Photovoltaic power supply system
By introducing DC bus, photovoltaic modules and DC voltage conversion devices into the photovoltaic power supply system, the adaptation of a variety of power supply scenarios is achieved, the cost and volume increase caused by multiple DC-DC converters in the prior art is solved, and a more efficient power supply method is achieved.
Patent Information
- Application Number
- CN202421624361.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-07-09
- Publication Date
- 2025-07-22
- Estimated Expiration
- 2034-07-09
AI Technical Summary
Existing photovoltaic power supply systems require multiple DC-DC converters in charging stations to adapt to different power supply scenarios, resulting in increased system cost and volume.
Design a photovoltaic power supply system to achieve the adaptation of multiple power supply scenarios through the combination of DC bus, photovoltaic modules, DC voltage conversion device and charging interface, including photovoltaic modules to vehicles with DC bus and charging interfaces.
Reduces the number of devices required by the system, reduces the cost and volume occupied, and improves the flexibility and efficiency of the system.
Smart Images
Figure CN223141519U_ABST
Abstract
Description
Technical Field
[0001] The present disclosure relates to the field of power technologies, and in particular, to a photovoltaic power supply system. Background Art
[0002] With the increase in electric vehicles, the demand for charging stations for charging electric vehicles has gradually increased. Currently, electric energy is usually provided by a bus bar, and the electric energy is provided to the vehicles connected to the charging station through a DC-DC (DC-DC converter, direct current-direct current converter). Among them, the electric energy of the DC bus bar can come from the distribution network or from photovoltaic devices. When the photovoltaic device is the provider of the electric energy of the bus bar, the photovoltaic module can be transmitted to the bus bar through another DC-DC to provide electric energy for the bus bar. Summary of the Utility Model
[0003] The purpose of the present disclosure is to provide a photovoltaic power supply system.
[0004] To achieve the above purpose, the present disclosure provides a photovoltaic power supply system, including: a DC bus bar, a photovoltaic module, a DC voltage conversion device, and a charging interface;
[0005] The photovoltaic module is connected to the DC bus bar and is used to provide electric energy for the DC bus bar;
[0006] The DC voltage conversion device is respectively connected to the DC bus bar and the charging interface, and is used to output the electric energy of the DC bus bar to the vehicle connected to the charging interface;
[0007] The photovoltaic module is also connected to the DC voltage conversion device and is used to output the electric energy of the photovoltaic module to the vehicle connected to the charging interface.
[0008] Optionally, the DC voltage conversion device includes a primary circuit, and the primary circuit is respectively connected to the photovoltaic module and the DC bus bar;
[0009] The photovoltaic power supply system further includes a controller, which is connected to the primary circuit;
[0010] The controller is used to control the primary circuit to receive the electric energy of the photovoltaic module and control the primary circuit to transmit the electric energy received from the photovoltaic module to the DC bus bar when the first condition is satisfied, so that the photovoltaic module provides electric energy for the DC bus bar.
[0011] Optionally, the primary circuit includes a first inductor, a first bridge arm, a second inductor, and a second bridge arm. A first power switch is arranged at the upper end of the first bridge arm, a second power switch is arranged at the lower end of the first bridge arm, a third power switch is arranged at the upper end of the second bridge arm, and a fourth power switch is arranged at the lower end of the second bridge arm;
[0012] The first end of the first inductor is connected to the positive electrode of the photovoltaic module, and the second end of the first inductor is connected to the midpoint of the first arm; the controller is respectively connected to the control electrodes of the first power switch, the second power switch, the third power switch, and the fourth power switch.
[0013] Optionally, when the first condition is satisfied, the controller is configured to periodically send a first control signal to the first power switch and the third power switch synchronously, and periodically send a first complementary control signal complementary to the first control signal to the second power switch and the fourth power switch synchronously, so as to enable the photovoltaic module to supply electric energy to the DC bus by controlling the primary circuit.
[0014] Optionally, the DC voltage conversion device further includes a transformer and a secondary circuit, and the transformer includes a primary winding and a secondary winding;
[0015] The input end of the primary winding of the transformer is connected to the energy output end of the primary circuit, the output end of the secondary winding of the transformer is connected to the energy input end of the secondary circuit, and the energy output end of the secondary circuit is connected to the charging interface;
[0016] The controller is further configured to control the primary circuit to receive electric energy from the photovoltaic module and / or the bus when the second condition is satisfied, and enable the secondary circuit to supply electric energy to the charging interface by controlling the primary circuit and the secondary circuit; and / or,
[0017] The controller is further configured to control the primary circuit to receive electric energy from the photovoltaic module when the third condition is satisfied, and enable the primary circuit to supply electric energy to the bus and enable the secondary circuit to supply electric energy to the charging interface by controlling the primary circuit and the secondary circuit.
