A method and system for comprehensively evaluating transient voltage support effect of a network-constructed power supply

Abstract

The application provides a network-constructed power supply transient voltage support effect comprehensive evaluation method and system, and belongs to the technical field of voltage stability evaluation, and comprises the following steps: establishing an electromagnetic transient simulation model of a new energy cluster; setting node voltage, line impedance and unit control strategy parameters of the electromagnetic transient simulation model to ensure that the electromagnetic transient simulation model is consistent with an actual system; applying a typical disturbance after the electromagnetic transient simulation model runs to reach a steady state; recording transient voltage response curves of grid-connected nodes of each new energy station under each working condition and disturbance scene, and extracting a maximum voltage drop amplitude or a maximum overvoltage amplitude; calculating voltage severity factors of each node, and then calculating a transient voltage support effect comprehensive evaluation index of the whole system.

Description

Technical Field

[0001] This invention belongs to the field of voltage stability evaluation technology, and in particular relates to a comprehensive evaluation method and system for the transient voltage support effect of grid-type power supply. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] New energy sources such as wind power and photovoltaic power, which are based on power electronic interfaces, are gradually replacing traditional synchronous generators and becoming the main power source of the power system. However, compared with synchronous generators, these units lack natural voltage support and inertia characteristics, making the voltage stability of the power grid more vulnerable to disturbances such as short circuits, line disconnections, and sudden load changes.

[0004] Existing voltage stability evaluation methods mainly rely on single-node voltage drop percentage, voltage margin, or Q - V While indicators such as curves are used, these methods often fail to reflect the nonlinear effects of voltage disturbances, lack characterization of the overall support level of multi-node new energy clusters, and are difficult to quantitatively compare the improvement effects before and after grid-connected power sources, resulting in insufficient engineering applicability.

[0005] Grid-formed power sources (GFM) have the ability to actively regulate voltage and frequency, which can significantly improve the voltage support performance of the power system. However, how to scientifically and quantitatively evaluate the improvement effect brought about by their access remains a key challenge in grid operation and the optimal allocation of new energy sources.

[0006] Traditional single-node evaluation methods struggle to accurately characterize the nonlinear characteristics of voltage disturbances and the overall support capability of multi-node clusters, failing to provide a unified quantification of the improvement in transient voltage support before and after grid-connected power sources. Given that grid-connected power sources can significantly improve voltage stability, the lack of scientific and quantitative evaluation standards has become a core bottleneck restricting their engineering application and optimized configuration. Establishing standardized and quantitative evaluation methods and systems for the transient voltage support effect of grid-connected power sources is of great significance for improving the operational stability of new energy clusters. Summary of the Invention

[0007] To overcome the shortcomings of the prior art, this invention provides a comprehensive evaluation method and system for the transient voltage support effect of grid-connected power sources. This method can comprehensively reflect the nonlinear impact of node voltage drops and overvoltages on system stability, construct a unified cluster-level index, achieve quantitative comparison of voltage support capabilities under different operating conditions, and establish a standardized simulation and testing process to support engineering applications and optimized configurations. This provides technical support for the proportional configuration and spatial layout of grid-connected power sources in new energy clusters.

[0008] To achieve the above objectives, one or more embodiments of the present invention provide the following technical solutions: Firstly, a comprehensive evaluation method for the transient voltage support effect of grid-type power supplies is disclosed, including: Establish an electromagnetic transient simulation model for the new energy cluster; Parameters for node voltages, line impedances, and unit control strategies are set for the electromagnetic transient simulation model to ensure that the electromagnetic transient simulation model is consistent with the actual system. After the electromagnetic transient simulation model reaches steady state, a typical disturbance is applied. Under each operating condition and disturbance scenario, the transient voltage response curves of each new energy power station grid-connected node are recorded, and the maximum voltage drop amplitude or the maximum overvoltage amplitude is extracted. Calculate the voltage severity factor of each node, and then calculate the comprehensive evaluation index of the transient voltage support effect of the entire system.

[0009] As a further technical solution, the electromagnetic transient simulation model includes grid-connected units, grid-connected units, step-up transformers, transmission lines, and the equivalent circuit topology of the main grid.

[0010] As a further technical solution, it also includes setting operating conditions: Operating Condition A: All new energy generating units are operating in grid-connected GFL mode, with grid-connected units accounting for 0%; Condition B: Configure a certain proportion of grid-type GFM units according to the optimization scheme, and the other conditions are the same as those in Condition A.

