Control method and system for reactive powers of grid-forming devices in multiple areas, and electronic device and storage medium

Abstract

Provided in the present application are a control method and system for reactive powers of grid-forming devices in multiple areas, and an electronic device and a storage medium. The control method comprises: acquiring collector station bus voltage data of grid-forming devices in multiple areas of a power system and reactive power data of the grid-forming devices; acquiring voltage pilot point bus voltage data of the power system; on the basis of the reactive power data of the grid-forming devices, determining a basic regulation amount for each grid-forming device, so as to regulate the collector station bus voltage of each grid-forming device on the basis of the basic regulation amount; when the voltage pilot point bus voltage data satisfies a first preset condition, determining a closed-loop regulation amount on the basis of the collector station bus voltage data and the reactive power data, so as to regulate a voltage pilot point bus voltage on the basis of the closed-loop regulation amount; and when the voltage pilot point bus voltage data and reactive power data of any grid-forming device satisfy a second preset condition, determining a balance regulation amount on the basis of the basic regulation amount and the reactive power data, so as to regulate the reactive power of each grid-forming device on the basis of the balance regulation amount.

Description

Method and system for controlling reactive power of multi-region meshing equipment, electronic device and storage medium TECHNICAL FIELD

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

[0002] A high-proportion new energy power system refers to a power system in which a large amount of renewable energy such as wind energy and solar energy is connected and utilized to achieve clean and low-carbon power supply. The high-proportion new energy power system mainly provides voltage support through meshing equipment, and for a large-capacity system, meshing equipment needs to be configured in each region to stabilize the voltage in each region.

[0003] Due to the connection of high-proportion new energy, source-load double fluctuations will cause the voltage of the power system to fluctuate frequently and greatly, and the meshing equipment will generally adopt voltage reactive droop characteristics to respond autonomously to maintain the voltage in the region, which will cause the bus voltage of the power system to deviate. In addition, the power supply difference between each region in the power system can also cause the reactive power between each meshing equipment to differ too much, and when a disturbance occurs, some meshing equipment will be overloaded in advance, thereby weakening its voltage support capability. The instability of the bus voltage and the change of the reactive power will seriously affect the voltage stability of the power system.

[0004] At present, the bus voltage and the reactive power of each meshing equipment are generally controlled by an AVC (Automatic Voltage Control) controller. However, the inventors have found that on the one hand, the conventional AVC controller is based on server or workstation hardware for corresponding control, which cannot directly collect voltage information and reactive power information, and needs to obtain voltage information and reactive power information from independent measurement and control devices based on communication, which has the problems of slow voltage tracking response and poor accuracy; on the other hand, the communication between the conventional AVC controller and each control device needs to pass through a communication management mechanism for protocol conversion, which has the problems of 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 the high-proportion new energy power system.

[0005] In addition, the current reactive power coordination control method of meshing equipment aims to focus on the voltage control of meshing equipment on the same bus and the reactive power balance between the converters, which is not suitable for the coordination control between multi-region meshing equipment in a large-capacity scenario. SUMMARY

[0006] According to an aspect of the present application, the present application provides a method for controlling reactive power of a multi-region network-forming device, the method comprising: obtaining bus voltage data of a collection station of each network-forming device in a multi-region power system and reactive power data of each network-forming device; obtaining bus voltage data of a voltage center point of the power system; determining a 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; in a case where the bus voltage data of the voltage center point satisfies a first preset condition, determining a 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 center point according to the closed-loop adjustment amount; and in a case where the bus voltage data of the voltage center point and the reactive power data of any one of the network-forming devices satisfy a second preset condition, determining an equalization 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 equalization adjustment amount.

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

[0010] According to some embodiments of the present application, the first preset condition is: t U set + ΔU t U set - ΔU

[0011] wherein, U t is the bus voltage data of the voltage center point, and U setThe voltage central point bus voltage preset value is ΔU, and the voltage out-of-limit preset value is ΔU; the closed-loop adjustment amount is determined according to the bus voltage data and the reactive power data of the collection station, including: determining the voltage up-regulation coefficient and the voltage down-regulation coefficient according to the bus voltage data and the reactive power data of the collection station; and determining the closed-loop adjustment amount according to the voltage up-regulation coefficient or the voltage down-regulation coefficient.

[0012] According to some embodiments of the present application, the calculation formula of the voltage up-regulation coefficient is:

[0013] Wherein, m i is the voltage up-regulation coefficient of the network-forming equipment in the i th region, K qv.i is the reactive voltage coefficient of the network-forming equipment in the i th region, U i is the bus voltage data of the network-forming equipment in the i th region, 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 network-forming equipment in the i th region, Q i is the reactive power of the network-forming equipment in the i th region, K set is the margin coefficient.