[0018] Optionally, the secondary circuit includes a third inductor, a third arm, and a fourth arm. A fifth power switch is arranged at the upper end of the third arm, a sixth power switch is arranged at the lower end of the third arm, a seventh power switch is arranged at the upper end of the fourth arm, and an eighth power switch is arranged at the lower end of the fourth arm;
[0019] The first end of the third inductor is connected to the first output end of the secondary winding, and the second end of the third inductor is connected to the midpoint of the third bridge arm; the second output end of the secondary winding is connected to the midpoint of the fourth bridge arm; the output poles of the fifth power switch and the seventh power switch are connected to the positive pole of the charging interface, and the input poles of the sixth power switch and the eighth power switch are connected to the negative pole of the charging interface; the controller is further connected to the control poles of the fifth power switch, the sixth power switch, the seventh power switch, and the eighth power switch respectively.
[0020] Optionally, when the second condition is satisfied, the controller is configured to periodically and synchronously send a second control signal to the first power switch, the fourth power switch, the fifth power switch, and the eighth power switch, and periodically and synchronously send a second complementary control signal complementary to the second control signal to the second power switch, the third power switch, the sixth power switch, and the seventh power switch, so as to supply electrical energy to the charging interface through the photovoltaic module and / or the DC bus.
[0021] Optionally, when the third condition is satisfied, the controller is configured to periodically and synchronously send a third control signal to the first power switch and a fourth control signal to the third power switch, and periodically send a third complementary control signal complementary to the third control signal to the second power switch and a fourth complementary control signal complementary to the fourth control signal to the fourth power switch, and periodically send a fifth control signal to the fifth power switch and a sixth control signal to the seventh power switch, and periodically send a fifth complementary control signal complementary to the fifth control signal to the sixth power switch and a sixth complementary control signal complementary to the sixth control signal to the eighth power switch;
[0022] wherein, the third control signal and the fourth control signal have a first phase difference, and the fifth control signal and the sixth control signal have a second phase difference.
[0023] Optionally, a target capacitor is provided between the second output end of the secondary winding and the midpoint of the fourth bridge arm;
[0024] When the third condition is satisfied, the controller is configured to periodically and synchronously send a seventh control signal to the first power switch, the fifth power switch, and the seventh power switch, and send an eighth control signal to the third power switch, and periodically send a seventh complementary control signal complementary to the seventh control signal to the second power switch, the sixth power switch, and the eighth power switch, and send an eighth complementary control signal complementary to the eighth control signal to the fourth power switch;
[0025] Among them, the seventh control signal and the eighth control signal have a third phase difference and a preset frequency difference.
[0026] Optionally, a first switch module is disposed between the photovoltaic module and the DC voltage conversion device, and the first switch module is configured to conduct or disconnect the circuit between the photovoltaic module and the DC voltage conversion device;
[0027] A second switch module is disposed between the DC voltage conversion device and the charging interface, and the second switch module is configured to conduct or disconnect the circuit between the DC voltage conversion device and the charging interface.
[0028] Through the above technical solution, a DC bus, a photovoltaic module, a DC voltage conversion device, and a charging interface are provided in the photovoltaic power supply system. Among them, the photovoltaic module is connected to the DC bus to provide power for the DC bus. The DC voltage conversion device is respectively connected to the DC bus and the charging interface to output the power of the DC bus to a vehicle connected to the charging interface. The photovoltaic module is also connected to the DC voltage conversion device to output the power of the photovoltaic module to a vehicle connected to the charging interface. Thus, through the DC voltage conversion device, by connecting the photovoltaic module, the DC bus, and the charging interface respectively, power supply from the photovoltaic module to the DC bus can be achieved, power supply from the photovoltaic module to a vehicle connected to the charging interface can also be achieved, and power supply from the DC bus to a vehicle connected to the charging interface can also be achieved. In this way, only one DC voltage conversion device needs to be provided, which can be applied to multiple different power supply scenarios. Compared with the current method of respectively using different DC-DC to match different power supply scenarios, the photovoltaic power supply system of the present disclosure requires fewer devices, which is beneficial to reducing the cost and occupied volume of the system.
