Power output control system for intelligent photovoltaic power generation

Abstract

The utility model discloses a power output control system for intelligent photovoltaic power generation, which relates to the technical field of photovoltaic power generation and comprises MPPT (maximum power point tracking) equipment used for carrying an MPPT algorithm, externally connected with a photovoltaic power supply and used for outputting results of the MPPT algorithm through analog signals; the PLC module is provided with an analog signal input end and a power supply input end; the analog signal input end is in signal connection with MPPT equipment, and the analog signal input end receives an analog signal transmitted by the MPPT equipment; the power supply input end is externally connected with a photovoltaic power supply, and the power supply input end obtains electric energy through the photovoltaic power supply; the PLC module is further provided with a plurality of power output ends, the power output ends are used for being externally connected with electric equipment, the PLC module is externally connected with MPPT equipment, the current optimal output power is obtained through an MPPT algorithm, then the PLC board conducts control according to analog signals output by the MPPT equipment, and electric power is transmitted to different numbers of electric equipment according to conditions.

Description

Technical Field

[0001] The utility model belongs to the technical field of photovoltaic power generation, and particularly relates to an intelligent photovoltaic power generation power output control system. Background Art

[0002] Photovoltaic power is commonly used for outdoor power supply, for example, in the power supply of lighting and other equipment, the application of photovoltaic power supply has become more and more widespread. However, photovoltaic power supply is unstable. Therefore, when using photovoltaic power supply outdoors, it is necessary to store energy before power supply. Alternatively, the photovoltaic power supply can be used directly and the excess energy can be stored. This method can not only solve the problem of unstable photovoltaic power supply, but also improve energy utilization efficiency and reduce energy waste.

[0003] Regardless of the method, the photovoltaic power source needs to output to the electrical equipment (battery charging can be regarded as an electrical equipment). Due to the characteristics of the photovoltaic power source, its output power will affect its own power generation effect at the current moment, so it is necessary to solve the technical problem of how to intelligently control the output power of the photovoltaic power source. Utility Model Content

[0004] In view of the above problems, the utility model discloses a

[0005] An intelligent photovoltaic power output control system, the system is used to connect to a photovoltaic power source, and is characterized in that the system includes:

[0006] An MPPT device, wherein the MPPT device is used to carry an MPPT algorithm, the MPPT device is externally connected to a photovoltaic power source, and the MPPT device outputs the result of the MPPT algorithm through an analog signal;

[0007] A PLC module is provided with an analog signal input terminal and a power input terminal; the analog signal input terminal is connected to the MPPT device signal, and the analog signal transmitted by the MPPT device signal is received by the analog signal input terminal; the power input terminal is externally connected to a photovoltaic power supply, and the power input terminal obtains electric energy through the photovoltaic power supply; the PLC module is also provided with a plurality of power output terminals, and the power output terminals are used for external electrical equipment.

[0008] In an exemplary embodiment, a DI module is further connected between the MPPT device and the PLC module, and a signal connection is established between the DI module and the MPPT device;

[0009] The DI module is used to receive the analog signal sent by the MPPT device;

[0010] The DI module is used to convert the analog signal into a digital signal, and the DI module is signal-connected to the PLC module;

[0011] The DI module is also used to send digital signals to the PLC module.

[0012] In an exemplary embodiment, the PLC module further includes a determination module, and the determination module is used to process the digital signal input by the DI module.

[0013] In an exemplary embodiment, the PLC module further includes a gating module, the gating module is connected to the power inputted by the power input terminal, and the gating module is signal-connected to the judgment module;

[0014] The gating module is used for gating the power input terminal and different power output terminals.

[0015] In an exemplary embodiment, a regulating module is further provided between the power output terminal and the power-consuming device;

[0016] The PLC module also includes an adjustment instruction output terminal, which is used to output the adjustment instruction, and the adjustment instruction output terminal is connected to the adjustment module by signal;

[0017] The regulating module is used to regulate the voltage and current output to the electrical device according to the regulating instruction.

[0018] In an exemplary embodiment, the PLC module is a PLC board, the analog signal input terminal is an input pin, and the power output terminal is an output pin.

[0019] In an exemplary embodiment, the PLC module is a PLC board, the analog signal input terminal is an input pin, the power output terminal is a part of the output pin, and the adjustment instruction output terminal is a part of the output pin.

[0020] In an exemplary embodiment, the PLC module is also externally connected to an independent power supply.

