategy have increased exponentially. The above method of manually modifying to obtain the target scenario based on manual experience has obviously become the efficiency bottleneck of the stability control strategy checking work, especially for the debugging of complex power flow scenarios involving large-scale adjustment of the power of regional AC / DC tie lines. Even experienced experts will inevitably spend a lot of time.

[0006] Therefore, it is urgent to introduce an automated method to improve the efficiency of off-line analysis of stability control strategies, so as to ensure the depth and completeness of the operation risk of the power system and the off-line analysis of control strategies under the background of "dual carbon". Obviously, the automation of power flow generation is the premise of the automation of off-line stability control analysis. However, a key bottleneck restricting the automation of power flow generation in stability control strategy verification is the power flow convergence under extreme operating scenario parameters. Improving power flow convergence is a fundamental issue in the field of power system calculation and analysis, and many general results have been obtained. In addition to expanding the convergence domain of the iterative format at the underlying numerical algorithm level or trying to adopt non-iterative algorithms, some engineering practical methods in the calculation process have also been proposed. For example, to improve power flow convergence, all PQ nodes in the power system are set as PV nodes, and then the nodes are gradually restored to PQ nodes; reselecting the balancing machine as an adjustment measure has also been proposed. The stability control verification calculation often needs to calculate extreme operating modes far from typical operating scenarios. If the initial values of typical operating modes are maintained, the power flow calculation often fails to converge.

[0007] The above methods can improve the power flow convergence in some specific cases, but are not sufficient to cope with the stability control verification tasks that require a large range of power flow scenarios to be generated. In recent years, machine learning technology has developed rapidly and is particularly good at solving tasks with rich empirical data but without explicit rules. Preliminary attempts have been made on the automatic adjustment of power flow calculation convergence based on knowledge experience and reinforcement learning. However, the algorithms based on reinforcement learning require a large number of sample supports. The stability control verification tasks need to generate extreme scenarios on the operation boundary, and these area samples are difficult to generate, so the applicability of machine learning generation methods is limited. Summary of the Invention

[0008] The embodiments of the present application provide a method, device and equipment for automatically generating power flow scenarios for stability control strategy verification tasks, which are used to solve the technical problem that it is difficult to generate power flow scenarios for existing stability control strategy verification tasks.

[0009] To achieve the above object, the embodiments of the present application provide the following technical solutions:

[0010] A method for automatically generating power flow scenarios for stability control strategy verification tasks includes the following steps:

[0011] S1. Obtain the adjustable devices and power parameters of the power system. The adjustable devices include key units, adjustable units and adjustable reactive power compensation devices. The power parameters include the active power parameters of key units, the reactive power parameters of key units, the active power parameters of adjustable units, the reactive power parameters of adjustable units, and the reactive power parameters of adjustable reactive power compensation devices;

[0012] S2. Calculate according to the active power parameters of key units and the active power parameters of adjustable units to obtain the capacity sharing adjustment ratio and adjusted active power output of adjustable units;

[0013] S3. Determine whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system does not converge, obtain the key section of the power system, set PV nodes at the end nodes in the active power direction of the key section, and recalculate the power flow of the power system until the power flow of the power system converges;

[0014] S4. If the power flow of the power system converges, obtain the balancing node of the power system and the corresponding balancing power value, and determine whether the balancing node is out of limit according to the balancing power value;

[0015] S5. If the balancing node is not out of limit, obtain the key nodes of the power system and the corresponding voltage parameters, and determine whether the voltage of the key nodes is out of limit according to the voltage parameters;

[0016] S6. If the voltage of the key nodes is out of limit, allocate the capacity ratio of the adjustable reactive power compensation equipment according to the reactive power adjustment rule, and output and generate the power flow scenario of the power system.

[0017] Preferably, the calculation based on the active power parameters of the key units and the active power parameters of the adjustable units to obtain the capacity sharing adjustment ratio and the adjusted active power output of the adjustable units includes:

[0018] Obtain the transmission loss of the power system, the initial balancing power value, and the base state output and active power output of the active power parameters of all key units;

[0019] Calculate according to the transmission loss, the base state output and active power output of the active power parameters of all key units to obtain the initial value of the active power output gap of the adjustable units;

[0020] Perform iterative calculation according to the initial balancing power value and the initial value of the active power output gap to obtain the adjusted active power output gap value;

[0021] Calculate according to the adjusted active power output gap value, the base state output, output upper limit, and output lower limit of the active power parameters of the adjustable units to obtain the capacity sharing adjustment ratio and the adjusted active power output of the adjustable units.

[0022] Preferably, allocating the capacity ratio of the adjustable reactive power compensation equipment according to the reactive power adjustment rule includes:

[0023] Obtain the reactive voltage sensitivity parameters of the power system, the initial voltage out-of-limit value, and the current voltage amplitude, voltage upper limit value, and voltage lower limit value of the voltage parameters;

[0024] Calculate according to the reactive voltage sensitivity parameter, the current voltage amplitude, the voltage upper limit value, and the voltage lower limit value to obtain an initial value of the reactive power output gap of the adjustable units.

[0025] Perform iterative calculation according to the initial voltage over-limit value and the initial value of the reactive power output gap to obtain an adjusted reactive power output gap value.

[0026] Calculate according to the adjusted reactive power output gap value, the base-state output, output upper limit, and output lower limit of the reactive power parameters in the adjustable units to obtain the sharing adjustment ratio and adjusted reactive power output of the adjustable reactive power compensation equipment.

[0027] Preferably, the method for automatically generating a power flow scenario for the steady-state control strategy verification task includes: if the power flow of the power system does not converge, obtain the key sections of the power system, set PV nodes at the end nodes in the active power direction of the key sections, and re-judge whether the power flow of the power system converges according to steps S1 to S3.

[0028] Preferably, the method for automatically generating a power flow scenario for the steady-state control strategy verification task includes: if the equilibrium node is over-limit, return to step S1 again.

[0029] Preferably, the method for automatically generating a power flow scenario for the steady-state control strategy verification task includes: if the voltage of the key node is not over-limit, output and generate a power flow scenario of the power system.

