CN107492905B - Alternating current common mode voltage adjusting device and photovoltaic system applying same - Google Patents
Alternating current common mode voltage adjusting device and photovoltaic system applying same Download PDFInfo
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- CN107492905B CN107492905B CN201710722992.2A CN201710722992A CN107492905B CN 107492905 B CN107492905 B CN 107492905B CN 201710722992 A CN201710722992 A CN 201710722992A CN 107492905 B CN107492905 B CN 107492905B
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- 239000003990 capacitor Substances 0.000 claims description 14
- 230000001105 regulatory effect Effects 0.000 claims description 9
- 230000001629 suppression Effects 0.000 claims description 7
- 238000004134 energy conservation Methods 0.000 abstract description 4
- 230000002401 inhibitory effect Effects 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 17
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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
- H02S40/32—Electrical components comprising DC/AC inverter means associated with the PV module itself, e.g. AC modules
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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
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
Abstract
The invention discloses an alternating current common mode voltage adjusting device and a photovoltaic system applying the same, wherein the alternating current common mode voltage adjusting device is connected with an active clamping device at the alternating current output side of a photovoltaic inverter, the active clamping device generates suspended bus voltage through conversion, the suspended bus voltage is connected with the ground, and the suspended bus voltage and the alternating current side common mode voltage form a fixed proportional relation through the control of the active clamping device, so that the active clamping device can adjust the suspended bus voltage to realize the adjustment of the alternating current output side common mode voltage, further adjust the ground voltage of a negative electrode of a photovoltaic assembly, and finally achieve the purpose of inhibiting PID effect. Compared with the traditional mode for solving the PID effect, the invention has the advantages of good inhibition effect on the PID effect, simple structure, low loss and contribution to energy conservation and emission reduction.
Description
Technical Field
The invention relates to the technical field of photovoltaic power generation, in particular to an alternating current common mode voltage adjusting device and a photovoltaic system applying the same.
Background
It is known that the induced attenuation of the component potential (PID effect) in photovoltaic systems leads to attenuation of the component characteristics, which affects the service life. The current industry solves the PID effect by using a passive device on the ac side to form a neutral point device, applying a dc voltage between the neutral point device and the ground, and changing the voltage to ground on the dc side to improve the PID effect. However, the neutral point device in the method consists of a full-power passive device, so that great loss exists, and energy conservation and emission reduction are not facilitated.
Disclosure of Invention
The present invention aims to solve the problems mentioned in the background section above by means of an ac common mode voltage regulating device and a photovoltaic system applying the same.
In order to achieve the purpose, the invention adopts the following technical scheme:
an AC common mode voltage regulating device comprises an active clamping device; the active clamping device is connected to the alternating current output side of the photovoltaic system inverter; the active clamping device generates a suspended bus voltage through conversion; the voltage of the suspension bus is grounded; the active clamping device controls the voltage of the suspension bus and the common-mode voltage at the alternating current side to be in a fixed proportional relation, and adjusts the common-mode voltage at the alternating current side by adjusting the voltage of the suspension bus; the voltage to ground of the negative electrode of the photovoltaic module changes along with the change of the common-mode voltage of the alternating current side, and the suppression of the PID effect is completed.
In particular, the active clamping device employs, but is not limited to, any one of a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and an I-type three-level three-phase half-bridge configuration.
In particular, the floating bus voltage ground is any one of, but not limited to, the following: any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded; grounding points are taken from the voltage division capacitors at two ends of the voltage of the suspension bus and grounded; thirdly, grounding a grounding point on the voltage dividing resistors at two ends of the voltage of the suspension bus; and fourthly, grounding points are taken from the voltage division inductors at two ends of the voltage of the suspension bus to be grounded.
In particular, any point between the negative pole, the positive pole or the bus of the suspended bus voltage is grounded by any one of the following modes: firstly, any point among the negative pole, the positive pole or the bus of the suspension bus voltage is directly grounded; any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a resistor; thirdly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through a resistor and a capacitor; fourthly, any point among the negative pole, the positive pole or the bus of the voltage of the suspension bus is grounded through an inductor; fifthly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through an inductance series resistor; sixthly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode; and seventhly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode series resistor or an inductor.
