Control apparatus and control method for all-weather photovoltaic power generation system

Abstract

The present invention relates to the technical field of photovoltaic power generation, and in particular to a control apparatus and control method for an all-weather photovoltaic power generation system. The control apparatus comprises a first acquisition unit, a second acquisition unit, a first switch, a second switch, and a micro-control unit. According to the present invention, the control apparatus capable of controlling the mode of generation of power by a photovoltaic module for a control module is provided in the photovoltaic power generation system, so that the control module can always keep working in a full-load state, thereby greatly improving the photoelectric conversion efficiency of the photovoltaic module.

Description

Control device and control method of all-weather photovoltaic power generation system TECHNICAL FIELD

[0001] The present application relates to the field of photovoltaic power generation technology, and in particular to a control device and control method of an all-weather photovoltaic power generation system. BACKGROUND

[0002] With the increasingly prominent energy crisis, clean and renewable energy generation technologies such as photovoltaic power generation are being applied more and more widely. Due to the natural complementarity of light resources, photovoltaic complementary power generation has great development prospects. In a photovoltaic power supply system, each power generation unit can be independently controlled or work in coordination, and the power supply safety and reliability are relatively high, which can provide uninterrupted power for communication facilities and residential life in remote areas such as deserts and plateaus.

[0003] Photovoltaic power generation is affected by the intensity of sunlight. Since the sunlight in nature is unpredictable, the power output of the photovoltaic power generation system is unstable, and a certain capacity of energy storage device is usually required to compensate for the power to maintain the stability of the output. In addition, when extreme bad weather, night, and other conditions occur, the system may stop supplying power to the user, and the waste of light energy will occur. If there is no backup energy support, some important and sensitive equipment will not work normally.

[0004] Although the energy storage device is configured, the timing of energy storage and energy release of the energy storage device cannot be accurately controlled. SUMMARY

[0005] Other features and advantages of the present application will be set forth in the following specification, and in part will become apparent to those skilled in the art upon examination of the specification or can be learned by practice of the application. The objects and other advantages of the present application can be realized and attained by the structure particularly pointed out in the specification as well as the appended drawings.

[0006] The present application aims to overcome the above-mentioned deficiencies, and provides a control device and control method of an all-weather photovoltaic power generation system. The control device for controlling the power generation mode of the photovoltaic assembly to the control assembly is arranged in the photovoltaic power generation system, which can realize that the control assembly always works in a full load state, and greatly improves the photoelectric conversion efficiency of the photovoltaic assembly.

[0007] The present application provides a control device of an all-weather photovoltaic power generation system, which comprises

[0008] a first acquisition unit for acquiring an output signal value of a photovoltaic assembly;

[0009] a second acquisition unit for acquiring an output signal value and a change trend of a super capacitor module;

[0010] a first switch for controlling whether the photovoltaic module is connected with the supercapacitor module;

[0011] a second switch for controlling whether the supercapacitor module is connected with the control module;

[0012] a micro control unit for storing, processing, analyzing the output signal value of the photovoltaic module and the output signal value of the supercapacitor module and their changing trends, to control the opening and closing of the first switch and the second switch.

[0013] In some embodiments, the output signal value of the photovoltaic module is the output voltage, output current or output power of the photovoltaic module.

[0014] In some embodiments, the output signal value of the supercapacitor module is the output voltage, output current or output power of the supercapacitor module.

[0015] In some embodiments, the supercapacitor module comprises a plurality of supercapacitors, each of which is connected in series or / and in parallel with each other.

[0016] In some embodiments, when the output signal value of the photovoltaic module is greater than or equal to the first threshold value of the input signal of the control module, the micro control unit controls the first switch to be opened, so that the photovoltaic module is connected with the control module.

[0017] In some embodiments, when the output signal value of the photovoltaic module is less than the first threshold value of the input signal of the control module, the micro control unit controls the first switch to be closed, so that the photovoltaic module is connected with the supercapacitor module.

[0018] In some embodiments, when the output signal value of the supercapacitor module shows an upward trend and rises to the second threshold value of the input signal of the control module, the micro control unit controls the second switch to be closed, so that the supercapacitor module is connected with the control module.

