Power supply system
By designing a power system including DC bus, new energy controller and new energy power generation unit, the problem of new energy not meeting the grid connection conditions and energy loss is solved, and efficient new energy utilization is achieved.
Patent Information
- Application Number
- CN202323273926.1
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2023-11-30
- Publication Date
- 2025-02-11
- Estimated Expiration
- 2033-11-30
AI Technical Summary
In the prior art, new energy does not meet the grid connection conditions or causes energy loss during the grid connection process, limiting the use and utilization rate of new energy.
A power supply system is designed, including a DC bus, M new energy controllers and a new energy power generation unit corresponding to each new energy controller. By electrically connecting the output end of the new energy power generation unit to the input end of the new energy controller, and electrically connecting the output end of the new energy controller to the positive and negative electrodes of the DC bus, the direct output of the DC power is achieved.
By reducing the inverter, boost, transmission, downward and distribution links of new energy during the grid connection process, energy loss is reduced and the utilization rate of new energy is improved.
Smart Images
Figure CN222464159U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to the field of power systems, in particular to a power supply system. Background Art
[0002] New energy refers to renewable energy that is developed and utilized based on new technologies, including solar energy, wind energy, tidal energy, biomass energy, etc. The power generation and utilization of new energy usually includes multiple power generation equipment, such as solar photovoltaic panels, wind turbines, tidal turbines, etc., which are used to convert the energy of natural resources into electrical energy. New energy grid connection refers to connecting the power generation system of new energy to the main grid of the power system to achieve electrical energy interaction and interconnected operation between the two.
[0003] In the prior art, the grid connection of new energy is to connect new energy to the main grid of the power system after it is inverted by an inverter and then boosted to 10kv or higher voltage level by a transformer. Since the main grid of the power system has high requirements for the power supply, new energy does not meet the grid connection conditions in many projects, which limits the use of new energy. In addition, in the process of grid connection, new energy loses energy after going through the links of inversion, boosting, transmission, step-down, and distribution, which reduces the utilization rate of new energy. Utility Model Content
[0004] The utility model provides a power supply system, which is used to solve the problem in the prior art that new energy does not meet the grid connection conditions or causes energy loss during the grid connection process.
[0005] The present application provides a power supply system, comprising: a DC bus, M new energy controllers, and a new energy power generation unit corresponding to each new energy controller, wherein M is a positive integer;
[0006] For each group of new energy controller and new energy power generation unit, the output end of the new energy power generation unit is electrically connected to the input end of the new energy controller, the first output end of the new energy controller is electrically connected to the positive pole of the DC bus, and the second output end of the new energy controller is electrically connected to the negative pole of the DC bus;
[0007] The positive pole of the DC bus and the negative pole of the DC bus serve as DC output terminals of the DC power supply system.
[0008] In a possible implementation, the DC bus includes a first DC bus, a second DC bus, and a third DC bus, wherein the third DC bus includes a neutral line; the M new energy controllers include N first new energy controllers and Z second new energy controllers, wherein N and Z are both positive integers, and the sum of N and Z is equal to M;
[0009] For each group of the first new energy controller and the first new energy power generation unit corresponding to the first new energy controller, the output end of the first new energy power generation unit is electrically connected to the input end of the first new energy controller, the first output end of the first new energy controller is electrically connected to the positive pole of the first DC bus, and the second output end of the first new energy controller is electrically connected to the negative pole of the first DC bus;
[0010] For each group of the second new energy controller and the second new energy power generation unit corresponding to the second new energy controller, the output end of the second new energy power generation unit is electrically connected to the input end of the second new energy controller, the first output end of the second new energy controller is electrically connected to the positive pole of the second DC bus, and the second output end of the second new energy controller is electrically connected to the negative pole of the second DC bus;
[0011] The positive pole of the third DC bus is electrically connected to the positive pole of the first DC bus, the neutral line of the third DC bus is electrically connected to the negative pole of the first DC bus and the positive pole of the second DC bus, the negative pole of the third DC bus is electrically connected to the negative pole of the second DC bus, and the positive pole of the third DC bus, the neutral line of the third DC bus and the negative pole of the third DC bus serve as the DC output end of the DC power supply system.
[0012] In a possible implementation, the method further includes: a first monitoring module;
[0013] The first monitoring module is communicatively connected to the communication port of each new energy controller via the field bus.
