Direct current power control method and device, computer device and storage medium

Abstract

The application relates to a conventional direct-current power control method and device, computer equipment, a storage medium and a computer program product. In a case where real-time power regulation instructions sent by a dispatching central station are received and it is determined that there is an AC filter to be released in an AC filter group, a target direct-current power regulation amount carried in the real-time power regulation instructions is used to obtain a direct-current power regulation limit amount corresponding to the current AC filter group, wherein the direct-current power regulation limit amount is a direct-current power regulation amount that will not cause direct-current power drop, and then the direct-current power regulation limit amount and the target direct-current power regulation amount are compared, and a power regulation strategy corresponding to the comparison result is used to control the direct-current power of a conventional direct-current converter station to be regulated, so that the absolute minimum filter limit is not caused to be not met due to the unavailable AC filter to be released, and then direct-current power drop of the conventional direct-current converter station occurs, and normal power flow regulation and stable operation of a power grid are ensured.

Description

Technical Field

[0001] This application relates to the field of DC power transmission technology, and in particular to a DC power control method, apparatus, computer equipment, storage medium, and computer program product. Background Technology

[0002] With the development of high-voltage direct current transmission technology, in order to compensate for the large amount of reactive power consumed by the thyristor converter valves in the converter station during operation and to suppress the characteristic harmonics injected into the AC grid, corresponding AC filter groups and capacitor groups will be configured in conventional DC converter stations. At the same time, the control system of conventional DC converter stations will also control the AC filter to be put on or off during the power rise and fall process.

[0003] However, AC filters experience a discharge period after being disconnected, during which they become unusable. With the development of the electricity market and the integration of larger-scale renewable energy sources into the grid, the power system needs to adjust grid power flow more rapidly to ensure grid frequency stability. Consequently, the dispatch center will adjust the active power of conventional DC converter stations in real time. Multiple real-time adjustments to the active power of conventional DC converter stations may cause multiple AC filters to disconnect within a short period, becoming unusable during their discharge time. If it is still necessary to increase DC power but no AC filters are available, failing to meet the absolute minimum filter limit, the dispatch center will automatically reduce the transmission power (i.e., DC power drop) to ensure the absolute minimum filter limit is met, preventing damage to the AC filter bank. If DC power drops, it will affect grid power flow regulation and system stability. Summary of the Invention

[0004] Based on this, it is necessary to provide a DC power control method, device, computer equipment, computer-readable storage medium, and computer program product to address the technical problem that the DC power may drop due to the AC filter being unavailable during the DC power control process of the aforementioned conventional DC converter station.

[0005] In a first aspect, this application provides a DC power control method, the method comprising:

[0006] Receives a real-time power adjustment command sent by the central dispatch station; the real-time power adjustment command carries a target DC power adjustment amount;

[0007] When there are AC filters to be released in the AC filter bank, the DC power adjustment limit corresponding to the current AC filter bank is obtained based on the target DC power adjustment amount, wherein the DC power adjustment limit amount is a DC power adjustment amount that will not cause a DC power drop.

[0008] The DC power regulation limit is compared with the target DC power regulation to obtain a comparison result;

[0009] The DC power of the conventional DC converter station is adjusted according to the power regulation strategy corresponding to the comparison results.

[0010] In one embodiment, comparing the DC power regulation limit with the target DC power regulation to obtain a comparison result includes:

[0011] If the DC power regulation limit is greater than or equal to the target DC power regulation, a first comparison result is obtained;

[0012] When the DC power regulation limit is less than the target DC power regulation, a second comparison result is obtained; the comparison result includes the first comparison result and the second comparison result.

[0013] In one embodiment, the step of adjusting the DC power of the conventional DC converter station according to the power adjustment strategy corresponding to the comparison result includes:

[0014] When the comparison result is the first comparison result, the DC power of the conventional DC converter station is adjusted according to the target DC power adjustment amount.

[0015] When the comparison result is the second comparison result, the DC power of the conventional DC converter station is adjusted according to the DC power adjustment limit until there are no AC filters to be released in the AC filter bank, and then the adjustment is switched to the target DC power adjustment amount.

[0016] In one embodiment, obtaining the DC power regulation limit corresponding to the current AC filter bank based on the target DC power regulation amount includes:

[0017] Obtain the current DC power value and current operating mode of the conventional DC converter station;

[0018] Based on the correspondence between the current operating mode and the candidate reactive power switching table, the target reactive power switching table is determined from the candidate reactive power switching table;

[0019] Based on the current DC power value, the target DC power adjustment amount and the target reactive power switching table, the target AC filter corresponding to each target switching stage is obtained;

[0020] Based on the current DC power value and the target AC filter corresponding to each target switching stage, the DC power adjustment limit corresponding to the AC filter bank is obtained.

