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CN118192205A - Photovoltaic PID repair circuit and method - Google Patents

Photovoltaic PID repair circuit and method Download PDF

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Publication number
CN118192205A
CN118192205A CN202410390993.1A CN202410390993A CN118192205A CN 118192205 A CN118192205 A CN 118192205A CN 202410390993 A CN202410390993 A CN 202410390993A CN 118192205 A CN118192205 A CN 118192205A
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China
Prior art keywords
capacitor
circuit
photovoltaic module
photovoltaic
pid
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CN202410390993.1A
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Chinese (zh)
Inventor
袁伟军
郭元振
卢文
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Guangzhou Rimsea Technology Co ltd
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Guangzhou Rimsea Technology Co ltd
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Priority to CN202410390993.1A priority Critical patent/CN118192205A/en
Publication of CN118192205A publication Critical patent/CN118192205A/en
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    • GPHYSICS
    • G05CONTROLLING; REGULATING
    • G05BCONTROL OR REGULATING SYSTEMS IN GENERAL; FUNCTIONAL ELEMENTS OF SUCH SYSTEMS; MONITORING OR TESTING ARRANGEMENTS FOR SUCH SYSTEMS OR ELEMENTS
    • G05B11/00Automatic controllers
    • G05B11/01Automatic controllers electric
    • G05B11/36Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential
    • G05B11/42Automatic controllers electric with provision for obtaining particular characteristics, e.g. proportional, integral, differential for obtaining a characteristic which is both proportional and time-dependent, e.g. P. I., P. I. D.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Engineering & Computer Science (AREA)
  • Automation & Control Theory (AREA)
  • Photovoltaic Devices (AREA)

Abstract

The application provides a photovoltaic PID repair circuit and a method, wherein the photovoltaic PID repair circuit comprises: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the stored charge capacitor is respectively connected with a capacitor charging circuit or a capacitor discharging circuit through an automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module; when the automatic switching circuit detects that the photovoltaic module works, the automatic switching circuit is switched to the capacitor charging circuit; when the photovoltaic module does not work, switching to a capacitor discharging circuit; the storage charge capacitor is used for charging the storage charge capacitor and storing charges when the photovoltaic module works; and when the photovoltaic module does not work, electric charge is transferred to the cell panel repairing direction of the photovoltaic module, PID repairing is carried out, the existence of a power grid is not relied on during PID repairing, an additional power supply is not needed, and in addition, the circuit control is simple.

Description

Photovoltaic PID repair circuit and method
Technical Field
The application relates to the field of new energy, in particular to a photovoltaic PID repair circuit and method.
Background
With the vigorous development of the photovoltaic industry, the service life and power attenuation of photovoltaic modules are increasingly valued by the industry, wherein the PID effect is a very important factor affecting the power generation efficiency of the modules. PID (Potential Induced Degradation), potential induced attenuation effect refers to the phenomenon that leakage current exists between glass and packaging materials under the long-term high-voltage working state, especially under the special conditions of high temperature and high humidity, so that a large amount of charges are accumulated on the surface of a battery, a battery plate is passivated, the performance of the photovoltaic module is reduced, and the generated power is reduced.
The current schemes for improving the photovoltaic PID effect are mainly divided into three categories: one is an on-line type, i.e. the inhibition device and the photovoltaic module work simultaneously, preventing the generation of PID effect; one is offline, i.e., when the photovoltaic module is not operating (typically at night), repairing the photovoltaic module damaged by PID. The other is a hybrid type, namely, when the photovoltaic module works, the inhibiting device prevents the PID effect from generating, and when the photovoltaic module does not work, the inhibiting device repairs the PID damaged photovoltaic module. Repair schemes in the industry are typically implemented at night by applying a positive voltage to the negative electrode ground terminal of the battery assembly, or by applying a negative voltage to the positive electrode ground terminal of the battery assembly.
The existing off-line mode and hybrid photovoltaic PID repair method mainly has the following defects: the PID repair is carried out by relying on a power grid to provide power or an additional power supply, and the repair process often needs additional electric energy loss; repair circuit control is often complicated, and the realization is complicated, and the cost is higher.
Disclosure of Invention
Therefore, the application aims to provide a photovoltaic PID repair circuit and a method, which do not need to rely on a power grid to provide power or additional power supply, and the repair circuit is simple to control and low in cost.
The photovoltaic PID repair circuit provided by the embodiment of the application comprises: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is respectively connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module;
The automatic switching circuit is used for switching to the capacitor charging circuit when the photovoltaic module is detected to work; when the photovoltaic module is detected to be not working, switching to a capacitor discharging circuit;
The storage charge capacitor is used for being connected with the photovoltaic module through the capacitor charging circuit when the photovoltaic module works so as to enable the photovoltaic module to charge the storage charge capacitor and store charges; and when the photovoltaic module does not work, the capacitor discharging circuit is connected with the photovoltaic module, and charges are transferred to the cell panel repairing direction of the photovoltaic module to carry out PID repairing.
In some embodiments, in the photovoltaic PID repair circuit, the capacitance value of the stored charge capacitance is determined based on a property of the photovoltaic module.
