Voltage stiffness index-based distributed synchronous condenser configuration method and apparatus, and computer device, readable storage medium and program product

Abstract

The present application relates to the technical field of power supplies, and discloses a voltage stiffness index-based distributed synchronous condenser configuration method and apparatus, and a computer device, a readable storage medium and a program product. The method is applied to a renewable energy plant comprising a plurality of input branches, and comprises: determining target voltage stiffness of each input branch, wherein voltage stiffness is used for representing a level of voltage support; determining, on the basis of the target voltage stiffness, a target capacity and a target number of distributed synchronous condensers provided in each input branch, and obtaining a plant-level capacity and a plant-level number on the basis of the sum of the target capacities of the input branches and the sum of the target numbers of the input branches; and configuring the distributed synchronous condensers of the renewable energy plant on the basis of the plant-level capacity and the plant-level number, so as to configure the distributed synchronous condensers according to a target level of voltage support. The present application solves the problem that existing distributed synchronous condenser configuration techniques and indexes lack phase angle information, resulting in the inability to accurately evaluate actual support effects of distributed synchronous condensers and the inability to obtain the configuration numbers and capacities of distributed synchronous condensers that better match actual requirements.

Description

Method, apparatus, computer equipment, readable storage medium, and software product for configuring distributed synchronous condensers based on voltage stiffness index.

[0001] Cross-reference to related applications

[0002] This application claims priority to Chinese Patent Application No. 202411726513.0, filed on November 28, 2024, entitled “Distributed Synchronous Condenser Configuration Method and Apparatus Based on Voltage Stiffness Index”, the entire contents of which are incorporated herein by reference. Technical Field

[0003] This application relates to the field of power supply technology, specifically to a method, apparatus, computer device, readable storage medium, and program product for configuring distributed synchronous condensers based on voltage stiffness index. Background Technology

[0004] To improve the voltage support capability of the sending-end DC converter station and suppress transient overvoltages in the sending-end DC system under transient fault conditions, the current common practice is to install large-capacity centralized synchronous condensers at the AC bus near the 500kV or 750kV DC converter station at the sending end.

[0005] However, while centralized synchronous condensers can effectively suppress overvoltages in connected power plants or converter stations, they are less effective at suppressing overvoltages in medium-voltage or low-voltage renewable energy power plants located at greater electrical distances. Distributed synchronous condensers can serve as an effective technology for suppressing overvoltages in medium-voltage or low-voltage renewable energy power plants. However, current techniques and indicators for evaluating the voltage support effectiveness of distributed synchronous condensers lack phase angle information for the relevant equipment, leading to a discrepancy between the evaluation results and the actual effects. This makes it difficult to determine the optimal number and capacity of distributed synchronous condensers to better match actual needs. Summary of the Invention

[0006] In view of this, this application provides a method, apparatus, computer equipment, readable storage medium, and program product for configuring distributed synchronous condensers based on voltage stiffness index, in order to solve the problem that existing distributed synchronous condenser configuration technologies and indicators lack phase angle information of relevant equipment, which leads to the inability to accurately evaluate the actual support effect of the synchronous condensers and to obtain a distributed synchronous condenser configuration quantity and capacity that better matches actual needs.

[0007] Firstly, this application provides a distributed synchronous condenser configuration method based on voltage stiffness index. This method is applied to renewable energy power stations with multiple input branches. The method includes:

[0008] Determine the target voltage stiffness for each input branch, where voltage stiffness represents the degree of voltage support.

[0009] Based on the target voltage stiffness, determine the target capacity and target number of distributed synchronous condensers set in each input branch, and obtain the station capacity and station number by summing the target capacity and target number of each input branch.

[0010] The distributed synchronous condensers for new energy power plants are configured based on the power plant capacity and number of power plants, and the distributed synchronous condensers are configured according to the target voltage support level.

[0011] The distributed synchronous condenser configuration method based on voltage stiffness index provided in this embodiment uses the target voltage stiffness of each input branch in the new energy power station as an index to obtain the target capacity and target number of distributed synchronous condensers to be set in each input branch. The power station capacity and number of power stations are obtained by summing the target capacity and target number of each input branch, and the distributed synchronous condensers are configured according to the power station capacity and number of power stations, so that the supporting voltage of the new energy power station can meet the overvoltage situation, thereby achieving a significant overvoltage suppression effect.

[0012] In one alternative implementation, the step of determining the target capacity and target number of distributed synchronous condensers installed in each input branch based on the target voltage stiffness includes:

[0013] Confirm the initial capacity and initial number of distributed synchronous condensers set in each input branch;

[0014] Using the initial capacity and initial quantity as the current capacity and current quantity, calculate the current voltage stiffness of the current capacity and current quantity. Iterate and update the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtain the target capacity and target quantity of each input branch. The difference between the updated voltage stiffness corresponding to the target capacity and target quantity and the target voltage stiffness is less than a preset difference threshold.