[0030] This application also provides a device for automatically generating a power flow scenario for a steady-state control strategy verification task, including a parameter acquisition module, a calculation module, a convergence judgment module, a voltage parameter acquisition module, and a power flow generation module;

[0031] The parameter acquisition module is used to acquire the adjustable devices and power parameters of the power system. The adjustable devices include key units, adjustable units, and adjustable reactive power compensation equipment. The power parameters include the active power parameters of the key units, the reactive power parameters of the key units, the active power parameters of the adjustable units, the reactive power parameters of the adjustable units, and the reactive power parameters of the adjustable reactive power compensation equipment;

[0032] The calculation module is used to calculate according to the active power parameters of the key units and the active power parameters of the adjustable units to obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable units;

[0033] The convergence judgment module is used to judge whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system does not converge, obtain the key section of the power system, set PV nodes at the end nodes of the active power direction of the key section, and recalculate the power flow of the power system until the power flow of the power system converges; if the power flow of the power system converges, obtain the balancing node of the power system and the corresponding balancing power value, and judge whether the balancing node is out of limit according to the balancing power value;

[0034] The voltage parameter acquisition module is used to obtain the key nodes of the power system and the corresponding voltage parameters according to the non-out-of-limit of the balancing node, and judge whether the voltage of the key nodes is out of limit according to the voltage parameters;

[0035] The power flow generation module is used to proportionally allocate the capacity of the adjustable reactive power compensation equipment according to the voltage limit of the key nodes by using the reactive power adjustment rule, and output and generate the power flow scenario of the power system.

[0036] Preferably, the calculation module includes a data acquisition sub-module, a first calculation sub-module, a second calculation sub-module, and a third calculation sub-module;

[0037] The data acquisition sub-module is used to obtain the transmission loss of the power system, the initial balancing power value, and the base state output and active power output of the active power parameters of all key units;

[0038] The first calculation sub-module is used to calculate according to the transmission loss, the base state output and active power output of the active power parameters of all key units, and obtain the initial value of the active power output gap of the adjustable units;

[0039] The second calculation sub-module is used to perform iterative calculation according to the initial balancing power value and the initial value of the active power output gap, and obtain the adjusted active power output gap value;

[0040] The third calculation sub-module is used to calculate according to the adjusted active power output gap value, the base state output, output upper limit, and output lower limit of the active power parameters of the adjustable units, and obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable units.

[0041] Preferably, the power flow generation module includes a voltage parameter acquisition sub-module, a fourth calculation sub-module, a fifth calculation sub-module, and a sixth calculation sub-module;

[0042] The voltage parameter acquisition sub-module is used to obtain the reactive voltage sensitivity parameter of the power system, the initial voltage limit value, and the current voltage amplitude, voltage upper limit value, and voltage lower limit value of the voltage parameters;

[0043] The fourth calculation sub-module is configured to calculate, based on the reactive voltage sensitivity parameter, the current voltage amplitude, the voltage upper limit value, and the voltage lower limit value, to obtain an initial value of the reactive power output gap of the adjustable units.

[0044] The fifth calculation sub-module is configured to perform iterative calculations based on the initial voltage over-limit value and the initial value of the reactive power output gap to obtain an adjusted reactive power output gap value.

[0045] The sixth calculation sub-module is configured to calculate, based on the adjusted reactive power output gap value, the base-state output, the output upper limit, and the output lower limit of the reactive power parameters in the adjustable units, to obtain the sharing adjustment ratio and the adjusted reactive power output of the adjustable reactive power compensation devices.

[0046] This application also provides a storage device, in which multiple program codes are stored, and the program codes are adapted to be loaded and run by a processor to execute the method for automatically generating a power flow scenario of the above-mentioned steady-state control strategy verification task.

[0047] This application also provides a terminal device, including a processor and a memory;

[0048] The memory is configured to store the program code and transmit the program code to the processor;

[0049] The processor is configured to execute the method for automatically generating a power flow scenario of the above-mentioned steady-state control strategy verification task according to the instructions in the program code.

[0050] As can be seen from the above technical solutions, the embodiments of the present application have the following advantages: The method, device, and equipment for automatically generating power flow scenarios for the stability control strategy verification task. The method includes obtaining the adjustable devices and power parameters of the power system; calculating based on the active power parameters of the key units and the active power parameters of the adjustable units to obtain the capacity sharing adjustment ratio and the adjusted active power output of the adjustable units; judging whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system converges, obtaining the balance node of the power system and the corresponding balance power value, and judging whether the balance node is out of limit according to the balance power value; if the balance node is not out of limit, obtaining the key nodes of the power system and the corresponding voltage parameters; if the voltage of the key node is out of limit, using the reactive power adjustment rule to allocate the capacity ratio of the adjustable reactive power compensation equipment, and outputting to generate the power flow scenario of the power system. The method for automatically generating power flow scenarios for the stability control strategy verification task can replace most of the manual power flow scenario debugging processes in the stability control strategy verification calculation, greatly improving the offline analysis efficiency of the stability control strategy. Especially for the extreme operation scenarios that need to be generated for the stability control strategy verification, compared with the methods for generally improving the convergence of power flow solutions, it has significant pertinence, relatively low engineering implementation difficulty, and remarkable improvement in reliability and efficiency, solving the technical problem that it is difficult to generate power flow scenarios for the existing stability control strategy verification tasks. BRIEF DESCRIPTION OF THE DRAWINGS

[0051] In order to more clearly illustrate the technical solutions in the embodiments of the present application or the prior art, the following will briefly introduce the drawings required for the description of the embodiments or the prior art. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can also be obtained based on these drawings.

