CN107765094B - Photovoltaic cell board PID prosthetic devices - Google Patents
Photovoltaic cell board PID prosthetic devices Download PDFInfo
- Publication number
- CN107765094B CN107765094B CN201710952580.8A CN201710952580A CN107765094B CN 107765094 B CN107765094 B CN 107765094B CN 201710952580 A CN201710952580 A CN 201710952580A CN 107765094 B CN107765094 B CN 107765094B
- Authority
- CN
- China
- Prior art keywords
- branch
- positive
- negative
- photovoltaic
- power supply
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Active
Links
- 238000009413 insulation Methods 0.000 claims abstract description 24
- 230000007935 neutral effect Effects 0.000 claims abstract description 19
- 238000001514 detection method Methods 0.000 claims abstract description 18
- 238000002955 isolation Methods 0.000 claims description 51
- 238000005286 illumination Methods 0.000 claims description 8
- 239000004065 semiconductor Substances 0.000 claims description 6
- 238000000034 method Methods 0.000 description 8
- 238000010586 diagram Methods 0.000 description 7
- 230000015556 catabolic process Effects 0.000 description 3
- 238000006731 degradation reaction Methods 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 230000005540 biological transmission Effects 0.000 description 2
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000006698 induction Effects 0.000 description 1
- 230000000750 progressive effect Effects 0.000 description 1
- 229910052710 silicon Inorganic materials 0.000 description 1
- 239000010703 silicon Substances 0.000 description 1
- HBMJWWWQQXIZIP-UHFFFAOYSA-N silicon carbide Chemical compound [Si+]#[C-] HBMJWWWQQXIZIP-UHFFFAOYSA-N 0.000 description 1
- 229910010271 silicon carbide Inorganic materials 0.000 description 1
Images
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
- G01R27/025—Measuring very high resistances, e.g. isolation resistances, i.e. megohm-meters
-
- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01L—SEMICONDUCTOR DEVICES NOT COVERED BY CLASS H10
- H01L31/00—Semiconductor devices sensitive to infrared radiation, light, electromagnetic radiation of shorter wavelength or corpuscular radiation and specially adapted either for the conversion of the energy of such radiation into electrical energy or for the control of electrical energy by such radiation; Processes or apparatus specially adapted for the manufacture or treatment thereof or of parts thereof; Details thereof
- H01L31/18—Processes or apparatus specially adapted for the manufacture or treatment of these devices or of parts thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P70/00—Climate change mitigation technologies in the production process for final industrial or consumer products
- Y02P70/50—Manufacturing or production processes characterised by the final manufactured product
Landscapes
- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Condensed Matter Physics & Semiconductors (AREA)
- Electromagnetism (AREA)
- Computer Hardware Design (AREA)
- Microelectronics & Electronic Packaging (AREA)
- Power Engineering (AREA)
- Photovoltaic Devices (AREA)
- Prostheses (AREA)
Abstract
The invention provides a PID repairing device for a photovoltaic cell panel, wherein when preset conditions are met, isolating devices in an anode branch and a cathode branch are both in a conducting state, the potential of a connecting point (virtual neutral point) of the anode branch and the cathode branch is lifted through output electric energy of a direct-current power supply, and then the potentials of an anode and a cathode of each photovoltaic cell panel in a photovoltaic array are respectively lifted through the anode branch and the cathode branch, so that the PID repairing function is realized. Even if the path between the PID repairing device of the photovoltaic cell panel and the anode or the cathode of the photovoltaic array fails, the potential of the other electrode of the photovoltaic array can be ensured to be raised, and compared with the prior art, the reliability of PID repairing is improved. And moreover, the insulation impedance detection can be performed by controlling the on-off of the isolating device in the positive branch or the negative branch, an insulation detection circuit does not need to be additionally arranged, and the corresponding implementation cost is avoided.
Description
Technical Field
The invention relates to the technical field of power electronics, in particular to a photovoltaic cell panel PID repairing device.