[0021] In one embodiment, obtaining the DC power regulation limit corresponding to the AC filter bank based on the current DC power value and the target AC filter corresponding to each target switching stage includes:

[0022] Determine whether the target input AC filter corresponding to each target input stage is an AC filter to be released according to the input order of each target input stage;

[0023] If there is an AC filter to be released in the target input AC filter corresponding to the target switching stage, the difference between the upper limit of the DC power adjustment range corresponding to the previous switching stage and the current DC power value shall be used as the DC power adjustment limit for the AC filter group.

[0024] If none of the target input AC filters corresponding to each target switching stage have AC filters to be released, the difference between the upper limit of the DC power adjustment range corresponding to the last target switching stage and the current DC power value is used as the DC power adjustment limit for the AC filter group.

[0025] In one embodiment, the method further includes: determining that the AC filter is an AC filter to be released when the AC filter in the AC filter bank is in a discharge state.

[0026] Secondly, this application also provides a DC power control device, the device comprising:

[0027] The receiving module is used to receive real-time power adjustment instructions sent by the dispatching center; the real-time power adjustment instructions carry the target DC power adjustment amount;

[0028] The acquisition module is used to acquire the DC power adjustment limit amount corresponding to the current AC filter bank based on the target DC power adjustment amount when there is an AC filter to be released in the AC filter bank. The DC power adjustment limit amount is a DC power adjustment amount that will not cause a drop in DC power.

[0029] The comparison module is used to compare the DC power regulation limit with the target DC power regulation to obtain a comparison result;

[0030] The adjustment module is used to control the DC power of the conventional DC converter station to adjust according to the power adjustment strategy corresponding to the comparison result.

[0031] Thirdly, this application also provides a computer device. The computer device includes a memory and a processor, the memory storing a computer program, and the processor executing the computer program to implement the steps of the method described above.

[0032] Fourthly, this application also provides a computer-readable storage medium. The computer-readable storage medium stores a computer program thereon, which, when executed by a processor, implements the steps of the above-described method.

[0033] Fifthly, this application also provides a computer program product. The computer program product includes a computer program that, when executed by a processor, implements the steps of the above-described method.

[0034] The aforementioned conventional DC power control method, device, computer equipment, storage medium, and computer program product, upon receiving a real-time power adjustment command sent by the dispatch center and determining that there are AC filters to be released in the AC filter bank, obtains the DC power adjustment limit corresponding to the current AC filter bank based on the target DC power adjustment amount carried in the real-time power adjustment command. The DC power adjustment limit is a DC power adjustment amount that will not cause a DC power drop. The DC power adjustment limit is then compared with the target DC power adjustment amount, and the DC power of the conventional DC converter station is adjusted according to the power adjustment strategy corresponding to the comparison result. This avoids the phenomenon of DC power drop in the conventional DC converter station due to unavailable AC filters to be released failing to meet the absolute minimum filter limit, thus ensuring normal power flow regulation and stable system operation. Attached Figure Description

[0035] Figure 1 This is an application environment diagram of a conventional DC power control method in one embodiment;

[0036] Figure 2 This is a flowchart illustrating a conventional DC power control method in one embodiment;

[0037] Figure 3 This is a flowchart illustrating the steps for obtaining comparison results in one embodiment;

[0038] Figure 4 This is a flowchart illustrating the adjustment steps according to the power adjustment strategy corresponding to the comparison result in one embodiment.

[0039] Figure 5 This is a flowchart illustrating the steps for obtaining the DC power regulation limit in one embodiment;

[0040] Figure 6 This is a flowchart illustrating the step of obtaining the DC power regulation limit in another embodiment;

[0041] Figure 7 This is a flowchart illustrating a conventional DC power control method in another embodiment;

[0042] Figure 8This is a structural block diagram of a conventional DC power control device in one embodiment;

[0043] Figure 9 This is an internal structural diagram of a computer device in one embodiment. Detailed Implementation

[0044] To make the objectives, technical solutions, and advantages of this application clearer, the following detailed description is provided in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are merely illustrative and not intended to limit the scope of this application.

[0045] The DC power control method provided in this application embodiment can be applied to, for example, Figure 1 In the application environment shown, the dispatch center 102 communicates with the control system 104 of the conventional DC converter station via a network. The data storage system can store the data that the control system 104 of the conventional DC converter station needs to process. The data storage system can be integrated into the control system 104 of the conventional DC converter station, or it can be placed in the cloud or on another network server. Specifically, the control system 104 of the conventional DC converter station receives real-time power adjustment commands sent by the dispatch center 102; the real-time power adjustment commands carry a target DC power adjustment amount; if there are AC filters to be released in the AC filter bank, the DC power adjustment limit amount corresponding to the current AC filter bank is obtained based on the target DC power adjustment amount, wherein the DC power adjustment limit amount is a DC power adjustment amount that will not cause a DC power drop; the DC power adjustment limit amount is compared with the target DC power adjustment amount to obtain a comparison result; and the DC power of the conventional DC converter station is adjusted according to the power adjustment strategy corresponding to the comparison result. The control system 104 of the conventional DC converter station can be a control system installed inside the conventional DC converter station, or it can be a control system independent of the conventional DC converter station, installed outside the station, and connected to the power equipment and the dispatching station 102 in the conventional DC converter station via wireless or wired communication.

