Distributed phase modifier configuration method and apparatus

Abstract

A distributed phase modifier configuration method and device, the method comprising: calculating a new energy multi-station short circuit ratio of each unit according to power flow data; judging whether the new energy multi-station short circuit ratio of each unit is greater than a critical value; if yes, determining a current distributed phase modifier configuration scheme as a final distributed phase modifier configuration scheme; if no, optimizing the current distributed phase modifier configuration scheme based on the new energy multi-station short circuit ratio of each unit and a power conversion factor, and returning to the new energy multi-station short circuit ratio calculation step. Through the method and device provided in the embodiment of the application, the problem of entering a dead cycle due to weak voltage support in a region reaching the configuration upper limit is solved, and repeated configuration of the phase modifier in the same position is avoided, so that the goal of maximizing the benefit with the least number of distributed phase modifiers can be achieved.

Description

Technical Field

[0001] This invention relates to the field of power system technology, and more specifically, to a method, apparatus, and computer storage medium for configuring distributed synchronous condensers. Background Technology

[0002] Distributed synchronous condensers (SSCs) can suppress overvoltages, but given their high investment and operation / maintenance costs, their location selection must consider technical and economic indicators. To maintain grid stability and enhance grid voltage regulation capabilities, SSCs should be located in areas of the grid with poor stability.

[0003] Given the presence of numerous renewable energy sources near the sending end of DC transmission projects, and the constraints imposed on the power output of these renewable energy sources and the operating power of the DC projects by transient overvoltages in these sources, adjustments to the configuration scheme of distributed synchronous condensers are necessary to ensure the safe and stable operation of the power grid. However, current configuration schemes for distributed synchronous condensers suffer from problems such as redundant configurations at the same locations and a vicious cycle where the configuration limit is reached in areas with extremely weak voltage support. Summary of the Invention

[0004] In view of this, the present invention proposes a distributed synchronous condenser configuration method, device and computer storage medium, aiming to solve the problems of repeated configuration at the same location and dead loop due to reaching the configuration limit in areas with extremely weak voltage support in existing distributed synchronous condenser configurations.

[0005] In a first aspect, embodiments of the present invention provide a distributed synchronous condenser configuration method, the method comprising: calculating the short-circuit ratio of new energy multiple power stations for each unit based on power flow data; determining whether the short-circuit ratio of new energy multiple power stations for each unit is greater than a critical value; if so, determining the current distributed synchronous condenser configuration scheme as the final distributed synchronous condenser configuration scheme; if not, optimizing the current distributed synchronous condenser configuration scheme based on the short-circuit ratio of new energy multiple power stations and the power conversion factor for each unit, and then returning to the new energy multiple power station short-circuit ratio calculation step.

[0006] Furthermore, based on the short-circuit ratio and power conversion factor of the new energy multi-site for each unit, the current distributed synchronous condenser configuration scheme is optimized, including: determining the node with the lowest short-circuit ratio of the new energy multi-site for each unit. i low Has the number of synchronous condensers reached the configuration limit? If not, then at the node with the lowest short-circuit ratio in the new energy multi-site power station... i low Add a synchronous condenser; if so, select the node with the lowest short-circuit ratio for the aforementioned new energy multi-station based on the power conversion factor. ilow The node with the greatest impact that has not yet reached its configuration limit is designated as the target node, and a synchronous condenser is added to the target node.

[0007] Furthermore, the node with the lowest short-circuit ratio for the multiple new energy power plants is selected based on the power conversion factor. i low The nodes with the greatest impact that have not yet reached their configuration limits are selected as target nodes. This includes: sorting the renewable energy power stations according to their power conversion factors from largest to smallest or smallest to largest to obtain a first group; removing renewable energy power stations that have reached their synchronous condenser configuration limits from the first group to obtain a second group; and selecting the node with the lowest short-circuit ratio among the multiple renewable energy power stations in the second group. i low As the target node.

[0008] Furthermore, before calculating the short-circuit ratio of new energy multi-stations for each unit based on power flow data, the process includes: collecting power system information and performing power flow rationality analysis based on the power system information to obtain power flow data.