In some embodiments, in the photovoltaic PID repair circuit, for the photovoltaic module of the P-type panel, the capacitor discharge circuit is configured to connect the negative PV-end of the P-type panel and the positive electrode of the storage charge capacitor, and connect the ground PE of the P-type panel and the negative electrode of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the negative PV-ground PE of the P-type panel;
The capacitor discharging circuit is used for connecting a grounding end PE of the N-type battery plate and an anode of the charge storage capacitor; and connecting the positive pole PV+ of the N-type cell plate and the negative pole of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the positive pole PV+ of the photovoltaic module by the grounding end PE.
In some embodiments, in the photovoltaic PID repair circuit, the automatic switching circuit includes a signal processing circuit and a switching circuit; the acquisition end of the signal processing circuit is connected with the photovoltaic module, and the output end of the signal processing circuit is connected with the control end of the change-over switch circuit;
The signal processing circuit is used for collecting state signals of the photovoltaic module, judging whether the photovoltaic module is in a working state or not based on the state signals, and outputting a switching control signal corresponding to a judging result to the switching circuit;
The switching circuit is used for receiving the switching control signal and controlling the capacitor charging circuit or the capacitor discharging circuit to be connected with the stored charge capacitor based on the switching control signal.
In some embodiments, in the photovoltaic PID repair circuit, the signal processing circuit uses a voltage regulator tube, the change-over switch circuit uses a relay, and the voltage regulator tube is connected in series with an input end of the relay;
The voltage signal is larger than or equal to the voltage stabilizing voltage of the voltage stabilizing tube when the photovoltaic module works; when the photovoltaic module does not work, the voltage signal is lower than the voltage stabilizing voltage of the voltage stabilizing tube.
In some embodiments, in the photovoltaic PID repair circuit, an input end of the relay is connected in parallel with a filter capacitor; and/or the input end of the relay is connected with an overvoltage protection circuit in parallel.
In some embodiments, in the photovoltaic PID repair circuit, a total current limiting resistor is connected in series between the stored charge capacitor and the automatic switching circuit, a charging current limiting resistor is connected in series in the capacitor charging circuit, and a discharging current limiting resistor is connected in series in the capacitor discharging circuit.
In some embodiments, in the photovoltaic PID repair circuit, a capacitive charge anti-reflection element is connected in series in the capacitive charge circuit; the capacitor discharge circuit is connected with a capacitor discharge anti-reflection element in series.
In some embodiments, there is also provided a photovoltaic PID repair method applied to a photovoltaic PID repair circuit, the photovoltaic PID repair circuit comprising: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module;
The photovoltaic PID repair method comprises the following steps:
The automatic switching circuit is switched to the capacitor charging circuit when detecting that the photovoltaic module works;
The storage charge capacitor is connected with the photovoltaic module through the capacitor charging circuit so that the photovoltaic module charges the storage charge capacitor and stores charges;
The automatic switching circuit is switched to the capacitor discharging circuit when detecting that the photovoltaic module does not work;
and the charge storage capacitor is communicated with the photovoltaic module through the capacitor discharging circuit, and charges are transferred to the cell panel repairing direction of the photovoltaic module to carry out PID repairing.
In some embodiments, in the photovoltaic PID repair method, the capacitance value of the storage charge capacitor is determined based on a property of the photovoltaic module.
The embodiment of the application provides a photovoltaic PID repair circuit and a method, wherein the photovoltaic PID repair circuit comprises the following components: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is respectively connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module; the automatic switching circuit automatically identifies whether the photovoltaic module works, switches to the capacitor charging circuit when detecting that the photovoltaic module works, and is communicated with the photovoltaic module through the capacitor charging circuit so as to charge the capacitor with the stored charge and store the charge by the photovoltaic module; when the photovoltaic module is detected to be not in operation, switching to a capacitor discharging circuit, and transferring charges to a cell plate repairing direction of the photovoltaic module by a charge storage capacitor to carry out PID repairing; the PID repairing method does not depend on the existence of a power grid, does not need an additional power supply, does not need to consume additional electric energy in the repairing process, is simple in circuit control, automatically identifies whether the photovoltaic module works, automatically switches to a repairing mode when the photovoltaic module does not work, and does not need complex control logic.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present application, the drawings that are needed in the embodiments will be briefly described below, it being understood that the following drawings only illustrate some embodiments of the present application and therefore should not be considered as limiting the scope, and other related drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 shows a schematic circuit diagram of a photovoltaic PID repair circuit according to an embodiment of the application;
FIG. 2 illustrates a photovoltaic PID repair circuit for a P-type panel according to an embodiment of the application;
FIG. 3 illustrates a photovoltaic PID repair circuit for an N-type panel according to an embodiment of the application;
FIG. 4 shows a charge-storage charge state diagram of a photovoltaic PID repair circuit according to an embodiment of the application;
FIG. 5 shows a circuit diagram of an automatic switching circuit according to an embodiment of the present application;
FIG. 6 is a circuit diagram of another automatic switching circuit according to an embodiment of the present application;
Fig. 7 shows a flowchart of a photovoltaic PID repair method according to an embodiment of the present application.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the embodiments of the present application more apparent, the technical solutions of the embodiments of the present application will be clearly and completely described with reference to the accompanying drawings in the embodiments of the present application, and it should be understood that the drawings in the present application are for the purpose of illustration and description only and are not intended to limit the scope of the present application. In addition, it should be understood that the schematic drawings are not drawn to scale. A flowchart, as used in this disclosure, illustrates operations implemented according to some embodiments of the present application. It should be understood that the operations of the flow diagrams may be implemented out of order and that steps without logical context may be performed in reverse order or concurrently. Moreover, one or more other operations may be added to or removed from the flow diagrams by those skilled in the art under the direction of the present disclosure.
