Photovoltaic DC power distribution network multi-voltage power supply dynamic control system and control method thereof

Abstract

The invention provides a photovoltaic DC power distribution network multi-voltage power supply dynamic control system and a control method thereof, and relates to the technical field of photovoltaic power generation. The multi-voltage power supply dynamic control system for the photovoltaic direct-current power distribution network comprises a photovoltaic output module which is configured to convert solar energy into direct current and at least output first voltage and second voltage under the control of a central control module, and the first voltage is larger than the second voltage; the vehicle charging device at least comprises a first charging assembly and a second charging assembly, and the charging power of the first charging assembly is larger than that of the second charging assembly. The first control module is configured to load a first voltage to the first charging assembly or load a second voltage to the second charging assembly under the control of the central control module when the illumination intensity is greater than or equal to a first preset value; and a second control module. And the overall energy efficiency of the photovoltaic direct-current power distribution network can be improved.

Description

Technical Field

[0001] The present disclosure relates to the technical field of photovoltaic power generation, and in particular to a photovoltaic direct current distribution network multi-voltage power supply dynamic control system and a control method thereof. Background Art

[0002] With the rapid development of renewable energy technology, photovoltaic power generation has become an important part of distributed power systems. Photovoltaic systems convert solar energy into electrical energy and are widely used in many fields such as households, industry and commerce.

[0003] However, existing photovoltaic DC distribution networks usually rely on a fixed power allocation mechanism, which results in a waste of some photovoltaic power generation resources and reduces the overall energy efficiency of the system.

[0004] It should be noted that the information disclosed in the above background technology section is only used to enhance the understanding of the background of the present disclosure, and therefore may include information that does not constitute the prior art known to ordinary technicians in the field. Summary of the invention

[0005] The present invention provides a photovoltaic DC power distribution network multi-voltage power supply dynamic control system and a control method thereof, which can improve the overall energy efficiency of the photovoltaic DC power distribution network.

[0006] According to one aspect of the present disclosure, a photovoltaic DC distribution network multi-voltage power supply dynamic control system is provided, comprising: Central control module; a photovoltaic output module, configured to convert solar energy into direct current, and output at least a first voltage and a second voltage under the control of the central control module, wherein the first voltage is greater than the second voltage; A vehicle charging device, used for charging a vehicle, and comprising at least a first charging component and a second charging component, wherein the charging power of the first charging component is greater than the charging power of the second charging component; a first control module, configured to, when the light intensity is greater than or equal to a first preset value, load the first voltage to the first charging component or load the second voltage to the second charging component under the control of the central control module; lighting fixtures; The second control module is configured to, when the light intensity is greater than or equal to the first preset value, reduce the second voltage to a third voltage under the control of the central control module and then load it to the lighting device, and is also configured to, when the light intensity is less than the first preset value, reduce the lighting brightness of the lighting device under the control of the central control module.

[0007] In one embodiment of the present disclosure, the photovoltaic DC distribution network multi-voltage power supply dynamic control system further includes a third control module and a power grid; The third control module is configured to, when the light intensity is greater than or equal to the first preset value and there is a surplus of direct current output by the photovoltaic output module after being distributed by the first charging component and the lighting device, convert the direct current into alternating current under the control of the central control module and transmit it to the power grid.

[0008] In one embodiment of the present disclosure, the third control module is configured to, under the control of the central control module, convert the AC power of the power grid into DC power and transmit it to the second charging component and the lighting device when the light intensity is less than the first preset value and the DC power output by the photovoltaic output module is insufficient to support the operation of the second charging component and the lighting device.

[0009] In one embodiment of the present disclosure, the photovoltaic output module includes a photovoltaic assembly and a first voltage regulating circuit; Wherein, the photovoltaic assembly comprises a plurality of photovoltaic panels connected in series, the photovoltaic panels are used to convert solar energy into direct current, and the light intensity is the light intensity of the photovoltaic panels; The first voltage regulating circuit is configured to regulate the voltage of the direct current output by the photovoltaic panel under the control of the central control module so that the direct current has at least the first voltage and the second voltage.

[0010] In one embodiment of the present disclosure, the photovoltaic output module further includes an energy storage component, which is connected to the photovoltaic component and is used to store the direct current converted by the photovoltaic panel.

