A method, system and device for topological construction of a DC power distribution experimental system

Abstract

The present invention provides a method, system, and device for constructing a DC power distribution experimental system topology, comprising: providing at least four DC network endpoints; connecting the DC network endpoints via side branches to form a ring-shaped DC grid structure; providing an internal branch within the DC grid structure, with one end of the internal branch connected to two DC network endpoints connected to any one side branch, and the other end of the internal branch connected to the remaining DC network endpoints; connecting the ends of the side branch and the ends of the internal branch to the DC network endpoints via a switch module; and adjusting the DC distribution network topology by adjusting the switch module. The technical solution provided by the present invention can achieve a variety of topologies by adjusting the switch module.

Description

Technical Field

[0001] The present invention relates to a DC power distribution network technology, and in particular to a topology construction method, system and device for a DC power distribution experimental system. Background Art

[0002] Compared to traditional AC distribution networks, flexible DC distribution networks based on HVDC technology offer superior performance in terms of increasing power transmission capacity, enhancing system controllability, and improving power supply quality. They also effectively coordinate conflicts between distributed power sources and the grid, fully tapping the benefits and value of distributed energy. Therefore, flexible DC distribution networks, characterized by stability, affordability, reliability, and security, possess enormous economic value and market potential.

[0003] Today, grid interconnection is an inevitable trend in the development of the power industry worldwide and a key factor in global power development. A reasonable topology is a key issue in DC distribution network research. Studying different DC distribution network topologies and their electrical characteristics is crucial for the future application and promotion of DC power distribution. Therefore, to support DC distribution research, it is necessary to build an experimental system capable of implementing a variety of DC distribution network topologies.

[0004] The topologies of existing DC distribution experimental systems are generally inflexible. Single-node, two-node "I" structures, or four-node ring structures, which can be formed through switching, are very limited in the grid operating topologies that can be formed, making them difficult to adapt to the research needs of DC distribution topologies. Building an experimental system capable of constructing multiple topologies often requires setting up more electrical nodes (such as a 5-node or 6-node system), significantly increasing the scale and construction cost of the experimental system. Summary of the Invention

[0005] In order to meet the needs of multi-topology experimental environment required for DC distribution topology research, and at the same time reduce the scale of the experimental system as much as possible to save the cost and space of the experimental system, the patent of this invention proposes a topology construction method and device for a DC distribution experimental system with flexible topology.

[0006] The present invention provides a method for constructing a topology of a DC power distribution experimental system, comprising:

[0007] Set up at least 4 DC network endpoints;

[0008] The DC network endpoints are connected via side branches to form a ring-shaped DC grid structure. An internal branch is provided inside the DC grid structure, one end of the internal branch is connected to two DC network endpoints connected to any one side branch, and the other end of the internal branch is connected to the remaining DC network endpoints. Both ends of the side branch and both ends of the internal branch are connected to the DC network endpoints via a switch module.

[0009] By adjusting the switch module, the topology of the DC power distribution network is adjusted.

[0010] It also includes: the DC network endpoint is connected to the DC power supply module through a switch module.

[0011] By adjusting the switch modules at both ends of the internal branch, each end of the internal branch is connected to at most one DC network terminal.

[0012] The switch module includes a mechanical switch and a circuit breaker switch with an interlocking mechanism.

[0013] By adjusting the switch module, the topology of the DC distribution network is adjusted, including:

[0014] Set the DC network topology;

[0015] By adjusting the opening and closing of the switch modules connected at both ends of the side branches and the switch modules connected at both ends of the internal branches, the set DC network topology structure is adjusted;

[0016] The DC network topology includes: a two-terminal single-circuit line topology, a two-terminal double-circuit line topology, a two-terminal three-circuit line topology, a three-terminal pure single-circuit line chain topology, a three-terminal chain topology with a double-circuit line, a three-terminal pure single-circuit line ring network topology, a three-terminal ring network topology with a double-circuit line, a four-terminal pure single-circuit line chain topology, a four-terminal pure single-circuit line ring network topology, a four-terminal ring network topology with a double-circuit line, a three-terminal single-circuit line ring network with a single-circuit line radial branch topology, a double three-terminal single-circuit line ring network topology, a four-terminal three-circuit line three-single-circuit line radial branch topology, or a four-terminal chain topology with a single-circuit line.

[0017] The number of the DC network endpoints is 4, the number of the side branches is 4, and the number of the internal branch is 1.

[0018] The side branches and internal branches are all DC lines.