In addition, the described embodiments are only some, but not all, embodiments of the application. The components of the embodiments of the present application generally described and illustrated in the figures herein may be arranged and designed in a wide variety of different configurations. Thus, the following detailed description of the embodiments of the application, as presented in the figures, is not intended to limit the scope of the application, as claimed, but is merely representative of selected embodiments of the application. All other embodiments, which can be made by a person skilled in the art without making any inventive effort, are intended to be within the scope of the present application.
It should be noted that the term "comprising" will be used in embodiments of the application to indicate the presence of the features stated hereafter, but not to exclude the addition of other features.
With the vigorous development of the photovoltaic industry, the service life and power attenuation of photovoltaic modules are increasingly valued by the industry, wherein the PID effect is a very important factor affecting the power generation efficiency of the modules. PID (Potential Induced Degradation), potential induced attenuation effect refers to the phenomenon that leakage current exists between glass and packaging materials under the long-term high-voltage working state, especially under the special conditions of high temperature and high humidity, so that a large amount of charges are accumulated on the surface of a battery, a battery plate is passivated, the performance of the photovoltaic module is reduced, and the generated power is reduced.
The current schemes for improving the photovoltaic PID effect are mainly divided into three categories: one is an on-line type, i.e. the inhibition device and the photovoltaic module work simultaneously, preventing the generation of PID effect; one is offline, i.e., when the photovoltaic module is not operating (typically at night), repairing the photovoltaic module damaged by PID. The other is a hybrid type, namely, when the photovoltaic module works, the inhibiting device prevents the PID effect from generating, and when the photovoltaic module does not work, the inhibiting device repairs the PID damaged photovoltaic module. Repair schemes in the industry are typically implemented at night by applying a positive voltage to the negative electrode ground terminal of the battery assembly, or by applying a negative voltage to the positive electrode ground terminal of the battery assembly.
The existing off-line mode and hybrid photovoltaic PID repair method mainly has the following defects: the PID repair is carried out by relying on a power grid to provide power or an additional power supply, and the repair process often needs additional electric energy loss; repair circuit control is often complicated, and the realization is complicated, and the cost is higher. For example, the high voltage is generated between the negative electrode of the photovoltaic module and the grounding end through the rectification voltage doubling circuit when the power is taken from the power grid, so that charges accumulated by the negative bias voltage between the negative electrode and the ground in the daytime of the PID photovoltaic module are released, and the PID effect photovoltaic module is repaired; the method relies on the existence of a power grid during repair and requires ACDC rectifying circuits. For example, PID repair and bus pre-charging functions are realized through switching of a power supply circuit and each switch; the method relies on an external power supply circuit and a number of switching circuits. For example, the accumulated charge is calculated by sampling leakage current, and then whether and how long to perform PID repair are determined by the control of the adjustable direct current; the method requires a leakage current detector, an adjustable power supply and a controller.
Based on this, in an embodiment of the present application, a photovoltaic PID repair circuit and a method are provided, where the photovoltaic PID repair circuit includes: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is respectively connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module; the automatic switching circuit automatically identifies whether the photovoltaic module works, switches to the capacitor charging circuit when detecting that the photovoltaic module works, and is communicated with the photovoltaic module through the capacitor charging circuit so as to charge the capacitor with the stored charge and store the charge by the photovoltaic module; when the photovoltaic module is detected to be not in operation, switching to a capacitor discharging circuit, and transferring charges to a cell plate repairing direction of the photovoltaic module by a charge storage capacitor to carry out PID repairing; the PID repairing method does not depend on the existence of a power grid, does not need an additional power supply, does not need to consume additional electric energy in the repairing process, is simple in circuit control, automatically identifies whether the photovoltaic module works, automatically switches to a repairing mode when the photovoltaic module does not work, and does not need complex control logic.
Specifically, referring to fig. 1 below, fig. 1 shows a schematic circuit diagram of a photovoltaic PID repair circuit according to an embodiment of the present application; as shown in fig. 1, the PID repair circuit includes: a stored charge capacitor 101, a capacitor charging circuit 103, a capacitor discharging circuit 104, and an automatic switching circuit 102; the stored charge capacitor 101 is connected with a capacitor end of the capacitor charging circuit 103 or a capacitor end of the capacitor discharging circuit 104 through the automatic switching circuit 102 respectively; the photovoltaic end of the capacitor charging circuit 103 and the photovoltaic end of the capacitor discharging circuit 104 are respectively connected with the photovoltaic module 105;
The automatic switching circuit 102 is configured to switch to the capacitor charging circuit 103 when detecting that the photovoltaic module 105 is operating; and switching to the capacitive discharge circuit 104 upon detecting that the photovoltaic module 105 is not operating;
The charge storage capacitor 101 is configured to be turned on by the capacitor charging circuit 103 and the photovoltaic module 105 when the photovoltaic module 105 is in operation, so that the photovoltaic module 105 charges the charge storage capacitor 101 and stores charges; and when the photovoltaic module 105 does not work, the capacitor discharging circuit 104 is connected with the photovoltaic module 105, and charges are transferred to the cell plate repairing direction of the photovoltaic module 105 to carry out PID repairing.