[0015] In one optional implementation, the step of iteratively updating the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness includes:

[0016] Calculate the total capacity of all input branches in the new energy power station, and calculate the current voltage stiffness under the current capacity and current quantity;

[0017] The capacity adjustment value is obtained based on the target voltage stiffness, total capacity, current capacity, current quantity, and current voltage stiffness;

[0018] The capacity and quantity are updated and adjusted based on the capacity adjustment value.

[0019] In one alternative implementation, the input branch includes: the input branch to be measured and the remaining input branches; the step of calculating the current voltage stiffness under the current capacity and current quantity includes:

[0020] Given the current capacity and quantity, the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector are calculated using the Thevenin equivalent circuit transformation formula.

[0021] The current voltage stiffness is calculated based on the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector.

[0022] In one alternative implementation, the step of calculating the current voltage stiffness under the current capacity and current quantity includes:

[0023] Based on the electromagnetic transient simulation model of the new energy power station, the transient voltage of the AC bus with multiple DC feeds and the no-load voltage of the AC bus with multiple DC feeds are obtained under the current capacity and number.

[0024] The current voltage stiffness is obtained based on the ratio of the AC bus voltage with multiple DC feeds to the AC bus no-load voltage with multiple DC feeds.

[0025] In one alternative implementation, the method further includes:

[0026] If the current voltage stiffness is lower than the target voltage stiffness, increase the current capacity and / or the current quantity;

[0027] If the current voltage stiffness is higher than the target voltage stiffness, reduce the current capacity and / or the current quantity.

[0028] In one alternative implementation, the step of determining the target voltage stiffness for each input branch includes:

[0029] Determine the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or,

[0030] The target voltage stiffness is determined based on the voltage tolerance of each input branch.

[0031] Secondly, this application provides a distributed synchronous condenser configuration device based on voltage stiffness index, the device comprising:

[0032] The first confirmation module is used to confirm the target voltage stiffness of each input branch, where voltage stiffness is used to represent the degree of voltage support.

[0033] The second confirmation module is used to confirm the target capacity and target number of distributed synchronous condensers set in each input branch according to the target voltage stiffness, and to obtain the station capacity and station number by summing the target capacity and target number of each input branch.

[0034] The configuration module is used to configure the distributed synchronous condensers for new energy power plants based on the power plant capacity and number of power plants, so as to configure the distributed synchronous condensers according to the target voltage support level.

[0035] Thirdly, this application provides a computer device, including: a memory and a processor, which are communicatively connected to each other. The memory stores computer instructions, and the processor executes the computer instructions to perform the distributed synchronous condenser configuration method based on voltage stiffness index described in the first aspect or any corresponding embodiment.

[0036] Fourthly, this application provides a computer-readable storage medium storing computer instructions for causing a computer to execute the distributed synchronous condenser configuration method based on voltage stiffness index as described in the first aspect or any corresponding embodiment.

[0037] Fifthly, this application provides a computer program product, including computer instructions for causing a computer to execute the distributed synchronous condenser configuration method based on voltage stiffness index of the first aspect or any corresponding embodiment described above. Attached Figure Description

[0038] To more clearly illustrate the technical solutions in the specific embodiments of this application or the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of this application. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0039] Figure 1 is a schematic diagram of a centralized synchronous condenser.

[0040] Figure 2 is a flowchart of a distributed synchronous condenser configuration method based on voltage stiffness index according to an embodiment of this application;

[0041] Figure 3 is a schematic diagram of the application of the distributed synchronous condenser configuration method based on voltage stiffness index according to an embodiment of this application;

[0042] Figure 4 is a schematic diagram of another application of the distributed synchronous condenser configuration method based on voltage stiffness index according to an embodiment of this application;

[0043] Figure 5 is another flowchart of a distributed synchronous condenser configuration method based on voltage stiffness index according to an embodiment of this application;

[0044] Figure 6 is a structural block diagram of a distributed synchronous condenser configuration device based on voltage stiffness index according to an embodiment of this application;

[0045] Figure 7 is a schematic diagram of the hardware structure of a computer device according to an embodiment of this application. Detailed Implementation

[0046] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0047] In related technologies, to improve the voltage support capability of the sending-end DC converter station and suppress transient overvoltages in the sending-end DC system under transient fault conditions, the current common practice is to install large-capacity centralized synchronous condensers at the AC bus of the 500kV or 750kV high-voltage collection station feeding into the sending-end DC converter station. Referring to Figure 1, the existing technology only installs one centralized synchronous condenser at the collection station of all stations. However, while centralized synchronous condensers can effectively suppress overvoltages in the connected stations or converter stations, they are difficult to achieve significant effects on suppressing overvoltages in medium-voltage or low-voltage renewable energy power stations with greater electrical distances. Distributed synchronous condensers can serve as an effective technology for suppressing overvoltage problems in medium-voltage or low-voltage renewable energy power stations. However, current technologies and indicators for evaluating the voltage support effect of distributed synchronous condensers lack phase angle information of related equipment, resulting in a certain deviation between the evaluation results and the actual effect, making it difficult to obtain a more suitable number and capacity of distributed synchronous condensers to meet actual needs.

