CN111245358B - Prevent electric potential induction decay device and voltage lifting system - Google Patents
Prevent electric potential induction decay device and voltage lifting system Download PDFInfo
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- CN111245358B CN111245358B CN202010157419.3A CN202010157419A CN111245358B CN 111245358 B CN111245358 B CN 111245358B CN 202010157419 A CN202010157419 A CN 202010157419A CN 111245358 B CN111245358 B CN 111245358B
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- 230000006698 induction Effects 0.000 title claims abstract description 21
- 238000005070 sampling Methods 0.000 claims abstract description 35
- 230000005669 field effect Effects 0.000 claims description 6
- 230000015556 catabolic process Effects 0.000 claims description 4
- 238000006731 degradation reaction Methods 0.000 claims description 4
- 230000002035 prolonged effect Effects 0.000 abstract description 2
- 238000010586 diagram Methods 0.000 description 22
- 230000002265 prevention Effects 0.000 description 8
- 230000001105 regulatory effect Effects 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000007935 neutral effect Effects 0.000 description 2
- 239000004065 semiconductor Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000033228 biological regulation Effects 0.000 description 1
- 239000003990 capacitor Substances 0.000 description 1
- 229910021419 crystalline silicon Inorganic materials 0.000 description 1
- 238000007599 discharging Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000011521 glass Substances 0.000 description 1
- 229910044991 metal oxide Inorganic materials 0.000 description 1
- 150000004706 metal oxides Chemical class 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 239000005022 packaging material Substances 0.000 description 1
- 238000002161 passivation Methods 0.000 description 1
- 230000008707 rearrangement Effects 0.000 description 1
- 238000006467 substitution reaction Methods 0.000 description 1
Classifications
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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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- 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
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
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Abstract
The embodiment of the invention discloses an anti-potential induction attenuation device and a voltage lifting system, wherein the anti-potential induction attenuation device is connected to an alternating current power grid connected with the output end of a converter of the voltage lifting system, and the device comprises: the sampling and control module is used for sampling the alternating current power grid voltage and generating a conduction execution command according to the alternating current power grid voltage; the grounding mode of the grounding module comprises at least one of direct grounding and indirect grounding, and the grounding module can output at least one preset potential; the potential selection module is connected between the power grid and the grounding module, and comprises a switch set, and the potential selection module is used for gating any phase of the alternating current power grid with the grounding module according to the conduction execution command. According to the technical scheme, any potential point of the power grid can be lifted, the PID attenuation problem of the photovoltaic cell panel is effectively solved, the service life of the photovoltaic module is prolonged, and the stable operation of the voltage lifting system is ensured.
Description
Technical Field
The embodiment of the invention relates to the technical field of power grids, in particular to a potential induction attenuation prevention device and a voltage lifting system.
Background
With the continuous development of new energy, the application of the crystalline silicon component is also becoming wider and wider. However, the components can generate potential induced decay (Potential Induced Degradation, PID) phenomenon under the action of high voltage for a long time: leakage current exists between the glass and the packaging material, a large amount of charges are accumulated on the surface of the battery piece, so that the passivation effect of the surface of the battery plate is deteriorated, and the Filling Factor (FF), the short-circuit current (Isc) and the open-circuit voltage (Voc) are reduced. Component performance is below design criteria and in severe cases it can cause a block of components to attenuate more than 50% of the power, thereby affecting the power output of the overall plant.
In order to solve the PID attenuation problem of the photovoltaic cell panel, the prior art can be divided into two directions, namely lifting the potential of the direct current side of the converter; the other is to raise the potential of the alternating current side of the converter; aiming at lifting the alternating-current side potential, the existing schemes can be divided into two schemes, and both schemes have defects. For the scheme I, an isolated power supply is used for lifting the virtual midpoint potential of an alternating current side, the scheme needs to use elements such as a resistor and a capacitor for virtual midpoint potential, and when the virtual midpoint potential is built in a resistor mode, the resistor has certain power consumption and can damage the generated energy; this must provide an additional dc isolated power supply, and during normal operation, the virtual midpoint potential is relatively high compared to ground potential, and the isolated power supply output voltage must also be high, which places higher demands on the power supply design. For the scheme II, the isolated power supply is used for lifting the negative electrode potential of the rectifier, and the scheme can overcome the defects in the scheme I, but the scheme needs to use more switching devices, comprises a rectifying part, and is not beneficial to the stable operation of equipment.