[0009] Furthermore, based on the power system information, a power flow rationality analysis is performed to obtain power flow data, including: based on the power system information, checking node voltage, line power, and transformer grid connection power to confirm power flow convergence and rationality, and obtaining power flow data. If the power flow does not converge or is unreasonable, the power system parameters are readjusted and the power flow rationality analysis is performed again.

[0010] Furthermore, the short-circuit ratio (MRSCR) of the new energy multi-station is obtained using the following formula: ; in, S aci The three-phase short-circuit capacity of the grid-side access point / station connection point of new energy power generation equipment; N The total number of new energy generating units in the region; P i , P j Respectively, new energy units i , j The active power injected into the system; λ ij For new energy grid-connected bus i and j The power conversion factor between the two is obtained using the following formula: ; in, Z eqij The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OKj Column elements, Z eqii The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK i Column elements; j ∈ N , j ≠ i ,and i , j All are positive integers.

[0011] Secondly, embodiments of the present invention also provide a distributed synchronous condenser configuration device, the device comprising: a first calculation unit, configured to calculate the short-circuit ratio of renewable energy multiple power stations for each unit based on power flow data; a first judgment unit, configured to determine whether the short-circuit ratio of renewable energy multiple power stations for each unit is greater than a critical value; a first processing unit, configured to determine the current distributed synchronous condenser configuration scheme as the final distributed synchronous condenser configuration scheme when the short-circuit ratio of renewable energy multiple power stations for each unit is greater than the critical value; and a second processing unit, configured to optimize the current distributed synchronous condenser configuration scheme based on the short-circuit ratio of renewable energy multiple power stations for each unit and a power conversion factor, and then return the optimization to the first calculation unit when the short-circuit ratio of renewable energy multiple power stations for each unit is less than or equal to the critical value.

[0012] Furthermore, based on the short-circuit ratio and power conversion factor of the new energy multi-site for each unit, the current distributed synchronous condenser configuration scheme is optimized, including: determining the node with the lowest short-circuit ratio of the new energy multi-site for each unit. i low Has the number of synchronous condensers reached the configuration limit? If not, then at the node with the lowest short-circuit ratio in the new energy multi-site power station... i low Add a synchronous condenser; if so, select the node with the lowest short-circuit ratio for the aforementioned new energy multi-station based on the power conversion factor. i low The node with the greatest impact that has not yet reached its configuration limit is designated as the target node, and a synchronous condenser is added to the target node.

[0013] Furthermore, the node with the lowest short-circuit ratio for the multiple new energy power plants is selected based on the power conversion factor. i low The nodes with the greatest impact that have not yet reached their configuration limits are selected as target nodes. This includes: sorting the renewable energy power stations according to their power conversion factors from largest to smallest or smallest to largest to obtain a first group; removing renewable energy power stations that have reached their synchronous condenser configuration limits from the first group to obtain a second group; and selecting the node with the lowest short-circuit ratio among the multiple renewable energy power stations in the second group. i lowAs the target node.

[0014] Furthermore, the device also includes a power flow rationality analysis unit, used to: collect power system information and perform power flow rationality analysis based on the power system information to obtain power flow data.

[0015] Furthermore, based on the power system information, a power flow rationality analysis is performed to obtain power flow data, including: based on the power system information, checking node voltage, line power, and transformer grid connection power to confirm power flow convergence and rationality, and obtaining power flow data. If the power flow does not converge or is unreasonable, the power system parameters are readjusted and the power flow rationality analysis is performed again.

[0016] Furthermore, the short-circuit ratio (MRSCR) of the new energy multi-station is obtained using the following formula: ; in, S aci The three-phase short-circuit capacity of the grid-side access point / station connection point of new energy power generation equipment; N The total number of new energy generating units in the region; P i , P j Respectively, new energy units i , j The active power injected into the system; λ ij For new energy grid-connected bus i and j The power conversion factor between the two is obtained using the following formula: ; in, Z eqij The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK j Column elements, Z eqii The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK i Column elements; j ∈ N , j ≠ i ,and i , j All are positive integers.

[0017] Thirdly, embodiments of the present invention also provide a computer-readable storage medium having a computer program stored thereon, which, when executed by a processor, implements the methods provided in the above embodiments.