[0048] According to an embodiment of this application, a distributed synchronous condenser configuration method based on voltage stiffness index is provided. It should be noted that the steps shown in the flowchart in the accompanying drawings can be executed in a computer system such as a set of computer-executable instructions. Furthermore, although a logical order is shown in the flowchart, in some cases, the steps shown or described may be executed in a different order than that shown here.

[0049] This embodiment provides a distributed synchronous condenser configuration method based on voltage stiffness index, which can be used in the aforementioned mobile terminals, such as mobile phones and tablets. Figure 2 is a flowchart of the distributed synchronous condenser configuration method based on voltage stiffness index according to an embodiment of this application. As shown in Figure 2, the distributed synchronous condenser configuration method based on voltage stiffness index is applied to a new energy power station including multiple input branches. The process includes the following steps:

[0050] Step S101: Confirm the target voltage stiffness of each input branch, where voltage stiffness is used to represent the degree of voltage support.

[0051] Referring to Figure 3, a distributed synchronous condenser (DCC) is a DCC with a certain capacity configured in medium-voltage or low-voltage renewable energy power plants in different regions to achieve effective reactive power compensation and voltage support for the power plant. A renewable energy power plant includes multiple input branches, which can be power generation branches of a wind farm and / or a photovoltaic power plant. Each input branch can be equipped with one or more DCCs, or none at all. The grid-connected equipment is a grid-connected converter. Multiple input branches indicate multiple DC feeds into the renewable energy power plant.

[0052] Specifically, voltage stiffness is expressed as the ratio of the AC bus voltage at the renewable energy power station's outlet to the no-load voltage. The voltage parameters comprehensively include the amplitude and phase information of the equivalent impedance of the grid-connected equipment and the grid equipment, more accurately characterizing the overvoltage suppression and voltage support strength effects under multi-DC-feed renewable energy power station operating conditions. Multiple input branches are designated as input branch 1, input branch 2, ..., input branch i. The target voltage stiffness for each input branch in the renewable energy power station is calculated as target voltage stiffness 1, target voltage stiffness 2, ..., target voltage stiffness i. Optionally, the target voltage stiffness is a value set by the user based on actual conditions.

[0053] Step S102: Determine the target capacity and target number of distributed synchronous condensers set in each input branch according to the target voltage stiffness, and obtain the station capacity and station number by summing the target capacity and target number of each input branch.

[0054] Specifically, based on the target voltage stiffness, the target capacity and target number of distributed synchronous condensers (SCPs) installed in each input branch are calculated. The target capacity can be the unit capacity of one SCP; therefore, the target number can vary depending on the unit capacity of the distributed SCPs. The product of the target capacity and the target number is the capacity to be configured for that input branch. Alternatively, the capacity of the distributed SCPs installed in each input branch can be determined solely based on the target voltage stiffness, and the target capacity and target number can be set according to the capacity to be configured in each input branch. In this case, the distributed SCPs of the renewable energy power station have the optimal configuration capacity.

[0055] Optionally, the target capacity and target number can be obtained based on a preset calculation model. The calculation model finds the target capacity and target number of each input branch whose actual voltage stiffness meets its respective target voltage stiffness threshold. The target voltage stiffness threshold can be a value within a preset range of target voltage stiffness. The capacity and number of distributed synchronous condensers are correlated with the actual voltage stiffness.

[0056] Step S103: Configure the distributed synchronous condensers for each input branch based on the station capacity and number of stations, so as to configure the distributed synchronous condensers according to the target voltage support level.

[0057] Specifically, one or more distributed synchronous condensers can be installed in each input branch; therefore, one or more distributed synchronous condensers can be installed in a new energy power station. The number and unit capacity of distributed synchronous condensers vary depending on the total capacity of the new energy power station.

[0058] Of course, the configuration method of distributed synchronous condensers can also be applied to centralized synchronous condensers in aggregation stations, where multiple input branches can serve as power stations for various new energy plants.

[0059] The distributed synchronous condenser configuration method based on voltage stiffness index provided in this embodiment uses the target voltage stiffness of each input branch in the new energy power station as an index to obtain the target capacity and target number of distributed synchronous condensers to be set in each input branch. The power station capacity and number of power stations are obtained by summing the target capacity and target number of each input branch, and the distributed synchronous condensers are configured according to the power station capacity and number of power stations, so that the supporting voltage of the new energy power station can meet the overvoltage situation, thereby achieving a significant overvoltage suppression effect.

