Control Method, System, Electronic Device and Storage Medium for Reactive Power of Multi-Area Network-Forming Equipment

Abstract

The present application provides a control method, system, electronic device, and storage medium for the reactive power of a multi-region network-forming device. The control method includes: obtaining the substation bus voltage data of each network-forming device in multiple regions of the power system and the reactive power data of each network-forming device; obtaining the bus voltage data of the voltage central point of the power system; determining the basic adjustment amount of each network-forming device according to the reactive power data of each network-forming device, so as to adjust the substation bus voltage of each network-forming device according to the basic adjustment amount; when the bus voltage data of the voltage central point satisfies the first preset condition, determining the closed-loop adjustment amount according to the substation bus voltage data and the reactive power data, so as to adjust the bus voltage of the voltage central point according to the closed-loop adjustment amount; when the bus voltage data of the voltage central point and the reactive power data of any one network-forming device satisfy the second preset condition, determining the balance adjustment amount according to the basic adjustment amount and the reactive power data, so as to adjust the reactive power of each network-forming device according to the balance adjustment amount.

Description

Technical Field

[0001] The present application relates to the technical field of networking equipment, and in particular to a method, system, electronic device and storage medium for controlling reactive power of multi-region networking equipment. Background Art

[0002] A high-proportion new energy power system refers to the large-scale access and utilization of renewable energy such as wind and solar energy in the power system to achieve clean and low-carbon power supply. A high-proportion new energy power system mainly provides voltage support through grid-building equipment, and for large-capacity systems, grid-building equipment needs to be configured in each area to stabilize the voltage in each area.

[0003] Due to the access of a high proportion of new energy, the dual fluctuations of source and load will cause the voltage of the power system to fluctuate frequently and significantly, and the grid-forming equipment generally adopts the voltage reactive droop characteristics to autonomously respond and maintain the voltage in the area, which will cause the bus voltage at the central point of the power system to deviate. In addition, the power supply differences in various areas of the power system may also cause the reactive power between various grid-forming equipment to differ too much. When disturbances occur, some grid-forming equipment will have the problem of premature overload, thereby weakening its voltage support capacity. The instability of bus voltage and the change of reactive power will seriously affect the voltage stability of the power system.

[0004] At present, the bus voltage and the reactive power of each network-forming device are generally controlled by an AVC (Automatic Voltage Control) controller. However, the inventors found that, on the one hand, the conventional AVC controller is based on the server or workstation hardware for corresponding control, and it cannot directly collect voltage information and reactive power information. It needs to obtain voltage information and reactive power information from an independent measurement and control device based on communication. There are problems with slow voltage tracking response and poor accuracy; on the other hand, the communication between the conventional AVC controller and each control device needs to be converted through the communication management mechanism, and there are problems with long communication time and easy signal interruption, which will directly affect the reliability of the AVC controller. Therefore, the inventors believe that the conventional AVC controller cannot meet the voltage control requirements of a high-proportion new energy power system.

[0005] In addition, the current coordinated reactive power control method of grid-type equipment aims to focus on the voltage control of grid-type equipment on the same bus and the reactive power balance between converters. It is not suitable for coordinated control between multi-area grid-type equipment in large-capacity scenarios. Summary of the invention

[0006] According to one aspect of the present application, the present application provides a method for controlling the reactive power of a multi-region network-forming device. The control method includes: obtaining the bus voltage data of the collection stations of each network-forming device in multiple regions of the power system and the reactive power data of each network-forming device; obtaining the bus voltage data of the voltage central point of the power system; determining the basic adjustment amount of each network-forming device according to the reactive power data of each network-forming device, so as to adjust the bus voltage of the collection station of each network-forming device according to the basic adjustment amount; when the bus voltage data of the voltage central point satisfies the first preset condition, determining the closed-loop adjustment amount according to the bus voltage data of the collection station and the reactive power data, so as to adjust the bus voltage of the voltage central point according to the closed-loop adjustment amount; when the bus voltage data of the voltage central point and the reactive power data of any one network-forming device satisfy the second preset condition, determining the balance adjustment amount according to the basic adjustment amount and the reactive power data, so as to adjust the reactive power of each network-forming device according to the balance adjustment amount.

[0007] According to some embodiments of the present application, determining the basic adjustment amount of each network-forming device according to the reactive power data of each network-forming device includes: determining the maximum reactive power data of each network-forming device and the total reactive power data of all network-forming devices in multiple regions according to the reactive power data of each network-forming device; determining the basic adjustment amount according to the maximum reactive power data and the total reactive power data.

[0008] According to some embodiments of the present application, the calculation formula for determining the basic adjustment amount according to the maximum reactive power data and the total reactive power data is:

[0009]

[0010] wherein, Q total is the total reactive power data, Q i is the reactive power data of the network-forming device in the i-th region, is the basic adjustment amount of the network-forming device in the i-th region,

[0011] is the maximum reactive power of the network-forming device in the i-th region, and n is the number of regions in multiple regions.

