CN116232216A - PID repair circuit, inverter and photovoltaic system - Google Patents
PID repair circuit, inverter and photovoltaic system Download PDFInfo
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- 230000008439 repair process Effects 0.000 title claims abstract description 44
- 238000007781 pre-processing Methods 0.000 claims abstract description 17
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- 238000004804 winding Methods 0.000 claims description 33
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02S—GENERATION OF ELECTRIC POWER BY CONVERSION OF INFRARED RADIATION, VISIBLE LIGHT OR ULTRAVIOLET LIGHT, e.g. USING PHOTOVOLTAIC [PV] MODULES
- H02S40/00—Components or accessories in combination with PV modules, not provided for in groups H02S10/00 - H02S30/00
- H02S40/30—Electrical components
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/381—Dispersed generators
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/20—The dispersed energy generation being of renewable origin
- H02J2300/22—The renewable source being solar energy
- H02J2300/24—The renewable source being solar energy of photovoltaic origin
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Abstract
The application discloses a PID repair circuit, an inverter and a photovoltaic system. The PID repair circuit comprises a preprocessing module, a control module and a boosting module. The power grid is connected with the pretreatment module, and the boosting module is respectively connected with the pretreatment module, the photovoltaic module and the control module. The preprocessing module is used for rectifying and converting voltage of an alternating current power supply of the power grid so as to output at least one direct current voltage. The control module is used for outputting a first control signal to the boosting module when the photovoltaic module stops running. The boosting module is used for boosting a first direct-current voltage in the at least one direct-current voltage in response to the first control signal and outputting the first voltage to the photovoltaic module so as to repair the PID effect of the photovoltaic module. By the mode, the PID effect of the photovoltaic module can be repaired.
Description
Technical Field
The application relates to the technical field of power electronics, in particular to a PID repair circuit, an inverter and a photovoltaic system.
Background
In order to reduce the cost of the photovoltaic system and improve the power generation capacity of the photovoltaic system, the voltage configuration of the photovoltaic module of the photovoltaic system is higher and higher, and a high-voltage photovoltaic system (for example, a 1500V high-voltage photovoltaic system) gradually becomes the main stream of the market.
However, an increase in the photovoltaic system voltage may result in the photovoltaic unit being subjected to a higher positive or negative bias to ground. Especially under special conditions such as high temperature and high humidity, PID (Potential Induced Degradation, potential induced attenuation) effect can appear in the photovoltaic module, and open-circuit voltage, short-circuit current, filling factor of the photovoltaic module are reduced, so that output power of the photovoltaic system is gradually reduced. Therefore, how to repair the PID effect of the photovoltaic module is important.
Disclosure of Invention
The application aims to provide a PID repair circuit, an inverter and a photovoltaic system, which can realize the repair of the PID effect of a photovoltaic module.
To achieve the above object, in a first aspect, the present application provides a PID repair circuit, including:
the pretreatment module is connected with the power grid and used for rectifying and converting the voltage of an alternating current power supply of the power grid so as to output at least one direct current voltage;
the control module is connected with the boosting module and used for outputting a first control signal to the boosting module when the photovoltaic module stops running;
the boosting module is also respectively connected with the preprocessing module and the photovoltaic module, and is used for boosting a first direct-current voltage in at least one direct-current voltage in response to a first control signal and outputting the first voltage to the photovoltaic module so as to repair the PID effect of the photovoltaic module.
In an alternative manner, the control module is further configured to output a second control signal to the boost module when the photovoltaic module is running;
the boost module is further configured to stop outputting the first voltage in response to the second control signal.
In an alternative, the control module is further configured to: acquiring storage information, wherein the storage information comprises at least one of current, voltage and time;
and determining the current state of the photovoltaic module based on the stored information, wherein the current state of the photovoltaic module comprises the running state and the running stopping state of the photovoltaic module.
In an alternative, the at least one dc voltage further comprises a second dc voltage;
and when the photovoltaic module stops running, the second direct-current voltage supplies power for the control module.
In an alternative way, the at least one dc voltage further comprises a third dc voltage, the third dc voltage powering the boost module.
In an alternative manner, the PID repair circuit further comprises a level switching module;
the level switching module is connected with the voltage boosting module and the photovoltaic module respectively, and is used for outputting voltages of different levels to the photovoltaic module based on the first voltage by changing the resistance value of the level switching module.