[0019] The present invention provides a topology construction system for a DC power distribution experimental system, comprising:

[0020] A setting module, used to set at least 4 DC network endpoints;

[0021] A building module for connecting the DC network endpoints through side branches to form a ring-shaped DC power grid structure. An internal branch is provided inside the DC power grid structure. One end of the internal branch is connected to the two DC network endpoints connected by any side branch, and the other end of the internal branch is connected to the remaining DC network endpoints. Both ends of the side branch and both ends of the internal branch are connected to the DC network endpoints through a switch module;

[0022] An adjustment module for adjusting the topology structure of the DC distribution network by adjusting the switch module.

[0023] The present invention provides a topology device for a DC distribution experiment system, including: at least 4 DC network endpoints;

[0024] The DC network endpoints are connected through side branches to form a ring-shaped DC power grid structure;

[0025] An internal branch is provided inside the DC power grid structure;

[0026] One end of the internal branch is connected to the two DC network endpoints connected by any side branch, and the other end of the internal branch is connected to the remaining DC network endpoints;

[0027] Both ends of the side branch and both ends of the internal branch are connected to the DC network endpoints through a switch module;

[0028] The switch module includes: a mechanical switch and / or a circuit breaker switch with an interlock mechanism.

[0029] Both the side branch and the internal branch are DC lines.

[0030] Compared with the closest prior art, the technical solution provided by the present invention has the following beneficial effects:

[0031] The technical solution provided by the present invention can achieve multiple topology structures by adjusting the switch module.

[0032] The technical solution provided by the present invention uses four DC network endpoints and five branches to build a DC distribution network structure including a switch module, and can construct a maximum four-node DC model, where a DC power source or load can be connected at each node to form an experimental network with different electrical characteristics. Brief Description of the Drawings

[0033] Figure 1 It is a flowchart of a topology construction method for a DC distribution experiment system provided by the present invention;

[0034] <000​​

[0035] Figure 3 A schematic diagram of a DC network topology that can be constructed under the DC power distribution experimental platform architecture provided by an embodiment of the present invention;

[0036] Among them, (a) double-terminal single-circuit topology, (b) double-terminal double-circuit topology, (c) double-terminal three-circuit topology, (d) three-terminal pure single-circuit chain topology, (e) three-terminal chain topology with one double-circuit, (f) three-terminal pure single-circuit ring topology, (g) three-terminal ring topology with one double-circuit, (h) four-terminal pure single-circuit chain topology, (i) four-terminal pure single-circuit ring topology, (j) four-terminal ring topology with one double-circuit, (k) three-terminal single-circuit ring with single-circuit radial branch topology, (l) double three-terminal single-circuit ring topology (double ring network), (m) four-terminal three-circuit radial branch topology, (n) four-terminal chain topology with one single-circuit 1, (o) four-terminal chain topology with one single-circuit 2;

[0037] Figure 4 A topology diagram of a ±750V four-terminal DC power distribution experimental system provided in an embodiment of the present invention;

[0038] Figure 5 This is a design diagram of a ±750V four-terminal DC power distribution experimental platform case provided by an embodiment of the present invention. DETAILED DESCRIPTION

[0039] The present invention will be further described in detail below with reference to the accompanying drawings:

[0040] Example 1

[0041] Figure 1 The present invention provides a flow chart of a topology construction method of a DC power distribution experimental system, such as Figure 1 As shown, the present invention provides a method for constructing a topology of a DC power distribution experimental system, comprising:

[0042] Set up at least 4 DC network endpoints;

[0043] The DC network endpoints are connected via side branches to form a ring-shaped DC grid structure. An internal branch is provided inside the DC grid structure, one end of the internal branch is connected to two DC network endpoints connected to any one side branch, and the other end of the internal branch is connected to the remaining DC network endpoints. Both ends of the side branch and both ends of the internal branch are connected to the DC network endpoints via a switch module.

[0044] By adjusting the switch module, the topology of the DC power distribution network is adjusted.

[0045] It also includes: the DC network endpoint is connected to the DC power supply module through a switch module.

[0046] By adjusting the switch modules at both ends of the internal branch, each end of the internal branch is connected to at most one DC network terminal.

[0047] The switch module includes a mechanical switch and a circuit breaker switch with an interlocking mechanism.