Disclosure of Invention
The embodiment of the invention provides a potential induction attenuation prevention device and a voltage lifting system, which are used for lifting any potential point of a power grid so as to effectively solve the PID attenuation problem of a photovoltaic cell panel, thereby prolonging the service life of a photovoltaic module and ensuring the stable operation of the system.
In a first aspect, an embodiment of the present invention provides an apparatus for preventing potential induced degradation, connected to an ac power grid connected to an output terminal of a current transformer of a voltage raising system, the apparatus including:
the sampling and control module is used for sampling alternating current grid voltage and generating a conduction execution command according to the alternating current grid voltage;
the grounding mode of the grounding module comprises at least one of direct grounding and indirect grounding, and the grounding module can output at least one preset potential;
the potential selection module is connected between the alternating current power grid and the grounding module, the potential selection module comprises a switch set, and the potential selection module is used for gating any phase of the alternating current power grid with the grounding module according to the conduction execution command.
Optionally, the sampling and control module includes:
the sampling unit is used for sampling a first phase voltage, a second phase voltage and a third phase voltage of the power grid;
and the control unit is used for locking the phases of the first phase voltage, the second phase voltage and the third phase voltage and generating a conduction execution command according to the locked phases.
Optionally, the switch set includes at least one switching device; the switching device directionally gates a phase voltage in the power grid according to the conduction execution command.
Optionally, the number of the switching devices is smaller than or equal to the number of phases of the power grid, a first end of each switching device is electrically connected with one phase which is controlled to be gated by the switching device, a second end of each switching device is electrically connected with the grounding module, and a control end of each switching device is electrically connected with the sampling and control module.
Optionally, the switching device includes an insulated gate field effect transistor, an insulated gate bipolar transistor, or a relay.
Optionally, the number of phases of the ac power grid conducted by the potential selecting module is one phase, two phases or three phases.
Optionally, the indirect grounding in the connection mode of the grounding module is grounding through impedance.
Optionally, the indirect grounding in the connection mode of the grounding module is grounding through a DC power supply.
Optionally, the DC power source comprises AC/DC, DC/DC adjustable power source or battery.
In a second aspect, an embodiment of the present invention provides a voltage lifting system, where the voltage lifting system includes a photovoltaic module, a converter, and a transformer, and further includes the anti-potential-induced attenuation device of any one of the first aspects; the input end of the current transformer is electrically connected with the output end of the photovoltaic array, and the output end of the current transformer is electrically connected with the input end of the transformer and the input end of the potential induction attenuation preventing device; and the output end of the transformer is connected with an alternating current power grid.
The embodiment of the invention provides an anti-potential induction attenuation device and a voltage lifting system, wherein the anti-potential induction attenuation device is connected to an alternating current power grid connected with the output end of a converter of the voltage lifting system, and the device comprises: the sampling and control module is used for sampling the alternating current power grid voltage and generating a conduction execution command according to the alternating current power grid voltage; the grounding mode of the grounding module comprises at least one of direct grounding and indirect grounding, and the grounding module can output at least one preset potential; the potential selection module is connected between the power grid and the grounding module, and comprises a switch set, and the potential selection module is used for gating any phase of the alternating current power grid with the grounding module according to a conduction execution command. According to the technical scheme, any potential point of the power grid can be lifted, the PID attenuation problem of the photovoltaic cell panel is effectively solved, the service life of the photovoltaic module is prolonged, and the stable operation of the system is ensured.
Drawings
FIG. 1 is a schematic diagram of a voltage boosting system according to an embodiment of the present invention;
FIG. 2 is a negative potential schematic diagram of a gated AC grid provided by an embodiment of the present invention;
FIG. 3 is a schematic diagram of a positive potential of a gated AC grid provided by an embodiment of the present invention;
fig. 4 is a schematic diagram of zero potential of a gated ac grid according to an embodiment of the present invention;
FIG. 5 is a schematic diagram of a potential induced attenuation preventing device according to an embodiment of the present invention;
FIG. 6 is a schematic diagram of another potential induced attenuation preventing device according to an embodiment of the present invention;
FIG. 7 is a schematic diagram of a device for preventing potential induced attenuation, in which a switching device is an insulated gate field effect transistor according to an embodiment of the present invention;
fig. 8 is a schematic structural diagram of an anti-potential-induced attenuation device with a switching device being an insulated gate bipolar transistor according to an embodiment of the present invention;
FIG. 9 is a schematic diagram of a potential induction attenuation preventing device with a switching device as a relay according to an embodiment of the present invention;
FIG. 10 is a schematic diagram of another potential induced attenuation preventing device according to an embodiment of the present invention;
FIG. 11 is a schematic diagram of another potential induced attenuation preventing device according to an embodiment of the present invention;
FIG. 12 is a schematic view of a grounding mode of a grounding module according to an embodiment of the present invention;
FIG. 13 is a schematic view of another grounding mode of the grounding module according to the embodiment of the present invention;
fig. 14 is a schematic view of another grounding mode of the grounding module according to the embodiment of the invention.
