CN117200690A - Access detection method of photovoltaic panel, photovoltaic inverter and readable storage medium - Google Patents
Access detection method of photovoltaic panel, photovoltaic inverter and readable storage medium Download PDFInfo
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- CN117200690A CN117200690A CN202310972805.1A CN202310972805A CN117200690A CN 117200690 A CN117200690 A CN 117200690A CN 202310972805 A CN202310972805 A CN 202310972805A CN 117200690 A CN117200690 A CN 117200690A
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Abstract
The application discloses an access detection method of a photovoltaic panel, a photovoltaic inverter and a storage medium. The method comprises the following steps: acquiring a first soft start state of a first voltage conversion circuit and a second soft start state of a second voltage conversion circuit; determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state; determining a current value of the standby voltage conversion circuit in a process that the target voltage conversion circuit executes soft start; and performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result. According to the access detection method of the photovoltaic panel, the access of the photovoltaic panel is detected by the misconnection according to the current value of the standby photovoltaic panel, and when misconnection occurs, the standby voltage conversion circuit and the target voltage conversion circuit are communicated, so that the current of the standby photovoltaic panel can be suddenly increased, and whether the misconnection occurs to the photovoltaic panel can be detected rapidly and accurately.
Description
Technical Field
The application relates to the technical field of electric power, in particular to an access detection method of a photovoltaic panel, a photovoltaic inverter and a computer readable storage medium.
Background
In a photovoltaic power supply system or a photovoltaic energy storage system, a photovoltaic panel needs to be connected into a direct current bus, and because the connection terminals of different photovoltaic panels are similar, the situation of wrong connection of the negative electrode is easy to occur. Such as: the negative terminal of the first photovoltaic panel is connected to the negative port to which the second photovoltaic panel belongs, and the negative terminal of the second photovoltaic panel is connected to the negative port to which the first photovoltaic panel belongs. When a photovoltaic panel misconnection occurs, the photovoltaic inverter or other components in the circuit can be greatly damaged. Therefore, how to quickly and accurately detect whether the photovoltaic panel is misconnected becomes a problem to be solved.
Disclosure of Invention
The application provides an access detection method of a photovoltaic panel, a photovoltaic inverter and a computer readable storage medium, which solve the problem that the photovoltaic inverter or other elements in a circuit are greatly damaged when the photovoltaic panel is in misconnection in the related technology.
In a first aspect, the present application provides an access detection method of a photovoltaic panel, which is applied to a photovoltaic inverter, where the photovoltaic inverter includes a first voltage conversion circuit and a second voltage conversion circuit, an input end of the first voltage conversion circuit is used to connect with the first photovoltaic panel, an output end of the first voltage conversion circuit is connected with a dc bus, an input end of the second voltage conversion circuit is used to connect with a second photovoltaic panel, and an output end of the second voltage conversion circuit is connected with the dc bus, and the access detection method of the photovoltaic panel includes: acquiring a first soft start state of the first voltage conversion circuit and a second soft start state of the second voltage conversion circuit; determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is a voltage conversion circuit for executing soft start; determining a current value of the standby voltage conversion circuit in a process of soft start of the target voltage conversion circuit; and performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result.
According to the access detection method of the photovoltaic panel, the current value of the standby voltage conversion circuit in the soft start process of the target voltage conversion circuit is determined, and the misconnection detection is carried out on the access of the photovoltaic panel according to the current value.
In a second aspect, the present application also provides a photovoltaic inverter, which includes a first voltage conversion circuit, a second voltage conversion circuit, and a control circuit; the input end of the first voltage conversion circuit is connected with the first photovoltaic panel, the output end of the first voltage conversion circuit is used for being connected with the direct current bus, the input end of the second voltage conversion circuit is used for being connected with the second photovoltaic panel, and the output end of the second voltage conversion circuit is connected with the direct current bus; the control circuit is used for executing the access detection method of the photovoltaic panel.
In a third aspect, the present application also provides a computer readable storage medium storing a computer program, which when executed by a processor causes the processor to implement a method for detecting access to a photovoltaic panel as described above.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings required for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present application, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
Fig. 1 is a schematic structural diagram of a photovoltaic power supply system according to an embodiment of the present application;
fig. 2 is a schematic structural diagram of a photovoltaic inverter according to an embodiment of the present application;
fig. 3 is a schematic structural diagram of another photovoltaic inverter according to an embodiment of the present application;
fig. 4 is a schematic circuit diagram of a photovoltaic inverter according to an embodiment of the present application;
fig. 5 is a schematic view of a negative electrode misconnection of a photovoltaic panel according to an embodiment of the present application;
fig. 6 is a schematic structural diagram of a control circuit according to an embodiment of the present application;
Fig. 7 is a schematic flow chart of an access detection method of a photovoltaic panel according to an embodiment of the present application;
FIG. 8 is a schematic flow chart of a sub-step of obtaining a soft start state provided by an embodiment of the present application;
FIG. 9 is a schematic flow chart of another sub-step of acquiring a soft start state provided by an embodiment of the present application;
FIG. 10 is a schematic flow chart of sub-steps of another method for detecting access to a photovoltaic panel provided by an embodiment of the present application;
FIG. 11 is a schematic flow chart of another substep of determining a current value provided by an embodiment of the present application;
fig. 12 is a schematic flow chart of sub-steps of another access detection method for a photovoltaic panel provided by an embodiment of the present application.
Detailed Description
The following description of the embodiments of the present application will be made clearly and fully with reference to the accompanying drawings, in which it is evident that the embodiments described are some, but not all embodiments of the application. All other embodiments, which can be made by those skilled in the art based on the embodiments of the application without making any inventive effort, are intended to be within the scope of the application.
The flow diagrams depicted in the figures are merely illustrative and not necessarily all of the elements and operations/steps are included or performed in the order described. For example, some operations/steps may be further divided, combined, or partially combined, so that the order of actual execution may be changed according to actual situations.
It is to be understood that the terminology used in the description of the application herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the application. As used in this specification and the appended claims, the singular forms "a," "an," and "the" are intended to include the plural forms as well, unless the context clearly indicates otherwise.