The invention also discloses a photovoltaic system applying the alternating current common mode voltage adjusting device, and the system comprises the alternating current common mode voltage adjusting device; the alternating current common mode voltage regulating device comprises an active clamping device; the active clamping device is connected to the alternating current output side of the photovoltaic system inverter; the active clamping device generates a suspended bus voltage through conversion; the voltage of the suspension bus is grounded; the active clamping device controls the voltage of the suspension bus and the common-mode voltage at the alternating current side to be in a fixed proportional relation, and adjusts the common-mode voltage at the alternating current side by adjusting the voltage of the suspension bus; the voltage to ground of the negative electrode of the photovoltaic module changes along with the change of the common-mode voltage of the alternating current side, and the suppression of the PID effect is completed.
In particular, the active clamping device employs, but is not limited to, any one of a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and an I-type three-level three-phase half-bridge configuration.
In particular, the floating bus voltage ground is any one of, but not limited to, the following: any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded; grounding points are taken from the voltage division capacitors at two ends of the voltage of the suspension bus and grounded; thirdly, grounding a grounding point on the voltage dividing resistors at two ends of the voltage of the suspension bus; and fourthly, grounding points are taken from the voltage division inductors at two ends of the voltage of the suspension bus to be grounded.
In particular, any point between the negative pole, the positive pole or the bus of the suspended bus voltage is grounded by any one of the following modes: firstly, any point among the negative pole, the positive pole or the bus of the suspension bus voltage is directly grounded; any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a resistor; thirdly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through a resistor and a capacitor; fourthly, any point among the negative pole, the positive pole or the bus of the voltage of the suspension bus is grounded through an inductor; fifthly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through an inductance series resistor; sixthly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode; and seventhly, any point among the negative electrode, the positive electrode or the bus line of the suspension bus voltage is grounded through a diode series resistor or an inductor.
The alternating current common mode voltage adjusting device and the photovoltaic system applying the same are connected with an active clamping device at the alternating current output side of the photovoltaic inverter, the active clamping device generates suspended bus voltage through conversion, the bus voltage is connected with the ground, and the suspended bus voltage and the alternating current side common mode voltage form a fixed proportional relation under the control of the active clamping device, so that the purpose of adjusting the alternating current output side common mode voltage can be achieved by adjusting the suspended bus voltage through the active clamping device, the ground voltage of the negative electrode of the photovoltaic assembly is adjusted, and the purpose of inhibiting the PID effect is finally achieved. Compared with the traditional mode for solving the PID effect, the invention has the advantages of good inhibition effect on the PID effect, simple structure, low loss and contribution to energy conservation and emission reduction.
Drawings
Fig. 1 is a first schematic application diagram of an ac common mode voltage regulator according to an embodiment of the present invention;
fig. 2 is a schematic diagram illustrating an application of an ac common mode voltage regulator according to an embodiment of the present invention;
fig. 3 is a third schematic view of an application of the ac common mode voltage regulator according to the embodiment of the present invention;
fig. 4 is a schematic diagram illustrating a fourth application of the ac common mode voltage regulator according to the embodiment of the present invention;
fig. 5 is a schematic diagram illustrating an application of the ac common mode voltage adjusting apparatus according to the embodiment of the present invention;
fig. 6 is a sixth schematic view illustrating an application of the ac common mode voltage adjusting apparatus according to the embodiment of the present invention;
fig. 7 is a seventh schematic view of an application of the ac common mode voltage regulator according to the embodiment of the present invention;
fig. 8 is an application schematic diagram eight of the ac common mode voltage adjusting apparatus according to the embodiment of the present invention;
fig. 9 is a schematic diagram nine illustrating an application of the ac common mode voltage adjusting apparatus according to the embodiment of the present invention;
fig. 10 is a schematic view illustrating an application of the ac common mode voltage regulator according to the embodiment of the present invention;
fig. 11 is an eleventh schematic view illustrating an application of the ac common mode voltage regulator according to the embodiment of the present invention;
fig. 12 is a twelfth application schematic diagram of the ac common mode voltage adjustment apparatus according to the embodiment of the present invention;
fig. 13 is a schematic diagram of a thirteenth application of the ac common mode voltage regulator according to the embodiment of the present invention;
fig. 14 is a fourteenth application schematic diagram of the ac common mode voltage adjustment apparatus according to the embodiment of the present invention.