[0014] According to some embodiments of the present application, the calculation formula of the voltage down-regulation coefficient is:

[0015] Wherein, n i is the voltage down-regulation coefficient of the network-forming equipment in the i th region, K qv.i is the reactive voltage coefficient of the network-forming equipment in the i th region, U low is the low value of the bus voltage data of the collection station, U i is the bus voltage data of the network-forming equipment in the i th region, 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 region, Q i is the reactive power of the network-forming equipment in the i th region, K set is the margin coefficient.

[0016] According to some embodiments of the present application, the calculation formula of the closed-loop adjustment amount determined according to the voltage up-regulation coefficient or the voltage down-regulation coefficient is:

[0017] Wherein, is the closed-loop adjustment amount of the network-forming equipment in the i th region, is the closed-loop adjustment amount of the network-forming equipment in the i th region in the previous control period, U setU is the preset value of the bus voltage at the voltage center point. t The voltage data is the bus voltage at the voltage center point, and Δε is the voltage regulation dead zone.

[0018] According to some embodiments of this application, the second preset condition is: the voltage data of the bus at the voltage center point satisfies the following formula: U set -k set ΔU<U t <U set +k set ΔU

[0019] Furthermore, the reactive power data of any network-type device does not satisfy the following formula:

[0020] Among them, U set K is the preset value of the bus voltage at the voltage center point. set U is the margin factor, ΔU is the preset value for voltage over-limit, and U t This refers to the bus voltage data at the voltage center point. Let Q be the basic adjustment value of the grid-type equipment in the i-th region, and let ΔQ be the preset value for reactive power balancing. i Let be the reactive power of the network-type equipment in the i-th region;

[0021] The formula for calculating the balance adjustment amount is:

[0022] in, k represents the equalization adjustment amount of the network-type equipment in the i-th region. p k is the proportionality coefficient. i Let S be the integral coefficient, and S be a complex variable. Q represents the basic adjustment value of the network-type equipment in the i-th region. i Let be the reactive power of the network-type equipment in the i-th region.

[0023] According to another aspect of the present application, the present application provides a multi-region networked device reactive power control system, which comprises a data acquisition module, a basic regulation quantity processing module, a closed-loop regulation quantity processing module and a balance regulation quantity processing module. The data acquisition module acquires the bus voltage data of the collection station of each networked device in the multi-region power system and the reactive power data of each networked device; and acquires the voltage hub bus voltage data of the power system. The basic regulation quantity processing module determines the basic regulation quantity of each networked device according to the reactive power data of each networked device, so as to adjust the bus voltage of the collection station of each networked device according to the basic regulation quantity. The closed-loop regulation quantity processing module determines the closed-loop regulation quantity according to the bus voltage data and the reactive power data under the condition that the voltage hub bus voltage data satisfies a first preset condition, so as to adjust the voltage hub bus voltage according to the closed-loop regulation quantity. The balance regulation quantity processing module determines the balance regulation quantity according to the basic regulation quantity and the reactive power data under the condition that the voltage hub bus voltage data and the reactive power data of any one networked device satisfy a second preset condition, so as to adjust the reactive power of each networked device according to the balance regulation quantity.

[0024] According to still another aspect of the present application, the present application further provides an electronic device. The electronic device comprises 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.

[0025] According to still another aspect of the present application, the present application further provides a non-volatile computer readable storage medium. The storage medium stores a computer program, which, when executed by a processor, can implement the control method as described above.

[0026] The present application calculates the basic regulation quantity, the closed-loop regulation quantity and the balance regulation quantity respectively by the acquired bus voltage data of the collection station of each networked device, the reactive power data of each networked device and the voltage hub bus voltage data, so as to adjust the bus voltage of the collection station of each networked device according to the basic regulation quantity, adjust the voltage hub bus voltage according to the closed-loop regulation quantity, and adjust the reactive power of each networked device according to the balance regulation quantity.

[0027] The present application can quickly adjust the voltage hub bus voltage through the adjustment and control of the reactive power of each networked device, so as to improve the voltage adjustment speed after disturbance. The present application can improve the power supply quality of the power system through the closed-loop control of the deviation of the voltage hub bus voltage, and can enhance the support capability of the transient voltage of the power system through the balance adjustment of the reactive power between each networked device, so as to improve the support strength of the new energy power system. BRIEF DESCRIPTION OF DRAWINGS

[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present application, the drawings needed to be used in the embodiments will be briefly introduced. Obviously, the drawings in the following description only constitute some embodiments of the present application, and for those skilled in the art, other drawings can be obtained without creative labor.