It should also be understood that the term "and/or" as used in the present specification and the appended claims refers to any and all possible combinations of one or more of the associated listed items, and includes such combinations.
The embodiment of the application provides an access detection method of a photovoltaic panel, a photovoltaic inverter, a photovoltaic power supply system and a computer readable storage medium. The method for detecting the access of the photovoltaic panel can be applied to a photovoltaic inverter, and can detect the access of the photovoltaic panel by determining the current value of the standby voltage conversion circuit in the process of soft start of the target voltage conversion circuit and detecting the access of the photovoltaic panel according to the current value.
The photovoltaic inverter may be a stand alone inverter, or may be disposed in an energy storage device, for example. The energy storage device can be a mobile energy storage device, a household energy storage device or the like.
Referring to fig. 1, fig. 1 is a schematic structural diagram of a photovoltaic power supply system 10 according to an embodiment of the application. As shown in fig. 1, the photovoltaic power supply system 10 may include a photovoltaic inverter 11, a first photovoltaic panel 13, and a second photovoltaic panel 14. The input side of the photovoltaic inverter 11 is connected to the first photovoltaic panel 13 and the second photovoltaic panel 14, and the output side of the photovoltaic inverter 11 is connected to the load 12. The load 12 may be a consumer or a grid.
Referring to fig. 2, fig. 2 is a schematic structural diagram of a photovoltaic inverter 11 according to an embodiment of the application. As shown in fig. 2, the photovoltaic inverter 11 includes a first voltage conversion circuit 110, a second voltage conversion circuit 111, a control circuit 112, an LLC resonant circuit 113, and an inverter circuit 114. The input end of the first voltage conversion circuit 110 is used for being connected with the first photovoltaic panel 13, the output end of the first voltage conversion circuit 110 is connected with a direct current Bus (such as bus+ and Bus-) in fig. 2), the input end of the second voltage conversion circuit 111 is used for being connected with the second photovoltaic panel 14, and the output end of the second voltage conversion circuit 111 is connected with the direct current Bus. The control circuit 112 is connected to the first voltage conversion circuit 110 and the second voltage conversion circuit 111, respectively, and is configured to obtain a first soft start state of the first voltage conversion circuit 110 and a second soft start state of the second voltage conversion circuit 111. An input terminal of the LLC resonant circuit 113 is connected to the dc bus, an output terminal of the LLC resonant circuit 113 is connected to an input terminal of the inverter circuit 114, and an output terminal of the inverter circuit 114 is connected to the load 12.
Referring to fig. 3, fig. 3 is a schematic structural diagram of another photovoltaic inverter 11 according to an embodiment of the application. As shown in fig. 3, the photovoltaic inverter 11 may include a first voltage conversion circuit 110, a second voltage conversion circuit 111, a control circuit 112, an LLC resonant circuit 113, an inverter circuit 114, and a current sampling circuit 115.
The current sampling circuit 115 is connected to the negative input terminal of the first voltage conversion circuit 110 and the negative input terminal of the second voltage conversion circuit 111, and the current sampling circuit 115 is configured to sample a current value flowing through the negative input terminal.
For example, the current sampling circuit 115 may collect a current value of the first voltage conversion circuit 110 during the soft start of the second voltage conversion circuit 111, or collect a current value of the second voltage conversion circuit 111 during the soft start of the first voltage conversion circuit 110, and then perform a misconnection detection on the access of the photovoltaic panel according to the current value by the control circuit 112, so as to obtain a misconnection detection result.
Referring to fig. 4, fig. 4 is a schematic circuit diagram of a photovoltaic inverter 11 according to an embodiment of the application. As shown in fig. 4, the photovoltaic inverter 11 may include a first voltage conversion circuit 110, a second voltage conversion circuit 111, a control circuit 112 (not shown in the figure), an LLC resonant circuit 113, an inverter circuit 114, and a current sampling circuit 115. The first voltage conversion circuit 110 may include a first switching tube Q1, and the first switching tube Q1 is used to turn on or off a connection between a positive input terminal of the first voltage conversion circuit 110 and a negative input terminal of the first voltage conversion circuit 110.
In the embodiment of the present application, the soft-start state of the first voltage conversion circuit 110 may be determined by the duty ratio of the first switching transistor Q1. After the first voltage conversion circuit 110 enters soft start, if the soft start current value does not reach the target current value, the duty ratio of the first switching transistor Q1 needs to be controlled to increase until the soft start current value reaches the target value, so that it can be determined whether the first voltage conversion circuit 110 enters the soft start state by the duty ratio of the first switching transistor Q1.
As shown in fig. 4, the first voltage conversion circuit 110 may further include a second switching tube Q2, where the second switching tube Q2 is used to turn on or off a connection between the positive input terminal of the first voltage conversion circuit 110 and the dc bus. For example, when the first voltage conversion circuit 110 is determined as the standby voltage conversion circuit, a turn-off signal may be transmitted to the second switching tube Q2 such that the second switching tube Q2 disconnects the connection between the positive input terminal of the first voltage conversion circuit 110 and the direct current bus according to the turn-off signal.
The current sampling circuit 115 may include current sampling resistors, such as resistors R1 and R2 in fig. 4.
It is understood that the second voltage conversion circuit 111 has the same structure and function as the first voltage conversion circuit 110, and will not be described herein.
Illustratively, the switching transistors in the first voltage conversion circuit 110, the second voltage conversion circuit 111, the LLC resonant circuit 113, and the inverter circuit 114 may include, but are not limited to, a triode, a field-effect transistor (MOS) or an insulated gate bipolar transistor (Insulated Gate Bipolar Transistor, IGBT), and the like. The connection relationship among the switching transistors in the first voltage conversion circuit 110, the second voltage conversion circuit 111, the LLC resonant circuit 113, and the inverter circuit 114 is shown in fig. 4, and will not be described herein.
In the embodiment of the application, the misconnection mainly refers to the misconnection of the cathodes of the photovoltaic panels. The misconnection detection may include detecting whether the negative terminal of the first photovoltaic panel 13 is connected to the negative port of the second voltage conversion circuit 111, or detecting whether the negative terminal of the second photovoltaic panel 14 is connected to the negative port of the first voltage conversion circuit 110.