[0018] Fourthly, embodiments of the present invention also provide an electronic device, including: a processor; a memory for storing executable instructions of the processor; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the methods provided in the above embodiments.

[0019] The distributed synchronous condenser configuration method, device, and computer storage medium provided in this invention optimize the distributed synchronous condenser configuration scheme for units with a short-circuit ratio greater than a critical value in new energy multi-stations by using the short-circuit ratio and power conversion factor of new energy multi-stations. This solves the problem of entering a dead loop due to reaching the configuration limit in areas with extremely weak voltage support, and avoids repeatedly configuring synchronous condensers in the same location. It can achieve the goal of maximizing benefits with the minimum number of distributed synchronous condensers, and the analysis and calculation are simple and widely adaptable. Attached Figure Description

[0020] Figure 1 An exemplary flowchart of a distributed camera adjustment method according to an embodiment of the present invention is shown; Figure 2 A simplified structural diagram of a typical ultra-high voltage direct current transmission system according to an embodiment of the present invention is shown; Figure 3 A schematic diagram of a distributed synchronous condenser configuration device according to an embodiment of the present invention is shown. Detailed Implementation

[0021] Exemplary embodiments of the invention will now be described with reference to the accompanying drawings. However, the invention may be embodied in many different forms and is not limited to the embodiments described herein. These embodiments are provided to fully and completely disclose the invention and to fully convey its scope to those skilled in the art. The terminology used in the exemplary embodiments illustrated in the drawings is not intended to limit the invention. In the drawings, the same units / elements are referred to by the same reference numerals.

[0022] Unless otherwise stated, the terms used herein (including technical terms) have their common meaning as understood by one of ordinary skill in the art. Furthermore, it is understood that terms defined in commonly used dictionaries should be understood to have a meaning consistent with the context of their relevant field, and not to be interpreted as having an idealized or overly formal meaning.

[0023] Figure 1 An exemplary flowchart of a distributed camera configuration method according to an embodiment of the present invention is shown.

[0024] like Figure 1 As shown, the method includes: Step S101: Calculate the short-circuit ratio of new energy multi-stations for each unit based on power flow data.

[0025] The multiple renewable energy station short circuit ratio (MRSCR) is a short circuit ratio indicator that takes into account the mutual influence between multiple renewable energy stations. This indicator considers the amplitude and phase difference of various electrical quantities between different nodes and can also account for the reactive power impact of renewable energy generation equipment. It is applicable to voltage intensity assessment calculations for multiple renewable energy station access systems under various scenarios. The MRSCR reflects the voltage intensity of the multiple renewable energy station access system and the grid's reactive power and voltage support capacity for the grid-side access point / station grid connection point of the renewable energy generation equipment.

[0026] Furthermore, the short-circuit ratio (MRSCR) of multiple new energy power plants is obtained using the following formula: (1); in, S aci The three-phase short-circuit capacity of the grid-side access point / station connection point of new energy power generation equipment; N The total number of new energy generating units in the region; P i , P j Respectively, new energy units i , j The active power injected into the system; λ ij For new energy grid-connected bus i and j The power conversion factor between the two is obtained using the following formula: (2); in, Z eqij The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK j Column elements, Z eqii The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK i Column elements; j ∈ N , j ≠ i ,and i , j All are positive integers.

[0027] Qualitatively speaking, based on formula (1), i The smaller the unit's output, the lower the MRSCR. i The larger the unit i The higher the grid voltage at the connection point, the greater the impact of the output of other renewable energy units in the region on the MRSCR, depending on the magnitude of the conversion factor. i The size of the area; overall, the output of regional new energy units is reduced, and the MRSCR of each new energy unit in the area tends to increase. This corresponds to a greater voltage intensity of multiple new energy power stations connected to the system, and a greater reactive voltage support capacity of the power grid for the grid-side access point bus of new energy power generation equipment.

[0028] When using MRSCR as a grid voltage strength indicator, the short-circuit ratio of multiple substations on the low-voltage side of the step-up transformer of the new energy power generation unit should not be less than a certain limit. This is the minimum requirement that the equipment needs to meet for stable operation, thus forming the constraint condition for the grid voltage strength evaluation index.