[0052] Figure 1 It is a flowchart of the steps of the method for automatically generating power flow scenarios for the stability control strategy verification task described in the embodiments of the present application;

[0053] Figure 2 It is a topological structure diagram of the thermal power and wind power bundled transmission system for the method for automatically generating power flow scenarios for the stability control strategy verification task described in the embodiments of the present application;

[0054] Figure 3 It is a schematic diagram of the distribution of the power flow scenarios generated by the full wiring of the thermal power and wind power bundled transmission system for the method for automatically generating power flow scenarios for the stability control strategy verification task described in the embodiments of the present application;

[0055] Figure 4 It is a schematic diagram of the distribution of the power flow scenarios generated by the section wiring maintenance of the thermal power and wind power bundled transmission system for the method for automatically generating power flow scenarios for the stability control strategy verification task described in the embodiments of the present application;

[0056] Figure 5 This is a framework diagram of the automatic generation device for power flow scenarios of the stability control strategy verification task in the embodiments of the present application. Detailed implementation manners

[0057] In order to make the invention objectives, features, and advantages of the present application more obvious and understandable, the technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the accompanying drawings in the embodiments of the present application. Obviously, the embodiments described below are only a part of the embodiments of the present application, rather than all embodiments. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts shall fall within the protection scope of the present application.

[0058] The embodiments of the present application provide an automatic generation method, device, and equipment for power flow scenarios of stability control strategy verification tasks, which are used to solve the technical problem that it is difficult to generate power flow scenarios for existing stability control strategy verification tasks.

[0059] Embodiment 1:

[0060] Figure 1 This is a step flowchart of the automatic generation method for power flow scenarios of the stability control strategy verification task described in the embodiments of the present application.

[0061] As Figure 1 shown, the embodiments of the present application provide an automatic generation method for power flow scenarios of stability control strategy verification tasks, including the following steps:

[0062] S1. Obtain the adjustable devices and power parameters of the power system. The adjustable devices include key units, adjustable units, and adjustable reactive power compensation devices. The power parameters include the active power parameters of the key units, the reactive power parameters of the key units, the active power parameters of the adjustable units, the reactive power parameters of the adjustable units, and the reactive power parameters of the adjustable reactive power compensation devices.

[0063] It should be noted that in step S1, the main task is to obtain the parameter adjustment equipment and power parameters of the power system, and then adjust the active power according to the parameter adjustment equipment and power parameters. Based on the active power adjustment, it is determined whether the power system's flow has converged, and the non-convergence of the flow is processed. For the power system with converged flow, the flow scenario is generated after reactive power adjustment. In this embodiment, the key section of the stability control strategy verification divides the units (such as generators) in the power system into two groups, one of which is a group of units whose output will increase the positive active flow of the section and is called a key unit (KG). The change in the key corrective output requires the power of other units in the power system to be adjusted accordingly to balance it. When the initial operating mode is known and the operating topology is determined, the change in the output of the key unit can be calculated, and the active output of other units can be adjusted according to the change to ensure the active power balance of the power system, so that the flow calculation can obtain a solution that is easy to converge. When the power flow calculation converges, the active output of the balancing node can be obtained from the power flow solution. When the active output of the balancing node exceeds the actual balancing output constraint, it means that the operation mode is not feasible and other units are needed to share the excess output power of the units in the balancing node. The active power of other units can be further adjusted until the active output of the balancing node meets the balancing output constraint.

[0064] In the embodiment of the present application, the automatic generation method of the power flow scenario of the stability control strategy verification task adopts the parameter adjustment unit selection model to obtain the parameter adjustment unit of the power system. Among them, the parameter adjustment unit selection model is:

[0065]

[0066] Where KG is the sequence number set of key units, with the subscript j representing the sequence number of the key unit, AG is the sequence number set of parameter units, with the subscript i representing the sequence number of the parameter unit, Si is the electrical distance between the i-th parameter unit and the key section, n(AG) is the total number of parameter units, δ is the active power calculation margin of the power system, and P i max is the upper limit of active power output of the i-th parameterized unit, P i min is the lower limit of active power output of the i-th parameterized unit, P i base is the active base state output of the i-th parameterized unit; P j max is the upper limit of active power output of the jth key unit, P j min is the lower limit of active power output of the jth key unit, P j baseis the active power base output of the j-th key unit. For the regional large system, δ can be taken as 500MW. The inequality constraints in the participating unit selection model are to ensure that the total upward and downward regulation reserves of the participating unit group meet the power change range of the key section. Among them, the active power parameters of the key units and the active power parameters of the participating units both include the active power base output, the lower limit of the active power output, and the upper limit of the active power output.

[0067] It should be noted that the method for automatically generating the power flow scenario of this stability control strategy verification task selects the units with a short electrical distance from the key section as the participating units, ensuring that the output change of the key units only affects the power flow distribution in a small range and has little impact on the operation characteristics of the entire power system. There are various feasible definitions of electrical distance. For example, the reciprocal of the sensitivity of the key section power to the unit power.

[0068] In the embodiment of the present application, the method for automatically generating the power flow scenario of this stability control strategy verification task uses the participating reactive power compensation equipment selection model to obtain the participating units of the power system. Among them, the participating reactive power compensation equipment selection model is:

[0069]

[0070] In the formula, AC is the set of serial numbers of the participating reactive power compensation equipment, and the serial number of the participating reactive power compensation equipment is represented by the subscript n. S′ n is the electrical distance between the n-th participating reactive power compensation equipment and the key node (the reciprocal of the reactive power sensitivity of the key node voltage to the participating reactive power compensation equipment can be used as the electrical distance), n(AC) is the total number of participating reactive power compensation equipment, δ′ is the reactive power calculation margin of the power system, is the upper limit of the reactive power output of the n-th participating reactive power compensation equipment, is the lower limit of the reactive power output of the n-th participating reactive power compensation equipment, is the reactive power base output of the n-th participating reactive power compensation equipment; is the upper limit of the reactive power output of the j-th key unit, is the lower limit of the reactive power output of the j-th key unit, is the reactive power base output of the j-th key unit, is the reactive power base output of the key node. Among them, for the 500kV main network, δ′ can be taken as 200MVar. The reactive power parameters of the participating reactive power compensation equipment and the reactive power parameters of the participating units both include the lower limit of the reactive power output, the upper limit of the reactive power output, and the reactive power base output.