[0012] According to some embodiments of the present application, the first preset condition is:

[0013] U t > U set + ΔU

[0014] U t < U set - ΔU

[0015] wherein, U t is the bus voltage data of the voltage central point, Uset is the preset value of the bus voltage at the voltage central point, and ΔU is the preset value of voltage over-limit; determining the closed-loop regulation amount according to the bus voltage data and reactive power data of the collection station includes: determining the voltage increase coefficient and the voltage decrease coefficient according to the bus voltage data and reactive power data of the collection station; determining the closed-loop regulation amount according to the voltage increase coefficient or the voltage decrease coefficient.

[0016] According to some embodiments of the present application, the calculation formula of the voltage increase coefficient is:

[0017]

[0018] where m i is the voltage increase coefficient of the network-forming equipment in the i-th area, K qv.i is the reactive voltage coefficient U of the network-forming equipment in the i-th area i is the bus voltage data of the collection station of the network-forming equipment in the i-th area, U high is the high value of the bus voltage data U is the maximum value of the bus voltage data of the collection station, Q max is the maximum reactive power of the network-forming equipment in the i-th area, Q max is the reactive power of the network-forming equipment in the i-th area, K i is the margin coefficient. set

[0019]

[0019] According to some embodiments of the present application, the calculation formula of the voltage decrease coefficient is:

[0020]

[0021] where n i is the voltage decrease coefficient of the network-forming equipment in the i-th area, K qv.i is the reactive voltage coefficient of the network-forming equipment in the i-th area, U low is the low value of the bus voltage data of the collection station, U i is the bus voltage data of the collection station of the network-forming equipment in the i-th area, U min is the minimum value of the bus voltage data of the collection station, Q max is the maximum reactive power of the network-forming equipment in the i-th area, Q i is the reactive power of the network-forming equipment in the i-th area, K set is the margin coefficient.

[0022] According to some embodiments of the present application, the calculation formula for determining the closed-loop regulation amount according to the voltage increase coefficient or the voltage decrease coefficient is:

[0023]

[0024] where is the closed-loop regulation amount of the network-forming device in the i-th area, is the closed-loop regulation amount of the network-forming device in the i-th area in the previous control cycle, U set is the preset value of the bus voltage at the voltage central point, U t is the bus voltage data of the voltage central point, and Δε is the voltage regulation dead zone.

[0025] According to some embodiments of the present application, the second preset condition is that the bus voltage data of the voltage central point satisfies the following formula:

[0026] U set -k set ΔU < U t < U set +k set ΔU

[0027] and the reactive power data of any network-forming device does not satisfy the following formula:

[0028]

[0029] where U set is the preset value of the bus voltage at the voltage central point, K set is the margin coefficient, ΔU is the preset value of voltage over-limit, U t is the bus voltage data of the voltage central point, is the basic regulation amount of the network-forming device in the i-th area, ΔQ is the preset value of reactive power balance, Q i is the reactive power of the network-forming device in the i-th area;

[0030] The calculation formula of the balance regulation amount is:

[0031]

[0032] where is the balance regulation amount of the network-forming device in the i-th area, k p is the proportional coefficient, k i is the integral coefficient, S is a complex variable, is the basic regulation amount of the network-forming device in the i-th area, Q i is the reactive power of the network-forming device in the i-th area.

[0033] According to another aspect of the present application, the present application provides a control system for the reactive power of a multi-region network-forming device. The control system includes a data acquisition module, a basic adjustment amount processing module, a closed-loop adjustment amount processing module, and an equalization adjustment amount processing module. The data acquisition module acquires the bus voltage data of the collection stations of each network-forming device in multiple regions of the power system and the reactive power data of each network-forming device; acquires the bus voltage data of the voltage central point of the power system; the basic adjustment amount processing module determines the basic adjustment amount of each network-forming device according to the reactive power data of each network-forming device, so as to adjust the bus voltage of the collection station of each network-forming device according to the basic adjustment amount; the closed-loop adjustment amount processing module determines the closed-loop adjustment amount according to the bus voltage data and the reactive power data when the bus voltage data of the voltage central point satisfies the first preset condition, so as to adjust the bus voltage of the voltage central point according to the closed-loop adjustment amount; the equalization adjustment amount processing module determines the equalization adjustment amount according to the basic adjustment amount and the reactive power data when the bus voltage data of the voltage central point and the reactive power data of any one network-forming device satisfy the second preset condition, so as to adjust the reactive power of each network-forming device according to the equalization adjustment amount.

[0034] According to yet another aspect of the present application, the present application further provides an electronic device. The electronic device includes: one or more processors; a storage device for storing one or more programs, which when executed by the one or more processors, enable the one or more processors to implement the control method as described above.

[0035] According to yet another aspect of the present application, the present application further provides a non-volatile computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by a processor, it can implement the control method as described above.

[0036] The present application calculates the basic adjustment amount, the closed-loop adjustment amount, and the equalization adjustment amount respectively through the acquired bus voltage data of the collection stations of each network-forming device, the reactive power data of each network-forming device, and the bus voltage data of the voltage central point, so as to adjust the bus voltage of the collection station of each network-forming device according to the basic adjustment amount, adjust the bus voltage of the voltage central point according to the closed-loop adjustment amount, and adjust the reactive power of each network-forming device according to the equalization adjustment amount.