[0029] Fig. 1 shows a flowchart of the control method of the embodiments of the present application;

[0030] Fig. 2 shows a schematic diagram of the power system of the embodiments of the present application;

[0031] Fig. 3 shows another flowchart of the control method of the embodiments of the present application;

[0032] Fig. 4 shows a schematic diagram of the adjustment of the voltage center point bus voltage of the embodiments of the present application;

[0033] Fig. 5 shows another flowchart of the control method of the embodiments of the present application;

[0034] Fig. 6 shows a schematic diagram of the adjustment of the reactive power of the grid- forming equipment of the embodiments of the present application;

[0035] Fig. 7 shows a schematic diagram of the control system of the embodiments of the present application.

[0036] Legend: control system 1; data acquisition module 10; basic adjustment amount processing module 20; closed-loop adjustment amount processing module 30; balanced adjustment amount processing module 40. DETAILED DESCRIPTION

[0037] The technical solutions of the present application will be described clearly and completely in combination with the drawings in the embodiments of the present application. Obviously, the described embodiments are only some of the embodiments of the present application, not all. Based on the embodiments in the present application, all other embodiments obtained by those skilled in the art without creative labor are within the scope of protection of the present application.

[0038] The inventor believes that the voltage level of the voltage center point bus of the power system determines the power supply quality of the power system. After the voltage deviation of the power system occurs, the reactive power of the grid-forming equipment in each region needs to be adjusted quickly to restore the voltage of the voltage center point. In addition, the bus voltage of the collection station of each grid-forming equipment and the balance of the reactive power between each grid-forming equipment also need to be concerned.

[0039] Based on this, the present application provides a control method of the reactive power of multi-region grid-forming equipment. Fig. 1 shows a flowchart of the control method of the embodiments of the present application. As shown in Fig. 1, the control method comprises steps S100-S500.

[0040] Exemplarily, the control method can be executed by a control system with computing capability.

[0041] According to an example embodiment, in step S100, the control system acquires the busbar voltage data of each grid-forming device in the power system and the reactive power data of each grid-forming device.

[0042] FIG. 2 shows a schematic diagram of a power system according to an embodiment of the present application. As shown in FIG. 2, the power system includes a plurality of regions (e.g., region 1, region 2,...), and each region is configured with a grid-forming device to stabilize the voltage in each region.

[0043] For example, the control system collects the busbar voltage data of each grid-forming device, which refers to the voltage collection value on the main power supply line of each grid-forming device.

[0044] The control system also collects the reactive power data of each grid-forming device, which refers to the reactive power collection value of each grid-forming device.

[0045] In step S200, the control system acquires the voltage hub busbar voltage data of the power system.

[0046] For example, the control system collects the voltage hub busbar voltage data of the power system. As shown in FIG. 2, the voltage hub busbar voltage refers to the voltage at each side busbar node (voltage hub busbar) of a representative hub substation in the power system. The voltage hub busbar voltage data refers to the voltage data at each side busbar node.

[0047] 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, to adjust the busbar voltage of each grid-forming device according to the basic adjustment amount.

[0048] For example, the control system can adjust the busbar voltage of each grid-forming device according to the basic adjustment amount.

[0049] FIG. 3 shows another flowchart of a control method according to an embodiment of the present application.

[0050] Optionally, as shown in FIG. 3, step S300 can further include steps S310-S320.

[0051] 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 the multi-region according to the reactive power data of each grid-forming device.

[0052] In step S320, the control system determines the basic adjustment amount according to the maximum reactive power data and the total reactive power data.

[0053] For example, the control system determines the maximum reactive power data of the current grid-forming device according to the reactive power data of each grid-forming device, and the control system sums the reactive power data of all grid-forming devices in all regions to obtain the total reactive power data.

[0054] Optionally, the calculation formula of the basic adjustment amount determined by the control system according to the maximum reactive power data and the total reactive power data is:

[0055] Q total is the total reactive power data, Q i is the reactive power data of the grid-forming device in the i-th region, is the basic adjustment amount of the grid-forming device in the i-th region, is the maximum reactive power of the grid-forming device in the i-th region, and n is the number of regions in the multi-region.

[0056] For example, the control system can quickly calculate the basic adjustment amount through the sum of the maximum reactive power data of the grid-forming devices in the n regions, the maximum reactive power data of each grid-forming device, and the total reactive power data.

[0057] In step S400, the control system determines the closed-loop adjustment amount according to the bus voltage data and the reactive power data of the collection station when the voltage hub point bus voltage data meets the first preset condition, so as to adjust the voltage hub point bus voltage according to the closed-loop adjustment amount.

