CN107492905A - A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device - Google Patents
A kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device Download PDFInfo
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- CN107492905A CN107492905A CN201710722992.2A CN201710722992A CN107492905A CN 107492905 A CN107492905 A CN 107492905A CN 201710722992 A CN201710722992 A CN 201710722992A CN 107492905 A CN107492905 A CN 107492905A
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- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 230000033228 biological regulation Effects 0.000 abstract description 5
- 230000009286 beneficial effect Effects 0.000 abstract description 3
- 238000010276 construction Methods 0.000 abstract description 3
- 230000005764 inhibitory process Effects 0.000 abstract description 3
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Classifications
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- H02J3/383—
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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 present invention discloses a kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device, the exchange common-mode voltage adjusting means accesses active clamp device in the exchange outlet side of photovoltaic DC-to-AC converter, the active clamp device generates suspension busbar voltage by converting, the suspension busbar voltage is connected with the earth, controlled by active clamp device, suspension busbar voltage is set to form fixed proportionate relationship with AC common-mode voltage, so active clamp device regulation suspension busbar voltage is that the regulation to exchanging outlet side common-mode voltage can be achieved, and then it have adjusted photovoltaic module negative pole voltage-to-ground, it has been finally reached the purpose for suppressing PID effects.Compared with the mode that tradition solves PID effects, the present invention is not only good and simple in construction to the inhibition of PID effects, and loss is small, beneficial to energy-saving and emission-reduction.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly to one kind to exchange common-mode voltage adjusting means and apply the dress
The photovoltaic system put.
Background technology
It is well known that component potential induction attenuation (PID effects) can cause component characteristic to decay in photovoltaic system, shadow
Ring service life.The mode that industry solves PID effects at present is using passive device composition neutral point device, in AC
Property point device and the earth between apply DC voltage, change DC side voltage-to-ground to improve PID effects.But the above method
Neutral point device is made up of total power passive device, very lossy is present, is unfavorable for energy-saving and emission-reduction.
The content of the invention
It is an object of the invention to by a kind of photovoltaic system for exchanging common-mode voltage adjusting means and the application device, come
Solve the problems, such as that background section above is mentioned.
To use following technical scheme up to this purpose, the present invention：
One kind exchange common-mode voltage adjusting means, it includes active clamp device；The active clamp device is connected on photovoltaic
The exchange outlet side of system inverter；The active clamp device generates suspension busbar voltage by converting；The suspension bus
Voltage ground；The active clamp device controls the suspension busbar voltage and AC common-mode voltage to be closed into fixed ratio
System, and by adjusting suspension varying DC link voltage AC common-mode voltage；Photovoltaic module negative pole voltage-to-ground is with the AC
Common-mode voltage variation and change, complete the suppression to PID effects.
Especially, the active clamp device uses but is not limited to two level three-phase half-bridges, T-shaped three-level three-phase half-bridge, I
The three-phase half-bridge structure of the level of type three it is any.
Especially, the suspension busbar voltage ground connection uses but is not limited to any of in the following manner：First, the mother that suspends
Any point ground connection between the negative pole of line voltage, positive pole or bus；2nd, taken on the derided capacitors at the suspension busbar voltage both ends
Earth point is grounded；3rd, earth point is taken to be grounded on the divider resistance at the suspension busbar voltage both ends；4th, in the mother that suspends
Earth point is taken to be grounded on the partial pressure inductance at line voltage both ends.
Especially, between the negative pole of the suspension busbar voltage, positive pole or bus any point ground connection use but be not limited to
Under type it is any：First, any point between the negative pole of the suspension busbar voltage, positive pole or bus is directly grounded；2nd, it is described
Any point between the negative pole of suspension busbar voltage, positive pole or bus passes through resistance eutral grounding；3rd, the suspension busbar voltage is negative
Any point between pole, positive pole or bus passes through resistance and capacity earth；4th, negative pole, positive pole or the mother of the suspension busbar voltage
Any point between line is grounded by inductance；5th, any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through electricity
Feel string resistance ground connection；6th, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by diode；7th,
Any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through diode string resistance or inductance is grounded.