In an alternative mode, the level switching module comprises a first resistor, a second resistor, a third resistor and a silicon controlled rectifier, wherein the silicon controlled rectifier comprises a light emitter and a light receiver;
the first end of the first resistor is connected with the first ends of the boosting module and the second resistor respectively, the first end of the second resistor is connected with the first end of the light receiver, the second end of the light receiver is connected with the second end of the first resistor and the first end of the third resistor respectively, the first end of the light emitter is used for inputting a switching signal, and the second end of the light emitter is grounded.
In an alternative mode, the preprocessing module comprises a rectifying unit and a flyback unit;
the rectification unit is connected with the power grid, and is used for rectifying alternating current of the power grid and outputting a first power supply;
the flyback unit is connected with the rectifying unit and is used for carrying out voltage conversion on the voltage of the first power supply so as to output at least one direct-current voltage.
In an alternative manner, the rectifying unit includes a first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode;
the anode of the first diode is respectively connected with the cathode of the second diode and the first of the power grid, the cathode of the first diode is respectively connected with the cathode of the third diode, the cathode of the fifth diode and the flyback unit, the anode of the third diode is respectively connected with the cathode of the fourth diode and the second of the power grid, the anode of the fifth diode is respectively connected with the cathode of the sixth diode and the third of the power grid, and the anode of the second diode is grounded with the anode of the fourth diode and the anode of the sixth diode.
In an alternative mode, the flyback unit comprises a first control chip, a first switching tube and a transformer, wherein the transformer comprises a first primary winding and at least one secondary winding;
the first control chip is connected with the first end of the first switch tube, the first power supply is connected with the first end of the first primary winding, the second end of the first primary winding is connected with the third end of the first switch tube, the second end of the first switch tube is grounded, and at least one secondary winding outputs at least one direct-current voltage, wherein one secondary winding of the at least one secondary winding outputs one direct-current voltage.
In an optional manner, the boost module includes a second control chip, a second switching tube and a first inductor;
the second control chip is connected with the first end of the second switching tube, the third end of the second switching tube is connected with the first direct current voltage through the first inductor, and the second end of the second switching tube is grounded.
In a second aspect, the present application provides an inverter comprising a PID repair circuit as described above.
In a third aspect, the present application provides a photovoltaic system comprising a photovoltaic module and an inverter as described above;
the inverter is connected between the power grid and the photovoltaic module.
The beneficial effects of this application are: the PID repair circuit comprises a preprocessing module, a control module and a boosting module. The power grid is connected with the pretreatment module, and the boosting module is respectively connected with the pretreatment module, the photovoltaic module and the control module. The preprocessing module is used for rectifying and converting voltage of an alternating current power supply of the power grid so as to output at least one direct current voltage. When the photovoltaic module stops running, the control module is used for outputting a first control signal to the boosting module. The boosting module responds to the first control signal to boost a first direct-current voltage in the at least one direct-current voltage and outputs the first voltage to the photovoltaic module so as to repair the PID effect of the photovoltaic module. By the mode, the PID effect of the photovoltaic module is repaired.
Drawings
One or more embodiments are illustrated by way of example and not limitation in the figures of the accompanying drawings, in which like references indicate similar elements, and in which the figures of the drawings are not to be taken in a limiting sense, unless otherwise indicated.
FIG. 1 is a schematic diagram of a PID repair circuit according to an embodiment of the present application;
FIG. 2 is a schematic diagram of a PID repair circuit according to another embodiment of the application;
FIG. 3 is a schematic diagram of a PID repair circuit according to another embodiment of the disclosure;
fig. 4 is a schematic circuit diagram of a level switching module according to an embodiment of the present disclosure;
fig. 5 is a schematic circuit diagram of a rectifying unit according to an embodiment of the present disclosure;
fig. 6 is a schematic circuit diagram of a flyback unit according to an embodiment of the present application;
fig. 7 is a schematic circuit diagram of a boost module according to an embodiment of the present application.
Detailed Description
For the purposes of making the objects, technical solutions and advantages of the embodiments of the present application more clear, the technical solutions of the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is apparent that the described embodiments are some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by one of ordinary skill in the art without undue burden from the present disclosure, are within the scope of the present disclosure.