[0011] In one embodiment of the present disclosure, the first control module is configured to, when the illumination intensity of the photovoltaic panel is greater than or equal to a first preset value and the power of the energy storage component is greater than or equal to a second preset value, load the first voltage to the first charging component under the control of the central control module; The first control module is also configured to load the second voltage to the second charging component under the control of the central control module when the light intensity of the photovoltaic panel is greater than or equal to a first preset value and the power of the energy storage component is less than a second preset value.

[0012] In one embodiment of the present disclosure, the first control module includes a voltage stabilizing unit and a first switch unit; The voltage stabilizing unit is configured to stabilize the first voltage or the second voltage, and load the stabilized first voltage and the second voltage to the first switch unit; The first switch unit is configured to, when the light intensity of the photovoltaic panel is greater than or equal to the first preset value, load the stabilized first voltage to the first charging component or load the stabilized second voltage to the second charging component under the control of the central control module.

[0013] In one embodiment of the present disclosure, the second control module includes a second voltage regulating circuit, a dimming circuit, and a second switch unit; The second voltage regulating circuit is configured to, when the light intensity is greater than or equal to the first preset value, reduce the second voltage to the third voltage and then load the third voltage to the lighting device; The dimming circuit is configured to reduce the illumination brightness of the lighting device when the illumination intensity is less than the first preset value; The second switch unit is configured to, when the light intensity is greater than or equal to the first preset value, load the second voltage to the second voltage regulating circuit under the control of the central control module; and is also configured to, when the light intensity is less than the first preset value, load the second voltage to the dimming circuit under the control of the central control module.

[0014] In one embodiment of the present disclosure, the first preset value is 1000 W / m 2 .

[0015] According to another aspect of the present disclosure, a control method for a photovoltaic DC distribution network multi-voltage power supply dynamic control system is also provided, which is applied to the photovoltaic DC distribution network multi-voltage power supply dynamic control system described in any of the above embodiments, and the control method includes: Determine whether the light intensity is greater than or equal to a first preset value; if the light intensity is greater than or equal to the first preset value, the first voltage is loaded to the first charging component or the second voltage is loaded to the second charging component, and the second voltage is reduced to a third voltage and then loaded to the lighting device; if the light intensity is less than the first preset value, reduce the lighting brightness of the lighting device.

[0016] When the light intensity is greater than or equal to the first preset value, the photovoltaic DC distribution network has a large output power. The first control module can load the first voltage to the first charging component under the control of the central control module, or the first control module can load the second voltage to the second charging component under the control of the central control module, so that the first charging component or the second charging component can charge the vehicle. At the same time, the second control module can reduce the second voltage to a third voltage under the control of the central control module and then load it to the lighting device, so that the lighting device emits light. When the light intensity is less than the first preset value, due to the small output power of the photovoltaic DC distribution network, the second control module can reduce the lighting brightness of the lighting device under the control of the central control module, so that the lighting device adapts to the situation when the output power of the photovoltaic DC distribution network is small, reducing the load of the photovoltaic DC distribution network, realizing the dynamic power allocation mechanism of the photovoltaic DC distribution network, reducing the waste of photovoltaic power generation resources, and helping to improve the overall energy efficiency of the photovoltaic DC distribution network.

[0017] It is to be understood that the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the present disclosure. BRIEF DESCRIPTION OF THE DRAWINGS

[0018] The accompanying drawings herein are incorporated into the specification and constitute a part of the specification, illustrate embodiments consistent with the present disclosure, and together with the specification are used to explain the principles of the present disclosure. Obviously, the accompanying drawings described below are only some embodiments of the present disclosure, and for ordinary technicians in this field, other accompanying drawings can be obtained based on these accompanying drawings without creative work.

[0019] Figure 1 The signal interaction diagram of a multi-voltage power supply dynamic control system of a photovoltaic DC distribution network in one embodiment of the present disclosure.

[0020] Figure 2 FIG. 4 is an equivalent circuit diagram of a first voltage regulating circuit in one embodiment of the present disclosure.

[0021] Figure 3 0 is a waveform diagram of a first voltage in one embodiment of the present disclosure.

[0022] Figure 4 4 is a waveform diagram of the second voltage in one embodiment of the present disclosure.

[0023] Figure 5 4 is a waveform diagram of a third voltage in one embodiment of the present disclosure.

[0024] Figure 6 FIG. 4 is a waveform diagram of a duty cycle of a PWM dimming circuit in one embodiment of the present disclosure.

[0025] Figure 7 The present invention is a flowchart of a control method for a multi-voltage power supply dynamic control system of a photovoltaic DC distribution network in one embodiment of the present invention.