[0019] In some embodiments, when the output signal value of the supercapacitor module shows a downward trend and is greater than the first threshold value of the input signal of the control module, the micro control unit controls the second switch to be continuously closed, so that the supercapacitor module is continuously connected with the control module.

[0020] In some embodiments, when the output signal value of the supercapacitor module shows a downward trend and falls to the first threshold value of the input signal of the control module, the micro control unit controls the second switch to be continuously opened, so that the supercapacitor module is disconnected from the control module.

[0021] In some embodiments, the control module is an inverter.

[0022] The application further provides a control method of the all-weather photovoltaic power generation system, which is executed by the control device.

[0023] Collecting an output signal value of the photovoltaic module;

[0024] Comparing the output signal value of the photovoltaic module with the first threshold value of the input signal of the control module;

[0025] Controlling the closing and opening of the first switch.

[0026] In some embodiments, if the output signal value of the photovoltaic module is greater than or equal to the first threshold value of the input signal of the control module, the first switch is opened, so that the photovoltaic module is connected with the control module and the photovoltaic module directly generates power for the control module.

[0027] In some embodiments, if the output signal value of the photovoltaic module is less than the first threshold value of the input signal of the control module, the first switch is closed, so that the photovoltaic module is connected with the super capacitor module and the photovoltaic module generates power for the control module through the super capacitor module.

[0028] In some embodiments, the photovoltaic module generates power for the control module through the super capacitor module, specifically

[0029] Collecting an output signal value of the super capacitor module and a change trend thereof;

[0030] Comparing the output signal value of the super capacitor module with the first threshold value and the second threshold value of the input signal of the control module, and judging the change state of the output signal value of the super capacitor module;

[0031] Controlling the closing and opening of the second switch.

[0032] In some embodiments, if the output signal value of the super capacitor module shows an upward trend and rises to the second threshold value of the input signal of the control module, the second switch is closed, so that the super capacitor module is connected with the control module;

[0033] If the output signal value of the super capacitor module shows a downward trend and is greater than the first threshold value of the input signal of the control module, the second switch is continuously closed, so that the super capacitor module is continuously connected with the control module;

[0034] If the output signal value of the super capacitor module shows a downward trend and falls to the first threshold value of the input signal of the control module, the second switch is opened, so that the super capacitor module is disconnected with the control module.

[0035] By adopting the technical solutions described above, the application has the following beneficial effects:

[0036] The application can keep the control assembly working in full load state all the time, and greatly improves the photoelectric conversion efficiency of the photovoltaic assembly.

[0037] The application sets the second switch capable of controlling the charging and discharging of the super capacitor module in the control device, and further realizes that the light source can be collected and converted into electric energy for the control assembly in weak light environment such as night, cloudy day, rainy day, etc., which not only improves the utilization rate of the light source, but also greatly improves the photoelectric conversion rate.

[0038] It should be understood that the above general description and the following detailed description are only exemplary and explanatory, and cannot limit the present disclosure.

[0039] It is obvious that such purposes and other purposes of the application will become more apparent after the description of the preferred embodiments described in the following various drawings and diagrams.

[0040] In order to make the above and other purposes, features and advantages of the application more obvious and easy to understand, one or more preferred embodiments are described in detail below, and the drawings are shown, and are described as follows. BRIEF DESCRIPTION OF DRAWINGS

[0041] The drawings are used to provide a further understanding of the application, and constitute a part of the specification, and are used to explain the application together with the embodiments of the application, and do not constitute a limitation on the application.

[0042] In the drawings, the same parts use the same reference numerals, and the drawings are schematic and are not necessarily drawn according to the actual scale.

[0043] In order to more clearly illustrate the technical solutions in the embodiments of the application or the prior art, the drawings needed to be used in the embodiments or the prior art description will be briefly introduced as follows. Obviously, the drawings in the following description can only be one or more embodiments of the application, and those skilled in the art can obtain other drawings according to such drawings without creative labor.