[0037] By adjusting and controlling the reactive power of each network-forming device, the present application can quickly adjust the bus voltage of the voltage central point, thereby improving the voltage regulation speed after a disturbance occurs. The present application also controls the deviation of the bus voltage of the voltage central point through closed-loop control, which can improve the power supply quality of the power system, and by equalizing the reactive power between each network-forming device, it can enhance the support ability of the transient voltage of the power system, thereby enhancing the support strength of the new energy power system. Description of the Drawings

[0038] To more clearly illustrate the technical solutions in the embodiments of the present application, the following will briefly introduce the drawings required for the description of the embodiments. Obviously, the drawings in the following description are only some embodiments of the present application. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0039] Figure 1 A flowchart showing the control method of the embodiments of the present application;

[0040] Figure 2 A schematic diagram showing the power system of the embodiments of the present application;

[0041] Figure 3 Another flowchart showing the control method of the embodiments of the present application;

[0042] Figure 4 A schematic diagram showing the regulation of the bus voltage of the voltage central point in the embodiments of the present application;

[0043] Figure 5 Another flowchart showing the control method of the embodiments of the present application;

[0044] Figure 6 A schematic diagram showing the regulation of the reactive power of the network-forming equipment in the embodiments of the present application;

[0045] Figure 7 A schematic diagram showing the control system of the embodiments of the present application.

[0046] Explanation of the reference numerals:

[0047] Control system 1; data acquisition module 10; basic regulation amount processing module 20; closed-loop regulation amount processing module 30; balanced regulation amount processing module 40. Specific implementation manners

[0048] Now, the example embodiments will be described more comprehensively with reference to the drawings. However, the example embodiments can be implemented in various forms and should not be construed as limited to the embodiments described herein; on the contrary, these embodiments are provided so that the present application will be comprehensive and complete, and the concept of the example embodiments will be fully conveyed to those skilled in the art. The same reference numerals in the figures represent the same or similar parts, and thus their repeated description will be omitted.

[0049] The described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of the embodiments of the present disclosure. However, those skilled in the art will recognize that the technical solutions of the present disclosure may be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. may be employed. In such cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0050] Furthermore, the terms "comprising" and "having" and any variations thereof are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or device that includes a series of steps or units is not limited to the listed steps or units, but optionally further includes steps or units not listed, or optionally further includes other steps or units inherent to these processes, methods, products, or devices.

[0051] The terms "first", "second", etc. in the specification and claims of this application and the above-mentioned drawings are used to distinguish different objects, rather than to describe a specific order.

[0052] The technical solutions of this application will be clearly and completely described below in conjunction with the drawings in the embodiments of this application. Obviously, the described embodiments are part of the embodiments of this application, rather than all of them. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative efforts fall within the scope of protection of this application.

[0053] The inventors believe that the voltage level of the busbar at the voltage central point of the power system determines the power supply quality of the power system. After a voltage deviation occurs in the power system, it is necessary to quickly adjust the reactive power of the network-forming devices in each region to restore the voltage at the voltage central point. And it is also necessary to pay attention to the busbar voltage of the substation collecting the network-forming devices in each region and the balance of reactive power between the network-forming devices.

[0054] Based on this, this application provides a control method for the reactive power of multi-region network-forming devices. Figure 1 A flowchart showing the control method of the embodiment of this application is as Figure 1 shown, and this control method includes steps S100 - S500.

[0055] Exemplarily, this control method may be executed by a control system with computing capabilities.

[0056] According to an exemplary embodiment, in step S100, the control system acquires the busbar voltage data of the substations collecting the network-forming devices in multiple regions of the power system and the reactive power data of each network-forming device.

[0057] Figure 2 A schematic diagram showing the power system according to an embodiment of the present application. As Figure 2 shown, the power system includes multiple regions (such as Region 1, Region 2...), and grid-forming devices are configured in each region to stabilize the voltage within each region.

[0058] For example, the control system collects the bus voltage data of the collection stations of each grid-forming device. The bus voltage data of the collection stations refers to the voltage acquisition values on the main power supply lines through which each grid-forming device transmits electric energy.

[0059] The control system also collects the reactive power data of each grid-forming device. The reactive power data refers to the reactive power acquisition values of each grid-forming device.

[0060] In step S200, the control system obtains the bus voltage data of the voltage pivot points of the power system.

[0061] For example, the control system collects the bus voltage data of the voltage pivot points of the power system. As Figure 2 shown, the bus voltage of the voltage pivot point refers to the voltage at each side bus node (voltage pivot point bus) of the representative hub substation in the power system. The bus voltage data of the voltage pivot point refers to the voltage data at each side bus node.

[0062] In step S300, the control system determines the basic adjustment amount of each grid-forming device according to the reactive power data of each grid-forming device, so as to adjust the bus voltage of the collection stations of each grid-forming device according to the basic adjustment amount.

[0063] For example, the control system can adjust the bus voltage of the collection stations of each grid-forming device according to the basic adjustment amount.

[0064] Figure 3 Another flowchart showing the control method according to an embodiment of the present application.

[0065] Optionally, as Figure 3 shown, step S300 may further include steps S310 - S320.

[0066] In step S310, the control system determines the maximum reactive power data of each grid-forming device and the total reactive power data of all grid-forming devices in multiple regions according to the reactive power data of each grid-forming device.