[0026] Description of reference numerals: 1. Central control module; 2. Photovoltaic output module; 21. Photovoltaic component; 22. First voltage regulating circuit; 221. Boost circuit; 222. Capacitor component; 3. First control module; 31. Voltage stabilizing unit; 32. First switch unit; 4. Second control module; 41. Second voltage regulating circuit; 42. Dimming circuit; 43. Second switch unit; 5. Vehicle charging device; 51. First charging component; 52. Second charging component; 6. Lighting device; 7. Third control module; 8. Power grid. DETAILED DESCRIPTION

[0027] Example embodiments will now be described more fully with reference to the accompanying drawings. However, the example embodiments can be implemented in a variety of forms and should not be construed as limited to the embodiments set forth herein; rather, these embodiments are provided so that the present disclosure will be comprehensive and complete and fully convey the concepts of the example embodiments to those skilled in the art. The same reference numerals in the figures represent the same or similar structures, and thus their detailed description will be omitted. In addition, the drawings are only schematic illustrations of the present disclosure and are not necessarily drawn to scale.

[0028] The terms "a", "an", "the", "said" and "at least one" are used to indicate the presence of one or more elements / components / etc.; the terms "including" and "having" are used to express an open-ended inclusive meaning and mean that additional elements / components / etc. may exist in addition to the listed elements / components / etc.; the terms "first", "second" and "third" etc. are used merely as labels and are not intended to limit the quantity of their objects.

[0029] In related technologies, photovoltaic DC distribution networks usually rely on a fixed power allocation mechanism, which results in a waste of some photovoltaic power generation resources and reduces the overall energy efficiency of the system.

[0030] In order to solve the above problems, the embodiments of the present disclosure provide a photovoltaic DC distribution network multi-voltage power supply dynamic control system. Figure 1The photovoltaic DC power distribution network multi-voltage power supply dynamic control system includes a central control module 1, a photovoltaic output module 2, a first control module 3, a second control module 4, a vehicle charging device 5, and a lighting device 6. The photovoltaic output module 2 is configured to convert solar energy into direct current, and output at least a first voltage and a second voltage under the control of the central control module 1, wherein the first voltage is greater than the second voltage; the vehicle charging device 5 is used to charge the vehicle, and at least includes a first charging component 51 and a second charging component 52, wherein the charging power of the first charging component 51 is greater than the charging power of the second charging component 52; the first control module 3 is configured to load the first voltage to the first charging component 51 or the second voltage to the second charging component 52 under the control of the central control module 1 when the light intensity is greater than or equal to the first preset value; the lighting device 6 is used for emitting light; the second control module 4 is configured to reduce the second voltage to a third voltage and then load it to the lighting device 6 under the control of the central control module 1 when the light intensity is greater than or equal to the first preset value, and is also configured to reduce the lighting brightness of the lighting device 6 under the control of the central control module 1 when the light intensity is less than the first preset value.

[0031] In this way, when the light intensity is greater than or equal to the first preset value, the photovoltaic DC distribution network has a large output power. The first control module 3 can load the first voltage to the first charging component 51 under the control of the central control module 1, or the first control module 3 can load the second voltage to the second charging component 52 under the control of the central control module 1, so that the first charging component 51 or the second charging component 52 can charge the vehicle. At the same time, the second control module 4 can reduce the second voltage to a third voltage under the control of the central control module 1 and then load it to the lighting device 6, so that the lighting device 6 emits light. When the light intensity is less than the first preset value, due to the small output power of the photovoltaic DC distribution network, the second control module 4 can reduce the lighting brightness of the lighting device 6 under the control of the central control module 1, so that the lighting device 6 adapts to the situation when the output power of the photovoltaic DC distribution network is small, reducing the load of the photovoltaic DC distribution network, realizing the dynamic power allocation mechanism of the photovoltaic DC distribution network, reducing the waste of photovoltaic power generation resources, and being conducive to improving the overall energy efficiency of the photovoltaic DC distribution network.

[0032] It should be noted that the photovoltaic DC distribution network may include a photovoltaic output module 2 , and the output power of the photovoltaic DC distribution network may be the output power of the photovoltaic output module 2 .

[0033] In one embodiment of the present disclosure, the first preset value may be 800 W / m 2 ~1000W / m 2 For example, the first preset value may be 800W / m 2 、820W / m 2、840W / m 2 、860W / m 2 、880W / m 2 , 900 W / m 2 、920W / m 2 , 940 W / m 2 、960W / m 2 、980W / m 2 Or 1000W / m 2 .

