Power system direct current power coordination control method, system and device and readable storage medium

Abstract

The application discloses a power system DC power coordinated control method and system, device and readable storage medium. The power system DC power coordinated control method comprises the following steps: a first stability control device of a first regional power grid sends a power increase / power decrease instruction, then a first power control device adjusts the power of a first converter station in the first regional power grid to a first power value / fourth power value; a second power control device of a second regional power grid adjusts the power of a second converter station to a second power value / fifth power value, so as to increase / decrease the allocated power supplied to the first regional power grid; when the second power value is not less than a first threshold value, or the fifth power value is not less than a second threshold value, the power of N converter stations located in the second regional power grid in the DC power transmission system between the second regional power grid and M regional power grids is adjusted in proportion, so as to increase / decrease the allocated power supplied to the second regional power grid.

Description

Technical Field

[0001] This application relates to the field of DC power transmission technology in power systems, and more specifically, to a method, system, device, and readable storage medium for coordinated control of DC power transmission in power systems. Background Technology

[0002] A power system consists of power generation facilities, substation facilities, switching facilities, and transmission and distribution systems. A country's or region's power system can be divided into multiple regional power grids based on geographical characteristics. Each regional power grid is independent of the others, but they are interconnected through AC or DC transmission systems to transmit power resources.

[0003] Currently, due to the large-scale construction of DC power transmission projects and the increasingly widespread application of DC power transmission systems, there are increasingly stringent requirements for the safe and stable operation of power systems.

[0004] In the existing technology, adjacent regional power grids can be connected through a DC transmission system. When a fault or emergency occurs in the location of a regional power grid and power needs to be allocated, the connected regional power grid can make corresponding power adjustments to ensure the stable operation of the power system.

[0005] However, the inventors discovered that existing technologies can only regulate the power of the faulty regional power grid through the connected regional power grid. But when the power of the faulty regional power grid changes over a wide range, the stable operation of the regional power grid providing power regulation may be affected.

[0006] For example, when a fault occurs in the DC transmission system of a regional power grid (receiving-end regional power grid) and it is necessary to increase or decrease the external power supply, the connected regional power grid (sending-end regional power grid) adjusts the power of the faulty regional power grid by increasing or decreasing the power supply.

[0007] However, when the DC transmission system of the faulty regional power grid (receiving-end regional power grid) requires large-scale power regulation, the connected regional power grid (sending-end regional power grid) cannot provide large-scale power support due to its own safety concerns. This will cause large power fluctuations in the receiving-end regional power grid, thereby affecting its safe and stable operation. Summary of the Invention

[0008] This application provides a method, system, device, and readable storage medium for coordinated control of DC transmission power in a power system.

[0009] The power system DC transmission power coordination control method includes: the power system includes at least three regional power grids, each regional power grid includes a stabilization control device and at least one converter station, each converter station includes a power control device, and all or part of the regional power grids are interconnected via DC transmission systems through their respective converter stations. A first converter station in a first regional power grid is interconnected with a second converter station in a second regional power grid via a DC transmission system. The power system DC transmission power coordination control method includes: when a first stabilization control device in the first regional power grid issues a power increase command for the first regional power grid, the first power control device in the first regional power grid adjusts the power of the first converter station by a first power control device. The second power control device of the second regional power grid adjusts the power of the second converter station accordingly to increase the dispatch power supplied to the first regional power grid; it judges the magnitude of the second power value and the first threshold; if the second power value is not less than the first threshold, the power of the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and M regional power grids is adjusted proportionally to increase the dispatch power supplied to the second regional power grid; wherein, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is the third power value, and the third power value is not greater than the second power value;

[0010] and / or

[0011] If the first stabilization device of the first regional power grid issues a power reduction command, the first power control device of the first regional power grid will adjust the power of the first converter station to a fourth power value; the second power control device of the second regional power grid will correspondingly adjust the power of the second converter station to a fifth power value to reduce the dispatched power supplied to the first regional power grid; the fifth power value is compared with a second threshold; if the fifth power value is not less than the second threshold, the power of the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and M regional power grids will be adjusted proportionally to reduce the dispatched power supplied to the second regional power grid; wherein, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is a sixth power value, and the sixth power value is not greater than the fifth power value.

[0012] According to some embodiments of this application, the DC transmission system is a double-ended DC transmission system. In the two converter stations of the double-ended DC transmission system, one is in rectification mode and the other is in inverter mode.

[0013] According to some embodiments of this application, the power loss value includes the DC transmission line loss power, grounding electrode line loss power, and converter loss power that change after the power of the two-terminal DC transmission system is adjusted; if the first converter station is in rectification mode and the second converter station is in inverter mode, then the second power value is the difference between the first power value and the power loss value, or the fifth power value is the difference between the fourth power value and the power loss value; if the first converter station is in inverter mode and the second converter station is in rectification mode, then the second power value is the sum of the first power value and the power loss value, or the fifth power value is the sum of the fourth power value and the power loss value.

[0014] According to some embodiments of this application, the DC transmission system is a multi-terminal DC transmission system; in the converter station of the multi-terminal DC transmission system, at least one is in rectification mode and at least one is in inverter mode.

[0015] According to some embodiments of this application, the power loss value includes the DC transmission line loss power, grounding electrode line loss power, and converter loss power that change after the power of the multi-terminal DC transmission system is adjusted; if the first converter station is in rectification mode and the second converter station is in inverter mode, the second power value is the product of the difference between the first power value and the power loss value and the first coefficient, or the fifth power value is the product of the difference between the fourth power value and the power loss value and the first coefficient; if the first converter station is in inverter mode and the second converter station is in rectification mode, the second power value is the product of the sum of the first power value and the power loss value and the second coefficient, or the fifth power value is the product of the sum of the first power value and the power loss value and the second coefficient.

[0016] According to another aspect of this application, a power system DC transmission power coordination control system is provided. The power system includes at least three regional power grids. Each regional power grid includes a stabilization control device and at least one converter station. Each converter station includes a power control device. All or part of the regional power grids are interconnected via DC transmission systems through their respective converter stations. A first converter station in a first regional power grid is interconnected with a second converter station in a second regional power grid via DC transmission systems. The power system DC transmission power coordination control system includes a coordinating control master station, a first coordinating control substation, and N coordinating control substations. The coordinating control master station is used to coordinate and allocate the power of the converter stations in the regional power grids and send power adjustment commands. The first coordinating control substation sends the power adjustment value of the second converter station in the second regional power grid to the coordinating control master station. The N coordinating control substations receive the power adjustment commands sent by the coordinating control master station and send the power adjustment commands to the power control device. The N coordinating control substations are respectively configured in the N converter stations. When the first stabilization control device of the first regional power grid issues a power adjustment command... When an upgrade command is issued, the first power control device of the first regional power grid adjusts the power of the first converter station within the first regional power grid to a first power value, and the second power control device of the second regional power grid adjusts the power of the second converter station accordingly to a second power value. The second power control device sends the second power value to the co-control master station through the first co-control substation. The co-control master station determines the magnitude of the second power value and the first threshold. If the co-control master station determines that the second power value is not less than the first threshold, the co-control master station sends a first power adjustment command to the N co-control substations located in the second regional power grid in the DC transmission system between the second regional power grid and M regional power grids to proportionally adjust the power of the N converter stations. The power adjustment device executes the first power adjustment command received by the N co-control substations to increase the allocated power supplied to the second regional power grid. Among them, the M regional power grids do not include the first regional power grid, and M≥1, N≥1. The sum of the proportionally adjusted power of the N converter stations is a third power value, and the third power value is not greater than the second power value.

[0017] and / or

[0018] When the first stabilization and control device of the first regional power grid issues a power reduction command, the first power control device of the first regional power grid adjusts the power of the first converter station within the first regional power grid to a fourth power value, and the second power control device of the second regional power grid adjusts the power of the second converter station accordingly to a fifth power value. The second power control device sends the fifth power value to the co-control master station through the first co-control substation. The co-control master station judges the magnitude of the fifth power value and the second threshold. If the co-control master station judges that the fifth power value is not less than the second threshold, the co-control master station sends a second power adjustment command to the N co-control substations located in the second regional power grid in the DC transmission system between the second regional power grid and M regional power grids to adjust the power of the N converter stations proportionally. The power adjustment device executes the second power adjustment command received by the N co-control substations to reduce the allocated power supplied to the second regional power grid. Among them, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is the sixth power value, and the sixth power value is not greater than the fifth power value.

[0019] According to some embodiments of this application, the DC transmission system is a double-ended DC transmission system. In the two converter stations of the double-ended DC transmission system, one is in rectification mode and the other is in inverter mode.