[0067] In step S320, the control system determines the basic adjustment amount according to the maximum reactive power data and the total reactive power data.

[0068] For example, the control system determines the maximum reactive power data of the current network-forming device based on the reactive power data of each network-forming device, and the control system sums up the reactive power data of all network-forming devices in all regions to obtain the total reactive power data.

[0069] Optionally, the calculation formula for the basic adjustment amount determined by the control system based on the maximum reactive power data and the total reactive power data is:

[0070]

[0071] Q total is the total reactive power data, Q i is the reactive power data of the network-forming device in the i-th region, is the basic adjustment amount of the network-forming device in the i-th region, is the maximum reactive power of the network-forming device in the i-th region, and n is the number of regions in the multi-region.

[0072] For example, the control system can quickly calculate the basic adjustment amount through the sum of the maximum reactive power data of the network-forming devices in n regions, the maximum reactive power data of each network-forming device, and the total reactive power data.

[0073] In step S400, when the bus voltage data of the voltage central point satisfies the first preset condition, the control system determines the closed-loop adjustment amount based on the bus voltage data and reactive power data of the substation, so as to adjust the bus voltage of the voltage central point according to the closed-loop adjustment amount.

[0074] For example, the first preset condition can be that the bus voltage data of the voltage central point is not within the preset range. When it is determined that the bus voltage data of the voltage central point is not within the preset range, the control system determines the closed-loop adjustment amount based on the bus voltage data and reactive power data of the substation, and adjusts the bus voltage of the voltage central point according to the closed-loop adjustment amount.

[0075] Figure 4 The schematic diagram of the adjustment of the bus voltage of the voltage central point according to the embodiment of the present application is shown. Figure 4 The adjustment waveform of the bus voltage of the voltage central point is shown. As Figure 4 shown, after a disturbance occurs, after adjusting the bus voltage of the voltage central point according to the closed-loop adjustment amount, the bus voltage of the voltage central point can be quickly adjusted to normal within 300 ms (such as Figure 4 shown as 0.5 s - 0.8 s in

[0076] Optionally, the first preset condition can be:

[0077] U t >U set +ΔU

[0078] U t <U set -ΔU

[0079] U t is the bus voltage data of the voltage central point, and U set is the preset value of the bus voltage of the voltage central point, and ΔU is the preset value of voltage over-limit.

[0080] For example, when the bus voltage data of the voltage central point is greater than the sum of the preset value of the bus voltage of the voltage central point and the preset value of voltage over-limit, or when the bus voltage data of the voltage central point is less than the difference between the preset value of the bus voltage of the voltage central point and the preset value of voltage over-limit, the control system determines that the bus voltage data of the voltage central point is not within the preset range.

[0081] Figure 5 Another flowchart showing the control method of the embodiment of the present application is shown.

[0082] Optionally, as Figure 5 shown, step S400 may further include steps S410 - S420.

[0083] In step S410, the control system determines the voltage increase coefficient and the voltage decrease coefficient according to the bus voltage data and the reactive power data of the substation.

[0084] For example, when there is a deviation in the bus voltage of the voltage central point, the control system determines the closed-loop adjustment amount through the voltage increase coefficient to increase the bus voltage of the voltage central point, or determines the closed-loop adjustment amount through the voltage decrease coefficient to decrease the bus voltage of the voltage central point. With such a setting, the deviation of the bus voltage of the voltage central point can be controlled by closed-loop adjustment.

[0085] Optionally, the calculation formula of the voltage increase coefficient is:

[0086]

[0087] m i is the voltage increase coefficient of the network-forming equipment in the i-th area, K qv.i is the reactive power-voltage coefficient of the network-forming equipment in the i-th area, U i is the bus voltage data of the network-forming equipment in the i-th area, U high is the high value of the bus voltage data, U max is the maximum value of the bus voltage data, Q max is the maximum reactive power of the network-forming equipment in the i-th area, Q i is the reactive power of the network-forming equipment in the i-th area, K set is the margin coefficient.

[0088] Optionally, the calculation formula for the voltage reduction coefficient is:

[0089]

[0090] n i is the voltage reduction coefficient of the network-forming equipment in the i-th area, and K qv.i is the reactive power-voltage coefficient of the network-forming equipment in the i-th area, and U low is the lower value of the bus voltage data of the collection station, and U i is the bus voltage data of the collection station of the network-forming equipment in the i-th area, and U min is the minimum value of the bus voltage data of the collection station, and Q max is the maximum reactive power of the network-forming equipment in the i-th area, and Q i is the reactive power of the network-forming equipment in the i-th area, and K set is the margin coefficient.

[0091] In step S420, the control system determines the closed-loop adjustment amount according to the voltage increase coefficient or the voltage reduction coefficient.

[0092] Optionally, the calculation formula for the control system to determine the closed-loop adjustment amount according to the voltage increase coefficient or the voltage reduction coefficient is:

[0093]

[0094] is the closed-loop adjustment amount of the network-forming equipment in the i-th area, is the closed-loop adjustment amount of the network-forming equipment in the previous control cycle in the i-th area, and U set is the preset value of the bus voltage of the voltage central point, and U t is the bus voltage data of the voltage central point, and Δε is the voltage adjustment dead zone.