[0011] As a further technical solution, a comprehensive evaluation index of the transient voltage support effect under different operating conditions is compared to obtain the index difference value. When the difference value is greater than 0, it indicates that the grid-connected units have improved the transient voltage support capability of the new energy cluster; when the difference value is less than or equal to 0, it indicates that the grid-connected units have not had a positive effect on the transient voltage support effect.

[0012] As a further technical solution, it also includes: setting a grading standard based on the changes in the comprehensive evaluation index of the transient voltage support effect of the entire system.

[0013] As a further technical solution, it also includes: calculating the individual improvement rate of each node to determine the effect of improving local transient voltage support.

[0014] Secondly, a comprehensive evaluation system for the transient voltage support effect of a grid-type power supply is disclosed, including: The modeling module is configured to: establish an electromagnetic transient simulation model for the new energy cluster; Parameters for node voltages, line impedances, and unit control strategies are set for the electromagnetic transient simulation model to ensure that the electromagnetic transient simulation model is consistent with the actual system. The disturbance injection module is configured to apply typical disturbances after the electromagnetic transient simulation model reaches a steady state. The data acquisition module is configured to record the transient voltage response curves of each grid-connected node of each new energy power station under each operating condition and disturbance scenario, and extract the maximum voltage drop amplitude or the maximum overvoltage amplitude. The index calculation module is configured to calculate the voltage severity factor of each node, and then calculate the comprehensive evaluation index of the transient voltage support effect of the entire system.

[0015] As a further technical solution, a result determination module is also included, which is configured to: compare the comprehensive evaluation index of transient voltage support effect under different operating conditions, obtain the index difference value, and when the difference value is greater than 0, it indicates that the grid-connected unit has improved the transient voltage support capability of the new energy cluster; when the difference value is less than or equal to 0, it indicates that the grid-connected unit has not had a positive effect on the transient voltage support effect.

[0016] The above one or more technical solutions have the following beneficial effects: This invention addresses the issue that a severe voltage drop at a single node can weaken the transient voltage support capability of a power cluster, potentially exceeding the cumulative effect of minor voltage drops across multiple nodes. The proposed indicators accurately reflect this difference, providing a valid basis for identifying vulnerable nodes and developing targeted compensation strategies. Furthermore, this invention achieves standardized and quantitative evaluation of the grid-connected unit access performance, demonstrating repeatability and comparability, and providing a scientific basis for configuration optimization and operational monitoring in engineering practice.

[0017] Advantages of additional aspects of the invention will be set forth in part in the description which follows, and in part will be obvious from the description, or may be learned by practice of the invention. Attached Figure Description

[0018] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0019] Figure 1This is a schematic diagram of the testing process of the method in an embodiment of the present invention; Figure 2 The node voltage drop amplitude Δ in an embodiment of the present invention U With low voltage severity factor Relationship diagram; Figure 3 The node voltage rise amplitude Δ in an embodiment of the present invention U With overvoltage severity factor A diagram illustrating the relationship between the two. Detailed Implementation

[0020] It should be noted that the following detailed descriptions are exemplary and intended to provide further illustration of the invention. Unless otherwise specified, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0021] It should be noted that the terminology used herein is for the purpose of describing particular implementations only and is not intended to limit the exemplary implementations of the present invention.

[0022] Where there is no conflict, the embodiments and features in the embodiments of the present invention can be combined with each other.

[0023] Example 1 This embodiment discloses a comprehensive evaluation method for the transient voltage support effect of a grid-type power supply, including: Step 1: Establish an electromagnetic transient simulation model for the new energy cluster; Parameters for node voltages, line impedances, and unit control strategies are set for the electromagnetic transient simulation model to ensure that the electromagnetic transient simulation model is consistent with the actual system. Step 2: Operating Condition Settings; Operating Condition A: All new energy generating units are operating in grid-connected GFL mode, with grid-connected units accounting for 0%. Condition B: Configure a certain proportion of grid-type GFM units according to the optimization plan, and the other conditions are the same as those in Condition A; Step 3: After the electromagnetic transient simulation model reaches steady state, apply typical disturbances; Step 4: Under each operating condition and disturbance scenario, record the transient voltage response curve of each new energy power station grid connection node, and extract the maximum voltage drop amplitude or the maximum overvoltage amplitude. Step 5: Calculate the voltage severity factor of each node, and then calculate the comprehensive evaluation index of the transient voltage support effect of the entire system.