Background
The PID effect (PotenTIal Induced DegradaTIon), also called PotenTIal Induced DegradaTIon, is a phenomenon of DegradaTIon of output characteristics of certain types of photovoltaic panels due to PotenTIal induction, which may cause a decrease in output power of a photovoltaic system; so it needs to be repaired by inverse PID technique.
The existing night inverse PID technology is an off-line inverse PID technology, a PID repair device of the technology is generally installed at the positive pole (or the negative pole) of a photovoltaic cell panel, and the potential of the photovoltaic cell panel to the ground is raised to be positive (or negative) by utilizing a positive bias power supply (or a negative bias power supply) at night.
However, the PID repair device in the prior art is mounted only on one of the positive electrode or the negative electrode of the photovoltaic cell panel, and if a fault occurs in the path between the PID repair device and the corresponding electrode of the photovoltaic cell panel, the PID repair function cannot be realized, which affects the reliability of PID repair. In addition, the PID repairing apparatus in the prior art needs an additional detection circuit when detecting the insulation resistance, which increases the implementation cost.
Disclosure of Invention
The invention provides a PID repairing device of a photovoltaic cell panel, which realizes the purpose of detecting insulation impedance with lower implementation cost and increases the working reliability of a PID repairing circuit.
In order to achieve the purpose, the technical scheme provided by the application is as follows:
a photovoltaic cell panel PID repair device is connected between a positive electrode and a negative electrode of a photovoltaic array; photovoltaic cell board PID prosthetic devices includes: the device comprises a positive branch, a negative branch and a direct current power supply; wherein:
the positive branch and the negative branch both include: an impedance element and an isolation device connected in series; the isolation device is in a conducting state when a preset condition is met;
one end of the positive pole branch is connected with the positive pole of the photovoltaic array;
one end of the negative branch is connected with the negative electrode of the photovoltaic array;
the other end of the positive pole branch circuit and the other end of the negative pole branch circuit are both connected with the positive pole of the direct current power supply;
and the negative electrode of the direct current power supply is grounded.
Preferably, when the photovoltaic array comprises N parallel strings and the inverter comprises M MPPT circuits, the number of the impedance elements and the isolation devices connected in series in the positive branch is M; n, M are all positive integers greater than 1;
in the positive pole branch, one ends of M impedance elements and isolating devices connected in series are respectively connected with the positive poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M paths of impedance elements and the isolating devices which are connected in series are connected with the anode of the power supply.
Preferably, when the photovoltaic array comprises N parallel strings and the inverter comprises M MPPT circuits, the number of the impedance elements in the positive branch is M; n, M are all positive integers greater than 1;
in the positive pole branch, one ends of M impedance elements are respectively connected with the positive poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected with the anode of the power supply through the same isolating device.
Preferably, when the photovoltaic array comprises N parallel strings and the inverter comprises M MPPT circuits, the number of the isolation devices in the positive branch is M; n, M are all positive integers greater than 1;
in the positive pole branch, one ends of M isolating devices are respectively connected with the positive poles of M MPPT circuits in a one-to-one correspondence manner; the other end of the M-path isolating device is connected with the anode of the power supply through the same impedance element.
Preferably, the number of the impedance elements and the isolation devices connected in series in the negative branch is M;
in the negative pole branch circuit, one ends of M impedance elements and isolating devices connected in series are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M paths of impedance elements and the isolating devices which are connected in series are connected with the anode of the direct current power supply.
Preferably, the number of the impedance elements in the negative branch is M;
in the negative pole branch circuit, one ends of M impedance elements are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected with the anode of the direct current power supply through the same isolation device.
Preferably, the number of the isolation devices in the negative branch is M;
in the negative pole branch, one ends of M isolating devices are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M isolating devices are connected with the anode of the direct current power supply through the same impedance element.
Preferably, the method further comprises the following steps: the insulation resistance detection unit is connected between the positive pole of the direct current power supply and the ground and is used for detecting the insulation resistance of the positive pole branch and the negative pole branch to the ground;
the insulation resistance detection unit includes: a switching element and an impedance element connected in series.