[0058] For example, the first preset condition can be that the voltage hub point bus voltage data is not in the preset range. When it is determined that the voltage hub point bus voltage data is not in the preset range, the control system determines the closed-loop adjustment amount according to the bus voltage data and the reactive power data of the collection station, and adjusts the voltage hub point bus voltage according to the closed-loop adjustment amount.

[0059] FIG. 4 shows a schematic diagram of the adjustment of the voltage hub point bus voltage according to an embodiment of the present application. FIG. 4 shows the adjustment waveform of the voltage hub point bus voltage. As shown in FIG. 4, after the voltage hub point bus voltage is adjusted according to the closed-loop adjustment amount after the disturbance occurs, the voltage hub point bus voltage can be quickly adjusted to normal within 300 ms (0.5 s-0.8 s as shown in FIG. 4).

[0060] Optionally, the first preset condition can be: t U set +ΔU t U set -ΔU

[0061] U t is a voltage center point bus voltage data, U set is a voltage center point bus voltage preset value, and ΔU is a voltage out-of-limit preset value.

[0062] For example, when the voltage center point bus voltage data is greater than the sum of the voltage center point bus voltage preset value and the voltage out-of-limit preset value, or when the voltage center point bus voltage data is less than the difference between the voltage center point bus voltage preset value and the voltage out-of-limit preset value, the control system determines that the voltage center point bus voltage data is not within the preset range.

[0063] FIG. 5 shows another flowchart of the control method according to an embodiment of the present application.

[0064] Optionally, as shown in FIG. 5, the step S400 can further include steps S410-S420.

[0065] In step S410, the control system determines a voltage up-regulation coefficient and a voltage down-regulation coefficient according to the busbar voltage data and the reactive power data of the collection station.

[0066] For example, when the voltage center point bus voltage deviates, the control system determines a closed-loop adjustment amount through the voltage up-regulation coefficient to up-regulate the voltage center point bus voltage, or determines a closed-loop adjustment amount through the voltage down-regulation coefficient to down-regulate the voltage center point bus voltage, so that the deviation of the closed-loop adjustment control voltage center point bus voltage can be realized.

[0067] Optionally, the calculation formula of the voltage up-regulation coefficient is:

[0068] m i is a voltage up-regulation coefficient of the network-forming device of the i-th region, K qv.i is a reactive voltage coefficient of the network-forming device of the i-th region, U i is busbar voltage data of the network-forming device of the i-th region, U high is a high value of the busbar voltage data, U max is a maximum value of the busbar voltage data, Q max is a maximum reactive power of the network-forming device of the i-th region, Q i is a reactive power of the network-forming device of the i-th region, K set is a margin coefficient.

[0069] Optionally, the calculation formula of the voltage down-regulation coefficient is:

[0070] n i is a voltage down-regulation coefficient of the network-forming device of the i-th region, K qv.ia reactive voltage coefficient of the grid-forming device of the ith region, U low a low value of the bus voltage data of the collection station, U i a bus voltage data of the collection station of the grid-forming device of the ith region, U min a minimum value of the bus voltage data of the collection station, Q max a maximum reactive power of the grid-forming device of the ith region, Q i a reactive power of the grid-forming device of the ith region, K set a margin coefficient.

[0071] In step S420, the control system determines the closed-loop adjustment amount according to the voltage up-regulation coefficient or the voltage down-regulation coefficient.

[0072] Optionally, the calculation formula for the control system to determine the closed-loop adjustment amount according to the voltage up-regulation coefficient or the voltage down-regulation coefficient is:

[0073] a closed-loop adjustment amount of the grid-forming device of the ith region, a closed-loop adjustment amount of the grid-forming device of the ith region in the previous control period, U set a preset value of the voltage central point bus voltage, U t a voltage central point bus voltage data, Δε is a voltage adjustment dead zone.

[0074] For example, when the voltage central point bus voltage data is greater than a certain preset threshold (such as greater than the sum of the preset value of the voltage central point bus voltage and the voltage adjustment dead zone), the control system calculates the closed-loop adjustment amount according to the voltage up-regulation coefficient and the closed-loop adjustment amount of the grid-forming device in the previous control period. And when the voltage central point bus voltage data is less than a certain preset threshold (such as less than the difference between the preset value of the voltage central point bus voltage and the voltage adjustment dead zone), the control system calculates the closed-loop adjustment amount according to the voltage down-regulation coefficient and the closed-loop adjustment amount of the grid-forming device in the previous control period.

[0075] In step S500, the control system determines a balance adjustment amount according to the basic adjustment amount and the reactive power data in the case that the voltage central point bus voltage data and the reactive power data of any one of the grid-forming devices satisfy a second preset condition, to adjust the reactive power of each grid-forming device according to the balance adjustment amount.