[0014] In a possible implementation, the invention further includes: L rectifier modules and a mains input unit corresponding to each rectifier module, wherein L is a positive integer;
[0015] For each group of AC power input unit and rectifier module, the output end of the AC power input unit is electrically connected to the input end of the rectifier module, the first output end of the rectifier module is electrically connected to the positive pole of the DC bus, the second output end of the rectifier module is electrically connected to the negative pole of the DC bus, and the communication port of the rectifier module is electrically connected to the monitoring module through a field bus.
[0016] In a possible implementation, a second monitoring module is also included;
[0017] The first communication port of the second monitoring module is communicatively connected to the first communication port of each first new energy controller and the communication port of each second new energy controller through a field bus.
[0018] In a possible implementation, the second communication port of each first new energy controller and the second communication port of each second new energy controller are electrically connected via a voltage-sharing cable.
[0019] In a possible implementation, the second communication port of each first new energy controller and the second communication port of each second new energy controller are electrically connected via a synchronization cable.
[0020] In a possible implementation, a third monitoring module is also included;
[0021] The first communication port of the third monitoring module is respectively connected to the first communication port of each first new energy controller through the field bus, and the second communication port of the third monitoring module is respectively connected to the first communication port of each second new energy controller through the field bus.
[0022] In a possible implementation, the field bus is a CAN bus or an RS485 bus.
[0023] In a possible implementation, the neutral line is grounded; or
[0024] The neutral line is grounded with high resistance; or
[0025] The neutral line is not grounded.
[0026] The beneficial effects of the utility model are as follows:
[0027] The present application provides a power supply system, comprising: a DC bus, M new energy controllers, and a new energy power generation unit corresponding to each new energy controller, wherein M is a positive integer; for each group of new energy controllers and new energy power generation units, the output end of the new energy power generation unit is electrically connected to the input end of the new energy controller, the first output end of the new energy controller is electrically connected to the positive pole of the DC bus, and the second output end of the new energy controller is electrically connected to the negative pole of the DC bus; the positive pole of the DC bus and the negative pole of the DC bus serve as the DC output end of the DC power supply system. The power supply system disclosed in the utility model can directly connect the DC power outputted by the DC bus to the user-end device by connecting the new energy controller between the new energy power generation unit and the DC bus, so that the DC power outputted by the new energy power generation unit does not need to go through the links of inversion, boosting, transmission, step-down, and distribution, thereby reducing energy loss. BRIEF DESCRIPTION OF THE DRAWINGS
[0028] In order to more clearly illustrate the technical solutions in the embodiments of the present invention, the drawings required for use in the description of the embodiments will be briefly introduced below. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.
[0029] Figure 1 A schematic diagram of the structure of a power supply system provided in an embodiment of the present application;
[0030] Figure 2 A schematic diagram of the structure of another power supply system provided in an embodiment of the present application;
[0031] Figure 3 A schematic diagram of the structure of another power supply system provided in an embodiment of the present application;
[0032] Figure 4 A schematic diagram of the structure of a power supply system with a neutral line provided in an embodiment of the present application;
[0033] Figure 5 A schematic diagram of the structure of another power supply system with a neutral line provided in an embodiment of the present application;
[0034] Figure 6 A schematic diagram of the structure of another power supply system with a neutral line provided in an embodiment of the present application;
[0035] Figure 7 A schematic diagram of the structure of another power supply system with a neutral line provided in an embodiment of the present application;
[0036] Figure 8 A schematic diagram of the structure of another power supply system with a neutral line provided in an embodiment of the present application. DETAILED DESCRIPTION
[0037] In order to make the purpose, technical solution and advantages of the utility model clearer, the utility model will be further described in detail below in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the utility model, not all of the embodiments. Based on the embodiments of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.
[0038] Renewable energy grid connection refers to connecting the power generation system of renewable energy to the main grid of the power system to achieve electric energy interaction and interconnected operation between the two. In the prior art, renewable energy grid connection means that renewable energy is inverted by an inverter, and then boosted to 10kv or higher voltage level by a transformer before being connected to the main grid of the power system for use. Since the main grid of the power system has high requirements for grid power supply, renewable energy in many projects does not meet the grid connection conditions, which limits the use of renewable energy. In addition, during the grid connection process, renewable energy loses energy after going through the links of inversion, boosting, transmission, step-down, and distribution, which reduces the utilization rate of renewable energy.