[0029] Further, prior to step S101, the following steps are included: Power system information is collected, and power flow rationality analysis is performed based on the power system information to obtain power flow data.

[0030] Power system information, including the total number of new energy generating units within the target power grid area. N Active power values ​​of each new energy node Maximum number of synchronous condensers configured at each station N lim Short-circuit capacity Power system topology and power conversion factor λ ij Impedance matrix And the maximum number of camera configurations per configuration node.

[0031] Furthermore, power flow rationality analysis is performed based on power system information to obtain power flow data, including: Based on power system information, check node voltage, line power, and transformer grid connection power to confirm power flow convergence and rationality, and obtain power flow data. If the power flow does not converge or is unreasonable, readjust the power system parameters and re-analyze the power flow rationality.

[0032] Step S102: Determine whether the short-circuit ratio of each unit's new energy multi-site is greater than the critical value; Step S103: If yes, then the current distributed synchronous condenser configuration scheme is determined as the final distributed synchronous condenser configuration scheme; Step S104: If not, then optimize the current distributed synchronous condenser configuration scheme based on the short-circuit ratio and power conversion factor of each unit's new energy multi-site, and return to the new energy multi-site short-circuit ratio calculation step.

[0033] Different critical values ​​can be used in different calculation scenarios; the power conversion factor is obtained by using the previous formula (2).

[0034] Furthermore, based on the short-circuit ratio and power conversion factor of each generating unit's new energy multi-station, the current distributed synchronous condenser configuration scheme is optimized, including: Determine the node with the lowest short-circuit ratio at each renewable energy multi-site power plant for each unit. i low Has the number of cameras reached the configuration limit? If not, then at the node where the short-circuit ratio of multiple new energy power stations is lowest. i low Add one camera converter; If so, then select the node with the lowest short-circuit ratio for multiple renewable energy power plants based on the power conversion factor. i low The node with the greatest impact that has not yet reached its configuration limit is designated as the target node, and a synchronous condenser is added to the target node.

[0035] The maximum number of synchronous condensers that can be configured on each configuration node is given by the local new energy power station.

[0036] Furthermore, based on the power conversion factor, the node with the lowest short-circuit ratio for multiple renewable energy power plants is selected. i low The nodes most affected that have not yet reached their configuration limits are designated as target nodes, including: The new energy power stations are sorted according to the power conversion factor from largest to smallest or from smallest to largest to obtain the first sequence group; New energy power stations that have reached the upper limit of the number of synchronous condensers can be removed from the first group to obtain the second group. Select the node with the lowest short-circuit ratio among the new energy multi-site power plants in the second sequence group. i low As the target node.

[0037] The above embodiments optimize the distributed synchronous condenser configuration scheme for units with a short-circuit ratio greater than the critical value in new energy multi-stations by using the short-circuit ratio and power conversion factor of new energy multi-stations. This solves the problem of entering a dead loop due to reaching the configuration limit in areas with extremely weak voltage support. At the same time, it avoids repeatedly configuring synchronous condensers in the same location. It can achieve the goal of maximizing benefits with the minimum number of distributed synchronous condensers. Furthermore, the analysis and calculation are simple and the scheme has wide applicability.

[0038] Example 1 Figure 2 A simplified structural diagram of a typical ultra-high voltage direct current (UHVDC) transmission system according to an embodiment of the present invention is shown. Figure 2 As shown, the power grid contains centralized renewable energy bases with an installed capacity exceeding 10 million kilowatts, accounting for over 80% of the total installed capacity. This power grid connects to the main grid via AC channels and also transmits power to receiving-end grids via DC channels. The main conventional generating units within this grid are located relatively far from the renewable energy bases, exhibiting a high degree of power electronics characteristics.

[0039] Under the condition of high-volume renewable energy generation, the lowest short-circuit ratio at the generator terminals of renewable energy plants across the entire network is 1.162, and the lowest short-circuit ratio at the grid connection point is 1.395. Considering that the recommended critical short-circuit ratio (MRSCRS) for renewable energy plant grid connection points is 2.0~2.5, it is clear that both the generator terminal short-circuit ratio and the grid connection point short-circuit ratio of this system are below the minimum requirements, thus failing to meet the criteria and necessitating the configuration of synchronous condensers.