[0076] For example, the second preset condition can be that the voltage central point bus voltage data is within a preset range, and the reactive power data of any one of the grid-forming devices is not within the preset range, and the control system determines the balance 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 balance adjustment amount, to balance the reactive power between each grid-forming device.

[0077] Optionally, the second preset condition is:

[0078] The voltage central point bus voltage data satisfies the following formula: U set -k set ΔU<U t <U set +k set ΔU (1)

[0079] And the reactive power data of any one grid-forming device does not satisfy the following formula:

[0080] U set is a voltage central point bus voltage preset value, K set is a margin coefficient, ΔU is a voltage out-of-limit preset value, U t is voltage central point bus voltage data, is the basic adjustment amount of the grid-forming device of the i-th region, ΔQ is a reactive power balance preset value, Q i is the reactive power of the grid-forming device of the i-th region.

[0081] For example, when the voltage central point bus voltage data and the reactive power data of the grid-forming device satisfy formula (1) and formula (2) at the same time, the control system calculates the balance adjustment amount.

[0082] Optionally, the calculation formula of the balance adjustment amount is:

[0083] is the balance adjustment amount of the grid-forming device of the i-th region, k p is a proportional coefficient, k i is an integral coefficient, S is a complex variable, is the basic adjustment amount of the grid-forming device of the i-th region, Q i is the reactive power of the grid-forming device of the i-th region.

[0084] FIG. 6 shows a schematic diagram of adjustment of the reactive power of the grid-forming device according to an embodiment of the present application.

[0085] For example, as shown in FIG. 6, when the voltage central point bus voltage data is in a normal range, the rapid adjustment of the reactive power of the grid-forming device can be performed to balance the reactive power among the grid-forming devices.

[0086] Through the above example embodiments, the application calculates the basic adjustment amount, the closed-loop adjustment amount and the balancing adjustment amount respectively by collecting the bus voltage data of the gathering station of each network-forming device, the reactive power data of each network-forming device and the voltage hub point bus voltage data, so as to adjust the bus voltage of the gathering station of each network-forming device according to the basic adjustment amount, adjust the voltage hub point bus voltage according to the closed-loop adjustment amount, and adjust the reactive power of each network-forming device according to the balancing adjustment amount.

[0087] Through the adjustment and control of the reactive power of each network-forming device, the application can quickly adjust the voltage hub point bus voltage, so as to improve the voltage adjustment speed after disturbance. The application can also improve the power supply quality of the power system by adjusting the deviation of the voltage hub point bus voltage through closed-loop control, and enhance the support capability of the transient voltage of the power system by balancing the reactive power between each network-forming device, so as to improve the support strength of the new energy power system.

[0088] According to another aspect of the application, the application provides a control system for the reactive power of a multi-region network-forming device. FIG. 7 shows a schematic diagram of the control system according to an embodiment of the application. As shown in FIG. 7, the control system 1 comprises a data acquisition module 10, a basic adjustment amount processing module 20, a closed-loop adjustment amount processing module 30 and a balancing adjustment amount processing module 40.

[0089] According to an example embodiment, the data acquisition module 10 acquires the bus voltage data of the gathering station of each network-forming device and the reactive power data of each network-forming device in the multi-region power system.

[0090] For example, the data acquisition module 10 collects the bus voltage data of the gathering station of each network-forming device, which refers to the voltage collection value on the main power supply line of each network-forming device.

[0091] The data acquisition module 10 also collects the reactive power data of each network-forming device, which refers to the reactive power collection value of each network-forming device.

[0092] The data acquisition module 10 acquires the voltage hub point bus voltage data of the power system.

[0093] For example, the data acquisition module 10 collects the voltage hub point bus voltage data of the power system. The voltage hub point bus voltage refers to the voltage at each side bus node (voltage hub point bus) of a representative hub substation in the power system. The voltage hub point bus voltage data refers to the voltage data at each side bus node.

[0094] The basic regulation amount processing module 20 determines the basic regulation amount of each grid-forming device according to the reactive power data of each grid-forming device, so as to adjust the busbar voltage of the collection station of each grid-forming device according to the basic regulation amount.

[0095] For example, the basic regulation amount processing module 20 can adjust the busbar voltage of the collection station of each grid-forming device according to the basic regulation amount.

[0096] Optionally, the basic regulation amount processing module 20 determines the maximum reactive power data of each grid-forming device and the total reactive power data of all grid-forming devices in the multi-region according to the reactive power data of each grid-forming device.

[0097] 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.

[0098] For example, the basic regulation amount processing module 20 determines the maximum reactive power data of the current grid-forming device according to the reactive power data of each grid-forming device, and the basic regulation amount processing module 20 sums the reactive power data of all grid-forming devices in all regions to obtain the total reactive power data.