[0071] It should be noted that in the method for automatically generating power flow scenarios for the stability control strategy verification task, during the reactive power adjustment process, in order to facilitate the adjustment of the regional voltage of the power system, the end node of the active power direction in the key section is selected as the key node KB, and the task of adjusting the regional voltage is transformed into the task of adjusting the voltage of the key node. In this embodiment, the general principle of the reactive power compensation equipment participating in the adjustment is local compensation. Therefore, the reactive power compensation equipment AC participating in the adjustment should be selected according to the electrical distance from the key node.

[0072] S2. Calculate based on the active power parameters of the key units and the active power parameters of the units participating in the adjustment to obtain the capacity sharing adjustment ratio and the adjusted active power output of the units participating in the adjustment.

[0073] It should be noted that in step S2, the capacity sharing adjustment ratio and the adjusted active power output of the units participating in the adjustment are mainly calculated based on the active power parameters of the key units and the active power parameters of the units participating in the adjustment obtained in step S1.

[0074] Furthermore, calculating based on the active power parameters of the key units and the active power parameters of the units participating in the adjustment to obtain the capacity sharing adjustment ratio and the adjusted active power output of the units participating in the adjustment includes:

[0075] Obtain the transmission loss of the power system, the initial balance power value, and the base state output and active power output of the active power parameters of all key units;

[0076] Calculate based on the transmission loss, the base state output and active power output of the active power parameters of all key units to obtain the initial value of the active power output gap of the units participating in the adjustment;

[0077] Perform iterative calculation based on the initial balance power value and the initial value of the active power output gap to obtain the adjusted active power output gap value;

[0078] Calculate based on the adjusted active power output gap value, the base state output, output upper limit, and output lower limit of the active power parameters of the units participating in the adjustment to obtain the capacity sharing adjustment ratio and the adjusted active power output of the units participating in the adjustment.

[0079] It should be noted that the method for automatically generating power flow scenarios for the stability control strategy verification task uses the first initial value calculation formula to calculate the initial value of the active power output gap of the units participating in the adjustment Among them, the first initial value calculation formula is: In the formula, P j is the active power output of the jth key unit in the current power flow scenario, and σ is the transmission loss of the line transmission in the power system. In this embodiment, the initial value of the active power output gap of the units participating in the adjustment It can also be the total change in the active power output of the adjustable generator relative to the base-state output. In the stability control verification task, according to different stability problems targeted by the stability control strategy, the active power output of key units in the power flow scenario can be specified. σ is used to estimate the network loss to improve the convergence of the power flow calculation. The value of σ is set according to the requirements of the power system and is not specifically limited here.

[0080] In the embodiment of the present application, the method for automatically generating the power flow scenario of the stability control strategy verification task is based on the initial balance power value and the initial value of the active power output gap Calculated using the first iterative formula to obtain the adjusted active power output gap value for each iterative calculation The first iterative formula is:

[0081]

[0082] In the formula, the superscript k represents the iteration number of adjusting the output of the adjustable unit, is the adjusted active power output gap value in the power system for the k-th iteration, is the balance power value for the k-th iteration. Since the goal of the iteration is not to obtain the output of the adjustable unit with a strict over-limit value of 0, the termination condition of the above iteration is where the initial balance power value is In this embodiment, the handling method for the case of going below the lower limit is the same as that for going above the upper limit.

[0083] In the embodiment of the present application, the method for automatically generating the power flow scenario of the stability control strategy verification task adjusts the active power output gap value and the base-state output, output upper limit, and output lower limit of the active power parameters in the adjustable units. The capacity sharing adjustment ratio and the adjusted active power output of the adjustable units are calculated using the adjustable unit adjustment formula. The adjustable unit adjustment formula is as follows:

[0084]

[0085]

[0086] In the formula, is the adjusted active power output of the i-th adjustable unit for the k-th adjustment, is the capacity sharing adjustment ratio of the i-th adjustable unit for the k-th adjustment.

[0087] S3. Determine whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system does not converge, obtain the key section of the power system, set PV nodes at the end nodes in the active power direction of the key section, and recalculate the power flow of the power system until the power flow of the power system converges; if the power flow of the power system converges, obtain the balance node of the power system and the balance power value corresponding to the balance node, and determine whether the balance node is over-limit according to the balance power value.

[0088] It should be noted that in step S3, the adjusted active power output is re-substituted into the power flow equation for solving the power flow of the power system analysis to determine whether the power flow of the power system converges. If the power flow of the power system converges, the balanced power value of the power system is obtained. Then, according to whether the balanced power value meets the actual balanced output constraint, if it meets, it indicates that the balanced node is not out of limit; if it does not meet, it indicates that the balanced node is out of limit. In this embodiment, the power flow equation for solving the power flow of the power system analysis is a very mature technology in this field and will not be elaborated here.

[0089] In the embodiment of the present application, when the active power of the critical section is close to the active power transmission bottleneck, even if the active power output of the participating regulating units is adjusted according to the initial value of the calculated active power output gap, it may still lead to non-convergence of the power flow. In such cases, the power flow scenario automatic generation method for the stability control strategy checking task sets the end node in the active power direction of the critical section as a PV node, fixes the receiving-end voltage of the critical section, and cooperates with the adjustment of the active power output of the participating regulating units to re-calculate the power flow. In this embodiment, choosing to set the end node as a PV node can fix the receiving-end voltage of the critical section and usually increase the transmission capacity, thereby increasing the static stability margin. After the power flow of the power system converges, after substituting the reactive power injected by the above PV node with reactive power compensation, the PV node is changed back to a PQ node. If the local reactive power of the critical node exceeds the equipment capacity, it is shared by nearby nodes. Among them, a PV node refers to a node where the active power P and voltage amplitude V are given, and the reactive power Q and voltage phase δ of the node are to be determined. Such nodes must have sufficient adjustable reactive power capacity to maintain the given voltage amplitude, and thus are also called voltage control nodes. A PQ node refers to a node where the active power P and reactive power Q are given, and the node voltage V and phase δ are to be determined. Usually, substations are this type of node; since there is no power generation equipment, the power generation power of the PQ node is zero.