[0024] Step Six: Result Comparison and Analysis.

[0025] In this implementation example, the evaluation scheme system for transient voltage support effect of renewable energy cluster grid-type power sources based on voltage severity factor can comprehensively reflect the nonlinear impact of node voltage dips and overvoltages on system stability and construct a unified cluster-level index. V index This enables quantitative comparison of voltage support capabilities under different operating conditions, and establishes standardized simulation and testing processes to support engineering applications and optimized configurations, thereby providing technical support for the proportional configuration and spatial layout of grid-type power sources in new energy clusters.

[0026] The testing procedure proposed in this invention aims to quantitatively evaluate the changes in the support capability of new energy clusters under transient voltage disturbance conditions before and after grid-connected units are connected. At the same time, it identifies weak nodes in the system and clarifies the degree of support improvement of grid-connected units at different nodes, thereby verifying the effectiveness of the optimization scheme and providing a reference for further optimization of the capacity configuration and spatial distribution of grid-connected units.

[0027] The basic idea of ​​the testing method includes: constructing a refined model of the new energy cluster in an electromagnetic transient simulation platform (such as PSCAD, DIgSILENT / PowerFactory) to simulate the operating conditions before and after configuring grid-connected units; recording the dynamic voltage response of each node under set disturbance conditions; extracting the transient voltage drop or rise amplitude, and calculating a comprehensive index in combination with the severity factor. V index Finally, the changes in indicators under different operating conditions were compared to evaluate the improvement effect of transient voltage support of grid-connected units.

[0028] In one implementation example, the entire testing process can be divided into the following six steps: In step one, system modeling and parameter setting: establish an electromagnetic transient simulation model of the new energy cluster, which includes grid-connected units (GFL), grid-connected units (GFM), step-up transformers, transmission lines, and the equivalent circuit topology of the main grid.

[0029] More specifically, an electromagnetic transient simulation model of the new energy cluster was constructed based on the DIgSILENT PowerFactory simulation software. Following the actual power grid wiring diagram, busbar, transmission line models, and the equivalent voltage source of the main grid were drawn on the simulation canvas. New energy station models were integrated into each power station node. The GFM and GFL network types are physically identical, but their control system structures differ.

[0030] Configure node voltages, line impedances, and unit control strategy parameters to ensure that the simulation model is consistent with the actual system.

[0031] The specific parameters of the unit control strategy include: the phase-locked loop (PLL) parameters and current loop parameters of the grid-connected GFL unit; and the virtual synchronization VSG parameters of the grid-connected GFM unit, including the virtual inertia J and virtual damping coefficient D, the power-voltage QV droop coefficient, voltage loop parameters, and current loop parameters.

[0032] Step two includes setting the operating conditions: Operating Condition A: All new energy generating units are operating in grid-connected GFL mode, with grid-connected units accounting for 0%.

[0033] Condition B: Configure a certain proportion of grid-connected GFM units according to the optimization scheme. The other conditions are the same as those in Condition A. The other conditions are: grid topology, line and transformer parameters, and control strategy parameters of grid-connected GFL units.

[0034] It should be noted that in Condition B, the operating modes of the units are clearly distinguished according to the configuration. Grid-connected GFM units operate in grid-connected mode, and grid-following GFL units operate in grid-following mode. In Condition A, the new energy cluster only includes grid-following GFL units, and all of them operate in grid-following mode. Condition B is based on Condition A and configures a certain proportion of grid-connected GFM units. These newly configured grid-connected GFM units all operate in grid-connected mode.

[0035] In step three, the perturbation is designed.

[0036] After the system reaches steady state, typical disturbances are applied, such as three-phase short-circuit faults (duration 0.1~0.2s), single-circuit line disconnection, and sudden addition or removal of large loads. The disturbance location can be set at the main grid, local nodes, or key transmission channels to cover different types of transient voltage dynamic characteristics.

[0037] In step four, data acquisition and processing take place.

[0038] Under each operating condition and disturbance scenario, the transient voltage response curves of each renewable energy power plant's grid-connected node were recorded. U i ( t ), and extract the maximum voltage drop amplitude or the maximum overvoltage amplitude.