[0099] Optionally, the basic regulation amount processing module 20 determines the calculation formula of the basic regulation amount according to the maximum reactive power data and the total reactive power data as follows:

[0100] Q total is the total reactive power data, Q i is the reactive power data of the grid-forming device in the i-th region, is the basic regulation amount of the grid-forming device in the i-th region, is the maximum reactive power of the grid-forming device in the i-th region, and n is the number of regions in the multi-region.

[0101] 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 grid-forming devices in the n regions, the maximum reactive power data of each grid-forming device, and the total reactive power data.

[0102] According to the example embodiment, the closed-loop regulation amount processing module 30 determines the closed-loop regulation amount according to the busbar voltage data of the collection station and the reactive power data in the case that the voltage hub point busbar voltage data meets the first preset condition, so as to adjust the voltage hub point busbar voltage according to the closed-loop regulation amount.

[0103] For example, the first preset condition can be that the voltage center point bus voltage data is not within a preset range. When it is determined that the voltage center point bus voltage data is not within the preset range, the closed-loop adjustment amount processing module 30 determines a closed-loop adjustment amount according to the collection station bus voltage data and the reactive power data, and adjusts the voltage center point bus voltage according to the closed-loop adjustment amount.

[0104] Optionally, the first preset condition can be that: t > U set + ΔU t < U set - ΔU

[0105] U t is voltage center point bus voltage data, U set is a voltage center point bus voltage preset value, and ΔU is a voltage out-of-limit preset value.

[0106] For example, when the voltage center point bus voltage data is greater than the sum of the voltage center point bus voltage preset value and the voltage out-of-limit preset value, or when the voltage center point bus voltage data is less than the difference between the voltage center point bus voltage preset value and the voltage out-of-limit preset value, the closed-loop adjustment amount processing module 30 determines that the voltage center point bus voltage data is not within the preset range.

[0107] Optionally, the closed-loop adjustment amount processing module 30 determines a voltage up-regulation coefficient and a voltage down-regulation coefficient according to the collection station bus voltage data and the reactive power data.

[0108] For example, when the voltage center point bus voltage deviates, the closed-loop adjustment amount determined by the voltage up-regulation coefficient up-regulates the voltage center point bus voltage, or the closed-loop adjustment amount determined by the voltage down-regulation coefficient down-regulates the voltage center point bus voltage. In this way, the deviation of the closed-loop adjustment control voltage center point bus voltage can be realized.

[0109] Optionally, the calculation formula of the voltage up-regulation coefficient is:

[0110] m i is a voltage up-regulation coefficient of the network-forming device of the i-th region, K qv.i is a reactive voltage coefficient of the network-forming device of the i-th region, U i is collection station bus voltage data of the network-forming device of the i-th region, U high is a high value of the collection station bus voltage data, U max is a maximum value of the collection station bus voltage data, Q max is a maximum reactive power of the network-forming device of the i-th region, Q i is a reactive power of the network-forming device of the i-th region, K setis a margin coefficient.

[0111] Optionally, the calculation formula of the voltage down-regulation coefficient is:

[0112] n i is the voltage down-regulation coefficient of the grid-forming device of the ith region, K qv.i is the reactive voltage coefficient of the grid-forming device of the ith region, 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 grid-forming device of the ith region, 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-forming device of the ith region, Q i is the reactive power of the grid-forming device of the ith region, K set is a margin coefficient.

[0113] Optionally, the calculation formula of the closed-loop regulation amount determined by the closed-loop regulation amount processing module 30 according to the voltage up-regulation coefficient or the voltage down-regulation coefficient is:

[0114] is the closed-loop regulation amount of the grid-forming device of the ith region, is the closed-loop regulation amount of the previous control period of the grid-forming device of the ith region, U set is the preset value of the voltage center point bus voltage, U t is the voltage center point bus voltage data, and δε is the voltage regulation dead zone.

[0115] For example, when the voltage center point bus voltage data is greater than a certain preset threshold (such as greater than the sum of the preset value of the voltage center point bus voltage and the voltage regulation dead zone), the closed-loop regulation amount processing module 30 calculates the closed-loop regulation amount according to the voltage up-regulation coefficient and the closed-loop regulation amount of the previous control period of the grid-forming device. And when the voltage center point bus voltage data is less than a certain preset threshold (such as less than the difference between the preset value of the voltage center point bus voltage and the voltage regulation dead zone), the closed-loop regulation amount processing module 30 calculates the closed-loop regulation amount according to the voltage down-regulation coefficient and the closed-loop regulation amount of the previous control period of the grid-forming device.