Specifically, the capacitance value of the storage charge capacitor is determined based on the properties of the photovoltaic module. The properties of the photovoltaic module include the number of panels, etc. In the photovoltaic module with different attributes, the accumulated charges on the surface of the battery are different, so that the capacity value of the storage charge capacitor is determined based on the attributes of the photovoltaic module, and when the charge on the storage charge capacitor is discharged, the PID repair of the photovoltaic module is finished, and the electric energy required by the PID repair of the photovoltaic module is not required to be controlled through a complex algorithm.
Because PID repair current is basically in mA and uA stages, the PID repair current can be realized without a large energy storage capacitor.
The capacity value of the storage charge capacitor is determined based on the charges accumulated by the photovoltaic PID effect of the photovoltaic module, so that the charges stored in the storage charge capacitor cannot be more or too little when the PID repair is carried out on the photovoltaic module, and therefore, whether the PID repair is carried out or not and how long the PID repair is carried out are not needed to be determined through complex calculation.
Based on this, the stored charge capacitance in the repair circuit has the following effects: the photovoltaic module can automatically discharge the storage charge capacitor when working, and automatically control the storage charge capacitor to discharge when working is finished, so that the repairing process does not depend on the existence of a power grid, does not need an additional power supply and does not need to consume additional electric energy; the control of the charge required by PID repair is realized based on the capacitance value of the capacitor, the charge required by PID repair is not required to be calculated through complex components or processing procedures, and the control is performed through the time length; because the control process is simple and the power grid or an additional power supply is not required to be connected, the whole repair circuit has a simple structure, is easy to realize and has lower cost.
The storage charge capacitor is respectively connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module; that is, the automatic switching circuit is connected to the capacitor end of the capacitor charging circuit, so that the capacitor for storing charge is connected through the capacitor charging circuit and the photovoltaic module; or the automatic switching circuit is connected with the capacitor end of the capacitor charging circuit, so that the capacitor for storing charge is connected with the photovoltaic module through the capacitor discharging circuit.
Specifically, in the photovoltaic PID repair circuit according to the embodiment of the present application, for the photovoltaic module of the P-type panel, the capacitor discharge circuit is configured to connect the negative electrode PV-end of the P-type panel and the positive electrode of the storage charge capacitor, and connect the ground terminal PE of the P-type panel and the negative electrode of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the negative electrode PV-ground terminal PE of the P-type panel;
The panels of photovoltaic modules are of different types, generally comprising P-type panels and N-type panels. In the embodiment of the application, specific wiring relations of the capacitor discharging circuit, the capacitor charging circuit and the photovoltaic module are different aiming at the photovoltaic module of the P-type battery plate and the photovoltaic module of the N-type battery plate.
Referring to fig. 2 and 3, fig. 2 shows a photovoltaic PID repair circuit for a P-type panel according to an embodiment of the present application, and fig. 3 shows a photovoltaic PID repair circuit for an N-type panel according to an embodiment of the present application.
Referring to fig. 2 and 3, for the photovoltaic module of the N-type panel, the capacitor discharging circuit is configured to connect the ground terminal PE of the N-type panel and the positive electrode of the charge storage capacitor; and connecting the positive pole PV+ of the N-type cell plate and the negative pole of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the positive pole PV+ of the photovoltaic module by the grounding end PE.
Specifically, the automatic switching circuit is used for collecting a state signal of the photovoltaic module, judging whether the photovoltaic module works or not based on the state signal, and switching to the capacitor charging circuit when the photovoltaic module works; and switching to the capacitor discharge circuit when the photovoltaic module is detected to be not working.
Correspondingly, the photovoltaic PID repair circuit has two states, namely a capacitor charging and storing charge state and a capacitor discharging repair state.
The photovoltaic PID repair circuit enters an operation mode after being connected with the photovoltaic module, and the automatic switching circuit starts to judge whether the photovoltaic module works or not, and the mode of judging whether the module works or not is generally to judge whether the voltage reaches a switching threshold voltage Vth or not.
Specifically, when the real-time voltage of the photovoltaic module is greater than or equal to the switching threshold voltage Vth, the photovoltaic module is considered to enter a working state, PID repair is not needed at this time, the photovoltaic PID repair circuit is switched to a capacitor charging state through the automatic switching circuit, and the capacitor stores charges as electric energy required by PID repair. When the photovoltaic module is judged not to be in a working state, the voltage of the photovoltaic module is generally lower than the threshold voltage Vth, the system can automatically control the switch to be switched to a PID repair state, namely a capacitor discharge state, and the photovoltaic PID repair circuit starts to reversely charge the anode PV+ of the photovoltaic module at the cathode PV-grounding end PE or the grounding end PE, so that charges accumulated at the PV- (or PV+) and PE ends in the working engineering of the photovoltaic module are discharged, and the PID repair effect of the photovoltaic module is achieved.
In the PID repair process, whether the photovoltaic module works or not can be always judged, and once the photovoltaic module enters a working state, the photovoltaic PID repair circuit can immediately stop repairing and switch to a capacitor charging state. And when the charge on the charge storage capacitor is discharged, the PID repair of the photovoltaic module is finished, the next photovoltaic module work is waited for charging the capacitor to store the charge, and the next work cycle is entered.