Detailed Description
To facilitate an understanding of the invention, the invention will now be described more fully with reference to the accompanying drawings. Preferred embodiments of the present invention are shown in the drawings. This invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. Rather, these embodiments are provided so that this disclosure will be thorough and complete. It will be understood that when an element is referred to as being "connected" to another element, it can be directly connected to the other element or intervening elements may also be present. Unless defined otherwise, all technical and scientific terms used herein have the same meaning as commonly understood by one of ordinary skill in the art to which this invention belongs. The terminology used in the description of the invention herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the term "and/or" includes any and all combinations of one or more of the associated listed items.
In the embodiment, the ac common mode voltage adjusting device specifically includes an active clamping device; the active clamping device is connected to the alternating current output side of a photovoltaic system inverter (namely a photovoltaic inverter); the active clamping device generates a suspended bus voltage through conversion; the voltage of the suspension bus is grounded; the active clamping device controls the voltage of the suspension bus and the common-mode voltage at the alternating current side to be in a fixed proportional relation, and adjusts the common-mode voltage at the alternating current side by adjusting the voltage of the suspension bus; the voltage to ground of the negative electrode of the photovoltaic module changes along with the change of the common-mode voltage of the alternating current side, and the suppression of the PID effect is completed.
In this embodiment, as shown in fig. 1, the floating bus voltage of the active clamping device is Ubus, the ac-side common mode voltage is Uacm, the voltage to ground of the negative electrode of the photovoltaic module is Upv-pe, and the active clamping device controls the active clamping device to make a fixed proportional relationship between the ac-side common mode voltage Uacm and the floating bus voltage Ubus:
Uacm＝K1*Ubus
according to the characteristics of the photovoltaic system inverter, the relation between the common-mode voltage Uacm at the alternating current side and the voltage Upv-pe of the negative electrode of the photovoltaic module to ground is as follows:
Upv-pe＝K2*Uacm
from the above relationship, it follows:
Upv-pe＝K1*K2*Ubus
therefore, the active clamping device can adjust the common mode voltage Uacm on the alternating current side by adjusting the suspended bus voltage Ubus, the voltage Upv-pe of the negative electrode of the photovoltaic module to the ground changes along with the change of the common mode voltage Uacm on the alternating current side, the size of the voltage Upv-pe of the negative electrode of the photovoltaic module to the ground can be adjusted, and the suppression of the PID effect is completed.
In the present embodiment, the active clamping device is any one of, but not limited to, a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and an I-type three-level three-phase half-bridge. As shown in fig. 2 to 4, fig. 2 is a schematic diagram of an application of an active clamping device using a two-level three-phase half-bridge structure; FIG. 3 is a schematic diagram of an application of an active clamping device adopting a T-type three-level three-phase half-bridge structure; FIG. 4 is a schematic diagram of an application of an active clamp device using a type I three-level three-phase half-bridge structure; qx in fig. 2 to 4 denotes a switching device of a bridge circuit, which may be an IGBT, a MOSFET transistor or other power electronic switching device. It should be noted that the attached drawings only show application schematic diagrams of active clamping devices adopting a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and an I-type three-level three-phase half-bridge structure, but the active clamping devices are not limited to these examples in practical application, and the active clamping devices may also be in other bridge circuit structural forms capable of realizing three-phase inversion, such as a three-phase full-bridge, a three-phase four-bridge arm, a five-level three-phase half-bridge, a multi-level three-phase bridge circuit, and three single-phase topologies, as.
