CN219937958U - Grid-connected and off-grid power supply system based on wind driven generator - Google Patents
Grid-connected and off-grid power supply system based on wind driven generator Download PDFInfo
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- CN219937958U CN219937958U CN202320842070.6U CN202320842070U CN219937958U CN 219937958 U CN219937958 U CN 219937958U CN 202320842070 U CN202320842070 U CN 202320842070U CN 219937958 U CN219937958 U CN 219937958U
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- 230000009466 transformation Effects 0.000 claims abstract description 26
- 238000010248 power generation Methods 0.000 claims abstract description 18
- 238000004146 energy storage Methods 0.000 claims description 92
- 230000009977 dual effect Effects 0.000 claims description 2
- 230000001276 controlling effect Effects 0.000 description 12
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- 230000009286 beneficial effect Effects 0.000 description 1
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- GELKBWJHTRAYNV-UHFFFAOYSA-K lithium iron phosphate Chemical compound [Li+].[Fe+2].[O-]P([O-])([O-])=O GELKBWJHTRAYNV-UHFFFAOYSA-K 0.000 description 1
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Abstract
The utility model discloses a grid-connected and off-grid power supply system based on a wind driven generator, which comprises: the wind power generation set is connected with the high-voltage power grid bus through a first transformation control module and connected with the load unit through a second transformation control module; and the output control component is used for controlling the electric energy output by the wind turbine to the load unit and/or the high-voltage power grid bus according to the power of the electric energy output by the wind turbine. Therefore, the electric energy output to the high-voltage grid bus and the load unit by the wind turbine generator can be flexibly adjusted, and the utilization rate of wind power is improved.
Description
Technical Field
The utility model relates to the technical field of wind power generation, in particular to a grid-connected and disconnected power supply system based on a wind power generator.
Background
With the development of new energy wind power generation, the installed capacity of wind power is rapidly increased, compared with centralized wind power, the development of a distributed wind power plant is not ideal at present, mainly because the grid structure of a distributed wind power access power grid is weak, the voltage level is low, meanwhile, due to the fluctuation and intermittence of the wind power system generation, the generated electric energy is not matched with the electric energy required by the power grid, and the utilization rate of wind power is not high.
Disclosure of Invention
The utility model provides a grid-connected-off power supply system based on a wind driven generator, which aims to solve the problem of fluctuation of wind power generation and improve the utilization rate of wind power.
In a first aspect, the present utility model provides an off-grid power supply system based on a wind driven generator, including: the wind power generation set is connected with the high-voltage power grid bus through a first transformation control module and connected with the load unit through a second transformation control module; and the output control component is used for controlling the electric energy output by the wind turbine to the load unit and/or the high-voltage power grid bus according to the power of the electric energy output by the wind turbine.
In some possible implementations, the output control assembly includes: the first controlled switch is connected between the wind turbine generator and the load unit; and the control unit is used for decoupling the output electric energy of the wind turbine, preferentially outputting the electric energy output by the wind turbine to the load unit and outputting the residual electric energy to the high-voltage grid bus.
In some possible embodiments, the power supply system further comprises: and the energy storage device is used for supplying power to the load unit when the output power of the wind turbine generator is smaller than the load power of the load unit.
In some possible embodiments, the input of the energy storage device is connected to the output of the second transformation module, and the output of the energy storage device is connected to the load unit.
In some possible implementations, the output control assembly further includes: the second controlled switch is arranged between the second transformation control module and the energy storage device; the control unit is also used for controlling the second controlled switch to be conducted when the power of the electric energy output by the wind turbine generator is larger than the preset charging power of the energy storage device; the preset charging power of the energy storage device is larger than the load power of the load unit.
In some possible embodiments, the input of the energy storage device is connected to the high-voltage grid busbar and the output of the energy storage device is connected to the load unit.
In some possible embodiments, the power supply system further comprises: the third transformation control module is arranged between the high-voltage power grid bus and the energy storage device and used for reducing the output voltage of the high-voltage power grid bus to the charging voltage of the energy storage device.
In some possible embodiments, the energy storage device is an energy storage battery pack with a dual battery system, including a first battery module and a second battery module, where the first battery module and the second battery module can alternately implement a charge and discharge function.
In some possible embodiments, the power supply system further comprises: the variable current module is arranged at the output end of the energy storage device and used for converting direct current output by the energy storage device into alternating current used by the load unit.