[0095] For example, when the bus voltage data of the voltage central point is greater than a certain preset threshold (such as greater than the sum of the preset value of the bus voltage of the voltage central point and the voltage adjustment dead zone), the control system calculates the closed-loop adjustment amount according to the voltage increase coefficient and the closed-loop adjustment amount of the network-forming equipment in the previous control cycle. And when the bus voltage data of the voltage central point is less than a certain preset threshold (such as less than the difference between the preset value of the bus voltage of the voltage central point and the voltage adjustment dead zone), the control system calculates the closed-loop adjustment amount according to the voltage reduction coefficient and the closed-loop adjustment amount of the network-forming equipment in the previous control cycle.

[0096] In step S500, when the bus voltage data of the voltage central point and the reactive power data of any one of the network-forming equipment satisfy the second preset condition, the control system determines the balance adjustment amount according to the basic adjustment amount and the reactive power data, so as to adjust the reactive power of each network-forming equipment according to the balance adjustment amount.

[0097] For example, the second preset condition may be that the bus voltage data of the voltage central point is within a preset range, and when the reactive power data of any one grid-forming device is not within the preset range, the control system determines the equalizing adjustment amount according to the basic adjustment amount and the reactive power data. And the control system adjusts the reactive power of each grid-forming device according to the equalizing adjustment amount to balance the reactive power among the grid-forming devices.

[0098] Optionally, the second preset condition is:

[0099] The bus voltage data of the voltage central point satisfies the following formula:

[0100] U set -k set ΔU < U t < U set +k set ΔU(1)

[0101] And, the reactive power data of any one grid-forming device does not satisfy the following formula:

[0102]

[0103] U set is the preset value of the bus voltage of the voltage central point, K set is the margin coefficient, ΔU is the preset value of voltage over-limit, U t is the bus voltage data of the voltage central point, is the basic adjustment amount of the grid-forming device in the i-th area, ΔQ is the preset value of reactive power balance, Q i is the reactive power of the grid-forming device in the i-th area.

[0104] For example, when the bus voltage data of the voltage central point and the reactive power data of the grid-forming device simultaneously satisfy formulas (1) and (2), the control system calculates the equalizing adjustment amount.

[0105] Optionally, the calculation formula of the equalizing adjustment amount is:

[0106]

[0107] is the equalizing adjustment amount of the grid-forming device in the i-th area, k p is the proportionality coefficient, k i is the integral coefficient, S is a complex variable, is the basic adjustment amount of the grid-forming device in the i-th area, Q i is the reactive power of the grid-forming device in the i-th area.

[0108] Figure 6The schematic diagram of regulating the reactive power of the network-forming device according to the embodiment of the present application is shown.

[0109] For example, as Figure 6 shown, when the bus voltage data of the voltage central point is within the normal range, the reactive power of the network-forming device can be quickly regulated to balance the reactive power among the network-forming devices.

[0110] Through the above exemplary embodiments, the present application respectively calculates the basic regulation amount, the closed-loop regulation amount, and the balance regulation amount based on the collected bus voltage data of the collection stations of each network-forming device, the reactive power data of each network-forming device, and the bus voltage data of the voltage central point, so as to regulate the bus voltage of the collection stations of each network-forming device according to the basic regulation amount, regulate the bus voltage of the voltage central point according to the closed-loop regulation amount, and regulate the reactive power of each network-forming device according to the balance regulation amount.

[0111] By regulating and controlling the reactive power of each network-forming device, the present application can quickly regulate the bus voltage of the voltage central point, thereby improving the voltage regulation speed after a disturbance occurs. The present application also controls the deviation of the bus voltage of the voltage central point through closed-loop control, which can improve the power supply quality of the power system, and by balancing the reactive power among the network-forming devices, the support ability of the transient voltage of the power system can be enhanced, thereby improving the support strength of the new energy power system.

[0112] According to another aspect of the present application, the present application provides a control system for the reactive power of multi-region network-forming devices. Figure 7 The schematic diagram of the control system according to the embodiment of the present application is shown, as Figure 7 shown, the control system 1 includes a data acquisition module 10, a basic regulation amount processing module 20, a closed-loop regulation amount processing module 30, and a balance regulation amount processing module 40.

[0113] According to the exemplary embodiment, the data acquisition module 10 acquires the bus voltage data of the collection stations of each network-forming device in multiple regions of the power system and the reactive power data of each network-forming device.

[0114] For example, the data acquisition module 10 collects the bus voltage data of the collection stations of each network-forming device, and the bus voltage data of the collection stations refers to the voltage acquisition value on the main power supply line for each network-forming device to transmit electric energy.

[0115] The data acquisition module 10 also collects the reactive power data of each network-forming device, and the reactive power data refers to the reactive power acquisition value of each network-forming device.

[0116] The data acquisition module 10 acquires the bus voltage data of the voltage central point of the power system.

[0117] For example, the data acquisition module 10 collects the bus voltage data of the voltage central point of the power system. The bus voltage of the voltage central point refers to the voltage at each side bus node of the representative hub substation in the power system (the bus of the voltage central point). The bus voltage data of the voltage central point refers to the voltage data at each side bus node.