[0044] Fig. 1 is a control device structure diagram of the all-weather photovoltaic power generation system according to some embodiments of the application;

[0045] Fig. 2 is a control method flow diagram of the all-weather photovoltaic power generation system according to some embodiments of the application;

[0046] Fig. 3 is a super capacitor module charging and discharging method flow diagram according to some embodiments of the application. DETAILED DESCRIPTION

[0047] In order to make the objects, technical solutions and advantages of the present application clearer, the present application will be further described in detail below with reference to the specific embodiments. It should be understood that the specific embodiments described herein are merely intended to explain the present application, but not to limit the present application.

[0048] In addition, in the description of the present application, it should be understood that the terms "center", "upper", "lower", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "axial", "radial", "circumferential" and the like indicate the orientation or positional relationship shown in the drawings based on the orientation or positional relationship shown in the drawings, and are merely for the convenience of describing the present application and simplifying the description, and therefore cannot be understood as indicating or implying that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application.

[0049] In the present application, unless otherwise explicitly specified and limited, the terms "mounting", "connection", "connecting", "fixing" and the like should be understood broadly, for example, can be fixed connection, can also be detachable connection, or can be integrated; can be directly connected, or can be indirectly connected through an intermediate medium; can be the internal communication of two elements or the interaction relationship between two elements. However, it is noted that direct connection means that the connection between the two main bodies does not form a connection relationship through a transition structure, but is connected only through a connection structure to form a whole. For those skilled in the art, the specific meaning of the above terms in the present application can be understood according to the specific circumstances.

[0050] In the present application, unless otherwise explicitly specified and limited, the first feature "on" or "under" the second feature can be that the first and second features are in direct contact, or the first and second features are in indirect contact through an intermediate medium. In the description of the present specification, the description referring to the terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the illustrative description of the above terms does not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. SUMMARY

[0051] With the increasing prominence of energy crisis, clean and renewable energy generation technologies such as photovoltaic power generation are being applied more and more widely. Due to the natural complementarity of light resources, photovoltaic power generation has great development prospects. In a photovoltaic power supply system, each power generation unit can be independently controlled or coordinated to work, and the power supply safety and reliability is relatively high, which can provide uninterrupted power for communication facilities and residential life in remote areas such as deserts and plateaus.

[0052] Photovoltaic power generation system as a clean energy is more and more valued. Grid-connected photovoltaic power generation system is a photovoltaic power generation system which has a power connection with the local power grid. At present, large-scale grid-connected photovoltaic power generation systems are installed on the roofs of cities. Due to the natural volatility of the power generation of the grid-connected photovoltaic power generation system caused by the influence of environmental factors such as weather, temperature, and illumination, in other words, the output power of the photovoltaic power generation system often has randomness and intermittency. Therefore, the output power of the photovoltaic power generation system cannot completely meet the input power of the electrical equipment, especially in weak light environments such as night, cloudy day, rainy day, etc., its output function cannot meet the minimum requirement of the input power of the electrical equipment, thereby leading to the failure of the normal operation of the electrical equipment, etc., and also leading to the great waste of light sources.

[0053] Therefore, in the photovoltaic power generation system, an electric energy storage pool needs to be equipped to collect light sources in weak light environments such as night, cloudy day, and rainy day, and convert them into electric energy to improve the photoelectric conversion rate. That is, equipping an electric energy storage pool is a technical problem to be solved.

[0054] The super capacitor is a new type of energy storage device that combines the advantages of traditional capacitors and batteries, which stores energy through the interface double-layer between the electrode and the electrolyte. It has the characteristics of both fast charging and discharging of capacitors and energy storage characteristics of batteries. And the super capacitor has the following characteristics:

[0055] Long cycle life: its use frequency can be up to 1 million times;

[0056] Instantaneous large current: its instantaneous current can be up to 4600A;

[0057] High safety: it will not naturally explode;

[0058] No voltage platform: it can also be charged under weak current conditions.

[0059] Therefore, the super capacitor is often used as an electric energy storage pool, and its application field is also becoming more and more extensive.