[0034] In one embodiment of the present disclosure, the first control module 3 is also configured to, when the light intensity is greater than or equal to a first preset value, load a first voltage to the first charging component 51 and load a second voltage to the second charging component 52 under the control of the central control module 1, so as to simultaneously power the first charging component 51 and the second charging component 52.

[0035] In one embodiment of the present disclosure, the first control module 3 is further configured to, under the control of the central control module 1, not load the first voltage to the first charging component 51 and not load the second voltage to the second charging component 52 when the light intensity is less than the first preset value. In some other embodiments of the present disclosure, the first control module 3 is further configured to, under the control of the central control module 1, only load the second voltage to the second charging component 52 when the light intensity is less than the first preset value. In this way, the power-on of the first charging component 51 and the second charging component 52 can be controlled according to the different output powers of the photovoltaic DC distribution network, which is conducive to realizing the dynamic power allocation mechanism of the photovoltaic DC distribution network and reducing the waste of photovoltaic power generation resources.

[0036] In one embodiment of the present disclosure, both the first charging component 51 and the second charging component 52 may include a charging pile, which may be a car charging pile or an electric bicycle charging pile, so that the vehicle can be charged by connecting the charger to the charging pile. The voltages required by the two charging piles are different. For example, the value of the first voltage may be 750V, the charging power of the first charging component 51 may be 11kW, the value of the second voltage may be 375V, and the charging power of the second charging component 52 may be 3.3kW, so as to provide the first charging component 51 and the second charging component 52 with their respective required voltages, so that the charging power of the first charging component 51 is higher than the charging power of the second charging component 52. The first charging component 51 and the second charging component 52 have a constant current and constant voltage charging function to improve the safety during the charging process.

[0037] In one embodiment of the present disclosure, the lighting device 6 may be an LED lamp, an incandescent lamp, a fluorescent lamp, a neon lamp, or the like. The voltage required by the lighting device 6 is 12V, 24V, or 48V, and the power required is 2kW.

[0038] In one embodiment of the present disclosure, see Figure 1 , the photovoltaic DC distribution network multi-voltage power supply dynamic control system also includes a third control module 7 and a power grid 8. The third control module 7 is configured to, when the light intensity is greater than or equal to the first preset value and the DC power output by the photovoltaic output module 2 is surplus after being distributed by the first charging component 51 and the lighting device 6, convert the DC power into AC power under the control of the central control module 1 and transmit it to the power grid 8. In this way, when the output power of the photovoltaic output module 2 is sufficient, the DC power generated by the photovoltaic output module 2 can be distributed by the third control module 7 through the vehicle charging device 5 and the lighting device 6, and the remaining DC power can be converted into AC power through the third control module 7 and transmitted to the power grid 8, so that the third control module 7 is deeply coordinated with the vehicle charging device 5 and the lighting device 6, which improves and reduces the waste of electric energy and the fluctuation of current, and improves the coordination of grid connection and the stability of the power grid 8.

[0039] In one embodiment of the present disclosure, the third control module 7 is configured to, under the control of the central control module 1, convert the AC power of the power grid 8 into DC power and transmit it to the second charging component 52 and the lighting device 6 when the light intensity is less than the first preset value and the DC power output by the photovoltaic output module 2 is insufficient to support the operation of the second charging component 52 and the lighting device 6. In this way, through the reverse operation of the third control module 7, the power grid 8 can supply power to the vehicle charging device 5 and the lighting device 6, thereby improving the stability and reliability of the photovoltaic DC distribution network and the photovoltaic DC distribution network multi-voltage power supply dynamic control system.

[0040] In one embodiment of the present disclosure, the third control module 7 may include an inverter, and the type of the inverter may be a full-bridge inverter, an H-bridge inverter, an H6-bridge inverter, or a T-type three-level inverter. The third control module 7 may have a voltage and current dual-loop control function, which is conducive to the output stability of the third control module 7, and the total harmonic current distortion rate (Total Harmonic Current Distortion, THDi) of the grid-connected current is less than 3%, so as to facilitate safe and stable grid connection to the grid 8.