[0118] The basic regulation amount processing module 20 determines the basic regulation amount of each network-forming device according to the reactive power data of each network-forming device, so as to adjust the bus voltage of the collection station of each network-forming device according to the basic regulation amount.

[0119] For example, the basic regulation amount processing module 20 can adjust the bus voltage of the collection station of each network-forming device according to the basic regulation amount.

[0120] Optionally, the basic regulation amount processing module 20 determines the maximum reactive power data of each network-forming device and the total reactive power data of all network-forming devices in multiple regions according to the reactive power data of each network-forming device.

[0121] The basic regulation amount processing module 20 determines the basic regulation amount according to the maximum reactive power data and the total reactive power data.

[0122] For example, the basic regulation amount processing module 20 determines the maximum reactive power data of the current network-forming device according to the reactive power data of each network-forming device, and the basic regulation amount processing module 20 sums up the reactive power data of all network-forming devices in all regions to obtain the total reactive power data.

[0123] Optionally, the formula for the basic regulation amount processing module 20 to determine the basic regulation amount according to the maximum reactive power data and the total reactive power data is:

[0124]

[0125] Q total is the total reactive power data, Q i is the reactive power data of the network-forming device in the i-th region, is the basic regulation amount of the network-forming device in the i-th region, is the maximum reactive power of the network-forming device in the i-th region, and n is the number of regions in multiple regions.

[0126] For example, the basic regulation amount processing module 20 can quickly calculate the basic regulation amount through the sum of the maximum reactive power data of the network-forming devices in n regions, the maximum reactive power data of each network-forming device, and the total reactive power data.

[0127] According to an exemplary embodiment, when the bus voltage data of the voltage central point satisfies a first preset condition, the closed-loop regulation amount processing module 30 determines a closed-loop regulation amount based on the bus voltage data and reactive power data of the collecting station, so as to adjust the bus voltage of the voltage central point according to the closed-loop regulation amount.

[0128] For example, the first preset condition may be that the bus voltage data of the voltage central point is not within a preset range. When it is determined that the bus voltage data of the voltage central point is not within the preset range, the closed-loop regulation amount processing module 30 determines a closed-loop regulation amount based on the bus voltage data and reactive power data of the collecting station, and adjusts the bus voltage of the voltage central point according to the closed-loop regulation amount.

[0129] Optionally, the first preset condition may be:

[0130] U t >U set +ΔU

[0131] U t <U set -ΔU

[0132] U t is the bus voltage data of the voltage central point, U set is the preset value of the bus voltage of the voltage central point, and ΔU is the preset value of voltage over-limit.

[0133] For example, when the bus voltage data of the voltage central point is greater than the sum of the preset value of the bus voltage of the voltage central point and the preset value of voltage over-limit, or when the bus voltage data of the voltage central point is less than the difference between the preset value of the bus voltage of the voltage central point and the preset value of voltage over-limit, the closed-loop regulation amount processing module 30 determines that the bus voltage data of the voltage central point is not within the preset range.

[0134] Optionally, the closed-loop regulation amount processing module 30 determines a voltage increase coefficient and a voltage decrease coefficient based on the bus voltage data and reactive power data of the collecting station.

[0135] For example, when there is a deviation in the bus voltage of the voltage central point, the closed-loop regulation amount processing module 30 increases the bus voltage of the voltage central point by the closed-loop regulation amount determined by the voltage increase coefficient, or decreases the bus voltage of the voltage central point by the closed-loop regulation amount determined by the voltage decrease coefficient. Such a setting can achieve closed-loop regulation to control the deviation of the bus voltage of the voltage central point.

[0136] Optionally, the calculation formula of the voltage increase coefficient is:

[0137]

[0138] m i is the voltage increase coefficient of the network-forming equipment in the i-th area, K qv.iis the reactive voltage coefficient of the network-forming equipment in the i-th area, U i is the substation bus voltage data of the network-forming equipment in the i-th area, U high is the high value of the substation bus voltage data, U max is the maximum value of the substation bus voltage data, Q max is the maximum reactive power of the network-forming equipment in the i-th area, Q i is the reactive power of the network-forming equipment in the i-th area, K set is the margin coefficient.

[0139] Optionally, the calculation formula for the voltage reduction coefficient is:

[0140]

[0141] n i is the voltage reduction coefficient of the network-forming equipment in the i-th area, K qv.i is the reactive voltage coefficient of the network-forming equipment in the i-th area, U low is the low value of the substation bus voltage data, U i is the substation bus voltage data of the network-forming equipment in the i-th area, U min is the minimum value of the substation bus voltage data, Q max is the maximum reactive power of the network-forming equipment in the i-th area, Q i is the reactive power of the network-forming equipment in the i-th area, K set is the margin coefficient.

[0142] Optionally, the calculation formula for the closed-loop regulation amount determined by the closed-loop regulation amount processing module 30 according to the voltage increase coefficient or the voltage reduction coefficient is:

[0143]

[0144] is the closed-loop regulation amount of the network-forming equipment in the i-th area, is the closed-loop regulation amount of the network-forming equipment in the i-th area in the previous control cycle, U set is the preset value of the bus voltage of the voltage central point, U t is the bus voltage data of the voltage central point, and Δε is the voltage regulation dead zone.