Referring to fig. 5, fig. 5 is a schematic diagram of a staggered connection of cathodes of a photovoltaic panel according to an embodiment of the application. Under normal conditions, the positive terminal PV1+ of the first photovoltaic panel 13 is connected to point C (positive input terminal of the first voltage conversion circuit 110), the negative terminal PV 1-of the first photovoltaic panel 13 is connected to point G (negative input terminal of the first voltage conversion circuit 110), points E and F in the first voltage conversion circuit 110 are connected, and points a and B are common ground. As shown in fig. 5, when the first photovoltaic panel 13 is connected with the negative electrode in a staggered manner, the positive electrode terminal PV1+ of the first photovoltaic panel 13 is connected to the point C (positive electrode input end of the first voltage conversion circuit 110), and the negative electrode terminal PV 1-of the first photovoltaic panel 13 is connected to the point D (negative electrode input end of the second voltage conversion circuit 111), so that the PV1+, the point C, the point E, the point a, the point B, the point D and the PV 1-form a loop, and when the first voltage conversion circuit 110 enters into a soft state After the start, if the target value of the soft start current is i_ref1, the negative electrode of the first photovoltaic panel 13 is connected in a staggered manner, so that the current value i_pv1 obtained by sampling the current sampling resistor R1 corresponding to the first photovoltaic panel 13 is always 0. If the current value I_pv1 does not reach the target value I_ref1 all the time, the switching tube Q in the first voltage conversion circuit 110 is caused 1 The duty cycle of (2) is continuously increased until reaching the maximum value, and the switching tube Q 1 Excessive duty cycle of (a) can cause a significant current surge in the negative pole loop of the second photovoltaic panel 111. And the current surge generated by the negative electrode loop of the second voltage conversion circuit 111 easily burns out the photovoltaic inverter.
In order to avoid the problem that the photovoltaic inverter is easy to burn due to the fact that the negative electrode of the photovoltaic panel is in misconnection during soft start of the voltage conversion circuit, the embodiment of the application determines the current value of the standby voltage conversion circuit in the process that the target voltage conversion circuit executes soft start, and carries out misconnection detection on the access of the photovoltaic panel according to the current value. And when the occurrence of the wrong connection of the negative electrode of the photovoltaic panel is confirmed, the target voltage conversion circuit is controlled to stand by in time, so that huge current impact can be avoided, and the wrong connection of the negative electrode is effectively prevented from burning the photovoltaic inverter.
Referring to fig. 6, fig. 6 is a schematic diagram of a control circuit 112 according to an embodiment of the application, and as shown in fig. 6, the control circuit 112 includes at least a processor 1120 and a memory 1121. The processor 1120 and the memory 1121 may be connected by a communication bus, which may be any suitable bus such as an integrated circuit (Inter-integrated Circuit, I2C) bus.
The memory 1121 may store an operating system and computer programs, among other things. The computer program includes program instructions that, when executed, cause the processor 1120 to perform the method for detecting access to a photovoltaic panel described in any of the embodiments.
Wherein the processor 1120 is configured to provide computing and control capabilities, supporting the operation of the overall control circuit 112.
The processor 1120 may be a central processing unit (Central Processing Unit, CPU), which may also be a general purpose processor, a digital signal processor (Digital Signal Processor, DSP), an application specific integrated circuit (application specific integrated circuit, ASIC), a Field-programmable gate array (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 microprocessor, or it may be any conventional processor or the like.
In one embodiment, the processor 1120 is configured to execute a computer program stored in the memory 1121 to implement the steps of:
acquiring a first soft start state of a first voltage conversion circuit and a second soft start state of a second voltage conversion circuit; determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is a voltage conversion circuit for executing soft start; determining a current value of the standby voltage conversion circuit in a process that the target voltage conversion circuit executes soft start; and performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result.
In one embodiment, the first voltage conversion circuit includes a first switching tube for turning on or off a connection between a positive input terminal of the first voltage conversion circuit and a negative input terminal of the first voltage conversion circuit; the processor 1120, when implementing the first soft start state of the first voltage conversion circuit, is configured to implement:
acquiring a first bus voltage of a bus capacitor when a photovoltaic inverter is started; determining the duty ratio of a first switching tube at the current moment and the second bus voltage of a bus capacitor; and determining a first soft start state according to the first bus voltage, the second bus voltage and the duty cycle.
In one embodiment, processor 1120, when implementing determining the first soft start state based on the first bus voltage, the second bus voltage, and the duty cycle, is to implement:
subtracting the second bus voltage from the first bus voltage to obtain a bus voltage difference;
and if the bus voltage difference is larger than the first preset voltage and the duty ratio is larger than the preset duty ratio, determining that the first soft start state is the soft start state.
In one embodiment, the processor 1120, when implementing the first soft start state of the acquisition first voltage conversion circuit, is configured to implement:
acquiring a soft start flag bit corresponding to a first voltage conversion circuit; and determining a first soft start state according to the soft start flag bit.
In one embodiment, the processor 1120, when implementing the determination of the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, is configured to implement:
if the first soft start state is the soft start state, and the second soft start state is the soft start state, determining the first voltage conversion circuit as a target voltage conversion circuit and determining the second voltage conversion circuit as a standby voltage conversion circuit; or if the first soft start state is not in the soft start state and the second soft start state is in the soft start state, determining the first voltage conversion circuit as a standby voltage conversion circuit and determining the second voltage conversion circuit as a target voltage conversion circuit; or if the first soft start state is the soft start state and the second soft start state is the soft start state, determining one of the first voltage conversion circuit and the second voltage conversion circuit as a target voltage conversion circuit and determining the other voltage conversion circuit as a standby voltage conversion circuit.
In one embodiment, the first voltage conversion circuit further comprises a second switching tube, and the second switching tube is used for conducting or disconnecting the connection between the positive electrode input end of the first voltage conversion circuit and the direct current bus; the processor 1120, after implementing the determination of the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit, is further configured to implement:
if the first voltage conversion circuit is a standby voltage conversion circuit, a turn-off signal is sent to the second switching tube, and the turn-off signal is used for indicating the second switching tube to disconnect the connection between the positive input end of the first voltage conversion circuit and the direct current bus.