In some possible implementations, the output control assembly further includes: the third controlled switch is arranged between the energy storage device and the load unit; the control unit is also used for controlling the third controlled switch to be turned on when the first controlled switch is turned off, and controlling the third controlled switch to be turned off when the first controlled switch is turned on.
Compared with the prior art, the technical scheme provided by the utility model has the beneficial effects that:
in the utility model, the wind turbine generator is connected with the high-voltage power grid bus and the load unit through the first transformation control module and the second transformation control module respectively, and the output control module is used for controlling the electric energy output by the wind turbine generator to the load unit and the high-voltage power grid bus according to the power of the electric energy output by the wind turbine generator, so that the electric energy output by the wind turbine generator to the high-voltage power grid bus and the load unit can be flexibly regulated, thereby improving the utilization rate of wind power.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the disclosure.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the utility model and together with the description, serve to explain the principles of the utility model.
FIG. 1 is a schematic diagram of a grid-connected and grid-disconnected power supply system based on a wind driven generator in an embodiment of the utility model;
FIG. 2 is a schematic diagram of another grid-connected/disconnected power supply system based on a wind turbine in an embodiment of the present utility model;
FIG. 3 is a schematic diagram of another grid-connected/disconnected power supply system based on a wind turbine in an embodiment of the present utility model;
FIG. 4 is a schematic diagram of another grid-connected/disconnected power supply system based on a wind turbine in an embodiment of the present utility model;
FIG. 5 is a schematic diagram of another grid-connected/disconnected power supply system based on a wind turbine in an embodiment of the present utility model;
fig. 6 is a schematic structural diagram of a micro-grid system composed of a plurality of grid-separated power supply systems based on wind driven generators in an embodiment of the present utility model.
Detailed Description
In the following description, for purposes of explanation and not limitation, specific details are set forth such as the particular system architecture, techniques, etc., in order to provide a thorough understanding of the embodiments of the present utility model. It will be apparent, however, to one skilled in the art that the present utility model may be practiced in other embodiments that depart from these specific details. In other instances, detailed descriptions of well-known systems, devices, circuits, and methods are omitted so as not to obscure the description of the present utility model with unnecessary detail.
In order to illustrate the technical scheme of the utility model, the following description is made by specific examples.
Wind power generation refers to converting kinetic energy of wind into electrical energy. Wind energy is a clean and pollution-free renewable energy source, is used by people for a long time, is very environment-friendly by utilizing wind power, has huge wind energy accumulation, and is therefore increasingly valued in all countries of the world. The wind power generation is generally divided into grid-connected wind power generation and off-grid wind power generation, a grid-connected wind power generation fan is connected with a power grid, the single machine capacity is large, and electric energy generated by the fan is totally output to a high-voltage power grid for being used by loads connected into the power grid. Compared with grid-connected wind power generation, off-grid wind power generation is usually smaller in single-machine capacity, but has the advantages of low cost, flexible application, convenience in maintenance and the like. Therefore, the method is suitable for areas which cannot be effectively covered by the power grid such as pasture areas, forest areas, communication base stations, weather stations, islands, frontier sentry posts and the like. Off-grid wind power generation loads are usually located in close proximity to the wind turbine, and the electrical energy generated by the wind turbine is directly used to power the loads. With the development of new energy wind power generation, the installed capacity of wind power is rapidly increased. However, due to the fluctuation and intermittence of the wind power system, the wind power consumption is greatly slower than the installation speed, so that the wind abandoning problem is serious, the economy of a wind power plant is affected, and the enthusiasm of wind power investment is hit.
Compared with the centralized wind power, the development of the traditional distributed wind power plant is particularly undesirable, mainly because the grid structure of the distributed wind power access power grid is weak, the voltage level is low, and meanwhile, due to the fluctuation and intermittence of the power generation of the wind power system, the generated electric energy is not matched with the electric energy required by the power grid, and the utilization rate of the wind power is not high.
In order to solve the above-mentioned problems, an embodiment of the present utility model provides an off-grid power supply system based on a wind power generator, fig. 1 is a schematic structural diagram of an off-grid power supply system based on a wind power generator in an embodiment of the present utility model, and referring to fig. 1, the power supply system 10 may include: at least one wind turbine 11, wherein the wind turbine 11 is connected with a high-voltage power grid bus 13 through a first transformation control module 12, and the wind turbine 11 is connected with a load unit 15 through a second transformation control module 14; and the output control component 16 is used for controlling the electric energy output by the wind turbine 11 to the load unit 15 and/or the high-voltage grid bus 13 according to the power of the electric energy output by the wind turbine 11.