Preferably, the impedance element is: a resistor or an inductor, or a series-parallel connection form of the resistor and the inductor;
the isolation device is as follows: any one of a relay, a contactor, and a semiconductor device, or a series-parallel form of at least two of the relay, the contactor, and the semiconductor device.
Preferably, the preset conditions are as follows:
the time reaches the preset time;
or the illumination is lower than the preset illumination;
or, the voltage of the direct current bus of the photovoltaic array is lower than a preset voltage value.
The photovoltaic cell panel PID repairing device provided by the invention is connected with the anode of a photovoltaic array through one end of an anode branch; one end of the negative branch is connected with the negative electrode of the photovoltaic array; the other end of the positive pole branch and the other end of the negative pole branch are both connected with the positive pole of the direct current power supply; when the preset conditions are met, the isolating devices in the positive branch and the negative branch are both in a conducting state, the potential of a connecting point of the positive branch and the negative branch is lifted through the output electric energy of the direct-current power supply, namely after the potential of the virtual neutral point, the potentials of the positive pole and the negative pole of each photovoltaic cell panel in the photovoltaic array are respectively lifted through the positive branch and the negative pole branch, and the PID repairing function is achieved. In addition, the process of lifting the electric potentials of the anode and the cathode of each photovoltaic cell panel by lifting the electric potential of the virtual neutral point can ensure that the electric potential of the other electrode of the photovoltaic array is lifted even when a fault occurs in a path between the PID repairing device of the photovoltaic cell panel and the anode or the cathode of the photovoltaic array, and compared with the prior art, the reliability of PID repairing is improved. And moreover, the insulation impedance detection can be performed by controlling the on-off of the isolating device in the positive branch or the negative branch, an insulation detection circuit does not need to be additionally arranged, and the corresponding implementation cost is avoided.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
Fig. 1 is a schematic structural diagram of a photovoltaic cell panel PID repairing apparatus provided in an embodiment of the present invention;
FIG. 2 is a schematic circuit diagram of a photovoltaic panel PID repair apparatus provided by an embodiment of the invention;
fig. 3 is a schematic circuit diagram of a photovoltaic panel PID repairing apparatus provided by an embodiment of the present invention;
fig. 4 is a schematic structural diagram of a photovoltaic panel PID repairing apparatus according to another embodiment of the present invention;
fig. 5 is a schematic structural diagram of a photovoltaic panel PID repairing apparatus according to another embodiment of the present invention;
fig. 6 is a schematic structural diagram of a photovoltaic panel PID repairing apparatus according to another embodiment of the present invention;
fig. 7 is a schematic structural diagram of a photovoltaic panel PID repairing apparatus according to another embodiment of the present invention.
Detailed Description
The technical solutions in 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 obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.
The invention provides a photovoltaic cell panel PID repairing device, which aims to solve the problem that in the prior art, the PID repairing function cannot be realized when a passage between the photovoltaic cell panel and a corresponding pole of the photovoltaic cell panel is in fault, so that the ID repairing reliability is low.
Referring to fig. 1, the photovoltaic cell panel PID repairing apparatus is connected between the positive electrode and the negative electrode of the photovoltaic array; specifically, this photovoltaic cell board PID prosthetic devices includes: a positive branch 101, a negative branch 102 and a dc power supply 103; wherein:
the positive arm 101 and the negative arm 102 each include: an impedance element and an isolation device connected in series; the isolation device is in a conducting state when meeting a preset condition;
one end of the positive branch 101 is connected with the positive electrode of the photovoltaic array;
one end of the negative branch 102 is connected with the negative electrode of the photovoltaic array;
the other end of the positive branch 101 and the other end of the negative branch 102 are both connected with the positive pole of the direct current power supply 103;
the negative pole of the dc power supply 103 is grounded.
Preferably, the impedance element is: a resistor (as shown in fig. 3) or an inductor (as shown in fig. 2), or a series-parallel connection of a resistor and an inductor. In a specific practical application, the impedance value of the impedance element ranges from 0 to infinity, which may be determined by the specific circumstances and is within the scope of the present application.