[0048] By adjusting the switch module, the topology of the DC distribution network is adjusted, including:

[0049] Set the DC network topology;

[0050] By adjusting the opening and closing of the switch modules connected at both ends of the side branches and the switch modules connected at both ends of the internal branches, the set DC network topology structure is adjusted;

[0051] like Figure 3 As shown, the DC network topology includes: a. a two-terminal single-circuit line topology, b. a two-terminal double-circuit line topology, c. a two-terminal three-circuit line topology, d. a three-terminal pure single-circuit line chain topology, e. a three-terminal chain topology with a double-circuit line, f. a three-terminal pure single-circuit line ring network topology, g. a three-terminal ring network topology with a double-circuit line, h. a four-terminal pure single-circuit line chain topology, i. a four-terminal pure single-circuit line ring network topology, j. a four-terminal ring network topology with a double-circuit line, k. a three-terminal single-circuit line ring network with a single-circuit line radial branch topology, l. a double three-terminal single-circuit line ring network topology, m. a four-terminal three-circuit line radial branch topology, n. a four-terminal chain topology with a single-circuit line 1 or o. a four-terminal chain topology with a single-circuit line 2.

[0052] The number of the DC network endpoints is 4, the number of the side branches is 4, and the number of the internal branch is 1.

[0053] The side branches and internal branches are all DC lines.

[0054] Example 2

[0055] Based on the same inventive concept, the present invention provides a DC power distribution experimental system topology construction system, which may include:

[0056] A setting module, used to set at least 4 DC network endpoints;

[0057] A construction module is configured to connect the DC network endpoints via side branches to form a ring-shaped DC grid structure, wherein an internal branch is provided within the DC grid structure, wherein one end of the internal branch is connected to two DC network endpoints connected to any one side branch, and the other end of the internal branch is connected to the remaining DC network endpoints, and both ends of the side branch and the internal branch are connected to the DC network endpoints via a switch module;

[0058] The regulating module is used to regulate the topology of the DC distribution network by regulating the switch module.

[0059] The building module further includes: the DC network endpoint is connected to the DC power supply module through a switch module.

[0060] By adjusting the switch modules at both ends of the internal branch, each end of the internal branch is connected to at most one DC network terminal.

[0061] The switch module includes a mechanical switch and a circuit breaker switch with an interlocking mechanism.

[0062] By adjusting the switch module, the topology of the DC distribution network is adjusted, including:

[0063] Set the DC network topology;

[0064] By adjusting the opening and closing of the switch modules connected at both ends of the side branches and the switch modules connected at both ends of the internal branches, the set DC network topology structure is adjusted;

[0065] like Figure 3 As shown, the DC network topology includes: a. a two-terminal single-circuit line topology, b. a two-terminal double-circuit line topology, c. a two-terminal three-circuit line topology, d. a three-terminal pure single-circuit line chain topology, e. a three-terminal chain topology with a double-circuit line, f. a three-terminal pure single-circuit line ring network topology, g. a three-terminal ring network topology with a double-circuit line, h. a four-terminal pure single-circuit line chain topology, i. a four-terminal pure single-circuit line ring network topology, j. a four-terminal ring network topology with a double-circuit line, k. a three-terminal single-circuit line ring network with a single-circuit line radial branch topology, l. a double three-terminal single-circuit line ring network topology, m. a four-terminal three-circuit line radial branch topology, n. a four-terminal chain topology with a single-circuit line 1 or o. a four-terminal chain topology with a single-circuit line 2.

[0066] The number of the DC network endpoints is 4, the number of the side branches is 4, and the number of the internal branch is 1.

[0067] The side branches and internal branches are all DC lines.

[0068] Example 3:

[0069] Based on the same inventive concept, the present invention also provides a topology device for a DC power distribution experimental system, which may include: at least 4 DC network endpoints;

[0070] The DC network endpoints are connected through side branches to form a ring-shaped DC power grid structure;

[0071] An internal branch is provided inside the DC power grid structure;

[0072] One end of the internal branch is connected to two DC network endpoints connected by any side branch, and the other end of the internal branch is connected to the remaining DC network endpoints;

[0073] Both ends of the side branch and both ends of the internal branch are connected to the DC network endpoints through switch modules;

[0074] The switch module may include: a mechanical switch and / or a circuit breaker switch with an interlock mechanism.

[0075] Both the side branch and the internal branch may be DC lines.