Referring to fig. 1, fig. 1 is a schematic diagram of a PID repairing circuit 100 according to an embodiment of the present application. As shown in fig. 1, the PID repair circuit 100 includes a preprocessing module 10, a control module 20, and a boost module 30.
The pretreatment module 10 is connected with the power grid 200, the control module 20 is connected with the boosting module 30, and the boosting module 30 is also connected with the pretreatment module 10 and the photovoltaic module 300 respectively. Specifically, a first end of the pretreatment module 10 is connected with the power grid 200, a second end of the pretreatment module 10 is connected with a first end of the boost module 30, a second end of the boost module 30 is connected with the control module 20, and a third end of the boost module 30 is connected with the photovoltaic module 300.
The power grid 200 is a network formed by interconnecting a plurality of power systems, and the power transmission and distribution can be realized through the network. The power grid 200 includes different levels of power systems such as a high-voltage power transmission grid 200, a regional power distribution grid 200, and a consumer power grid 200. The power grid 200 is typically alternating current.
The photovoltaic module 300 is a device for converting solar rays into electric energy, and is composed of a plurality of photovoltaic panels. The photovoltaic cell panel adopts semiconductor materials, usually silicon, and converts solar energy into direct current electric energy through a photovoltaics principle. The photovoltaic panel is encapsulated in a protective enclosure, forming a photovoltaic module 300.
Specifically, the preprocessing module 10 is configured to rectify and convert voltage of the ac power source of the power grid 200 to output at least one dc voltage. The control module 20 is configured to output a first control signal to the boost module 30 when the photovoltaic module 300 stops operating. The boosting module 30 is configured to boost a first dc voltage of the at least one dc voltage in response to the first control signal, and output the first voltage to the photovoltaic module 300 to repair the PID effect of the photovoltaic module 300.
In practical applications, when the photovoltaic module 300 stops operating, for example, at a time when there is no sunlight at night, the photovoltaic module 300 stops operating and stops outputting the voltage. At this time, the control module 20 outputs a first control signal to the boost module 30. The boosting module 30 boosts a first direct current voltage among at least one direct current voltage outputted from the preprocessing module 10 in response to the first control signal. The first voltage is obtained after boosting and is input to the photovoltaic module 300 to apply a forward bias voltage to the positive and negative poles of the photovoltaic module 300, so that the PID effect of the photovoltaic module 300 can be repaired.
Secondly, in this embodiment, a mode of two-stage boosting is adopted by the preprocessing module 10 and the boosting module 30, on one hand, a high boosting ratio can be ensured to meet the voltage requirement of repairing the PID effect of the photovoltaic module 300; on the other hand, the number of coil turns that may be needed for the pretreatment module 10 can be reduced, so as to reduce the temperature rise of the pretreatment module 10 during operation, which is beneficial to improving the stability and reliability.
In an embodiment, the control module 20 is further configured to output a second control signal to the boost module 30 when the photovoltaic module 300 is operating. The boost module 30 is further configured to stop outputting the first voltage in response to the second control signal.
In this embodiment, the photovoltaic module 300 generally operates when there is the sun in the daytime and outputs a voltage. At this time, the control module 20 outputs a second control signal to the boost module 30. The boost module 30 stops outputting the first voltage.
In summary, the control module 20 controls the operation or stop operation of the boost module 30 by outputting the first control signal or the second control signal, so as to control the boost module 30 according to the actual situation of the photovoltaic module 300. Therefore, on the basis of repairing the PID effect of the photovoltaic module 300, the boosting module 30 can be prevented from affecting the normal operation of the photovoltaic module 300.
In one embodiment, the control module 20 is further configured to: the stored information is acquired and the current state of the photovoltaic module 300 is determined based on the stored information. Wherein the stored information includes at least one of current, voltage, and time. The current state of the photovoltaic module 300 includes a state in which the photovoltaic module 300 operates and a state in which the photovoltaic module stops operating.
Specifically, the current and voltage are the current and voltage input to the device in which the PID repair circuit 100 is located. For example, if the PID repair circuit 100 is an inverter, the current and voltage in the stored information are the current and voltage of the inverter. The current and the voltage can determine whether the photovoltaic module 300 is operating.