Preferably, the isolation device is: any one of a relay, a contactor and a semiconductor device (such as a diode, a thyristor, a MOSFET, an IGBT, a silicon carbide device, etc.), or a series-parallel connection form of at least two of the relay, the contactor and the semiconductor device.
Preferably, the preset conditions are:
the time reaches the preset time;
or the illumination is lower than the preset illumination;
or, the voltage of the direct current bus of the photovoltaic array is lower than the preset voltage value.
It should be noted that, when the isolation device is a controllable device, such as a silicon controlled rectifier, a MOSFET, an IGBT, a relay (as shown in fig. 2) or a contactor, a control terminal of the isolation device receives a control signal, which is specifically a signal for controlling the corresponding isolation device to be turned on when the preset condition is satisfied; and the control signal may be derived from a controller in the photovoltaic system inverter, or may be derived from other controllers, and is not specifically limited herein, and is within the protection scope of the present application depending on the specific environment. When the isolation device is a diode (as shown in fig. 3), the preset condition is that the dc bus voltage of the photovoltaic array is lower than the preset voltage value, and at this time, the output voltage of the dc power supply 103 is higher than the dc bus voltage of the photovoltaic array, so as to output electric energy to the positive electrode and the negative electrode of the photovoltaic array.
The specific working principle is as follows:
when any one of the preset conditions is met, for example, when the illumination is lower than the preset illumination, that is, at night, the isolating devices in the positive branch 101 and the negative branch 102 will be in a conducting state, and after the output electric energy of the dc power supply 103 raises the potential of the connection point between the positive branch 101 and the negative branch 102, that is, the potential of the virtual neutral point, the potentials of the positive electrode and the negative electrode of each photovoltaic cell panel in the photovoltaic array are respectively raised through the positive branch 101 and the negative branch 102, so as to implement the PID repairing function. During the day, the photovoltaic system inverter will work normally, and the isolation devices in the positive branch 101 and the negative branch 102 will be in the off state, and the photovoltaic panel PID repair device will not work.
According to the photovoltaic cell panel PID repairing device provided by the embodiment, because the internal impedance of the photovoltaic cell panel is close to 0 at night, when the potential of the virtual neutral point is lifted, the potentials of the anode and the cathode of the photovoltaic cell panel are lifted equivalently. This process of the electric potential lifting of positive pole and the negative pole of each photovoltaic cell board is realized through the electric potential of lifting virtual neutral point, even if when the route between this photovoltaic cell board PID prosthetic devices and the positive pole of photovoltaic array or negative pole breaks down, also can guarantee that another pole electric potential of photovoltaic array is lifted, compares prior art and has improved the prosthetic reliability of PID. And this photovoltaic cell board PID prosthetic devices that this embodiment provided only needs corresponding DC power supply, impedance element and isolating device can, and the device realizes with low costsly.
In addition, according to the PID repairing apparatus for a photovoltaic cell panel provided by this embodiment, the on-off of the isolation apparatus in the positive branch 101 or the negative branch 102 is controlled, so that the detection function of the insulation resistance to ground of the positive branch 101 and the negative branch 102 can be realized. Assuming that the isolation devices in the positive branch 101 and the negative branch 102 are both turned on, the photovoltaic array has a ground potential of UpV1Neutral point to ground potential Uo1(ii) a When the isolating device in the positive branch 101 or the negative branch 102 is disconnected, the ground potential of the photovoltaic array is UpV2Neutral point to ground potential Uo2The impedances of the impedance elements in the positive branch 101 and the negative branch 102 are both Z; then:
because the impedance Z is a known quantity, the insulation impedance to ground of the positive branch 101 and the negative branch 102 can be obtained through the detection of the neutral point and the ground potential of the positive pole of the photovoltaic array. That is, the insulation resistance detection is performed by controlling the on/off of the isolation device in the positive branch 101 or the negative branch 102, and an insulation detection circuit does not need to be additionally arranged, so that the corresponding implementation cost is avoided.