[0039] Calculate the voltage offset using the extracted voltage extreme values: If a voltage drop occurs, then calculate the voltage offset based on the steady-state voltage U before the disturbance. pre, i With the lowest voltage U during the disturbance min, i The difference is used to calculate the transient voltage drop amplitude ΔU. i -; If a voltage rise occurs, then based on the maximum voltage U during the disturbance period. max, i with U pre, i Calculate the overvoltage ΔU by the difference iNext, substitute the obtained ΔU into the corresponding severity factor function: Low voltage severity factor S v - Using function S v - = e 2.197 ΔU- The overvoltage severity factor S v + Then use function S v + = e 6.57 ΔU+ .

[0040] In step five, the voltage support effect index is calculated.

[0041] Calculate the voltage severity factor for each node. S v,i ,

[0042] Then, calculate the comprehensive evaluation index of the transient voltage support effect of the entire system:

[0043] n corresponds to the number of new energy power station nodes in the new energy cluster.

[0044] In step six, the results are compared and analyzed.

[0045] Comparison of operating conditions A and B V index :

[0046] When Δ V index When Δ > 0, it indicates that the grid-connected generating units have improved the transient voltage support capability of the new energy cluster; when Δ V index If the value is ≤ 0, it indicates that the grid-connected units did not have a positive effect on transient voltage support. Further analysis of the Δ value at each node is needed. U i and S v,i The changes were analyzed to identify the nodes with the greatest improvement and the remaining weak nodes.

[0047] The specific analysis process involves comparing the data differences between the nodes of each power station in the new energy cluster under operating conditions A and B. The specific steps are as follows: For each node i in the new energy cluster, extract its transient voltage ΔU under operating condition A. A,i And the corresponding ΔU under operating condition B. B,i .

[0048] Calculate the severity factor S for each node under condition A. vA,i S under operating condition B vB,i Transient voltage change (ΔU) A,i -ΔU B,i ) and the decrease in severity factor (S vA,i - S vB,i ).

[0049] The extent of improvement is mainly determined by the reduction in the severity factor (S) in operating condition B. vA,i - S vB,i (Severity factor S relative to operating condition A) vA,i The degree of decline is considered, with the node showing the greatest decline being the node with the greatest improvement. Weak nodes are identified by scanning all nodes in condition B; if the severity factor S of a given node... vB,i If the level remains high, the node is identified as a weak node.

[0050] Through the above process, this invention achieves a standardized and quantitative evaluation of the grid-connected unit access effect, which is repeatable and comparable, and can provide a scientific basis for configuration optimization and operation monitoring in engineering practice.

[0051] Judgment Criteria: To facilitate rapid assessment of the configuration effectiveness of grid-connected units in engineering projects, the following criteria can be used: V index The change sets the grading criteria, as shown in Table 1. V index The change ratio is the index of condition B relative to condition A. V index The change in is calculated using the formula ( ). V index,A - V index,B ) / V index,A *100%.

[0052] Table 1 Based on S v Classification and Judgment Standards for Transient Voltage Support Performance of New Energy Clusters grade <![CDATA[V index Change ratio]]> Description of the degree of improvement Significant improvement ≥ 30% The system's transient voltage support capability has been significantly enhanced, and weak nodes have been basically eliminated. Moderate improvement 10% ~ 30% The overall transient voltage support capability of the system has been improved, but some weak points still need to be optimized. Limited improvement <10% The improvement in system transient voltage support is limited, and the configuration scheme needs to be re-evaluated. In addition, the individual improvement rate of each node can be used as supplementary data:

[0053] The individual improvement rate mentioned above is used to assess the effectiveness of local transient voltage support improvement. Its role is to assist in analyzing the degree of improvement in node transient voltage before and after the grid-connected units in each power station node of the new energy cluster, from the perspective of a single power station. The parameter Δ... U A,i and Δ U B,iThis refers to the magnitude of the transient voltage at node i in operating conditions A and B.

[0054] In one implementation example, regarding the low voltage severity factor.

[0055] This embodiment proposes a Low Voltage Support Severity Factor. This is used to characterize the nonlinear impact of voltage sag at grid-connected nodes of renewable energy power plants on system stability under voltage disturbances. When a disturbance occurs, the node voltage amplitude decreases by Δ... U When the voltage drop amplitude is expressed as per unit value (pu), the larger the amplitude, the more severe the impact on system stability, and the stronger the reactive power support and voltage regulation capability required for its recovery process. Therefore, nodes can be defined. i The transient voltage drop amplitude is: (1) in, U pre,i The steady-state voltage before the disturbance. U min,i The voltage is the lowest voltage during the disturbance period, and all voltage values ​​are expressed in per-unit (pu). The above parameters are obtained by voltage measurement devices at the grid connection point of the new energy power station.