[0116] According to the example embodiment, the equalization regulation amount processing module 40 determines the equalization regulation amount according to the basic regulation amount and the reactive power data in the case that the voltage center point bus voltage data and the reactive power data of any one of the grid-forming devices satisfy the second preset condition, to adjust the reactive power of each grid-forming device according to the equalization regulation amount.

[0117] For example, the second preset condition can be that the voltage center point bus voltage data is within a preset range, and there is a case that reactive power data of any one grid-forming device is not within a preset range, and the equalization adjustment amount processing module 40 determines the equalization adjustment amount according to the basic adjustment amount and the reactive power data. And the equalization adjustment amount processing module 40 adjusts the reactive power of each grid-forming device according to the equalization adjustment amount, so as to equalize the reactive power between each grid-forming device.

[0118] Optionally, the second preset condition is that:

[0119] The voltage center point bus voltage data satisfies the following formula: U set -k set ΔU<U t <U set +k set ΔU (1)

[0120] And the reactive power data of any one grid-forming device does not satisfy the following formula:

[0121] U set is a voltage center point bus voltage preset value, K set is a margin coefficient, ΔU is a voltage out-of-limit preset value, U t is voltage center point bus voltage data, is the basic adjustment amount of the grid-forming device of the i th region, ΔQ is a reactive power equalization preset value, Q i is the reactive power of the grid-forming device of the i th region.

[0122] For example, when the voltage center point bus voltage data and the reactive power data of the grid-forming device satisfy formula (1) and formula (2) at the same time, the control system calculates the equalization adjustment amount.

[0123] Optionally, the calculation formula of the equalization adjustment amount is:

[0124] is the equalization adjustment amount of the grid-forming device of the i th region, K p is a proportional coefficient, K i is an integral coefficient, S is a complex variable, is the basic adjustment amount of the grid-forming device of the i th region, Q i is the reactive power of the grid-forming device of the i th region.

[0125] Through the above example embodiments, the application calculates the basic adjustment amount, the closed-loop adjustment amount and the balancing adjustment amount respectively by the collected bus voltage data of the collection station of each network-forming device, the reactive power data of each network-forming device and the voltage hub point bus voltage data, so as to adjust the bus voltage of the collection station of each network-forming device according to the basic adjustment amount, adjust the voltage hub point bus voltage according to the closed-loop adjustment amount, and adjust the reactive power of each network-forming device according to the balancing adjustment amount.

[0126] Through the adjustment and control of the reactive power of each network-forming device, the application can quickly adjust the voltage hub point bus voltage, so as to improve the voltage adjustment speed after disturbance. The application can also improve the power supply quality of the power system by closed-loop control of the deviation of the voltage hub point bus voltage, and enhance the support capability of the transient voltage of the power system by balancing adjustment of the reactive power between each network-forming device, so as to improve the support strength of the new energy power system.

[0127] According to still another aspect of the application, the application further provides an electronic device. The electronic device comprises 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.

[0128] According to still another aspect of the application, the application further provides a non-volatile computer-readable storage medium. The storage medium stores a computer program, which, when executed by a processor, can implement the control method as described above.

[0129] Finally, it should be noted that the above only describes the preferred embodiments of the application and is not intended to limit the application. Although the application is 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 make equivalent replacements to some technical features. Any modification, equivalent replacement, improvement, etc. made within the spirit and principles of the application shall be included in the protection scope of the application.

Claims

1. A method for controlling reactive power of multi-region network-type equipment, characterized in that, The method comprises: acquiring bus voltage data of a collection station of each network-forming device in a multi-region power system and reactive power data of the each network-forming device; acquiring voltage hub point bus voltage data of the power system; determining a basic adjustment amount of the each network-forming device according to the reactive power data of the each network-forming device, so as to adjust the bus voltage of the collection station of the each network-forming device according to the basic adjustment amount; in a case where the voltage hub point bus voltage data satisfies a first preset condition, determining a closed-loop adjustment amount according to the bus voltage data of the collection station and the reactive power data, so as to adjust the voltage hub point bus voltage according to the closed-loop adjustment amount; in a case where the voltage hub point bus voltage data and the reactive power data of any one network-forming device satisfy a second preset condition, determining a balancing adjustment amount according to the basic adjustment amount and the reactive power data, so as to adjust the reactive power of the each network-forming device according to the balancing adjustment amount.

2. The control method according to claim 1, characterized by, The determining of the basic adjustment amount of the each network-forming device according to the reactive power data of the each network-forming device comprises: determining maximum reactive power data of the each network-forming device and total reactive power data of all network-forming devices in the multi-region according to the reactive power data of the each network-forming device; determining the basic adjustment amount according to the maximum reactive power data and the total reactive power data.