The time is set in the device where the PID repairing circuit 100 is located, and corresponds to the actual time. For example, if the device in which the PID repairing circuit 100 is located is an inverter, the time in the stored information is the time set in the inverter. By this time, it is possible to estimate whether the current time is daytime or evening, and further determine whether the photovoltaic module 300 is running.
In one embodiment, the current, voltage and time may be combined to determine the current status of the photovoltaic module 300. For example, when the current is less than a preset current threshold, the voltage is less than a preset voltage threshold, and the duration of the current being less than the preset current threshold and the voltage being less than the preset voltage threshold is greater than a preset duration, and the current moment is estimated to be at night by time, the photovoltaic module 300 can be judged to be in a shutdown state; conversely, when the current is greater than or equal to the preset current threshold, the voltage is greater than or equal to the preset voltage threshold, and the current is greater than or equal to the preset current threshold and the duration of the voltage greater than or equal to the preset voltage threshold is greater than the preset duration, and the current moment is estimated to be in the daytime by the time, the photovoltaic module 300 can be judged to be in the running state. It will be appreciated that this embodiment is merely illustrative of one way to determine the current state of the photovoltaic module 300, and in other embodiments, other ways may be used for determining, which embodiments of the present application are not limited in particular.
In this embodiment, the control module 20 can correspondingly output the first control signal or the second control signal based on the current state of the photovoltaic module 300 by determining the current state of the photovoltaic module 300, so as to repair the PID effect of the photovoltaic module 300 by the first voltage output by the voltage boosting module 30 on the premise that the voltage boosting module 30 does not affect the normal operation of the photovoltaic module 300.
In an embodiment, the at least one dc voltage further comprises a second dc voltage.
Wherein, when the photovoltaic module 300 stops operating, the second dc voltage supplies power to the control module 20. At this time, the preprocessing module 10 is further connected to the control module 20, and may provide the second dc voltage to the control module 20.
In practical applications, if the control module 20 needs to operate normally when the photovoltaic module 300 is operating, the control module 20 can be powered by the voltage output by the photovoltaic module 300. After the photovoltaic module 300 stops running, the control module 20 needs to be powered by the preprocessing module 10, so as to maintain the normal running of the control module 20, and realize the function of repairing the PID effect of the photovoltaic module 300.
In one embodiment, the at least one dc voltage further includes a third dc voltage that powers boost module 30.
In this embodiment, the first direct-current voltage output by the preprocessing module 10 is used as the voltage input by the boosting module 30, and the voltage is boosted to obtain the first voltage. The second dc voltage output by the preprocessing module 10 is used as the voltage for supplying power to the components in the boost module 30, so as to maintain the normal operation of the boost module 30.
In one embodiment, as shown in fig. 2, the preprocessing module 10 includes a rectifying unit 11 and a flyback unit 12.
The rectifying unit 11 is connected to the power grid 200, and the flyback unit 12 is connected to the rectifying unit 11. Specifically, a first end of the rectifying unit 11 is connected to the power grid 200, a second end of the rectifying unit 11 is connected to a first end of the flyback unit 12, a second end of the flyback unit 12 is connected to a first end of the boost module 30, and a third end of the flyback unit 12 is connected to the control module 20.
Specifically, the rectifying unit 11 is configured to rectify alternating current of the power grid 200 and output a first power source. The flyback unit 12 is configured to perform voltage conversion on the voltage of the first power source to output at least one dc voltage.
In this embodiment, since the boost module 30 is disposed subsequently, the number of turns of the coil needed to be used in the flyback unit 12 is smaller, which can reduce magnetic loss and reduce temperature rise of the flyback unit 12 during operation, and is beneficial to improving stability and reliability of PID repairing operation, so as to prolong the service life of the device (e.g. inverter) where the PID repairing circuit 100 is located.
It should be noted that the hardware configuration of the PID repair circuit 100 as shown in fig. 2 is only one example, and the PID repair circuit 100 may have more or less components than those shown in the drawing, may combine two or more components, or may have different component configurations, and various components shown in the drawing may be implemented in hardware, software, or a combination of hardware and software including one or more signal processing and/or application specific integrated circuits.
For example, as shown in FIG. 3, the PID repair circuit 100 also includes a level switching module 40. The level switching module 40 is connected to the voltage boosting module 30 and the photovoltaic module 300, respectively.