[0046] In one embodiment, such as Figure 2 As shown, a DC power control method is provided, which is applied to... Figure 1 The following steps are used as an example to illustrate the control system 104 of a conventional DC converter station:

[0047] S200: Receives real-time power adjustment instructions sent by the central dispatch station; the real-time power adjustment instructions carry the target DC power adjustment amount.

[0048] The real-time power adjustment command is issued by the dispatch center based on the power fluctuations of the power grid. It is used to regulate the active power of the DC converter station to achieve rapid power flow adjustment and maintain grid frequency stability. The real-time power adjustment command carries a target DC power adjustment amount, which is the amount of power adjustment to be made to the active DC power based on the current DC power value of the conventional DC converter station. The target DC power adjustment amount can be positive or negative. A positive value indicates that the active DC power needs to be increased by a corresponding amount, while a negative value indicates that the active DC power needs to be decreased by a corresponding amount.

[0049] It should be noted that the DC power control method provided in this application addresses situations where multiple real-time adjustments to the active power of a conventional DC converter station may cause multiple AC filters to be disconnected within a short period, resulting in an unavailable state corresponding to the discharge time. In this case, if it is still necessary to control and increase DC power but no AC filters are available, the failure to meet the absolute minimum filter limit will cause a drop in DC power. During operation after the DC power drop, the DC power will be unable to continue to reach the target DC power adjustment amount corresponding to the real-time power adjustment command, thus affecting the normal regulation of power grid flow and the stable operation of the system. Accordingly, this application only explains the case where the target DC power adjustment amount is positive.

[0050] Specifically, upon receiving the real-time power regulation command from the central dispatch station, it is necessary to first determine whether there are any AC filters awaiting release in the AC filter bank. If so, the DC power of the conventional DC converter station is directly adjusted according to the real-time power regulation command. However, the corresponding AC filters that need to be put into operation are awaiting release and cannot be immediately put into use. This will result in the number of filters already in operation in the AC filter bank not meeting the absolute minimum filter requirement, i.e., the number of filter banks that must be put into operation to prevent overload of the filtering equipment. In this case, the DC power of the conventional converter station will drop, and since the DC power drop is an irreversible process, it will directly affect the power flow and stable operation of the power grid system.

[0051] Furthermore, the method for determining whether there is an AC filter to be released in the AC filter bank is not unique. It can be based on the AC filter's cut-off time or whether the AC filter is in a discharging state. For example, a timer can be started simultaneously with the cut-off signal issued to an AC filter. If the timer duration is still within the corresponding discharging duration of the AC filter, the AC filter is determined to be a filter to be released. Only when the timer duration exceeds the corresponding discharging duration can the AC filter be determined not to be a filter to be released. Alternatively, the method can be based on collecting the electrical parameters of the AC filter to determine whether its operating state is in a discharging state. In one embodiment, the method further includes: determining that an AC filter is a filter to be released when the AC filter in the AC filter bank is in a discharging state.

[0052] It is understandable that if there is no AC filter to be released in the AC filter bank, the DC power of the conventional DC converter station can be directly controlled to adjust according to the target DC power adjustment amount.

[0053] S400: When there is an AC filter to be released in the AC filter bank, obtain the DC power regulation limit corresponding to the current AC filter bank based on the target DC power regulation amount.

[0054] Among them, the DC power regulation limit is the DC power regulation amount that will not cause a drop in DC power. Therefore, when adjusting the DC power of a conventional DC converter station based on the DC power regulation limit, it can be ensured that the DC power of the conventional converter station will not drop due to failure to meet the minimum filter limit.

[0055] Specifically, the target AC filter to be put into operation can be obtained first based on the target DC power adjustment amount, and then the DC power adjustment limit corresponding to the current AC filter bank can be obtained based on the operating status of the target AC filter.

[0056] S600: Compares the DC power regulation limit with the target DC power regulation to obtain the comparison result.

[0057] Specifically, the DC power regulation limit needs to be compared with the target DC power regulation to determine whether directly using the target DC power regulation to control the DC power of the conventional DC converter station will cause a DC power drop. Correspondingly, the comparison result can either indicate that directly using the target DC power regulation to control the DC power of the conventional DC converter station will not cause a DC power drop, or that directly using the target DC power regulation to control the DC power of the conventional DC converter station will cause a DC power drop.

[0058] S800: Adjusts the DC power of a conventional DC converter station according to the power regulation strategy corresponding to the comparison results.

[0059] Specifically, when the comparison results indicate that directly adjusting the DC power of a conventional DC converter station using the target DC power adjustment amount will not cause a drop in DC power, the corresponding power adjustment strategy can be to directly adjust the DC power of the conventional DC converter station using the target DC power adjustment amount. When the comparison results indicate that directly adjusting the DC power of a conventional DC converter station using the target DC power adjustment amount will cause a drop in DC power, the corresponding power adjustment strategy can be to first adjust the DC power of the conventional DC converter station using a DC power adjustment limit, while simultaneously monitoring the operating status of the target activated AC filters. Then, when it is detected that none of the target activated AC filters are among the filters to be released, the system can switch to adjusting according to the target DC power adjustment amount.