[0020] According to some embodiments of this application, the power loss value includes the DC transmission line loss power value, grounding electrode line loss power, and converter loss power that change after the power of the two-terminal DC transmission system is adjusted; if the first converter station is in rectification mode and the second converter station is in inverter mode, then the second power value is the difference between the first power value and the power loss value, or the fifth power value is the difference between the fourth power value and the power loss value; if the first converter station is in inverter mode and the second converter station is in rectification mode, then the second power value is the sum of the first power value and the power loss value, or the fifth power value is the sum of the fourth power value and the power loss value.

[0021] According to some embodiments of this application, the DC transmission system is a multi-terminal DC transmission system;

[0022] In a converter station of a multi-terminal DC transmission system, at least one is in rectification mode and at least one is in inverter mode.

[0023] According to some embodiments of this application, the power loss value includes the DC transmission line loss power value, grounding electrode line loss power, and converter loss power that change after the power of the multi-terminal DC transmission system is adjusted; if the first converter station is in rectification mode and the second converter station is in inverter mode, the second power value is the product of the difference between the first power value and the power loss value and the first coefficient, or the fifth power value is the product of the difference between the fourth power value and the power loss value and the first coefficient; if the first converter station is in inverter mode and the second converter station is in rectification mode, the second power value is the product of the sum of the first power value and the power loss value and the second coefficient, or the fifth power value is the product of the sum of the first power value and the power loss value and the second coefficient.

[0024] According to another aspect of this application, a power system is provided, including a power system DC transmission power coordination control system as described above.

[0025] According to another aspect of this application, a non-volatile computer-readable storage medium is provided, on which a computer program is stored, the computer program enabling a power system DC transmission power coordination control system to implement the power system DC transmission power coordination control method described above.

[0026] According to another aspect of this application, a power system DC transmission power coordination control device is provided, comprising: one or more processors; a storage device for storing one or more programs; when the one or more programs are executed by the one or more processors, the one or more processors implement the power system DC transmission power coordination control method as described above.

[0027] The technical solution provided in this application offers a method for coordinated control of DC transmission power in a power system, which provides corresponding power regulation to the supporting regional power grid connected to a power system when a fault occurs in a certain area of ​​the power grid.

[0028] When the regulating power provided by the supporting regional power grid exceeds its own capacity, the regional power grid connected to the supporting regional power grid also adjusts its power proportionally to share the power fluctuations of the supporting regional power grid. This allows for power regulation of the faulty regional power grid while ensuring the safety and stability of the supporting regional power grid, thereby ensuring the safe and stable normal operation of the entire power system. Attached Figure Description

[0029] To more clearly illustrate the technical solutions in the embodiments of this application, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0030] Figure 1 A schematic diagram 1000 of the structure of an electric system according to an example embodiment is shown;

[0031] Figure 2 A flowchart 2000 illustrates a power system DC transmission power coordination control method according to an example embodiment;

[0032] Figure 3 A flowchart 3000 is shown for another power system DC transmission power coordination control method according to an example embodiment;

[0033] Figure 4 A schematic diagram 4000 of the structure of a power system DC transmission power coordination control system according to an example embodiment is shown.

[0034] Explanation of reference numerals in the attached figures:

[0035] Power system DC transmission power coordination control system 1; coordinating control master station 10; first coordinating control substation 11; second coordinating control substation 12; third coordinating control substation 13.

[0036] First regional power grid G1; Second regional power grid G2; Third regional power grid G3; Fourth regional power grid G4.

[0037] First converter station S1; Second converter station S2; Third converter station S3; Fourth converter station S4; Fifth converter station S5; Sixth converter station S6.

[0038] First DC transmission system H1; Second DC transmission system H2; Third DC transmission system H3.

[0039] First stabilization device M1; second stabilization device M2; third stabilization device M3; fourth stabilization device M4.

[0040] First power control device N1; second power control device N2; third power control device N3; fourth power control device N4; fifth power control device N5; sixth power control device N6. Detailed Implementation

[0041] Exemplary embodiments will now be described more fully with reference to the accompanying drawings. However, these exemplary embodiments can be implemented in many forms and should not be construed as limited to the embodiments set forth herein; rather, they are provided so that this application will be thorough and complete, and will fully convey the concept of the exemplary embodiments to those skilled in the art. The same reference numerals in the drawings denote the same or similar parts, and therefore repeated descriptions of them will be omitted.

[0042] The described features, structures, or characteristics can be combined in any suitable manner in one or more embodiments. Numerous specific details are provided in the following description to give a full understanding of embodiments of this disclosure. However, those skilled in the art will recognize that the technical solutions of this disclosure can be practiced without one or more of these specific details, or other methods, components, materials, devices, etc. In these cases, well-known structures, methods, devices, implementations, materials, or operations will not be shown or described in detail.

[0043] Furthermore, the terms “comprising” and “having”, and any variations thereof, are intended to cover non-exclusive inclusion. For example, a process, method, system, product, or apparatus that includes a series of steps or units is not limited to the steps or units listed, but may optionally include steps or units not listed, or may optionally include other steps or units inherent to such process, method, product, or apparatus.

[0044] The terms "first," "second," etc., used in the specification, claims, and accompanying drawings of this application are used to distinguish different objects, rather than to describe a specific order.

[0045] The technical solutions of this application will be clearly and completely described below with reference to the accompanying drawings of the embodiments. Obviously, the described embodiments are only some, not all, of the embodiments of this application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without creative effort are within the scope of protection of this application.

[0046] According to one aspect of this application, a method for coordinated control of DC transmission power in a power system is provided.

[0047] According to an example embodiment, the power system includes at least three regional power grids, each regional power grid including a stabilization and control device and at least one converter station, the converter station including a power control device. The regional power grids are interconnected, wholly or partially, via their respective converter stations using a DC transmission system.

[0048] The first converter station in the first regional power grid and the second converter station in the second regional power grid are interconnected through a DC transmission system to transmit electrical energy.

[0049] For example, Figure 1 A schematic diagram 1000 of the structure of a power system according to an example embodiment is shown.

[0050] according to Figure 1 As shown, the power system comprises four regional power grids.

[0051] The four regional power grids are G1 (Regional Grid 1), G2 (Regional Grid 2), G3 (Regional Grid 3), and G4 (Regional Grid 4). Each regional power grid is an independent power grid divided according to its geographical characteristics.

[0052] Each regional power grid includes at least one converter station.

[0053] For example, the first regional power grid G1 includes the first converter station S1; the second regional power grid G2 includes the second converter station S2, the third converter station S3 and the fifth converter station S5; the third regional power grid G3 includes the fourth converter station S4; and the fourth regional power grid G4 includes the sixth converter station S6.

[0054] Each regional power grid includes at least one stabilization device.

[0055] For example, according to Figure 1 As shown, the first regional power grid G1 includes a first stabilization device M1; the second regional power grid G2 includes a second stabilization device M2; the third regional power grid G3 includes a third stabilization device M3; and the fourth regional power grid G4 includes a fourth stabilization device M4.

[0056] Each converter station includes at least one power control device.

[0057] For example, according to Figure 1 As shown, the first converter station S1 of the first regional power grid G1 includes a first power control device N1; the second converter station S2 of the second regional power grid G2 includes a second power control device N2, the third converter station S3 includes a third power control device N3, and the fifth converter station S5 includes a fifth power control device N5; the fourth converter station S4 of the third regional power grid G3 includes a fourth power control device N4; and the sixth converter station S6 of the fourth regional power grid G4 includes a sixth power control device N6.

[0058] The power grid stability control device is used to monitor the operating status of the power grid in its area in real time. When a fault occurs in the power grid area where a stability control device is located, the device sends a power increase command or a power decrease command to the power control device of the power grid in that area, depending on the fault type. The power control device then adjusts the power of the converter stations in the power grid according to the power increase or power decrease command to maintain the safe and stable operation of the power grid.

[0059] Regional power grids are interconnected, in whole or in part, via their own converter stations using DC transmission systems. DC transmission systems include, but are not limited to, thyristor-based high-voltage DC transmission systems, fully controlled flexible DC transmission systems, or hybrid DC transmission systems.

[0060] For example, the first regional power grid G1 and the second regional power grid G2 are connected through the first DC transmission system H1, which includes the first converter station S1, the second converter station S2, and DC transmission lines.

[0061] The second regional power grid G2 and the third regional power grid G3 are connected through the second DC transmission system H2, which includes the third converter station S3, the fourth converter station S4, and DC transmission lines.

[0062] The second regional power grid G2 and the fourth regional power grid G4 are connected through the third DC transmission system H3, which includes the fifth converter station S5, the sixth converter station S6, and DC transmission lines.