Detailed Description
The invention is described in further detail below with reference to the drawings and examples. It is to be understood that the specific embodiments described herein are merely illustrative of the invention and are not limiting thereof. It should be further noted that, for convenience of description, only some, but not all of the structures related to the present invention are shown in the drawings.
The embodiment of the invention provides a potential induction attenuation prevention device, and fig. 1 is a schematic diagram of a voltage lifting system provided by the embodiment of the invention, and reference is made to fig. 1; an anti-potential induced attenuation device 1 is connected to an ac power grid to which the output end of a converter 3 of a voltage raising system is connected, the device comprising:
the sampling and control module 10, the sampling and control module 10 is used for sampling the alternating current power grid voltage and generating a conduction execution command according to the alternating current power grid voltage;
the grounding module 20, the grounding mode of the grounding module 20 comprises at least one of direct grounding and indirect grounding, and the grounding module can output at least one preset potential;
the potential selection module 30 is connected between the ac power grid and the grounding module 20, the potential selection module 30 comprises a switch set, and the potential selection module 30 is used for gating any phase of the ac power grid with the grounding module 20 according to a conduction execution command.
Specifically, the anti-potential induction attenuation device 1 comprises a sampling and control module 10, a grounding module 20 and a potential selection module 30; wherein the potential selection module 30 is connected between the ac power grid and the grounding module 20. The ac power network connected therein is the ac power network 6 of the region between the converters 3 and 4. The sampling and control module 10 samples the voltage of the ac power grid 6 in real time, the sampled voltage of the ac power grid 6 may be the voltage between the power grids and/or the voltage of the power grid to the ground, and the voltage between the power grids and/or the voltage of the power grid to the ground is the line voltage and/or the phase voltage; the sampling and control module 10 is further configured to generate a turn-on execution command to turn on the potential selection module 30 when the sampled voltage vector of the ac power grid 6 is equal to the turn-on voltage vector set in advance by the sampling and control module 10; the conducting potential selecting module 30 comprises a switching device group, and the sampling and control module 10 realizes the gating of any phase of the alternating current power grid and the grounding module through the switching devices in the switching device group, so as to realize the forced clamping of the conducted alternating current power grid potential to the output potential of the grounding module 20; wherein the grounding mode of the grounding module 20 comprises at least one of direct grounding and indirect grounding, and the grounding module can output at least one preset potential. The potential induction attenuation preventing device 1 can achieve lifting of any grid potential point. By adjusting the reference potential given by the grounding module 20, the lifting amplitude of the alternating current power grid to the ground potential is further controlled.
Wherein the current transformer 3 is a non-isolated system. The intermediate potential of the positive electrode and the negative electrode of the photovoltaic module 1 in the voltage lifting system is equal to the potential of the neutral point of the three-phase power grid, so that the lifting amplitude of the alternating current power grid to the ground potential can be controlled by adjusting the reference potential given by the grounding module, the voltage of the neutral point of the three-phase power grid is changed, the potential of the photovoltaic module 2 in the voltage lifting system is indirectly lifted, and the PID influence is eliminated to improve the generating capacity of the photovoltaic power station; in the prior art, an isolated power supply is used for lifting the virtual midpoint potential of an alternating current side, the scheme needs to use resistance-capacitance elements and the like to virtually midpoint potential, when the virtual midpoint potential is built in a resistance mode, a resistor has certain power consumption, the generated energy is damaged, and the technical scheme of the embodiment of the invention avoids using the isolated power supply for lifting the virtual midpoint potential of the alternating current side and reduces the loss of electric quantity by arranging an anti-potential induced attenuation device; the potential induction attenuation prevention device only comprises a few switching devices, so that stable operation of the voltage lifting system is ensured.