[0060] In some alternative implementations, step S102 includes:

[0061] Step 1: Confirm the initial capacity and initial number of distributed synchronous condensers set in each input branch;

[0062] Specifically, an initial capacity and initial quantity should be roughly set based on the actual situation in the new energy power station. Of course, each initial capacity and initial quantity can be set to a uniform value.

[0063] Step 2: Using the initial capacity and initial quantity as the current capacity and current quantity, calculate the current voltage stiffness of the current capacity and current quantity. Iterate and update the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtain the target capacity and target quantity of each input branch. The difference between the updated voltage stiffness corresponding to the target capacity and target quantity and the target voltage stiffness is less than a preset difference threshold.

[0064] Specifically, given the initial capacity and number of distributed synchronous condensers, the voltage stiffness of each input branch is calculated. The voltage stiffness of each branch is then adjusted according to a preset adjustment unit value. It's worth noting that adjusting the current capacity and number of one input branch may change the current capacity and number of the remaining input branches. Therefore, in each iteration, the current capacity and number of each input branch are adjusted separately before proceeding to the next iteration. Ultimately, the target capacity and target number for each input branch are obtained, where the difference between the updated voltage stiffness and the target voltage stiffness is less than a preset difference threshold. This represents the voltage stiffness of the i-th input branch after the h-th update. This represents the target voltage stiffness of the i-th input branch, and ε represents the preset difference threshold. The difference between the updated voltage stiffness and the target voltage stiffness can be expressed as an absolute value, where m represents multiple input branches.

[0065] In some optional implementations, the step of "iteratively updating the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness" in step two includes:

[0066] Step (1): Calculate the total capacity of all input branches in the new energy power station;

[0067] Specifically, Q Ci0 Let N represent the initial capacity of a single distributed synchronous condenser in the i-th input branch, where i = 1, 2, 3, ..., M, i.e., the number of input branches of the renewable energy power station is M. i0 Q represents the initial quantity. Ci0 N i0 Let Q represent the initial total capacity of the i-th input branch. CT This represents the total capacity of the distributed synchronous condensers at the renewable energy power station, where h represents the h-th round of regulation.

[0068] Step (2): Obtain the capacity adjustment value based on the target voltage stiffness, total capacity, current capacity, current quantity, and current voltage stiffness;

[0069] Specifically, ΔQCi，(h+1) This represents the capacity adjustment value in round h+1. Q represents the target voltage stiffness of the i-th input branch. Ci，(h) N represents the distributed synchronous condenser capacity of the i-th input branch after the h-th round of adjustment, i.e., the current capacity. Ci，(h) Q represents the number of distributed synchronous condensers in the i-th input branch after the h-th round of adjustment, i.e., the current number. CT,(h) This represents the total number of distributed synchronous condensers at renewable energy power stations after the h-th round of adjustments. This represents the voltage stiffness of the i-th clause after the h-th round of adjustment.

[0070] The capacity adjustment value for the (h+1)th round is obtained based on the total capacity of the distributed synchronous condensers of the new energy power station after the h-th round of adjustment, the capacity of the distributed synchronous condensers of the i-th input branch after the h-th round of adjustment, the voltage stiffness of the i-th branch after the h-th round of adjustment, the initial total capacity of the i-th input branch, and the target voltage stiffness of the i-th input branch.

[0071] In other words, the ratio of the capacity adjustment value in the (h+1)th round to the target difference of voltage stiffness and the ratio of the distributed synchronous condenser capacity of the i-th input branch after the h-th round of adjustment to the total capacity of the distributed synchronous condenser of the new energy power station after the h-th round of adjustment are directly proportional.

[0072] Step (3): Update and adjust the current capacity and quantity based on the capacity adjustment value.

[0073] Specifically, after obtaining the capacity adjustment value for round h+1, the total capacity for round h is adjusted to obtain the total capacity of the i-th input branch for round h+1. Ci,(h+1) N i,(h+1) =Q Ci,h N i,h +ΔQ Ci,h+1

[0074] In some optional implementations, the input branch includes: the input branch to be measured and the remaining input branches. The step of "calculating the current voltage stiffness under the current capacity and current quantity" in step two includes:

[0075] Step (1): Under the current capacity and quantity, calculate the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches and the grid impedance vector respectively using the Thevenin equivalent circuit transformation formula.

[0076] Step (2): Calculate the current voltage stiffness based on the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector.