[0060] Further, the super capacitor can also be applied to the photovoltaic power generation system as an electric energy storage pool, but how to combine the super capacitor with the photovoltaic power generation system to realize the collection and photoelectric conversion of weak light is a technical problem to be solved.

[0061] In view of the above technical problems, the basic idea of the present application is to provide a kind of all-weather photovoltaic power generation system.The present application adds super capacitor module between photovoltaic module and control module, super capacitor module utilizes the characteristics of long cycle life, no voltage platform, instantaneous large current of super capacitor, realizes in weak light environment such as night, cloudy day, rainy day, can also collect light source and convert into electric energy, output electric energy for control module, not only improve the utilization of light source, also greatly improve the photoelectric conversion rate.In addition, the present application also provides a kind of control device of all-weather photovoltaic power generation system, which can control the power generation mode of photovoltaic module to control module, realize that control module always keeps in full load state and works, greatly improve the photoelectric conversion efficiency of photovoltaic module.

[0062] Exemplary control device

[0063] Figure 1 is a control device structure diagram of the all-weather photovoltaic power generation system of some embodiments of the present application.As shown in Figure 1, the exemplary control device includes a first acquisition unit, a second acquisition unit, a first switch, a second switch and a micro control unit.The first acquisition unit is used to acquire the output signal value of the photovoltaic module;The second acquisition unit is used to acquire the output signal value and its change trend of the super capacitor module;The first switch is used to control whether the photovoltaic module is connected with the super capacitor module;The second switch is used to control whether the super capacitor module is connected with the control module;The micro control unit is used to store, process and analyze the output signal value of the photovoltaic module and the output signal value and its change trend of the super capacitor module, to control the opening and closing of the first switch and the second switch.

[0064] In one implementation of the embodiments of the present application, the output signal value of the photovoltaic module is the output voltage of the photovoltaic module, the output signal value of the super capacitor module is the output voltage of the super capacitor module, and the output signal of the control module is the input voltage of the control module.

[0065] In one implementation of the embodiments of the present application, the output signal value of the photovoltaic module is the output current of the photovoltaic module, the output signal value of the super capacitor module is the output current of the super capacitor module, and the output signal of the control module is the input current of the control module.

[0066] In one implementation of the embodiments of the present application, the output signal value of the photovoltaic module is the output power of the photovoltaic module, the output signal value of the super capacitor module is the output power of the super capacitor module, and the output signal of the control module is the input power of the control module.

[0067] In one implementation of the embodiments of the present application, the super capacitor module includes a plurality of super capacitors, and each of the super capacitors is connected in series with each other.

[0068] In one implementation of the embodiment of the application, the super capacitor module comprises a plurality of super capacitors, and each of the super capacitors is connected in parallel with each other.

[0069] In one implementation of the embodiment of the application, the super capacitor module comprises a plurality of super capacitors, and each of the super capacitors is connected in parallel with each other.

[0070] In the embodiment of the application, when the output signal value of the photovoltaic module is greater than or equal to the first threshold value of the input signal of the control module, the micro control unit controls the first switch to be turned off, so that the photovoltaic module is connected with the control module, that is, the photovoltaic module directly supplies power to the control module.

[0071] In the embodiment of the application, when the output signal value of the photovoltaic module is less than the first threshold value of the input signal of the control module, the micro control unit controls the first switch to be turned on, so that the photovoltaic module is connected with the super capacitor module, that is, the photovoltaic module supplies power to the control module through the super capacitor module.

[0072] In the embodiment of the application, when the output signal value of the super capacitor module shows an upward trend and rises to the second threshold value of the input signal of the control module, the micro control unit controls the second switch to be turned on, so that the super capacitor module is connected with the control module, that is, the super capacitor module starts to discharge to supply power to the control module.

[0073] In the embodiment of the application, when the output signal value of the super capacitor module shows a downward trend and is greater than the first threshold value of the input signal of the control module, the micro control unit controls the second switch to be continuously turned on, so that the super capacitor module is continuously connected with the control module, that is, the super capacitor module continuously discharges to supply power to the control module.