Referring to fig. 2 and 3, in the photovoltaic PID repair circuit, a total current limiting resistor is connected in series between the stored charge capacitor and the automatic switching circuit, a charging current limiting resistor is connected in series in the capacitor charging circuit, and a discharging current limiting resistor is connected in series in the capacitor discharging circuit.
Referring to fig. 2 and 3, in the photovoltaic PID repair circuit, a capacitor charging anti-reflection element is connected in series in the capacitor charging circuit;
the capacitor discharge circuit is connected with a capacitor discharge anti-reflection element in series.
Specifically, referring to fig. 2 and 3, the photovoltaic PID repairing circuit can operate in different states, including a capacitor charging and storing charge state (hereinafter referred to as charging state), a capacitor discharging repairing state (hereinafter referred to as discharging state), and repairing to a standby state.
The charge storage capacitor C is used for storing electric energy required by PID repair, and different capacitance values can be selected according to the attributes such as the number of the battery plates of the photovoltaic module.
And the total current limiting resistor R is used for limiting the charging and discharging current of the total loop.
The first switch SW1 and the second switch SW2 in the automatic switching circuit are used for switching to a charging state or a discharging state, and may be an integral two-way switch or independent two switches, and may be a mechanical relay, an optical isolation relay, an electronic switch, and the like.
The number of the discharge current limiting resistors can be multiple, and in the embodiment of the application, the first discharge current limiting resistor Rd1 and the second discharge current limiting resistor Rd2 are included, because PID is mAuA levels, and the photovoltaic modules are generally more than hundred volts after being connected in series, the two discharge current limiting resistors are generally more than hundred K ohms, and the current is limited to micro current, so that the electric shock safety risk caused by careless touch of a human body in the repairing process can be avoided.
The number of the charging current limiting resistors can be multiple, and in the embodiment of the application, the charging current limiting resistors comprise a first charging current limiting resistor Rc1 and a second charging current limiting resistor Rc2; the charging current limiting resistor is used for preventing the impact current to the storage charge capacitor C, and the first charging current limiting resistor Rc1 and the second charging current limiting resistor Rc2 can select tens of K ohms because the daytime working time of the photovoltaic module is generally longer.
The number of the capacitor discharge anti-reflection elements can be also multiple, and in the embodiment of the application, the capacitor discharge anti-reflection elements adopt anti-reflection diodes. Specifically, the anti-reverse discharge protection device comprises two anti-reverse discharge protection diodes (a first anti-reverse diode D1 and a third anti-reverse diode D3), so that the stored charges in the stored charge capacitor C in the discharging process are only transferred to the repairing direction of the battery plate, and the current is prevented from reversing.
The number of the capacitor charging anti-reflection elements can be also multiple, and the capacitor charging anti-reflection elements adopt anti-reflection diodes. The anti-reverse diode (the second anti-reverse diode D2 and the fourth anti-reverse diode D4) is used for charging the two capacitors, so that current is only charged to the storage charge capacitor C in the charging process, reverse discharge can not occur when the PV voltage is lower than the voltage of the storage charge capacitor C, and the charge of the storage charge capacitor C before PID repair is prevented from being discharged in advance.
Referring to fig. 2, the photovoltaic PID repair circuit shown in fig. 2 is a circuit for performing PID repair on a P-type panel, in which a first switch SW1 and a second switch SW1 are connected to a capacitor discharge circuit, the photovoltaic PID repair circuit is in a PID repair state at this time, a current direction in the circuit is as an arrow direction, charges stored in a stored charge capacitor C pass through a total current limiting resistor R, the first switch SW1, the first discharge current limiting resistor Rd1, a first anti-reflection diode D1 to a negative electrode PV-of a photovoltaic module, return to a ground end PE through an equivalent capacitor Ceq (Ceq is an equivalent negative electrode PV-of the photovoltaic module, and a ground end PE capacitor), and return to a negative electrode of the stored charge capacitor C through a second discharge current limiting resistor 2 and a third anti-reflection diode Rd 3. The reverse voltage is applied to the equivalent capacitor Ceq in the process, and accumulated charges are counteracted, so that PID repair is realized. When the stored charge capacitor C is placed to the cut-off voltage of the first anti-reflection diode D1 and the third anti-reflection diode D3, discharging is stopped, after the PID repair process is finished, the photovoltaic module is waited to work again, and the next cycle is entered.
The photovoltaic PID repair circuit is also suitable for PID repair of the N-type battery plate, and for N-type battery plate application, only the wiring of the output terminal is required to be changed, and the capacitor discharge port is connected with the grounding end PE and the positive pole PV+. Fig. 3 is a circuit diagram of an N-type panel PID repair state, in which the current direction is the arrow direction, the charge stored in the stored charge capacitor C returns to the positive electrode pv+ through the total current limiting resistor R, the first switch SW1, the first discharge current limiting resistor Rd1, the first anti-reflection diode D1 to the grounded end PE of the photovoltaic module, and returns to the negative electrode of the stored charge capacitor C through the equivalent capacitor Ceq (corresponding, ceq is the equivalent PE versus PV-capacitor), and then returns to the negative electrode of the stored charge capacitor C through the second discharge current limiting resistor Rd2 and the third anti-reflection diode D3. And when the stored charge capacitor C discharges to the cut-off voltage of the first anti-reflection diode D1 and the third anti-reflection diode D3, stopping discharging, completing the PID repair process, waiting for the photovoltaic module to work again, and entering the next cycle.