In addition, fig. 2 is a negative potential schematic diagram of a gated ac power grid provided by an embodiment of the present invention, fig. 3 is a positive potential schematic diagram of a gated ac power grid provided by an embodiment of the present invention, fig. 4 is a zero potential schematic diagram of a gated ac power grid provided by an embodiment of the present invention, and refer to fig. 3 to 5; the potential corresponding to the voltage of the alternating current power grid 6 comprises negative potential, positive potential and zero potential, and the potential induction attenuation prevention device 1 gates different potentials of the alternating current power grid according to the type of the photovoltaic module 1 in the photovoltaic system; for example, when the photovoltaic module 2 is an N-type panel, the potential of the negative pole of the N-type panel to the ground needs to be gradually raised until the potential is greater than zero, so as to reduce the discharge of the negative pole of the N-type panel to the ground, and therefore, the negative potential of the ac power grid needs to be gated; when the photovoltaic module 2 is a P-type panel, the positive electrode of the P-type panel needs to be gradually reduced to be smaller than zero to reduce the positive electrode of the P-type panel from discharging to the ground, so that the positive potential of the alternating current power grid needs to be gated; the gating zero potential is suitable for two situations that the photovoltaic component is a P-type battery plate and an N-type battery plate. The on-time Δt of each switching device is not fixed and can be adjusted according to the amplitude requirement of the electrode of the photovoltaic module to the ground potential, typically less than 1ms.
Optionally, fig. 5 is a schematic structural diagram of an apparatus for preventing potential induced attenuation according to an embodiment of the present invention, and referring to fig. 5, fig. 1 to fig. 4 are combined; the sampling and control module 10 includes:
the sampling unit 11, the sampling unit 11 is used for sampling the first phase voltage, the second phase voltage and the third phase voltage of the power grid;
and a control unit 12, wherein the control unit 12 is used for locking the phases of the first phase voltage, the second phase voltage and the third phase voltage, and generating a conduction execution command according to the locked phases.
Specifically, the sampling and control module 10 includes a sampling unit 11 and a control unit 12; the three phases of the alternating current power grid comprise a first phase A, a second phase B and a third phase C; the sampling unit 11 samples a first phase voltage VA, a second phase voltage VB and a third phase voltage VC of the power grid through differential sampling and other methods; the control unit 12 is configured to lock phases of the first phase voltage VA, the second phase voltage VB, and the third phase voltage VC, and generate a turn-on execution command according to the locked phases. According to the locked phase, any voltage of the ac power grid can be gated, the control unit 12 comprises a DSP chip capable of implementing digital signal processing technology (Digital Signal Processing, DSP), and when the sampling unit 11 collects the first phase voltage VA, the second phase voltage VB and the third phase voltage VC of the power grid as voltages corresponding to the locked phase of the control unit 12, the control unit 12 generates a conduction execution command according to the phase of the corresponding ac power grid.
Optionally, fig. 6 is a schematic structural diagram of another potential induction attenuation preventing device according to an embodiment of the present invention, and refer to fig. 6; the switch bank comprises at least one switching device 31; the switching device 31 gates a phase voltage in the ac power grid oriented according to the turn-on execution command; the on execution command is a high-low level signal output by the control unit 12, and the switching device 31 adjusts its on state according to the high-low level signal, so as to gate the voltage of the corresponding phase in the ac power grid, thereby realizing the adjustment of the voltage of the phase in the ac power grid.
Optionally, fig. 7 is a schematic structural diagram of an anti-potential-induced attenuation device with a switching device being an insulated gate field effect transistor according to an embodiment of the present invention, fig. 8 is a schematic structural diagram of an anti-potential-induced attenuation device with a switching device being an insulated gate bipolar transistor according to an embodiment of the present invention, and fig. 9 is a schematic structural diagram of an anti-potential-induced attenuation device with a switching device being a relay according to an embodiment of the present invention, and refer to fig. 7 to fig. 9; the switching device is an insulated gate field effect transistor, an insulated gate bipolar transistor or a relay.
Specifically, the switching device may be an insulated gate field effect transistor, i.e., a metal-insulator-semiconductor (Metal Oxide Semiconductor, MOS) transistor, where the MOS transistor S1 controls conduction of the first phase a of the ac power grid, the MOS transistor S2 controls conduction of the second phase B of the ac power grid, and the MOS transistor S3 controls conduction of the third phase C of the ac power grid; the switching device may also be an insulated gate bipolar transistor (Insulated GateBipolar Transistor, IGBT), where K1 controls the conduction of the first phase a of the ac grid, K2 controls the conduction of the second phase B of the ac grid, and K3 controls the conduction of the third phase C of the ac grid; the switching device may also be a relay, wherein Q1 controls the conduction of the first phase a of the ac power grid, Q2 controls the conduction of the second phase B of the ac power grid, and Q3 controls the conduction of the third phase C of the ac power grid. The switching device may be capable of adjusting its conductive state according to the conductive execution command, and the embodiment of the present invention is not limited thereto.