It can be understood that the electric energy output by the wind turbine generator 11 is directly output to the load unit 15, so as to supply power to the load unit 15, which is equivalent to off-grid power generation of the wind turbine generator 11. Meanwhile, the electric energy can be output to the high-voltage grid bus 13 while being output to the load unit 15, which is equivalent to realizing grid-connected power generation of the wind turbine generator 11.
In the embodiment of the utility model, the wind turbine generator system 11 respectively controls the electric energy output to the high-voltage power grid bus 13 and the load unit 15 through the output control component 16, so that the electric energy can be consumed in situ, and meanwhile, a certain economic benefit can be generated, and the utilization rate of the electric energy is improved.
It should be noted that, the output voltage of the electric energy output port of the wind turbine generator system 11 is usually 0.69kv, the output electric energy cannot be directly connected to the high-voltage power grid bus 13 or the load unit 15, and the electric energy output by the wind turbine generator system 11 needs to be transformed, so that the electric energy connected to the high-voltage power grid bus 13 or the load unit 15 meets the corresponding voltage requirement. For example, the switching voltage of the high-voltage grid bus 13 is typically 10kv or 35kv, and the switching voltage of the load unit 15 may be correspondingly adjusted according to the switching voltage requirement of the specific load unit 15. For example, the load unit 15 may be a communication base station, a data center, or the like, which is installed in the pasture area, the forest area, the weather station, the island, the frontier, or the like, or any other equipment requiring power supply. Therefore, in the embodiment of the present utility model, the primary function of the first transformation control module 12 and the second transformation control module 14 is to convert the voltage of the electric energy output by the wind turbine generator 11 into the access voltage corresponding to the high-voltage grid bus 13 and the access voltage corresponding to the load unit 15 respectively.
In some embodiments, controlling the power output by the wind turbine 11 to the high voltage grid bus 13 and the load unit 15 may be performed in the output control assembly 16. For example, referring also to fig. 1, the wind turbine generator 11 continuously generates electricity using wind energy, and the output electric energy first enters the output control component 16, and is decoupled in the output control component 16, and the output control component 16 outputs the output electric energy to the high-voltage grid bus 13 and the load unit 15 based on the power of the electric energy output by the wind turbine generator 11. Therefore, the electric energy output by the wind turbine generator system 11 to the high-voltage grid bus 13 and the load unit 15 can be flexibly adjusted, and the utilization rate of wind power is improved.
In some embodiments, output control assembly 16 may include: a first controlled switch 21 and a control unit 22; the first controlled switch 21 is connected between the wind turbine generator 11 and the load unit 15, and is used for controlling the wind turbine generator 11 to supply power to the load unit 15. The control unit 22 may be a functional module integrated in the output control assembly 16, and is configured to decouple the electrical energy output by the wind turbine 11, so that the electrical energy output by the wind turbine 11 is preferentially output to the load unit 15 according to the load power of the load unit 15, and the remaining electrical energy may be output to the high-voltage grid bus 13.
For example, the electric energy output by the wind turbine generator 11 may be decoupled, a part of stable electric energy output by the wind turbine generator 11 is output to the load unit 15, and the rest of electric energy is output to the high-voltage grid bus 13. Alternatively, the electric energy satisfying the load power of the load unit 15 may be output to the load unit 15 according to the load power of the load unit 15, and the surplus electric energy may be output to the high-voltage grid bus 13.
It can be understood that if the distributed wind turbine generator system 11 is connected to the high-voltage grid bus 13 only to realize grid-connected consumption, besides the problem of fluctuation of wind power, the wind turbine generator system 11 is usually arranged in a remote area and has a longer load distance from the power consumption on the grid-connected system, the loss on the power supply line is larger due to the longer power supply distance, and the actual utilization rate of the power is not high. Therefore, in order to increase the wind power utilization rate of the distributed wind turbine generator system 11, it is necessary to consume the electric energy as much as possible in situ, thereby reducing the loss on the power supply line. In the embodiment of the utility model, the electric energy output by the wind turbine generator 11 is preferentially output to the load unit 15 for consumption, the load unit 15 and the wind turbine generator 11 are arranged near, the power supply distance is short, and the electric energy utilization rate is high. Meanwhile, on the basis of meeting the requirement of supplying power to the load unit 15, the surplus electric energy is output to the high-voltage grid bus 13, so that certain economic benefits can be brought.
