CN116317069B

CN116317069B - Photovoltaic electric energy output control method, device, equipment, inverter and battery

Info

Publication number: CN116317069B
Application number: CN202310592783.6A
Authority: CN
Inventors: 邰小俊; 蔡慧明; 李湘涛; 钱兴; 廖志雄; 张凡; 郎建军; 孙冉冉
Original assignee: Suzhou Tongtai New Energy Technology Co ltd
Current assignee: Suzhou Tongtai New Energy Technology Co ltd
Priority date: 2023-05-24
Filing date: 2023-05-24
Publication date: 2023-08-11
Anticipated expiration: 2043-05-24
Also published as: CN116317069A

Abstract

The application relates to a photovoltaic electric energy output control method, a device, equipment, an inverter and a battery. Comprising the following steps: obtaining output voltage of each photovoltaic cell group; comparing the accumulation of the output voltages of the photovoltaic cell slice groups with the preset output voltage of the photovoltaic cell; the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with a preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel. The photovoltaic power output control method, the device, the equipment, the inverter and the battery provided by the embodiment of the application can stabilize the output of the photovoltaic battery.

Description

Photovoltaic electric energy output control method, device, equipment, inverter and battery

Technical Field

The application relates to the technical field of photovoltaics, in particular to a photovoltaic electric energy output control method, a device, equipment, an inverter and a battery.

Background

Photovoltaic cells are a new type of cell that converts the light energy of the sun directly into electrical energy. Silicon photovoltaic cells based on silicon are currently commonly used, including monocrystalline silicon, polycrystalline silicon and amorphous silicon photovoltaic cells.

When one or more of the photovoltaic cells are shaded, without solar illumination, the shaded photovoltaic cells will consume energy generated by other illuminated photovoltaic cells and will heat, a condition known as the hot spot effect. The hot spot effect can seriously damage the photovoltaic cell and can affect the stable output of the photovoltaic cell.

Disclosure of Invention

In view of the above, the embodiments of the present application provide a photovoltaic power output control method, device, apparatus, inverter and battery to solve the technical problems existing in the background art.

In order to achieve the above purpose, the technical scheme of the application is realized as follows:

in a first aspect, an embodiment of the present application provides a photovoltaic power output control method, including:

obtaining output voltage of each photovoltaic cell group;

comparing the accumulation of the output voltages of the photovoltaic cell slice groups with the preset output voltage of the photovoltaic cell;

the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel.

Optionally, before the first photovoltaic cell set is connected to the electrical energy output end of the photovoltaic cell and the second photovoltaic cell set is disconnected from the electrical energy output end, the method further includes:

connecting the compensation photovoltaic cell slice group to an electric energy output end of the photovoltaic cell; the compensation photovoltaic cell pack is a photovoltaic cell pack capable of adjusting output voltage; the compensation photovoltaic cell group belongs to the first photovoltaic cell group.

Optionally, the first photovoltaic cell group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell group is disconnected with the electric energy output end, including:

sequencing each photovoltaic cell group according to the output voltage;

sequentially accumulating the output voltages of the photovoltaic cell packs sequenced in front on the basis of accumulating the output voltages of the compensation photovoltaic cell packs until the difference value between the accumulated value and the preset output voltage is smaller than a second preset value; the second preset value is larger than the first preset value;

the compensation photovoltaic cell group and the photovoltaic cell groups which participate in accumulation are listed in the first photovoltaic cell group, and the rest photovoltaic cell groups are listed in the second photovoltaic cell group.

Optionally, the conducting the first photovoltaic cell set with the power output end of the photovoltaic cell, disconnecting the second photovoltaic cell set with the power output end, includes:

and adjusting the output voltage of the compensation photovoltaic battery pack to enable the difference value between the output voltage of the electric energy output end and the preset output voltage to be smaller than a first preset value.

Optionally, the adjusting the output voltage of the compensation photovoltaic cell group includes:

the duty ratio of a buck conversion circuit in the compensation photovoltaic cell pack is adjusted to adjust the output voltage of the compensation photovoltaic cell pack; the compensation photovoltaic cell pack comprises a photovoltaic cell pack and the buck conversion circuit; the step-down conversion circuit comprises a step-down element and an energy storage element, wherein the step-down element steps down the output voltage of the photovoltaic battery pack and outputs the output voltage; the energy storage element can combine and output the electric energy stored by the energy storage element per se, and gradually increases the output value along with the increase of the conduction time of the buck conversion circuit so as to adjust the output voltage of the compensation photovoltaic battery pack through the duty ratio.

In a second aspect, an embodiment of the present application provides a photovoltaic power output control device, including:

The acquisition module is used for acquiring the output voltage of each photovoltaic cell group;

the comparison module is used for comparing the accumulation of the output voltages of the photovoltaic cell pieces with the preset output voltage of the photovoltaic cell;

the execution module is used for conducting the first photovoltaic cell set with the electric energy output end of the photovoltaic cell and disconnecting the second photovoltaic cell set with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel.

In a third aspect, an embodiment of the present application provides a control apparatus, including:

the control component is used for acquiring the output voltage of each photovoltaic cell group; comparing the accumulation of the output voltages of the photovoltaic cell slice groups with the preset output voltage of the photovoltaic cell; the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group with a plurality of output voltages which are added up to be larger than or equal to the preset output voltage and are connected in series, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel;

The communication component is used for sending an instruction for obtaining the output voltage of each photovoltaic cell pack to the photovoltaic cell pack and forwarding the received output voltage of the photovoltaic cell pack to the control component; and transmitting an instruction which is transmitted by the control component and used for conducting the first photovoltaic cell set with the electric energy output end of the photovoltaic cell and disconnecting the second photovoltaic cell set with the electric energy output end to the photovoltaic cell set.