[0063] The following text will be based on Figure 1 The power system shown is an example embodiment to describe in detail the DC transmission power coordination control method for the power system provided in this application.

[0064] Figure 2 A flowchart 2000 illustrates a power system DC transmission power coordination control method according to an example embodiment.

[0065] according to Figure 2 As shown, the DC transmission power coordination control method 2000 for power systems includes steps S210 to S250.

[0066] In step S210, the first stabilization device M1 of the first regional power grid G1 issues a power boosting command for the first regional power grid G1, and then the first power control device N1 of the first regional power grid G1 adjusts the power of the first converter station S1 in the first regional power grid G1 to a first power value.

[0067] The second power control device N2 in the second regional power grid G2 adjusts the power of the second converter station S2 accordingly to increase the dispatch power supplied to the first regional power grid G1.

[0068] It should be noted that the first power control device N1 and the second power control device N2 coordinate with each other to control the power of the first DC transmission system H1, thereby achieving the aforementioned power regulation. The first power control device N1 and the second power control device N2 can exchange power information through inter-station communication.

[0069] Optionally, the DC transmission system can be a double-ended DC transmission system, in which one of the two converter stations is in rectification mode and the other is in inverter mode.

[0070] For example, a first regional power grid G1 and a second regional power grid G2 are connected via a double-ended DC transmission system. The double-ended DC transmission system is connected through two converter stations (e.g., a first converter station S1 and a second converter station S2). Specifically, the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, or the first converter station S1 is in inverter mode and the second converter station S2 is in rectification mode.

[0071] The rectification state of a converter station refers to its operation in converting alternating current (AC) to direct current (DC) output; the inverter state refers to its operation in converting DC to AC output. Depending on the actual needs of the regional power grid, the converter station can operate in either rectification or inverter mode.

[0072] According to the example embodiment, if the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, when the first stabilization control device M1 of the first regional power grid G1 issues a power increase command for the first regional power grid G1, the first power control device N1 reduces the power of the first converter station S1 by a first power value, and the second power control device N2 correspondingly reduces the power of the second converter station S2 by a second power value, so as to increase the dispatch power supplied to the first regional power grid G1.

[0073] If the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, when the first stabilization control device M1 of the first regional power grid G1 issues a power increase command for the first regional power grid G1, the first power control device N1 increases the power of the first converter station S1 by a first power value, and the second power control device N2 correspondingly increases the power of the second converter station S2 by a second power value, so as to increase the dispatch power supplied to the first regional power grid G1.

[0074] According to the example embodiment, in step S210, when an emergency fault occurs in the first regional power grid G1, causing a sudden drop in the power generation capacity of the first regional power grid (e.g., a generator providing power generation within the first regional power grid G1 fails, resulting in a sharp decrease in the power generation source), the first regional power grid G1 requires power support from an external regional power grid connected to it (e.g., a second regional power grid). This can reduce power fluctuations in the first regional power grid G1, thereby maintaining the power balance of the first regional power grid.

[0075] The first stability control device M1 in the first regional power grid G1 monitors the fault type of the first regional power grid G1 and learns that the first regional power grid G1 needs power support. Then, the first stability control device M1 issues a power boost command to the first power control device N1 of the first converter station S1, and the first power control device N1 adjusts the power of the first converter station S1 in the first regional power grid G1 to a first power value.

[0076] In step S210, the second power control device N2 adjusts the power of the second converter station S2 within the second regional power grid G2 to a second power value, thereby increasing the dispatched power supplied by the second regional power grid G2 to the first regional power grid G1, i.e., providing power support. This compensates for power fluctuations in the first regional power grid G1 caused by faults, thus ensuring the safe and stable operation of the first regional power grid G1.

[0077] In step S230, the magnitude of the second power value and the first threshold value are determined.

[0078] In step S250, the power of N converter stations located in the second regional power grid G2 in the DC transmission system between the second regional power grid G2 and M regional power grids is proportionally adjusted to increase the dispatch power supplied to the second regional power grid G2.

[0079] Among them, the M regional power grids do not include the first regional power grid G1, and M≥1, N≥1. The sum of the proportionally adjusted power of the N converter stations is the third power value, and the third power value is not greater than the second power value.

[0080] The value of the third power value must be determined so that the second regional power grid G2 can withstand power fluctuations equal to the difference between the second and third power values. The third power value is determined through theoretical analysis, simulation testing, or experiments.

[0081] For example, in step S230, the second regional power grid G2 determines the magnitude of the second power value and the first threshold. The first threshold is a preset power value.

[0082] The value of the first threshold can be 0.01 to 1.2 times the rated power of the first DC transmission system H1. The first threshold is set by theoretical analysis, simulation test or experiment based on the power capacity that the second regional power grid G2 can bear.

[0083] If, in step S230, it is determined that the second power value is greater than the first threshold, it means that the second power value regulated by the second converter station S2 exceeds the power regulation range that the second converter station S2 can withstand. Then, in step S250, the power of the second DC transmission system H2 and the third DC transmission system H3 between the second regional power grid G2 and the third regional power grid G3 and the fourth regional power grid G4, located at the third converter station S3 and the fifth converter station S5 in the second regional power grid G2, is proportionally adjusted. The power of the fourth converter station S4 and the sixth converter station S6 is adjusted accordingly. The power regulated by the second regional power grid G2 is then transmitted to the third regional power grid G3 and the fourth regional power grid G4 through the second DC transmission system H2 and the third DC transmission system H3, thereby increasing the dispatched power supplied to the second regional power grid G2.

[0084] In a specific embodiment, the power regulation ratio can be determined within the power regulation range that the other regional power grids can withstand, based on the short-circuit capacity and actual operating conditions of the other regional power grids connected to the second regional power grid G2.

[0085] For example, the first power is P1, the second power is P2, and the third power is P3. The power regulated by S3 of the third converter station is A1·P3, and the power regulated by S5 of the fifth converter station is A2·P3, where A1+A2=1.

[0086] The sum of the proportionally adjusted power of the third converter station S3 and the fifth converter station S5 constitutes the third power value. This third power value must not exceed the second power value to avoid the third converter station S3 and the fifth converter station S5 providing excessive support power to the second regional power grid G2. This prevents excessive power fluctuations in the third regional power grid G3 and the fourth regional power grid G4 from affecting their stable operation.

[0087] According to the example embodiment, if the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 reduces the power of the third converter station S3 by A1·P3, and the fourth power control device N4 reduces the power of the fourth converter station S4 accordingly to increase the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 reduces the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 reduces the power of the sixth converter station S6 accordingly to increase the dispatched power supplied to the second regional power grid G2.

[0088] If the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will reduce the power of the third converter station S3 by A1·P3, and the fourth power control device N4 will correspondingly reduce the power of the fourth converter station S4 to increase the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will increase the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 will correspondingly increase the power of the sixth converter station S6 to increase the dispatched power supplied to the second regional power grid G2.

[0089] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 will increase the power of the third converter station S3 by A1·P3, and the fourth power control device N4 will correspondingly increase the power of the fourth converter station S4 to increase the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will decrease the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 will correspondingly decrease the power of the sixth converter station S6 to increase the dispatched power supplied to the second regional power grid G2.

[0090] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will increase the power of the third converter station S3 by A1·P3, and the fourth power control device N4 will correspondingly increase the power of the fourth converter station S4 to increase the dispatched power supplied to the second regional power grid G2. Similarly, the fifth power control device N5 will increase the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 will correspondingly increase the power of the sixth converter station S6 to increase the dispatched power supplied to the second regional power grid G2.

[0091] According to the above embodiment, when the first regional power grid G1 experiences a fault and adjusts the power of the first converter station S1 to a first power value, the power of the second converter station S2 of the second regional power grid G2 is also adjusted to a second power value to increase the dispatched power supplied to the first regional power grid G1, that is, to provide power support.

[0092] When the supporting power provided by the second regional power grid G2 exceeds the power limit that the second regional power grid G2 can bear, other converter stations connected to the second regional power grid G2 will adjust their power proportionally to increase the dispatched power supplied to the second regional power grid G2, so that multiple regional power grids can share the power fluctuations caused by the failure of the first regional power grid G1.

[0093] This prevents excessive power fluctuations in the second regional power grid G2 from affecting its stable operation. Therefore, while ensuring the stable operation of the second regional power grid G2, power support can be provided to the first regional power grid G1, which has experienced a fault, thus guaranteeing the safe and stable operation of the first regional power grid G1.

[0094] Figure 3 A flowchart 3000 illustrates another power system DC transmission power coordination control method according to an example embodiment.

[0095] according to Figure 3 As shown, another power system DC transmission power coordination control method 3000 includes steps S310 to S350.