As for the grounding mode of the floating bus voltage, any one of the following modes is adopted in the embodiment without limitation: any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded; specifically, the grounding mode of any point between the negative electrode and the positive electrode of the floating bus voltage or between the buses includes, but is not limited to: 1. any point among the negative pole, the positive pole or the bus of the voltage of the suspension bus is directly grounded; fig. 1 to 4 show the case where the negative electrode is directly grounded; 2. any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded through a resistor R; fig. 5 is a case where the negative pole of the floating bus voltage is grounded through a resistor R; 3. any point among the negative electrode, the positive electrode or the bus line of the suspension bus voltage is grounded through a resistor R and a capacitor C; FIG. 6 is a case where the negative pole of the floating bus voltage is grounded through a resistor R and a capacitor C; 4. any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through an inductor L; fig. 7 shows the case where the negative pole of the floating bus voltage is grounded via the inductor L; 5. any point among the negative electrode, the positive electrode or the bus of the suspended bus voltage is grounded through an inductor L series resistor R; fig. 8 shows the condition that any point among the negative pole, the positive pole or the bus bar of the suspended bus bar voltage is grounded through the series resistor R of the inductor L; 6. any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded through a diode D; fig. 9 is a case where the negative pole of the floating bus voltage is grounded through a diode D; 7. any point among the negative electrode, the positive electrode or the bus line of the suspended bus voltage is grounded through a diode D series resistor R; fig. 10 shows a case where the negative pole of the floating bus voltage is grounded via a diode D series resistor R, but the present invention is not limited thereto, and the negative pole of the floating bus voltage may be grounded via a diode D series inductor. Secondly, as shown in fig. 11, grounding points are grounded on voltage dividing capacitors (C1, C2 … Cn) at two ends of the floating bus voltage; thirdly, as shown in fig. 12, grounding points are grounded on voltage dividing resistors (R1, R2 … Rn) at two ends of the suspended bus voltage; and fourthly, as shown in fig. 13, grounding points are grounded on the voltage division inductors (L1 and L2 … Ln) at two ends of the suspended bus voltage. It should be noted that the selection of the floating bus voltage grounding point is not limited to the above manner, and the grounding point may be taken from a voltage dividing point formed by other devices as long as the required function can be realized.
Based on the alternating current common mode voltage adjusting device, the embodiment also discloses a photovoltaic system, which comprises an alternating current common mode voltage adjusting device; the alternating current common mode voltage regulating device comprises an active clamping device; the active clamping device is connected to the alternating current output side of the photovoltaic system inverter; the active clamping device generates a suspended bus voltage through conversion; the voltage of the suspension bus is grounded; the active clamping device controls the voltage of the suspension bus and the common-mode voltage at the alternating current side to be in a fixed proportional relation, and adjusts the common-mode voltage at the alternating current side by adjusting the voltage of the suspension bus; the voltage to ground of the negative electrode of the photovoltaic module changes along with the change of the common-mode voltage of the alternating current side, and the suppression of the PID effect is completed.
In the present embodiment, the active clamping device is any one of, but not limited to, a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and an I-type three-level three-phase half-bridge. As shown in fig. 2 to 4, fig. 2 is a schematic diagram of an application of an active clamping device using a two-level three-phase half-bridge structure; FIG. 3 is a schematic diagram of an application of an active clamping device adopting a T-type three-level three-phase half-bridge structure; FIG. 4 is a schematic diagram of an application of an active clamp device using a type I three-level three-phase half-bridge structure; qx in fig. 2 to 4 denotes a switching device of a bridge circuit, which may be an IGBT, a MOSFET transistor or other power electronic switching device. It should be noted that the attached drawings only show application schematic diagrams of active clamping devices adopting a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and an I-type three-level three-phase half-bridge structure, but the active clamping devices are not limited to these examples in practical application, and the active clamping devices may also be in other bridge circuit structural forms capable of realizing three-phase inversion, such as a three-phase full-bridge, a three-phase four-bridge arm, a five-level three-phase half-bridge, a multi-level three-phase bridge circuit, and three single-phase topologies, as.