In a fourth aspect, embodiments of the present application provide a computing device, the computing device comprising: memory, communication bus, and processor, wherein:

the memory is used for storing a photovoltaic electric energy output control method program;

the communication bus is used for realizing connection communication between the memory and the processor;

the processor is configured to execute a photovoltaic power output control method program to implement the steps of any of the methods described above.

In a fifth aspect, embodiments of the present application provide a computer readable storage medium having stored thereon an executable program which when executed by a processor performs the steps of any of the methods described above.

In a sixth aspect, an embodiment of the present application provides a photovoltaic inverter, including:

the control component is used for acquiring the output voltage of each photovoltaic cell group; comparing the accumulation of the output voltages of the photovoltaic cell slice groups with the preset output voltage of the photovoltaic cell; the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel;

the first communication component is used for sending an instruction for obtaining the output voltage of each photovoltaic cell pack to the photovoltaic cell pack and forwarding the received output voltage of the photovoltaic cell pack to the control component; the method comprises the steps that a first photovoltaic cell pack and an electric energy output end of a photovoltaic cell of a control component are conducted, and a command for disconnecting a second photovoltaic cell pack from the electric energy output end is sent to the photovoltaic cell packs;

And the inversion component is used for converting direct current output by the first photovoltaic battery pack connected to the electric energy output end into alternating current.

In a seventh aspect, an embodiment of the present application provides a photovoltaic cell, including:

the photovoltaic cell pieces are connected in series; each photovoltaic cell group comprises a connecting component, a bypass component and a second communication component; the connecting component is positioned on the path of input or output of the photovoltaic cell pack, and the bypass component is connected with the input end and the output end of the photovoltaic cell pack at the same time;

the electric energy output end is connected with the photovoltaic cell slice group;

the photovoltaic inverter is positioned between the photovoltaic cell pack and the electric energy output end; the first communication component and the second communication component establish communication connection; the photovoltaic inverter obtains output voltages of the photovoltaic cell packs through the communication connection, and conducts the first photovoltaic cell pack with the electric energy output end and disconnects the second photovoltaic cell pack with the electric energy output end according to the condition of the output voltages; the connecting component is conducted under the condition that the first photovoltaic battery pack is conducted with the electric energy output end; and under the condition that the second photovoltaic battery pack is disconnected from the electric energy output end, the connecting component is disconnected, and the bypass component is conducted.

Optionally, the photovoltaic cell pack includes a compensation photovoltaic cell pack, the compensation photovoltaic cell pack being connected to the electrical energy output; the compensation photovoltaic cell group is a photovoltaic cell group capable of adjusting output voltage and belongs to the first photovoltaic cell group.

Optionally, the compensation photovoltaic cell set comprises a photovoltaic cell set and a buck conversion circuit; the step-down conversion circuit comprises a step-down element and an energy storage element, wherein the step-down element steps down the output voltage of the photovoltaic battery pack and outputs the output voltage; the energy storage element can combine and output the electric energy stored by the energy storage element per se, and gradually increases the output value along with the increase of the conduction time of the buck conversion circuit so as to adjust the output voltage of the compensation photovoltaic battery pack through the duty ratio.

The photovoltaic electric energy output control method, device, equipment, inverter and battery provided by the embodiment of the application comprise the following steps: obtaining output voltage of each photovoltaic cell group; the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel. Wherein, the first photovoltaic cell slice group which is connected in series and has a plurality of output voltages which are accumulated to be larger than or equal to the preset output voltage is conducted with the electric energy output end of the photovoltaic cell, and disconnecting the other second photovoltaic cell slice groups from the electric energy output end, so that the output of the photovoltaic cells is stable. Therefore, the photovoltaic power output control method, the device, the equipment, the inverter and the battery provided by the embodiment of the application can stabilize the output of the photovoltaic battery.

Additional aspects and advantages of the application will be set forth in part in the description which follows and, in part, will be obvious from the description, or may be learned by practice of the application.

Drawings

The accompanying drawings, which are included to provide a further understanding of the application and are incorporated in and constitute a part of this specification, illustrate embodiments of the application and together with the description serve to explain the application and do not constitute a limitation on the application. In the drawings:

fig. 1 is a schematic flow chart of a photovoltaic power output control method according to an embodiment of the present application;

fig. 2 is a detailed flowchart of a photovoltaic power output control method according to an embodiment of the present application;

fig. 3 is a schematic structural diagram of a photovoltaic power output control device according to an embodiment of the present application;

FIG. 4 is a schematic diagram of a computing device according to an embodiment of the present application;

fig. 5 is a schematic structural diagram of a photovoltaic inverter according to an embodiment of the present application;

fig. 6 is a schematic structural diagram of a photovoltaic cell according to an embodiment of the present application.

Reference numerals illustrate:

300. a photovoltaic power output control device; 301. an acquisition module; 302. a comparison module; 303. an execution module; 500. a computing device; 501. a memory; 502. a communication bus; 503. a processor; 504. an input device; 505. an output device; 506. an external communication interface; 600. a photovoltaic inverter; 601. a control part; 602. a first communication section; 603. an inverter component; 800. a photovoltaic cell stack; 801. a connecting member; 802. a bypass member; 803. a second communication section; 900. compensating the photovoltaic cell slice group.

Detailed Description

Exemplary embodiments of the present disclosure will be described in more detail below with reference to the accompanying drawings. While exemplary embodiments of the application are shown in the drawings, it should be understood that the application may be embodied in various forms and should not be limited to the specific embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the scope of the disclosure to those skilled in the art.

In the following description, numerous specific details are set forth in order to provide a more thorough understanding of the present application. It will be apparent, however, to one skilled in the art that the application may be practiced without one or more of these details. In other instances, well-known features have not been described in detail so as not to obscure the application; that is, not all features of an actual implementation are described in detail herein, and well-known functions and constructions are not described in detail.