Another embodiment of the present invention further provides a specific photovoltaic panel PID repairing apparatus, where in a photovoltaic system to which the photovoltaic array includes N parallel strings and the inverter includes M MPPT circuits, on the basis of the foregoing embodiment and fig. 1 to 3, preferably, refer to fig. 4, fig. 5 or fig. 6; referring to fig. 4, the number of impedance elements and isolation devices connected in series in the positive branch 101 is M; n, M are all positive integers greater than 1;
in the positive pole branch 101, one ends of the M impedance elements and the isolation devices connected in series are respectively connected with the positive poles of the M MPPT circuits in a one-to-one correspondence manner; the other ends of the M series-connected impedance elements and the isolation devices are connected to the positive electrode of the dc power supply 103.
Alternatively, referring to fig. 5, the number of impedance elements in the positive branch 101 is M;
in the positive pole branch 101, one ends of the M impedance elements are respectively connected with the positive poles of the M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected to the positive electrode of the dc power supply 103 through the same isolation device.
Alternatively, referring to fig. 6, the number of the isolation devices in the positive branch 101 is M;
in the positive pole branch 101, one ends of the M isolating devices are respectively connected with the positive poles of the M MPPT circuits in a one-to-one correspondence manner; the other ends of the M isolation devices are connected to the positive electrode of the dc power supply 103 through the same impedance element.
In addition to fig. 4, 5, or 6, it is preferable that the number of impedance elements and isolation devices connected in series in the negative arm 102 is M;
in the negative pole branch 102, one ends of the impedance elements and the isolating devices which are connected in series are respectively connected with the negative poles of the M MPPT circuits in a one-to-one correspondence manner; the other ends of the M series-connected impedance elements and the isolation devices are connected to the positive electrode of the dc power supply 103.
Alternatively, on the basis of fig. 4, fig. 5 or fig. 6, it is preferable that the number of the impedance elements in the negative branch 102 is M;
in the negative pole branch 102, one ends of M impedance elements are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected to the positive electrode of the dc power supply 103 through the same isolation device.
Or, on the basis of fig. 4, fig. 5 or fig. 6, preferably, the number of the isolation devices in the negative branch 102 is M;
in the negative pole branch 102, one ends of M isolating devices are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected to the positive electrode of the dc power supply 103 through the same impedance element.
FIG. 4 is a PID implementation of virtual neutral potential boost based MPPT with multiple MPPT inverters, each MPPT (MPPT1, MPPT2 … MPPT) circuit having a series impedance element and an isolator between its positive pole and the virtual neutral. And a path of isolation device and impedance element connected in series can be separately arranged between the negative electrode of each path of MPPT circuit and the virtual neutral point, or a single impedance element is separately arranged, or M paths of isolation device and impedance element connected in series, M isolation devices and an impedance element, M impedance elements and an isolation device are arranged, which are not shown in fig. 4.
FIG. 5 is another implementation of a virtual neutral potential boost based PID repair with multiple MPPT inverters, with an impedance element disposed between the positive pole of each MPPT (MPPT1, MPPT2 … MPPT) circuit and the virtual neutral, but with a common isolation device. And a path of isolation device and impedance element connected in series can be independently arranged between the negative electrode of each path of MPPT circuit and the virtual neutral point, or an impedance element is independently arranged, or M paths of isolation device and impedance element connected in series, M isolation devices and an impedance element, M impedance elements and an isolation device are arranged, which are not shown in fig. 5.
FIG. 6 is another implementation of a virtual neutral potential boost based PID repair with multiple MPPT inverters, with an isolation device disposed between the positive pole of each MPPT (MPPT1, MPPT2 … MPPT) circuit and the virtual neutral, but with impedance elements in common. And a path of isolation device and impedance element connected in series can be independently arranged between the negative electrode of each path of MPPT circuit and the virtual neutral point, or an impedance element is independently arranged, or M paths of isolation device and impedance element connected in series, M isolation devices and an impedance element, M impedance elements and an isolation device are arranged, which are not shown in fig. 6.