[0041] In one embodiment of the present disclosure, see Figure 1, the photovoltaic output module 2 includes a photovoltaic assembly 21 and a first voltage regulating circuit 22. The photovoltaic assembly 21 includes a plurality of photovoltaic panels connected in series, and the photovoltaic panels can be monocrystalline silicon or polycrystalline silicon solar panels, so that the photovoltaic panels are used to convert solar energy into direct current, improve conversion efficiency and service life, and the light intensity is the light intensity of the photovoltaic panel; when the light intensity is greater than the first preset value, the conversion efficiency of the photovoltaic assembly 21 can be 20%~22%, so that the photovoltaic assembly 21 has a higher conversion efficiency and improves power generation efficiency. The output voltage of the photovoltaic assembly 21 can be 200V~500V.

[0042] The first voltage regulating circuit 22 is configured to regulate the voltage of the direct current output by the photovoltaic panel under the control of the central control module 1 so that the direct current has at least a first voltage and a second voltage. Figure 2 , the first voltage regulating circuit 22 may include a boost circuit 221 and a capacitor component 222. The boost circuit 221 has an input end and an output end, the input end is electrically connected to the photovoltaic component 21, and the output end is connected to the capacitor component 222. The capacitor component 222 includes two capacitors connected in series to output a high level, a zero level, and a low level. In an example, the high level may be 375V, the zero level may be 0V, and the low level may be -375V. The first charging component 51 may be connected to the high level terminal and the low level terminal to load a first voltage of 750V to the first charging component 51; the second charging component 52 and the lighting device 6 may be connected to the high level terminal and the zero level terminal, or the second charging component 52 and the lighting device 6 may be connected to the zero level terminal and the low level terminal to load a second voltage of 375V to the second charging component 52, and the second control module 4 reduces the second voltage of 375V to a third voltage and then loads it to the lighting device 6. In this way, different voltages can be output through a first voltage regulating circuit 22 to adapt to different loads (such as the first charging component 51, the second charging component 52, and the lighting device 6), thereby reducing the number of boost circuits 221, simplifying the system design, and reducing the hardware cost.

[0043] It should be noted that a high-level terminal refers to a terminal capable of outputting a high level, a zero-level terminal refers to a terminal capable of outputting a zero level, and a low-level terminal refers to a terminal capable of outputting a low level.

[0044] In an embodiment of the present disclosure, the first capacitor and the second capacitor may be a thin film capacitor, an electrolytic capacitor, or a capacitor combining a thin film capacitor and an electrolytic capacitor, and no limitation is made herein, as long as voltage division can be achieved.

[0045] In one embodiment of the present disclosure, see Figure 3 , Figure 3It shows the voltage (first voltage) between the high-level terminal and the low-level terminal after using the capacitor component. The first voltage fluctuates up and down within 0~0.07s, tends to be stable after 0.07s, and stabilizes to 750V, which is safe and reliable.

[0046] In one embodiment of the present disclosure, see Figure 4 , Figure 4 It shows the voltage (second voltage) between the high level terminal and the zero level terminal after using the capacitor component. The second voltage fluctuates up and down within 0~0.07s, tends to be stable after 0.07s, and stabilizes to 375V.

[0047] In one embodiment of the present disclosure, the photovoltaic DC distribution network multi-voltage power supply dynamic control system may also include a maximum power point tracking module, which is connected to the photovoltaic component 21, and the maximum power point tracking module adjusts the operating voltage and operating current of the photovoltaic component 21 in real time by adopting a perturbation observation method or an incremental conductance method, so that the photovoltaic component 21 is at the maximum power point and outputs maximum power, which is beneficial to improving energy utilization.

[0048] In one embodiment of the present disclosure, the photovoltaic output module 2 further includes an energy storage component, which is connected to the photovoltaic component 21 and is used to store the direct current converted by the photovoltaic panel. In one example, the energy storage component can be a plurality of batteries connected in series or in parallel, so that the direct current converted by the photovoltaic panel is stored in the battery for subsequent use.

[0049] In one embodiment of the present disclosure, the first control module 3 is configured to load the first voltage to the first charging component 51 under the control of the central control module 1 when the illumination intensity of the photovoltaic panel is greater than or equal to the first preset value and the power of the energy storage component is greater than or equal to the second preset value. The first control module 3 is also configured to load the second voltage to the second charging component 52 under the control of the central control module 1 when the illumination intensity of the photovoltaic panel is greater than or equal to the first preset value and the power of the energy storage component is less than the second preset value. Among them, the second preset value can be 80%. In this way, according to the output condition of the photovoltaic panel, the power-on status of the first charging component 51 and the second charging component 52 can be switched and controlled by the first control module 3, which is conducive to the dynamic allocation of the output power of the photovoltaic DC distribution network, avoiding the situation where the first charging component 51 is still working when the output power of the photovoltaic DC distribution network is insufficient, reducing the load of the photovoltaic DC distribution network, and improving the stability of the photovoltaic DC distribution network.