[0021] The beneficial effect of the utility model is that the PLC module is externally connected to the MPPT device, the current optimal output power is obtained through the MPPT algorithm, and then the PLC board is controlled according to the analog signal output by the MPPT device to transmit power to different numbers of electrical devices according to the situation.

[0022] In addition, the analog signal output by the MPPT device can be converted into a digital signal that can be processed by the adjustment module, and then the output voltage and current are adjusted so that the output power meets the result of the MPPT algorithm to ensure the power generation efficiency of the photovoltaic power source.

[0023] Other features and advantages of the utility model will be described in the following description, and partly become apparent from the description, or understood by implementing the utility model. The purpose and other advantages of the utility model can be realized and obtained by the structures indicated in the description, claims and drawings. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] In order to more clearly illustrate the embodiments of the utility model or the technical solutions in the prior art, the drawings required for use in the embodiments or the description of the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the utility model. For ordinary technicians in this field, other drawings can be obtained based on these drawings without paying creative work.

[0025] Figure 1 An intelligent photovoltaic power output control system according to an embodiment of the utility model is shown;

[0026] Figure 2 An intelligent photovoltaic power output control system according to an embodiment of the utility model is shown;

[0027] Figure 3 An intelligent photovoltaic power output control system according to an embodiment of the utility model is shown;

[0028] Figure 4 A schematic diagram showing a part of a power output control system for intelligent photovoltaic power generation according to an embodiment of the utility model is shown;

[0029] Figure 5 A schematic diagram showing a part of a power output control system for intelligent photovoltaic power generation according to an embodiment of the utility model is shown.

[0030] In the attached figure:

[0031] 1- analog signal input terminal, 2- power input terminal, 3- adjustment command output terminal, 4- power output terminal 4, 5- independent power supply, 6- DI chip, 7- PLC board. DETAILED DESCRIPTION

[0032] In order to make the purpose, technical solution and advantages of the embodiment of the utility model clearer, the technical solution in the embodiment of the utility model will be clearly and completely described below in conjunction with the drawings in the embodiment of the utility model. Obviously, the described embodiment is a part of the embodiment of the utility model, not all of the embodiments. Based on the embodiment of the utility model, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the utility model.

[0033] First embodiment

[0034] In order to improve the working efficiency of photovoltaic power source, this embodiment discloses a power output control system of intelligent photovoltaic power generation, which can be referred to Figure 1 The system is connected to a photovoltaic power source, and includes: an MPPT device carrying an MPPT algorithm, the MPPT device is connected to the photovoltaic power source, and the result of the MPPT algorithm is output as an analog signal.

[0035] The maximum power point tracking (MPPT) technology in the existing technology can optimize the performance of photovoltaic power sources. MPPT equipment and its algorithm are mature and reliable means to improve the output power of photovoltaic power sources in the existing technology. For example, MPPT equipment can dynamically adjust the working state of photovoltaic power sources according to real-time environmental conditions, such as light intensity, temperature and other factors, to obtain the optimal output power. The output power is adjusted through the intelligent algorithm mechanism to ensure the power generation efficiency of photovoltaic equipment.

[0036] In this example, the MPPT device converts the optimal output power at the current moment obtained by the MPPT algorithm into a corresponding analog signal, and the analog signal may include a voltage analog signal, a current analog signal, and the like.

[0037] The control system also includes a PLC module, which includes: an analog signal input terminal 1, which is connected to the MPPT device signal and transmits the analog signal. Combined with the above content, it can be seen that the analog signal output by the MPPT device corresponds to the output power that is currently most suitable for photovoltaic device power generation. The PLC module also includes a power input terminal 2, which is connected to the photovoltaic power supply. And multiple power output terminals 4, each of which is externally connected to the power-consuming device.

[0038] The PLC module can make a real-time judgment based on the input analog signal and dynamically adjust the connection state of the power output terminal 4. For example, when multiple lighting lamps are connected externally, according to the results sent by the MPPT device, when the output current and output voltage are required to be low, the PLC module will only connect a limited number of lighting lamps to ensure the effective use of electricity and the stable operation of the equipment.

[0039] In the above process, PLC module is a common technical means to realize the corresponding functions, and the corresponding logic control can be realized through any PLC programming language.