The invention also discloses a kind of photovoltaic system using above-mentioned exchange common-mode voltage adjusting means, the system includes handing over
Flow common-mode voltage adjusting means；The exchange common-mode voltage adjusting means includes active clamp device；The active clamp device
It is connected on the exchange outlet side of photovoltaic system inverter；The active clamp device generates suspension busbar voltage by converting；It is described
Suspension busbar voltage is grounded；The active clamp device controls the suspension busbar voltage and AC common-mode voltage into fixed
Proportionate relationship, and by adjusting suspension varying DC link voltage AC common-mode voltage；Photovoltaic module negative pole voltage-to-ground is with described
AC common-mode voltage variation and change, complete the suppression to PID effects.
Especially, the active clamp device uses but is not limited to two level three-phase half-bridges, T-shaped three-level three-phase half-bridge, I
The three-phase half-bridge structure of the level of type three it is any.
Especially, the suspension busbar voltage ground connection uses but is not limited to any of in the following manner：First, the mother that suspends
Any point ground connection between the negative pole of line voltage, positive pole or bus；2nd, taken on the derided capacitors at the suspension busbar voltage both ends
Earth point is grounded；3rd, earth point is taken to be grounded on the divider resistance at the suspension busbar voltage both ends；4th, in the mother that suspends
Earth point is taken to be grounded on the partial pressure inductance at line voltage both ends.
Especially, between the negative pole of the suspension busbar voltage, positive pole or bus any point ground connection use but be not limited to
Under type it is any：First, any point between the negative pole of the suspension busbar voltage, positive pole or bus is directly grounded；2nd, it is described
Any point between the negative pole of suspension busbar voltage, positive pole or bus passes through resistance eutral grounding；3rd, the suspension busbar voltage is negative
Any point between pole, positive pole or bus passes through resistance and capacity earth；4th, negative pole, positive pole or the mother of the suspension busbar voltage
Any point between line is grounded by inductance；5th, any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through electricity
Feel string resistance ground connection；6th, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by diode；7th,
Any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through diode series resistance or inductance is grounded.
The photovoltaic system of exchange common-mode voltage adjusting means proposed by the present invention and the application device is in photovoltaic DC-to-AC converter
Outlet side access active clamp device is exchanged, active clamp device generates suspension busbar voltage by converting, by this busbar voltage
It is connected with the earth, is controlled by active clamp device, suspension busbar voltage and AC common-mode voltage is formed fixed ratio
Relation, such active clamp device regulation suspension busbar voltage are that can reach the purpose of regulation exchange outlet side common-mode voltage, are entered
And photovoltaic module negative pole voltage-to-ground is have adjusted, it has been finally reached the purpose for suppressing PID effects.Solve PID effects with tradition
Mode is compared, and the present invention is not only good and simple in construction to the inhibition of PID effects, and loss is small, beneficial to energy-saving and emission-reduction.
Brief description of the drawings
Fig. 1 is exchange common-mode voltage adjusting means application schematic diagram one provided in an embodiment of the present invention；
Fig. 2 is exchange common-mode voltage adjusting means application schematic diagram two provided in an embodiment of the present invention；
Fig. 3 is exchange common-mode voltage adjusting means application schematic diagram three provided in an embodiment of the present invention；
Fig. 4 is exchange common-mode voltage adjusting means application schematic diagram four provided in an embodiment of the present invention；
Fig. 5 is exchange common-mode voltage adjusting means application schematic diagram five provided in an embodiment of the present invention；
Fig. 6 is exchange common-mode voltage adjusting means application schematic diagram six provided in an embodiment of the present invention；
Fig. 7 is exchange common-mode voltage adjusting means application schematic diagram seven provided in an embodiment of the present invention；
Fig. 8 is exchange common-mode voltage adjusting means application schematic diagram eight provided in an embodiment of the present invention；
Fig. 9 is exchange common-mode voltage adjusting means application schematic diagram nine provided in an embodiment of the present invention；
Figure 10 is exchange common-mode voltage adjusting means application schematic diagram ten provided in an embodiment of the present invention；
Figure 11 is exchange common-mode voltage adjusting means application schematic diagram 11 provided in an embodiment of the present invention；
Figure 12 is exchange common-mode voltage adjusting means application schematic diagram 12 provided in an embodiment of the present invention；
Figure 13 is exchange common-mode voltage adjusting means application schematic diagram 13 provided in an embodiment of the present invention；
Figure 14 is exchange common-mode voltage adjusting means application schematic diagram 14 provided in an embodiment of the present invention.
Embodiment
For the ease of understanding the present invention, the present invention is described more fully below with reference to relevant drawings.In accompanying drawing
Give presently preferred embodiments of the present invention.But the present invention can realize in many different forms, however it is not limited to this paper institutes
The embodiment of description.On the contrary, the purpose for providing these embodiments is made to the more thorough of the disclosure understanding
Comprehensively.It should be noted that when an element is considered as " connection " another element, it can be directly to another
Element may be simultaneously present centering elements.Unless otherwise defined, all of technologies and scientific terms used here by the article with
The implication that the those skilled in the art for belonging to of the invention are generally understood that is identical.Made in the description of the invention herein
Term is intended merely to describe the purpose of specific embodiment, it is not intended that in the limitation present invention.Term as used herein
" and/or " include the arbitrary and all combinations of one or more related Listed Items.
Common-mode voltage adjusting means is exchanged in the present embodiment and specifically includes active clamp device；The active clamp device connects
In the exchange outlet side of photovoltaic system inverter (i.e. photovoltaic DC-to-AC converter)；The active clamp device generates the mother that suspends by converting
Line voltage；The suspension busbar voltage ground connection；The active clamp device controls the suspension busbar voltage and AC common mode
Voltage is into fixed proportionate relationship, and by adjusting suspension varying DC link voltage AC common-mode voltage；Photovoltaic module negative pole pair
Ground voltage changes with the AC common-mode voltage variation, completes the suppression to PID effects.
In the present embodiment, as shown in figure 1, the suspension busbar voltage of the active clamp device is Ubus, AC is common
Mode voltage is Uacm, and photovoltaic module negative pole voltage-to-ground is Upv-pe, is controlled by active clamp device so that AC common mode
Into fixed proportionate relationship between voltage Uacm and suspension busbar voltage Ubus：
Uacm=K1*Ubus
And according to photovoltaic system inverter characteristics, AC common-mode voltage Uacm and photovoltaic module negative pole voltage-to-ground Upv-
Pe relation is as follows：
Upv-pe=K2*Uacm
It can be drawn according to relational expression as above：
Upv-pe=K1*K2*Ubus
Therefore, the active clamp device is by adjusting the i.e. adjustable AC common-mode voltages of suspension busbar voltage Ubus
Uacm, and photovoltaic module negative pole voltage-to-ground Upv-pe changes and changed with AC common-mode voltage Uacm, and then adjustable light
Component negative pole voltage-to-ground Upv-pe sizes are lied prostrate, complete the suppression to PID effects.
The active clamp device uses but is not limited to two level three-phase half-bridges, T-shaped three-level three-phase in the present embodiment
Half-bridge, the level of I types three three-phase half-bridge structure it is any.As shown in Figures 2 to 4, Fig. 2 is using two level three-phase half-bridge knots
The application schematic diagram of the active clamp device of structure；Fig. 3 is answering using the active clamp device of T-shaped three-level three-phase half-bridge structure
Use schematic diagram；Fig. 4 is the application schematic diagram using the active clamp device of the three-phase half-bridge structure of the level of I types three；Fig. 2 to Fig. 4
Middle Qx represents the switching device of bridge circuit, and the switching device can use IGBT, MOSFET pipe or other electronic power switch devices
Part.It should be noted that accompanying drawing is only gived using two level three-phase half-bridges, T-shaped three-level three-phase half-bridge, the level of I types three
The application schematic diagram of the active clamp device of three-phase half-bridge structure, but be not limited thereto during practical application, active clamp device
Three phase full bridge, three-phase four-arm, five level three-phase half-bridges, more level three-phase bridge circuits, three single-phase topologys etc. also can be used
The bridge circuit structure form of other achievable three-phase inversions, as long as corresponding function can be realized.
For the earthing mode of suspension busbar voltage, use in the present embodiment but be not limited to any of in the following manner：
First, any point ground connection between the negative pole of the suspension busbar voltage, positive pole or bus；Specifically, shown suspension busbar voltage
The mode of any point ground connection between negative pole, positive pole or bus includes but is not limited to again：1st, the negative pole of the suspension busbar voltage, just
Any point between pole or bus is directly grounded；Fig. 1 to Fig. 4 is the situation that negative pole is directly grounded；2nd, the suspension busbar voltage
Any point between negative pole, positive pole or bus is grounded by resistance R；Fig. 5 is what the negative pole of suspension busbar voltage was grounded by resistance R
Situation；3rd, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by resistance R and electric capacity C；Fig. 6 is
The negative pole of suspension busbar voltage passes through resistance R and the situation of electric capacity C ground connection；4th, the negative pole of the suspension busbar voltage, positive pole or
Any point between bus is grounded by inductance L；Fig. 7 is the situation that the negative pole of suspension busbar voltage is grounded by inductance L；5th, it is described
Any point between the negative pole of suspension busbar voltage, positive pole or bus passes through inductance L string resistances R ground connection；Fig. 8 is suspension busbar voltage
Negative pole, the situation about being grounded by inductance L string resistances R of any point between positive pole or bus；6th, the suspension busbar voltage is negative
Any point between pole, positive pole or bus is grounded by diode D；Fig. 9 is that the negative pole of suspension busbar voltage is grounded by diode D
Situation；7th, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by diode D string resistances R；Figure
10 situations about being grounded for the negative pole of suspension busbar voltage by diode D string resistances R, but be not limited thereto, suspension bus electricity
The negative pole of pressure can also be grounded by diode D series inductances.2nd, as shown in figure 11, at the suspension busbar voltage both ends
Earth point is taken to be grounded on derided capacitors (C1, C2 ... Cn)；3rd, as shown in figure 12, the partial pressure at the suspension busbar voltage both ends
Earth point is taken to be grounded on resistance (R1, R2 ... Rn)；4th, as shown in figure 13, the partial pressure inductance at the suspension busbar voltage both ends
Earth point is taken to be grounded on (L1, L2 ... Ln).It is noted that the selection of the suspension busbar voltage earth point is not limited to
Mode is stated, earth point can also be taken on the dividing point that other devices are formed, as long as required function can be realized.
Based on above-mentioned exchange common-mode voltage adjusting means, the present embodiment also discloses a kind of photovoltaic system, and the system includes
Exchange common-mode voltage adjusting means；The exchange common-mode voltage adjusting means includes active clamp device；The active clamp dress
Put the exchange outlet side for being connected on photovoltaic system inverter；The active clamp device generates suspension busbar voltage by converting；Institute
State suspension busbar voltage ground connection；The active clamp device controls the suspension busbar voltage and AC common-mode voltage into fixation
Proportionate relationship, and by adjusting suspension varying DC link voltage AC common-mode voltage；Photovoltaic module negative pole voltage-to-ground is with institute
State AC common-mode voltage variation and change, complete the suppression to PID effects.
The active clamp device uses but is not limited to two level three-phase half-bridges, T-shaped three-level three-phase in the present embodiment
Half-bridge, the level of I types three three-phase half-bridge structure it is any.As shown in Figures 2 to 4, Fig. 2 is using two level three-phase half-bridge knots
The application schematic diagram of the active clamp device of structure；Fig. 3 is answering using the active clamp device of T-shaped three-level three-phase half-bridge structure
Use schematic diagram；Fig. 4 is the application schematic diagram using the active clamp device of the three-phase half-bridge structure of the level of I types three；Fig. 2 to Fig. 4
Middle Qx represents the switching device of bridge circuit, and the switching device can use IGBT, MOSFET pipe or other electronic power switch devices
Part.It should be noted that accompanying drawing is only gived using two level three-phase half-bridges, T-shaped three-level three-phase half-bridge, the level of I types three
The application schematic diagram of the active clamp device of three-phase half-bridge structure, but be not limited thereto during practical application, active clamp device
Three phase full bridge, three-phase four-arm, five level three-phase half-bridges, more level three-phase bridge circuits, three single-phase topologys etc. also can be used
The bridge circuit structure form of other achievable three-phase inversions, as long as corresponding function can be realized.