In order to provide a thorough understanding of the present application, detailed steps and detailed structures will be presented in the following description in order to explain the technical solution of the present application. Preferred embodiments of the present application are described in detail below, however, the present application may have other embodiments in addition to these detailed descriptions.

Example 1

The embodiment of the application provides a photovoltaic electric energy output control method. The method may be implemented by a computer, which may be a computing device configured with a processor, which may be a general purpose processor, a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. As shown in fig. 1, the method includes:

step 101: obtaining output voltage of each photovoltaic cell group;

step 102: comparing the accumulation of the output voltages of the photovoltaic cell slice groups with the preset output voltage of the photovoltaic cell;

step 103: the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel.

In this embodiment, the photovoltaic cell comprises: the photovoltaic cell pieces form a photovoltaic cell piece group, the photovoltaic cell piece group forms a photovoltaic cell assembly, and the photovoltaic cell assembly forms a photovoltaic cell matrix. In general, the photovoltaic cells are connected in series, either in the photovoltaic cell stack, the photovoltaic cell assembly, or in the photovoltaic cell matrix.

In the step 101, the output voltage of the photovoltaic cell is obtained, and two measurement ends of the measurement device may be respectively connected to two ends of the photovoltaic cell group, so as to obtain the voltage.

In step 102, the preset output voltage of the photovoltaic cell may be a standard voltage value set according to the requirement of the downstream device. The parameters that an inverter circuit, such as an inverter, needs to obtain a dc voltage are: 400V/1.5A (600W) and then inverted to 220V ac by an inverter. This 400V is the preset output voltage, which is typically lower than the maximum output voltage of the photovoltaic cell. Generally, in practical application, the preset output voltage of the photovoltaic cell is required to be stable, which is beneficial to the normal operation of facilities such as an inverter and a power transmission network of the photovoltaic cell. The first preset value may also be set according to the allowable fluctuation range of the downstream device.

It will be appreciated that the preset output voltage may also be set to a value above or below the standard voltage value, for example above or below 10%, or below the highest output voltage, as the case may be.

In step 103, the electrical energy output end of the photovoltaic cell may be the electrical energy output end of the entire photovoltaic cell matrix. In this embodiment, in order to make the voltage output of the photovoltaic cells relatively stable, a certain margin is provided in the number of photovoltaic cell groups, so that all photovoltaic cell groups do not need to be connected to the electric energy output end, and the output voltage is also greater than or equal to the preset output voltage. Thus, the photovoltaic cell pack capable of meeting the preset output voltage can be obtained by accumulating the photovoltaic cell packs, and the photovoltaic cell packs are connected to the electric energy output end. In addition, since the operating state, performance, and the like of the photovoltaic cell stack are changed, it is necessary to repeat the above steps at regular or irregular times.

In some embodiments, before said turning on the first photovoltaic cell set to the power output of the photovoltaic cell and turning off the second photovoltaic cell set to the power output, the method further comprises:

The compensation photovoltaic cell set is arranged for stabilizing the voltage output of the photovoltaic cell. The compensation photovoltaic cell pack is a photovoltaic cell pack capable of adjusting output voltage; the compensating photovoltaic cell slice group can be adjusted up and down. Thus, the first photovoltaic cell group is selected from the photovoltaic cell groups flexibly. Specifically, the compensating photovoltaic cell pack may be a circuit for setting a regulating voltage at an output end of a common photovoltaic cell pack, which is described in detail below. In some embodiments, turning on a first photovoltaic cell stack with an electrical energy output of a photovoltaic cell and turning off a second photovoltaic cell stack with the electrical energy output comprises:

sequencing each photovoltaic cell group according to the output voltage;

Generally, the output voltage of the photovoltaic cell pack is high, which means that the photovoltaic cell pack has good performance and good working condition, and can maintain relatively stable voltage output. Therefore, after sorting, the photovoltaic cell group with high output voltage is selected as the first photovoltaic cell group.

Specifically, before accumulating the photovoltaic cell groups with high voltage, the compensating photovoltaic cell groups are firstly listed into the first photovoltaic cell group, and then the photovoltaic cell groups with high voltage are accumulated sequentially. The output voltage of the compensation photovoltaic battery pack can be adjusted, so that the difference value between the accumulated power supply and the preset output voltage can be larger. The second preset value may be set according to a condition range of the compensated photovoltaic cell set.

In some embodiments, the switching on the first photovoltaic cell set and the electrical energy output terminal of the photovoltaic cell, and the switching off the second photovoltaic cell set and the electrical energy output terminal, includes:

Specifically, when the first photovoltaic cell group is selected, the output voltage of the compensation photovoltaic cell group can be adjusted in the middle of the adjustable range. Thus, the accumulated output voltage may be smaller than the preset output voltage or larger than the preset output voltage. After the first photovoltaic battery piece group is determined, the first photovoltaic battery piece group is adjusted according to the situation, and the difference between the output voltage of the electric energy output end and the preset output voltage can be smaller than a first preset value.

In some embodiments, the adjusting the output voltage of the compensating photovoltaic cell stack comprises:

Specifically, the voltage reducing element and the energy storage element may be the same element, for example, an inductor, when the voltage reducing element and the energy storage element are turned on, the photovoltaic cell starts to store energy for the inductor and outputs the energy to the inverter, but the current of the inductor cannot be suddenly changed, at the moment, the inductor can induce a voltage opposite to the power supply in order to prevent the current from increasing, and the inductor can counteract a part of the voltage, reduce the output voltage, and play a role in reducing the voltage. In addition, as time increases, the inductor is used as an energy storage element, the stored voltage is slowly released, and the voltage is combined and output to the output end, and the output value is gradually increased along with the increase of the on time of the buck conversion circuit. Thus, as the on-time increases, the output voltage is gradually increased.