[0040] In some specific examples, a DI module is further connected between the MPPT device and the PLC module, and the DI module is signal-connected to the MPPT device to transmit the analog signal. The DI module converts the analog signal into a digital signal, and the DI module is signal-connected to the PLC module to transmit the digital signal.

[0041] Second embodiment

[0042] Based on the above implementation, in this example, the PLC module also includes a judgment module, which is used to process the digital signal input by the DI module and output control instructions. When working, when the MPPT device obtains the current optimal output power through its algorithm and outputs this result in the form of an analog signal, the DI module converts the analog signal into a digital signal. Subsequently, the digital signal is transmitted to the judgment module of the PLC module.

[0043] Specifically, the judgment module can perform in-depth analysis and processing on the input digital signal according to preset algorithms and logical rules.

[0044] In one example, based on the output voltage and current values ​​recommended by the MPPT device (the information carried by the analog signal has been converted into a processable digital signal), combined with the actual needs and status of the electrical equipment in the current system, it is calculated how many electrical equipment should be powered on. For example, when the light conditions are good and the power generated by the photovoltaic power source is sufficient, the judgment module will decide to power on more electrical equipment to meet the higher power demand; conversely, in the case of insufficient light or power shortage, the judgment module may give priority to ensuring the power supply of key equipment, while shutting down or reducing the power consumption of non-key equipment.

[0045] Third embodiment

[0046] Based on the above embodiments, this example can refer to Figure 2 It is understood that the PLC module also includes a gating module, which turns on the power input by the power input terminal 2, and the gating module is signal-connected to the judgment module.

[0047] As described in the second embodiment, the control instruction includes a gating instruction, which is output by the judgment module, and the judgment module can be a module for processing PLC programs in the PLC board 7. The control instruction is transmitted between the gating module and the judgment module. In a specific example, the gating module is a specific program module for executing instructions. In this example, the gating module is used to: select the power input terminal 2 and the different power output terminals 4 according to the control instruction.

[0048] Fourth embodiment

[0049] Based on the above embodiments, this example can refer to Figure 3It is understood that a regulating module is also provided between the power output terminal 4 and the power-consuming device. In this example, the regulating module is a voltage / current regulating module, which can be a digital voltage and current regulator, which can quickly respond to the regulating instructions issued by the PLC module, and has a digital signal processing unit integrated inside, which can easily convert the digital signal output by the PLC module into an actual instruction for regulating the voltage and current output, and then regulate the output power.

[0050] The control instructions also include adjustment instructions. As mentioned in the above embodiments, the analog signal receiving end has actually received the optimal output current and voltage sent by the MPPT device. The DI module has converted it into a digital signal that can be processed by the hardware. In fact, in this example, the PLC module can serve as a transit to further convert the aforementioned digital signal into a signal that can be processed by the adjustment module. Therefore, the adjustment module can adjust the actual output voltage and current according to the optimal output voltage and current sent by the MPPT device.

[0051] Combination Figure 3 The PLC module further comprises an adjustment instruction output terminal 3, which is used to output the adjustment instruction, and the adjustment instruction output terminal is connected to the adjustment module by signal. The adjustment module is used to adjust the voltage and current output to the electrical equipment according to the adjustment instruction.

[0052] In some specific examples, the judgment module may also process and output the adjustment instruction and the selection instruction. For example, when the user requires a certain number of electrical devices to maintain power consumption through external input instructions, the judgment module needs to perform reasonable power distribution based on these requirements and the optimal output power information sent by the MPPT device.

[0053] In this process, the judgment module will first determine the number of electrical devices that need to be connected, and then calculate the voltage and current values ​​that each device should obtain based on the actual power requirements of these devices and the recommended output power of the MPPT device. Subsequently, the parameter values ​​are converted into specific adjustment instructions and gating instructions, and sent to the adjustment module and gating switch through the corresponding output terminals.

[0054] Fifth embodiment

[0055] Based on the above embodiments, in this example, reference can be made to Figure 4 For understanding, the PLC module is a PLC board 7, the analog signal input terminal 1 is an input pin, and the power output terminal 4 is an output pin. In the subsequent examples, the DI module is a DI chip 6 of the EMQR16 model, and the specific pin connection method of the DI chip 6 is not repeated, and is understood by referring to the diagram.