[0090] S4. If the balanced node is not out of limit, obtain the critical nodes of the power system and the voltage parameters corresponding to the critical nodes, and determine whether the voltage of the critical nodes is out of limit according to the voltage parameters.

[0091] It should be noted that based on the situation where the balanced node is not out of limit, the critical nodes of the power system and the voltage parameters corresponding to the critical nodes are obtained, and then the power flow scenario automatic generation method for the stability control strategy checking task determines whether the voltage parameters are out of limit. In this embodiment, the critical node KB is the node at the end of the active power direction in the critical section of the power system. The voltage parameters include the current voltage amplitude voltage upper limit value and voltage lower limit value Among them, voltage out of limit means that the voltage exceeds the normal limit range, which is an abnormal situation, and can also be understood as being lower than the voltage lower limit value or higher than the voltage upper limit value.

[0092] S5. If the voltage of the key node exceeds the limit, the reactive power adjustment rule is used to allocate the capacity ratio of the reactive power compensation equipment to be adjusted, and the power flow scenario of the power system is output and generated.

[0093] Further, the capacity ratio allocation of the reactive power compensation equipment to be adjusted by using the reactive power adjustment rule includes:

[0094] Obtain the reactive power-voltage sensitivity parameter of the power system, the initial voltage limit value, and the current voltage amplitude, voltage upper limit value, and voltage lower limit value of the voltage parameter;

[0095] Calculate according to the reactive power-voltage sensitivity parameter, the current voltage amplitude, the voltage upper limit value, and the voltage lower limit value to obtain the initial value of the reactive power output gap of the unit to be adjusted;

[0096] Perform iterative calculation according to the initial voltage limit value and the initial value of the reactive power output gap to obtain the adjusted reactive power output gap value;

[0097] Calculate according to the adjusted reactive power output gap value and the base state output, output upper limit, and output lower limit of the reactive power parameter in the unit to be adjusted to obtain the sharing adjustment ratio and the adjusted reactive power output of the reactive power compensation equipment to be adjusted.

[0098] It should be noted that the reactive power-voltage sensitivity parameter includes the upper limit value k max of the reactive power-voltage sensitivity and the lower limit value k min of the reactive power-voltage sensitivity.

[0099] In the embodiment of the present application, the power flow scenario automatic generation method of the stability control strategy verification task calculates the initial value of the reactive power output gap of the unit to be adjusted by using the second initial value calculation formula The second initial value calculation formula is:

[0100]

[0101] In the embodiment of the present application, the power flow scenario automatic generation method of the stability control strategy verification task performs iterative calculation according to the initial voltage limit value and the initial value of the reactive power output gap

[0102]

[0103]

[0104] In the formula, the superscript k represents the iteration number of adjusting the reactive power output of the reactive power compensation equipment to be adjusted, is the adjusted reactive power output gap value in the power system at the kth iteration, is the voltage limit value of the key node in the k-th iteration. If the voltage is no longer out of limit, terminate the iteration.

[0105] In the embodiment of the present application, the method for automatically generating a power flow scenario for the stability control strategy verification task adjusts the reactive power output gap value, the base output, the upper output limit, and the lower output limit of the reactive power parameters in the participating adjustable units, and calculates the sharing adjustment ratio and the adjusted reactive power output of the participating adjustable reactive power compensation equipment by using the participating adjustable compensation equipment adjustment formula. Among them, the participating adjustable unit adjustment formula is:

[0106]

[0107]

[0108] In the formula, is the adjusted reactive power output of the n-th participating adjustable reactive power compensation equipment in the k-th adjustment, is the sharing adjustment ratio of the n-th participating adjustable reactive power compensation equipment in the k-th adjustment.

[0109] A method for automatically generating a power flow scenario for a stability control strategy verification task provided by the present application includes obtaining participating adjustable devices and power parameters of a power system; calculating based on the active power parameters of key units and the active power parameters of participating adjustable units to obtain the capacity sharing adjustment ratio and the adjusted active power output of the participating adjustable units; judging whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system converges, obtain the balance node of the power system and the corresponding balance power value, and judge whether the balance node is out of limit according to the balance power value; if the balance node is not out of limit, obtain the key nodes of the power system and the corresponding voltage parameters; if the voltage of the key node is out of limit, perform capacity ratio allocation on the participating adjustable reactive power compensation equipment by using the reactive power adjustment rule, and output and generate the power flow scenario of the power system. The method for automatically generating a power flow scenario for the stability control strategy verification task can replace most of the manual power flow scenario debugging processes in the stability control strategy verification calculation, greatly improve the off-line analysis efficiency of the stability control strategy, especially for the extreme operation scenarios that need to be generated for the stability control strategy verification. Compared with the method for generally improving the convergence of power flow solution, it has significant pertinence, relatively low engineering implementation difficulty, and remarkable improvement effects on reliability and efficiency, and solves the technical problem that it is difficult to generate the power flow scenario of the existing stability control strategy verification task.

[0110] It should be noted that the method for automatically generating a power flow scenario for the stability control strategy verification task automatically adjusts the operation mode according to the cross-section power requirements of the stability control strategy verification, and batch generates feasible power flow scenarios.

[0111] In an embodiment of the present application, the method for automatically generating a power flow scenario for the stability control strategy verification task includes: if the balance node is out of limit, return to step S1 again.

[0112] In one embodiment of the present application, the method for automatically generating a power flow scenario for a stability control strategy verification task includes: if the voltage of the key node is not out of limit, output and generate a power flow scenario of the power system.

[0113] Figure 2 This is the topological structure diagram of the wind-fire bundled power transmission system for the method of automatically generating a power flow scenario for the stability control strategy verification task of the embodiment of the present application. Figure 3 This is the schematic diagram of the distribution of the power flow scenario generated by the full connection of the wind-fire bundled power transmission system for the method of automatically generating a power flow scenario for the stability control strategy verification task of the embodiment of the present application. Figure 4 This is the schematic diagram of the distribution of the power flow scenario generated by the maintenance of the section connection of the wind-fire bundled power transmission system for the method of automatically generating a power flow scenario for the stability control strategy verification task of the embodiment of the present application.