More specifically, the Buck conversion circuit may be a Buck circuit.

For a further understanding of the method for protecting a photovoltaic cell according to an embodiment of the present application, a more specific embodiment will be described below, as shown in fig. 2, the method includes:

step 201: and obtaining the output voltage of each photovoltaic battery piece group.

Step 202: and sequencing the photovoltaic cell groups. And sequencing each photovoltaic battery slice group according to the output voltage.

Step 203: and the compensating photovoltaic cell slice group is listed into the first photovoltaic cell slice group.

Step 204: and determining a first photovoltaic cell slice group. And sequentially accumulating the compensation photovoltaic cell groups and sequencing the photovoltaic cell groups in the front, and sequentially listing the compensation photovoltaic cell groups into the first photovoltaic cell group until the difference value between the accumulated value and the preset output voltage is smaller than a second preset value. The photovoltaic cell packs participating in accumulation are listed in the first photovoltaic cell pack, and the rest photovoltaic cell packs are listed in the second photovoltaic cell pack.

Step 205: and performing on-off of the photovoltaic cell group. And conducting the first photovoltaic cell slice group with the electric energy output end of the photovoltaic cell, and disconnecting the second photovoltaic cell slice group from the electric energy output end.

Step 206: the output voltage of the photovoltaic cell is trimmed. And adjusting the output voltage of the compensation photovoltaic battery pack to enable the difference between the output voltage of the electric energy output end and the preset output voltage to be smaller than a first preset value.

It should be noted that, since the performance and the working condition of the photovoltaic cell may change, the above steps need to be repeatedly performed at regular or irregular time.

Example two

The present embodiment provides a photovoltaic power output control apparatus 300, as shown in fig. 3, including:

The acquisition module 301 is configured to acquire output voltages of each photovoltaic cell group;

the comparison module 302 is configured to compare an accumulation of output voltages of the plurality of photovoltaic cell pieces with a preset output voltage of the photovoltaic cell;

the execution module 303 is configured to conduct the first photovoltaic cell set with an electrical energy output end of the photovoltaic cell, and disconnect the second photovoltaic cell set from the electrical energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel.

In the above-mentioned obtaining module 301, the output voltage of the photovoltaic cell may be obtained, two measurement ends of the measuring device may be respectively connected to two ends of the photovoltaic cell group, the voltage and the current may be respectively obtained, and then the voltage may be obtained by calculation.

In the comparison module 302, the preset output voltage of the photovoltaic cell may be a standard voltage value set according to the requirement of the downstream device. The parameters that an inverter circuit, such as an inverter, needs to obtain a dc voltage are: 400V/1.5A (600W) and then inverted to 220V ac by an inverter. This 400V is the preset output voltage, which is typically lower than the maximum output voltage of the photovoltaic cell. Generally, in practical application, the preset output voltage of the photovoltaic cell is required to be stable, which is beneficial to the normal operation of facilities such as an inverter and a power transmission network of the photovoltaic cell. The first preset value may also be set according to the allowable fluctuation range of the downstream device. It will be appreciated that the preset output voltage may also be set to a value above or below the standard voltage value, for example above or below 10%, or below the highest output voltage, as the case may be.

In the executing module 303, the power output end of the photovoltaic cell may be the power output end of the whole photovoltaic cell matrix. In this embodiment, in order to make the voltage output of the photovoltaic cell relatively stable, a certain margin is provided on the number of photovoltaic cell groups. And the output voltage is larger than or equal to the preset output voltage without connecting all photovoltaic cell packs to the electric energy output end. Thus, the photovoltaic cell pack capable of meeting the preset output voltage can be obtained by accumulating the photovoltaic cell packs, and the photovoltaic cell packs are connected to the electric energy output end.

In some embodiments, the execution module 303 further comprises:

The compensation photovoltaic cell set is arranged for stabilizing the voltage output of the photovoltaic cell. The compensation photovoltaic cell pack is a photovoltaic cell pack capable of adjusting output voltage; the compensating photovoltaic cell slice group can be adjusted up and down. Thus, the first photovoltaic cell group is selected from the photovoltaic cell groups flexibly. Specifically, the compensating photovoltaic cell pack may be a circuit for setting a regulating voltage at an output end of a common photovoltaic cell pack, which is described in detail below. In some embodiments, the execution module 303 further comprises:

sequencing each photovoltaic cell group according to the output voltage;

In some embodiments, the execution module 303 further comprises:

More specifically, the Buck conversion circuit may be a Buck circuit.

The modules included in the embodiment may be implemented by a processor in a computer; but may also be implemented by logic circuits in a computer. The processor may be a general purpose processor, a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The general-purpose processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), or any other conventional processor.

The description of the apparatus embodiments above is similar to that of the method embodiments above, with similar advantageous effects as the method embodiments. For technical details not disclosed in the apparatus of this embodiment, please refer to the description of the method embodiment of the present invention for understanding.

Example III

The present embodiment provides a control apparatus including:

the first communication component is used for sending an instruction for obtaining the output voltage of each photovoltaic cell pack to the photovoltaic cell pack and forwarding the received output voltage of the photovoltaic cell pack to the control component; and the control part is used for conducting the first photovoltaic cell set and the electric energy output end of the photovoltaic cell, and sending a command for disconnecting the second photovoltaic cell set and the electric energy output end to the photovoltaic cell set.