[0076] Embodiment 4

[0077] To meet the requirements of a multi-topology experimental environment for DC power distribution topology research and to reduce the scale of the experimental system as much as possible to save the cost and floor area of the experimental system, the invention patent proposes a topology construction method for a DC power distribution experimental system with flexible topology:

[0078] Figure 2 For the schematic diagram of the "day" - shaped network structure of the 4 - endpoint 5 - branch DC power distribution experimental platform, as shown in Figure 2 shown, a "day" - shaped network structure with 4 endpoints and 5 branches is established. By opening and closing the circuit breaker switches, the DC power distribution topology required for the experiment is constructed, so as to flexibly select various network topology structures. Among them, 4 DC network endpoints are configured with 4 DC power supply modules (that is, 1 DC power supply is configured for each endpoint), and a "square" - shaped ring - shaped DC power grid structure of 4 - end power supplies is constructed through 4 branches; each end of the 5th branch is respectively connected to 2 DC power supply endpoints, and a change - over switch or a circuit breaker switch with an interlock mechanism is used to ensure that only 1 DC power supply endpoint is connected each time. Circuit breaker switches are provided at both ends of each branch in this network and at the DC power supplies at the network endpoints for switching.

[0079] In this way, by setting the minimum number of DC power supplies and DC lines, and by switching DC branches and DC power supplies and changing the branch impedance, various DC network topology forms including double - loop structures can be flexibly realized, meeting the research needs of different DC power distribution operation modes.

[0080] Embodiment 5

[0081] The present invention provides an implementation case of a ±750V four-terminal DC distribution experimental platform:

[0082] 1) The experimental platform is equipped with 4 DC power supply modules of ±750V to construct a ±750V DC ring network distribution experimental model with a 4-terminal power supply and 5 branches.

[0083] 2) The DC power supply modules of ±750V are all connected from the 400V AC power supply in the laboratory, and their DC ±750V output is realized through voltage transformation and AC / DC rectification transformation.

[0084] 3) 5 DC branch simulation lines are equipped, and DC circuit breakers and line simulators with adjustable parameters are configured at both ends of each DC line segment.

[0085] 4) The DC distribution outgoing line terminals can be connected to "energy storage simulation equipment, photovoltaic power supply simulation equipment, wind power simulation equipment, AC load simulation equipment, and DC load simulation equipment". Each simulation equipment is modular and is connected to the ±750V DC distribution experimental model through the corresponding transformer and voltage transformation module.

[0086] 5) Each ±750V DC power supply is connected to the power distribution cabinets (5) representing the DC busbars and is interconnected through DC simulation lines to form a "day" - shaped ring network structure.

[0087] 6) One DC simulation line can select the connected DC current source through the switching switches (or circuit breaker switch combinations) at both ends and can form a DC double - ring network structure.

[0088] As Figure 4 shown, it is the "day" - shaped DC distribution laboratory topological structure proposed by the present invention. A series of composite topological structures and various special grid forms can be realized through flexible switching.

[0089] As Figure 5 shown, it is a design diagram of a ±750V four - terminal DC distribution experimental platform case.

[0090] The preferred embodiments of the present invention have been described in detail above. However, the present invention is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present invention, various equivalent transformations can be made to the technical solutions of the present invention, and these equivalent transformations all belong to the protection scope of the present invention.

[0091] Those skilled in the art will appreciate that the embodiments of the present application can be provided as methods, systems, or computer program products. Therefore, the present application can adopt the structure of a complete hardware embodiment, a complete software embodiment, or an embodiment in combination with software and hardware. Moreover, the present application can adopt the structure of a computer program product implemented on one or more computer-usable storage media (including but not limited to magnetic disk storage, CD-ROM, optical storage, etc.) that contain computer-usable program code.

[0092] The present application is described with reference to the flowcharts and / or block diagrams of the methods, devices (systems), and computer program products according to the embodiments of the present application. It should be understood that each process and / or box in the flowchart and / or block diagram, as well as the combination of the processes and / or boxes in the flowchart and / or block diagram, can be implemented by computer program instructions. These computer program instructions can be provided to a processor of a general-purpose computer, a special-purpose computer, an embedded processor, or other programmable data processing device to produce a machine, so that the instructions executed by the processor of the computer or other programmable data processing device generate instructions for implementing the steps in the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A device that provides the functions specified in a block or multiple blocks.

[0093] These computer program instructions may also be stored in a computer readable memory that can direct a computer or other programmable data processing device to work in a specific manner, so that the instructions stored in the computer readable memory produce an article of manufacture comprising an instruction device, which implements the process Figure 1 a process or multiple processes and / or boxes Figure 1 The function specified in one or more boxes.