[0077] Specifically, the equivalent circuit transformation formula of Thevenin is used to derive the following... The Thevenin equivalent circuit transformation formula will not be described in detail here. i represents the i-th input branch, and j represents the remaining input branches; that is, when j≥2, j represents the cumulative value of multiple mutual impedances. Referring to Figure 4, (A) is equivalent to (B). Indicates the voltage stiffness of a multi-input branch. U represents the AC bus voltage of the i-th input branch. i0 This represents the no-load voltage of the AC bus in the i-th input branch. and Let represent the AC bus no-load voltage vector of the i-th input branch and the AC bus no-load voltage vector of the j-th branch, respectively. This represents the equivalent impedance vector of a power grid with multiple input branches. This represents the mutual impedance vector between the i-th input branch and j. This represents the self-impedance vector of j. and Let represent the equivalent impedance vectors of the grid-connected equipment in the i-th input branch and the j-th input branch, respectively. Based on relevant research and practical operating experience, generally...

[0078] In some alternative implementations, the step of "calculating the current voltage stiffness under the current capacity and current quantity" in step a1 includes:

[0079] Step (3): Based on the electromagnetic transient simulation model of the new energy power station, obtain the transient voltage of the AC bus with multiple DC feeds and the no-load voltage of the AC bus with multiple DC feeds under the current capacity and current number.

[0080] Step (4): Based on the ratio of the AC bus voltage with multiple DC feeds to the AC bus no-load voltage with multiple DC feeds, obtain the current voltage stiffness.

[0081] Specifically, through the electromagnetic transient simulation model of the new energy power station, the following results were obtained: and U i0 . That is, the transient voltage of the AC bus of the i-th input branch, U i0Let be the no-load voltage of the AC bus of the i-th input branch. Optionally, the simulation software can be PSCAD (Power Systems Computer Aided Design, electromagnetic transient simulation software) or Simulink (a visualization simulation tool), etc. In the simulation software, a corresponding electromagnetic transient simulation model is built based on the energy-absorbing power station structure. The simulation is then used to simulate the no-load voltage values ​​and overvoltage values ​​under transient operating conditions of each AC bus of each new energy power station, and the results are obtained... The formula is used to calculate the voltage stiffness of the i-th clause. That is...

[0082] In some alternative implementations, the configuration method for distributed synchronous condensers further includes:

[0083] Step 1: If the current voltage stiffness is lower than the target voltage stiffness, increase the current capacity and / or the current quantity;

[0084] Step 2: If the current voltage stiffness is higher than the target voltage stiffness, reduce the current capacity and / or the current quantity.

[0085] Specifically, based on the obtained From the formula, it can be seen that the main sensitive parameters affecting the voltage stiffness of the input branch include self-impedance, mutual impedance, equivalent impedance of the equipment, and equivalent impedance of the grid. The voltage stiffness of the input branch is inversely proportional to the equivalent impedance of the grid, but directly proportional to the equivalent impedance of the grid-connected equipment. In order to evaluate the correlation trend of the voltage stiffness of multiple DC feeds with the above self-impedance and mutual impedance, the partial derivatives of voltage stiffness with respect to the two parameters are first derived.

[0086] It can be seen that since the partial derivative of the voltage stiffness of the input branch with respect to its self-impedance is always less than zero, the voltage stiffness of the input branch and its self-impedance show a negative correlation.

[0087] Based on the partial derivative of the voltage stiffness of the input branch with respect to the mutual impedance, we can derive:

[0088] Therefore, the voltage stiffness of the input branch and the mutual impedance show a negative correlation trend.

[0089] The reactive power capacity Q absorbed by the AC bus of a new energy power station vi By taking the derivatives of the self-impedance and mutual impedance respectively, we can obtain:

[0090] It can be seen that voltage stiffness shows a negative correlation with both self-impedance and mutual impedance. Therefore, voltage stiffness shows a positive correlation with the reactive power capacity generated or absorbed by distributed synchronous condensers.

[0091] Therefore, if the current voltage stiffness is lower than the target voltage stiffness, increase the current capacity and / or the current quantity. If the current voltage stiffness is higher than the target voltage stiffness, decrease the current capacity and / or the current quantity.

[0092] In some optional implementations, the step of "confirming the target voltage stiffness of each input branch" in step S101 includes:

[0093] Step 1: Determine the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or,

[0094] Specifically, the optimal capacity of distributed synchronous condensers is configured based on the target voltage stiffness value set for each input branch, and the maximum overvoltage level of the AC bus is usually taken as 1.3 pu.

[0095] Step 2: Determine the target voltage stiffness based on the voltage tolerance of each input branch.

[0096] Specifically, the target voltage stiffness can also be determined based on the actual voltage tolerance of each input branch.