[0096] In step S310, the first stabilization device M1 of the first regional power grid G1 issues a power reduction command for the first regional power grid G1, and then the first power control device N1 of the first regional power grid G1 adjusts the power of the first converter station S1 in the first regional power grid G1 to a fourth power value.

[0097] The second power control device N2 in the second regional power grid G2 adjusts the power of the second converter station S2 accordingly to the fifth power value, so as to reduce the dispatch power supplied to the first regional power grid G1.

[0098] It should be noted that the first power control device N1 and the second power control device N2 coordinate with each other to control the power of the first DC transmission system H1, thereby achieving the aforementioned power regulation. The first power control device N1 and the second power control device N2 can exchange power information through inter-station communication.

[0099] According to the example embodiment, if the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, when the first stabilization device M1 of the first regional power grid G1 issues a power reduction command for the first regional power grid G1, the first power control device N1 increases the power of the first converter station S1 by a fourth power value, and the second power control device N2 correspondingly increases the power of the second converter station S2 by a fifth power value, so as to reduce the dispatch power supplied to the first regional power grid G1.

[0100] If the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, when the first stabilization control device M1 of the first regional power grid G1 issues a power reduction command for the first regional power grid G1, the first power control device N1 will reduce the power of the first converter station S1 by the fourth power value, and the second power control device N2 will correspondingly reduce the power of the second converter station S2 by the fifth power value, so as to reduce the dispatch power supplied to the first regional power grid G1.

[0101] For example, in step S310, when an emergency fault occurs in the first regional power grid G1, causing a sharp drop in its power consumption (e.g., a large-scale power outage occurs in a factory with high power consumption within the first regional power grid G1), or when the AC lines of the first regional power grid G1 are overloaded (e.g., the AC lines of the first regional power grid G1 near the first converter station trip), the first regional power grid G1 needs to reduce the power generation transmission from the external regional power grid connected to it (e.g., the second regional power grid). This prevents the first regional power grid G1 from generating excessive power and creating a large power surplus, which could lead to an increase in the frequency of the first regional power grid G1 and affect its safe and stable operation.

[0102] The first stabilization and control device M1 in the first regional power grid G1 detects a fault in the first regional power grid G1 and learns that the first regional power grid G1 needs to reduce the external power generation to avoid power overload at the power consumption end within the first regional power grid G1. The first stabilization and control device M1 issues a power reduction command to the first power control device N1 of the first converter station S1. The first power control device N1 adjusts the power of the first converter station S1 within the first regional power grid G1 to a fourth power value.

[0103] In step S310, the second power control device N2 adjusts the power of the second converter station S2 within the second regional power grid G2 to a fifth power value, thereby reducing the dispatched power supplied by the second converter station S2 to the first converter station S1, i.e., reducing the transmitted power generation. This prevents the power generation of the first regional power grid G1 from being excessively high, thus ensuring the safe and stable operation of the first regional power grid G1.

[0104] In step S330, the magnitude of the fifth power value and the second threshold are determined.

[0105] In step S350, the power of N converter stations located in the second regional power grid G2 in the DC transmission system between the second regional power grid G2 and M regional power grids is proportionally adjusted to reduce the dispatched power supplied to the second regional power grid G2.

[0106] Among them, the M regional power grids do not include the first regional power grid G1, and M≥1, N≥1. The sum of the proportionally adjusted power of the N converter stations is the sixth power value, and the sixth power value is not greater than the fifth power value.

[0107] The sixth power value must be determined in a way that allows the second regional power grid G2 to withstand power fluctuations equal to the difference between the fifth and sixth power values. The sixth power value is determined through theoretical analysis, simulation testing, or experimentation.

[0108] For example, in step S330, the second regional power grid G2 determines the magnitude of the fifth power value regulated by the second converter station S2 and the second threshold value. The second threshold value is a preset power value.

[0109] The value of the second threshold can be 0.01 to 1.2 times the rated power of the first DC transmission system H1. The second threshold is set by theoretical analysis, simulation test or experiment based on the power capacity that the second regional power grid G2 can bear.

[0110] If, in step S330, it is determined that the fifth power value is greater than the second threshold, it means that the fifth power value regulated by the second converter station S2 exceeds the power regulation range that the second converter station S2 can withstand. Then, in step S350, the power of the second DC transmission system H2 and the third DC transmission system H3 between the second regional power grid G2 and the third regional power grid G3 and the fourth regional power grid G4, located at the third converter station S3 and the fifth converter station S5 in the second regional power grid G2, is proportionally adjusted, and the power of the fourth converter station S4 and the sixth converter station S6 is adjusted accordingly. The power regulated by the second regional power grid G2 is then transmitted to the third regional power grid G3 and the fourth regional power grid G4 through the second DC transmission system H2 and the third DC transmission system H3, thereby reducing the dispatched power supplied to the second regional power grid G2.

[0111] In a specific embodiment, the power regulation ratio can be determined within the power regulation range that the other regional power grids can withstand, based on the short-circuit capacity and actual operating conditions of the other regional power grids connected to the second regional power grid G2.

[0112] For example, the fourth power is P4, the fifth power is P5, and the sixth power is P6. The power regulated by S3 of the third converter station is B1·P6, and the power regulated by S5 of the fifth converter station is B2·P6, where B1+B2=1.

[0113] The sum of the proportionally adjusted power of the third converter station S3 and the fifth converter station S5 is the sixth power value. The sixth power value must not exceed the fifth power value to avoid the third converter station S3 and the fifth converter station S5 absorbing excessive support power from the second regional power grid G2. This prevents excessive power fluctuations in the third regional power grid G3 and the fourth regional power grid G4 from affecting their stable operation.

[0114] According to the example embodiment, if the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 increases the power of the third converter station S3 by B1·P6, and the fourth power control device N4 correspondingly increases the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. Similarly, the fifth power control device N5 increases the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 correspondingly increases the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0115] If the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will increase the power of the third converter station S3 by B1·P6, and the fourth power control device N4 will correspondingly increase the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will decrease the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 will correspondingly decrease the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0116] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 will reduce the power of the third converter station S3 by B1·P6, and the fourth power control device N4 will correspondingly reduce the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will increase the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 will correspondingly increase the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0117] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will reduce the power of the third converter station S3 by B1·P6, and the fourth power control device N4 will correspondingly reduce the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. Similarly, the fifth power control device N5 will reduce the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 will correspondingly reduce the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0118] According to the above embodiment, when the first regional power grid G1 experiences a fault and adjusts the power of the first converter station S1 to a fourth power value, the power of the second converter station S2 of the second regional power grid G2 is also adjusted to a fifth power value, so as to reduce the dispatched power supplied to the first converter station S1.

[0119] When the power regulated by the second regional power grid G2 exceeds its acceptable power capacity, the power of other converter stations connected to the second regional power grid G2 will be proportionally adjusted to a sixth power value to share the excess power of the second regional power grid G2 and prevent excessive power fluctuations from affecting its stable operation. This allows for power allocation to the first regional power grid G1, which is experiencing a fault, while ensuring the stable operation of the second regional power grid G2, thus guaranteeing the safe and stable operation of the first regional power grid G1.

[0120] Optionally, if when the DC transmission system is a two-terminal DC transmission system, and the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, the second power value is the difference between the first power value and the power loss value, or the fifth power value is the difference between the fourth power value and the power loss value.

[0121] The power loss value includes the power loss of the DC transmission lines, the power loss of the grounding electrode line, and the power loss of the converter, all of which change after the power of the two-terminal DC transmission system is adjusted. The power loss value equals the power difference between the rectifier station and the inverter station of the two-terminal DC transmission system after power adjustment, minus the power difference before power adjustment. When the power of the two-terminal DC transmission system increases, the power loss value is positive; when the power of the two-terminal DC transmission system decreases, the power loss value is negative.

[0122] If the DC transmission system is a two-terminal DC transmission system, and the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, the second power value is the sum of the first power value and the power loss value, or the fifth power value is the sum of the fourth power value and the power loss value.

[0123] For example, the first power value is P1, the second power value is P2, the fourth power value is P4, the fifth power value is P5, and the power loss value is PL.

[0124] When the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, that is, the first regional power grid G1 is the power transmitting end and the second regional power grid G2 is the power receiving end. When the first regional power grid G1 transmits power to the second regional power grid G2, power loss will occur on the DC transmission line, i.e., power loss value PL. Therefore, P2 = P1 - PL, or P5 = P4 - PL.

[0125] When the first converter station S1 is in inverter mode and the second converter station S2 is in rectification mode, that is, the first regional power grid G1 is the receiving end and the second regional power grid G2 is the transmitting end. When the second regional power grid G2 transmits power to the first regional power grid G1, power loss will occur on the DC transmission line, i.e., power loss value PL. Therefore, P2 = P1 + PL, or P5 = P4 + PL.