[0056] Therefore, this embodiment defines a low voltage severity factor and a voltage drop amplitude Δ. U They satisfy a monotonically increasing exponential relationship: (2) Where, Δ U The value range is 0~1 pu a This is a proportionality coefficient used to determine the initial value; b This is the exponential coefficient, used to control the growth rate of the curve. The principle for selecting the parameter is as follows: a) Initial value constraint: when Δ U →0, A value close to 1 indicates the lowest severity of voltage drop. Therefore, a The proportionality coefficient is set to 1.

[0057] b) Moderate drop response: when Δ U = 0.5 pu, which means when the voltage drops by 50%, The value should be significantly increased to approximately 3 to reflect the severity of a noticeable node voltage dip. The coefficient is then obtained from this solution. bThe approximate value is 2.197.

[0058] c) Extreme drop response: when Δ U When the PU is in the range of 0.8~0.9, The value should be rapidly increased to 6–8 or higher to reflect that the system is in a state of severe voltage instability, a result consistent with engineering experience.

[0059] In summary, the low voltage severity factor The function can be determined as: (3) The function is in Δ U = 0 takes the value of 1; in Δ U = 0.5 pu is approximately 3; in Δ U = 0.9 pu, approximately 7.2. When the voltage drop is too large, it can be directly identified as voltage instability, and its curve is as follows. Figure 2 As shown.

[0060] from Figure 2 It can be seen from this that when Δ U When it is relatively small, such as 0.05 pu, A value close to 1 indicates that the voltage fluctuation at that node is within an acceptable range; when Δ U When the voltage is relatively high, such as 0.5 pu or even close to the low-voltage ride-through limit, A significant increase indicates that the system is in a state of transient low voltage instability risk.

[0061] In one implementation example, regarding the overvoltage severity factor.

[0062] This embodiment further proposes an over-voltage support severity factor (Over-voltage Support Severity Factor). This is used to characterize the system stability risk caused by voltage rise at the grid-connected nodes of renewable energy power plants after a disturbance. When a disturbance occurs, if the transient voltage amplitude at the node rises by Δ relative to the steady-state voltage before the disturbance... U + Then nodes can be defined. i The overvoltage overamplitude is: (4) in, U pre,i The steady-state voltage before the disturbance. U max,iThis represents the maximum voltage during the disturbance, and all voltage values ​​are expressed in per-unit (pu).

[0063] To reflect the nonlinear effect of overvoltage on system stability, this example uses an exponentially monotonically increasing function similar to that used in the low-voltage case: (5) The following principles should be followed when selecting parameters: (1) When Δ U + When = 0, = 1 indicates that there is no offset in the node voltage and the system is in a normal state; (2) When Δ U + When the voltage rises to 0.3 pu (i.e., the voltage increases to 1.3 pu), the node is considered to be in a severe overvoltage state. It should reach 6 to 8 or higher to reflect that the system faces a high stability risk.

[0064] Therefore, the typical functional expression for the overvoltage severity factor can be obtained as follows: (6) Typical values ​​are as follows: , , , This can be understood as follows: a voltage value of 1.1 pu is considered a slight overvoltage, 1.2 pu is a moderate overvoltage, and a voltage ≥ 1.3 pu is a severe overvoltage. The curve is shown below. Figure 3 As shown.

[0065] Compared to the low-voltage scenario, the overvoltage severity factor set in this embodiment is... The curves use different exponential coefficients to reflect the power grid's greater sensitivity to transient overvoltages, meaning that transient overvoltage conditions typically enter the danger zone in a steeper manner. This design aligns with the actual operating characteristics of power electronic systems under transient overvoltage disturbances and can more accurately reflect the system's risk level.

[0066] In one implementation example, the comprehensive index of cluster transient voltage support is discussed.