[0097] Referring to Figure 5, based on the actual engineering plan, determine the number and capacity of grid-connected renewable energy converters included in each medium-voltage or low-voltage (e.g., 110kV, 220kV, or 330kV) renewable energy power station. Based on the basic principles and experience of reactive power compensation configuration in renewable energy power stations, configure the initial number and initial capacity of distributed synchronous condensers at each DC-feed AC bus. The equivalent impedance of each renewable energy grid-connected device, as well as the equivalent electromotive force and equivalent impedance of the input branch, are derived through Thevenin equivalent circuit transformation. Based on the obtained... The formulas are used to calculate the voltage stiffness of each DC-injected AC bus in each new energy power station. Alternatively, the no-load voltage and overvoltage values ​​under transient conditions of each AC bus in each new energy power station can be simulated, and the obtained values ​​can be used as a basis for calculation. The formula is used to calculate the voltage stiffness of each AC bus in each new energy power station. If the condition is found to meet the requirements... Under the given conditions, the current distributed synchronous condenser configuration is determined to be the optimal configuration capacity for each renewable energy power station's distributed synchronous condenser. If these conditions are not met... Under the given conditions, calculate the required increase or decrease in the distributed synchronous condenser capacity of the i-th multi-DC-infeed AC bus during the (h+1)-th adjustment round. Then, calculate the capacity of the distributed synchronous condenser at the i-th multi-DC-infeed AC bus after the (h+1)-th adjustment round, and calculate the adjustment capacity of the distributed synchronous condenser at the multi-DC-infeed AC bus of all new energy power plants. Return to the result obtained... The formula is used to calculate the AC bus voltage stiffness of each DC feeder in each new energy power station until the requirements are met. condition.

[0098] This embodiment also provides a distributed synchronous condenser configuration device based on voltage stiffness index. This device is used to implement the above embodiments and optional implementation methods, and details already described will not be repeated. As used below, the term "module" can be a combination of software and / or hardware that implements a predetermined function. Although the device described in the following embodiments is preferably implemented in software, hardware implementation, or a combination of software and hardware, is also possible and contemplated.

[0099] This embodiment provides a distributed synchronous condenser configuration device based on voltage stiffness index, as shown in Figure 6, including:

[0100] The first confirmation module 501 is used to confirm the target voltage stiffness of each input branch, wherein voltage stiffness is used to represent the degree of voltage support.

[0101] The second confirmation module 502 is used to confirm the target capacity and target number of distributed synchronous condensers set in each input branch according to the target voltage stiffness, and to obtain the station capacity and station number by summing the target capacity and target number of each input branch.

[0102] Configuration module 503 is used to configure distributed synchronous condensers for new energy power plants based on the power plant capacity and number of power plants, so as to configure distributed synchronous condensers according to the target voltage support level.

[0103] In some alternative implementations, the second confirmation module 502 includes:

[0104] The first confirmation unit is used to confirm the initial capacity and initial number of distributed synchronous condensers set in each input branch;

[0105] The update unit takes the initial capacity and initial quantity as the current capacity and current quantity, calculates the current voltage stiffness of the current capacity and current quantity, and iteratively updates the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtains the target capacity and target quantity of each input branch. The difference between the updated voltage stiffness corresponding to the target capacity and target quantity and the target voltage stiffness is less than a preset difference threshold.

[0106] In some optional implementations, the updating unit includes:

[0107] The first calculation subunit is used to calculate the total capacity of all input branches in the new energy power station, and to calculate the current voltage stiffness under the current capacity and current quantity.

[0108] The second calculation subunit is used to obtain the capacity adjustment value based on the target voltage stiffness, total capacity, current capacity, current quantity, and current voltage stiffness.

[0109] In some optional implementations, the input branch includes: the input branch to be measured and the remaining input branches, and the update unit further includes:

[0110] The third calculation subunit is used to calculate the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector under the current capacity and current quantity, respectively, using the Thevenin equivalent circuit transformation formula.

[0111] The fourth calculation subunit is used to calculate the current voltage stiffness based on the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector.

[0112] In some optional implementations, the updating unit includes:

[0113] The simulation sub-unit is used for electromagnetic transient simulation models based on new energy power stations to obtain the transient voltage of AC bus with multiple DC feeds and the no-load voltage of AC bus with multiple DC feeds under the current capacity and number.

[0114] The fifth calculation subunit is used to obtain the current voltage stiffness based on the ratio of the AC bus voltage with multiple DC feeds to the AC bus no-load voltage with multiple DC feeds.

[0115] In some alternative embodiments, the device is further configured to increase the current capacity and / or the current quantity if the current voltage stiffness is lower than the target voltage stiffness, and decrease the current capacity and / or the current quantity if the current voltage stiffness is higher than the target voltage stiffness.

[0116] In some alternative implementations, the first confirmation module 501 includes:

[0117] The second confirmation unit confirms the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or,

[0118] The third verification unit is used to verify the target voltage stiffness based on the voltage tolerance of each input branch.

[0119] Further functional descriptions of the above modules and units are the same as those in the corresponding embodiments described above, and will not be repeated here.

[0120] In this embodiment, the distributed synchronous condenser configuration device based on voltage stiffness index is presented in the form of functional units. Here, a unit refers to an ASIC (Application Specific Integrated Circuit) circuit, a processor and memory that execute one or more software or fixed programs, and / or other devices that can provide the above functions.