[0029] Other features and advantages of the present disclosure will be described in detail in the subsequent specific implementation section. BRIEF DESCRIPTION OF THE DRAWINGS
[0030] The drawings are used to provide a further understanding of the present disclosure, and constitute a part of the specification. They are used to explain the present disclosure together with the following specific implementation, but do not constitute a limitation to the present disclosure. In the drawings:
[0031] Figure 1 is a schematic diagram of a photovoltaic power supply system shown according to an exemplary embodiment of the present disclosure;
[0032] Figure 2 is a specific circuit schematic diagram of a photovoltaic power supply system shown according to an exemplary embodiment of the present disclosure;
[0033] Figure 3It is a schematic diagram of exemplary control signals of each power switch when a photovoltaic module supplies power to a DC bus in a photovoltaic power supply system according to an exemplary embodiment of the present disclosure;
[0034] Figure 4 It is a schematic diagram of exemplary control signals of each power switch when a photovoltaic module and / or a DC bus supplies power to a charging interface in a photovoltaic power supply system according to an exemplary embodiment of the present disclosure;
[0035] Figure 5 It is a schematic diagram of a specific circuit of a photovoltaic power supply system according to another exemplary embodiment of the present disclosure;
[0036] Figure 6 It is a schematic diagram of exemplary control signals of each power switch when a photovoltaic module supplies power to a DC bus and a charging interface in a photovoltaic power supply system according to an exemplary embodiment of the present disclosure;
[0037] Figure 7 It is a schematic diagram of a photovoltaic power supply system according to another exemplary embodiment of the present disclosure;
[0038] Figure 8 It is a schematic diagram of a photovoltaic power supply system according to another exemplary embodiment of the present disclosure.
[0039] Description of Reference Numerals
[0040] DC bus 100, Photovoltaic module 200, DC voltage conversion device 300
[0041] Charging interface 400, Primary circuit 310, Controller 500
[0042] First inductor L1, First bridge arm B1, Second inductor L2
[0043] Second bridge arm B2, First power switch Q1, Second power switch Q2
[0044] Third power switch Q3, Fourth power switch Q4, Transformer 320
[0045] Secondary circuit 330, Primary winding 321, Secondary winding 322
[0046] Third inductor L3, Third bridge arm B3, Fourth bridge arm B4
[0047] Fifth power switch Q5, Sixth power switch Q6, Seventh power switch Q7
[0048] Eighth power switch Q8, Target capacitor C3, First switch module 600
[0049] Second switch module 700 Detailed Description of the Invention
[0050] The following will describe in detail the specific embodiments of the present disclosure with reference to the accompanying drawings. It should be understood that the specific embodiments described herein are only for the purpose of illustration and explanation of the present disclosure, and are not intended to limit the present disclosure.
[0051] Figure 1 is a schematic diagram of a photovoltaic power supply system shown according to an exemplary embodiment of the present disclosure. As Figure 1 shown, the photovoltaic power supply system provided by the present disclosure may include: a DC bus 100, a photovoltaic module 200, a DC voltage conversion device 300, and a charging interface 400. Among them:
[0052] The photovoltaic module 200 is connected to the DC bus 100 and is used to supply electrical energy to the DC bus 100;
[0053] The DC voltage conversion device 300 is respectively connected to the DC bus 100 and the charging interface 400, and is used to output the electrical energy of the DC bus 100 to a vehicle connected to the charging interface 400;
[0054] The photovoltaic module 200 is also connected to the DC voltage conversion device 300 and is used to output the electrical energy of the photovoltaic module 200 to a vehicle connected to the charging interface 400.
[0055] Through the above technical solutions, a DC bus, a photovoltaic module, a DC voltage conversion device, and a charging interface are provided in the photovoltaic power supply system. Among them, the photovoltaic module is connected to the DC bus to supply electrical energy to the DC bus. The DC voltage conversion device is respectively connected to the DC bus and the charging interface to output the electrical energy of the DC bus to a vehicle connected to the charging interface. The photovoltaic module is also connected to the DC voltage conversion device to output the electrical energy of the photovoltaic module to a vehicle connected to the charging interface. Thus, through the DC voltage conversion device, connecting the photovoltaic module, the DC bus, and the charging interface respectively, it is possible to achieve power supply from the photovoltaic module to the DC bus, and it is also possible to achieve power supply from the photovoltaic module to a vehicle connected to the charging interface, and it is also possible to achieve power supply from the DC bus to a vehicle connected to the charging interface. In this way, only one DC voltage conversion device needs to be set, which can be applied to a variety of different power supply scenarios. Compared with the current method of respectively using different DC-DC to match different power supply scenarios, the photovoltaic power supply system of the present disclosure requires fewer devices to be set, which is beneficial to reducing the cost and occupied volume of the system.