It can be appreciated that, when the wind turbine generator 11 is in normal operation, the output current directions are respectively directed to the high-voltage grid bus 13 and the load unit 15, and because of the fluctuation of the electric energy generated by the wind turbine generator 11, there may be a situation that the power of the electric energy output by the wind turbine generator 11 cannot meet the load power of the load unit 15, the wind turbine generator 11 cannot effectively supply power to the load unit 15, the electric energy cannot be output to the high-voltage grid bus 13, and even the high-voltage grid bus 13 reversely outputs the electric energy to the wind turbine generator 11, at this time, the wind turbine generator 11 is equivalent to becoming a motor, and there may be a situation that the electric energy in the power grid is reversely consumed. Based on this, in one possible implementation, the output control assembly 16 described above may also include an inverse power control.
Referring to fig. 2, fig. 2 is a schematic structural diagram of another grid-connected/disconnected power supply system based on a wind turbine according to an embodiment of the present utility model, where the output control assembly 16 includes a first controlled switch 21 and a control unit 22, and an inverse power control device 221 is disposed in the control unit 22.
The inverse power control device 221 may be a functional module integrated in the control unit 22, or may be a separate device connected to the control unit 22. For example, the reverse power control device 221 may be a reverse power controller, where the reverse power controller may disconnect the connection between the high-voltage grid bus 13 and the wind turbine 11 when detecting that there is a situation in which the high-voltage grid bus 13 outputs electric power to the wind turbine 11 in a reverse direction.
In some embodiments, the reverse power control device 221 may also simultaneously disconnect the first controlled switch 21 when disconnecting the high-voltage grid bus 13 from the wind turbine generator 11. Referring to fig. 2 as well, the wind turbine generator 11 is connected to the load unit 15 and the high-voltage grid bus 13 at the same time, when the output power of the wind turbine generator 11 does not meet the load power of the load unit 15, the load unit 15 may draw power from the high-voltage grid bus 13 through a path with the high-voltage grid bus 13, so as to ensure that the power supply of the load unit 15 is completely from the wind turbine generator 11, at this time, the inverse power control device 221 may output a control signal to disconnect the first controlled switch 21 at the same time when the connection between the high-voltage grid bus 13 and the wind turbine generator 11 is disconnected, and disconnect the load unit 15 from the whole power supply system.
It will be appreciated that, due to the fluctuation of the output power of the wind turbine 11, the first controlled switch 21 may be frequently turned off by the reverse power control device 221, for example, the power of the output power of the wind turbine 11 frequently fluctuates between the load power of the load unit 15 or more and the load power of the load unit 15 or less, which may cause the first controlled switch 21 to be frequently turned on or off by the reverse power control device 221, so that there is a possibility that the load unit 15 may be damaged by frequent power system impact, and therefore, in order to reduce the frequent opening and closing of the first controlled switch 21 and ensure the continuous power supply of the load unit 15, the power supply system 10 may further include an energy storage device 31, where the energy storage device 31 is used to supply the load unit 15 when the output power of the wind turbine 11 is less than the load power of the load unit 15.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another grid-connected power supply system based on a wind driven generator according to an embodiment of the present utility model, where an input end of an energy storage device 31 is connected to an output end of the second voltage transformation control module 14, and an output end of the energy storage device 31 is connected to the load unit 15.
It should be noted that, the energy storage device 31 may be an energy storage battery, and in order to ensure that the energy storage battery can provide power for the load unit 15 for a long time, the energy storage battery may be made of a battery material with a high energy density, for example, lithium iron phosphate with a large capacity and long-term energy storage, a flow battery, and the like.
It will be appreciated that the input of the energy storage device 31 is connected to the output of the second variable voltage control module 14, and that the energy storage device 31 is charged by the wind turbine 11. A controllable switch can be arranged between the load unit 15 and the energy storage device 31, and when the output power of the wind turbine generator 11 is smaller than the load power of the load unit 15, the controllable switch can be controlled to be closed to connect the output end of the energy storage device 31 with the load unit 15, and at the moment, the load unit 15 supplies power through the energy storage device 31.