[0114] In the embodiment of the present application, as Figure 2 shown, W represents a wind farm, and G represents a thermal power plant. When a fault occurs on the power transmission section of the power source, there are transient power angle stability and overload problems, and a certain amount of power sources need to be cut off to maintain the stability of the power grid. The stability control action quantity is mainly calculated from the power of the EH-WL section. Therefore, the EH-WL section is selected as the key section, and multiple values of the power of the EH-WL section are used to verify the setting value of the stability control system. The increase in the output of the thermal power plants YX, BH and the sea wind farms YY, PT, XY will significantly increase the power of the EH-WL section. Therefore, YX, BH, YY, PT, XYA, XYB are selected as the key units. The power of the EH-WL section needs to be verified within the value range of [3600, 6840]. The power of the section in the initial mode is 3519 MW. The EH node is selected as the key node, and the limit value of the voltage (per unit value) of the key node is set to [-0.05, 0.05]. The reactive power compensation equipment to be adjusted is set as the substations WZ, LD, YC, WL, EH.

[0115] Traverse the actual full connection and the EH-HL single-line maintenance operation domain in steps of 200 MW to obtain 268 operation modes. The adjustment and iteration times of each operation mode are obtained through the method for automatically generating a power flow scenario for the stability control strategy verification task. Figure 3 and Figure 4 shown in the power flow scenario distribution diagram. From Figure 3 and Figure 4It can be seen that the requirements can be met in the first iteration. After one adjustment iteration, in the full connection mode, 116 operating modes successfully meet the stable control verification requirements, and only 18 operating modes need further adjustment. In the connection mode with a single-line maintenance of the EH-WL section, all operating modes can be adjusted to meet the stable control verification requirements within 4 iterations. In the full connection mode, a total of 183 power flow calculations are required to adjust 134 operating modes, with a total time consumption of 1566 seconds and a single-mode adjustment time of 11.68 seconds; in the single-line maintenance connection mode, a total of 228 power flow calculations are performed to adjust 134 operating modes, with a total time consumption of 1856 seconds and a single-mode adjustment time of 13.58 seconds. For the actual large power system in the example, it is common for the time required for manual debugging of a power flow scenario in power system analysis to reach the minute level. In the above example, the automatic generation method of the power flow scenario for the stable control strategy verification task replaces manual work and significantly surpasses it in terms of efficiency.

[0116] Embodiment 2:

[0117] Figure 5 It is a framework diagram of an automatic power flow scenario generation device for the stable control strategy verification task of the present application embodiment.

[0118] As Figure 5 shown, the present application embodiment also provides an automatic power flow scenario generation device for the stable control strategy verification task, including a parameter acquisition module 10, a calculation module 20, a convergence judgment module 30, a voltage parameter acquisition module 40, and a power flow generation module 50;

[0119] The parameter acquisition module 10 is used to acquire the adjustable devices and power parameters of the power system. The adjustable devices include key units, adjustable units, and adjustable reactive power compensation devices. The power parameters include the active power parameters of key units, the reactive power parameters of key units, the active power parameters of adjustable units, the reactive power parameters of adjustable units, and the reactive power parameters of adjustable reactive power compensation devices;

[0120] The calculation module 20 is used to calculate based on the active power parameters of key units and adjustable units to obtain the capacity sharing adjustment ratio and adjusted active power output of adjustable units;

[0121] The convergence judgment module 30 is used to judge whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system does not converge, obtain the key section of the power system, set PV nodes at the end nodes in the active power direction of the key section, and recalculate the power flow of the power system until the power flow of the power system converges; if the power flow of the power system converges, obtain the balance node of the power system and the corresponding balance power value, and judge whether the balance node is out of limit according to the balance power value;

[0122] The voltage parameter acquisition module 40 is used to obtain the key nodes of the power system and the voltage parameters corresponding to the key nodes according to the non-exceedance of the balance node.

[0123] The power flow generation module 50 is used to allocate the capacity ratio of the adjustable reactive power compensation equipment according to the voltage violation of the key nodes by using the reactive power adjustment rule, and output the power flow scenario of the power system.

[0124] In the embodiment of the present application, the calculation module 20 includes a data acquisition sub-module, a first calculation sub-module, a second calculation sub-module, and a third calculation sub-module.

[0125] The data acquisition sub-module is used to obtain the transmission loss of the power system, the initial balance power value, and the base state output and active output of the active power parameters of all key units.

[0126] The first calculation sub-module is used to calculate according to the transmission loss, the base state output and the active output of the active power parameters of all key units to obtain the initial value of the active power output gap of the adjustable units.

[0127] The second calculation sub-module is used to perform iterative calculation according to the initial balance power value and the initial value of the active power output gap to obtain the adjusted active power output gap value.

[0128] The third calculation sub-module is used to calculate according to the adjusted active power output gap value, the base state output, the output upper limit, and the output lower limit of the active power parameters in the adjustable units to obtain the capacity sharing adjustment ratio and the adjusted active power output of the adjustable units.

[0129] In the embodiment of the present application, the power flow generation module 50 includes a voltage parameter acquisition sub-module, a fourth calculation sub-module, a fifth calculation sub-module, and a sixth calculation sub-module.

[0130] The voltage parameter acquisition sub-module is used to obtain the reactive voltage sensitivity parameter of the power system, the initial voltage violation value, and the current voltage amplitude, voltage upper limit value, and voltage lower limit value of the voltage parameter.

[0131] The fourth calculation sub-module is used to calculate according to the reactive voltage sensitivity parameter, the current voltage amplitude, the voltage upper limit value, and the voltage lower limit value to obtain the initial value of the reactive power output gap of the adjustable units.

[0132] The fifth calculation sub-module is used to perform iterative calculation according to the initial voltage violation value and the initial value of the reactive power output gap to obtain the adjusted reactive power output gap value.

[0133] The sixth calculation sub-module is used to calculate according to the adjusted reactive power output gap value, the base state output, the output upper limit, and the output lower limit of the reactive power parameters in the adjustable units to obtain the sharing adjustment ratio and the adjusted reactive power output of the adjustable reactive power compensation equipment.