Alternatively, referring to fig. 7-9, the number of switching devices is equal to the number of phases of the power grid, the first end of each switching device is connected to one of the switching devices that is controlled to be gated by the switching device, the second end of each switching device is electrically connected to the ground module, and the control end of each switching device is electrically connected to the sampling and control module. The control end of the switching device receives a conduction execution command generated by a control unit in the sampling and control module, the number of the switching devices is equal to the number of phases of the power grid, and one switching device correspondingly controls one-phase alternating current power grid to realize one-to-one targeted conduction of the alternating current power grid.
Alternatively, fig. 10 is a schematic structural diagram of another potential induction attenuation preventing device provided by the embodiment of the present invention, and fig. 11 is a schematic structural diagram of another potential induction attenuation preventing device provided by the embodiment of the present invention, referring to fig. 10 and 11, and referring to fig. 7; the number of phases of the alternating current power grid conducted by the potential selection module is one phase, two phases or three phases.
Specifically, the potential selecting module 30 changes the number of phases of the conductive ac power grid by changing the number of the set switching devices, and the number of phases of the conductive ac power grid of the potential selecting module 30 may be one phase, two phases or three phases; when only one switching device is arranged, only the phase of the alternating current power grid controlled by the switching device is selected, and the number of the phases of the alternating current power grid conducted by the potential selection module 30 is one phase; when two switching devices are arranged, only the phases of the alternating current power grid controlled by the switching devices are gated, and the number of the phases of the alternating current power grid conducted by the potential selection module 30 is two; when three switching devices are provided, the phases of all the ac power grids controlled by the switching devices can be gated, and the number of phases of the ac power grids conducted by the potential selection module 30 is three.
Alternatively, fig. 12 is a schematic view of a grounding form of a grounding module according to an embodiment of the present invention, fig. 13 is a schematic view of a grounding form of another grounding module according to an embodiment of the present invention, and fig. 14 is a schematic view of a grounding form of another grounding module according to an embodiment of the present invention, referring to fig. 12 to 14; the grounding module can be directly grounded, and the voltage output by the grounding module is the voltage of the grounding end. The indirect grounding in the connection mode of the grounding module can be grounding through impedance Z; the impedance Z is arranged to have the current limiting function and play a role in protecting the circuit. The indirect grounding in the connection mode of the grounding module is grounding through the DC power supply U. The DC power supply U is a direct current stabilized voltage power supply, and can convert 220V and 50Hz alternating current into direct current. The potential of the conducted alternating current power grid is forcedly clamped at the potential of direct current converted and output by the DC power supply, a stable reference potential is provided for the alternating current power grid, the lifting amplitude of the power grid to the ground potential is further controlled, the potential of the electrode pair ground of the battery plate group string in the photovoltaic module is indirectly regulated, and the PID influence is eliminated so as to improve the generating capacity of the photovoltaic power station.
Alternatively, the DC power source comprises an AC/DC, DC/DC adjustable power source or a battery. The DC power supply is sufficient to provide a stable reference potential for the ac power grid. For example, if the negative electrode of the battery plate group string in the photovoltaic module in the voltage lifting system needs to be lifted to the ground potential, the output voltage of the DC power supply is regulated to be greater than or equal to zero, the negative electrode of the battery plate group string in the photovoltaic module is regulated to be above 0 volt, and the PID influence is eliminated so as to improve the generated energy of the photovoltaic power station; if the positive electrode of the battery plate group string in the photovoltaic module in the photovoltaic system needs to be adjusted to the ground potential, the output voltage of the grounding module is changed to be negative, and the positive electrode of the battery plate group string can be adjusted to be lower than 0 volt, so that PID influence is eliminated, and the generating capacity of the photovoltaic power station is improved.
The embodiment of the invention also provides a voltage lifting system, and referring to FIG. 1; the voltage lifting system comprises a photovoltaic module 2, a converter 3 and a transformer 4, and further comprises the potential induction attenuation prevention device 1 in any embodiment; the input end of the current transformer 3 is electrically connected with the output end of the photovoltaic module 1, and the output end of the current transformer 3 is electrically connected with the input end of the transformer 4 and the input end of the potential induction attenuation prevention device 1; the output end of the transformer 4 is connected with an alternating current power grid 5.