It will be appreciated that, when the power fluctuation of the output electric energy of the wind turbine generator 11 is large, for example, referring to the schematic structural diagram of the power supply system 10 shown in fig. 2, when the power of the output electric energy of the wind turbine generator 11 frequently fluctuates between the load power of the load unit 15 and the load power of the load unit 15, the above-mentioned frequent output control signal of the inverse power control device 221 may control the first controlled switch 21 to be turned on or off, which not only results in that the wind turbine generator 11 cannot continuously supply the power to the load unit 15, but also may cause the equipment damage of the load unit 15 due to frequent power system impact. Therefore, in the embodiment of the present utility model, by providing the energy storage device 31 for the load unit 15, when the output power of the wind turbine generator 11 is smaller than the load power of the load unit 15 and cannot supply power to the load unit 15, the load unit 15 is compensated and supplied with power by the energy storage device 31, so that the load unit 15 can have continuous power supply, and meanwhile, the possibility of equipment damage of the load unit 15 is reduced.
In some embodiments, referring also to fig. 3, the output control assembly 16 may further include a second controlled switch 32, the second controlled switch 32 being disposed between the second variable voltage control module 14 and the energy storage device 31.
It will be appreciated that the energy storage device 31 is charged by the wind turbine 11, and that the control unit 22 may also be configured to control the second controlled switch 32 to be turned on or off, and to control the wind turbine 11 to charge the energy storage device 31, in case the output control assembly 16 includes the second controlled switch 32.
In some embodiments, the control unit 22 controls the second controlled switch 32 to be turned on when the power of the electric energy output by the wind turbine 11 is greater than the preset charging power of the energy storage device 31.
The preset charging power of the energy storage device 31 is greater than the load power of the load unit.
It can be appreciated that the wind turbine generator 11 preferentially supplies power to the load unit 15, the preset charging power of the energy storage device 31 is greater than the load power of the load unit 15, and when the electric energy output by the wind turbine generator 11 meets the preset charging power of the energy storage device, the energy storage device 31 is charged, so that the remaining electric energy can be used to charge the energy storage device 31 under the condition that the power supply to the load unit 15 is not influenced.
For example, the second controlled switch 32 may be a single-pole double-pole switch, through which the energy storage device 31 may be connected to the second voltage transformation control module 14 and the load unit 15, respectively, and when the electric energy output by the wind turbine 11 meets the preset charging power of the energy storage device 31, the switch is turned on to one end of the second voltage transformation control module 14, and at this time, the wind turbine 11 supplies power to the load unit 15 and simultaneously charges the energy storage device 31. When the electric energy output by the wind turbine generator system 11 meets the requirement of being smaller than the load power of the load unit 15, the switch can be conducted to one end of the load unit 15, and at the moment, the load unit 15 is powered by the energy storage device 31.
In other embodiments, the energy storage device 31 may also be connected to the high-voltage grid bus 13, and the energy storage device 31 is charged via the high-voltage grid bus 13.
Referring to fig. 4, fig. 4 is a schematic structural diagram of another grid-connected/disconnected power supply system based on a wind driven generator according to an embodiment of the present utility model, wherein an input end of an energy storage device 31 is connected to a high-voltage grid bus 13, and an output end of the energy storage device 31 is connected to a load unit 15.
It will be appreciated that the high-voltage grid bus 13 is capable of providing stable and efficient electrical energy, and charging the energy storage device 31 via the high-voltage grid bus 13, as compared to when the wind turbine generator 11 is in a full state, thereby providing more electrical energy to the load unit 15 in time when the power of the electrical energy output by the wind turbine generator is less than the load power of the load unit 15.
In some embodiments, the power supply system 10 may further include a third variable voltage control module 41.
The third transformation control module 41 is configured to step down the output voltage of the high-voltage power grid bus 13 to the charging voltage of the energy storage device 31, and the third transformation control module 41 may be a transformer. When the energy storage device 31 is charged by taking power from the high-voltage grid bus 13, since the high-voltage grid bus 13 generally provides high-voltage power, an excessively high voltage may not be suitable for charging the energy storage device 31, and even the energy storage device 31 may be easily damaged. Therefore, when the energy storage device 31 is charged through the high-voltage power grid bus 13, a transformer may be disposed between the energy storage device 31 and the high-voltage power grid bus 13 to reduce the voltage of the high-voltage power output by the high-voltage power grid bus 13 to meet the charging voltage of the energy storage device 31, so as to ensure the charging stability of the energy storage device 31.