[0134] It should be noted that the modules in the device of the second embodiment correspond to the steps in the method of the first embodiment. The content of the method for automatically generating the power flow scenario of the stability control strategy verification task has been elaborated in detail in the first embodiment, and the content of the modules in the device will not be elaborated in detail in this second embodiment.

[0135] Embodiment 3:

[0136] The embodiment of the present application provides a storage device, which stores multiple pieces of program codes. It is characterized in that the program codes are suitable for being loaded and run by a processor to execute the method for automatically generating the power flow scenario of the above stability control strategy verification task.

[0137] Embodiment 4:

[0138] The embodiment of the present application provides a terminal device, including a processor and a memory;

[0139] The memory is used to store program codes and transmit the program codes to the processor;

[0140] The processor is used to execute the method for automatically generating the power flow scenario of the above stability control strategy verification task according to the instructions in the program codes.

[0141] It should be noted that the processor is used to execute the steps in the method embodiment for automatically generating the power flow scenario of a stability control strategy verification task according to the instructions in the program codes. Alternatively, when the processor executes a computer program, it realizes the functions of each module / unit in the above system / device embodiments.

[0142] Exemplarily, the computer program can be divided into one or more modules / units. One or more modules / units are stored in the memory and executed by the processor to complete the present application. One or more modules / units can be a series of computer program instruction segments capable of completing specific functions, and the instruction segments are used to describe the execution process of the computer program in the terminal device.

[0143] The terminal device can be a computing device such as a desktop computer, a notebook, a palm computer, and a cloud server. The terminal device may include, but is not limited to, a processor and a memory. Those skilled in the art can understand that it does not constitute a limitation on the terminal device, and it may include more or fewer components than shown in the figure, or combine some components, or different components. For example, the terminal device may further include input / output devices, network access devices, a bus, etc.

[0144] The so-called processor may be a Central Processing Unit (CPU), or may also be other general-purpose processors, Digital Signal Processors (DSPs), Application Specific Integrated Circuits (ASICs), Field-Programmable Gate Arrays (FPGAs), or other programmable logic devices, discrete gate or transistor logic devices, discrete hardware components, etc. The general-purpose processor may be a microprocessor or any conventional processor, etc.

[0145] The memory may be an internal storage unit of the terminal device, such as the hard disk or memory of the terminal device. The memory may also be an external storage device of the terminal device, such as a plug-in hard disk, a SmartMedia Card (SMC), a Secure Digital (SD) card, a Flash Card, etc. equipped on the terminal device. Further, the memory may also include both the internal storage unit and the external storage device of the terminal device. The memory is used to store computer programs and other programs and data required by the terminal device. The memory may also be used to temporarily store the data that has been output or will be output.

[0146] Those skilled in the art can clearly understand that for the convenience and brevity of description, the specific working processes of the above-described systems, devices, and units can refer to the corresponding processes in the foregoing method embodiments and will not be described herein again.

[0147] In several embodiments provided in the present application, it should be understood that the disclosed systems, devices, and methods can be implemented in other ways. For example, the device embodiments described above are merely illustrative. For example, the division of the units is only a logical function division, and there may be other division methods in actual implementation. For example, multiple units or components can be combined or integrated into another system, or some features can be ignored or not executed. Another point is that the displayed or discussed couplings or direct couplings or communication connections to each other can be through some interfaces, and the indirect couplings or communication connections of the devices or units can be in electrical, mechanical, or other forms.

[0148] The units described as separate components may or may not be physically separated, and the components displayed as units may or may not be physical units, that is, they may be located in one place, or may be distributed to multiple network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of this embodiment.

[0149] In addition, in each embodiment of the present application, each functional unit may be integrated into a processing unit, may exist separately as individual physical units, or two or more units may be integrated into one unit. The above-mentioned integrated units may be implemented in the form of hardware or in the form of software functional units.

[0150] If the above-mentioned integrated unit is implemented in the form of a software functional unit and sold or used as an independent product, it can be stored in a computer-readable storage medium. Based on this understanding, the technical solution of the present application, in essence, or 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. This computer software product is stored in a storage medium and includes several instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to execute all or part of the steps of the methods described in each embodiment of the present application. The foregoing storage medium includes: various media such as USB flash drives, mobile hard disks, read-only memories (ROM, Read-Only Memory), random access memories (RAM, Random Access Memory), magnetic disks, or optical discs that can store program codes.

[0151] As mentioned above, the above embodiments are only used to illustrate the technical solutions of the present application and are not intended to limit them; although the present application has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions recorded in the foregoing embodiments, or perform equivalent replacements for some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of each embodiment of the present application.

Claims

1. A method for automatically generating power flow scenarios for a stability control strategy verification task, characterized in that, It includes the following steps: S1. Obtain the adjustable devices and power parameters of the power system. The adjustable devices include key units, adjustable units, and adjustable reactive power compensation devices. The power parameters include the active power parameter of the key unit, the reactive power parameter of the key unit, the active power parameter of the adjustable unit, the reactive power parameter of the adjustable unit, and the reactive power parameter of the adjustable reactive power compensation device; S2. Calculate based on the active power parameter of the key unit and the active power parameter of the adjustable unit to obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable unit; S3. Judge whether the power flow of the power system converges according to the adjusted active power output. If the power flow of the power system does not converge, obtain the key section of the power system, set a PV node at the end node in the active power direction of the key section, and recalculate the power flow of the power system until the power flow converges; if the power flow of the power system converges, obtain the balancing node of the power system and the corresponding balancing power value, and judge whether the balancing node is out of limit according to the balancing power value; S4. If the balancing node is not out of limit, obtain the key nodes of the power system and the corresponding voltage parameters, and judge whether the voltage of the key nodes is out of limit according to the voltage parameters; S5. If the voltage of the key node is out of limit, use the reactive power adjustment rule to perform capacity ratio allocation on the adjustable reactive power compensation device, and output and generate the power flow scenario of the power system.