[0056] Optionally, the DC voltage conversion device 300 may include a primary circuit 310, and the primary circuit 310 is respectively connected to the photovoltaic module 200 and the DC bus 100.
[0057] The photovoltaic power supply system may further include a controller 500, which is connected to the primary circuit 310.
[0058] The controller 500 can be used to control the primary circuit 310 to receive electrical energy from the photovoltaic module 200 when a first condition is met, and control the primary circuit 310 to transmit the electrical energy received from the photovoltaic module 200 to the DC bus 100, so that the photovoltaic module 200 supplies electrical energy to the DC bus 100.
[0059] In this embodiment, substantially through the setting of the primary circuit 310, the photovoltaic module 200 supplies electrical energy to the DC bus 100.
[0060] In a possible embodiment, as Figure 2 shown, the primary circuit 310 may include a first inductor L1, a first bridge arm B1, a second inductor L2, and a second bridge arm B2. A first power switch Q1 is arranged at the upper end of the first bridge arm B1, a second power switch Q2 is arranged at the lower end of the first bridge arm B1, a third power switch Q3 is arranged at the upper end of the second bridge arm B2, and a fourth power switch Q4 is arranged at the lower end of the second bridge arm B2.
[0061] A first end of the first inductor L1 is connected to the positive electrode of the photovoltaic module 200, and a second end of the first inductor L1 is connected to the midpoint of the first bridge arm B1; a first end of the second inductor L2 is connected to the positive electrode of the photovoltaic module 200, and a second end of the second inductor L2 is connected to the midpoint of the second bridge arm B2; the output poles of the first power switch Q1 and the third power switch Q3 are connected to the positive electrode of the DC bus 100, and the input poles of the second power switch Q2 and the fourth power switch Q4 are connected to the negative electrode of the DC bus 100 and the negative electrode of the photovoltaic module 200; the controller 500 is respectively connected to the control poles of the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4.
[0062] Wherein, the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 can be IGBTs (Insulated Gate Bipolar Transistors) or MOSFETs (Metal - Oxide - Semiconductor Field - Effect Transistors).
[0063] If the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 are IGBTs, then the above - mentioned control pole is the gate, the input pole is the emitter, and the output pole is the collector.
[0064] If the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 are MOSFETs, then the above - mentioned control pole is the gate, the input pole is the source, and the output pole is the drain.
[0065] In a possible embodiment, the controller 500 can be used to periodically send a first control signal to the first power switch Q1 and the third power switch Q3 synchronously when a first condition is satisfied, and periodically send a first complementary control signal complementary to the first control signal to the second power switch Q2 and the fourth power switch Q4 synchronously, so as to enable the photovoltaic module 200 to supply electrical energy to the DC bus 100 by controlling the primary circuit 310.
[0066] Wherein, the satisfaction of the first condition can be the condition corresponding to the need to supply power to the DC bus 100 through the photovoltaic module 200, and the first condition can be set according to actual requirements. For example, the first condition can be set to be during the peak power consumption period. For another example, the first condition can be set to be that the sunlight intensity reaches a specified threshold.
[0067] When the first condition is satisfied, the controller 500 can periodically send a first control signal to the first power switch Q1 and the third power switch Q3 synchronously. Optionally, the controller 500 can generate control parameters that can meet the power supply requirement according to the power supply requirement, and then generate a corresponding control signal based on the determined control parameters as the first control signal. At the same time, a signal complementary to the first signal, that is, the first complementary signal, is generated as the control signal for the second power switch Q2 corresponding to the first power switch Q1 and the fourth power switch Q4 corresponding to the third power switch Q3. Wherein, the control parameters can include but are not limited to at least one of duty cycle, frequency, and phase, and the control signal can be a PWM (Pulse Width Modulation) signal. Exemplarily, the control timing diagrams for the first power switch Q1, the second power switch Q2, the third power switch Q3, and the fourth power switch Q4 can be as Figure 3 shown, that is, the duty cycle of the first control signal is 50%.
[0068] In this embodiment, only the primary circuit 310 needs to be used. Therefore, the remaining part of the circuit on the right side of the primary circuit 310 can be in an open state.