Referring to fig. 4, fig. 4 shows a charge storage charge state diagram of the photovoltaic PID repair circuit according to the embodiment of the present application, at this time, the photovoltaic module starts to operate, i.e., the first switch SW1 and the second switch SW2 of the automatic switching circuit are connected to the capacitor charge circuit, as shown by an arrow, the current direction of the photovoltaic module is shown by the positive pole pv+ of the photovoltaic module, the first charge current limiting resistor Rc1, the second anti-reverse diode D2, the total current limiting resistor R and the second charge current limiting resistor Rc2, the fourth anti-reverse diode D4, and the positive pole PV-of the photovoltaic module charge the storage charge capacitor C, when the voltage of the storage charge capacitor C reaches the voltage Vpv-VD2-VD 4=a preset voltage threshold (the higher the number of the photovoltaic panel series is), the higher the preset voltage threshold is the higher, VD2 is the voltage of the second anti-reverse diode D2, and VD4 is the voltage of the fourth anti-reverse diode D4), and the storage capacitor C stops when the voltage of the storage charge capacitor C reaches the voltage Vpv-VD2, and the photovoltaic module maintains the voltage v-VD2, and the voltage SW reaches the preset voltage threshold value, and the photovoltaic module stops to enter the charge state, and the photovoltaic module stops the charge storage charge state, and the photovoltaic module reaches the charge storage state, and the photovoltaic module reaches the state.
The automatic switching circuit in the embodiment of the application can be realized by a digital circuit or an analog circuit, including but not limited to an MCU control circuit, a voltage sampling comparison and logic control circuit, a current sampling comparison and logic control circuit. The switch of the automatic switching circuit can also be in various forms, including but not limited to electromagnetic relay, optocoupler switch, switch Huang Ji, mos and other electronic switches.
In the embodiment of the application, the automatic switching circuit comprises a signal processing circuit and a switching circuit; the acquisition end of the signal processing circuit is connected with the photovoltaic module, and the output end of the signal processing circuit is connected with the control end of the change-over switch circuit;
The signal processing circuit is used for collecting state signals of the photovoltaic module, judging whether the photovoltaic module is in a working state or not based on the state signals, and outputting a switching control signal corresponding to a judging result to the switching circuit;
The switching circuit is used for receiving the switching control signal and controlling the capacitor charging circuit or the capacitor discharging circuit to be connected with the stored charge capacitor based on the switching control signal.
The status signal of the photovoltaic module can be a voltage signal or a current signal of the photovoltaic module.
In the photovoltaic PID repair circuit provided by the embodiment of the application, the signal processing circuit adopts a voltage stabilizing tube, the change-over switch circuit adopts a relay, and the voltage stabilizing tube is connected with the input end of the relay in series; the voltage signal is larger than or equal to the voltage stabilizing voltage of the voltage stabilizing tube when the photovoltaic module works; when the photovoltaic module does not work, the voltage signal is lower than the voltage stabilizing voltage of the voltage stabilizing tube.
The voltage stabilizing tube is used for adjusting the switching threshold voltage of the automatic switching circuit.
Specifically, one end of the voltage stabilizing tube is connected with the positive pole PV+ of the photovoltaic module in series, and the other end of the voltage stabilizing tube is connected with the input end of the relay and the negative pole PV-of the photovoltaic module in series.
In some embodiments, the voltage stabilizing tube is further connected in series with a switch current limiting resistor.
In the photovoltaic PID repair circuit provided by the embodiment of the application, the input end of the relay is connected with the filter capacitor in parallel; and/or the input end of the relay is connected with an overvoltage protection circuit in parallel.
That is, the input end of the relay can be connected with the filter capacitor in parallel, or connected with the overvoltage protection circuit in parallel to protect the relay, or connected with the filter capacitor and the overvoltage protection circuit in parallel.
Referring to fig. 5 and 6, fig. 5 shows a circuit diagram of an automatic switching circuit according to an embodiment of the application; FIG. 6 shows a circuit diagram of another automatic switching circuit; an electromagnetic relay is used in fig. 5, and an optocoupler relay is used in fig. 6.
As shown in fig. 5 and 6, the power supply of the automatic switching circuit is connected to the positive pole pv+ and the negative pole PV-, and the voltage stabilizing tube ZD1 for adjusting the threshold voltage is connected in series with a switch current limiting resistor R1 and is connected in series between the positive pole pv+ and the negative pole PV-. The voltage regulator ZD1 is used for adjusting the switching threshold voltage, and specifically, the switching threshold voltage Vth of the automatic switching circuit is changed by changing the voltage regulator of the voltage regulator ZD 1.
The filter capacitor C1 with parallel relay input ends shown in fig. 5 or the filter capacitor C2 with parallel relay input ends shown in fig. 6 is used for preventing the interference signal from conducting the switch by mistake, and meanwhile, delay switching can be realized through the filter capacitor C1 or the filter capacitor C2.