As for the grounding mode of the floating bus voltage, any one of the following modes is adopted in the embodiment without limitation: any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded; specifically, the grounding mode of any point between the negative electrode and the positive electrode of the floating bus voltage or between the buses includes, but is not limited to: 1. any point among the negative pole, the positive pole or the bus of the voltage of the suspension bus is directly grounded; fig. 1 to 4 show the case where the negative electrode is directly grounded; 2. any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded through a resistor R; fig. 5 is a case where the negative pole of the floating bus voltage is grounded through a resistor R; 3. any point among the negative electrode, the positive electrode or the bus line of the suspension bus voltage is grounded through a resistor R and a capacitor C; FIG. 6 is a case where the negative pole of the floating bus voltage is grounded through a resistor R and a capacitor C; 4. any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through an inductor L; fig. 7 shows the case where the negative pole of the floating bus voltage is grounded via the inductor L; 5. any point among the negative electrode, the positive electrode or the bus of the suspended bus voltage is grounded through an inductor L series resistor R; fig. 8 shows the condition that any point among the negative pole, the positive pole or the bus bar of the suspended bus bar voltage is grounded through the series resistor R of the inductor L; 6. any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded through a diode D; fig. 9 is a case where the negative pole of the floating bus voltage is grounded through a diode D; 7. any point among the negative electrode, the positive electrode or the bus line of the suspended bus voltage is grounded through a diode D series resistor R; fig. 10 shows a case where the negative pole of the floating bus voltage is grounded via a diode D series resistor R, but the present invention is not limited thereto, and the negative pole of the floating bus voltage may be grounded via a diode D series inductor. Secondly, as shown in fig. 11, grounding points are grounded on voltage dividing capacitors (C1, C2 … Cn) at two ends of the floating bus voltage; thirdly, as shown in fig. 12, grounding points are grounded on voltage dividing resistors (R1, R2 … Rn) at two ends of the suspended bus voltage; and fourthly, as shown in fig. 13, grounding points are grounded on the voltage division inductors (L1 and L2 … Ln) at two ends of the suspended bus voltage. It should be noted that the selection of the floating bus voltage grounding point is not limited to the above manner, and the grounding point may be taken from a voltage dividing point formed by other devices as long as the required function can be realized.
In fig. 1 to 14, each Upv refers to a photovoltaic module. It should be noted that, in the above embodiments, the ac common mode voltage adjusting device is described by taking a photovoltaic system (grid-connected system) with a transformer as an example, but the present invention is not limited thereto, and as shown in fig. 14, the ac common mode voltage adjusting device may also be applied to a grid-connected system without a transformer.
According to the technical scheme, the active clamping device is connected to the alternating current output side of the photovoltaic inverter, the active clamping device generates the suspended bus voltage through conversion, the bus voltage is connected with the ground, and the suspended bus voltage and the alternating current side common mode voltage form a fixed proportion relation under the control of the active clamping device, so that the purpose of adjusting the alternating current output side common mode voltage can be achieved by adjusting the suspended bus voltage through the active clamping device, the voltage of the negative electrode of the photovoltaic module to the ground is further adjusted, and the purpose of inhibiting the PID effect is finally achieved. Compared with the traditional mode for solving the PID effect, the invention has the advantages of good inhibition effect on the PID effect, simple structure, low loss and contribution to energy conservation and emission reduction.
It is to be noted that the foregoing is only illustrative of the preferred embodiments of the present invention and the technical principles employed. 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, although the present invention has been described in greater detail by the above embodiments, the present invention is not limited to the above embodiments, and may include other equivalent embodiments without departing from the spirit of the present invention, and the scope of the present invention is determined by the scope of the appended claims.
Claims (8)
1. An AC common mode voltage regulating device is characterized by comprising an active clamping device; the active clamping device is connected to the alternating current output side of the photovoltaic system inverter; the active clamping device generates a suspended bus voltage through conversion; the voltage of the suspension bus is grounded; the active clamping device controls the voltage of the suspension bus and the common-mode voltage at the alternating current side to be in a fixed proportional relation, and adjusts the common-mode voltage at the alternating current side by adjusting the voltage of the suspension bus; the voltage to ground of the negative electrode of the photovoltaic module changes along with the change of the common-mode voltage of the alternating current side, and the suppression of the PID effect is completed.
2. An ac common-mode voltage regulating device according to claim 1, wherein said active clamping device adopts any one of but not limited to two-level three-phase half-bridge, T type three-level three-phase half-bridge, I type three-level three-phase half-bridge structure.
3. An ac common-mode voltage regulating device according to any one of claims 1 or 2, characterized in that the floating bus voltage ground is any one of but not limited to the following: any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded; grounding points are taken from the voltage division capacitors at two ends of the voltage of the suspension bus and grounded; thirdly, grounding a grounding point on the voltage dividing resistors at two ends of the voltage of the suspension bus; and fourthly, grounding points are taken from the voltage division inductors at two ends of the voltage of the suspension bus to be grounded.
4. An ac common-mode voltage regulator according to claim 3, wherein any point between the negative pole, the positive pole or the bus of the floating bus voltage is grounded by any one of but not limited to the following means: firstly, any point among the negative pole, the positive pole or the bus of the suspension bus voltage is directly grounded; any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a resistor; thirdly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through a resistor and a capacitor; fourthly, any point among the negative pole, the positive pole or the bus of the voltage of the suspension bus is grounded through an inductor; fifthly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through an inductance series resistor; sixthly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode; and seventhly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode series resistor or an inductor.