[0040] For a typical power transmission system, based on the distributed synchronous condenser configuration method proposed in this patent embodiment, after configuring the synchronous condensers, a total of 10 300Mvar synchronous condensers (6 of which are configured on the grid connection point bus of the new energy power station under the collection station A, and 4 are centrally configured on the AC bus of the converter station) and 25 50Mvar synchronous condensers (including the 15 planned distributed synchronous condensers) can be configured in two new energy bases. This can make the short-circuit ratio at the generator end as low as 1.654 and the short-circuit ratio at the grid connection point as low as 2.653, satisfying the formula. The specific calculation results are shown in Table 1. The system is under high voltage support strength, and the total configuration capacity is 4250MVar.

[0041] Table 1. MRSCRS and MRSCRG at the grid connection point of the new energy power station after configuring the synchronous condenser

[0042] Figure 3 A schematic diagram of a distributed synchronous condenser configuration device according to an embodiment of the present invention is shown.

[0043] like Figure 3 As shown, the device includes: The first calculation unit 301 is used to calculate the short-circuit ratio of new energy multi-site for each unit based on power flow data.

[0044] The multiple renewable energy station short circuit ratio (MRSCR) is a short circuit ratio indicator that takes into account the mutual influence between multiple renewable energy stations. This indicator considers the amplitude and phase difference of various electrical quantities between different nodes and can also account for the reactive power impact of renewable energy generation equipment. It is applicable to voltage strength assessment calculations for multiple renewable energy station access systems under various scenarios. The MRSCR reflects the voltage strength of the multiple renewable energy station access system and the grid's reactive power and voltage support capacity for the grid-side access point / station grid connection point of the renewable energy generation equipment.

[0045] Furthermore, the short-circuit ratio (MRSCR) of multiple new energy power plants is obtained using the following formula: (3); in, S aci The three-phase short-circuit capacity of the grid-side access point / station connection point of new energy power generation equipment; N The total number of new energy generating units in the region; P i , P j Respectively, new energy units i , j The active power injected into the system; λ ij For new energy grid-connected bus i and j The power conversion factor between the two is obtained using the following formula: (4); in, Z eqij The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK j Column elements, Z eqii The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK i Column elements; j ∈ N , j ≠ i ,and i , j All are positive integers.

[0046] Qualitatively speaking, based on formula (3), i The smaller the unit's output, the lower the MRSCR.i The larger the unit i The higher the grid voltage at the connection point, the greater the impact of the output of other renewable energy units in the region on the MRSCR, depending on the magnitude of the conversion factor. i The size of the area; overall, the output of regional new energy units is reduced, and the MRSCR of each new energy unit in the area tends to increase. This corresponds to a greater voltage intensity of multiple new energy power stations connected to the system, and a greater reactive voltage support capacity of the power grid for the grid-side access point bus of new energy power generation equipment.

[0047] When using MRSCR as a grid voltage strength indicator, the short-circuit ratio of multiple substations on the low-voltage side of the step-up transformer of the new energy power generation unit should not be less than a certain limit. This is the minimum requirement that the equipment needs to meet for stable operation, thus forming the constraint condition for the grid voltage strength evaluation index.

[0048] Furthermore, the device also includes a power flow rationality analysis unit, used for: Power system information is collected, and power flow rationality analysis is performed based on the power system information to obtain power flow data.

[0049] Power system information, including the total number of new energy generating units within the target power grid area. N Active power values ​​of each new energy node Maximum number of synchronous condensers configured at each station N lim Short-circuit capacity Power system topology and power conversion factor λ ij Impedance matrix And the maximum number of camera configurations per configuration node.

[0050] Furthermore, power flow rationality analysis is performed based on power system information to obtain power flow data, including: Based on power system information, check node voltage, line power, and transformer grid connection power to confirm power flow convergence and rationality, and obtain power flow data. If the power flow does not converge or is unreasonable, readjust the power system parameters and re-analyze the power flow rationality.