[0121] This application embodiment also provides a computer device having a distributed synchronous condenser configuration device based on voltage stiffness index as shown in FIG6 above.

[0122] Please refer to Figure 7, which is a schematic diagram of the hardware structure of a computer device according to an embodiment of this application. As shown in Figure 7, the computer device includes one or more processors 10, a memory 20, and interfaces for connecting the various components, including high-speed interfaces and low-speed interfaces. The various components communicate with each other using different buses and can be installed on a common motherboard or otherwise as needed. The processor can process instructions executed within the computer device, including instructions stored in or on memory to display graphical information of a GUI on an external input / output device (such as a display device coupled to the interface). In some alternative implementations, multiple processors and / or multiple buses can be used with multiple memories and multiple memory modules, if desired. Similarly, multiple computer devices can be connected, each providing some of the necessary operations (e.g., as a server array, a group of blade servers, or a multiprocessor system). Figure 7 uses one processor 10 as an example.

[0123] Processor 10 may be a central processing unit, a network processor, or a combination thereof. Processor 10 may further include a hardware chip. The hardware chip may be an application-specific integrated circuit (ASIC), a programmable logic device (PLD), or a combination thereof. The programmable logic device may be a complex programmable logic device (CAMP), a field-programmable gate array (FPGA), a general-purpose array logic (GDA), or any combination thereof.

[0124] The memory 20 stores instructions executable by at least one processor 10 to cause at least one processor 10 to perform the method shown in the above embodiments.

[0125] The memory 20 may include a program storage area and a data storage area. The program storage area may store the operating system and applications required for at least one function; the data storage area may store data created based on the use of the computer device. Furthermore, the memory 20 may include high-speed random access memory and may also include non-transitory memory, such as at least one disk storage device, flash memory device, or other non-transitory solid-state storage device. In some alternative embodiments, the memory 20 may optionally include memory remotely located relative to the processor 10, and these remote memories may be connected to the computer device via a network. Examples of such networks include, but are not limited to, the Internet, intranets, local area networks, mobile communication networks, and combinations thereof.

[0126] The memory 20 may include volatile memory, such as random access memory; the memory may also include non-volatile memory, such as flash memory, hard disk or solid-state drive; the memory 20 may also include a combination of the above types of memory.

[0127] The computer device also includes an input device 30 and an output device 40. The processor 10, memory 20, input device 30, and output device 40 can be connected via a bus or other means; Figure 7 shows an example of a connection via a bus.

[0128] Input device 30 can receive input numerical or character information, and generate key signal inputs related to user settings and function control of the computer device, such as a touchscreen, keypad, mouse, trackpad, touchpad, joystick, one or more mouse buttons, trackball, joystick, etc. Output device 40 may include display devices, auxiliary lighting devices (e.g., LEDs), and haptic feedback devices (e.g., vibration motors). The aforementioned display devices include, but are not limited to, liquid crystal displays, light-emitting diodes, displays, and plasma displays. In some alternative embodiments, the display device may be a touchscreen.

[0129] This application also provides a computer-readable storage medium. The methods described in this application can be implemented in hardware or firmware, or implemented as recordable on a storage medium, or implemented as computer code downloaded over a network and originally stored on a remote storage medium or a non-transitory machine-readable storage medium and subsequently stored on a local storage medium. Thus, the methods described herein can be processed by software stored on a storage medium using a general-purpose computer, a dedicated processor, or programmable or dedicated hardware. The storage medium can be a magnetic disk, optical disk, read-only memory, random access memory, flash memory, hard disk, or solid-state drive, etc.; optionally, the storage medium may also include combinations of the above types of memory. It is understood that computers, processors, microprocessor controllers, or programmable hardware include storage components capable of storing or receiving software or computer code, which, when accessed and executed by the computer, processor, or hardware, implements the methods shown in the above embodiments.

[0130] A portion of this application can be applied as a computer program product, such as computer program instructions, which, when executed by a computer, can invoke or provide the methods and / or technical solutions according to this application through the operation of the computer. Those skilled in the art will understand that the forms in which computer program instructions exist in a computer-readable medium include, but are not limited to, source files, executable files, installation package files, etc. Correspondingly, the ways in which computer program instructions are executed by a computer include, but are not limited to: the computer directly executing the instructions, or the computer compiling the instructions and then executing the corresponding compiled program, or the computer reading and executing the instructions, or the computer reading and installing the instructions and then executing the corresponding installed program. Here, the computer-readable medium can be any available computer-readable storage medium or communication medium accessible to a computer.