When the photovoltaic array comprises N parallel strings connected with M MPPT circuits (the connection relationship may be determined according to the specific application environment), unlike fig. 1 to 3, the positive branch 101 of the photovoltaic cell panel PID repairing apparatus in fig. 4 and 5 is divided into a plurality of branches, and is connected with the positive electrodes of the MPPT circuits one by one; and a transmission line between the direct-current power supply 103 and the positive pole of each group string is increased, so that the reliability of electric energy transmission is improved. The principle of dividing the negative branch 102 into multiple branches is the same, and the description thereof is omitted.
The rest of the working principle is the same as the above embodiment, and is not described in detail here.
Another embodiment of the present invention further provides a specific photovoltaic panel PID repairing apparatus, based on the above embodiment and fig. 1 to 6, preferably, referring to fig. 7, further including: and an insulation resistance detection unit 104 connected between the positive electrode and the negative electrode of the dc power supply 103, for detecting the insulation resistance to ground of the positive electrode branch 101 and the negative electrode branch 102.
Preferably, referring to fig. 7, the insulation resistance detecting unit 104 includes: a switching element SW1 and an impedance element Z connected in series.
Fig. 7 is a PID repair implementation based on virtual neutral potential rise and equipped with insulation resistance detection function by adding extra circuit. The output end of the DC power supply 103 is connected in parallel with an insulation resistance detection unit. When the insulation resistance to the ground of the positive branch 101 and the negative branch 102 is detected, the insulation resistance of the photovoltaic cell panel PID repair device is calculated through the ground potential of the positive electrode or the negative electrode of the photovoltaic array in two states of the on state and the off state of the switch of the detection element SW 1.
The rest of the working principle is the same as the above embodiment, and is not described in detail here.
The embodiments of the invention are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments can be referred to each other. The device disclosed by the embodiment corresponds to the method disclosed by the embodiment, so that the description is simple, and the relevant points can be referred to the method part for description.
The foregoing is merely a preferred embodiment of the invention and is not intended to limit the invention in any manner. Although the present invention has been described with reference to the preferred embodiments, it is not intended to be limited thereto. Those skilled in the art can make numerous possible variations and modifications to the present teachings, or modify equivalent embodiments to equivalent variations, without departing from the scope of the present teachings, using the methods and techniques disclosed above. Therefore, any simple modification, equivalent change and modification made to the above embodiments according to the technical essence of the present invention are still within the scope of the protection of the technical solution of the present invention, unless the contents of the technical solution of the present invention are departed.
Claims (10)
1. A photovoltaic cell panel PID repair device is characterized by being connected between a positive electrode and a negative electrode of a photovoltaic array; photovoltaic cell board PID prosthetic devices includes: the device comprises a positive branch, a negative branch and a direct current power supply; wherein:
the positive branch and the negative branch both include: an impedance element and an isolation device connected in series; the isolation device is in a conducting state when a preset condition is met;
the detection function of the ground insulation impedance of the positive branch and the negative branch is realized by controlling the on-off of the isolating device;
one end of the positive pole branch is connected with the positive pole of the photovoltaic array;
one end of the negative branch is connected with the negative electrode of the photovoltaic array;
the other end of the positive pole branch circuit is connected with the other end of the negative pole branch circuit, and a connection point is used as a virtual neutral point and is connected with the positive pole of the direct current power supply;
the negative electrode of the direct current power supply is grounded;
and the potential of the positive electrode and the negative electrode of each photovoltaic cell panel is raised by raising the potential of the virtual neutral point.
2. The photovoltaic panel PID repair device of claim 1, wherein when the photovoltaic array includes N parallel strings and the inverter includes M MPPT circuits, the number of impedance elements and isolation devices connected in series in the positive branch is M; n, M are all positive integers greater than 1;
in the positive pole branch, one ends of M impedance elements and isolating devices connected in series are respectively connected with the positive poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M paths of impedance elements and the isolating devices which are connected in series are connected with the anode of the direct current power supply.
3. The photovoltaic panel PID repair device according to claim 1, characterized in that when the photovoltaic array comprises N parallel strings and the inverter comprises M MPPT circuits, the number of impedance elements in the positive branch is M; n, M are all positive integers greater than 1;
in the positive pole branch, one ends of M impedance elements are respectively connected with the positive poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected with the anode of the direct current power supply through the same isolation device.