The control unit of the present embodiment corresponds to the photovoltaic power output control apparatus 300 of the second embodiment. The first communication component serves to communicate between the control component and the photovoltaic cell stack. Some control instructions of the control component are also communicated to the photovoltaic cell pack through the first communication component. Specifically, the photovoltaic cell pack is provided with a second communication component, and the photovoltaic cell pack executes voltage acquisition and connection or disconnection of the photovoltaic cell pack and the electric energy output end of the photovoltaic cell according to the instruction received by the second communication component.

The description of the control device embodiments above is similar to that of the method embodiments above, with similar advantageous effects as the method embodiments. For technical details not disclosed in the control apparatus of the present embodiment, please refer to the description of the method embodiment of the present invention for understanding.

Example IV

The present embodiment provides a computing device 500, as shown in fig. 4, the computing device 500 comprising: memory 501, communication bus 502, and processor 503, wherein:

the memory 501 is configured to store a photovoltaic power output control method program;

the communication bus 502 for enabling a connection communication between the memory 501 and the processor 503;

The processor 503 is configured to execute a photovoltaic power output control method program to implement the steps of the method according to the first embodiment.

The type or structure of the memory 501 may refer to a storage medium hereinafter, and will not be described herein.

The processor 503 may be a general purpose processor, a Digital Signal Processor (DSP), a Field Programmable Gate Array (FPGA), or other programmable logic device, discrete gate or transistor logic device, discrete hardware components, or the like. The general-purpose processor may be a Central Processing Unit (CPU), a Microprocessor (MPU), or any other conventional processor.

In some embodiments, computing device 500 may further include: input devices 504, output devices 505, and external communication interfaces 506, which are interconnected by a bus system and/or other forms of connection mechanisms (not shown). In this embodiment, the input device may be a network connector, an analog-to-digital converter, etc., and the output device may be a display, a speaker, etc.

In some embodiments, input device 504 may also include, for example, a keyboard, a mouse, a microphone, and the like. The output device 505 may output various information to the outside, and may include, for example, a printer, a projector, a communication network, a remote output apparatus connected thereto, and the like, in addition to the above-described display, speaker. The external communication interface 506 may be wired, such as a standard serial port (RS 232), a General-purpose interface bus (GPIB) interface, an ethernet (ethernet) interface, a universal serial bus (Universal Serial Bus, USB) interface, or wireless, such as wireless network communication technology (WiFi), bluetooth (bluetooth), etc.

The description of the computing device 500 embodiment above is similar to that of the method embodiment described above, with similar benefits as the method embodiment. For technical details not disclosed in the computing device 500 of the present embodiment, please refer to the description of the method embodiment of the present invention.

Example five

The present embodiment provides a computer-readable storage medium having stored thereon an executable program which when executed by a processor implements the steps of the method according to embodiment one.

By way of example, a computer-readable storage medium may comprise any combination of one or more readable media. The readable medium may be a readable signal medium or a readable storage medium. A computer readable storage medium is a tangible device that can hold and store instructions for use by an instruction execution device. The readable storage medium may include, for example, but is not limited to, an electronic, magnetic, optical, electromagnetic, infrared, or semiconductor system, apparatus, or device, or a combination of any of the foregoing. More specific examples (a non-exhaustive list) of the readable storage medium would include the following: portable computer disks, hard disks, random access Memory (RAM, random Access Memory), read Only Memory (ROM), flash Memory (Flash Memory), portable compact disc Read Only Memory (CD-ROM, compact Disc Read-Only Memory), digital versatile discs (DVD, digital Versatile Disc), memory sticks, floppy disks, mechanical coding devices, punch cards or in-groove protrusion structures such as instructions stored thereon, and any suitable combination of the foregoing. Wherein:

The RAM includes: static random access memory (SRAM, static Random Access Memory), synchronous static random access memory (SSRAM, synchronous Static Random Access Memory), dynamic random access memory (DRAM, dynamic Random Access Memory), synchronous dynamic random access memory (SDRAM, synchronous Dynamic Random Access Memory), double data rate synchronous dynamic random access memory (ddr SDRAM, double Data Rate Synchronous Dynamic Random Access Memory), enhanced synchronous dynamic random access memory (ESDRAM, enhanced Synchronous Dynamic Random Access Memory), synchronous link dynamic random access memory (SLDRAM, syncLink Dynamic Random Access Memory), direct memory bus random access memory (DRRAM, direct Rambus Random Access Memory).

The ROM includes: a programmable read-Only Memory (PROM, programmable Read-Only Memory), an erasable programmable read-Only Memory (EPROM, erasable Programmable Read-Only Memory), an electrically erasable programmable read-Only Memory (EEPROM, electrically Erasable Programmable Read-Only Memory).

The computer-readable storage medium as used herein is not to be construed as a transitory signal itself, such as a radio wave or other freely propagating electromagnetic wave, an electromagnetic wave propagating through a waveguide or other transmission medium (e.g., an optical pulse through a fiber optic cable), or an electrical signal transmitted through an electrical wire.

The description of the computer-readable storage medium embodiments above is similar to that of the method embodiments described above, with similar benefits as the method embodiments. For technical details not disclosed in the computer-readable storage medium of the present embodiment, please refer to the description of the method embodiment of the present invention.

Example six

The present embodiment provides a photovoltaic inverter 600, as shown in fig. 5, including:

a control part 601, configured to obtain an output voltage of each photovoltaic cell group; comparing the accumulation of the output voltages of the photovoltaic cell slice groups with the preset output voltage of the photovoltaic cell; the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a plurality of photovoltaic cell groups with output voltages which are accumulated to be larger than or equal to a preset output voltage and are connected in series, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series;

A first communication unit 602, configured to send an instruction for obtaining an output voltage of each photovoltaic cell group to the photovoltaic cell group, and forward the received output voltage of the photovoltaic cell group to the control unit 601; the control part 601 conducts the first photovoltaic cell group with the electric energy output end of the photovoltaic cell, and sends a command for disconnecting the second photovoltaic cell group from the electric energy output end to the photovoltaic cell group;

and the inverter component 603 is used for converting the direct current output by the first photovoltaic battery pack connected to the electric energy output end into alternating current.