Specifically, the level switching module 40 is configured to output voltages of different levels to the photovoltaic module 300 based on the first voltage by changing the resistance value of the level switching module 40. That is, the level switching module 40 may change its resistance value according to the requirement of the photovoltaic module 300 to output a voltage corresponding to the requirement of the photovoltaic module 300 based on the first voltage. Therefore, the method can meet the voltage required by PID repair in an application scene, and has strong applicability and practicability.
Referring to fig. 4, one circuit configuration of the level switching module 40 is schematically shown in fig. 4. As shown in fig. 4, the level switching module 40 includes a first resistor R1, a second resistor R2, a third resistor R3, and a thyristor U5. The silicon controlled rectifier U5 comprises a light emitter and a light receiver.
Specifically, the first end of the first resistor R1 is connected to the boost module 30 and the first end of the second resistor R2, the first end of the second resistor R2 is connected to the first end of the light receiver, the second end of the light receiver is connected to the second end of the first resistor R1 and the first end of the third resistor R3, the first end of the light emitter is used for inputting a switching signal, and the second end of the light emitter is grounded.
In one embodiment, the level switching module 40 further includes a forty-first capacitor, a forty-first resistor, and a forty-second resistor. The specific connection manner of the above components may refer to fig. 4, and will not be described herein.
Wherein the eleventh capacitor is used for filtering. The forty-first resistor and the forty-second resistor are used for dividing the voltage of the switching signal, and can provide a conduction voltage drop for the light emitter.
In this embodiment, when the switching signal is a high level signal, the light emitter is powered on to emit light, and the light receiver is powered on to receive light. At this time, the resistor after the first resistor R1 and the second resistor R2 are connected in parallel is connected in series with the third resistor R3, and the voltage output to the photovoltaic module 300 by the level switching module 40 is: V1X (R3/(R1// r2+r3)), wherein V1 is a first voltage, and R1, R2 and R3 are the resistance values of the first resistor R1, the second resistor R2 and the third resistor R3 in sequence, and R1// R2 represents the resistance value of the first resistor R1 and the second resistor R2 after being connected in parallel.
When the switching signal is a low level signal, the light emitter is powered off to stop emitting light, and the light receiver is turned off. At this time, the second resistor R2 is connected in series with the third resistor R3, and the voltage output to the photovoltaic module 300 is: v1× (r 3/(r2+r3)).
In summary, the embodiment can output two different voltages based on the first voltage based on the different levels of the switching signals, so as to meet the requirements of two application scenarios.
It should be noted that, this embodiment only illustrates that two different voltages are output based on the first voltage, and in other embodiments, a manner of outputting more than two different voltages based on the first voltage may be designed with reference to fig. 4, which is within the scope of those skilled in the art and will not be repeated herein.
For example, in another embodiment, the same portion as the first resistor R1, the second resistor R2, the thyristor U5, the forty-first resistor and the forty-second resistor may be added, and the portion may be added between the portion of the first resistor R1, the second resistor R2, the thyristor U5, the forty-first resistor and the forty-second resistor and the portion of the third resistor R3 and the forty-first capacitor. In this way, four different voltages can be output based on the first voltage, and more application scenarios are applicable.
Referring to fig. 5, a circuit configuration of the rectifying unit 11 is exemplarily shown in fig. 5. As shown in fig. 5, the rectifying unit 11 includes a first diode D1, a second diode D2, a third diode D3, a fourth diode D4, a fifth diode D5, and a sixth diode D6.
The anode of the first diode D1 is connected to the cathode of the second diode D2 and the first of the power grid 200, the cathode of the first diode D1 is connected to the cathode of the third diode D3, the cathode of the fifth diode D5 and the flyback unit 12, the anode of the third diode D3 is connected to the cathode of the fourth diode D4 and the second of the power grid 200, the anode of the fifth diode D5 is connected to the cathode of the sixth diode D6 and the third of the power grid 200, and the anode of the second diode D2 is grounded to the anode of the fourth diode D4 and the anode of the sixth diode D6.
In an embodiment, the rectifying unit 11 further includes a first capacitor C1, a second capacitor C2, a third capacitor C3, a fourth capacitor C4, a fifth capacitor C5, a fourth resistor R4, a fifth resistor R5, a sixth resistor R6 and a seventh resistor R7. The specific connection manner of the above components may refer to fig. 5, and will not be described herein.