In some embodiments, the energy storage device 31 is an energy storage battery pack with a dual-battery system, and includes a first battery module and a second battery module, where the first battery module and the second battery module can alternately implement a charge and discharge function.
As can be appreciated, when the energy storage device 31 is charged through the high-voltage power grid bus 13, the energy storage battery pack adopting the dual-battery system can charge one battery module while supplying power to the load unit 15, and the two battery modules are alternately charged and discharged, so that the time period when the energy storage device 31 supplies power to the load unit 15 is improved to the maximum extent, and the continuous power supply of the load unit 15 is ensured.
It can be appreciated that, when the energy storage device 31 is an energy storage battery, since the electric energy output by the energy storage battery is usually direct current, when the power required by the load unit 15 is alternating current, the electric energy provided by the energy storage battery cannot be directly used by the load unit 15, and therefore, referring to fig. 5, the power supply system 10 may further include a current transformation module 51. The current transformation module 51 is disposed at an output end of the energy storage device 31, and is configured to convert the direct current output by the energy storage device 31 into the alternating current for the load unit 15.
In other embodiments, the output control assembly 16 may further include a third controlled switch 52 for controlling the energy storage device 31 to supply power to the load unit 15.
Referring also to fig. 5, the third controlled switch 52 is disposed between the energy storage device 31 and the load unit 15, and at this time, in order to realize automatic control of the third controlled switch 52, the control unit 22 may further output a signal for controlling to turn on to control the third controlled switch 52 to turn on when the first controlled switch 21 is turned off, and output a control signal for controlling to turn off to control the third controlled switch 52 to turn off when the first controlled switch 21 is turned on.
For example, when the power of the electric energy output by the wind turbine generator 11 is smaller than the load power of the load unit 15, the control unit 22 controls the first controlled switch 21 to be turned off, and at this time, the load unit 15 needs to be powered by the energy storage device 31, the control unit 22 outputs a turned-on control signal to the third controlled switch 52, the third controlled switch 52 is turned on, and the load unit 15 is powered by the energy storage device 31. When the power of the electric energy output by the wind turbine generator system 11 is greater than or equal to the load power of the load unit 15, the control unit controls the first controlled switch 21 to be turned on, at this time, the load unit 15 directly supplies power through the wind turbine generator system 11, the control unit 22 outputs an off control signal to the third controlled switch 52, the third controlled switch 52 is turned off, and the load unit 15 directly supplies power through the wind turbine generator system 11.
In the embodiment of the utility model, the output control component 16 controls the electric energy output by the wind turbine generator 11 to the load unit 15 and the high-voltage power grid bus 13 according to the power of the electric energy output by the wind turbine generator 11, the electric energy output by the wind turbine generator 11 preferentially supplies power to the load unit 15, and the redundant electric energy is output to the high-voltage power grid bus 13. Therefore, the electric energy output by the wind turbine generator system 11 can be ensured to stably supply power to the load unit 15, the problem of on-site wind power consumption is solved while the fluctuation of wind power supply is reduced, and the utilization rate of wind power is improved.
In some embodiments, the power supply system 10 may be connected to one or more other power supply systems 10 with the same structure, and together form a micro-grid power supply system.
Referring to fig. 6, fig. 6 is a schematic structural diagram of a micro grid system 60 composed of a plurality of off-grid power supply systems based on wind power generators according to an embodiment of the present utility model.
The micro-grid system 60 includes N wind turbines, which are respectively represented by wind turbine 1 to wind turbine N, each wind turbine is respectively connected with a load unit, and N load units are respectively represented by load unit 1 to load unit N. Each wind turbine generator system outputs the output electric energy to a corresponding load unit and a high-voltage power grid bus 601, and the electric energy output to the high-voltage power grid bus 601 can supply power to M loads connected to the high-voltage power grid bus 601, wherein the M loads are respectively represented by loads 1 to M. Wherein, the values of N and M are integers greater than 0. The connection mode of each wind turbine generator and the corresponding load unit and the high-voltage grid bus 601 can be the same as that of the off-grid and on-grid power supply system of the single wind driven generator. Or the electric energy output to the high-voltage electric network bus 601 can be integrated and then can be integrated into the large electric network 602. Meanwhile, an energy storage battery 603 is further arranged on the micro-grid system 60, the input end of the energy storage battery 603 is connected with the high-voltage grid bus 601, electric energy provided by the high-voltage grid bus 601 is used for charging, and the third transformation control module 41 and the switch 6031 are arranged between the input end of the energy storage battery 603 and the high-voltage grid bus 601. The output terminals of the energy storage battery 603 are respectively connected with N load units through N switches, wherein the N switches are respectively connected with S 1 To S N And (3) representing. When the power of the electric energy output by any wind turbine generator is smaller than the load power of the corresponding load unit, the corresponding load unit supplies power through the energy storage battery 603.