The overvoltage protection circuit adopts a zener diode ZD2 and the zener diode ZD2, and is used for protecting the driving voltage of the change-over switch from overvoltage damage. The automatic switching circuit realizes that when the voltage of the photovoltaic module is greater than or equal to the threshold voltage Vth (the photovoltaic module works), the switching circuit is switched to the charge state of the storage charge capacitor C, and when the voltage of the photovoltaic module is lower than the threshold voltage Vth (the photovoltaic module does not work), the switching circuit is switched to the discharge state (PID repair state or standby state) of the storage charge capacitor C, so that the automatic control of the whole photovoltaic PID repair circuit is realized.
Based on the same inventive concept, the embodiment of the application also provides a photovoltaic PID repair method corresponding to the photovoltaic PID repair circuit, and because the principle of solving the problem of the photovoltaic PID repair method in the embodiment of the application is similar to that of the photovoltaic PID repair circuit in the embodiment of the application, the implementation of the method can be referred to the implementation of the circuit, and the repetition is omitted.
Referring to fig. 7, fig. 7 shows a flowchart of a photovoltaic PID repair method according to an embodiment of the present application, where the method is applied to a photovoltaic PID repair circuit, and the photovoltaic PID repair circuit includes: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module;
The photovoltaic PID repair method comprises the following steps of S701-S704:
S701, when the automatic switching circuit detects that the photovoltaic module works, switching to a capacitor charging circuit;
S702, the stored charge capacitor is connected with the photovoltaic module through the capacitor charging circuit so that the photovoltaic module charges the stored charge capacitor and stores charges;
S703, when the automatic switching circuit detects that the photovoltaic module does not work, switching to a capacitor discharging circuit;
And S704, the charge storage capacitor is connected with the photovoltaic module through the capacitor discharging circuit, and charges are transferred to the cell panel repairing direction of the photovoltaic module to carry out PID repairing.
In some embodiments, in the photovoltaic PID repair method, the capacitance value of the storage charge capacitor is determined based on a property of the photovoltaic module.
In some embodiments, in the photovoltaic PID repair method, the capacitor discharging circuit is configured to connect the negative PV-end of the P-type panel and the positive electrode of the storage charge capacitor, and connect the ground PE of the P-type panel and the negative electrode of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the negative PV-ground PE of the P-type panel;
The capacitor discharging circuit is used for connecting a grounding end PE of the N-type battery plate and an anode of the charge storage capacitor; and connecting the positive pole PV+ of the N-type cell plate and the negative pole of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the positive pole PV+ of the photovoltaic module by the grounding end PE.
In some embodiments, in the photovoltaic PID repair method, the automatic switching circuit includes a signal processing circuit and a switching circuit; the acquisition end of the signal processing circuit is connected with the photovoltaic module, and the output end of the signal processing circuit is connected with the control end of the change-over switch circuit;
The signal processing circuit is used for collecting state signals of the photovoltaic module, judging whether the photovoltaic module is in a working state or not based on the state signals, and outputting a switching control signal corresponding to a judging result to the switching circuit;
the switching circuit receives the switching control signal and controls the capacitor charging circuit or the capacitor discharging circuit to be connected with the stored charge capacitor based on the switching control signal.
In some embodiments, in the photovoltaic PID repair method, the signal processing circuit adopts a voltage stabilizing tube, the change-over switch circuit adopts a relay, and the voltage stabilizing tube is connected in series with an input end of the relay;
The voltage signal is larger than or equal to the voltage stabilizing voltage of the voltage stabilizing tube when the photovoltaic module works; when the photovoltaic module does not work, the voltage signal is lower than the voltage stabilizing voltage of the voltage stabilizing tube.
In some embodiments, in the photovoltaic PID repair method, an input end of the relay is connected in parallel with a filter capacitor; and/or the input end of the relay is connected with an overvoltage protection circuit in parallel.
In some embodiments, in the photovoltaic PID repair method, a total current limiting resistor is connected in series between the stored charge capacitor and the automatic switching circuit, a charging current limiting resistor is connected in series in the capacitor charging circuit, and a discharging current limiting resistor is connected in series in the capacitor discharging circuit.
In some embodiments, in the photovoltaic PID repair method, a capacitor charging anti-reflection element is connected in series in the capacitor charging circuit;
the capacitor discharge circuit is connected with a capacitor discharge anti-reflection element in series.
It will be clear to those skilled in the art that, for convenience and brevity of description, specific working procedures of the above-described system and apparatus may refer to corresponding procedures in the method embodiments, and are not repeated in the present disclosure. In the several embodiments provided by the present application, it should be understood that the disclosed systems, devices, and methods may be implemented in other manners. The above-described apparatus embodiments are merely illustrative, and the division of the modules is merely a logical function division, and there may be additional divisions when actually implemented, and for example, multiple modules or components may be combined or integrated into another system, or some features may be omitted or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some communication interface, indirect coupling or communication connection of devices or modules, electrical, mechanical, or other form.
The modules described as separate components may or may not be physically separate, and components shown as modules may or may not be physical units, may be located in one place, or may be distributed over multiple network units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present application may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit.
The functions, if implemented in the form of software functional units and sold or used as a stand-alone product, may be stored in a non-volatile computer readable storage medium executable by a processor. Based on this understanding, the technical solution of the present application may be embodied essentially or in a part contributing to the prior art or in a part of the technical solution, in the form of a software product stored in a storage medium, comprising several instructions for causing a computer device (which may be a personal computer, a platform server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present application. And the aforementioned storage medium includes: a usb disk, a removable hard disk, a ROM, a RAM, a magnetic disk, or an optical disk, etc.