[0067] In containing n In a cluster of new energy power station nodes, the voltage drop or rise amplitude Δ of each node. U i and its corresponding severity factor S v,i There may be differences. To obtain a comprehensive quantitative indicator that reflects the transient voltage support level of the entire cluster, this invention proposes to use the ΔV of each node...U i With the corresponding S v,i Perform a weighted summation to define a comprehensive index for cluster transient voltage support. V index As shown below: (7) Comprehensive indicators V index It has the following characteristics: (1) Global: It covers all new energy power station nodes and can reflect the overall transient voltage support capability level of the cluster; (2) Sensitivity: Nodes with larger voltage drops are given higher weights, thereby highlighting the weak links in the system; (3) Comparability: It can make quantitative comparisons between different operating conditions (such as before and after grid-connected units). The larger the value, the weaker the overall transient voltage support capability of the cluster.

[0068] The following application examples are given: In operating condition A, the voltage drop amplitude Δ at a certain node is... U = 0.5 pu corresponds to severity factor S v = 3, then the node corresponds to the indicator V index The contribution is 0.5 × 3 = 1.5; In operating condition B, assume that there are 5 nodes with the same voltage drop magnitude, all of which are Δ. U = 0.1 pu corresponds to severity factor S v = 1, then the cluster comprehensive index V index The result is 0.1 × 1 × 5 = 0.5; The calculation results show that although the number of nodes experiencing voltage drops is greater in condition B, the overall performance is significantly lower than in condition A due to the smaller magnitude of the voltage drops. This indicates that the weakening effect of a severe voltage drop at a single node on the transient voltage support capability of the cluster may be greater than the cumulative effect of minor voltage drops at multiple nodes. The index proposed in this invention accurately reflects this difference, providing a valid basis for identifying vulnerable nodes in the system and developing targeted compensation strategies.

[0069] The engineering implementation of this evaluation method mainly relies on a power system simulation analysis platform, and the supporting effect is verified through comparative analysis.

[0070] 1. In electromagnetic transient simulation platforms, such as PSCAD or DIgSILENT, establish a refined model of the new energy cluster based on the actual engineering topology, including grid-connected GFL and grid-connected GFM units, booster stations, and equivalent circuits of the main grid.

[0071] 2. Operating Condition A: Set all units in the cluster to operate in grid-connected mode; Operating Condition B: Configure grid-connected units according to the engineering optimization design scheme, keeping other physical parameters unchanged.

[0072] 3. Apply typical disturbances such as three-phase short circuits, line disconnection, or large load switching to key busbars or transmission channels in the simulation system to simulate the power grid operating environment.

[0073] 4. This method can be evaluated using the collected grid voltage data.

[0074] Data processing steps: 1. Record the voltage transient response curve Ui(t) of each node at the grid connection point after the disturbance occurs.

[0075] 2. Extract the lowest point U of the maximum voltage drop from the waveform. min,i Or the highest point of overvoltage U max,i .

[0076] 3. Voltage deviation calculation, drop amplitude: ΔU i - = U pre,i - U min,i Overvoltage amplitude: ΔU i + = U pre,i +U max,i .

[0077] 4. Substitute the above amplitude values ​​into the corresponding exponential function to calculate the severity factor S for each node. v,i .

[0078] 5. Calculate the comprehensive index V index Δ V index .

[0079] Example 2 The purpose of this embodiment is to provide a computer device, including a memory, a processor, and a computer program stored in the memory and executable on the processor, wherein the processor executes the program to implement the steps of the above-described method.

[0080] Example 3 The purpose of this embodiment is to provide a computer-readable storage medium.

[0081] A computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, performs the steps of the above method.

[0082] Example 4 The purpose of this embodiment is to provide a comprehensive evaluation system for the transient voltage support effect of grid-type power supplies, including: Modeling module: Used to establish electromagnetic transient models of new energy clusters; Disturbance injection module: used to apply preset faults or disturbances; Data acquisition module: used to record the dynamic process of node voltage; Indicator Calculation Module: Used to calculate voltage severity factor and comprehensive index. V index ; Result determination module: based on Δ V index Conclusions on improving the set standard output.

[0083] Example 5 The purpose of this embodiment is to provide a computer program product containing instructions that, when run on a computer, cause the computer to perform the methods and functions involved in any of the above embodiments.

[0084] The steps and methods involved in the apparatus of the above embodiments correspond to those in Embodiment 1. For specific implementation details, please refer to the relevant description section of Embodiment 1. The term "computer-readable storage medium" should be understood as a single medium or multiple media including one or more instruction sets; it should also be understood as including any medium capable of storing, encoding, or carrying an instruction set for execution by a processor and enabling the processor to perform any of the methods in this invention.