4. The photovoltaic panel PID repair device of claim 1, wherein when the photovoltaic array includes N parallel strings and the inverter includes M MPPT circuits, the number of the isolators in the positive branch is M; n, M are all positive integers greater than 1;
in the positive pole branch, one ends of M isolating devices are respectively connected with the positive poles of M MPPT circuits in a one-to-one correspondence manner; the other end of the M-path isolating device is connected with the anode of the direct-current power supply through the same impedance element.
5. The photovoltaic panel PID repair device of any one of claims 2 to 4, wherein the number of impedance elements and isolation devices connected in series in the negative branch is M;
in the negative pole branch circuit, one ends of M impedance elements and isolating devices connected in series are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M paths of impedance elements and the isolating devices which are connected in series are connected with the anode of the direct current power supply.
6. The photovoltaic panel PID repair device of any one of claims 2 to 4, wherein the number of impedance elements in the negative branch is M;
in the negative pole branch circuit, one ends of M impedance elements are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M impedance elements are connected with the anode of the direct current power supply through the same isolation device.
7. The photovoltaic panel PID repair device of any one of claims 2 to 4, wherein the number of the isolation devices in the negative branch is M;
in the negative pole branch, one ends of M isolating devices are respectively connected with the negative poles of M MPPT circuits in a one-to-one correspondence manner; the other ends of the M isolating devices are connected with the anode of the direct current power supply through the same impedance element.
8. The photovoltaic panel PID repair device according to claim 1, further comprising: the insulation resistance detection unit is connected between the positive pole of the direct current power supply and the ground and is used for detecting the insulation resistance of the positive pole branch and the negative pole branch to the ground;
the insulation resistance detection unit includes: a switching element and an impedance element connected in series.
9. The photovoltaic panel PID repair device according to claim 1, characterized in that the impedance elements are: a resistor or an inductor, or a series-parallel connection form of the resistor and the inductor;
the isolation device is as follows: any one of a relay, a contactor, and a semiconductor device, or a series-parallel form of at least two of the relay, the contactor, and the semiconductor device.
10. The photovoltaic panel PID repair apparatus of claim 1, wherein the preset conditions are:
the time reaches the preset time;
or the illumination is lower than the preset illumination;
or, the voltage of the direct current bus of the photovoltaic array is lower than a preset voltage value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710952580.8A CN107765094B (en) | 2017-10-13 | 2017-10-13 | Photovoltaic cell board PID prosthetic devices |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201710952580.8A CN107765094B (en) | 2017-10-13 | 2017-10-13 | Photovoltaic cell board PID prosthetic devices |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN107765094A CN107765094A (en) | 2018-03-06 |
| CN107765094B true CN107765094B (en) | 2021-02-12 |
Family
ID=61269334
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710952580.8A Active CN107765094B (en) | 2017-10-13 | 2017-10-13 | Photovoltaic cell board PID prosthetic devices |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN107765094B (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN111800085A (en) * | 2020-07-27 | 2020-10-20 | 珠海格力电器股份有限公司 | Photovoltaic system PID effect repairing method and device and photovoltaic system |
| ES2874849B2 (en) * | 2021-06-15 | 2022-02-11 | Univ Madrid Politecnica | SYSTEM AND METHOD FOR LOCATION OF BRANCH WITH EARTH FAULT IN DIRECT CURRENT ELECTRICAL SYSTEMS WITH SEVERAL PARALLEL BRANCHES |
Family Cites Families (12)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102798760B (en) * | 2012-08-16 | 2015-05-20 | 阳光电源股份有限公司 | Method and circuit fir detecting ground insulation impedance of photovoltaic array |