The foregoing is merely illustrative of the present application, and the present application is not limited thereto, and any person skilled in the art will readily appreciate variations or alternatives within 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. A photovoltaic PID repair circuit, comprising: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is respectively connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module;
The automatic switching circuit is used for switching to the capacitor charging circuit when the photovoltaic module is detected to work; when the photovoltaic module is detected to be not working, switching to a capacitor discharging circuit;
The storage charge capacitor is used for being connected with the photovoltaic module through the capacitor charging circuit when the photovoltaic module works so as to enable the photovoltaic module to charge the storage charge capacitor and store charges; and when the photovoltaic module does not work, the capacitor discharging circuit is connected with the photovoltaic module, and charges are transferred to the cell panel repairing direction of the photovoltaic module to carry out PID repairing.
2. The photovoltaic PID repair circuit of claim 1, wherein the capacitance value of the stored charge capacitance is determined based on a property of a photovoltaic module.
3. The photovoltaic PID repair circuit of claim 1, wherein,
The capacitor discharging circuit is used for connecting the negative pole PV-end of the P-type battery plate with the positive pole of the storage charge capacitor and connecting the grounding end PE of the P-type battery plate with the negative pole of the storage charge capacitor so that the electric energy of the storage charge capacitor is applied to the negative pole PV-grounding end PE of the P-type battery plate;
The capacitor discharging circuit is used for connecting a grounding end PE of the N-type battery plate and an anode of the charge storage capacitor; and connecting the positive pole PV+ of the N-type cell plate and the negative pole of the storage charge capacitor, so that the electric energy of the storage charge capacitor is applied to the positive pole PV+ of the photovoltaic module by the grounding end PE.
4. The photovoltaic PID repair circuit of claim 1, wherein the automatic switching circuit comprises a signal processing circuit and a switching circuit; the acquisition end of the signal processing circuit is connected with the photovoltaic module, and the output end of the signal processing circuit is connected with the control end of the change-over switch circuit;
The signal processing circuit is used for collecting state signals of the photovoltaic module, judging whether the photovoltaic module is in a working state or not based on the state signals, and outputting a switching control signal corresponding to a judging result to the switching circuit;
The switching circuit is used for receiving the switching control signal and controlling the capacitor charging circuit or the capacitor discharging circuit to be connected with the stored charge capacitor based on the switching control signal.
5. The photovoltaic PID repair circuit of claim 4, wherein the signal processing circuit employs a voltage regulator tube, the change-over switching circuit employs a relay, and the voltage regulator tube is connected in series with an input end of the relay;
The voltage signal is larger than or equal to the voltage stabilizing voltage of the voltage stabilizing tube when the photovoltaic module works; when the photovoltaic module does not work, the voltage signal is lower than the voltage stabilizing voltage of the voltage stabilizing tube.
6. The photovoltaic PID repair circuit of claim 5, wherein the input of the relay is connected in parallel with a filter capacitor; and/or the input end of the relay is connected with an overvoltage protection circuit in parallel.
7. The photovoltaic PID repair circuit of claim 1, wherein a total current limiting resistor is connected in series between the stored charge capacitor and the automatic switching circuit, a charge current limiting resistor is connected in series in the capacitor charging circuit, and a discharge current limiting resistor is connected in series in the capacitor discharging circuit.
8. The photovoltaic PID repair circuit of claim 1 or 7,
The capacitor charging circuit is connected with a capacitor charging anti-reflection element in series;
the capacitor discharge circuit is connected with a capacitor discharge anti-reflection element in series.
9. A photovoltaic PID repair method, characterized by being applied to a photovoltaic PID repair circuit, the photovoltaic PID repair circuit comprising: a stored charge capacitor, a capacitor charging circuit, a capacitor discharging circuit and an automatic switching circuit; the storage charge capacitor is connected with a capacitor end of the capacitor charging circuit or a capacitor end of the capacitor discharging circuit through the automatic switching circuit; the photovoltaic end of the capacitor charging circuit and the photovoltaic end of the capacitor discharging circuit are respectively connected with the photovoltaic module;
The photovoltaic PID repair method comprises the following steps:
The automatic switching circuit is switched to the capacitor charging circuit when detecting that the photovoltaic module works;
The storage charge capacitor is connected with the photovoltaic module through the capacitor charging circuit so that the photovoltaic module charges the storage charge capacitor and stores charges;
The automatic switching circuit is switched to the capacitor discharging circuit when detecting that the photovoltaic module does not work;
and the charge storage capacitor is communicated with the photovoltaic module through the capacitor discharging circuit, and charges are transferred to the cell panel repairing direction of the photovoltaic module to carry out PID repairing.
10. The method of claim 9, wherein the capacitance value of the stored charge capacitor is determined based on a property of the photovoltaic module.
CN202410390993.1A 2024-04-02 2024-04-02 Photovoltaic PID repair circuit and method Pending CN118192205A (en)

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Application Number Priority Date Filing Date Title
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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118508511A (en) * 2024-07-17 2024-08-16 浙江大学 A PID effect repair circuit and control method based on photovoltaic inverter

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN118508511A (en) * 2024-07-17 2024-08-16 浙江大学 A PID effect repair circuit and control method based on photovoltaic inverter

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