[0069] Optionally, the DC voltage conversion device 300 can further include a transformer 320 and a secondary circuit 330. The transformer 320 includes a primary winding 321 and a secondary winding 322. Wherein:
[0070] The input end of the primary winding 321 of the transformer 320 is connected to the energy output end of the primary circuit 310, the output end of the secondary winding of the transformer 320 is connected to the energy input end of the secondary circuit 330, and the energy output end of the secondary circuit 330 is connected to the charging interface 400;
[0071] The primary circuit 310 is used to obtain initial energy from the photovoltaic module 200 and / or the DC bus 100, and send the initial energy into the primary winding 321 of the transformer 320;
[0072] The secondary winding of the transformer 320 is used to transform the initial energy, and transmit the intermediate energy obtained after transformation to the secondary circuit 330;
[0073] The secondary circuit 330 is used to process the intermediate energy to obtain output electric energy, and output the electric energy to the charging interface 400.
[0074] Based on this, the controller 500 can also be used for:
[0075] When the second condition is satisfied, control the primary circuit 310 to receive the electric energy of the photovoltaic module 200 and / or the bus, and make the secondary circuit 330 provide electric energy for the charging interface 400 by controlling the primary circuit 310 and the secondary circuit 330;
[0076] When the third condition is satisfied, control the primary circuit 310 to receive the electric energy of the photovoltaic module 200, and make the primary circuit 310 provide electric energy for the bus and make the secondary circuit 330 provide electric energy for the charging interface 400 by controlling the primary circuit 310 and the secondary circuit 330.
[0077] The second condition is the condition for supplying power to the charging interface 400 (that is, the vehicle connected to the charging interface 400) through the photovoltaic module 200 and / or the DC bus 100, and the second condition can be set according to actual requirements. For example, the second condition can be set that there is a vehicle connected to the charging interface 400.
[0078] The third condition can be the condition for supplying power to the DC bus 100 and the charging interface 400 (that is, the vehicle connected to the charging interface 400) through the photovoltaic module 200, and the third condition can be set according to actual requirements. For example, the third condition can be that it is during the peak electricity consumption period and there is a vehicle connected to the charging interface.
[0079] In a possible embodiment, the secondary circuit 330 may include a third inductor L3, a third bridge arm B3 and a fourth bridge arm B4. A fifth power switch Q5 is arranged at the upper end of the third bridge arm B3, a sixth power switch Q6 is arranged at the lower end of the third bridge arm B3, a seventh power switch Q7 is arranged at the upper end of the fourth bridge arm B4, and an eighth power switch Q8 is arranged at the lower end of the fourth bridge arm B4.
[0080] The first end of the third inductor L3 is connected to the first output end of the secondary winding, and the second end of the third inductor L3 is connected to the midpoint of the third bridge arm B3; the second output end of the secondary winding is connected to the midpoint of the fourth bridge arm B4; the output poles of the fifth power switch Q5 and the seventh power switch Q7 are connected to the positive pole of the charging interface 400, and the input poles of the sixth power switch Q6 and the eighth power switch Q8 are connected to the negative pole of the charging interface 400; the controller 500 is further connected to the control poles of the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 respectively.
[0081] Among them, the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 can be IGBTs or MOSFETs.
[0082] If the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 are IGBTs, then the above control pole is the gate, the input pole is the emitter, and the output pole is the collector.
[0083] If the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 are MOSFETs, then the above control pole is the gate, the input pole is the source, and the output pole is the drain.
[0084] When the second condition is satisfied, the controller 500 can be used to periodically send a second control signal to the first power switch Q1, the fourth power switch Q4, the fifth power switch Q5, and the eighth power switch Q8 synchronously, and periodically send a second complementary control signal complementary to the second control signal to the second power switch Q2, the third power switch Q3, the sixth power switch Q6, and the seventh power switch Q7 synchronously, so as to supply electrical energy to the charging interface 400 through the photovoltaic module 200 and / or the DC bus 100.
[0085] Through the above control of the controller 500, the first power switch Q1, the second power switch Q2, the third power switch Q3, the fourth power switch Q4, the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 can supply power from the DC bus 100 and / or the photovoltaic module 200 to the charging interface 400 (that is, the vehicle connected to the charging interface 400) during the switching of the on / off states of the power switches. Exemplarily, in this embodiment, the control timing diagram for the first power switch Q1, the second power switch Q2, the third power switch Q3, the fourth power switch Q4, the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 can be as Figure 4 shown.