For the earthing mode of suspension busbar voltage, use in the present embodiment but be not limited to any of in the following manner：
First, any point ground connection between the negative pole of the suspension busbar voltage, positive pole or bus；Specifically, shown suspension busbar voltage
The mode of any point ground connection between negative pole, positive pole or bus includes but is not limited to again：1st, the negative pole of the suspension busbar voltage, just
Any point between pole or bus is directly grounded；Fig. 1 to Fig. 4 is the situation that negative pole is directly grounded；2nd, the suspension busbar voltage
Any point between negative pole, positive pole or bus is grounded by resistance R；Fig. 5 is what the negative pole of suspension busbar voltage was grounded by resistance R
Situation；3rd, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by resistance R and electric capacity C；Fig. 6 is
The negative pole of suspension busbar voltage passes through resistance R and the situation of electric capacity C ground connection；4th, the negative pole of the suspension busbar voltage, positive pole or
Any point between bus is grounded by inductance L；Fig. 7 is the situation that the negative pole of suspension busbar voltage is grounded by inductance L；5th, it is described
Any point between the negative pole of suspension busbar voltage, positive pole or bus passes through inductance L string resistances R ground connection；Fig. 8 is suspension busbar voltage
Negative pole, the situation about being grounded by inductance L string resistances R of any point between positive pole or bus；6th, the suspension busbar voltage is negative
Any point between pole, positive pole or bus is grounded by diode D；Fig. 9 is that the negative pole of suspension busbar voltage is grounded by diode D
Situation；7th, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by diode D string resistances R；Figure
10 situations about being grounded for the negative pole of suspension busbar voltage by diode D string resistances R, but be not limited thereto, suspension bus electricity
The negative pole of pressure can also be grounded by diode D series inductances.2nd, as shown in figure 11, at the suspension busbar voltage both ends
Earth point is taken to be grounded on derided capacitors (C1, C2 ... Cn)；3rd, as shown in figure 12, the partial pressure at the suspension busbar voltage both ends
Earth point is taken to be grounded on resistance (R1, R2 ... Rn)；4th, as shown in figure 13, the partial pressure inductance at the suspension busbar voltage both ends
Earth point is taken to be grounded on (L1, L2 ... Ln).It is noted that the selection of the suspension busbar voltage earth point is not limited to
Mode is stated, earth point can also be taken on the dividing point that other devices are formed, as long as required function can be realized.
Fig. 1 Upv into Figure 14 refer both to photovoltaic module.It is noted that only it is to there is transformer in above-described embodiment
Exemplified by photovoltaic system (grid-connected system) to exchange common-mode voltage adjusting means carry out explanation, but the invention is not limited in this,
As shown in figure 14, exchange common-mode voltage adjusting means can be applied equally to without in transformer grid-connected system.
Technical scheme accesses active clamp device, active clamp device in the exchange outlet side of photovoltaic DC-to-AC converter
Suspension busbar voltage is generated by converting, this busbar voltage is connected with the earth, controlled by active clamp device, makes suspension female
Line voltage forms fixed proportionate relationship with AC common-mode voltage, and such active clamp device adjusts suspension busbar voltage
Reach the purpose of regulation exchange outlet side common-mode voltage, and then have adjusted photovoltaic module negative pole voltage-to-ground, be finally reached suppression
The purpose of PID effects processed.Compared with the mode that tradition solves PID effects, the present invention is not only good to the inhibition of PID effects,
And it is simple in construction, loss is small, beneficial to energy-saving and emission-reduction.
Pay attention to, above are only presently preferred embodiments of the present invention and institute's application technology principle.It will be appreciated by those skilled in the art that
The invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious changes,
Readjust and substitute without departing from protection scope of the present invention.Therefore, although being carried out by above example to the present invention
It is described in further detail, but the present invention is not limited only to above example, without departing from the inventive concept, also
Other more equivalent embodiments can be included, and the scope of the present invention is determined by scope of the appended claims.
Claims (8)
1. one kind exchange common-mode voltage adjusting means, it is characterised in that including active clamp device；The active clamp device connects
In the exchange outlet side of photovoltaic system inverter；The active clamp device generates suspension busbar voltage by converting；It is described outstanding
Floating busbar voltage ground connection；The active clamp device controls the suspension busbar voltage and AC common-mode voltage into fixed ratio
Example relation, and by adjusting suspension varying DC link voltage AC common-mode voltage；Photovoltaic module negative pole voltage-to-ground is with the friendship
Flow side common-mode voltage variation and change, complete the suppression to PID effects.