[0050] In one embodiment of the present disclosure, see Figure 1, the first control module 3 includes a voltage stabilizing unit 31 and a first switch unit 32. The voltage stabilizing unit 31 is configured to stabilize the first voltage and the second voltage, and load the stabilized first voltage and the second voltage to the first switch unit 32; the first switch unit 32 is configured to load the stabilized first voltage to the first charging component 51 or the stabilized second voltage to the second charging component 52 under the control of the central control module 1 when the light intensity of the photovoltaic panel is greater than or equal to the first preset value. In an example, the voltage stabilizing unit 31 may include a CLLC resonant converter and be isolated by a high-frequency transformer. The first switch unit 32 may include a power switch matrix, and the first switch unit 32 is connected to the first charging component 51 and the second charging component 52 respectively to realize the control of the first charging component 51 or the second charging component 52 to power on, so as to adapt to the dynamic distribution of the output power of the photovoltaic DC distribution network.

[0051] In one embodiment of the present disclosure, see Figure 1, the second control module 4 includes a second voltage regulating circuit 41, a dimming circuit 42, and a second switch unit 43. The second voltage regulating circuit 41 is configured to, when the light intensity is greater than or equal to the first preset value, reduce the second voltage to a third voltage and load the third voltage to the lighting device 6; the dimming circuit 42 is configured to, when the light intensity is less than the first preset value, reduce the lighting brightness of the lighting device 6; the second switch unit 43 is configured to, when the light intensity is greater than or equal to the first preset value, load the second voltage to the second voltage regulating circuit 41 under the control of the central control module 1; and is also configured to, when the light intensity is less than the first preset value, load the second voltage to the dimming circuit 42 under the control of the central control module 1. In one example, the first voltage may be 750V, the second voltage may be 375V, and the third voltage may be 48V. The second voltage regulating circuit 41 may be an LLC resonant converter. The input voltage of the second voltage regulating circuit 41 is 375V, the output voltage is 48V, and the output efficiency is greater than 96%, so as to facilitate high-power stable output when the output power of the photovoltaic DC distribution network is sufficient. The dimming circuit 42 may be a buck circuit. The input voltage of the dimming circuit 42 may be 375V, the output voltage may be 12V-24V, and the dimming circuit 42 has a pulse width modulation (PWM) dimming interface with a dimming frequency of 1kHz. Thus, when the light intensity is greater than or equal to the first preset value, the second switch unit 43 can load the second voltage to the second voltage regulating circuit 41, and the second voltage regulating circuit 41 reduces the second voltage to the third voltage and loads the third voltage to the lighting device 6 to achieve normal operation of the lighting device 6; when the light intensity is less than the first preset value, the second switch unit 43 loads the second voltage to the dimming circuit 42 under the control of the central control module 1, and the dimming circuit 42 adjusts the duty cycle of PWM (for example, see Figure 6 , the duty cycle of PWM is reduced from 100% to 50%), so that the brightness of the lighting device 6 is automatically reduced, reducing the load of the photovoltaic DC distribution network, which is beneficial to improving the stability of the photovoltaic DC distribution network.

[0052] In one embodiment of the present disclosure, see Figure 5 , Figure 5 The waveform diagram of the third voltage is shown. The third voltage rises within 0-0.03s, stabilizes after 0.03s, and stabilizes to 48V.