The output voltage of the photovoltaic cell is obtained, two measuring ends of the measuring device can be respectively connected to two ends of the photovoltaic cell group, the voltage and the current are respectively obtained, and then the voltage is obtained through calculation.

The preset output voltage of the photovoltaic cell can be a design output voltage, which is a voltage that can be output when the photovoltaic cell works normally. Generally, the preset output voltage of the photovoltaic cell is required to be stable, which is beneficial to the normal operation of facilities such as an inverter and a power transmission network of the photovoltaic cell.

The electrical energy output end of the photovoltaic cell can be the electrical energy output end of the whole photovoltaic cell matrix. In this embodiment, in order to make the voltage output of the photovoltaic cell relatively stable, a certain margin is provided on the number of photovoltaic cell groups. And the output voltage is larger than or equal to the preset output voltage without connecting all photovoltaic cell packs to the electric energy output end. Thus, the photovoltaic cell pack capable of meeting the preset output voltage can be obtained by accumulating the photovoltaic cell packs, and the photovoltaic cell packs are connected to the electric energy output end. In addition, since the operating state, performance, and the like of the photovoltaic cell stack are changed, it is necessary to repeat the above steps at regular or irregular times.

The control unit 601 of the present embodiment corresponds to the photovoltaic power output control apparatus 300 of the second embodiment. The first communication part 602 serves as a communication between the control part 601 and the photovoltaic cell stack. Some of the control instructions of the control component 601 are also communicated to the photovoltaic cell stack via the first communication component 602.

The inverter component 603 may be an H-bridge inverter module, which is configured to convert high-voltage dc power into 50HZ ac power.

The first communication section 602 and the inverter section 603 each operate according to an instruction of the control section 601.

In some embodiments, the control unit 601 includes a micro control unit (Microcontroller Unit; MCU), which is also called a single-chip microcomputer (Single Chip Microcomputer) or a single-chip microcomputer, which is to properly reduce the frequency and specification of a central processing unit (Central Process Unit; CPU), and integrate peripheral interfaces such as a memory (memory), a counter (Timer), a universal serial bus (Universal Serial Bus, USB), an analog-to-digital (a/D) conversion, a universal asynchronous Transmitter (Universal Asynchronous Receiver/Transmitter, UART), a programmable logic controller (Programmable Logic Controller, PLC), a direct memory access (Direct Memory Access, DMA), and even a liquid crystal display (Liquid Crystal Display, LCD) driving circuit on a single chip to form a chip-level computer for different applications to perform different combination control. Such as cell phones, personal computer (Personal Computer, PC) peripherals, remote controls, to automotive electronics, industrial stepper motors, robotic arm control, etc., can see the shadow of the MCU. Therefore, the MCU as the control section 601 has the advantages of strong function and low cost.

Example seven

This embodiment provides a photovoltaic cell, as shown in fig. 6, comprising:

a plurality of photovoltaic cell stacks 800 connected in series with each other; each of the photovoltaic cell stacks 800 includes a connection component 801, a bypass component 802, and a second communication component 803; the connection component 801 is located on the path of the input or output of the photovoltaic cell unit 800, and the bypass component 802 is connected with the input end and the output end of the photovoltaic cell unit 800 at the same time;

the electric energy output end is connected with the photovoltaic cell slice group 800;

the photovoltaic inverter 600 of embodiment six, wherein the photovoltaic inverter 600 is located between the photovoltaic cell module 800 and the electrical energy output terminal; the first communication section 602 and the second communication section 803 establish a communication connection; the photovoltaic inverter 600 obtains the output voltage of each photovoltaic cell set 800 through the communication connection, and turns on the first photovoltaic cell set and the electric energy output end and turns off the second photovoltaic cell set and the electric energy output end according to the condition of the output voltage; the first photovoltaic cell group is conducted with the electric energy output end and comprises: conducting the connection member; disconnecting the second photovoltaic cell group from the electrical energy output terminal includes: the connecting member is disconnected and the bypass member is conducted.

In this embodiment, the photovoltaic cell includes a plurality of photovoltaic cell stacks 800, for example, 1# and 2# … … n# photovoltaic cell stacks make up a photovoltaic cell assembly, and N photovoltaic cell assemblies make up a photovoltaic cell.

The connection part 801 may switch on or off the serial circuit of the first photovoltaic cell group and the second photovoltaic cell group according to the instruction of the control part 601;

the bypass component 802 may switch on or off the bypass circuit of the second photovoltaic cell group according to the instruction of the control component 601.

In the case of serial connection between the photovoltaic cell groups, the disconnection of the second photovoltaic cell group from the circuit of the photovoltaic cell may be the disconnection of the serial circuit of the first photovoltaic cell group and the second photovoltaic cell group. Meanwhile, a bypass circuit of the second photovoltaic cell slice group needs to be conducted so as to conduct a serial circuit of the whole photovoltaic cell.

If the photovoltaic cell groups are connected in parallel, the photovoltaic cell group of any parallel branch can be directly disconnected.

The photovoltaic inverter 600 may be referred to in the sixth embodiment, and will not be described in detail.

In some embodiments, the photovoltaic cell comprises a compensating photovoltaic cell stack 900, the compensating photovoltaic cell stack 900 being connected to the electrical energy output; the compensation photovoltaic cell group 900 is a photovoltaic cell group capable of adjusting output voltage, and belongs to the first photovoltaic cell group.

In order to make the voltage output of the photovoltaic cell more stable, the compensating photovoltaic cell set 900 is provided. The compensation photovoltaic cell group 900 is a photovoltaic cell group capable of adjusting output voltage; the compensating photovoltaic cell 900 can be either raised or lowered. Thus, the first photovoltaic cell group is selected from the photovoltaic cell groups flexibly. Specifically, the compensating photovoltaic cell pack may be a circuit for setting a regulating voltage at an output end of a common photovoltaic cell pack, which is described in detail below. The circuit for compensating the regulated voltage of the photovoltaic cell 900 is not shown in the drawings, and thus is the same as the structure of a general photovoltaic cell. Specifically, the compensation photovoltaic cell pack comprises a photovoltaic cell pack and the buck conversion circuit; the step-down conversion circuit comprises a step-down element and an energy storage element, wherein the step-down element steps down the output voltage of the photovoltaic battery pack and outputs the output voltage; the energy storage element can combine and output the electric energy stored by the energy storage element per se, and gradually increases the output value along with the increase of the conduction time of the buck conversion circuit so as to adjust the output voltage of the compensation photovoltaic battery pack through the duty ratio.

More specifically, the Buck conversion circuit may be a Buck circuit.

It should be noted that, the photovoltaic power output control method, the photovoltaic power output control apparatus 300, the control device, the computing device 500, the computer readable storage medium, the photovoltaic inverter 600 and the photovoltaic cell embodiments provided in the embodiments of the present application belong to the same concept; the features of the embodiments described in the present application may be combined arbitrarily without any conflict.

Embodiments of the present application may be a system, method, and/or computer program product. The computer program product may include a computer readable storage medium having computer readable program instructions embodied thereon for causing a processor to implement aspects of the present application. The computer program product may be written in any combination of one or more programming languages, including an object oriented programming language such as Java, C++ or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computer, partly on the user's device, as a stand-alone software package, partly on the user's computer and partly on a remote computer or entirely on the remote computer or server. In the case of a remote computer, the remote computer may be connected to the user's computer through any kind of network, including a local area network ((LAN)) or a wide area network ((WAN)), or may be connected to an external computer (e.g., connected through the internet using an internet service provider). In some embodiments, aspects of the present application are implemented by personalizing electronic circuitry, such as programmable logic circuitry, field Programmable Gate Arrays (FPGAs), or Programmable Logic Arrays (PLAs), with state information for computer readable program instructions, which can execute the computer readable program instructions.

The computer readable program instructions described herein may be downloaded from a computer readable storage medium to a respective computing/processing device or to an external computer or external storage device over a network, such as the internet, a local area network, a wide area network, and/or a wireless network. The network may include copper transmission cables, fiber optic transmissions, wireless transmissions, routers, firewalls, switches, gateway computers and/or edge servers. The network interface card or network interface in each computing/processing device receives computer readable program instructions from the network and forwards the computer readable program instructions for storage in a computer readable storage medium in the respective computing/processing device.

Various aspects of the present application are described herein with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems) and computer program products according to embodiments of the application. It will be understood that each block of the flowchart illustrations and/or block diagrams, and combinations of blocks in the flowchart illustrations and/or block diagrams, can be implemented by computer-readable program instructions.

These computer readable program instructions may be provided to a processor of a general purpose computer, special purpose computer, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions/acts specified in the flowchart and/or block diagram block or blocks. These computer readable program instructions may also be stored in a computer readable storage medium that can direct a computer, programmable data processing apparatus, and/or other devices to function in a particular manner, such that the computer readable medium having the instructions stored therein includes an article of manufacture including instructions which implement the function/act specified in the flowchart and/or block diagram block or blocks.

The computer readable program instructions may also be loaded onto a computer, other programmable data processing apparatus, or other devices to cause a series of operational steps to be performed on the computer, other programmable apparatus or other devices to produce a computer implemented process such that the instructions which execute on the computer, other programmable apparatus or other devices implement the functions/acts specified in the flowchart and/or block diagram block or blocks.

In the following description, the term "first/second/third" is merely to distinguish similar objects and does not represent a particular ordering for the objects, it being understood that the "first/second/third" may interchange a particular order or sequencing as allowed.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used herein, the singular forms "a", "an" and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms "comprises" and/or "comprising," when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term "and/or" includes any and all combinations of the associated listed items.

It should be appreciated that reference throughout this specification to "one embodiment" or "some embodiments" means that a particular feature, structure or characteristic described in connection with the embodiment is included in at least one embodiment of the present application. Thus, the appearances of the phrases "in one embodiment" or "in some embodiments" in various places throughout this specification are not necessarily all referring to the same embodiment. Furthermore, the particular features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. It should be understood that, in various embodiments of the present application, the sequence numbers of the foregoing processes do not mean the order of execution, and the order of execution of the processes should be determined by the functions and internal logic thereof, and should not constitute any limitation on the implementation process of the embodiments of the present application. The foregoing embodiment numbers of the present application are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.

In the several embodiments provided by the present application, it should be understood that the disclosed apparatus and method may be implemented in other ways. The above described device embodiments are only illustrative, e.g. the division of the modules is only one logical function division, and there may be other divisions in practice, such as: multiple modules or components may be combined, or may be integrated into another system, or some features may be omitted, or not performed. In addition, the various components shown or discussed may be coupled or directly coupled or communicatively coupled to each other via some interface, whether indirectly coupled or communicatively coupled to devices or modules, whether electrically, mechanically, or otherwise.

The modules described above as separate components may or may not be physically separate, and components shown as modules may or may not be physical modules; can be located in one place or distributed to a plurality of network modules; some or all of the modules may be selected according to actual needs to achieve the purpose of the solution of this embodiment.

In addition, each functional module in each embodiment of the present invention may be integrated in one processing module, or each functional module may be separately used as one module, or two or more functional modules may be integrated in one module; the integrated modules may be implemented in hardware or in hardware plus software functional modules.