[0126] Optionally, the DC transmission system can be a multi-terminal DC transmission system. In the converter stations of the multi-terminal DC transmission system, at least one is in rectification mode and at least one is in inverter mode.

[0127] For example, the first regional power grid G1 and the second regional power grid G2 are connected via a multi-terminal DC transmission system. The multi-terminal DC transmission system is connected through at least three converter stations (e.g., the first converter station S1, the second converter station S2, and other converter stations).

[0128] Among at least three converter stations, the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, or the first converter station S1 is in inverter mode and the second converter station S2 is in rectification mode.

[0129] Optionally, if when the DC transmission system is a multi-terminal DC transmission system, and the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, the second power value is the product of the difference between the first power value and the power loss value and the first coefficient, or the fifth power value is the product of the difference between the fourth power value and the power loss value and the first coefficient.

[0130] For example, the first power value is P1, the second power value is P2, the fourth power value is P4, the fifth power value is P5, the power loss value is PL, and the first coefficient is K1.

[0131] When the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, that is, the first regional power grid G1 is the power transmitting end and the second regional power grid G2 is the power receiving end, then P2 = K1·(P1-PL) or P5 = K1·(P4-PL).

[0132] Optionally, if when the DC transmission system is a multi-terminal DC transmission system, and the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, the second power value is the product of the sum of the first power value and the power loss value and the second coefficient, or the fifth power value is the product of the sum of the fourth power value and the power loss value and the second coefficient.

[0133] For example, the first power value is P1, the second power value is P2, the fourth power value is P4, the fifth power value is P5, the power loss value is PL, and the second coefficient is K2.

[0134] When the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, that is, the first regional power grid G1 is the power receiving end and the second regional power grid G2 is the power receiving end, then P2=K2·(P1+PL) or P5=K2·(P1+PL).

[0135] According to the example embodiment, the first coefficient and the second coefficient are determined through theoretical analysis, simulation, or experimentation based on the short-circuit capacity of the second regional power grid G2 and other regional power grids. The larger the short-circuit capacity of the second regional power grid G2, the larger the first coefficient and the second coefficient, where K1≤1 and K2≤1.

[0136] According to another aspect of this application, a power system DC transmission power coordination control system is provided.

[0137] The power system described in the power system DC transmission power coordination control system provided in this application can be... Figure 1The power system shown is described in detail, therefore its structure and connections will not be described in detail here.

[0138] Figure 4 A schematic diagram 4000 of the structure of a power system DC transmission power coordination control system according to an example embodiment is shown.

[0139] according to Figure 4 As shown, the DC transmission power coordination control system 1 of the power system includes a master control station 10, a first coordination control substation 11, and N coordination control substations.

[0140] For example, N co-control substations include the second co-control substation 12 and the third co-control substation 13.

[0141] The coordinating master station 10 is used to coordinate and allocate the power of converter stations in the regional power grid and send power adjustment commands.

[0142] The first coordinating substation 11 sends the power regulation value of the second converter station S2 of the second regional power grid G2 to the coordinating master station 10.

[0143] N co-control substations receive power adjustment commands sent by the co-control master station 10 and send the power adjustment commands to the power control device. The N co-control substations are configured in N converter stations respectively.

[0144] According to an example embodiment, the first converter station S1 included in the first regional power grid G1 and the second converter station S2 included in the second regional power grid G2 are interconnected through a DC transmission system H1.

[0145] If the first stabilization device M1 of the first regional power grid G1 issues a power boosting command for the first regional power grid G1, then the first power control device N1 will adjust the power of the first converter station S1 in the first regional power grid G1 to a first power value.

[0146] The second power control device N2 in the second regional power grid G2 adjusts the power of the second converter station S2 accordingly to increase the dispatch power supplied to the first regional power grid G1.

[0147] It should be noted that the first power control device N1 and the second power control device N2 coordinate with each other to control the power of the first DC transmission system H1, thereby achieving the aforementioned power regulation. The first power control device N1 and the second power control device N2 can exchange power information through inter-station communication.

[0148] Optionally, the DC transmission system can be a double-ended DC transmission system, in which one of the two converter stations is in rectification mode and the other is in inverter mode.

[0149] For example, a first regional power grid G1 and a second regional power grid G2 are connected via a double-ended DC transmission system. The double-ended DC transmission system is connected through two converter stations (e.g., a first converter station S1 and a second converter station S2). Specifically, the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, or the first converter station S1 is in inverter mode and the second converter station S2 is in rectification mode.

[0150] The rectification state of a converter station refers to its operation in converting alternating current (AC) to direct current (DC) output; the inverter state refers to its operation in converting DC to AC output. Depending on the actual needs of the regional power grid, the converter station can operate in either rectification or inverter mode.

[0151] According to the example embodiment, if the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, when the first stabilization control device M1 of the first regional power grid G1 issues a power increase command for the first regional power grid G1, the first power control device N1 reduces the power of the first converter station S1 by a first power value, and the second power control device N2 correspondingly reduces the power of the second converter station S2 by a second power value, so as to increase the dispatch power supplied to the first regional power grid G1.

[0152] If the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, when the first stabilization control device M1 of the first regional power grid G1 issues a power increase command for the first regional power grid G1, the first power control device N1 increases the power of the first converter station S1 by a first power value, and the second power control device N2 correspondingly increases the power of the second converter station S2 by a second power value, so as to increase the dispatch power supplied to the first regional power grid G1.

[0153] For example, when an emergency fault occurs in the first regional power grid G1, causing a sharp drop in its power generation (e.g., a generator within the first regional power grid G1 fails, resulting in a sudden decrease in power generation sources), the first regional power grid G1 requires power support from an external regional power grid connected to it (e.g., the second regional power grid). This allows the support power provided by other connected regional power grids to reduce power fluctuations in the first regional power grid G1, thereby maintaining its power balance.

[0154] The first stability control device M1 in the first regional power grid G1 monitors the fault type of the first regional power grid G1 and learns that the first regional power grid G1 needs power support. Then, the first stability control device M1 issues a power boost command to the first power control device N1 of the first converter station S1, and the first power control device N1 adjusts the power of the first converter station S1 in the first regional power grid G1 to a first power value.

[0155] The second power control device N2 accordingly adjusts the power of the second converter station S2 within the second regional power grid G2 to a second power value, thereby increasing the dispatched power supplied by the second converter station S2 to the first converter station S1, i.e., providing power support to the first regional power grid G1. This can compensate for power fluctuations in the first regional power grid G1, thus ensuring the safe and stable operation of the first regional power grid G1.

[0156] The second power control device N2 sends the second power value to the co-control master station 10 through the first co-control substation 11.

[0157] The co-control master station 10 determines the magnitude of the second power value and the first threshold.

[0158] If the co-control master station 10 determines that the second power value is not less than the first threshold, then the co-control master station 10 sends a first power adjustment command to the N co-control substations located in the second regional power grid G2 and the M regional power grids in the DC transmission system between the second regional power grid G2 and the M regional power grids. The power of the N converter stations is adjusted proportionally. The power adjustment device executes the first power adjustment command received by the N co-control substations to increase the dispatch power supplied to the second regional power grid G2.

[0159] Among them, the M regional power grids do not include the first regional power grid G1, and M≥1, N≥1. The sum of the proportionally adjusted power of the N converter stations is the third power value, and the third power value is not greater than the second power value.

[0160] The value of the third power value must be determined so that the second regional power grid G2 can withstand power fluctuations equal to the difference between the second and third power values. The third power value is determined through theoretical analysis, simulation testing, or experiments.

[0161] The first power adjustment command issued by the co-control master station 10 may include:

[0162] The co-control master station 10 calculates the third power value of the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and M regional power grids, and calculates the adjustment power value allocated to each of the N converter stations in the second regional power grid G2. Based on the adjustment power value, it sends a first power adjustment command to the power control device of each converter station to perform power adjustment accordingly.

[0163] For example, the co-control master station 10 determines the magnitude of the second power value and the first threshold value for the second regional power grid G2 regulation.

[0164] The first threshold is a preset power value. The value of the first threshold can be 0.01 to 1.2 times the rated power of the first DC transmission system H1. The setting of the first threshold is obtained through theoretical analysis, simulation test or experiment based on the power capacity that the second regional power grid G2 can bear.

[0165] If the co-control master station 10 determines that the second power value is greater than the first threshold, it means that the second power value regulated by the second regional power grid G2 has exceeded or is about to exceed the power regulation range that the second regional power grid G2 can withstand.

[0166] Then, the master control station 10 sends a first power adjustment command to the second control substation 12 and the third control substation 13. The third power control device N3 receives the first power adjustment command from the second control substation 12 and performs power adjustment. The fifth power control device N5 receives the first power adjustment command from the third control substation 13 and performs power adjustment.