In the embodiment of the utility model, the output control component is used for controlling the electric energy output by the wind turbine to the load unit and the high-voltage power grid bus according to the power of the electric energy output by the wind turbine, the electric energy output by the wind turbine is preferentially used for supplying power to the load unit, and meanwhile, the redundant electric energy is output to the high-voltage power grid bus. Therefore, the electric energy output by the wind turbine generator can be stably supplied to the load unit, the fluctuation of wind power supply is reduced, the problem of on-site consumption of wind power is solved, and the utilization rate of the wind power is improved.
Other embodiments of the utility model will be apparent to those skilled in the art from consideration of the specification and practice of the utility model disclosed herein. This utility model is intended to cover any variations, uses, or adaptations of the utility model following, in general, the principles of the utility model and including such departures from the present disclosure as come within known or customary practice within the art to which the utility model pertains. It is intended that the specification and examples be considered as exemplary only, with a true scope and spirit of the utility model being indicated by the following claims.
It is to be understood that the utility model is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the utility model is limited only by the appended claims.
Claims (10)
1. Grid-connected and off-grid power supply system based on wind driven generator is characterized by comprising:
the wind power generation set is connected with the high-voltage power grid bus through a first transformation control module, and is connected with the load unit through a second transformation control module;
and the output control component is used for controlling the electric energy output by the wind turbine to the load unit and/or the high-voltage power grid bus according to the power of the electric energy output by the wind turbine.
2. The power supply system of claim 1, wherein the output control assembly comprises:
the first controlled switch is connected between the wind turbine generator and the load unit;
the control unit is used for decoupling the electric energy output by the wind turbine, preferentially outputting the electric energy output by the wind turbine to the load unit according to the load power of the load unit, and outputting the residual electric energy to the high-voltage power grid bus.
3. The power supply system of claim 2, further comprising:
the energy storage device is used for supplying power to the load unit when the output power of the wind turbine generator is smaller than the load power of the load unit.
4. A power supply system according to claim 3, wherein the input of the energy storage device is connected to the output of the second variable-voltage control module, and the output of the energy storage device is connected to the load unit.
5. The power supply system of claim 3, wherein the output control assembly further comprises:
the second controlled switch is arranged between the second transformation control module and the energy storage device;
the control unit is further used for controlling the second controlled switch to be conducted when the power of the electric energy output by the wind turbine generator is larger than the preset charging power of the energy storage device; the preset charging power of the energy storage device is larger than the load power of the load unit.
6. A power supply system according to claim 3, wherein the input of the energy storage device is connected to the high voltage grid bus and the output of the energy storage device is connected to the load unit.
7. The power supply system of claim 6, further comprising:
the third transformation control module is arranged between the high-voltage power grid bus and the energy storage device and used for reducing the output voltage of the high-voltage power grid bus to the charging voltage of the energy storage device.
8. The power supply system of claim 7, wherein the energy storage device is an energy storage battery pack having a dual battery system, and comprises a first battery module and a second battery module, and the first battery module and the second battery module are capable of alternately implementing a charge-discharge function.
9. The power supply system according to any one of claims 3 to 8, characterized in that the power supply system further comprises:
the current transformation module is arranged at the output end of the energy storage device and used for converting direct current output by the energy storage device into alternating current used by the load unit.
10. The power supply system of claim 9, wherein the output control assembly further comprises:
a third controlled switch disposed between the energy storage device and the load unit;
the control unit is further used for controlling the third controlled switch to be turned on when the first controlled switch is turned off, and controlling the third controlled switch to be turned off when the first controlled switch is turned on.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320842070.6U CN219937958U (en) | 2023-04-14 | 2023-04-14 | Grid-connected and off-grid power supply system based on wind driven generator |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202320842070.6U CN219937958U (en) | 2023-04-14 | 2023-04-14 | Grid-connected and off-grid power supply system based on wind driven generator |
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