[0053] In one embodiment of the present disclosure, when the light intensity is greater than or equal to the first preset value and the amount of electricity in the energy storage component is greater than or equal to the second preset value, the central controller is configured to send a first switching signal to the first switch unit 32 and a second switching signal to the second switch unit 43, the first switch unit 32 is configured to receive the first switching signal so that the first voltage is loaded to the first charging component 51, and the second switch unit 43 is configured to receive the second switching signal so that the second voltage is loaded to the second voltage regulating circuit 41; wherein, when the output power of the photovoltaic output module 2 is surplus, the central controller is further configured to send a grid connection signal to the third control module 7, and the third control module 7 receives the grid connection signal so that the photovoltaic DC distribution network supplies power to the grid 8. When the light intensity is greater than or equal to the first preset value and the amount of electricity in the energy storage component is less than the second preset value, the central controller is configured to send a third switching signal to the first switch unit 32, and the first switch unit 32 is configured to receive the third switching signal so that the second voltage is loaded to the second charging component 52. When the light intensity is less than a first preset value, the central controller is configured not to send a switching signal to the first switch unit 32 so that the vehicle charging device 5 does not work, and the central controller is also configured to send a fourth switching signal to the second switch unit 43, and to send a supplementary power signal to the third control module 7. The second switch unit 43 is configured to receive the fourth switching signal so that the second voltage is loaded to the dimming circuit 42, and the third control module 7 receives the supplementary power signal so that the power grid 8 supplies power to the photovoltaic DC distribution network.

[0054] The present disclosure also provides a control method for a photovoltaic DC distribution network multi-voltage power supply dynamic control system, which is applied to the photovoltaic DC distribution network multi-voltage power supply dynamic control system described in any of the above embodiments. The control method has all the beneficial effects of the photovoltaic DC distribution network multi-voltage power supply dynamic control system described above, which will not be described in detail here. Figure 7 The control method of the photovoltaic DC distribution network multi-voltage power supply dynamic control system includes: Step S100, determine whether the light intensity is greater than or equal to the first preset value; if the light intensity is greater than or equal to the first preset value, control the first voltage to be loaded to the first charging component 51 or the second voltage to be loaded to the second charging component 52, and the second voltage is reduced to the third voltage and then loaded to the lighting device 6; if the light intensity is less than the first preset value, reduce the lighting brightness of the lighting device 6.

[0055] In one embodiment of the present disclosure, in step S100, if the light intensity is less than the first preset value, the second voltage is loaded to the dimming circuit 42, the dimming circuit 42 reduces the lighting brightness of the lighting device 6, and the power grid 8 supplies power to the photovoltaic DC distribution network through the third control module 7 until the light intensity is greater than or equal to the first preset value.

[0056] In one embodiment of the present disclosure, see Figure 7 , the control method of the photovoltaic DC distribution network multi-voltage power supply dynamic control system also includes: Step S200, determine whether the power of the energy storage component is greater than or equal to the second preset value; if the power of the energy storage component is greater than or equal to the second preset value, the first switch unit 32 loads the first voltage to the first charging component 51, and the second charging component 52 does not work; if the power of the energy storage component is less than the second preset value, the first switch unit 32 loads the second voltage to the second charging component 52, and the first charging component 51 does not work.

[0057] Step S300, determine whether the output power of the photovoltaic component 21 is surplus; if the output power of the photovoltaic component 21 is surplus, the third control module 7 runs forward, converts the direct current of the photovoltaic component 21 into alternating current and inputs it into the power grid 8; if the output power of the photovoltaic component 21 is not surplus, the output power of the photovoltaic component 21 is continuously determined.

[0058] In one embodiment of the present disclosure, see Figure 7 In step S200, if the power of the energy storage component is less than the second preset value, the second switch unit 43 loads the second voltage to the second voltage regulating circuit 41, and the second voltage regulating circuit 41 reduces the second voltage to a third voltage to power the lighting device 6.

[0059] In one embodiment of the present disclosure, see Figure 7 In step S300, if the output power of the photovoltaic assembly 21 is surplus, the central control module 1 calculates the grid-connected power threshold and controls the third control module 7 to perform the grid-connected operation.

[0060] It should be noted that, although the steps of the control method of the photovoltaic DC distribution network multi-voltage power supply dynamic control system in the present disclosure are described in a specific order in the accompanying drawings, this does not require or imply that these steps must be performed in this specific order, or that all the steps shown must be performed to achieve the desired results. Additionally or alternatively, some steps may be omitted, multiple steps may be combined into one step, and / or one step may be decomposed into multiple steps, etc.

[0061] Those skilled in the art will readily appreciate other embodiments of the present disclosure after considering the specification and practicing the invention disclosed herein. This application is intended to cover any modification, use or adaptation of the present disclosure, which follows the general principles of the present disclosure and includes common knowledge or customary techniques in the art that are not disclosed in the present disclosure. The specification and examples are intended to be exemplary only, and the true scope and spirit of the present disclosure are indicated by the appended claims.