In one embodiment, the processor 1120, when implementing the determination of the current value of the standby voltage conversion circuit during the soft start performed by the target voltage conversion circuit, is configured to implement:
acquiring the soft start time length of the target voltage conversion circuit, and dividing the soft start time length into a plurality of sub-time lengths; obtaining the maximum sub-current value of the standby voltage conversion circuit in each sub-time length; the maximum sub-current value in the sub-time period is taken as the current value.
In one embodiment, the processor 1120 is further configured to, after implementing the misconnection detection on the access of the photovoltaic panel according to the current value, obtain a misconnection detection result, implement:
If the occurrence of the misconnection is confirmed based on the misconnection detection result, the control target voltage conversion circuit stands by.
Some embodiments of the present application are described in detail below with reference to the accompanying drawings. The following embodiments and features of the embodiments may be combined with each other without conflict. Referring to fig. 7, fig. 7 is a schematic flowchart of a method for detecting access to a photovoltaic panel according to an embodiment of the present application. As shown in fig. 7, the method for detecting access of the photovoltaic panel includes steps S101 to S104.
Step S101, a first soft start state of the first voltage conversion circuit and a second soft start state of the second voltage conversion circuit are obtained.
In some embodiments, upon access detection of the photovoltaic panel, the photovoltaic inverter may acquire a first soft start state of the first voltage conversion circuit and a second soft start state of the second voltage conversion circuit.
The soft start refers to a pre-charging process of the photovoltaic panel for the bus capacitor on the dc bus through the voltage conversion circuit when the photovoltaic inverter is started. For example, the soft start state may include a soft start state entered and a soft start state not entered. In the embodiment of the application, the soft start state of the voltage conversion circuit can be comprehensively determined through the first bus voltage during the starting of the photovoltaic inverter, the second bus voltage during the starting process and the duty ratio of the first switch tube in the voltage conversion circuit, and the soft start state of the voltage conversion circuit can be judged according to the soft start zone bit corresponding to the voltage conversion circuit.
In an exemplary embodiment, when the first soft start state of the first voltage conversion circuit is obtained, the first bus voltage at the start of the photovoltaic inverter, the second bus voltage during the start process, and the duty ratio of the first switching tube in the first voltage conversion circuit may be obtained, and the first soft start state of the first voltage conversion circuit may be determined according to the first bus voltage, the second bus voltage, and the duty ratio of the first switching tube. Of course, the first soft start state of the first voltage conversion circuit may also be determined according to the soft start flag bit corresponding to the first voltage conversion circuit.
In an exemplary embodiment, when the second soft start state of the second voltage conversion circuit is obtained, the first bus voltage at the start of the photovoltaic inverter and the second bus voltage during the start process and the duty ratio of the first switching tube in the second voltage conversion circuit may be obtained, and the second soft start state of the second voltage conversion circuit may be determined according to the first bus voltage, the second bus voltage and the duty ratio of the first switching tube. Of course, the first soft start state of the first voltage conversion circuit may also be determined according to the soft start flag bit corresponding to the first voltage conversion circuit.
In the above embodiment, by acquiring the first soft start state of the first voltage conversion circuit and the second soft start state of the second voltage conversion circuit at the start-up of the photovoltaic inverter, the target voltage conversion circuit and the standby voltage conversion circuit can be subsequently determined from the first voltage conversion circuit and the second voltage conversion circuit according to the soft start state.
Step S102, determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is the voltage conversion circuit for executing soft start.
For example, after the first soft start state of the first voltage conversion circuit and the second soft start state of the second voltage conversion circuit are acquired, the target voltage conversion circuit and the standby voltage conversion circuit may be determined from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state. The target voltage conversion circuit is a voltage conversion circuit for performing soft start.
In the embodiment of the present application, in order to conveniently and accurately detect whether the photovoltaic panel is connected with the anode in a wrong way, different control mechanisms may be set for the voltage conversion circuit based on the soft start state of the voltage conversion circuit, and the two cases that the voltage conversion circuit has been in the soft start state and has not been in the soft start state will be described below.
In some embodiments, determining the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state may include: if the first soft start state is the soft start state, and the second soft start state is the soft start state, the first voltage conversion circuit is determined as a target voltage conversion circuit, and the second voltage conversion circuit is determined as a standby voltage conversion circuit.
It should be noted that, under normal conditions, the current of the voltage conversion circuit that does not enter the soft start state is zero, and when the negative electrode of the photovoltaic panel is misconnected, the current of the voltage conversion circuit that does not enter the soft start state may increase suddenly. Therefore, in order to facilitate detection of whether or not a negative electrode misconnection occurs in the photovoltaic panel by a current, the voltage conversion circuit that does not enter the soft start state may be preferentially determined as the standby voltage conversion circuit.
For example, upon confirming that the first soft start state is the entered soft start state and the second soft start state is the non-entered soft start state, the photovoltaic inverter may determine the first voltage conversion circuit as the target voltage conversion circuit and the second voltage conversion circuit as the standby voltage conversion circuit.
In the embodiment of the present application, after the second voltage conversion circuit is determined as the standby voltage conversion circuit, the second switching tube (e.g., Q4 in fig. 4 or fig. 5) in the second voltage conversion circuit may be controlled to be turned off, so as to disconnect the connection between the positive input terminal of the second voltage conversion circuit and the dc bus. It can be understood that by controlling the second switching tube in the second voltage conversion circuit to be turned off, if the photovoltaic panel is not connected in a misconnection, the current value of the second voltage conversion circuit in the process of performing soft start by the first voltage conversion circuit should be 0. If the photovoltaic panel is in the wrong connection with the negative electrode, the current value of the second voltage conversion circuit in the soft start process of the first voltage conversion circuit can be suddenly increased, so that whether the photovoltaic panel is in the wrong connection with the negative electrode can be conveniently and accurately detected.
In other embodiments, determining the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state may further include: if the first soft start state is not the soft start state, and the second soft start state is the soft start state, the first voltage conversion circuit is determined to be a standby voltage conversion circuit, and the second voltage conversion circuit is determined to be a target voltage conversion circuit.
For example, upon confirming that the first soft start state is not entered into the soft start state and the second soft start state is entered into the soft start state, the photovoltaic inverter may determine the first voltage conversion circuit as a standby voltage conversion circuit and the second voltage conversion circuit as a target voltage conversion circuit.
In some embodiments, determining the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state may include: if the first soft start state is the soft start state and the second soft start state is the soft start state, one of the first voltage conversion circuit and the second voltage conversion circuit is determined as a target voltage conversion circuit, and the other voltage conversion circuit is determined as a standby voltage conversion circuit.
In the embodiment of the present application, when both the first voltage conversion circuit and the second voltage conversion circuit enter the soft start state, in order to facilitate detecting whether the negative electrode of the photovoltaic panel is connected in a misconnection by the current, one of the voltage conversion circuits may be determined as the standby voltage conversion circuit.
For example, when the first soft start state is the entered soft start state and the second soft start state is the entered soft start state, the photovoltaic inverter may determine one of the first voltage conversion circuit and the second voltage conversion circuit as the target voltage conversion circuit and the other voltage conversion circuit as the standby voltage conversion circuit. For example, the first voltage conversion circuit may be determined as a target voltage conversion circuit, and the second voltage conversion circuit may be determined as a standby voltage conversion circuit. For another example, the first voltage conversion circuit may be determined as a standby voltage conversion circuit, and the second voltage conversion circuit may be determined as a target voltage conversion circuit.
In the above embodiment, by determining the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit based on the soft start state of the voltage conversion circuit, the following can perform the misconnection detection on the access of the photovoltaic panel according to the current value of the standby voltage conversion circuit in the process of performing soft start on the target voltage conversion circuit.
Step S103, determining a current value of the standby voltage conversion circuit during the soft start of the target voltage conversion circuit.
For example, after the target voltage conversion circuit and the standby voltage conversion circuit are determined from the first voltage conversion circuit and the second voltage conversion circuit, a current value of the standby voltage conversion circuit during the execution of soft start by the target voltage conversion circuit may be determined. For example, the current value of the standby voltage conversion circuit in the process of performing soft start by the target voltage conversion circuit can be obtained by sampling the current value flowing through the negative input terminal of the standby voltage conversion circuit by the current sampling circuit corresponding to the standby voltage conversion circuit.
Wherein the maximum current value flowing through the negative input terminal of the standby voltage conversion circuit can be determined as the current value of the standby voltage conversion circuit in the process of performing soft start by the target voltage conversion circuit. When the negative electrode of the photovoltaic panel is in misconnection, the current value of the standby voltage conversion circuit is greatly changed, so that the current peak value of the standby voltage conversion circuit can be obtained by obtaining the maximum current value of the standby voltage conversion circuit in the process that the target voltage conversion circuit executes soft start, and the accuracy of detecting whether the photovoltaic panel is in misconnection can be improved.
In the above embodiment, by determining the current value of the standby voltage conversion circuit during the soft start of the target voltage conversion circuit, whether the negative electrode misconnection of the photovoltaic panel occurs can be detected subsequently according to the current value.
And step S104, performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result.
After determining the current value of the standby voltage conversion circuit in the process of soft start of the target voltage conversion circuit, the cross connection detection can be carried out on the access of the photovoltaic panel according to the current value, and a cross connection detection result is obtained. The misconnection detection result may include that the first photovoltaic panel and the second photovoltaic panel are connected normally, or that the first photovoltaic panel and the second photovoltaic panel are connected with each other with a negative electrode in a misconnection manner.
For example, when the current value of the standby voltage conversion circuit during the soft start performed by the target voltage conversion circuit is greater than the current threshold value, it may be confirmed that the first photovoltaic panel and the second photovoltaic panel are misconnected with each other with the negative electrode. The preset current threshold may be set according to actual situations, and specific values are not limited herein.
Under normal conditions, the current of the standby voltage conversion circuit which does not enter the soft start state is zero, and when the negative electrode of the photovoltaic panel is in misconnection, the standby voltage conversion circuit and the target voltage conversion circuit are communicated, the current of the negative electrode input end of the standby voltage conversion circuit can be changed due to the soft start of the target voltage conversion circuit, and the current value fluctuation is larger along with the current surge of the soft start result of the target voltage conversion circuit. Therefore, whether the negative electrode of the photovoltaic panel is in the wrong connection or not can be detected rapidly and accurately by carrying out the wrong connection detection according to the current value of the standby voltage conversion circuit.
In the embodiment of the present application, for convenience of explanation, a first voltage conversion circuit will be taken as an example, and how to obtain a first soft start state of the first voltage conversion circuit will be explained.
Referring to fig. 8, fig. 8 is a schematic flowchart of a sub-step of obtaining a soft start state according to an embodiment of the present application, and obtaining a first soft start state of a first voltage conversion circuit in step S101 may include the following steps S201 to S203.
Step 201, a first bus voltage of a bus capacitor at the start of a photovoltaic inverter is obtained.
It should be noted that, when the voltage conversion circuit enters the soft start state, the voltage conversion circuit will change the bus capacitance (e.g. C in FIG. 4 or FIG. 5 bus ) Precharging is performed by a first switching tube (e.g. Q in FIG. 4 or 5 1 ) The duty cycle of the first switching tube, and thus the first soft start state of the first voltage converting circuit can be detected by the bus voltage and the duty cycle of the first switching tube.
For example, at the start-up of the photovoltaic inverter, the first bus voltage of the bus capacitor at the start-up of the photovoltaic inverter may be collected by the voltage sampling circuit. Wherein the first bus voltage may be denoted as U bus1 。
Step S202, determining the duty ratio of the first switch tube at the current moment and the second bus voltage of the bus capacitor.
Illustratively, after the photovoltaic inverter is started, the second bus voltage of the bus capacitor can be acquired in real time through the voltage sampling circuit, and the second bus voltage is acquired through the first switchThe control signal of the tube detects the duty cycle of the first switching tube in real time. Wherein the second bus voltage may be represented as U bus2 。
It should be noted that the control signal may include a duty cycle of the first switching tube. In the embodiment of the application, the duty ratio of the first switching tube can be obtained by performing deviation adjustment according to the target current value and the actual soft start current value of the first voltage conversion circuit based on the current control loop. By way of example, the current control loop may include an adder, a deviator, a limiter, and the like.
The bias device may be a PI (Proportional-Integral) regulator or a PID (Proportional-Integral-Differential coefficient) regulator, which is not limited herein.
Step S203, determining a first soft start state according to the first bus voltage, the second bus voltage and the duty cycle.
For example, after the first bus voltage of the bus capacitor at the start of the photovoltaic inverter is obtained and the duty ratio of the first switching tube and the second bus voltage of the bus capacitor at the current moment are determined, the first soft start state may be determined according to the first bus voltage, the second bus voltage and the duty ratio.
In some embodiments, determining the first soft start state based on the first bus voltage, the second bus voltage, and the duty cycle may include: subtracting the second bus voltage from the first bus voltage to obtain a bus voltage difference; and if the bus voltage difference is larger than the first preset voltage and the duty ratio is larger than the preset duty ratio, determining that the first soft start state is the soft start state.
The second bus voltage U is exemplified by bus2 And a first bus voltage U bus1 And subtracting to obtain a bus voltage difference delta U. When the bus voltage difference delta U is detected to be larger than the first preset voltage and the duty ratio is detected to be larger than the preset duty ratio, the first soft start state can be confirmed to be the soft start state.
The first preset voltage and the preset duty ratio may be set according to actual conditions, and specific values are not limited herein. In the embodiment of the present application, the first preset voltage and the preset duty cycle may be set according to the target voltage difference and the duty cycle of the preset test voltage conversion circuit when the test voltage conversion circuit enters the soft start state, and the specific process is not described herein.
In some embodiments, the preset duty cycle may be 0. For example, when it is detected that the bus voltage difference Δu is greater than the first preset voltage and the duty cycle is greater than 0, it may be confirmed that the first soft start state is the entered soft start state.
When the bus voltage is gradually increased and the first switching tube is turned on, the first voltage conversion circuit is described as entering a soft start state.
According to the embodiment, the first soft start state is determined according to the first bus voltage of the bus capacitor when the photovoltaic inverter is started, the second bus voltage of the bus capacitor at the current moment and the duty ratio of the first switching tube, so that the first soft start state can be comprehensively determined according to the bus voltage and the duty ratio which are obviously changed when the first voltage conversion circuit is in normal soft start, and the accuracy of determining the first soft start state can be effectively improved.
It can be appreciated that in the embodiment of the present application, the process of determining the second soft start state of the second voltage conversion circuit is the same as the process of determining the first soft start state of the first voltage conversion circuit, which is not described herein.
Referring to fig. 9, fig. 9 is a schematic flowchart of another sub-step of obtaining a soft start state according to an embodiment of the present application, where step S101 obtains a first soft start state of a first voltage conversion circuit, and may further include the following step S301 and step S302.
Step S301, a soft start flag bit corresponding to the first voltage conversion circuit is acquired.
It should be noted that, in the embodiment of the present application, after the photovoltaic inverter is powered on, the soft start states of the first voltage conversion circuit and the second voltage conversion circuit may be detected in real time, and a preset soft start flag bit may be set according to the soft start states. For example, two soft start flags flag1 and flag2 may be set, with initial values of 0. When the first voltage conversion circuit enters a soft start state, the soft start flag bit 1 is set to 1, and when the second voltage conversion circuit enters the soft start state, the soft start flag bit 2 is set to 1.
For example, the photovoltaic inverter may obtain a soft start flag bit corresponding to the first voltage conversion circuit. For example, the soft start flag bit flag1 corresponding to the first voltage conversion circuit may be read from the memory.
Step S302, determining a first soft start state according to the soft start flag bit.
For example, after the soft start flag bit corresponding to the first voltage conversion circuit is obtained, the first soft start state may be determined according to the soft start flag bit. For example, if the soft start flag bit flag1 is 1, it may be determined that the first soft start state is the soft start state. For another example, if the soft start flag bit flag1 is 0, it may be determined that the first soft start state is not entered.
According to the embodiment, the first soft start state is determined according to the soft start flag bit by acquiring the soft start flag bit corresponding to the first voltage conversion circuit, logic is simple, and the efficiency of determining the first soft start state can be effectively improved.
It can be appreciated that in the embodiment of the present application, the process of determining the second soft start state of the second voltage conversion circuit is the same as the process of determining the first soft start state of the first voltage conversion circuit, which is not described herein.
Referring to fig. 10, fig. 10 is a schematic flowchart of the substeps of another method for detecting access to a photovoltaic panel according to an embodiment of the present application, which may include the following steps S401 to S403.
Step S401, acquiring a first soft start state of the first voltage conversion circuit and a second soft start state of the second voltage conversion circuit.
Step S402, determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is the voltage conversion circuit for executing soft start.
It is understood that the steps S401 to S402 are the same as the steps S101 to S102 described above, and are not described herein.
In step S403, if the first voltage conversion circuit is a standby voltage conversion circuit, a turn-off signal is sent to the second switching tube, where the turn-off signal is used to instruct the second switching tube to disconnect the connection between the positive input terminal of the first voltage conversion circuit and the dc bus.
For example, after the first voltage conversion circuit is determined as the standby voltage conversion circuit, a turn-off signal may be sent to a second switching tube (e.g., the switching tube Q2 in fig. 4 or 5) in the first voltage conversion circuit, so that the second switching tube disconnects the connection between the positive input terminal of the first voltage conversion circuit and the dc bus according to the turn-off signal.
It can be understood that by controlling the second switching tube in the first voltage conversion circuit to be turned off, if the photovoltaic panel is not connected in a misconnection manner, the current value of the first voltage conversion circuit in the process that the second voltage conversion circuit executes soft start should be 0; if the photovoltaic panel is in misconnection, the current value of the first voltage conversion circuit in the soft start process executed by the second voltage conversion circuit can be changed, so that whether the photovoltaic panel is in misconnection can be conveniently and accurately detected.