[0060] The aforementioned conventional DC power control method, upon receiving a real-time power adjustment command from the dispatch center and determining that there are AC filters to be released in the AC filter bank, obtains the DC power adjustment limit corresponding to the current AC filter bank based on the target DC power adjustment amount carried in the real-time power adjustment command. This DC power adjustment limit is a DC power adjustment amount that will not cause a DC power drop. The DC power adjustment limit is then compared with the target DC power adjustment amount. Based on the power adjustment strategy corresponding to the comparison result, the DC power of the conventional DC converter station is adjusted to avoid the DC power drop phenomenon caused by unavailable AC filters to be released, which would result in failure to meet the absolute minimum filter limit and ensure normal power flow regulation and stable system operation.

[0061] In one embodiment, such as Figure 3 As shown, S600 includes the following S620 to S640, wherein:

[0062] S620: When the DC power regulation limit is greater than or equal to the target DC power regulation, a first comparison result is obtained. It can be understood that the first comparison result indicates that directly using the target DC power regulation to control the DC power of a conventional DC converter station will not cause a drop in DC power.

[0063] Correspondingly, in one embodiment, such as Figure 4 As shown, S800 includes S820: when the comparison result is the first comparison result, the DC power of the conventional DC converter station is adjusted according to the target DC power adjustment amount. The method for adjusting the DC power of the conventional DC converter station can be performed using methods commonly used by those skilled in the art, and will not be described in detail in the embodiments of this application.

[0064] S640: When the DC power regulation limit is less than the target DC power regulation, a second comparison result is obtained; the comparison result includes the first comparison result and the second comparison result. It can be understood that the second comparison result indicates that directly using the target DC power regulation to control the DC power of a conventional DC converter station will cause a decrease in DC power.

[0065] Correspondingly, in one embodiment, such as Figure 4 As shown, S800 also includes S840: when the comparison result is the second comparison result, the DC power of the conventional DC converter station is adjusted according to the DC power adjustment limit until there are no AC filters to be released in the AC filter bank, and then the adjustment is switched to the target DC power adjustment. It can be understood that before switching to the target DC power adjustment, the previous power adjustment must be completed, meaning the DC power of the conventional DC converter station has been adjusted according to the DC power adjustment limit.

[0066] In one embodiment, such as Figure 5 As shown, S400 obtains the DC power regulation limit corresponding to the current AC filter bank based on the target DC power regulation amount, including the following S420 to S480, wherein:

[0067] S420: Obtain the current DC power value and current operating mode of a conventional DC converter station.

[0068] Specifically, the method for obtaining the current DC power value of a conventional DC converter station is not unique. It can be obtained directly through the existing data monitoring system of the conventional DC converter station, or it can be obtained by adding a power acquisition device. The operating modes of a conventional DC converter station can mainly include three types: bipolar, monopolar metallic, and monopolar. The current operating mode of a conventional DC converter station can be any of the above-mentioned preset operating modes, which can be selected and preset in the control system of the conventional DC converter station according to its operating requirements.

[0069] S440: Determine the target reactive power switching table from the candidate reactive power switching table based on the correspondence between the current operating mode and the candidate reactive power switching table.

[0070] It is understandable that each operating mode of a conventional DC converter station corresponds to a recommended AC filter switching strategy table, i.e., a reactive power switching table. The candidate reactive power switching table can be understood as a table of recommended AC filter switching strategies under three operating modes: bipolar full-voltage, monopolar metallic, and monopolar full-voltage. For example, Table 1 below shows the recommended AC filter switching strategies for a conventional DC converter station under bipolar full-voltage operating mode.

[0071] Table 1. Schematic diagram of recommended AC filter switching strategies under bipolar full-voltage operation mode.

[0072]

[0073]

[0074] Specifically, after obtaining the current operating mode of the conventional DC converter station, the target reactive power switching table can be determined from the candidate reactive power switching table based on the correspondence between the current operating mode and the candidate reactive power switching table.

[0075] S460: Based on the current DC power value, the target DC power adjustment amount, and the target reactive power switching table, obtain the target input AC filter corresponding to each target switching stage.

[0076] It is understandable that the activation or deactivation of AC filter banks generally depends on the reactive power absorbed by the converter valves of a conventional DC converter station from the AC grid. When the reactive power consumed by the converter valves exceeds the upper limit of a preset range, the control system of the conventional DC converter station will issue a control signal to activate the AC filter banks. Conversely, when the reactive power consumed by the converter valves is lower than the lower limit of the preset range, the control system of the conventional DC converter station will issue a control signal to deactivate the AC filter banks. The preset range used for activation and deactivation is generally derived by dividing the maximum fluctuation range of the reactive power consumed by the converter valves of the conventional DC converter station into multiple preset ranges, corresponding to multiple activation / deactivation stages of the AC filter banks.