[0085] Those skilled in the art will understand that the modules or steps of the present invention described above can be implemented using general-purpose computer devices. Optionally, they can be implemented using computer-executable program code, thereby allowing them to be stored in a storage device for execution by a computer device, or they can be fabricated as separate integrated circuit modules, or multiple modules or steps can be fabricated as a single integrated circuit module. The present invention is not limited to any particular combination of hardware and software.

[0086] While the specific embodiments of the present invention have been described above in conjunction with the accompanying drawings, this is not intended to limit the scope of protection of the present invention. Those skilled in the art should understand that various modifications or variations that can be made by those skilled in the art without creative effort based on the technical solutions of the present invention are still within the scope of protection of the present invention.

Claims

1. A method for comprehensively evaluating the effects of network-forming power supply transient voltage support, characterized in that, include: Establish an electromagnetic transient simulation model for the new energy cluster; Parameters for node voltages, line impedances, and unit control strategies are set for the electromagnetic transient simulation model to ensure that the electromagnetic transient simulation model is consistent with the actual system. After the electromagnetic transient simulation model reaches steady state, a typical disturbance is applied. Under each operating condition and disturbance scenario, the transient voltage response curves of each new energy power station grid-connected node are recorded, and the maximum voltage drop amplitude or the maximum overvoltage amplitude is extracted. Calculate the voltage severity factor of each node, and then calculate the comprehensive evaluation index of the transient voltage support effect of the entire system.

2. The comprehensive evaluation method for transient voltage support effect of grid-type power supply as described in claim 1, characterized in that, The electromagnetic transient simulation model includes grid-connected units, grid-connected units, step-up transformers, transmission lines, and the equivalent circuit topology of the main grid.

3. The comprehensive evaluation method for transient voltage support effect of grid-type power supply as described in claim 1, characterized in that, It also includes setting operating conditions: Operating Condition A: All new energy generating units are operating in grid-connected GFL mode, with grid-connected units accounting for 0%; Condition B: Configure a certain proportion of grid-type GFM units according to the optimization scheme, and the other conditions are the same as those in Condition A.

4. The comprehensive evaluation method for transient voltage support effect of grid-type power supply as described in claim 1, characterized in that, By comparing the comprehensive evaluation index of transient voltage support effect under different operating conditions, the index difference value is obtained. When the difference value is greater than 0, it indicates that the grid-type unit has improved the transient voltage support capability of the new energy cluster. When the difference is less than or equal to 0, it indicates that the connection of the grid-connected units has not had a positive effect on the transient voltage support effect.

5. The comprehensive evaluation method for transient voltage support effect of grid-type power supply as described in claim 1, characterized in that, it also... include: The grading standards are set based on the changes in the comprehensive evaluation index of the transient voltage support effect of the entire system. Calculate the individual improvement rate of each node to determine the effectiveness of the local transient voltage support improvement.

6. A comprehensive evaluation system for the transient voltage support effect of a grid-type power supply, characterized in that, include: The modeling module is configured to: establish an electromagnetic transient simulation model for the new energy cluster; Parameters for node voltages, line impedances, and unit control strategies are set for the electromagnetic transient simulation model to ensure that the electromagnetic transient simulation model is consistent with the actual system. The disturbance injection module is configured to apply typical disturbances after the electromagnetic transient simulation model reaches a steady state. The data acquisition module is configured to record the transient voltage response curves of each grid-connected node of each new energy power station under each operating condition and disturbance scenario, and extract the maximum voltage drop amplitude or the maximum overvoltage amplitude. The index calculation module is configured to calculate the voltage severity factor of each node, and then calculate the comprehensive evaluation index of the transient voltage support effect of the entire system.

7. The comprehensive evaluation system for transient voltage support effect of a grid-type power supply as described in claim 6, characterized in that, It also includes a result determination module, which is configured to: compare the comprehensive evaluation index of transient voltage support effect under different operating conditions, obtain the index difference value, and when the difference value is greater than 0, it indicates that the grid-type unit has improved the transient voltage support capability of the new energy cluster. When the difference is less than or equal to 0, it indicates that the connection of the grid-connected units has not had a positive effect on the transient voltage support effect.

8. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the method of any one of claims 1 to 5.

9. A computer device comprising a memory, a processor, and a computer program stored in the memory and executable on the processor, characterized in that, When the processor executes the program, it implements the steps of the method described in any one of claims 1-5.

10. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the program is executed by the processor, it performs the steps of the method described in any one of claims 1-5.

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