[0039] Based on the above problems, the present application provides a power supply system, such as Figure 1, which is a schematic diagram of the structure of a power supply system provided in an embodiment of the present application, the power supply system comprises: a DC bus 101, M new energy controllers 102, and a new energy power generation unit 103 corresponding to each new energy controller, wherein M is a positive integer;
[0040] For each group of new energy controller 102 and new energy power generation unit 103, the output end of the new energy power generation unit 103 is electrically connected to the input end of the new energy controller 102, the first output end of the new energy controller 102 is electrically connected to the positive pole of the DC bus 101, and the second output end of the new energy controller 102 is electrically connected to the negative pole of the DC bus 101;
[0041] The positive pole of the DC bus 101 and the negative pole of the DC bus 101 serve as DC output terminals of the DC power supply system.
[0042] In the embodiment of the utility model, for each group of new energy controller 102 and new energy power generation unit 103, the output end of the new energy power generation unit 103 is electrically connected to the input end of the new energy controller 102, the first output end of the new energy controller 102 is electrically connected to the positive pole of the DC bus 101, and the second output end of the new energy controller 102 is electrically connected to the negative pole of the DC bus 101; the positive pole of the DC bus 101 and the negative pole of the DC bus 101 serve as the DC output end of the DC power supply system. The power supply system disclosed in the utility model can directly connect the DC power output by the DC bus to the user-end device by connecting the new energy controller between the new energy power generation unit and the DC bus, so that the DC power output by the new energy power generation unit does not need to go through the links of inversion, boosting, transmission, step-down, and distribution, thereby reducing energy loss.
[0043] Among them, the new energy power generation unit 103 can be a solar panel, a wind turbine, or other new energy power generation units, and the embodiment of the utility model does not make any limitation on this; the new energy controller 102 can be a photovoltaic controller, a wind power generation controller, or other new energy controllers, and the embodiment of the utility model does not make any limitation on this. In addition, it should be noted that the new energy power generation unit 103 and the new energy controller 102 are corresponding. For example, if the new energy power generation unit 103 is a solar panel, the new energy controller 102 is a photovoltaic controller, and if the new energy power generation unit 103 is a wind turbine, the new energy controller 102 is a wind power generation controller.
[0044] The new energy controller 102 is used to convert the direct current output by the new energy power generation unit 103 into a direct current output with a stable and controllable voltage.
[0045] In one embodiment, if Figure 2As shown, the power supply system provided by the embodiment of the utility model may further include: a first monitoring module 201;
[0046] The first monitoring module 201 is communicatively connected to the communication port of each new energy controller 102 via the field bus.
[0047] The field bus may be a CAN bus or an RS485 bus.
[0048] In one embodiment, when applied to communication power supply, since the nominal voltage of the DC load is 240V and 336V, the corresponding voltage range is 200V~288V and 300V~400V. Specifically, M new energy controllers 102 are connected in parallel to the positive and negative poles of the DC bus 101, and are connected to the first monitoring module 201 through the field bus, wherein the input end of the new energy controller 102 is electrically connected to the input end of the new energy power generation unit 103. The first monitoring module 201 controls the new energy controller 102 through the field bus.
[0049] like Figure 3 As shown, the power supply system provided in the embodiment of the present application may further include: L rectifier modules 301, and a mains input unit 302 corresponding to each rectifier module, wherein L is a positive integer;
[0050] For each group of AC power input unit 302 and rectifier module 301, the output end of the AC power input unit 302 is electrically connected to the input end of the rectifier module 301, the first output end of the rectifier module 301 is electrically connected to the positive pole of the DC bus 101, the second output end of the rectifier module 301 is electrically connected to the negative pole of the DC bus 101, and the communication port of the rectifier module 301 is electrically connected to the first monitoring module 201 via the field bus.
[0051] In a specific embodiment, the new energy controller 102 of the power supply system can also be used in parallel with the rectifier module 301 of the communication power supply to jointly power the load and the equipment, and the first monitoring module 201 controls the new energy controller 102 and the rectifier module 301 uniformly through the field bus. Among them, the mains input unit 302 supplies power to the rectifier module 301.