[0167] The third power control device N3 and the fifth power control device N4 respectively adjust the power of the third converter station S3 and the fifth converter station S5.

[0168] The power of the fourth converter station S4 and the sixth converter station S6 is adjusted accordingly, and the power adjusted by the second regional power grid G2 is transmitted to the third regional power grid G3 and the fourth regional power grid G4 through the second DC transmission system H2 and the third DC transmission system H3, so as to increase the dispatch power supplied to the second regional power grid G2.

[0169] In a specific embodiment, the power regulation ratio can be determined within the power regulation range that the other regional power grids can withstand, based on the short-circuit capacity and actual operating conditions of the other regional power grids connected to the second regional power grid G2.

[0170] For example, the first power is P1, the second power is P2, and the third power is P3. The power regulated by S3 of the third converter station is A1·P3, and the power regulated by S5 of the fifth converter station is A2·P3, where A1+A2=1.

[0171] The sum of the proportionally adjusted power of the third converter station S3 and the fifth converter station S5 constitutes the third power value. This third power value must not exceed the second power value to avoid the third converter station S3 and the fifth converter station S5 providing excessive support power to the second regional power grid G2. This prevents excessive power fluctuations in the third regional power grid G3 and the fourth regional power grid G4 from affecting their stable operation.

[0172] According to the example embodiment, if the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 reduces the power of the third converter station S3 by A1·P3, and the fourth power control device N4 reduces the power of the fourth converter station S4 accordingly to increase the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 reduces the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 reduces the power of the sixth converter station S6 accordingly to increase the dispatched power supplied to the second regional power grid G2.

[0173] If the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will reduce the power of the third converter station S3 by A1·P3, and the fourth power control device N4 will correspondingly reduce the power of the fourth converter station S4 to increase the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will increase the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 will correspondingly increase the power of the sixth converter station S6 to increase the dispatched power supplied to the second regional power grid G2.

[0174] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 will increase the power of the third converter station S3 by A1·P3, and the fourth power control device N4 will correspondingly increase the power of the fourth converter station S4 to increase the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will decrease the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 will correspondingly decrease the power of the sixth converter station S6 to increase the dispatched power supplied to the second regional power grid G2.

[0175] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will increase the power of the third converter station S3 by A1·P3, and the fourth power control device N4 will correspondingly increase the power of the fourth converter station S4 to increase the dispatched power supplied to the second regional power grid G2. Similarly, the fifth power control device N5 will increase the power of the fifth converter station S5 by A2·P3, and the sixth power control device N6 will correspondingly increase the power of the sixth converter station S6 to increase the dispatched power supplied to the second regional power grid G2.

[0176] According to the above embodiment, when a fault occurs in the first regional power grid G1 and the power of the first converter station S1 is adjusted to a first power value, the power of the second converter station S2 in the second regional power grid G2 is also adjusted to a second power value to increase the dispatched power supplied to the first converter station S1, that is, to provide power support.

[0177] When the supporting power provided by the second regional power grid G2 exceeds the power limit that the second regional power grid G2 can bear, other converter stations connected to the second regional power grid G2 will adjust their power proportionally to increase the dispatched power supplied to the second regional power grid G2, so that multiple regional power grids can share the power fluctuations caused by the failure of the first regional power grid G1.

[0178] This prevents excessive power fluctuations in the second regional power grid G2 from affecting its stable operation. Therefore, while ensuring the stable operation of the second regional power grid G2, power support can be provided to the first regional power grid G1, which has experienced a fault, thus guaranteeing the safe and stable operation of the first regional power grid G1.

[0179] According to the example embodiment, when the first stabilization device M1 of the first regional power grid G1 issues a power reduction command for the first regional power grid, the first power control device N1 adjusts the power of the first converter station S1 in the first regional power grid G1 to a fourth power value.

[0180] The second power control device N2 in the second regional power grid G2 adjusts the power of the second converter station S2 to a fifth power value to reduce the dispatched power supplied to the first regional power grid G1.

[0181] It should be noted that the first power control device N1 and the second power control device N2 coordinate with each other to control the power of the first DC transmission system H1, thereby achieving the aforementioned power regulation. The first power control device N1 and the second power control device N2 can exchange power information through inter-station communication.

[0182] According to the example embodiment, if the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, when the first stabilization device M1 of the first regional power grid G1 issues a power reduction command for the first regional power grid G1, the first power control device N1 increases the power of the first converter station S1 by a fourth power value, and the second power control device N2 correspondingly increases the power of the second converter station S2 by a fifth power value, so as to reduce the dispatch power supplied to the first regional power grid G1.

[0183] If the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, when the first stabilization control device M1 of the first regional power grid G1 issues a power reduction command for the first regional power grid G1, the first power control device N1 will reduce the power of the first converter station S1 by the fourth power value, and the second power control device N2 will correspondingly reduce the power of the second converter station S2 by the fifth power value, so as to reduce the dispatch power supplied to the first regional power grid G1.

[0184] For example, when an emergency fault occurs in the first regional power grid G1, causing a sharp drop in its power consumption (e.g., a large-scale power outage at a factory with high power consumption within the first regional power grid G1), or when the AC lines of the first regional power grid G1 experience overload (e.g., an AC line near the first converter station S1 trips), the first regional power grid G1 requires the external regional power grid connected to it (e.g., the second regional power grid) to reduce its power generation. This prevents the first regional power grid G1 from generating excessive power and creating a large power surplus, which could lead to an increase in the frequency of the first regional power grid G1 and affect its safe and stable operation.

[0185] The second power control device N2 sends the fifth power value to the co-control master station 10 through the first co-control substation 11.

[0186] The first stabilization and control device M1 in the first regional power grid G1 detects a fault in the first regional power grid G1 and learns that the first regional power grid G1 needs to reduce the external power generation to avoid power overload at the power consumption end within the first regional power grid G1. The first stabilization and control device M1 issues a power reduction command to the first power control device N1 of the first converter station S1. The first power control device N1 adjusts the power of the first converter station S1 within the first regional power grid G1 to a fourth power value.

[0187] The second power control device N2 adjusts the power of the second converter station S2 within the second regional power grid G2 according to the fifth power value, so that the second converter station S2 reduces the dispatched power supplied to the first converter station S1, that is, reduces the transmitted power generation. This can prevent the first regional power grid G1 from having excessive power generation, resulting in excessively high frequency at the power consumption end, thereby ensuring the safe and stable operation of the first regional power grid G1.

[0188] The co-control master station 10 determines the magnitude of the fifth power value and the second threshold.

[0189] If the co-control master station 10 determines that the fifth power value is not less than the second threshold, then the co-control master station 10 sends a second power adjustment command to the N co-control substations located in the N converter stations of the second regional power grid in the DC transmission system between the second regional power grid G2 and the M regional power grids. The power adjustment device executes the power adjustment command of the co-control substation 20 to reduce the dispatched power supplied to the second regional G2 power grid.

[0190] Among them, the M regional power grids do not include the first regional power grid G1, and M≥1, N≥1. The sum of the proportionally adjusted power of the N converter stations is the sixth power value, and the sixth power value is not greater than the fifth power value.

[0191] The sixth power value must be determined in a way that allows the second regional power grid G2 to withstand power fluctuations equal to the difference between the fifth and sixth power values. The sixth power value is determined through theoretical analysis, simulation testing, or experimentation.

[0192] The second power adjustment command issued by the co-control master station 10 may include:

[0193] The co-control master station 10 calculates the sixth power value proportionally adjusted by the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and M regional power grids, and calculates the adjustment power value allocated to each of the N converter stations in the second regional power grid G2. Based on the adjustment power value, it sends a second power adjustment command to the power control device of each converter station to perform power adjustment accordingly.

[0194] For example, the co-control master station 10 performs a judgment on the magnitude of the fifth power value and the second threshold for the regulation of the second regional power grid G2.

[0195] The second threshold is a preset power value. The value of the second threshold can be 0.01 to 1.2 times the rated power of the first DC transmission system H1. The setting of the second threshold is obtained through theoretical analysis, simulation test or experiment based on the power capacity that the second regional power grid G2 can bear.

[0196] If the co-control master station 10 determines that the fifth power value is greater than the second threshold, it means that the fifth power value regulated by the second regional power grid G2 has exceeded or is about to exceed the power regulation range that the second regional power grid G2 can withstand.

[0197] Then, the master control station 10 sends a second power adjustment command to the second control substation 12 and the third control substation 13. The third power control device N3 receives the second power adjustment command from the second control substation 12 and performs power adjustment. The fifth power control device N5 receives the second power adjustment command from the third control substation 13 and performs power adjustment.