[0074] In the embodiment of the application, when the output signal value of the super capacitor module shows a downward trend and falls to the first threshold value of the input signal of the control module, the micro control unit controls the second switch to be continuously turned off, so that the super capacitor module is disconnected with the control module, that is, the super capacitor module stops discharging and starts to discharge.

[0075] In the embodiment of the application, the control module is an inverter.

[0076] Exemplary control method

[0077] FIG. 2 is a flowchart of a control method of an all-weather photovoltaic power generation system according to some embodiments of the application. As shown in FIG. 2, the exemplary control method is performed by using the control device described above, and comprises

[0078] In step S1, the output signal value of the photovoltaic module is collected.

[0079] Step S2, comparing the output signal value of the photovoltaic module with the size of the input signal first threshold value of the control module;

[0080] Step S3, controlling the closing and opening of the first switch.

[0081] In the embodiment of the present application, step S1, the output signal value of the photovoltaic module is collected; specifically, the output signal value of the photovoltaic module is collected by using the first collection unit. The output signal value of the photovoltaic module can be the output voltage, output current or output power of the photovoltaic module.

[0082] In the embodiment of the present application, step S3, the closing and opening of the first switch is controlled; specifically,

[0083] If the output signal value of the photovoltaic module is greater than or equal to the input signal first threshold value of the control module, the first switch is opened, so that the photovoltaic module is connected with the control module and the photovoltaic module directly generates power for the control module;

[0084] If the output signal value of the photovoltaic module is less than the input signal first threshold value of the control module, the first switch is closed, so that the photovoltaic module is connected with the super capacitor module and the photovoltaic module generates power for the control module through the super capacitor module.

[0085] Fig. 3 is a flow chart of a super capacitor module charging and discharging method according to some embodiments of the present application. As shown in Fig. 3, in the embodiment of the present application, the photovoltaic module generates power for the control module through the super capacitor module, specifically,

[0086] The output signal value and its change trend of the super capacitor module are collected;

[0087] The output signal value of the super capacitor module is compared with the size of the input signal first threshold value and the second threshold value of the control module, and the change state of the output signal value of the super capacitor module is determined.

[0088] The closing and opening of the second switch is controlled.

[0089] In one implementation of the embodiment of the present application, the output signal value of the super capacitor module shows an upward trend and rises to the input signal second threshold value of the control module, so that the second switch is closed, so that the super capacitor module is connected with the control module, that is, the super capacitor module starts to discharge to supply power to the control module.

[0090] In one implementation of the embodiment of the present application, the output signal value of the super capacitor module shows a downward trend and is greater than the input signal first threshold value of the control module, so that the second switch is continuously closed, so that the super capacitor module is continuously connected with the control module, that is, the super capacitor module continuously discharges to supply power to the control module.

[0091] In one implementation of the embodiment of the present application, when the output signal value of the super capacitor module presents a downward trend and falls to the first threshold value of the input signal of the control component, the second switch is turned off, so that the super capacitor module is disconnected from the control component, i.e. the super capacitor stops discharging and charges again.

[0092] It should be understood that the embodiments disclosed herein are not intended to be limited to the particular process steps or materials disclosed herein but are also intended to include any equivalents thereto. It should also be understood that the use of the terms "include", "have", "with", or "comprising" or "comprises" when used in this specification, specifies the presence of the stated features, or characteristics but does not preclude the presence or addition of one or more other features, characteristics, or steps.

[0093] It is noted that, as used in this specification and the appended claims, the singular forms "a", "an", and "the" include plural referents unless the context clearly dictates otherwise. Thus for example, reference to "a component" includes a combination of two or more components, and the term "the element" is not limited to a single element but includes two or more elements unless the context clearly indicates otherwise.

[0094] Furthermore, the described features or characteristics can be combined in any other suitable manner in one or more embodiments. In the above description, specific details of particular embodiments are provided to provide a thorough understanding of embodiments of the application. However, one skilled in the relevant art will understand that the application can be practiced without one or more of the specific details, or with other methods, components, materials, etc.