The first capacitor C1, the second capacitor C2, and the third capacitor C3 are used for filtering electromagnetic interference. The fourth resistor R4, the fifth resistor R5 and the sixth resistor R6 are used for current limiting. The fourth capacitor C4 and the fifth capacitor C5 are used for filtering.
In this embodiment, the power grid 200 is three-phase ac power, and the ac power can be converted into dc power by rectifying the first diode D1, the second diode D2, the third diode D3, the fourth diode D4, the fifth diode D5, and the sixth diode D6. By utilizing the unidirectional conductive property of the semiconductor diode, alternating currents of positive and negative half cycles are respectively conducted into different circuit channels, so that a direct current output with approximately constant voltage value is obtained. In addition, the embodiment adopts a full-wave rectification mode to fully utilize the voltage of each period to carry out rectification, so that the output efficiency is higher.
Referring to fig. 6, one circuit configuration of the flyback unit 12 is schematically shown in fig. 6. As shown in fig. 6, the flyback unit 12 includes a first control chip U1, a first switching tube Q1, and a transformer including a first primary winding L5 and at least one secondary winding.
The first control chip U1 is connected with a first end of the first switch tube Q1, the first power supply is connected with a first end of the first primary winding L5, a second end of the first primary winding L5 is connected with a third end of the first switch tube Q1, a second end of the first switch tube Q1 is grounded, and at least one secondary winding outputs at least one direct-current voltage, wherein one secondary winding of the at least one secondary winding outputs one direct-current voltage.
In this embodiment, the transformer includes three secondary windings, for example. The first secondary winding L2 is used for outputting a second direct voltage VC2, the second secondary winding L3 is used for outputting a third direct voltage VC3, and the third secondary winding L4 is used for outputting a first direct voltage VC1. Also, in this embodiment, the transformer further comprises a second primary winding L6. The second primary winding L6 is configured to output a voltage for supplying power to the first control chip U1.
In an embodiment, the flyback unit 12 further includes a sixth capacitor C6, a seventh capacitor C7, an eighth capacitor C8, a ninth capacitor C9, a tenth capacitor C10, an eleventh capacitor C11, a twelfth capacitor C12, a thirteenth capacitor C13, a fourteenth capacitor C14, a fifteenth capacitor C15, a sixteenth capacitor C16, a seventeenth capacitor C17, an eighteenth capacitor C18, a nineteenth capacitor C19, a twenty-first capacitor C20, a twenty-second capacitor C22, a twenty-third capacitor C23, a twenty-fourth capacitor C24, a twenty-fifth capacitor C25, a twenty-sixth capacitor C26, a twenty-seventh capacitor C27, a twenty-eighth capacitor C28, a twenty-ninth capacitor C29, an eighth resistor R8, a ninth resistor R9, a tenth resistor R10, an eleventh resistor R11, a twelfth resistor R12, a thirteenth resistor R13, a fourteenth resistor R14, a fifteenth resistor R15, a sixteenth resistor R16, a seventeenth resistor R17, an eighteenth resistor R18, a nineteenth resistor R19, a nineteenth resistor R21, a twenty-eighth diode R20, a twenty-eighth resistor R7, a twenty-eighth diode R7, a twenty-eighth resistor R8, a twenty-eighth diode R7, a twenty-eighth resistor R7. The specific connection manner of the components may refer to fig. 6, and will not be described herein.
The sixth capacitor C6, the seventh capacitor C7, the eighth resistor C8, the ninth resistor C9, the tenth resistor C10, and the seventh diode D7 are RCD clamp circuits. The eighth capacitor C8, the ninth capacitor C9, the tenth capacitor C10, the eleventh capacitor C11, the sixteenth resistor R16, the seventeenth resistor R17, the eighteenth resistor R18, and the second primary winding L6 are configured to output a voltage for supplying power to the first control chip U1.
In this embodiment, the first control chip U1 outputs a pulse width modulation (Pulse Width Modulation, PWM) signal to control the on and off of the first switching tube Q1. When the first switching tube Q1 is turned on, the first primary winding L5 is charged by the first power supply output by the rectifying unit 11; when the first switching tube Q1 is turned off, the first primary winding L5 stops charging, and the first secondary winding L2, the second secondary winding L3 and the third secondary winding L4 discharge based on the electric energy stored in the transformer, so as to output the first dc voltage VC1, the second dc voltage VC2 and the third dc voltage VC3, respectively.