Claims

1. A photovoltaic DC distribution network multi-voltage power supply dynamic control system, characterized in that: include: Central control module; a photovoltaic output module, configured to convert solar energy into direct current, and output at least a first voltage and a second voltage under the control of the central control module, wherein the first voltage is greater than the second voltage; A vehicle charging device, used for charging a vehicle, and comprising at least a first charging component and a second charging component, wherein the charging power of the first charging component is greater than the charging power of the second charging component; a first control module, configured to, when the light intensity is greater than or equal to a first preset value, load the first voltage to the first charging component or load the second voltage to the second charging component under the control of the central control module; lighting fixtures; The second control module is configured to, when the light intensity is greater than or equal to the first preset value, reduce the second voltage to a third voltage under the control of the central control module and then load it to the lighting device, and is also configured to, when the light intensity is less than the first preset value, reduce the lighting brightness of the lighting device under the control of the central control module.

2. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 1 is characterized in that: The photovoltaic DC distribution network multi-voltage power supply dynamic control system also includes a third control module and a power grid; The third control module is configured to, when the light intensity is greater than or equal to the first preset value and there is a surplus of direct current output by the photovoltaic output module after being distributed by the first charging component and the lighting device, convert the direct current into alternating current under the control of the central control module and transmit it to the power grid.

3. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 2 is characterized in that: The third control module is configured to, when the light intensity is less than the first preset value and the DC power output by the photovoltaic output module is insufficient to support the operation of the second charging component and the lighting device, convert the AC power of the power grid into DC power under the control of the central control module and transmit it to the second charging component and the lighting device.

4. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 1, characterized in that: The photovoltaic output module includes a photovoltaic component and a first voltage regulating circuit; Wherein, the photovoltaic assembly comprises a plurality of photovoltaic panels connected in series, the photovoltaic panels are used to convert solar energy into direct current, and the light intensity is the light intensity of the photovoltaic panels; The first voltage regulating circuit is configured to regulate the voltage of the direct current output by the photovoltaic panel under the control of the central control module so that the direct current has at least the first voltage and the second voltage.

5. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 4 is characterized in that: The photovoltaic output module also includes an energy storage component, which is connected to the photovoltaic component and is used to store the direct current converted by the photovoltaic panel.

6. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 5, characterized in that: The first control module is configured to, when the illumination intensity of the photovoltaic panel is greater than or equal to a first preset value and the power of the energy storage component is greater than or equal to a second preset value, load the first voltage to the first charging component under the control of the central control module; The first control module is also configured to load the second voltage to the second charging component under the control of the central control module when the light intensity of the photovoltaic panel is greater than or equal to a first preset value and the power of the energy storage component is less than a second preset value.

7. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 6, characterized in that: The first control module includes a voltage stabilizing unit and a first switch unit; The voltage stabilizing unit is configured to stabilize the first voltage or the second voltage, and load the stabilized first voltage and the second voltage to the first switch unit; The first switch unit is configured to, when the light intensity of the photovoltaic panel is greater than or equal to the first preset value, load the stabilized first voltage to the first charging component or load the stabilized second voltage to the second charging component under the control of the central control module.

8. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to claim 1, characterized in that: The second control module includes a second voltage regulating circuit, a dimming circuit, and a second switch unit; The second voltage regulating circuit is configured to, when the light intensity is greater than or equal to the first preset value, reduce the second voltage to the third voltage and then load the third voltage to the lighting device; The dimming circuit is configured to reduce the illumination brightness of the lighting device when the illumination intensity is less than the first preset value; The second switch unit is configured to, when the light intensity is greater than or equal to the first preset value, load the second voltage to the second voltage regulating circuit under the control of the central control module; and is also configured to, when the light intensity is less than the first preset value, load the second voltage to the dimming circuit under the control of the central control module.

9. The photovoltaic DC distribution network multi-voltage power supply dynamic control system according to any one of claims 1 to 8, characterized in that: The first preset value is 1000W / m 2 .

10. A control method for a multi-voltage power supply dynamic control system of a photovoltaic DC distribution network, characterized in that: Applied to the photovoltaic DC distribution network multi-voltage power supply dynamic control system according to any one of claims 1 to 9, the control method comprises: Determine whether the light intensity is greater than or equal to a first preset value; if the light intensity is greater than or equal to the first preset value, the first voltage is loaded to the first charging component or the second voltage is loaded to the second charging component, and the second voltage is reduced to a third voltage and then loaded to the lighting device; if the light intensity is less than the first preset value, reduce the lighting brightness of the lighting device.

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