[0077] Specifically, the target switching stage refers to the AC filter bank that needs to be switched on to meet the absolute minimum filter capacity limit when the DC power of a conventional DC converter station is adjusted according to the target DC power adjustment amount. It can be understood that the number of target switching stages may be zero, one, or two or more, and needs to be determined based on the actual values ​​of the current DC power value and the target DC power adjustment amount, as well as the actual reactive power switching table.

[0078] Furthermore, the DC power value corresponds to the DC load level displayed in the reactive power switching table. Therefore, S460 can first determine the current switching stage of the AC filter bank in the target reactive power switching table based on the current DC power value. Then, based on the current DC power value and the target DC power adjustment amount, it determines the final switching stage of the AC filter bank after the DC power of the conventional DC converter station is adjusted according to the target DC power adjustment amount in the target reactive power switching table. The switching stages between the current switching stage and the final switching stage can then correspond to the target switching stages, and the target AC filter corresponding to each target switching stage can be found by querying the target reactive power switching table.

[0079] Taking the reactive power switching table shown in Table 1 as the target switching table, with the current DC power value corresponding to a DC load level of 15% and the target DC power adjustment corresponding to a DC load level adjustment of 60% as an example, we can first determine that the current switching stage is the first switching stage based on the current DC power value corresponding to a DC load level of 15%. Then, combined with the target DC power adjustment corresponding to a DC load level adjustment of 60%, we know that the last switching stage is the fourth switching stage. Therefore, we can determine the target switching stages as the second to fourth switching stages.

[0080] S480: Based on the current DC power value and the target AC filter corresponding to each target switching stage, obtain the DC power regulation limit corresponding to the AC filter bank.

[0081] Specifically, each target switching stage includes a switching sequence. For example, it may be necessary to start from the first switching stage and switch sequentially up to the fourth switching stage. Then, based on the switching sequence of each target switching stage, it can be determined whether the target input AC filter corresponding to each target switching stage is the AC filter to be released, and thus determine which target switching stage to use to determine the DC power regulation limit.

[0082] In one embodiment, such as Figure 6 As shown, S480 includes the following S482 to S486, wherein:

[0083] S482: Determine whether the target input AC filter corresponding to each target input stage is an AC filter to be released according to the input order of each target input stage.

[0084] Specifically, when determining whether the target input AC filter corresponding to each target switching stage is a target AC filter to be released, it is sufficient to determine whether each target switching stage corresponds to a different target input AC filter. For example, taking Table 1 as an example, the target input AC filters corresponding to the first switching stage include one type A filter and one type B AC filter. After determining that the AC filter group contains one type A filter and one type B AC filter that do not belong to the target AC filter to be released, the second switching stage only needs to continue to determine whether the AC filter group contains one type C filter that does not belong to the target AC filter to be released, without repeating the determination for type A and type B AC filters.

[0085] S484: If there is an AC filter to be released in the target input AC filter corresponding to the current input stage, the difference between the upper limit of the DC power adjustment range corresponding to the previous input stage and the current DC power value shall be used as the DC power adjustment limit for the AC filter bank.

[0086] Specifically, if there are AC filters to be released in the target AC filter bank corresponding to the target switching stage, this indicates that when the DC power of the conventional DC converter station is adjusted to the target switching stage, the AC filter bank will not be able to meet the absolute minimum filter capacity limit, which may cause a drop in DC power in the conventional DC converter station. Therefore, the difference between the upper limit of the DC power adjustment range corresponding to the previous switching stage and the current DC power value should be used as the DC power adjustment limit for the AC filter bank.

[0087] S486: When there are no AC filters to be released in the target input AC filters corresponding to each target switching stage, the difference between the upper limit of the DC power adjustment range corresponding to the last target switching stage and the current DC power value shall be used as the DC power adjustment limit for the AC filter bank.

[0088] Specifically, when there are no AC filters to be released for the target switching stages, indicating that the DC power of a conventional DC converter station is adjusted to the last target switching stage, the AC filter bank can meet the absolute minimum filter capacity limit and will not cause a DC power drop in the conventional DC converter station. Therefore, the difference between the upper limit of the DC power adjustment range corresponding to the last target switching stage and the current DC power value can be used as the DC power adjustment limit for the AC filter bank.

[0089] The following is Figure 7 Taking the flowchart shown as an example, the DC power control method provided in this application will be explained, mainly including the following steps 1 to 6, wherein:

[0090] Step 1: The conventional DC converter station receives the real-time power adjustment command ΔP (target DC power adjustment amount) sent by the dispatch center.

[0091] Step 2: Determine if the exit time of the previous AC filter is greater than 10 minutes (discharge time), i.e., whether an AC filter is in a discharge state. A counter is used; each time an AC filter exits, the counter is reset to zero and restarts. When the counter exceeds 10 minutes, it is considered that the exit time of the previous AC filter has exceeded 10 minutes.