3. The control method according to claim 2, characterized by, The calculation formula for determining the base adjustment amount according to the maximum reactive power data and the total reactive power data is: wherein Q total is the total reactive power data, Q i is the reactive power data of the grid-forming device of the i-th region, a base adjustment amount of the networked device for the i-th region, The maximum reactive power of the network-forming device in the i th region, n is the number of regions of the multi-region.

4. The control method according to claim 1, characterized by, The first preset condition is: U t > U set + ΔU t < U set - ΔU Wherein, U t is the voltage central point bus voltage data, U set is the voltage central point bus voltage preset value, and ΔU is the voltage out-of-limit preset value. The determining of the closed-loop adjustment amount according to the bus voltage data of the collection station and the reactive power data comprises: determining a voltage up-regulation coefficient and a voltage down-regulation 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.

5. The control method according to claim 4, characterized by The calculation formula of the voltage up-regulation coefficient is: wherein, m i is the voltage up-regulation coefficient of the grid-forming device of the i-th zone, K qv.i is the reactive voltage coefficient of the grid-forming device of the i-th zone, U i is the aggregate station bus voltage data of the grid-forming device of the i-th zone, U high is the high value of the aggregate station bus voltage data, U max is the maximum value of the aggregate station bus voltage data, Q max is the maximum reactive power of the grid-forming device of the i-th zone, Q i is the reactive power of the grid-forming device of the i-th zone, K set is the margin coefficient.

6. The control method according to claim 5, characterized by The calculation formula of the voltage down-regulation coefficient is: wherein n i is the voltage down coefficient of the grid-forming device of the i-th region, K qv.i is the reactive voltage coefficient of the grid-forming device of the i-th region, U low is the low value of the bus voltage data of the collection station, U i is the bus voltage data of the grid-forming device of the i-th region, 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-forming device of the i-th region, Q i is the reactive power of the grid-forming device of the i-th region, K set is the margin coefficient.

7. The control method according to claim 6, characterized by The calculation formula for determining the closed-loop adjustment amount according to the voltage up-regulation coefficient or the voltage down-regulation coefficient is: wherein a closed-loop control variable of the networked device for the i-th region, U is the closed-loop control amount of the networked device in the i-th region in the last control cycle set U is the voltage preset value of the voltage center point bus voltage t U is the voltage data of the voltage center point bus voltage, and Δε is the voltage regulation dead zone.

8. The control method according to claim 1, characterized by, The second preset condition is that: the voltage hub point bus voltage data satisfies the following formula: U set -k set ΔU < U t <U set +k set ΔU And, the reactive power data of the arbitrary one of the networked devices does not satisfy the following formula: Wherein, U set is a voltage preset value of the central bus, K set is a margin coefficient, ΔU is a voltage out-of-limit preset value, U t is the voltage data of the central bus, The basic adjustment amount of the network-forming device of the ith region is ΔQ, the reactive power balance preset value is Q i The reactive power of the network-forming device of the ith region is Q The calculation formula of the equalization adjustment amount is: wherein, k is a proportional coefficient, k p k is a proportional coefficient, k i S is a complex variable, Q is the base regulating quantity of the grid-forming device for the i-th region i Qi is the reactive power of the grid-forming device for the i-th region.

9. A control system for reactive power of multi-region network-type equipment, characterized in that, The control system is used for executing the control method as claimed in any one of claims 1-8, and the control comprises: a data acquisition module, which acquires bus voltage data of a collection station of each network-forming device in a multi-region power system and reactive power data of the each network-forming device; and acquires voltage hub point bus voltage data of the power system; a basic adjustment amount processing module, which determines a basic adjustment amount of the each network-forming device according to the reactive power data of the each network-forming device, so as to adjust the bus voltage of the collection station of the each network-forming device according to the basic adjustment amount; a closed-loop adjustment amount processing module, which, in a case where the voltage hub point bus voltage data satisfies a first preset condition, determines a closed-loop adjustment amount according to the bus voltage data of the collection station and the reactive power data, so as to adjust the voltage hub point bus voltage according to the closed-loop adjustment amount; a balancing adjustment amount processing module, which, in a case where the voltage hub point bus voltage data and the reactive power data of any one network-forming device satisfy a second preset condition, determines a balancing adjustment amount according to the basic adjustment amount and the reactive power data, so as to adjust the reactive power of the each network-forming device according to the balancing adjustment amount.

10. An electronic device, comprising: The method comprises: 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, cause the one or more processors to carry out the control method according to any one of claims 1-8.

11. A non-transitory computer readable storage medium having stored thereon a computer program, characterized in that, The computer program, when executed by a processor, carries out the control method according to any one of claims 1-8.

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