Those of ordinary skill in the art will appreciate that: all or part of the steps of implementing the above method embodiments may be implemented by hardware associated with program instructions, and the foregoing program may be stored in a computer readable storage medium, which when executed, performs steps including the above method embodiments.

Alternatively, the above-described integrated modules of the present invention, if implemented in the form of software functional modules and sold or used as a stand-alone product, may also be stored in a computer-readable storage medium. Based on such understanding, the technical solutions of the embodiments of the present invention may be embodied in essence or a part contributing to the prior art in the form of a software product stored in a storage medium, including several instructions for causing an electronic device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the methods described in the embodiments of the present invention. Thus, embodiments of the invention are not limited to any specific combination of hardware and software.

The methods disclosed in the method embodiments provided by the application can be arbitrarily combined under the condition of no conflict to obtain a new method embodiment. The features disclosed in the several product embodiments provided by the application can be combined arbitrarily under the condition of no conflict to obtain new product embodiments.

It should be noted that, in this document, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising one … …" does not exclude the presence of other like elements in a process, method, article, or apparatus that comprises the element.

It should be understood that the above examples are illustrative and are not intended to encompass all possible implementations encompassed by the claims. Various modifications and changes may be made in the above embodiments without departing from the scope of the disclosure. Likewise, the individual features of the above embodiments can also be combined arbitrarily to form further embodiments of the application which may not be explicitly described. Therefore, the above examples merely represent several embodiments of the present application and do not limit the scope of protection of the patent of the present application.

Claims

1. A photovoltaic power output control method, characterized by comprising:

obtaining output voltage of each photovoltaic cell group;

the first photovoltaic cell slice group is conducted with the electric energy output end of the photovoltaic cell, and the second photovoltaic cell slice group is disconnected with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel;

before the first photovoltaic cell set is conducted with the electric energy output end of the photovoltaic cell and the second photovoltaic cell set is disconnected with the electric energy output end, the method further comprises:

2. The method of claim 1, wherein the step of switching on a first photovoltaic cell stack to an electrical power output of a photovoltaic cell and switching off a second photovoltaic cell stack to the electrical power output comprises:

sequencing each photovoltaic cell group according to the output voltage;

3. The method for controlling output of photovoltaic power according to claim 1 or 2, wherein said switching on the first photovoltaic cell group and the power output terminal of the photovoltaic cell, and switching off the second photovoltaic cell group and the power output terminal, comprises:

4. The photovoltaic power output control method according to claim 3, wherein the adjusting the output voltage of the compensation photovoltaic cell group includes:

5. A photovoltaic power output control device, comprising:

the execution module is used for conducting the first photovoltaic cell set with the electric energy output end of the photovoltaic cell and disconnecting the second photovoltaic cell set with the electric energy output end; the first photovoltaic cell group is a photovoltaic cell group which is formed by mutually connecting a plurality of output voltages in series and has a difference of a first preset value with the preset output voltage, and the second photovoltaic cell group is a photovoltaic cell group except the first photovoltaic cell group; the photovoltaic cell group comprises a preset number of photovoltaic cells which are connected in series; the photovoltaic cell comprises a plurality of photovoltaic cell pieces which are connected in series or in parallel;

The execution module is further configured to:

6. A control apparatus, characterized by comprising:

the communication component is used for sending an instruction for obtaining the output voltage of each photovoltaic cell pack to the photovoltaic cell pack and forwarding the received output voltage of the photovoltaic cell pack to the control component; transmitting an instruction which is transmitted by the control component and used for conducting the first photovoltaic cell group with the electric energy output end of the photovoltaic cell and disconnecting the second photovoltaic cell group from the electric energy output end to the photovoltaic cell group;

The control component is further configured to:

7. A computing device, the computing device comprising: memory, communication bus, and processor, wherein:

the processor is configured to execute a photovoltaic power output control method program to implement the steps of the method as claimed in any one of claims 1 to 4.

8. A computer readable storage medium, characterized in that it has stored thereon an executable program, which when executed by a processor, implements the steps of the method according to any of claims 1 to 4.

9. A photovoltaic inverter, comprising:

the inversion component is used for converting direct current output by the first photovoltaic battery pack connected to the electric energy output end into alternating current;

the control component is further configured to:

10. A photovoltaic cell, comprising:

the photovoltaic inverter of claim 9, located between the photovoltaic cell stack and the electrical energy output; the first communication component and the second communication component establish communication connection; the photovoltaic inverter obtains output voltages of the photovoltaic cell packs through the communication connection, and conducts the first photovoltaic cell pack with the electric energy output end and disconnects the second photovoltaic cell pack with the electric energy output end according to the condition of the output voltages; the first photovoltaic cell group is conducted with the electric energy output end and comprises: conducting the connection member; the second photovoltaic cell group is disconnected from the electric energy output end, and comprises: disconnecting the connecting member and connecting the bypass member;

the photovoltaic cell pack comprises a compensation photovoltaic cell pack, and the compensation photovoltaic cell pack is connected to the electric energy output end; the compensation photovoltaic cell group is a photovoltaic cell group capable of adjusting output voltage and belongs to the first photovoltaic cell group.

11. The photovoltaic cell of claim 10, wherein the compensating photovoltaic cell stack comprises a photovoltaic cell stack and a buck converter circuit; the step-down conversion circuit comprises a step-down element and an energy storage element, wherein the step-down element steps down the output voltage of the photovoltaic battery pack and outputs the output voltage; the energy storage element can combine and output the electric energy stored by the energy storage element per se, and gradually increases the output value along with the increase of the conduction time of the buck conversion circuit so as to adjust the output voltage of the compensation photovoltaic battery pack through the duty ratio.