2. The method for automatically generating a power flow scenario of a stability control strategy verification task according to claim 1, wherein Calculating based on the active power parameter of the key unit and the active power parameter of the adjustable unit to obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable unit includes: Obtain the transmission loss of the power system, the initial balancing power value, and the base state output and active power output of the active power parameters of all key units; Calculate according to the transmission loss, the base state output and active power output of the active power parameters of all key units to obtain the initial value of the active power output gap of the adjustable unit; Perform iterative calculation according to the initial balancing power value and the initial value of the active power output gap to obtain the adjusted active power output gap value; Calculate according to the adjusted active power output gap value, the base state output, output upper limit, and output lower limit of the active power parameters in the adjustable unit to obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable unit.

3. The method for automatically generating a power flow scenario for a stability control strategy verification task according to claim 1, characterized in that Performing capacity ratio allocation on the adjustable reactive power compensation device using the reactive power adjustment rule includes: Obtain the reactive power-voltage sensitivity parameter of the power system, the initial voltage out-of-limit value, and the current voltage amplitude, voltage upper limit value, and voltage lower limit value of the voltage parameter; Calculate according to the reactive power-voltage sensitivity parameter, the current voltage amplitude, the voltage upper limit value, and the voltage lower limit value to obtain the initial value of the reactive power output gap of the adjustable unit; Perform iterative calculation according to the initial voltage out-of-limit value and the initial value of the reactive power output gap to obtain the adjusted reactive power output gap value; Calculate according to the adjusted reactive power output gap value, the base state output, output upper limit, and output lower limit of the reactive power parameters in the adjustable unit to obtain the sharing adjustment ratio and adjusted reactive power output of the adjustable reactive power compensation device.

4. The method for automatically generating power flow scenarios for the steady-state control strategy verification task according to claim 1, wherein It includes: If the balancing node is out of limit, return to step S1 again.

5. The method for automatically generating a power flow scenario for a stability control strategy verification task according to claim 1, wherein It includes: If the voltage of the key node does not exceed the limit, output the power flow scenario of the power system.

6. An automatic power flow scenario generation device for a stability control strategy verification task, characterized in that, It includes a parameter acquisition module, a calculation module, a convergence judgment module, a voltage parameter acquisition module, and a power flow generation module; The parameter acquisition module is used to acquire the adjustable equipment and power parameters of the power system. The adjustable equipment includes key units, adjustable units, and adjustable reactive power compensation equipment. The power parameters include the active power parameter of the key unit, the reactive power parameter of the key unit, the active power parameter of the adjustable unit, the reactive power parameter of the adjustable unit, and the reactive power parameter of the adjustable reactive power compensation equipment; The calculation module is used to calculate based on the active power parameter of the key unit and the active power parameter of the adjustable unit to obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable unit; The convergence judgment module is used to judge whether the power system power flow converges according to the adjusted active power output. If the power system power flow does not converge, obtain the key section of the power system, set a PV node at the end node in the active power direction of the key section, and recalculate the power system power flow until the power system power flow converges; if the power system power flow converges, obtain the balance node of the power system and the corresponding balance power value, and judge whether the balance node exceeds the limit according to the balance power value; The voltage parameter acquisition module is used to obtain the key node of the power system and the corresponding voltage parameter according to the non - exceeding of the balance node, and judge whether the voltage of the key node exceeds the limit according to the voltage parameter; The power flow generation module is used to allocate the capacity ratio of the adjustable reactive power compensation equipment according to the voltage limit of the key node by using the reactive power adjustment rule, and output the power flow scenario of the power system.

7. The power flow scenario automatic generation device for the stability control strategy verification task according to claim 6, characterized in that The calculation module includes a data acquisition sub - module, a first calculation sub - module, a second calculation sub - module, and a third calculation sub - module; The data acquisition sub - module is used to acquire the transmission loss of the power system, the initial balance power value, and the base state output and active power output of the active power parameters of all key units; The first calculation sub - module is used to calculate based on the transmission loss, the base state output and active power output of the active power parameters of all key units to obtain the initial value of the active power output gap of the adjustable unit; The second calculation sub - module is used to perform iterative calculation based on the initial balance power value and the initial value of the active power output gap to obtain the adjusted active power output gap value; The third calculation sub - module is used to calculate based on the adjusted active power output gap value, the base state output, output upper limit, and output lower limit of the active power parameters of the adjustable unit to obtain the capacity sharing adjustment ratio and adjusted active power output of the adjustable unit.

8. The power flow scenario automatic generation device for the stability control strategy verification task according to claim 6, wherein The power flow generation module includes a voltage parameter acquisition sub - module, a fourth calculation sub - module, a fifth calculation sub - module, and a sixth calculation sub - module; The voltage parameter acquisition sub - module is used to acquire the reactive power - voltage sensitivity parameter of the power system, the initial voltage limit value, and the current voltage amplitude, voltage upper limit value, and voltage lower limit value of the voltage parameter; The fourth calculation sub-module is configured to calculate, based on the reactive power-voltage sensitivity parameter, the current voltage amplitude, the voltage upper limit value, and the voltage lower limit value, to obtain an initial value of the reactive power output gap of the adjustable units; The fifth calculation sub-module is configured to perform iterative calculation based on the initial voltage over-limit value and the initial value of the reactive power output gap to obtain an adjusted reactive power output gap value; The sixth calculation sub-module is configured to calculate, based on the adjusted reactive power output gap value, the base-state output, the output upper limit, and the output lower limit of the reactive power parameters in the adjustable units, to obtain the sharing adjustment ratio and the adjusted reactive power output of the adjustable reactive power compensation equipment; 9. A storage device that stores multiple program codes, characterized in that, The program code is suitable for being loaded and run by a processor to execute the method for automatically generating a power flow scenario for the stable control strategy verification task according to any one of claims 1-5; 10. A terminal device, characterized in that, comprising a processor and a memory; The memory is configured to store the program code and transmit the program code to the processor; The processor is configured to execute the method for automatically generating a power flow scenario for the stable control strategy verification task according to any one of claims 1-5 according to the instructions in the program code.

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