[0094] These computer program instructions can also be loaded onto a computer or other programmable data processing device so that a series of operational steps are executed on the computer or other programmable device to produce a computer-implemented process, thereby providing the instructions executed on the computer or other programmable device for implementing the process. Figure 1 a process or multiple processes and / or boxes Figure 1 A step that specifies a function in one or more boxes.

[0095] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit its scope of protection. Although the present application has been described in detail with reference to the above embodiments, ordinary technicians in the relevant field should understand that after reading this application, those skilled in the art may still make various changes, modifications or equivalent substitutions to the specific implementation methods of the application, but these changes, modifications or equivalent substitutions are all within the scope of protection of the pending claims of the application.

Claims

1. A method for constructing a topology of a DC power distribution experimental system, characterized in that: include: Set up at least 4 DC network endpoints; The DC network endpoints are connected via side branches to form a ring-shaped DC grid structure. An internal branch is provided inside the DC grid structure, one end of the internal branch is connected to two DC network endpoints connected to any one side branch, and the other end of the internal branch is connected to the remaining DC network endpoints. Both ends of the side branch and both ends of the internal branch are connected to the DC network endpoints via a switch module. By adjusting the switch module, the topology of the DC distribution network is adjusted; By adjusting the switch modules at both ends of the internal branch, each end of the internal branch is connected to at most one DC network terminal.

2. The method for constructing a topology of a DC power distribution experimental system according to claim 1, wherein: Also includes: The DC network endpoint is connected to the DC power supply module through a switch module.

3. The method for constructing a topology of a DC power distribution experimental system according to claim 1 or 2, wherein: The switch module includes: a mechanical switch and / or a circuit breaker switch with an interlocking mechanism.

4. The method for constructing a topology of a DC power distribution experimental system according to claim 1, wherein: By adjusting the switch module, the topology of the DC distribution network is adjusted, including: Set the DC network topology; By adjusting the opening and closing of the switch modules connected at both ends of the side branches and the switch modules connected at both ends of the internal branches, the set DC network topology structure is adjusted; The DC network topology includes: a two-terminal single-circuit line topology, a two-terminal double-circuit line topology, a two-terminal three-circuit line topology, a three-terminal pure single-circuit line chain topology, a three-terminal chain topology with a double-circuit line, a three-terminal pure single-circuit line ring network topology, a three-terminal ring network topology with a double-circuit line, a four-terminal pure single-circuit line chain topology, a four-terminal pure single-circuit line ring network topology, a four-terminal ring network topology with a double-circuit line, a three-terminal single-circuit line ring network with a single-circuit line radial branch topology, a double three-terminal single-circuit line ring network topology, a four-terminal three-circuit line three-single-circuit line radial branch topology, or a four-terminal chain topology with a single-circuit line.

5. The method for constructing a topology of a DC power distribution experimental system according to claim 1, wherein: The number of the DC network endpoints is 4, the number of the side branches is 4, and the number of the internal branch is 1.

6. The method for constructing a topology of a DC power distribution experimental system according to claim 1 or 5, wherein: The side branches and internal branches are all DC lines.

7. A DC power distribution experimental system topology construction system, characterized in that: include: A setting module, used to set at least 4 DC network endpoints; A construction module is configured to connect the DC network endpoints via side branches to form a ring-shaped DC grid structure, wherein an internal branch is provided within the DC grid structure, wherein one end of the internal branch is connected to two DC network endpoints connected to any one side branch, and the other end of the internal branch is connected to the remaining DC network endpoints, and both ends of the side branch and the internal branch are connected to the DC network endpoints via a switch module; A regulating module, configured to adjust the topology of the DC distribution network by regulating the switch module; By adjusting the switch modules at both ends of the internal branch, each end of the internal branch is connected to at most one DC network terminal.

8. A DC power distribution experimental system topology device, characterized in that: include: At least 4 DC network endpoints; The DC network endpoints are connected via side branches to form a ring-shaped DC grid structure; An internal branch is provided inside the DC grid structure; One end of the internal branch is connected to two DC network endpoints connected to any one of the side branches, and the other end of the internal branch is connected to the remaining DC network endpoints; The two ends of the side branch and the two ends of the internal branch are connected to the DC network endpoints through a switch module.

9. The DC power distribution experimental system topology device according to claim 8, characterized in that: The switch module includes: a mechanical switch and / or a circuit breaker switch with an interlocking mechanism.

10. The DC power distribution experimental system topology device according to claim 8, characterized in that: The side branches and internal branches are all DC lines.

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