[0051] The first judgment unit 302 is used to determine whether the short-circuit ratio of the new energy multi-site of each unit is greater than the critical value; The first processing unit 303 is used to determine the current distributed synchronous condenser configuration scheme as the final distributed synchronous condenser configuration scheme when the short-circuit ratio of the new energy multi-site of each unit is greater than the critical value. The second processing unit 304 is used to optimize the current distributed synchronous condenser configuration scheme based on the short-circuit ratio of new energy multi-stations of each unit and the power conversion factor when the short-circuit ratio of new energy multi-stations of each unit is less than or equal to the critical value, and then return it to the first calculation unit 301.

[0052] Different critical values ​​can be used in different calculation scenarios; the power conversion factor is obtained by using the previous formula (4).

[0053] Furthermore, based on the short-circuit ratio and power conversion factor of each generating unit's new energy multi-station, the current distributed synchronous condenser configuration scheme is optimized, including: Determine the node with the lowest short-circuit ratio at each renewable energy multi-site power plant for each unit. i low Has the number of cameras reached the configuration limit? If not, then at the node where the short-circuit ratio of multiple new energy power stations is lowest. i low Add one camera converter; If so, then select the node with the lowest short-circuit ratio for multiple renewable energy power plants based on the power conversion factor. i low The node with the greatest impact that has not yet reached its configuration limit is designated as the target node, and a synchronous condenser is added to the target node.

[0054] The maximum number of synchronous condensers that can be configured on each configuration node is given by the local new energy power station.

[0055] Furthermore, based on the power conversion factor, the node with the lowest short-circuit ratio for multiple renewable energy power plants is selected. i low The nodes most affected that have not yet reached their configuration limits are designated as target nodes, including: The new energy power stations are sorted according to the power conversion factor from largest to smallest or from smallest to largest to obtain the first sequence group; New energy power stations that have reached the upper limit of the number of synchronous condensers can be removed from the first group to obtain the second group. Select the node with the lowest short-circuit ratio among the new energy multi-site power plants in the second sequence group. i low As the target node.

[0056] The above embodiments optimize the distributed synchronous condenser configuration scheme for units with a short-circuit ratio greater than the critical value in new energy multi-stations by using the short-circuit ratio and power conversion factor of new energy multi-stations. This solves the problem of entering a dead loop due to reaching the configuration limit in areas with extremely weak voltage support. At the same time, it avoids repeatedly configuring synchronous condensers in the same location. It can achieve the goal of maximizing benefits with the minimum number of distributed synchronous condensers. Furthermore, the analysis and calculation are simple and the scheme has wide applicability.

[0057] Example 2 Figure 2 A simplified structural diagram of a typical ultra-high voltage direct current (UHVDC) transmission system according to an embodiment of the present invention is shown. Figure 2 As shown, the power grid contains centralized renewable energy bases with an installed capacity exceeding 10 million kilowatts, accounting for over 80% of the total installed capacity. This power grid connects to the main grid via AC channels and also transmits power to receiving-end grids via DC channels. The main conventional generating units within this grid are located relatively far from the renewable energy bases, exhibiting a high degree of power electronics characteristics.

[0058] Under the condition of high-volume renewable energy generation, the lowest short-circuit ratio at the generator terminals of renewable energy plants across the entire network is 1.162, and the lowest short-circuit ratio at the grid connection point is 1.395. Considering that the recommended critical short-circuit ratio (MRSCRS) for renewable energy plant grid connection points is 2.0~2.5, it is clear that both the generator terminal short-circuit ratio and the grid connection point short-circuit ratio of this system are below the minimum requirements, thus failing to meet the criteria and necessitating the configuration of synchronous condensers.

[0059] For a typical power transmission system, based on the distributed synchronous condenser configuration device proposed in this patent embodiment, after configuring the synchronous condensers, a total of 10 300Mvar synchronous condensers (6 of which are configured on the grid connection point bus of the new energy power station under the collection station A, and 4 are centrally configured on the AC bus of the converter station) and 25 50Mvar synchronous condensers (including the 15 planned distributed synchronous condensers) can be configured in two new energy bases. This can make the short-circuit ratio at the generator end as low as 1.654 and the short-circuit ratio at the grid connection point as low as 2.653, satisfying the formula. The specific calculation results are shown in Table 2. The system is under high voltage support strength, and the total configuration capacity is 4250MVar.