[0198] The third power control device N3 and the fifth power control device N5 respectively adjust the power of the third converter station S3 and the fifth converter station S5. The fourth power control device N4 and the sixth power control device N6 adjust the power of the fourth converter station S4 and the sixth converter station S6 accordingly. The power regulated by the second regional power grid G2 is transmitted to the third regional power grid G3 and the fourth regional power grid G4 through the second DC transmission system H2 and the third DC transmission system H3, so as to reduce the dispatch power supplied to the second regional power grid G2.

[0199] In a specific embodiment, the power regulation ratio can be determined within the power regulation range that the other regional power grids can withstand, based on the short-circuit capacity and actual operating conditions of the other regional power grids connected to the second regional power grid G2.

[0200] For example, the fourth power is P4, the fifth power is P5, and the sixth power is P6. The power regulated by S3 of the third converter station is B1·P6, and the power regulated by S5 of the fifth converter station is B2·P6, where B1+B2=1.

[0201] The sum of the proportionally adjusted power of the third converter station S3 and the fifth converter station S5 is the sixth power value. The sixth power value must not exceed the fifth power value to avoid the third converter station S3 and the fifth converter station S5 absorbing excessive support power from the second regional power grid G2. This prevents excessive power fluctuations in the third regional power grid G3 and the fourth regional power grid G4 from affecting their stable operation.

[0202] According to the example embodiment, if the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 increases the power of the third converter station S3 by B1·P6, and the fourth power control device N4 correspondingly increases the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. Similarly, the fifth power control device N5 increases the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 correspondingly increases the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0203] If the third converter station S3 is in rectification mode, the fourth converter station S4 is in inverter mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will increase the power of the third converter station S3 by B1·P6, and the fourth power control device N4 will correspondingly increase the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will decrease the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 will correspondingly decrease the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0204] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in rectification mode, and the sixth converter station S6 is in inverter mode, the third power control device N3 will reduce the power of the third converter station S3 by B1·P6, and the fourth power control device N4 will correspondingly reduce the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. The fifth power control device N5 will increase the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 will correspondingly increase the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0205] If the third converter station S3 is in inverter mode, the fourth converter station S4 is in rectification mode, the fifth converter station S5 is in inverter mode, and the sixth converter station S6 is in rectification mode, the third power control device N3 will reduce the power of the third converter station S3 by B1·P6, and the fourth power control device N4 will correspondingly reduce the power of the fourth converter station S4 to reduce the dispatched power supplied to the second regional power grid G2. Similarly, the fifth power control device N5 will reduce the power of the fifth converter station S5 by B2·P6, and the sixth power control device N6 will correspondingly reduce the power of the sixth converter station S6 to reduce the dispatched power supplied to the second regional power grid G2.

[0206] According to the above embodiment, when the first regional power grid G1 experiences a fault and adjusts the power of the first converter station S1 to a fourth power value, the power of the second converter station S2 of the second regional power grid G2 is also adjusted to a fifth power value, so as to reduce the dispatch power supplied to the first converter station S1.

[0207] When the power regulated by the second regional power grid G2 exceeds its capacity, the power of other converter stations connected to G2 is proportionally adjusted to a sixth power value to share the excess power and prevent excessive power fluctuations that could affect the stable operation of G2. This allows for power allocation to the faulty first regional power grid G1 while ensuring the stable operation of G2, thus guaranteeing the safe and stable operation of G1.

[0208] Optionally, if when the DC transmission system is a two-terminal DC transmission system, and the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, the second power value is the difference between the first power value and the power loss value, or the fifth power value is the difference between the fourth power value and the power loss value.

[0209] Among them, the power loss value includes the power loss of the DC transmission line, the power loss of the grounding electrode line, and the power loss of the converter after the power of the two-end DC transmission system is adjusted.

[0210] The power loss value is equal to the power difference between the rectifier station and the inverter station of the double-ended DC transmission system after the power is adjusted, minus the power difference between the rectifier station and the inverter station of the double-ended DC transmission system before the power is adjusted. When the power of the double-ended DC transmission system increases, the power loss value is positive; when the power of the double-ended DC transmission system decreases, the power loss value is negative.

[0211] If the DC transmission system is a two-terminal DC transmission system, and the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, the second power value is the sum of the first power value and the power loss value, or the fifth power value is the sum of the fourth power value and the power loss value.

[0212] For example, the first power value is P1, the second power value is P2, the fourth power value is P4, the fifth power value is P5, and the power loss value is PL.

[0213] When the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, that is, the first regional power grid G1 is the power transmitting end and the second regional power grid G2 is the power receiving end. When the first regional power grid G1 transmits power to the second regional power grid G2, power loss will occur on the DC transmission line, i.e., power loss value PL. Therefore, P2 = P1 - PL, or P5 = P4 - PL.

[0214] When the first converter station S1 is in inverter mode and the second converter station S2 is in rectification mode, that is, the first regional power grid G1 is the receiving end and the second regional power grid G2 is the transmitting end. When the second regional power grid G2 transmits power to the first regional power grid G1, power loss will occur on the DC transmission line, i.e., power loss value PL. Therefore, P2 = P1 + PL, or P5 = P4 + PL.

[0215] Optionally, the DC transmission system can be a multi-terminal DC transmission system. In the converter stations of the multi-terminal DC transmission system, at least one is in rectification mode and at least one is in inverter mode.

[0216] For example, the first regional power grid G1 and the second regional power grid G2 are connected via a multi-terminal DC transmission system. The multi-terminal DC transmission system is connected through at least three converter stations (e.g., the first converter station S1, the second converter station S2, and other converter stations).

[0217] Among at least three converter stations, the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, or the first converter station S1 is in inverter mode and the second converter station S2 is in rectification mode.

[0218] Optionally, if when the DC transmission system is a multi-terminal DC transmission system, and the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, the second power value is the product of the difference between the first power value and the power loss value and the first coefficient, or the fifth power value is the product of the difference between the fourth power value and the power loss value and the first coefficient.

[0219] For example, the first power value is P1, the second power value is P2, the fourth power value is P4, the fifth power value is P5, the power loss value is PL, and the first coefficient is K1.

[0220] When the first converter station S1 is in rectification mode and the second converter station S2 is in inverter mode, that is, the first regional power grid G1 is the power transmission end and the second regional power grid G2 is the power receiving end, then P2=K1·(P1-PL) or P5=K1·(P4-PL).

[0221] Optionally, if when the DC transmission system is a multi-terminal DC transmission system, and the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, the second power value is the product of the sum of the first power value and the power loss value and the second coefficient, or the fifth power value is the product of the sum of the fourth power value and the power loss value and the second coefficient.

[0222] For example, the first power value is P1, the second power value is P2, the fourth power value is P4, the fifth power value is P5, the power loss value is PL, and the second coefficient is K2.

[0223] When the first converter station S1 is in inverter mode and the second converter station S2 is in rectifier mode, that is, the first regional power grid G1 is the power receiving end and the second regional power grid G2 is the power receiving end, then P2=K2·(P1+PL) or P5=K2·(P1+PL).

[0224] According to the example embodiment, the first coefficient and the second coefficient are determined through theoretical analysis, simulation, or experimentation based on the short-circuit capacity of the second regional power grid G2 and other regional power grids. The larger the short-circuit capacity of the second regional power grid G2, the larger the first coefficient and the second coefficient, where K1≤1 and K2≤1.

[0225] It should be noted that the functions of the first co-control substation 11, the second co-control substation 12, and the third co-control substation 13 can also be physically realized by the second stabilization device M2.

[0226] The technical solution provided in this application offers a method for coordinated control of DC transmission power in a power system, which provides corresponding power regulation to the supporting regional power grid when a fault occurs in a certain regional power grid.

[0227] When the regulating power provided by the supporting regional power grid exceeds its own capacity, the regional power grid connected to the supporting regional power grid also adjusts its power proportionally to share the power fluctuations of the supporting regional power grid. This allows for power regulation of the faulty regional power grid while ensuring the safety and stability of the supporting regional power grid, thereby ensuring the safe and stable normal operation of the entire power system.

[0228] According to another aspect of this application, a power system is provided, which includes a power system DC transmission power coordination control system as described above.

[0229] According to another aspect of this application, a non-volatile computer-readable storage medium is also provided, on which a computer program is stored, which enables a power system DC transmission power coordination control system to achieve, for example... Figures 2-3 The method for coordinated control of DC transmission power in power systems described herein.

[0230] According to another aspect of this application, a power system DC transmission power coordination control device is also provided. The device includes: one or more processors; and 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 perform the following functions: Figures 2-3 The method for coordinated control of DC transmission power in power systems described herein.