[0092] Step 3: Execute different logic based on the exit time of the previous AC filter. If the AC filter exit time is greater than 10 minutes, the DC system executes the real-time power adjustment command ΔP. If the AC filter exit time is less than 10 minutes, execute Step 4.

[0093] Step 4: Based on the current DC active power P0 and the current operating mode, calculate the adjustable limit ΔP of DC power that will not trigger the filter to engage. lim(DC power adjustment limit). Based on the current DC operating mode and the current DC active power P0, and in conjunction with the reactive power switching table, find the next AC filter switching power point P1 that is closest to the current power point. The adjustable DC power limit ΔP. lim =P1-P0.

[0094] Step 5: Based on the real-time power adjustment command ΔP and the DC adjustable power limit ΔP lim The magnitude of the value determines the DC power regulation. If the real-time power regulation command ΔP is less than the DC adjustable power limit ΔP, then the DC power regulation is executed. lim The DC system executes a real-time power adjustment command ΔP; if the real-time power adjustment command ΔP is greater than the DC adjustable power limit ΔP. lim DC executes real-time power regulation command ΔP lim Meanwhile, continue with step 6.

[0095] Step 6: Wait for the previous power adjustment to finish and for the previous AC filter to exit for more than 10 minutes before executing the DC power adjustment command (ΔP-ΔP). lim This ensures that the final adjustment of DC power meets the requirements of the real-time power regulation command.

[0096] In this embodiment, not only can the DC power of a conventional DC converter station be adjusted more quickly, but the unavailability of the AC filter during the real-time adjustment of conventional DC power is also avoided, thus ensuring the stability of the real-time adjustment of conventional DC power.

[0097] It should be understood that although the steps in the flowcharts of the embodiments described above are shown sequentially according to the arrows, these steps are not necessarily executed in the order indicated by the arrows. Unless explicitly stated herein, there is no strict order restriction on the execution of these steps, and they can be executed in other orders. Moreover, at least some steps in the flowcharts of the embodiments described above may include multiple steps or multiple stages. These steps or stages are not necessarily completed at the same time, but can be executed at different times. The execution order of these steps or stages is not necessarily sequential, but can be performed alternately or in turn with other steps or at least some of the steps or stages of other steps.

[0098] Based on the same inventive concept, this application also provides a DC power control device for implementing the DC power control method described above. The solution provided by this device is similar to the implementation described in the above method; therefore, the specific limitations in one or more DC power control device embodiments provided below can be found in the limitations of the DC power control method described above, and will not be repeated here.

[0099] In one embodiment, such as Figure 8 As shown, a DC power control device is provided, including: a receiving module 110, an acquisition module 120, a comparison module 130, and an adjustment module 140, wherein:

[0100] The receiving module 110 is used to receive real-time power adjustment instructions sent by the dispatching station; the real-time power adjustment instructions carry the target DC power adjustment amount;

[0101] The acquisition module 120 is used to acquire the DC power regulation limit of the current AC filter bank based on the target DC power regulation amount when there is an AC filter to be released in the AC filter bank. The DC power regulation limit is a DC power regulation amount that will not cause a drop in DC power.

[0102] Comparison module 130 is used to compare the DC power regulation limit with the target DC power regulation to obtain a comparison result;

[0103] The adjustment module 140 is used to adjust the DC power of a conventional DC converter station according to the power adjustment strategy corresponding to the comparison result.

[0104] In one embodiment, the comparison module 130 is further configured to obtain a first comparison result when the DC power adjustment limit is greater than or equal to the target DC power adjustment; and to obtain a second comparison result when the DC power adjustment limit is less than the target DC power adjustment; the comparison result includes the first comparison result and the second comparison result.

[0105] In one embodiment, the adjustment module 140 is further configured to, when the comparison result is a first comparison result, control the DC power of the conventional DC converter station to be adjusted according to the target DC power adjustment amount; and when the comparison result is a second comparison result, control the DC power of the conventional DC converter station to be adjusted according to the DC power adjustment limit amount until there are no AC filters to be released in the AC filter bank, and switch to adjustment according to the target DC power adjustment amount.

[0106] In one embodiment, the acquisition module 120 is further configured to acquire the current DC power value and current operating mode of the conventional DC converter station; determine the target reactive power switching table from the candidate reactive power switching table according to the correspondence between the current operating mode and the candidate reactive power switching table; obtain the target AC filter corresponding to each target switching stage based on the current DC power value, the target DC power adjustment amount and the target reactive power switching table; and obtain the DC power adjustment limit amount corresponding to the AC filter group based on the current DC power value and the target AC filter corresponding to each target switching stage.

[0107] In one embodiment, the acquisition module 120 is further configured to determine whether the target input AC filter corresponding to each target switching stage is an AC filter to be released according to the switching order of each target switching stage; if there is an AC filter to be released in the target input AC filter corresponding to the current target switching stage, the difference between the upper limit of the DC power adjustment range corresponding to the previous switching stage and the current DC power value is used as the DC power adjustment limit amount corresponding to the AC filter group; if there is no AC filter to be released in the target input AC filters corresponding to each target switching stage, the difference between the upper limit of the DC power adjustment range corresponding to the last target switching stage and the current DC power value is used as the DC power adjustment limit amount corresponding to the AC filter group.