[0052] In the embodiment of the present application, it can also be applied to a DC microgrid, an energy storage system or a UPS DC bus, and the corresponding voltage range is 750V or 400V to 800V. Figure 4As shown, it is a structural schematic diagram of a power supply system with a neutral line provided in an embodiment of the present application, wherein the DC bus includes a first DC bus 401, a second DC bus 402 and a third DC bus 403, wherein the third DC bus 403 includes a neutral line; the M new energy controllers include N first new energy controllers 404 and Z second new energy controllers 405, wherein N and Z are both positive integers;
[0053] For each group of the first new energy controller 404 and the first new energy power generation unit 406 corresponding to the first new energy controller 404, the output end of the first new energy power generation unit 406 is electrically connected to the input end of the first new energy controller 404, the first output end of the first new energy controller 404 is electrically connected to the positive pole of the first DC bus 401, and the second output end of the first new energy controller 404 is electrically connected to the negative pole of the first DC bus 401;
[0054] For each group of the second new energy controller 405 and the second new energy power generation unit 407 corresponding to the second new energy controller 405, the output end of the second new energy power generation unit 407 is electrically connected to the input end of the second new energy controller 405, the first output end of the second new energy controller 405 is electrically connected to the positive pole of the second DC bus 402, and the second output end of the second new energy controller 405 is electrically connected to the negative pole of the second DC bus 402;
[0055] The positive pole of the third DC bus 403 is electrically connected to the positive pole of the first DC bus 401, the neutral line of the third DC bus 403 is electrically connected to the negative pole of the first DC bus 401 and the positive pole of the second DC bus 402, the negative pole of the third DC bus 403 is electrically connected to the negative pole of the second DC bus 402, and the positive pole of the third DC bus 403, the neutral line of the third DC bus 403 and the negative pole of the third DC bus 403 serve as the DC output end of the DC power supply system.
[0056] In the embodiment of the utility model, the sum of N and Z may be equal to M.
[0057] In a specific embodiment, when applied to a DC microgrid, an energy storage system or connected to a UPS DC bus, N first new energy controllers 404 are connected in parallel to the positive pole and the neutral line of the third DC bus 403, and Z second new energy controllers 405 are connected in parallel to the neutral line and the negative pole of the third DC bus 403.
[0058] Among them, the neutral line can be grounded, the neutral line can be grounded with high resistance, and the neutral line can be ungrounded.
[0059] It should be noted that the system with an ungrounded neutral line can be used in scenarios with higher requirements for power supply reliability, and can continue to supply power when a single-pole grounding fault occurs; the system with a grounded neutral line can be used in scenarios with higher requirements for safety, and can quickly cut off the circuit when a fault occurs to protect the personal safety of operators and maintenance personnel; the application scenario of the system with a high-resistance grounded neutral line can be between the above two systems.
[0060] In one embodiment, if Figure 5 As shown, the power supply system with a neutral line provided in the embodiment of the present application may further include a second monitoring module 501;
[0061] The first communication port of the second monitoring module 501 is communicatively connected to the first communication port of each first new energy controller 404 and the first communication port of each second new energy controller 405 through the field bus.
[0062] In a specific embodiment, the second monitoring module 501 identifies the first new energy controller 404 and the second new energy controller 405 by their addresses, serial numbers or identification numbers, and controls the synchronization and voltage balancing of the first new energy controller 404 and the second new energy controller 405.
[0063] In another embodiment, if Figure 6 As shown, it is a structural schematic diagram of another power supply system with a neutral line provided in an embodiment of the present application, and the second communication port of each first new energy controller 404 and the second communication port of each second new energy controller 405 are electrically connected through a voltage-equalizing cable.
[0064] In a specific embodiment, the voltage-sharing cable enables synchronized operation between the controllers.
[0065] In another embodiment, if Figure 7 As shown, it is a structural schematic diagram of another power supply system with a neutral line provided in an embodiment of the present application, and the second communication port of each first new energy controller 404 and the second communication port of each second new energy controller 405 are electrically connected through a synchronization cable.
[0066] In a specific embodiment, a synchronization cable enables synchronized operation between the controllers.
[0067] In another embodiment, if Figure 8 As shown, it is a structural schematic diagram of another power supply system with a neutral line provided in an embodiment of the present application, and further includes a third monitoring module 801;
[0068] The first communication port of the third monitoring module 801 is respectively connected to the first communication port of each first new energy controller 404 through the field bus, and the second communication port of the third monitoring module 801 is respectively connected to the first communication port of each second new energy controller 405 through the field bus.
[0069] In a specific embodiment, the third monitoring module 801 realizes synchronous operation of the new energy controllers by identifying the first new energy controller 404 and the second new energy controller 405, and ensures voltage balance between the positive pole and the neutral line, and between the neutral line and the negative pole of the third DC bus.
[0070] The utility model discloses a power supply system, including: a DC bus, M new energy controllers, and a new energy power generation unit corresponding to each new energy controller, wherein M is a positive integer; for each group of new energy controllers and new energy power generation units, the output end of the new energy power generation unit is electrically connected to the input end of the new energy controller, the first output end of the new energy controller is electrically connected to the positive pole of the DC bus, and the second output end of the new energy controller is electrically connected to the negative pole of the DC bus; the positive pole of the DC bus and the negative pole of the DC bus serve as the DC output end of the DC power supply system. The power supply system disclosed in the utility model can directly connect the DC power outputted by the DC bus to the user-end device by connecting the new energy controller between the new energy power generation unit and the DC bus, so that the DC power outputted by the new energy power generation unit does not need to go through the links of inversion, boosting, transmission, step-down, and distribution, thereby reducing energy loss.