[0060] Table 2. MRSCRS and MRSCRG at the grid connection point of the new energy power station after configuring the synchronous condenser.

[0061] This invention also provides a computer-readable storage medium storing a computer program thereon, which, when executed by a processor, implements the distributed synchronous condenser configuration method provided in the above embodiments.

[0062] This invention also provides an electronic device, including: a processor; a memory for storing processor-executable instructions; the processor being configured to read the executable instructions from the memory and execute the instructions to implement the distributed camera adjustment method provided in the above embodiments.

[0063] The invention has been described with reference to a few embodiments. However, as will be known to those skilled in the art, and as defined in the appended claims, other embodiments besides those disclosed above fall equivalently within the scope of the invention.

[0064] Generally, all terms used in the claims are to be interpreted according to their ordinary meaning in the art, unless otherwise expressly defined herein. All references to “a / the / the [device, component, etc.]” ​​are openly interpreted as at least one instance of said device, component, etc., unless otherwise expressly stated. The steps of any method disclosed herein need not be performed in the exact order disclosed unless explicitly stated otherwise.

[0065] Those skilled in the art will understand that embodiments of the present invention can be provided as methods, systems, or computer program products. Therefore, the present invention can take the form of a completely hardware embodiment, a completely software embodiment, or an embodiment combining software and hardware aspects. Furthermore, the present invention can take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, etc.) containing computer-usable program code.

[0066] This invention is described with reference to flowchart illustrations and / or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the invention. It will be understood that each block of the flowchart illustrations and / or block diagrams, and combinations of blocks in the flowchart illustrations and / or block diagrams, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, special-purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, generate instructions for implementing the flowchart illustrations and / or block diagrams. Figure 1 One or more processes and / or boxes Figure 1 A device that provides the functions specified in one or more boxes.

[0067] These computer program instructions may also be stored in a computer-readable storage medium that can direct a computer or other programmable data processing device to function in a particular manner, such that the instructions stored in the computer-readable storage medium produce an article of manufacture including instruction means, which are implemented in a process Figure 1 One or more processes and / or boxes Figure 1 The function specified in one or more boxes.

[0068] These computer program instructions may also be loaded onto a computer or other programmable data processing equipment to cause a series of operational steps to be performed on the computer or other programmable equipment to produce a computer-implemented process, thereby providing instructions that execute on the computer or other programmable equipment for implementing the process. Figure 1 One or more processes and / or boxes Figure 1 The steps of the function specified in one or more boxes.

[0069] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and not to limit it. Although the present invention has been described in detail with reference to the above embodiments, those skilled in the art should understand that modifications or equivalent substitutions can still be made to the specific implementation of the present invention. Any modifications or equivalent substitutions that do not depart from the spirit and scope of the present invention should be covered within the scope of protection of the claims of the present invention.

Claims

1. A method for configuring distributed synchronous condensers, characterized in that, The method includes: Based on the power flow data, calculate the short-circuit ratio of new energy multi-site for each unit; Determine whether the short-circuit ratio of the new energy multi-site for each unit is greater than the critical value; If so, the current distributed synchronous condenser configuration scheme will be determined as the final distributed synchronous condenser configuration scheme; If not, then based on the short-circuit ratio and power conversion factor of each new energy multi-site power plant, the current distributed synchronous condenser configuration scheme is optimized, and the calculation step of the short-circuit ratio of the new energy multi-site power plant is returned; Among these optimizations, based on the short-circuit ratio and power conversion factor of each generating unit at multiple renewable energy power stations, the current distributed synchronous condenser configuration scheme is optimized, including: Determine the node with the lowest short-circuit ratio among the new energy multi-site power plants for each unit. i low Has the number of cameras reached the configuration limit? If not, then at the node with the lowest short-circuit ratio among the multiple new energy power stations. i low Add one camera converter; If so, then select the node with the lowest short-circuit ratio for the aforementioned new energy multi-site based on the power conversion factor. i low The node with the greatest impact that has not yet reached its configuration limit is designated as the target node, and a synchronous condenser is added to the target node. Among them, the node with the lowest short-circuit ratio for the new energy multi-site is selected based on the power conversion factor. i low The nodes most affected that have not yet reached their configuration limits are designated as target nodes, including: The new energy power stations are sorted according to the power conversion factor from largest to smallest or from smallest to largest to obtain the first sequence group; New energy power stations that have reached the upper limit of the number of synchronous condensers can be removed from the first sequence group to obtain the second sequence group; Select the node with the lowest short-circuit ratio among the new energy multi-sites in the second sequence group. i low As the target node.