In this embodiment, the first switching transistor Q1 is taken as an NMOS transistor as an example. The grid electrode of the NMOS tube is a first end of the first switching tube Q1, the source electrode of the NMOS tube is a second end of the first switching tube Q1, and the drain electrode of the NMOS tube is a third end of the first switching tube Q1.
In addition, the first switching transistor Q1 may be any controllable switch, such as an Insulated Gate Bipolar Transistor (IGBT) device, an Integrated Gate Commutated Thyristor (IGCT) device, a gate turn-off thyristor (GTO) device, a silicon controlled rectifier U5 (SCR) device, a junction gate field effect transistor (JFET) device, a MOS Controlled Thyristor (MCT) device, or the like.
Referring to fig. 7, one circuit configuration of the boost module 30 is schematically shown in fig. 7. As shown in fig. 7, the boost module 30 includes a second control chip U2, a second switching tube Q2, and a first inductor.
The second control chip U2 is connected with the first end of the second switching tube Q2, the third end of the second switching tube Q2 is connected with the first direct current voltage through an inductor, and the second end of the second switching tube Q2 is grounded.
In one embodiment, the boost module 30 further includes a twenty-sixth resistor R26, a twenty-seventh resistor R27, a twenty-eighth resistor R28, a twenty-ninth resistor R29, a thirty-sixth resistor R30, a thirty-first resistor R31, a thirty-second resistor R32, a thirty-third resistor R33, a thirty-fourth resistor R34, a thirty-fifth resistor R35, a thirty-sixth resistor R36, a thirty-seventh resistor R37, a thirty-eighth resistor R38, a thirty-ninth resistor R39, a forty-first resistor R40, a thirty-first capacitor C31, a thirty-second capacitor C32, a thirty-third capacitor C33, a thirty-fourth capacitor C34, a thirty-fifth capacitor C35, a thirty-sixth capacitor C36, a thirty-seventh capacitor C37, a thirty-eighth capacitor C38, a thirty-ninth capacitor C39, a fortieth capacitor C40, a first relay U3, and a second relay U4. The specific connection manner of the above components may refer to fig. 7, and will not be described herein.
In this embodiment, the second control chip U2 outputs a PWM signal to control the on and off of the second switching tube Q2. When the second switching tube Q2 is conducted, the first inductor is charged; when the second switching tube Q2 is turned off, the sum of the first dc voltage VC1 and the voltage on the first inductor is simultaneously output to the level switching module 40. Further, a boosting process is realized.
Since the boosting module 30 shown in fig. 7 can implement the boosting process, the number of turns of the transformer in the flyback unit 12 shown in fig. 6 can be reduced, and on the one hand, the magnetic loss can be reduced; on the other hand, the difference between the three dc voltages output by the flyback unit 12 can be reduced, so as to reduce the risk of mutual interference between the three dc voltages output by the flyback unit 12, thereby making the PID repair work more stable and prolonging the service lives of the PID repair circuit 100 and the photovoltaic module 300.
The embodiment of the application also provides an inverter. The inverter includes a PID repair circuit 100 in any of the embodiments of the present application.
The embodiment of the application also provides a photovoltaic system. The photovoltaic system comprises a photovoltaic module and an inverter in any embodiment of the application.
The inverter is connected between the power grid and the photovoltaic module. The inverter can realize PID repair of the photovoltaic module.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present application, and are not limiting thereof; the technical features of the above embodiments or in the different embodiments may also be combined under the idea of the present application, the steps may be implemented in any order, and there are many other variations of the different aspects of the present application as described above, which are not provided in details for the sake of brevity; although the present application has been described in detail with reference to the foregoing embodiments, it should be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the corresponding technical solutions from the scope of the technical solutions of the embodiments of the present application.
Claims (13)
1. A PID repair circuit, comprising:
the pretreatment module is connected with a power grid and used for rectifying and converting voltage of an alternating current power supply of the power grid so as to output at least one direct current voltage;
the control module is connected with the boosting module and is used for outputting a first control signal to the boosting module when the photovoltaic module stops running;
the boosting module is further connected with the preprocessing module and the photovoltaic module respectively, and is used for responding to the first control signal to boost a first direct current voltage in the at least one direct current voltage and outputting the first voltage to the photovoltaic module so as to repair the PID effect of the photovoltaic module.