[0071] In addition, the power supply system provided by the embodiment of the utility model can adapt to different voltage and application scenario requirements through different wiring methods of new energy controllers (such as photovoltaic controllers, wind power generation controllers, etc.), thereby improving the flexibility of the power supply system.
[0072] Those skilled in the art may make various modifications and variations to the present invention without departing from the spirit and scope of the present invention. Thus, if these modifications and variations of the present invention fall within the scope of the claims of the present invention and their equivalents, the present invention is intended to include these modifications and variations.
Claims
1. A power supply system, characterized in that: include: A DC bus, M new energy controllers, and a new energy power generation unit corresponding to each new energy controller, wherein M is a positive integer; For each group of new energy controller and new energy power generation unit, the output end of the new energy power generation unit is electrically connected to the input end of the new energy controller, the first output end of the new energy controller is electrically connected to the positive pole of the DC bus, and the second output end of the new energy controller is electrically connected to the negative pole of the DC bus; The positive pole of the DC bus and the negative pole of the DC bus serve as DC output terminals of the power supply system.
2. The system according to claim 1, characterized in that The DC bus includes a first DC bus, a second DC bus and a third DC bus, wherein the third DC bus includes a neutral line; the M new energy controllers include N first new energy controllers and Z second new energy controllers, wherein N and Z are both positive integers, and the sum of N and Z is equal to M; For each group of the first new energy controller and the first new energy power generation unit corresponding to the first new energy controller, the output end of the first new energy power generation unit is electrically connected to the input end of the first new energy controller, the first output end of the first new energy controller is electrically connected to the positive pole of the first DC bus, and the second output end of the first new energy controller is electrically connected to the negative pole of the first DC bus; For each group of the second new energy controller and the second new energy power generation unit corresponding to the second new energy controller, the output end of the second new energy power generation unit is electrically connected to the input end of the second new energy controller, the first output end of the second new energy controller is electrically connected to the positive pole of the second DC bus, and the second output end of the second new energy controller is electrically connected to the negative pole of the second DC bus; The positive pole of the third DC bus is electrically connected to the positive pole of the first DC bus, the neutral line of the third DC bus is electrically connected to the negative pole of the first DC bus and the positive pole of the second DC bus, the negative pole of the third DC bus is electrically connected to the negative pole of the second DC bus, and the positive pole of the third DC bus, the neutral line of the third DC bus and the negative pole of the third DC bus serve as the DC output end of the power supply system.
3. The system according to claim 1, characterized in that Also includes: A first monitoring module; The first monitoring module is communicatively connected to the communication port of each new energy controller via the field bus.
4. The system according to claim 3, characterized in that Also includes: L rectifier modules and a mains input unit corresponding to each rectifier module, wherein L is a positive integer; For each group of AC power input unit and rectifier module, the output end of the AC power input unit is electrically connected to the input end of the rectifier module, the first output end of the rectifier module is electrically connected to the positive pole of the DC bus, the second output end of the rectifier module is electrically connected to the negative pole of the DC bus, and the communication port of the rectifier module is electrically connected to the first monitoring module through a field bus.
5. The system according to claim 2, characterized in that Also includes a second monitoring module; The first communication port of the second monitoring module is communicatively connected to the first communication port of each first new energy controller and the first communication port of each second new energy controller through a field bus.
6. The system according to claim 5, characterized in that The second communication port of each first new energy controller and the second communication port of each second new energy controller are electrically connected via a voltage-sharing cable.
7. The system according to claim 5, characterized in that The second communication port of each first new energy controller and the second communication port of each second new energy controller are electrically connected via a synchronization cable.
8. The system according to claim 2, characterized in that Also includes a third monitoring module; The first communication port of the third monitoring module is respectively connected to the first communication port of each first new energy controller through the field bus, and the second communication port of the third monitoring module is respectively connected to the first communication port of each second new energy controller through the field bus.
9. The system according to any one of claims 4 to 8, characterized in that: The field bus is a CAN bus or an RS485 bus.
10. The system according to any one of claims 2, 5 to 8, characterized in that: The neutral conductor is grounded; or The neutral line is grounded with high resistance; or The neutral line is not grounded.