[0086] When the third condition is satisfied, the controller 500 can be used to periodically and synchronously send a third control signal to the first power switch Q1 and a fourth control signal to the third power switch Q3, and periodically send a third complementary control signal complementary to the third control signal to the second power switch Q2 and a fourth complementary control signal complementary to the fourth control signal to the fourth power switch Q4, and periodically send a fifth control signal to the fifth power switch Q5 and a sixth control signal to the seventh power switch Q7, and periodically send a fifth complementary control signal complementary to the fifth control signal to the sixth power switch Q6 and a sixth complementary control signal complementary to the sixth control signal to the eighth power switch Q8. Among them, the third control signal and the fourth control signal have a first phase difference, and the fifth control signal and the sixth control signal have a second phase difference.
[0087] Through the above control of the controller 500, through the first phase difference between the third control signal and the fourth control signal, the conversion between the voltage of the photovoltaic module 200 and the voltage of the DC bus 100 can be achieved, and through the second phase difference between the fifth control signal and the sixth control signal, the conversion between the voltage of the photovoltaic module 200 and the voltage of the charging interface 400 (i.e., the charging voltage of the vehicle connected to the charging interface 400) can be achieved. Thus, the power supply from the photovoltaic module 200 to the DC bus 100 and the charging interface 400 can be realized.
[0088] Optionally, as Figure 5 shown, a target capacitor C3 can be provided between the second output terminal of the secondary winding and the midpoint of the fourth bridge arm B4.
[0089] Based on this, the controller 500 can be used to, when the third condition is satisfied, periodically and synchronously send a seventh control signal to the first power switch Q1, the fifth power switch Q5, and the seventh power switch Q7, and send an eighth control signal to the third power switch Q3, and periodically send a seventh complementary control signal complementary to the seventh control signal to the second power switch Q2, the sixth power switch Q6, and the eighth power switch Q8, and send an eighth complementary control signal complementary to the eighth control signal to the fourth power switch Q4. Among them, the seventh control signal and the eighth control signal have a third phase difference and a preset frequency difference.
[0090] Through the above control of the controller 500, through the first phase difference between the seventh control signal and the eighth control signal, the conversion between the voltage of the photovoltaic module 200 and the voltage of the DC bus 100 can be achieved, and through the preset frequency difference between the seventh control signal and the eighth control signal, the conversion between the voltage of the photovoltaic module 200 and the voltage of the charging interface 400 (i.e., the charging voltage of the vehicle connected to the charging interface 400) can be achieved. Thus, the power supply from the photovoltaic module 200 to the DC bus 100 and the charging interface 400 can be realized. By way of example, in this embodiment, the control timing diagrams of the first power switch Q1, the second power switch Q2, the third power switch Q3, the fourth power switch Q4, the fifth power switch Q5, the sixth power switch Q6, the seventh power switch Q7, and the eighth power switch Q8 can be as Figure 6 shown.
[0091] Optionally, a first switch module 600 may be provided between the photovoltaic module 200 and the DC voltage conversion device 300. The first switch module 600 is used to conduct or disconnect the circuit between the photovoltaic module 200 and the DC voltage conversion device 300. By way of example, the controller 500 can control the on / off of the first switch module 600 to conduct or disconnect the circuit between the photovoltaic module 200 and the DC voltage conversion device 300. When the circuit between the photovoltaic module 200 and the DC voltage conversion device 300 is disconnected, the photovoltaic module 200 will not supply power outward.
[0092] Optionally, a second switch module 700 may be provided between the DC voltage conversion device 300 and the charging interface 400. The second switch module 700 is used to conduct or disconnect the circuit between the DC voltage conversion device 300 and the charging interface 400. By way of example, the controller 500 can control the on / off of the second switch module 700 to conduct or disconnect the circuit between the DC voltage conversion device 300 and the charging interface 400. When the circuit between the DC voltage conversion device 300 and the charging interface 400 is disconnected, the charging interface 400 cannot supply power outward.
[0093] Optionally, the photovoltaic power supply system of the present disclosure may further include a first capacitor C1 connected in parallel with the DC bus 100, a second capacitor C2 connected in parallel with the photovoltaic module 200, and a third capacitor C4 connected in parallel with the charging interface, as Figure 2 or Figure 5 shown.