2. exchange common-mode voltage adjusting means according to claim 1, it is characterised in that the active clamp device uses
But be not limited to two level three-phase half-bridges, T-shaped three-level three-phase half-bridge, the level of I types three three-phase half-bridge structure it is any.
3. according to the exchange common-mode voltage adjusting means described in any one of claim 1 or 2, it is characterised in that the mother that suspends
Line voltage ground connection uses but is not limited to any of in the following manner：First, between the negative pole of the suspension busbar voltage, positive pole or bus
Any point ground connection；2nd, earth point is taken to be grounded on the derided capacitors at the suspension busbar voltage both ends；3rd, in the suspension
Earth point is taken to be grounded on the divider resistance at busbar voltage both ends；4th, taken on the partial pressure inductance at the suspension busbar voltage both ends
Earth point is grounded.
4. exchange common-mode voltage adjusting means according to claim 3, it is characterised in that the suspension busbar voltage is born
Any point ground connection between pole, positive pole or bus uses but is not limited to any of in the following manner：First, the suspension busbar voltage
Any point between negative pole, positive pole or bus is directly grounded；2nd, appointing between the negative pole of the suspension busbar voltage, positive pole or bus
Any passes through resistance eutral grounding；3rd, any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through resistance and electric capacity
Ground connection；4th, any point between the negative pole of the suspension busbar voltage, positive pole or bus is grounded by inductance；5th, the mother that suspends
Any point between the negative pole of line voltage, positive pole or bus is grounded by inductance string resistance；6th, the suspension busbar voltage is negative
Any point between pole, positive pole or bus is grounded by diode；7th, between the negative pole of the suspension busbar voltage, positive pole or bus
Any point pass through diode string resistance or inductance and be grounded.
5. a kind of photovoltaic system, it is characterised in that adjust dress including the exchange common-mode voltage described in any one of Claims 1-4
Put；The exchange common-mode voltage adjusting means includes active clamp device；The active clamp device is connected on photovoltaic system inversion
The exchange outlet side of device；The active clamp device generates suspension busbar voltage by converting；The suspension busbar voltage ground connection；
The active clamp device controls the suspension busbar voltage with AC common-mode voltage into fixed proportionate relationship, and passes through tune
Save suspension varying DC link voltage AC common-mode voltage；Photovoltaic module negative pole voltage-to-ground is with the AC common-mode voltage variation
And change, complete the suppression to PID effects.
6. photovoltaic system according to claim 5, it is characterised in that the active clamp device uses but is not limited to two electricity
Flat three-phase half-bridge, T-shaped three-level three-phase half-bridge, the level of I types three three-phase half-bridge structure it is any.
7. according to the photovoltaic system described in any one of claim 5 or 6, it is characterised in that the suspension busbar voltage ground connection is adopted
With but be not limited to any of in the following manner：First, any point between the negative pole of the suspension busbar voltage, positive pole or bus connects
Ground；2nd, earth point is taken to be grounded on the derided capacitors at the suspension busbar voltage both ends；3rd, in the suspension busbar voltage two
Earth point is taken to be grounded on the divider resistance at end；4th, earth point is taken to be grounded on the partial pressure inductance at the suspension busbar voltage both ends.
8. photovoltaic system according to claim 7, it is characterised in that negative pole, positive pole or the mother of the suspension busbar voltage
Any point ground connection between line uses but is not limited to any of in the following manner：First, the negative pole of the suspension busbar voltage, positive pole or
Any point between bus is directly grounded；2nd, any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through resistance
Ground connection；3rd, any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through resistance and capacity earth；4th, it is described
Any point between the negative pole of suspension busbar voltage, positive pole or bus is grounded by inductance；5th, the suspension busbar voltage is negative
Any point between pole, positive pole or bus is grounded by inductance string resistance；6th, negative pole, positive pole or the mother of the suspension busbar voltage
Any point between line is grounded by diode；7th, any point between the negative pole of the suspension busbar voltage, positive pole or bus passes through
Diode string resistance or inductance ground connection.
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107492905B (en) | 2020-09-29 |
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