The system can selectively lift any potential point of the power grid, realizes continuous adjustment of the power grid to the ground and the photovoltaic module to the ground voltage, and effectively solves the PID attenuation problem of the photovoltaic cell panel, thereby prolonging the service life of the photovoltaic module. Under the parallel operation scene of a plurality of converters, the voltage regulation of the input battery plate group string of all converters to the ground can be realized only by installing the PID prevention device at the alternating current output end of one converter.
Note that the above is only a preferred embodiment of the present invention and the technical principle applied. It will be understood by those skilled in the art that the present invention is not limited to the particular embodiments described herein, but is capable of various obvious changes, rearrangements and substitutions as will now become apparent to those skilled in the art without departing from the scope of the invention. Therefore, while the invention has been described in connection with the above embodiments, the invention is not limited to the embodiments, but may be embodied in many other equivalent forms without departing from the spirit or scope of the invention, which is set forth in the following claims.
Claims (9)
1. An apparatus for preventing potential induced degradation, the apparatus comprising:
the sampling and control module is used for sampling alternating current grid voltage and generating a conduction execution command according to the alternating current grid voltage;
the grounding mode of the grounding module comprises at least one of direct grounding and indirect grounding, and the grounding module can output at least one preset potential;
the potential selection module is connected between the alternating current power grid and the grounding module, and comprises a switch set, and is used for gating any phase of the alternating current power grid with the grounding module according to the conduction execution command;
the number of the switching devices in the switch set is equal to the number of phases of the alternating current power grid, the first end of each switching device is electrically connected with one phase which is controlled to be gated by the switching device, the second end of each switching device is electrically connected with the grounding module, and the control end of each switching device is electrically connected with the sampling and control module.
2. The apparatus of claim 1, wherein the sampling and control module comprises:
the sampling unit is used for sampling a first phase voltage, a second phase voltage and a third phase voltage of the power grid;
and the control unit is used for locking the phases of the first phase voltage, the second phase voltage and the third phase voltage and generating a conduction execution command according to the locked phases.
3. The apparatus of claim 1, wherein the switch bank comprises at least one switching device; the switching device directionally gates a phase voltage in the power grid according to the conduction execution command.
4. A potential-induced attenuation preventing apparatus according to claim 3, wherein the switching device comprises: insulated gate field effect transistors, insulated gate bipolar transistors or relays.
5. The device for preventing potential induced degradation according to claim 1, wherein the number of phases of the ac power grid conducted by the potential selecting module is one, two or three.
6. The apparatus of claim 1, wherein the indirect grounding in the connection of the grounding module is through impedance.
7. The apparatus of claim 1, wherein the indirect grounding in the connection of the grounding module is via a DC power supply.
8. The apparatus of claim 7, wherein the DC power source comprises an AC/DC, DC/DC adjustable power source or a battery.
9. A voltage lifting system, characterized in that the voltage lifting system comprises a photovoltaic module, a converter and a transformer, and further comprises the anti-potential induced attenuation device according to any one of claims 1-8; the input end of the current transformer is electrically connected with the output end of the photovoltaic module, and the output end of the current transformer is electrically connected with the input end of the transformer and the input end of the potential induction attenuation preventing device; and the output end of the transformer is connected with an alternating current power grid.
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| CN105932955A (en) * | 2016-06-03 | 2016-09-07 | 丰郅(上海)新能源科技有限公司 | Device for inhibiting potential induced degradation |
| CN106899036A (en) * | 2017-03-16 | 2017-06-27 | 特变电工西安电气科技有限公司 | A kind of photovoltaic generating system of anti-potential induction attenuation |
| CN108306612A (en) * | 2017-12-20 | 2018-07-20 | 华为技术有限公司 | A kind of photovoltaic module decaying restorative procedure in photovoltaic plant and device |
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2020
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105932955A (en) * | 2016-06-03 | 2016-09-07 | 丰郅(上海)新能源科技有限公司 | Device for inhibiting potential induced degradation |
| CN106899036A (en) * | 2017-03-16 | 2017-06-27 | 特变电工西安电气科技有限公司 | A kind of photovoltaic generating system of anti-potential induction attenuation |
| CN108306612A (en) * | 2017-12-20 | 2018-07-20 | 华为技术有限公司 | A kind of photovoltaic module decaying restorative procedure in photovoltaic plant and device |
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