[0094] Based on the above idea, multiple sets of photovoltaic modules, DC voltage conversion devices, and charging interfaces can also be provided in the photovoltaic power supply system. The connection method of each set has been described above and will not be elaborated here. By way of example, the photovoltaic power supply system provided with multiple sets of photovoltaic modules, DC voltage conversion devices, and charging interfaces can be as Figure 7As shown. For another example, a photovoltaic power supply system provided with multiple sets of photovoltaic modules, DC voltage conversion devices, and charging interfaces can be as Figure 8 shown, in Figure 8 , multiple sets of photovoltaic modules, DC voltage conversion devices, and charging interfaces are provided. Among them, the DC voltage conversion device can be respectively connected to the photovoltaic module and the bus, and connected to the charging interface through the second switch module. In addition, the DC voltage conversion device can also be connected to the bus and connected to the charging interface through the second switch module (without connecting to the photovoltaic). At this time, the DC voltage conversion device converts the DC voltage between the bus and the charging interface (equivalent to directly supplying power outward using the bus electrical energy).
[0095] The preferred embodiments of the present disclosure have been described in detail above in conjunction with the accompanying drawings. However, the present disclosure is not limited to the specific details in the above embodiments. Within the scope of the technical concept of the present disclosure, various simple modifications can be made to the technical solutions of the present disclosure, and these simple modifications all belong to the protection scope of the present disclosure.
[0096] In addition, it should be noted that, among the various specific technical features described in the above specific embodiments, they can be combined in any suitable manner without conflict. To avoid unnecessary repetition, the present disclosure will not separately describe various possible combination methods.
[0097] In addition, any combination can be made between various different embodiments of the present disclosure, as long as it does not violate the idea of the present disclosure, and it should also be regarded as the content disclosed by the present disclosure.
Claims
1. A photovoltaic power supply system, characterized in that, Comprising: A DC bus (100), a photovoltaic module (200), a DC voltage conversion device (300), and a charging interface (400); The photovoltaic module (200) is connected to the DC bus (100) and is configured to supply electrical energy to the DC bus (100); The DC voltage conversion device (300) is respectively connected to the DC bus (100) and the charging interface (400), and is configured to output the electrical energy of the DC bus (100) to a vehicle connected to the charging interface (400); The photovoltaic module (200) is further connected to the DC voltage conversion device (300), and is configured to output the electrical energy of the photovoltaic module (200) to a vehicle connected to the charging interface (400).
2. The photovoltaic power supply system according to claim 1, characterized in that, The DC voltage conversion device (300) includes a primary circuit (310), and the primary circuit (310) is respectively connected to the photovoltaic module (200) and the DC bus (100); The photovoltaic power supply system further includes a controller (500), which is connected to the primary circuit (310); The controller (500) is configured to control the primary circuit (310) to receive the electrical energy of the photovoltaic module (200) and control the primary circuit (310) to transmit the electrical energy received from the photovoltaic module (200) to the DC bus (100) when a first condition is satisfied, so that the photovoltaic module (200) supplies electrical energy to the DC bus (100).
3. The photovoltaic power supply system according to claim 2, wherein The primary circuit (310) includes a first inductor (L1), a first bridge arm (B1), a second inductor (L2), and a second bridge arm (B2). A first power switch (Q1) is provided at the upper end of the first bridge arm (B1), a second power switch (Q2) is provided at the lower end of the first bridge arm (B1), a third power switch (Q3) is provided at the upper end of the second bridge arm (B2), and a fourth power switch (Q4) is provided at the lower end of the second bridge arm (B2); A first end of the first inductor (L1) is connected to the positive electrode of the photovoltaic module (200), and a second end of the first inductor (L1) is connected to the midpoint of the first bridge arm (B1); The controller (500) is respectively connected to the control poles of the first power switch (Q1), the second power switch (Q2), the third power switch (Q3), and the fourth power switch (Q4).
4. The photovoltaic power supply system according to claim 3, wherein The controller (500) is configured to periodically send a first control signal to the first power switch (Q1) and the third power switch (Q3) synchronously and periodically send a first complementary control signal complementary to the first control signal to the second power switch (Q2) and the fourth power switch (Q4) when the first condition is satisfied, so as to supply electrical energy to the DC bus (100) by controlling the primary circuit (310) with the photovoltaic module (200).