[0108] In one embodiment, the apparatus further includes:

[0109] The judgment module is used to determine whether an AC filter is an AC filter to be released when the AC filter in the AC filter bank is in a discharge state.

[0110] In this embodiment, upon receiving a real-time power adjustment command from the dispatch center and determining that there are AC filters to be released in the AC filter bank, the DC power adjustment limit corresponding to the current AC filter bank is obtained based on the target DC power adjustment amount carried in the real-time power adjustment command. The DC power adjustment limit is a DC power adjustment amount that will not cause a DC power drop. The DC power adjustment limit is then compared with the target DC power adjustment amount. Based on the power adjustment strategy corresponding to the comparison result, the DC power of the conventional DC converter station is adjusted to avoid the DC power drop at the conventional DC converter station due to unavailable AC filters failing to meet the absolute minimum filter limit, thus ensuring normal power flow regulation and stable system operation.

[0111] Each module in the aforementioned DC power control device can be implemented entirely or partially through software, hardware, or a combination thereof. These modules can be embedded in the processor of a computer device in hardware form or independent of it, or stored in the memory of a computer device in software form, so that the processor can call and execute the operations corresponding to each module.

[0112] In one embodiment, a computer device is provided, which may be a server, and its internal structure diagram may be as follows: Figure 9As shown, this computer device includes a processor, memory, input / output (I / O) interfaces, and a communication interface. The processor, memory, and I / O interfaces are connected via a system bus, and the communication interface is also connected to the system bus via the I / O interfaces. The processor provides computational and control capabilities. The memory includes non-volatile storage media and internal memory. The non-volatile storage media stores the operating system, computer programs, and a database. The internal memory provides the environment for the operating system and computer programs stored in the non-volatile storage media. The database stores data such as target DC power regulation values, DC power regulation limits, comparison results, and corresponding power regulation strategies. The I / O interfaces are used for information exchange between the processor and external devices. The communication interface is used for communication with external terminals via a network connection. When executed by the processor, the computer program implements a DC power control method.

[0113] Those skilled in the art will understand that Figure 9 The structure shown is merely a block diagram of a portion of the structure related to the present application and does not constitute a limitation on the computer device to which the present application is applied. Specific computer devices may include more or fewer components than those shown in the figure, or combine certain components, or have different component arrangements.

[0114] In one embodiment, a computer device is provided, including a memory and a processor, wherein the memory stores a computer program, and the processor executes the computer program to implement the steps of the method described above.

[0115] In one embodiment, a computer-readable storage medium is provided having a computer program stored thereon, which, when executed by a processor, implements the steps of the method described above.

[0116] In one embodiment, a computer program product is provided, including a computer program that, when executed by a processor, implements the steps of the method described above.

[0117] It should be noted that the user information (including but not limited to user device information, user personal information, etc.) and data (including but not limited to data used for analysis, data stored, data displayed, etc.) involved in this application are all information and data authorized by the user or fully authorized by all parties, and the collection, use and processing of the relevant data shall comply with the relevant laws, regulations and standards of the relevant countries and regions.

[0118] Those skilled in the art will understand that all or part of the processes in the methods of the above embodiments can be implemented by a computer program instructing related hardware. The computer program can be stored in a non-volatile computer-readable storage medium, and when executed, it can include the processes of the embodiments of the above methods. Any references to memory, databases, or other media used in the embodiments provided in this application can include at least one of non-volatile and volatile memory. Non-volatile memory can include read-only memory (ROM), magnetic tape, floppy disk, flash memory, optical memory, high-density embedded non-volatile memory, resistive random access memory (ReRAM), magnetic random access memory (MRAM), ferroelectric random access memory (FRAM), phase change memory (PCM), graphene memory, etc. Volatile memory can include random access memory (RAM) or external cache memory, etc. By way of illustration and not limitation, RAM can take many forms, such as Static Random Access Memory (SRAM) or Dynamic Random Access Memory (DRAM). The databases involved in the embodiments provided in this application may include at least one type of relational database and non-relational database. Non-relational databases may include, but are not limited to, blockchain-based distributed databases. The processors involved in the embodiments provided in this application may be general-purpose processors, central processing units, graphics processing units, digital signal processors, programmable logic devices, quantum computing-based data processing logic devices, etc., and are not limited to these.

[0119] The technical features of the above embodiments can be combined in any way. For the sake of brevity, not all possible combinations of the technical features in the above embodiments are described. However, as long as there is no contradiction in the combination of these technical features, they should be considered to be within the scope of this specification.

[0120] The embodiments described above are merely illustrative of several implementation methods of this application, and while the descriptions are specific and detailed, they should not be construed as limiting the scope of this patent application. It should be noted that those skilled in the art can make various modifications and improvements without departing from the concept of this application, and these all fall within the protection scope of this application. Therefore, the protection scope of this application should be determined by the appended claims.