In the embodiment of the application, if the second voltage conversion circuit is a standby voltage conversion circuit, a turn-off signal is sent to a second switching tube in the second voltage conversion circuit, so that the second switching tube in the second voltage conversion circuit disconnects the connection between the positive input end of the second voltage conversion circuit and the direct current bus according to the turn-off signal.
According to the embodiment, the connection between the positive electrode input end of the standby voltage conversion circuit and the direct current bus is disconnected, and then when the sudden increase of the current value of the standby voltage conversion circuit in the soft start process of the target voltage conversion circuit is detected, the occurrence of the negative electrode misconnection of the photovoltaic panel can be conveniently and accurately detected.
Referring to fig. 11, fig. 11 is a schematic flowchart of another substep of determining a current value provided in an embodiment of the present application, and determining a current value of a standby voltage conversion circuit during a soft start process performed by a target voltage conversion circuit in step S103 may include the following steps S501 to S503.
Step S501, obtaining a soft start duration of the target voltage conversion circuit, and dividing the soft start duration into a plurality of sub-durations.
In addition, during the soft start of the target voltage conversion circuit, the current value of the standby voltage conversion circuit does not rise linearly but continuously fluctuates, that is, the maximum current value of the standby voltage conversion circuit does not necessarily occur at the end of the soft start of the target voltage conversion circuit, and therefore, in order to improve the accuracy of obtaining the maximum current value of the standby voltage conversion circuit, it is necessary to determine the current value of the standby voltage conversion circuit during the soft start of the target voltage conversion circuit by using the current comparison method.
For example, the soft-start duration of the target voltage conversion circuit may be acquired, and the soft-start duration may be divided into a plurality of sub-durations. Wherein the soft start duration may be denoted as T 1 。
In some embodiments, the soft start duration may be divided into a plurality of sub-durations according to a control period of the photovoltaic inverter control target voltage conversion circuit. Wherein the control period may be denoted as T 0 . The number N of the sub-time periods is T 1 /T 0 Each sub-duration is T 0 . Of course, the soft start duration may be divided into a plurality of sub-durations according to other manners, which are not limited herein.
Step S502, obtaining the maximum sub-current value of the standby voltage conversion circuit in each sub-time period.
For example, after dividing the soft start period into a plurality of sub-periods, a maximum sub-current value of the standby voltage conversion circuit in each sub-period may be obtained. For example, the maximum sub-current value of the standby voltage conversion circuit within each sub-time period may be acquired by the current sampling current. Wherein the maximum sub-current value within each sub-time period is i_max1, i_max2, respectively.
Step S503, the maximum sub-current value in the sub-time period is taken as the current value.
For example, after the maximum sub-current value of the standby voltage conversion circuit in each sub-period is acquired, the maximum sub-current value in the sub-period may be taken as the current value.
According to the embodiment, the soft start time length is divided into the plurality of sub time lengths, the maximum sub current value of the standby voltage conversion circuit in each sub time length is obtained, the maximum sub current value in the sub time length is used as the current value, the current value of the standby voltage conversion circuit at the end of soft start of the target voltage conversion circuit is prevented from being used as the maximum current value, and the accuracy of the maximum current value of the standby voltage conversion circuit can be improved.
Referring to fig. 12, fig. 12 is a schematic flowchart of the substeps of another method for detecting access to a photovoltaic panel according to an embodiment of the present application, which may include the following steps S601 to S605.
Step S601, acquiring a first soft start state of the first voltage conversion circuit and a second soft start state of the second voltage conversion circuit.
Step S602, determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is the voltage conversion circuit performing soft start.
Step S603, determining a current value of the standby voltage conversion circuit during the soft start of the target voltage conversion circuit.
Step S604, performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result.
It is understood that the steps S601 to S604 are the same as the steps S101 to S104 described above, and are not described herein.
In step S605, if the occurrence of the misconnection is confirmed based on the misconnection detection result, the control target voltage conversion circuit stands by.
For example, after the misconnection detection is performed on the access of the photovoltaic panel according to the current value, after the misconnection detection result is obtained, if the misconnection detection result is that misconnection occurs, the target voltage conversion circuit can be controlled to stand by. For example, when the target voltage conversion circuit is the first voltage conversion circuit, the first voltage conversion circuit may be controlled to stand by. For another example, when the target voltage conversion circuit is the second voltage conversion circuit, the second voltage conversion circuit may be controlled to stand by.
For example, when the target voltage conversion circuit is controlled to stand by, the second switching tube in the target voltage conversion circuit may send a turn-off signal, so that the second switching tube in the target voltage conversion circuit disconnects the connection between the positive input terminal of the target voltage conversion circuit and the direct current bus according to the turn-off signal.
According to the embodiment, when the occurrence of the negative electrode misconnection is confirmed according to the misconnection detection result, the target voltage conversion circuit is controlled to stand by, so that the target voltage conversion circuit can be controlled to stand by in time, the target voltage conversion circuit is prevented from generating huge current impact, and the negative electrode misconnection is effectively prevented from burning the photovoltaic inverter.
The embodiment of the application also provides a computer readable storage medium, and the computer readable storage medium stores a computer program, wherein the computer program comprises program instructions, and a processor executes the program instructions to realize the access detection method of any photovoltaic panel provided by the embodiment of the application.
For example, the program is loaded by a processor, and the following steps may be performed:
acquiring a first soft start state of a first voltage conversion circuit and a second soft start state of a second voltage conversion circuit; determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is a voltage conversion circuit for executing soft start; determining a current value of the standby voltage conversion circuit in a process that the target voltage conversion circuit executes soft start; and performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result.
The computer readable storage medium may be an internal storage unit of the photovoltaic inverter of the foregoing embodiment, for example, a hard disk or a memory of the photovoltaic inverter. The computer readable storage medium may also be an external storage device of the photovoltaic inverter, such as a plug-in hard disk, smart Media Card (SMC), secure digital Card (Secure Digital Card, SD Card), flash memory Card (Flash Card) or the like, which are provided on the photovoltaic inverter.