[0145] For example, when the bus voltage data of the voltage central point is greater than a certain preset threshold (e.g., greater than the sum of the preset value of the bus voltage of the voltage central point and the voltage regulation dead zone), the closed-loop regulation amount processing module 30 calculates the closed-loop regulation amount according to the voltage increase coefficient and the closed-loop regulation amount of the network-forming device in the previous control cycle. Also, when the bus voltage data of the voltage central point is less than a certain preset threshold (e.g., less than the difference between the preset value of the bus voltage of the voltage central point and the voltage regulation dead zone), the closed-loop regulation amount processing module 30 calculates the closed-loop regulation amount according to the voltage decrease coefficient and the closed-loop regulation amount of the network-forming device in the previous control cycle.

[0146] According to the exemplary embodiment, when the bus voltage data of the voltage central point and the reactive power data of any one network-forming device satisfy the second preset condition, the balance regulation amount processing module 40 determines the balance regulation amount according to the basic regulation amount and the reactive power data, so as to regulate the reactive power of each network-forming device according to the balance regulation amount.

[0147] For example, the second preset condition may be that when the bus voltage data of the voltage central point is within a preset range and the reactive power data of any one network-forming device is not within the preset range, the balance regulation amount processing module 40 determines the balance regulation amount according to the basic regulation amount and the reactive power data. And the balance regulation amount processing module 40 regulates the reactive power of each network-forming device according to the balance regulation amount to balance the reactive power between each network-forming device.

[0148] Optionally, the second preset condition is:

[0149] The bus voltage data of the voltage central point satisfies the following formula:

[0150] U set -k set ΔU < U t < U set +k set ΔU(1)

[0151] And the reactive power data of any one network-forming device does not satisfy the following formula:

[0152]

[0153] U set is the preset value of the bus voltage of the voltage central point, K set is the margin coefficient, ΔU is the preset value of voltage over-limit, U t is the bus voltage data of the voltage central point, is the basic regulation amount of the network-forming device in the i-th area, ΔQ is the preset value of reactive power balance, Q i is the reactive power of the network-forming device in the i-th area.

[0154] For example, when the bus voltage data of the voltage central point and the reactive power data of the network-forming devices simultaneously satisfy Formulas (1) and (2), the control system calculates the equalizing adjustment amount.

[0155] Optionally, the calculation formula for the equalizing adjustment amount is:

[0156]

[0157] is the equalizing adjustment amount of the network-forming device in the i-th area, k p is the proportionality coefficient, k i is the integral coefficient, S is a complex variable, is the basic adjustment amount of the network-forming device in the i-th area, Q i is the reactive power of the network-forming device in the i-th area.

[0158] Through the above exemplary embodiments, the present application calculates the basic adjustment amount, the closed-loop adjustment amount, and the equalizing adjustment amount respectively from the collected bus voltage data of the collection stations of each network-forming device, the reactive power data of each network-forming device, and the bus voltage data of the voltage central point, so as to adjust the bus voltage of the collection stations of each network-forming device according to the basic adjustment amount, adjust the bus voltage of the voltage central point according to the closed-loop adjustment amount, and adjust the reactive power of each network-forming device according to the equalizing adjustment amount.

[0159] By adjusting and controlling the reactive power of each network-forming device, the present application can quickly adjust the bus voltage of the voltage central point, thereby improving the voltage regulation speed after a disturbance occurs. The present application also closes the loop to control the deviation of the bus voltage of the voltage central point, which can improve the power supply quality of the power system, and by equalizing the reactive power among each network-forming device, the support ability of the transient voltage of the power system can be enhanced, thereby improving the support strength of the new energy power system.

[0160] According to another aspect of the present application, the present application also provides an electronic device. The electronic device includes: one or more processors; a storage device for storing one or more programs, and when the one or more programs are executed by the one or more processors, the one or more processors can implement the control method as described above.

[0161] According to another aspect of the present application, the present application also provides a non-volatile computer-readable storage medium. A computer program is stored on the storage medium, and when the computer program is executed by a processor, it can implement the control method as described above.

[0162] Finally, it should be noted that the above are only the preferred embodiments of the present application and are not used to limit the present application. Although the present application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or perform equivalent replacements for some of the technical features. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present application shall be included within the protection scope of the present application.