[0231] Finally, it should be noted that the above description is merely a preferred embodiment of this application and is not intended to limit this application. Although this application has been described in detail with reference to the foregoing embodiments, those skilled in the art can still modify the technical solutions of the foregoing embodiments or make equivalent substitutions for some of the technical features. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of this application should be included within the protection scope of this application.

Claims

1. A method for coordinated control of DC transmission power in a power system, characterized in that, The power system includes at least three regional power grids, each regional power grid including a stabilization control device and at least one converter station. Each converter station includes a power control device. All or part of the regional power grids are interconnected via a DC transmission system through their respective converter stations. A first converter station in a first regional power grid and a second converter station in a second regional power grid are interconnected via the DC transmission system. The DC transmission power coordination control method for the power system includes: When the first stabilization device of the first regional power grid issues a power increase command for the first regional power grid, the first power control device of the first regional power grid adjusts the power of the first converter station to a first power value; the second power control device of the second regional power grid adjusts the power of the second converter station to a second power value accordingly, so as to increase the dispatched power supplied to the first regional power grid. Determine the magnitude of the second power value and the first threshold. If the second power value is not less than the first threshold, the power of the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and the M regional power grids is adjusted proportionally to increase the dispatch power supplied to the second regional power grid. Wherein, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is the third power value, and the third power value is not greater than the second power value; and / or When the first stabilization device of the first regional power grid issues a power reduction command for the first regional power grid, the first power control device of the first regional power grid adjusts the power of the first converter station to a fourth power value; the second power control device of the second regional power grid adjusts the power of the second converter station to a fifth power value accordingly, so as to reduce the dispatched power supplied to the first regional power grid. Determine the magnitude of the fifth power value and the second threshold. If the fifth power value is not less than the second threshold, the power of the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and the M regional power grids is adjusted proportionally to reduce the dispatched power supplied to the second regional power grid. Wherein, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is the sixth power value, and the sixth power value is not greater than the fifth power value.

2. The power system DC transmission power coordination control method according to claim 1, characterized in that, The DC transmission system is a dual-end DC transmission system. Of the two converter stations in the dual-end DC transmission system, one is in rectification mode and the other is in inverter mode.

3. The power system DC transmission power coordination control method according to claim 2, characterized in that, The power loss value includes the power loss of the DC transmission line, the power loss of the grounding electrode line, and the power loss of the converter after the power of the dual-ended DC transmission system is adjusted. If the first converter station is in the rectification state and the second converter station is in the inverter state, then the second power value is the difference between the first power value and the power loss value, or the fifth power value is the difference between the fourth power value and the power loss value. If the first converter station is in the inverter state and the second converter station is in the rectifier state, then the second power value is the sum of the first power value and the power loss value, or the fifth power value is the sum of the fourth power value and the power loss value.

4. The method for coordinated control of DC transmission power in a power system according to claim 1, characterized in that, The DC transmission system is a multi-terminal DC transmission system; In the converter station of the multi-terminal DC transmission system, at least one is in rectification mode and at least one is in inverter mode.

5. The power system DC transmission power coordination control method according to claim 4, characterized in that, The power loss value includes the power loss of the DC transmission line, the power loss of the grounding electrode line, and the power loss of the converter after the power of the multi-terminal DC transmission system is adjusted. If the first converter station is in the rectification state and the second converter station is in the inverter state, the second power value is the product of the difference between the first power value and the power loss value and the first coefficient, or the fifth power value is the product of the difference between the fourth power value and the power loss value and the first coefficient. If the first converter station is in the inverter state and the second converter station is in the rectifier state, the second power value is the product of the sum of the first power value and the power loss value and the second coefficient, or the fifth power value is the product of the sum of the first power value and the power loss value and the second coefficient.

6. A DC transmission power coordination control system for a power system, characterized in that, The power system includes at least three regional power grids, each regional power grid including a stabilization control device and at least one converter station. Each converter station includes a power control device. All or part of the regional power grids are interconnected via a DC transmission system through the converter stations they contain. A first converter station in a first regional power grid and a second converter station in a second regional power grid are interconnected via the DC transmission system. The DC transmission power coordination control system of the power system includes a coordinating master station, a first coordinating substation, and N coordinating substations. The coordinating master station is used to coordinate and allocate the power of the converter stations in the regional power grid and send power adjustment commands. The first coordinating substation sends the power regulation value of the second converter station of the second regional power grid to the coordinating master station; The N co-control substations receive the power adjustment command sent by the co-control master station and send the power adjustment command to the power control device, wherein the N co-control substations are respectively configured in the N converter stations; When the first stabilization and control device of the first regional power grid issues a power boosting command, the first power control device of the first regional power grid adjusts the power of the first converter station in the first regional power grid to a first power value, and the second power control device of the second regional power grid adjusts the power of the second converter station accordingly to a second power value; the second power control device sends the second power value to the co-control master station through the first co-control substation; The co-control master station determines the magnitude of the second power value and the first threshold. If the co-control master station determines that the second power value is not less than the first threshold, then the co-control master station sends a first power adjustment command to the N co-control substations located in the second regional power grid in the DC transmission system between the second regional power grid and the M regional power grids to adjust the power of the N converter stations proportionally. The power adjustment device executes the first power adjustment command received by the N co-control substations to increase the allocated power supplied to the second regional power grid. Wherein, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is the third power value, and the third power value is not greater than the second power value; and / or When the first stabilization and control device of the first regional power grid issues a power reduction command, the first power control device of the first regional power grid adjusts the power of the first converter station in the first regional power grid to a fourth power value, and the second power control device of the second regional power grid adjusts the power of the second converter station accordingly to a fifth power value; the second power control device sends the fifth power value to the co-control master station through the first co-control substation; The co-control master station determines the magnitude of the fifth power value and the second threshold. If the co-control master station determines that the fifth power value is not less than the second threshold, then the co-control master station sends a second power adjustment command to the N co-control substations of the N converter stations located in the second regional power grid in the DC transmission system between the second regional power grid and the M regional power grids to adjust the power of the N converter stations proportionally. The power adjustment device executes the second power adjustment command received by the N co-control substations to reduce the allocated power supplied to the second regional power grid. Wherein, the M regional power grids do not include the first regional power grid, and M≥1, N≥1; the sum of the proportionally adjusted power of the N converter stations is the sixth power value, and the sixth power value is not greater than the fifth power value.

7. The power system DC transmission power coordination control system according to claim 6, characterized in that, The DC transmission system is a dual-end DC transmission system. Of the two converter stations in the dual-end DC transmission system, one is in rectification mode and the other is in inverter mode.

8. The power system DC transmission power coordination control system according to claim 7, characterized in that, The power loss value includes the power loss of the DC transmission line, the power loss of the grounding electrode line, and the power loss of the converter after the power of the dual-ended DC transmission system is adjusted. If the first converter station is in the rectification state and the second converter station is in the inverter state, then the second power value is the difference between the first power value and the power loss value, or the fifth power value is the difference between the fourth power value and the power loss value. If the first converter station is in the inverter state and the second converter station is in the rectifier state, then the second power value is the sum of the first power value and the power loss value, or the fifth power value is the sum of the fourth power value and the power loss value.

9. The power system DC transmission power coordination control system according to claim 6, characterized in that, The DC transmission system is a multi-terminal DC transmission system; In the converter station of the multi-terminal DC transmission system, at least one is in rectification mode and at least one is in inverter mode.

10. The power system DC transmission power coordination control system according to claim 9, characterized in that, The power loss value includes the power loss of the DC transmission line, the power loss of the grounding electrode line, and the power loss of the converter after the power of the multi-terminal DC transmission system is adjusted. If the first converter station is in the rectification state and the second converter station is in the inverter state, the second power value is the product of the difference between the first power value and the power loss value and the first coefficient, or the fifth power value is the product of the difference between the fourth power value and the power loss value and the first coefficient. If the first converter station is in the inverter state and the second converter station is in the rectifier state, the second power value is the product of the sum of the first power value and the power loss value and the second coefficient, or the fifth power value is the product of the sum of the first power value and the power loss value and the second coefficient.

11. An electric power system, characterized in that, Includes the power system DC transmission power coordination control system as described in any one of claims 6 to 10.

12. A non-volatile computer-readable storage medium having a computer program stored thereon, characterized in that, The computer program enables the power system DC transmission power coordination control system to implement the power system DC transmission power coordination control method as described in any one of claims 1 to 5.

13. A power system DC transmission power coordination control device, characterized in that, include: One or more processors; Storage device for storing one or more programs; When the one or more programs are executed by the one or more processors, the one or more processors implement the power system DC transmission power coordination control method as described in any one of claims 1 to 5.

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