2. The PID repair circuit of claim 1, wherein the control module is further configured to output a second control signal to the boost module when the photovoltaic module is operating;
the boost module is further configured to stop outputting the first voltage in response to the second control signal.
3. The PID repair circuit of claim 2, wherein the control module is further configured to: acquiring storage information, wherein the storage information comprises at least one of current, voltage and time;
and determining the current state of the photovoltaic module based on the stored information, wherein the current state of the photovoltaic module comprises the running state and the running stopping state of the photovoltaic module.
4. The PID repair circuit of claim 1, wherein the at least one dc voltage further comprises a second dc voltage;
and when the photovoltaic module stops running, the second direct-current voltage supplies power for the control module.
5. The PID repair circuit of claim 1, wherein the at least one dc voltage further comprises a third dc voltage, the third dc voltage powering the boost module.
6. The PID repair circuit of claim 1, further comprising a level switching module;
the level switching module is respectively connected with the boosting module and the photovoltaic module, and is used for outputting voltages with different levels to the photovoltaic module based on the first voltage by changing the resistance value of the level switching module.
7. The PID repair circuit of claim 6, wherein the level switching module comprises a first resistor, a second resistor, a third resistor, and a silicon controlled rectifier, wherein the silicon controlled rectifier comprises a light emitter and a light receiver;
the first end of the first resistor is connected with the boost module and the first end of the second resistor respectively, the first end of the second resistor is connected with the first end of the light receiver, the second end of the light receiver is connected with the second end of the first resistor and the first end of the third resistor respectively, the first end of the light emitter is used for inputting switching signals, and the second end of the light emitter is grounded.
8. The PID repair circuit of claim 1, wherein the preprocessing module comprises a rectifying unit and a flyback unit;
the rectification unit is connected with the power grid, and is used for rectifying alternating current of the power grid and outputting a first power supply;
the flyback unit is connected with the rectifying unit and is used for carrying out voltage conversion on the voltage of the first power supply so as to output the at least one direct-current voltage.
9. The PID repair circuit of claim 8, wherein the rectifying unit comprises a first diode, a second diode, a third diode, a fourth diode, a fifth diode and a sixth diode;
the anodes of the first diodes are respectively connected with the cathodes of the second diodes and the first of the power grid, the cathodes of the first diodes are respectively connected with the cathodes of the third diodes, the cathodes of the fifth diodes and the flyback unit, the anodes of the third diodes are respectively connected with the cathodes of the fourth diodes and the second of the power grid, the anodes of the fifth diodes are respectively connected with the cathodes of the sixth diodes and the third of the power grid, and the anodes of the second diodes are grounded with the anodes of the fourth diodes and the anodes of the sixth diodes.
10. The PID repair circuit of claim 8, wherein the flyback unit comprises a first control chip, a first switching tube and a transformer, the transformer comprising a first primary winding and at least one secondary winding;
the first control chip is connected with the first end of the first switch tube, the first power supply is connected with the first end of the first primary winding, the second end of the first primary winding is connected with the third end of the first switch tube, the second end of the first switch tube is grounded, and at least one secondary winding outputs at least one direct-current voltage, wherein one secondary winding of the at least one secondary winding outputs one direct-current voltage.
11. The PID repair circuit of claim 1, wherein the boost module comprises a second control chip, a second switching tube and a first inductor;
the second control chip is connected with the first end of the second switching tube, the third end of the second switching tube is connected with the first direct-current voltage through the first inductor, and the second end of the second switching tube is grounded.
12. An inverter comprising a PID repair circuit as claimed in any one of claims 1 to 11.
13. A photovoltaic system comprising a photovoltaic module and the inverter of claim 12;
the inverter is connected between the power grid and the photovoltaic module.
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| CN202310505088.1A CN116232216A (en) | 2023-05-08 | 2023-05-08 | PID repair circuit, inverter and photovoltaic system |
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| CN202310505088.1A CN116232216A (en) | 2023-05-08 | 2023-05-08 | PID repair circuit, inverter and photovoltaic system |
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