Claims

1. A control device for an all-weather photovoltaic power generation system, characterized by comprising: The method comprises a first acquisition unit for acquiring an output signal value of the photovoltaic module; a second acquisition unit for acquiring an output signal value of the super capacitor module and its change trend; a first switch for controlling whether the photovoltaic module is connected with the super capacitor module; a second switch for controlling whether the super capacitor module is connected with the control module; a micro control unit for storing, processing and analyzing the output signal value of the photovoltaic module and the output signal value of the super capacitor module and its change trend, so as to control the opening and closing of the first switch and the second switch.

2. The control device for an all-weather photovoltaic power generation system according to claim 1, characterized by, The output signal value of the photovoltaic module is the output voltage, output current or output power of the photovoltaic module.

3. The control device for an all-weather power generation system according to claim 1, characterized by, The output signal value of the super capacitor module is the output voltage, output current or output power of the super capacitor module.

4. The control device for an all-weather power generation system according to claim 1, characterized by, When the output signal value of the photovoltaic module is greater than or equal to the first threshold value of the input signal of the control module, the micro control unit controls the first switch to be opened, so that the photovoltaic module is connected with the control module.

5. The control device for an all-weather power generation system according to claim 1, characterized by, When the output signal value of the photovoltaic module is less than the first threshold value of the input signal of the control module, the micro control unit controls the first switch to be closed, so that the photovoltaic module is connected with the super capacitor module.

6. The control device for an all-weather power generation system according to claim 1, wherein When the output signal value of the super capacitor module shows an upward trend and rises to the second threshold value of the input signal of the control module, the micro control unit controls the second switch to be closed, so that the super capacitor module is connected with the control module.

7. The control device for an all-weather power generation system according to claim 1, wherein When the output signal value of the super capacitor module shows a downward trend and is greater than the first threshold value of the input signal of the control module, the micro control unit controls the second switch to be continuously closed, so that the super capacitor module is continuously connected with the control module.

8. The control device for an all-weather power generation system according to claim 1, characterized by, When the output signal value of the super capacitor module shows a downward trend and falls to the first threshold value of the input signal of the control module, the micro control unit controls the second switch to be continuously opened, so that the super capacitor module is disconnected from the control module.

9. A control method of an all-weather photovoltaic power generation system, characterized by, The method is performed by using the control device of any one of claims 1-8, comprising acquiring an output signal value of the photovoltaic module; comparing the output signal value of the photovoltaic module with the first threshold value of the input signal of the control module; controlling the closing and opening of the first switch.

10. The control method of an all-weather photovoltaic power generation system according to claim 9, characterized by, If the output signal value of the photovoltaic module is greater than or equal to the first threshold value of the input signal of the control module, the first switch is opened, so that the photovoltaic module is connected with the control module and the photovoltaic module directly generates power for the control module.

11. The control method of an all-weather photovoltaic power generation system according to claim 10, characterized by, If the output signal value of the photovoltaic module is less than the first threshold value of the input signal of the control module, the first switch is closed, so that the photovoltaic module is connected with the super capacitor module and the photovoltaic module generates power for the control module through the super capacitor module.

12. The control method of an all-weather photovoltaic power generation system according to claim 11, characterized by, The photovoltaic module generates power for the control module through the super capacitor module, specifically comprising acquiring an output signal value of the super capacitor module and its change trend; comparing the output signal value of the super capacitor module with the first threshold value and the second threshold value of the input signal of the control module, and judging the change state of the output signal value of the super capacitor module; controlling the closing and opening of the second switch.

13. The control method of an all-weather photovoltaic power generation system according to claim 12, characterized by, If the output signal value of the super capacitor module shows an upward trend and rises to the second threshold value of the input signal of the control component, the second switch is closed to connect the super capacitor module with the control component; If the output signal value of the super capacitor module shows a downward trend and is greater than the first threshold value of the input signal of the control component, the second switch is continuously closed to continuously connect the super capacitor module with the control component; If the output signal value of the super capacitor module shows a downward trend and falls to the first threshold value of the input signal of the control component, the second switch is opened to disconnect the super capacitor module from the control component.

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