2. The method according to claim 1, characterized in that, Before calculating the short-circuit ratio of each generating unit across multiple power stations based on power flow data, the following steps are included: Power system information is collected, and power flow rationality analysis is performed based on the power system information to obtain power flow data.

3. The method according to claim 2, characterized in that, Based on the power system information, a power flow rationality analysis is performed to obtain power flow data, including: Based on the power system information, check the node voltage, line power, and transformer grid connection power to confirm the power flow convergence and rationality, and obtain power flow data. If the power flow does not converge or is unreasonable, readjust the power system parameters and re-analyze the power flow rationality.

4. The method according to claim 1, characterized in that, The short-circuit ratio (MRSCR) of the new energy multi-station is obtained using the following formula: ； in, S aci The three-phase short-circuit capacity of the grid-side access point / station connection point of new energy power generation equipment; N The total number of new energy generating units in the region; P i , P j Respectively, new energy units i , j The active power injected into the system; λ ij For new energy grid-connected bus i and j The power conversion factor between the two is obtained using the following formula: ； in, Z eqij The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK j Column elements, Z eqii The first equivalent impedance matrix between new energy sources and the main grid equivalent power sources is the first... i OK i Column elements; j ∈ N , j ≠ i ,and i , j All are positive integers.

5. A distributed synchronous condenser configuration device, characterized in that, The device includes: The first calculation unit is used to calculate the short-circuit ratio of new energy multi-site for each unit based on power flow data; The first judgment unit is used to determine whether the short-circuit ratio of the new energy multi-site power generation of each unit is greater than a critical value: The first processing unit is used to determine the current distributed synchronous condenser configuration scheme as the final distributed synchronous condenser configuration scheme when the short-circuit ratio of the new energy multi-site of each unit is greater than the critical value. The second processing unit is used to optimize the current distributed synchronous condenser configuration scheme based on the short-circuit ratio of the new energy multi-site of each unit and the power conversion factor when the short-circuit ratio of the new energy multi-site of each unit is less than or equal to the critical value, and then return to the first calculation unit. Among these optimizations, based on the short-circuit ratio and power conversion factor of each generating unit at multiple renewable energy power stations, the current distributed synchronous condenser configuration scheme is optimized, including: Determine the node with the lowest short-circuit ratio among the new energy multi-site power plants for each unit. i low Has the number of cameras reached the configuration limit? If not, then at the node with the lowest short-circuit ratio among the multiple new energy power stations. i low Add one camera converter; If so, then select the node with the lowest short-circuit ratio for the aforementioned new energy multi-site based on the power conversion factor. i low The node with the greatest impact that has not yet reached its configuration limit is designated as the target node, and a synchronous condenser is added to the target node. Among these steps, the node with the lowest short-circuit ratio for the multiple renewable energy power plants is selected based on the power conversion factor. i low The nodes most affected that have not yet reached their configuration limits are designated as target nodes, including: The new energy power stations are sorted according to the power conversion factor from largest to smallest or from smallest to largest to obtain the first sequence group; New energy power stations that have reached the upper limit of the number of synchronous condensers can be removed from the first sequence group to obtain the second sequence group; Select the node with the lowest short-circuit ratio among the new energy multi-sites in the second sequence group. i low As the target node.

6. The apparatus according to claim 5, characterized in that, The device further includes a power flow rationality analysis unit, used for: Power system information is collected, and power flow rationality analysis is performed based on the power system information to obtain power flow data.

7. A computer-readable storage medium having a computer program stored thereon, characterized in that, When the computer program is executed by a processor, it implements the method described in any one of claims 1-4.

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