5. A photovoltaic system comprising the AC common mode voltage regulating device of any one of claims 1 to 4; the alternating current common mode voltage regulating device comprises an active clamping device; the active clamping device is connected to the alternating current output side of the photovoltaic system inverter; the active clamping device generates a suspended bus voltage through conversion; the voltage of the suspension bus is grounded; the active clamping device controls the voltage of the suspension bus and the common-mode voltage at the alternating current side to be in a fixed proportional relation, and adjusts the common-mode voltage at the alternating current side by adjusting the voltage of the suspension bus; the voltage to ground of the negative electrode of the photovoltaic module changes along with the change of the common-mode voltage of the alternating current side, and the suppression of the PID effect is completed.
6. The photovoltaic system of claim 5, wherein the active clamping means employs, but is not limited to, any one of a two-level three-phase half-bridge, a T-type three-level three-phase half-bridge, and a I-type three-level three-phase half-bridge configuration.
7. The photovoltaic system of any of claims 5 or 6, wherein the floating bus voltage ground is any of, but not limited to: any point among the negative pole, the positive pole or the bus of the suspension bus voltage is grounded; grounding points are taken from the voltage division capacitors at two ends of the voltage of the suspension bus and grounded; thirdly, grounding a grounding point on the voltage dividing resistors at two ends of the voltage of the suspension bus; and fourthly, grounding points are taken from the voltage division inductors at two ends of the voltage of the suspension bus to be grounded.
8. The pv system of claim 7 wherein any point between the negative, positive or bus bars of the floating bus voltage is grounded by, but not limited to, any of the following means: firstly, any point among the negative pole, the positive pole or the bus of the suspension bus voltage is directly grounded; any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a resistor; thirdly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through a resistor and a capacitor; fourthly, any point among the negative pole, the positive pole or the bus of the voltage of the suspension bus is grounded through an inductor; fifthly, any point among the negative electrode, the positive electrode or the bus of the voltage of the suspension bus is grounded through an inductance series resistor; sixthly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode; and seventhly, any point among the negative electrode, the positive electrode or the bus of the suspension bus voltage is grounded through a diode series resistor or an inductor.
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| CN104638891A (en) * | 2015-02-15 | 2015-05-20 | 无锡上能新能源有限公司 | Common-mode voltage suppression system for photovoltaic grid-connected inverter |
| CN104901618A (en) * | 2015-05-27 | 2015-09-09 | 华为技术有限公司 | Power supply system and power supply method |
| CN105680793A (en) * | 2016-03-23 | 2016-06-15 | 阳光电源股份有限公司 | Voltage compensation device for photovoltaic system and photovoltaic system |
| CN105915172A (en) * | 2016-05-11 | 2016-08-31 | 阳光电源股份有限公司 | Device and method of inhibiting potential induced degeneration |
| CN106208952A (en) * | 2016-08-31 | 2016-12-07 | 上能电气股份有限公司 | A kind of method of photovoltaic system anti-PID effect |
| CN106961118A (en) * | 2017-03-24 | 2017-07-18 | 江苏固德威电源科技股份有限公司 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
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| CN104638891A (en) * | 2015-02-15 | 2015-05-20 | 无锡上能新能源有限公司 | Common-mode voltage suppression system for photovoltaic grid-connected inverter |
| CN104901618A (en) * | 2015-05-27 | 2015-09-09 | 华为技术有限公司 | Power supply system and power supply method |
| CN105680793A (en) * | 2016-03-23 | 2016-06-15 | 阳光电源股份有限公司 | Voltage compensation device for photovoltaic system and photovoltaic system |
| CN105915172A (en) * | 2016-05-11 | 2016-08-31 | 阳光电源股份有限公司 | Device and method of inhibiting potential induced degeneration |
| CN106208952A (en) * | 2016-08-31 | 2016-12-07 | 上能电气股份有限公司 | A kind of method of photovoltaic system anti-PID effect |
| CN106961118A (en) * | 2017-03-24 | 2017-07-18 | 江苏固德威电源科技股份有限公司 | Have the control device and control method of the suppression of PID effects and repair function concurrently |
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