[0131] Although embodiments of this application have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of this application, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A method for configuring distributed synchronous condensers based on voltage stiffness index, characterized in that, The distributed synchronous condenser configuration method based on voltage stiffness index is applied to a new energy power station including multiple input branches. The method includes: Determine the target voltage stiffness for each input branch, wherein the voltage stiffness is used to represent the degree of voltage support; Based on the target voltage stiffness, the target capacity and target number of distributed synchronous condensers set in each input branch are determined, and the station capacity and station number are obtained by summing the target capacity and target number of each input branch. Based on the power station capacity and the number of power stations, the distributed synchronous condensers of the new energy power stations are configured to be configured according to the target voltage support level. The step of determining the target capacity and target number of distributed synchronous condensers set in each input branch based on the target voltage stiffness includes: Confirm the initial capacity and initial number of distributed synchronous condensers set in each input branch; Using the initial capacity and initial quantity as the current capacity and current quantity, calculate the current voltage stiffness under the current capacity and current quantity. Iteratively update the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtain the target capacity and target quantity of each input branch. The difference between the updated voltage stiffness corresponding to the target capacity and target quantity and the target voltage stiffness is less than a preset difference threshold.

2. The method according to claim 1, characterized in that, The step of iteratively updating the current capacity and the current quantity based on the current voltage stiffness and the target voltage stiffness includes: Calculate the total capacity of all input branches in the aforementioned new energy power station; The capacity adjustment value is obtained based on the target voltage stiffness, the total capacity, the current capacity, the current quantity, and the current voltage stiffness; The capacity adjustment value is used to update and adjust the current capacity and the current quantity.

3. The method according to claim 1, characterized in that, The input branch includes: the input branch to be measured and the remaining input branches. The step of calculating the current voltage stiffness under the current capacity and current quantity includes: Under the current capacity and the current quantity, the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector are calculated respectively using the Thevenin equivalent circuit transformation formula. The current voltage stiffness is calculated based on the self-impedance vector of the remaining input branches, the grid-connected equipment impedance vector of the input branch to be measured, the grid-connected equipment impedance vector of the remaining input branches, and the grid impedance vector.

4. The method according to claim 1, characterized in that, The step of calculating the current voltage stiffness under the current capacity and the current quantity includes: Based on the electromagnetic transient simulation model of the new energy power station, the transient voltage of the AC bus with multiple DC feeds and the no-load voltage of the AC bus with multiple DC feeds are obtained under the current capacity and the current number. The current voltage stiffness is obtained based on the ratio of the AC bus voltage fed by multiple DC feeds to the AC bus no-load voltage fed by multiple DC feeds.

5. The method according to claim 1, characterized in that, The method further includes: If the current voltage stiffness is lower than the target voltage stiffness, increase the current capacity and / or the current quantity; If the current voltage stiffness is higher than the target voltage stiffness, reduce the current capacity and / or the current quantity.

6. The method according to claim 1, characterized in that, The step of confirming the target voltage stiffness of each input branch includes: Determine the target voltage stiffness based on the actual voltage support requirements of each input branch; and / or, The target voltage stiffness is determined based on the voltage tolerance of each input branch.

7. A distributed synchronous condenser configuration device based on voltage stiffness index, characterized in that, The distributed synchronous condenser configuration device based on voltage stiffness index includes: The first confirmation module is used to confirm the target voltage stiffness of each input branch, wherein the voltage stiffness is used to represent the degree of voltage support; The second confirmation module is used to confirm the target capacity and target number of distributed synchronous condensers installed in each input branch according to the target voltage stiffness, and to obtain the station capacity and station number by summing the target capacity and target number of each input branch; wherein, confirming the target capacity and target number of distributed synchronous condensers installed in each input branch according to the target voltage stiffness includes: Confirm the initial capacity and initial number of distributed synchronous condensers set in each input branch; Using the initial capacity and initial quantity as the current capacity and current quantity, calculate the current voltage stiffness under the current capacity and current quantity. Iteratively update the current capacity and current quantity based on the current voltage stiffness and the target voltage stiffness until the current voltage stiffness of each input branch meets its respective target voltage stiffness, and obtain the target capacity and target quantity of each input branch. The difference between the updated voltage stiffness corresponding to the target capacity and target quantity and the target voltage stiffness is less than a preset difference threshold. The configuration module is used to configure the distributed synchronous condensers of the new energy power stations based on the station capacity and the number of stations, so as to configure the distributed synchronous condensers according to the target voltage support level.

8. A computer device, characterized in that, include: The system includes a memory and a processor, which are interconnected. The memory stores computer instructions, and the processor executes the computer instructions to perform the distributed synchronous condenser configuration method based on voltage stiffness index as described in any one of claims 1 to 6.

9. A computer-readable storage medium, characterized in that, The computer-readable storage medium stores computer instructions for causing the computer to execute the distributed synchronous condenser configuration method based on voltage stiffness index as described in any one of claims 1 to 6.

10. A computer program product, characterized in that, Includes computer instructions for causing a computer to execute the distributed synchronous condenser configuration method based on voltage stiffness index as described in any one of claims 1 to 6.

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