[0056] In a specific example, the PLC board 7 is PLC:12DI / 8DO, and the specification model is CPU SR20, 6ES72881SR200AA0. The pins in the DQa area are the pins of the analog signal input terminal 1, namely pins Q0.0-Q9.2. In different situations, each pin is connected to a different output terminal of the MPPT device (not shown in the figure), or connected to the output pin of the DI device. PE and N as shown in the figure are the neutral line and the live line, and L02 is externally connected to the photovoltaic power supply. Pins I1.3-10.0 are respectively connected to different electrical equipment, and the on-off is realized according to the result of the segment judgment module, and DC0V is the ground wire.

[0057] In some other specific examples, the PLC module is a PLC board 7, the analog signal input terminal 1 is an input pin, the power output terminal 4 is a part of the output pin, and the adjustment instruction output terminal 3 is a part of the output pin. Figure 5 As shown, the power output terminal 4 is the pin of area A, i.e., pins I0.0-I0.7. The control instruction output terminal is the pin of area B, i.e., pins I1.1-I1.3. In this example, the electrical equipment connected to the PLC board 7 is the same type of lighting lamps, so one pin of area B can correspond to multiple regulating modules for unified current and voltage regulation.

[0058] In the specific example shown in the figure, the PLC module is also connected to an independent power supply 5, such as Figure 4 In the case shown in Figure 5 or Figure 6, a 48V independent power supply 5 is connected. In this example, the photovoltaic power processed by the PLC module does not power the PLC board 7.

[0059] Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art should understand that they can still modify the technical solutions described in the aforementioned embodiments, or make equivalent replacements for some of the technical features therein; and these modifications or replacements do not make the essence of the corresponding technical solutions deviate from the spirit and scope of the technical solutions of the embodiments of the present invention.

Claims

1. An intelligent photovoltaic power output control system, the system is used to connect to a photovoltaic power source, characterized in that the system include: An MPPT device, wherein the MPPT device is used to carry an MPPT algorithm, the MPPT device is externally connected to a photovoltaic power source, and the MPPT device outputs the result of the MPPT algorithm through an analog signal; A PLC module is provided with an analog signal input terminal (1) and a power input terminal (2); the analog signal input terminal (1) is connected to the MPPT device signal, and the analog signal input terminal (1) receives the analog signal transmitted by the MPPT device signal; the power input terminal (2) is externally connected to a photovoltaic power source, and the power input terminal (2) obtains electric energy through the photovoltaic power source; the PLC module is also provided with a plurality of power output terminals (4), and the power output terminals (4) are used for externally connecting to electrical equipment.

2. The power output control system of the intelligent photovoltaic power generation according to claim 1, characterized in that: A DI module is also connected between the MPPT device and the PLC module, and a signal connection is provided between the DI module and the MPPT device; The DI module is used to receive the analog signal sent by the MPPT device; The DI module is used to convert the analog signal into a digital signal, and the DI module is signal-connected to the PLC module; the DI module is also used to send a digital signal to the PLC module.

3. The power output control system of the intelligent photovoltaic power generation according to claim 2 is characterized in that: The PLC module also includes a judgment module, which is used to process the digital signal input by the DI module.

4. The power output control system of the intelligent photovoltaic power generation according to claim 3 is characterized in that: The PLC module further comprises a gating module, the gating module is connected to the power inputted by the power input terminal (2), and a signal connection is provided between the gating module and the judging module; The gating module is used to gating the power input terminal (2) and different power output terminals (4).

5. The power output control system of the intelligent photovoltaic power generation according to claim 4, characterized in that: A regulating module is also provided between the power output terminal (4) and the power-consuming device; The PLC module further comprises an adjustment instruction output terminal (3), the adjustment instruction output terminal (3) being used to output the adjustment instruction, and the adjustment instruction output terminal is signal-connected to the adjustment module; The regulating module is used to regulate the voltage and current output to the electrical device according to the regulating instruction.

6. The power output control system of the intelligent photovoltaic power generation according to claim 4 or 5, characterized in that: The PLC module is a PLC board (7), the analog signal input terminal (1) is an input pin, and the power output terminal (4) is an output pin.

7. The power output control system of the intelligent photovoltaic power generation according to claim 5, characterized in that: The PLC module is a PLC board (7), the analog signal input terminal (1) is an input pin, the power output terminal (4) is a part of the output pin, and the adjustment instruction output terminal (3) is a part of the output pin.

8. The power output control system of the intelligent photovoltaic power generation according to claim 5, characterized in that: The PLC module is also externally connected to an independent power supply (5).

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