Further, the computer-readable storage medium may mainly include a storage program area and a storage data area, wherein the storage program area may store an operating system, a program required for at least one function, and the like; the storage data area may store data created according to each program, and the like.
The present application is not limited to the above embodiments, and various equivalent modifications and substitutions can be easily made by those skilled in the art within the technical scope of the present application, and these modifications and substitutions are intended to be included in the scope of the present application. Therefore, the protection scope of the application is subject to the protection scope of the claims.
Claims (10)
1. The utility model provides a cut-in detection method of photovoltaic panel, its characterized in that is applied to photovoltaic inverter, photovoltaic inverter includes first voltage conversion circuit and second voltage conversion circuit, first voltage conversion circuit's input is used for being connected with first photovoltaic panel, first voltage conversion circuit's output is connected with direct current busbar, second voltage conversion circuit's input is used for being connected with second photovoltaic panel, second voltage conversion circuit's output with direct current busbar is connected, the cut-in detection method of photovoltaic panel includes:
Acquiring a first soft start state of the first voltage conversion circuit and a second soft start state of the second voltage conversion circuit;
determining a target voltage conversion circuit and a standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, wherein the target voltage conversion circuit is a voltage conversion circuit for executing soft start;
determining a current value of the standby voltage conversion circuit in a process of soft start of the target voltage conversion circuit;
and performing misconnection detection on the access of the photovoltaic panel according to the current value to obtain a misconnection detection result.
2. The method according to claim 1, wherein the first voltage conversion circuit includes a first switching tube for turning on or off a connection between a positive input terminal of the first voltage conversion circuit and a negative input terminal of the first voltage conversion circuit;
the obtaining the first soft start state of the first voltage conversion circuit includes:
acquiring a first bus voltage of the bus capacitor when the photovoltaic inverter is started;
Determining the duty ratio of the first switching tube at the current moment and the second bus voltage of the bus capacitor;
and determining the first soft start state according to the first bus voltage, the second bus voltage and the duty ratio.
3. The method of claim 2, wherein determining the first soft start state based on the first bus voltage, the second bus voltage, and the duty cycle comprises:
subtracting the second bus voltage from the first bus voltage to obtain a bus voltage difference;
and if the bus voltage difference is larger than a first preset voltage and the duty ratio is larger than a preset duty ratio, determining that the first soft start state is the soft start state.
4. The method for detecting access to a photovoltaic panel according to claim 1, wherein the obtaining the first soft start state of the first voltage conversion circuit comprises:
acquiring a soft start flag bit corresponding to the first voltage conversion circuit;
and determining the first soft start state according to the soft start flag bit.
5. The method according to claim 1, wherein determining the target voltage conversion circuit and the standby voltage conversion circuit from the first voltage conversion circuit and the second voltage conversion circuit according to the first soft start state and the second soft start state, comprises:
If the first soft start state is the soft start state, and the second soft start state is the soft start state, determining the first voltage conversion circuit as the target voltage conversion circuit and determining the second voltage conversion circuit as the standby voltage conversion circuit; or (b)
If the first soft start state is not in the soft start state, and the second soft start state is in the soft start state, determining the first voltage conversion circuit as the standby voltage conversion circuit and determining the second voltage conversion circuit as the target voltage conversion circuit; or (b)
And if the first soft start state is the soft start state and the second soft start state is the soft start state, determining one of the first voltage conversion circuit and the second voltage conversion circuit as the target voltage conversion circuit and the other voltage conversion circuit as the standby voltage conversion circuit.
6. The method according to claim 1, wherein the first voltage conversion circuit further comprises a second switching tube, and the second switching tube is used for switching on or off connection between the positive input terminal of the first voltage conversion circuit and the dc bus; after the target voltage conversion circuit and the standby voltage conversion circuit are determined from the first voltage conversion circuit and the second voltage conversion circuit, the method further comprises:
And if the first voltage conversion circuit is the standby voltage conversion circuit, sending a turn-off signal to the second switching tube, wherein the turn-off signal is used for indicating the second switching tube to disconnect the connection between the positive input end of the first voltage conversion circuit and the direct current bus.
7. The method according to claim 1, wherein determining a current value of the standby voltage conversion circuit during soft start performed by the target voltage conversion circuit comprises:
acquiring the soft start time length of the target voltage conversion circuit, and dividing the soft start time length into a plurality of sub-time lengths;
obtaining the maximum sub-current value of the standby voltage conversion circuit in each sub-time period;
and taking the maximum sub-current value in the sub-time length as the current value.
8. The method for detecting the access of a photovoltaic panel according to any one of claims 1 to 7, wherein after the step of performing the misconnection detection on the access of the photovoltaic panel according to the current value and obtaining the misconnection detection result, the method further comprises:
and if the occurrence of the misconnection is confirmed according to the misconnection detection result, controlling the target voltage conversion circuit to stand by.
9. The photovoltaic inverter is characterized by comprising a first voltage conversion circuit, a second voltage conversion circuit and a control circuit;
the input end of the first voltage conversion circuit is connected with the first photovoltaic panel, the output end of the first voltage conversion circuit is used for being connected with the direct current bus, the input end of the second voltage conversion circuit is used for being connected with the second photovoltaic panel, and the output end of the second voltage conversion circuit is connected with the direct current bus;
the control circuit for performing the access detection method of a photovoltaic panel according to any one of claims 1 to 8.
10. The photovoltaic inverter of claim 9 further comprising a current sampling circuit;
the current sampling circuit is respectively connected with the negative electrode input end of the first voltage conversion circuit and the negative electrode input end of the second voltage conversion circuit, and is used for sampling the current value flowing through the negative electrode input end.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310972805.1A CN117200690A (en) | 2023-08-03 | 2023-08-03 | Access detection method of photovoltaic panel, photovoltaic inverter and readable storage medium |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202310972805.1A CN117200690A (en) | 2023-08-03 | 2023-08-03 | Access detection method of photovoltaic panel, photovoltaic inverter and readable storage medium |
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| CN117200690A true CN117200690A (en) | 2023-12-08 |
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