5. The photovoltaic power supply system according to claim 3, wherein The DC voltage conversion device (300) further includes a transformer (320) and a secondary circuit (330), and the transformer (320) includes a primary winding (321) and a secondary winding (322); The input end of the primary winding (321) of the transformer (320) is connected to the energy output end of the primary circuit (310), the output end of the secondary winding of the transformer (320) is connected to the energy input end of the secondary circuit (330), and the energy output end of the secondary circuit (330) is connected to the charging interface (400); The controller (500) is further configured to control the primary circuit (310) to receive electric energy from the photovoltaic module (200) and / or the bus when a second condition is satisfied, and control the primary circuit (310) and the secondary circuit (330) to enable the secondary circuit (330) to supply electric energy to the charging interface (400); and / or, The controller (500) is further configured to control the primary circuit (310) to receive electric energy from the photovoltaic module (200) when a third condition is satisfied, and control the primary circuit (310) and the secondary circuit (330) to enable the primary circuit (310) to supply electric energy to the bus and enable the secondary circuit (330) to supply electric energy to the charging interface (400).
6. The photovoltaic power supply system according to claim 5, wherein The secondary circuit (330) includes a third inductor (L3), a third bridge arm (B3), and a fourth bridge arm (B4). A fifth power switch (Q5) is disposed at the upper end of the third bridge arm (B3), a sixth power switch (Q6) is disposed at the lower end of the third bridge arm (B3), a seventh power switch (Q7) is disposed at the upper end of the fourth bridge arm (B4), and an eighth power switch (Q8) is disposed at the lower end of the fourth bridge arm (B4); A first end of the third inductor (L3) is connected to a first output end of the secondary winding, and a second end of the third inductor (L3) is connected to the midpoint of the third bridge arm (B3); a second output end of the secondary winding is connected to the midpoint of the fourth bridge arm (B4); the output poles of the fifth power switch (Q5) and the seventh power switch (Q7) are connected to the positive pole of the charging interface (400), and the input poles of the sixth power switch (Q6) and the eighth power switch (Q8) are connected to the negative pole of the charging interface (400); the controller (500) is further connected to the control poles of the fifth power switch (Q5), the sixth power switch (Q6), the seventh power switch (Q7), and the eighth power switch (Q8) respectively.
7. The photovoltaic power supply system according to claim 6, wherein The controller (500) is configured to, when the second condition is satisfied, periodically and synchronously send a second control signal to the first power switch (Q1), the fourth power switch (Q4), the fifth power switch (Q5), and the eighth power switch (Q8), and periodically and synchronously send a second complementary control signal complementary to the second control signal to the second power switch (Q2), the third power switch (Q3), the sixth power switch (Q6), and the seventh power switch (Q7), so as to supply electric energy to the charging interface (400) through the photovoltaic module (200) and / or the DC bus (100).
8. The photovoltaic power supply system according to claim 6, wherein The controller (500) is configured to, when the third condition is satisfied, periodically and synchronously send a third control signal to the first power switch (Q1) and a fourth control signal to the third power switch (Q3), and periodically send a third complementary control signal complementary to the third control signal to the second power switch (Q2) and a fourth complementary control signal complementary to the fourth control signal to the fourth power switch (Q4), and periodically send a fifth control signal to the fifth power switch (Q5) and a sixth control signal to the seventh power switch (Q7), and periodically send a fifth complementary control signal complementary to the fifth control signal to the sixth power switch (Q6) and a sixth complementary control signal complementary to the sixth control signal to the eighth power switch (Q8); Wherein, the third control signal and the fourth control signal have a first phase difference, and the fifth control signal and the sixth control signal have a second phase difference.
9. The photovoltaic power supply system according to claim 6, characterized in that, A target capacitor (C3) is provided between the second output terminal of the secondary winding and the midpoint of the fourth bridge arm (B4); The controller (500) is configured to, when the third condition is satisfied, periodically and synchronously send a seventh control signal to the first power switch (Q1), the fifth power switch (Q5) and the seventh power switch (Q7), and send an eighth control signal to the third power switch (Q3), and periodically send a seventh complementary control signal complementary to the seventh control signal to the second power switch (Q2), the sixth power switch (Q6) and the eighth power switch (Q8), and send an eighth complementary control signal complementary to the eighth control signal to the fourth power switch (Q4); Wherein, the seventh control signal and the eighth control signal have a third phase difference and a preset frequency difference.
10. The photovoltaic power supply system according to any one of claims 1-9, characterized in that, A first switch module (600) is provided between the photovoltaic module (200) and the DC voltage conversion device (300), and the first switch module (600) is configured to conduct or disconnect the circuit between the photovoltaic module (200) and the DC voltage conversion device (300); A second switch module (700) is provided between the DC voltage conversion device (300) and the charging interface (400), and the second switch module (700) is configured to conduct or disconnect the circuit between the DC voltage conversion device (300) and the charging interface (400).