Claims

1. A method for controlling reactive power of multi-area network equipment, characterized in that: include: Acquire the bus voltage data of the collection station of each grid-forming device in multiple areas of the power system and the reactive power data of each grid-forming device; Obtain bus voltage data at the voltage center point of the power system; Determine the basic regulation amount of each of the grid-forming devices according to the reactive power data of each of the grid-forming devices, so as to adjust the bus voltage of the collection station of each of the grid-forming devices according to the basic regulation amount; When the voltage data of the busbar voltage at the voltage pivot point meets the first preset condition, a closed-loop regulation amount is determined according to the busbar voltage data of the collection station and the reactive power data, so as to regulate the voltage of the busbar voltage at the voltage pivot point according to the closed-loop regulation amount; In the case where the voltage data of the busbar at the voltage hub point and the reactive power data of any one of the grid-forming devices meet the second preset condition, a balanced adjustment amount is determined according to the basic adjustment amount and the reactive power data, so as to adjust the reactive power of each of the grid-forming devices according to the balanced adjustment amount; Determining the closed-loop regulation amount according to the collection station bus voltage data and the reactive power data comprises: Determine a voltage increase coefficient and a voltage decrease coefficient according to the bus voltage data of the collection station and the reactive power data; Determining the closed-loop adjustment amount according to the voltage up-regulation coefficient or the voltage down-regulation coefficient; The calculation formula of the voltage increase coefficient is: Among them, m i is the voltage increase coefficient of the grid-forming equipment in the ith area, K qv.i is the reactive voltage coefficient of the grid-connected equipment in the ith area, U i is the bus voltage data of the collection station of the grid-forming equipment in the ith area, U high is the high value of the bus voltage data of the collection station, U max is the maximum value of the bus voltage data of the collection station, Q max is the maximum reactive power of the grid-connected equipment in the ith region, Q i is the reactive power of the grid-connected equipment in the ith area, K set is the margin factor; The calculation formula of the voltage reduction coefficient is: Among them, n i is the voltage reduction coefficient of the grid-forming equipment in the ith area, K qv.i is the reactive voltage coefficient of the grid-connected equipment in the ith area, U low is the lower value of the bus voltage data of the collection station, U i is the bus voltage data of the collection station of the grid-forming equipment in the ith area, U min is the minimum value of the bus voltage data of the collection station, Q max is the maximum reactive power of the grid-connected equipment in the ith region, Q i is the reactive power of the grid-connected equipment in the ith area, K set is the margin factor.

2. The control method according to claim 1, characterized in that: Determining the basic adjustment amount of each meshing device according to the reactive power data of each meshing device includes: Determine the maximum reactive power data of each meshing device and the total reactive power data of all meshing devices in the multiple regions according to the reactive power data of each meshing device; The basic adjustment amount is determined according to the maximum reactive power data and the total reactive power data.

3. The control method according to claim 2, characterized in that: The calculation formula for determining the basic adjustment amount according to the maximum reactive power data and the total reactive power data is: Among them, Q total is the total reactive power data, Q i is the reactive power data of the grid-connected equipment in the ith area, is the basic adjustment amount of the network-building equipment in the ith area, is the maximum reactive power of the grid-forming device in the ith area, and n is the number of areas in the multiple areas.

4. The control method according to claim 1, characterized in that: The first preset condition is: U t >U set +ΔU U t <U set -ΔU Among them, U t is the voltage data of the voltage center point busbar, U set is the preset value of the bus voltage at the voltage center point, and ΔU is the preset value of the voltage over-limit.

5. The control method according to claim 1, characterized in that: The calculation formula for determining the closed-loop adjustment amount according to the voltage increase coefficient or the voltage decrease coefficient is: in, is the closed-loop regulation value of the network-building equipment in the ith area, is the closed-loop regulation value of the previous control cycle of the networked device in the ith region, U set is the preset value of the bus voltage at the voltage center point, U t is the bus voltage data of the voltage central point, and Δε is the voltage regulation dead zone.

6. The control method according to claim 1, characterized in that: The second preset condition is: The voltage data of the voltage center busbar satisfies the following formula: U set -k set ΔU<U t <U set +k set ΔU And, the reactive power data of any of the grid-forming devices does not satisfy the following formula: Among them, U set K is the preset value of the voltage center bus voltage, set is the margin coefficient, ΔU is the voltage over-limit preset value, U t is the bus voltage data of the voltage center point, is the basic regulation amount of the grid-forming equipment in the ith area, ΔQ is the preset value of reactive power balance, Q i is the reactive power of the grid-connected equipment in the ith area; The calculation formula of the balance adjustment amount is: in, is the balanced adjustment amount of the network-building equipment in the ith area, k p is the proportionality coefficient, k i is the integral coefficient, S is a complex variable, is the basic adjustment amount of the network-type equipment in the ith area, Q i is the reactive power of the grid-connected equipment in the ith area.

7. A control system for reactive power of multi-area networked equipment, characterized in that: The control system is used to execute the control method according to any one of claims 1 to 6, and the control includes: A data acquisition module is used to acquire the bus voltage data of the collection station of each grid-forming device in multiple areas of the power system and the reactive power data of each grid-forming device; and to acquire the bus voltage data of the voltage center point of the power system; A basic regulation amount processing module is used to determine the basic regulation amount of each of the grid-forming devices according to the reactive power data of each of the grid-forming devices, so as to adjust the bus voltage of the collection station of each of the grid-forming devices according to the basic regulation amount; A closed-loop regulation amount processing module, when the voltage pivot point bus voltage data satisfies a first preset condition, determines a closed-loop regulation amount according to the collection station bus voltage data and the reactive power data, so as to adjust the voltage pivot point bus voltage according to the closed-loop regulation amount; The balancing adjustment quantity processing module determines the balancing adjustment quantity based on the basic adjustment quantity and the reactive power data when the bus voltage data of the voltage central point and the reactive power data of any meshing type device meet the second preset condition, so as to adjust the reactive power of each meshing type device according to the balancing adjustment quantity.

8. An electronic device, characterized in that: include: one or more processors; A storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the control method as described in any one of claims 1-6.

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

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