Claims

1. A DC power control method, characterized in that, The method includes: Receives a real-time power adjustment command sent by the central dispatch station; the real-time power adjustment command carries a target DC power adjustment amount; When there are AC filters to be released in the AC filter bank, the current DC power value and current operating mode of the conventional DC converter station are obtained. Based on the correspondence between the current operating mode and the candidate reactive power switching table, the target reactive power switching table is determined from the candidate reactive power switching table. Based on the current DC power value, the target DC power adjustment amount, and the target reactive power switching table, the target AC filters corresponding to each target switching stage are obtained. Based on the current DC power value and the target AC filters corresponding to each target switching stage, the DC power adjustment limit amount corresponding to the current AC filter bank is obtained, wherein the DC power adjustment limit amount is a DC power adjustment amount that will not cause a DC power drop. If the AC filter in the AC filter bank is in a discharging state, it is determined that the AC filter belongs to the AC filters to be released. The DC power regulation limit is compared with the target DC power regulation to obtain a comparison result; The DC power of the conventional DC converter station is adjusted according to the power regulation strategy corresponding to the comparison results.

2. The method according to claim 1, characterized in that, The step of comparing the DC power regulation limit with the target DC power regulation to obtain a comparison result includes: If the DC power regulation limit is greater than or equal to the target DC power regulation, a first comparison result is obtained; When the DC power regulation limit is less than the target DC power regulation, a second comparison result is obtained; the comparison result includes the first comparison result and the second comparison result.

3. The method according to claim 2, characterized in that, The step of controlling the DC power of the conventional DC converter station to adjust according to the power adjustment strategy corresponding to the comparison result includes: When the comparison result is the first comparison result, the DC power of the conventional DC converter station is adjusted according to the target DC power adjustment amount. When the comparison result is the second comparison result, the DC power of the conventional DC converter station is adjusted according to the DC power adjustment limit until there are no AC filters to be released in the AC filter bank, and then the adjustment is switched to the target DC power adjustment amount.

4. The method according to claim 1, characterized in that, The conventional DC converter station operates in three modes: bipolar, monopolar metallic, and monopolar. The candidate reactive power switching table includes recommended AC filter switching strategies for the bipolar, monopolar metallic, and monopolar operating modes.

5. The method according to claim 1, characterized in that, The step of obtaining the DC power regulation limit corresponding to the AC filter bank based on the current DC power value and the target AC filter corresponding to each target switching stage includes: Determine whether the target input AC filter corresponding to each target input stage is an AC filter to be released according to the input order of each target input stage; If there is an AC filter to be released in the target input AC filter corresponding to the target switching stage, the difference between the upper limit of the DC power adjustment range corresponding to the previous switching stage and the current DC power value shall be used as the DC power adjustment limit for the AC filter group. If none of the target input AC filters corresponding to each target switching stage have AC filters to be released, the difference between the upper limit of the DC power adjustment range corresponding to the last target switching stage and the current DC power value is used as the DC power adjustment limit for the AC filter group.

6. The method according to any one of claims 1 to 5, characterized in that, The method further includes: Simultaneously, a timer is started to keep track while a cut-off signal is sent to a certain AC filter; When the timing duration is within the discharge duration corresponding to the AC filter, the AC filter is determined to be an AC filter to be released. When the timing duration exceeds the discharge duration, it is determined that the AC filter does not belong to the AC filter to be released.

7. A DC power control device, characterized in that, The device includes: The receiving module is used to receive real-time power adjustment instructions sent by the dispatching center; the real-time power adjustment instructions carry the target DC power adjustment amount; The acquisition module is used to, when there are AC filters to be released in the AC filter bank, acquire the current DC power value and current operating mode of the conventional DC converter station; determine the target reactive power switching table from the candidate reactive power switching table based on the correspondence between the current operating mode and the candidate reactive power switching table; obtain the target AC filter corresponding to each target switching stage based on the current DC power value, the target DC power adjustment amount, and the target reactive power switching table; and obtain the DC power adjustment limit amount corresponding to the current AC filter bank based on the current DC power value and the target AC filter corresponding to each target switching stage, wherein the DC power adjustment limit amount is a DC power adjustment amount that will not cause a DC power drop; and determine that the AC filter is an AC filter to be released if the AC filter in the AC filter bank is in a discharging state. The comparison module is used to compare the DC power regulation limit with the target DC power regulation to obtain a comparison result; The adjustment module is used to control the DC power of the conventional DC converter station to adjust according to the power adjustment strategy corresponding to the comparison result.

8. A computer device comprising a memory and a processor, wherein the memory stores a computer program, characterized in that, When the processor executes the computer program, it implements the steps of the method according to any one of claims 1 to 6.

9. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

10. A computer program product, comprising a computer program, characterized in that, When the computer program is executed by a processor, it implements the steps of the method according to any one of claims 1 to 6.

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