| CN103475271B (en) * | 2013-09-24 | 2016-04-27 | 深圳市禾望电气股份有限公司 | A kind of photovoltaic generating system and control method thereof |
| CN104201983A (en) * | 2014-09-23 | 2014-12-10 | 阳光电源股份有限公司 | Device for lowering potential induction decay |
| CN104242349B (en) * | 2014-10-10 | 2016-09-21 | 阳光电源股份有限公司 | The photovoltaic system of anti-potential induction attenuation and photovoltaic DC-to-AC converter |
| CN104467018B (en) * | 2014-12-24 | 2017-10-31 | 北京格林科电技术有限公司 | It is a kind of to protect photovoltaic module to suppress to eliminate the method and device of PID phenomenons |
| CN105720907B (en) * | 2016-01-25 | 2018-02-23 | 南京科远自动化集团股份有限公司 | A kind of method and device for being used in inverter suppress photovoltaic module PID effects |
| CN205961054U (en) * | 2016-08-10 | 2017-02-15 | 上能电气股份有限公司 | A device that is arranged in photovoltaic system to eliminate panel PID effect |
| CN206099881U (en) * | 2016-08-18 | 2017-04-12 | 特变电工西安电气科技有限公司 | Device that restraines photovoltaic cell board PID effect |
| CN106160651B (en) * | 2016-08-18 | 2018-12-11 | 特变电工西安电气科技有限公司 | A kind of system inhibiting photovoltaic battery panel PID effect |
| CN106505611A (en) * | 2016-10-21 | 2017-03-15 | 上能电气股份有限公司 | A kind of back-emf induced attenuation control device |
| CN206164112U (en) * | 2016-11-01 | 2017-05-10 | 华能国际电力股份有限公司浙江清洁能源分公司 | A attenuating device is inductiond to anti current potential for photovoltaic power generation system |
| CN106505626B (en) * | 2016-12-21 | 2019-04-09 | 阳光电源股份有限公司 | A kind of photovoltaic inverting system and its PID effect compensation method and device |
-
2017
- 2017-10-13 CN CN201710952580.8A patent/CN107765094B/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN107765094A (en) | 2018-03-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| US9923517B1 (en) | Photovoltaic inverter system, potential induced degradation effect compensation method and device for the same | |
| CN102640375B (en) | Inverter for high voltages | |
| EP3171476B1 (en) | Mmc-hvdc system, and direct-current side isolation device and isolation method therefor | |
| CN103825299A (en) | Grid-connected photovoltaic power generation system and control method thereof | |
| CN106602504A (en) | Photovoltaic rapid turn-off device and photovoltaic system | |
| CN104242349B (en) | The photovoltaic system of anti-potential induction attenuation and photovoltaic DC-to-AC converter | |
| WO2016107616A1 (en) | Apparatus for preventing capacitance overvoltage in voltage-source type inverter | |
| CN212543724U (en) | PID effect suppression device and photovoltaic power generation system | |
| CN106603007B (en) | Photovoltaic array ground insulation impedance detection circuit | |
| CN104333213A (en) | Protecting method for output overvoltage of PV array, device and system | |
| CN103983855A (en) | Method and circuit for detecting insulation resistance | |
| CN115276549B (en) | PID effect suppression system | |
| CN107765094B (en) | Photovoltaic cell board PID prosthetic devices | |
| WO2022057480A1 (en) | Repair and suppression device for pid effect of photovoltaic power generation system | |
| CN104065285A (en) | Grid-connected inverter system | |
| CN103887767A (en) | Device for protection against an electrical overcurrent of at least one electronic switching branch, conversion system comprising such a protection device, and related control method | |
| CN207541158U (en) | A kind of PID prevention prosthetic devices of photovoltaic battery panel | |
| CN112103925A (en) | Multi-port hybrid direct-current circuit breaker and control method | |
| CN204244167U (en) | Anti-PID device in a kind of many level photovoltaic generating system | |
| CN201804798U (en) | A relay | |
| CN109617126A (en) | A kind of novel anti-PID device | |
| CN203734325U (en) | Photovoltaic grid-connected power generation system | |
| CN105515513A (en) | Photovoltaic inverter and control method thereof | |
| US9716445B2 (en) | Inverter grid-connected system and method for implementing three-phase alternating current grid-connected transition | |
| CN102106075A (en) | Control method for using redundancy in case of a disturbance in a multiphase converter having distributed energy stores |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |