CN106787873A - A kind of power decoupling circuit of AC coupling - Google Patents
A kind of power decoupling circuit of AC coupling Download PDFInfo
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- CN106787873A CN106787873A CN201710115374.1A CN201710115374A CN106787873A CN 106787873 A CN106787873 A CN 106787873A CN 201710115374 A CN201710115374 A CN 201710115374A CN 106787873 A CN106787873 A CN 106787873A
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- 230000003071 parasitic effect Effects 0.000 claims abstract description 14
- 230000001939 inductive effect Effects 0.000 claims description 33
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- 230000005611 electricity Effects 0.000 claims description 7
- 230000005540 biological transmission Effects 0.000 claims description 3
- 230000006837 decompression Effects 0.000 claims description 2
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- 238000004146 energy storage Methods 0.000 description 7
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Classifications
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
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- H02J3/383—
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M7/00—Conversion of ac power input into dc power output; Conversion of dc power input into ac power output
- H02M7/42—Conversion of dc power input into ac power output without possibility of reversal
- H02M7/44—Conversion of dc power input into ac power output without possibility of reversal by static converters
- H02M7/48—Conversion of dc power input into ac power output without possibility of reversal by static converters using discharge tubes with control electrode or semiconductor devices with control electrode
- H02M7/483—Converters with outputs that each can have more than two voltages levels
- H02M7/4835—Converters with outputs that each can have more than two voltages levels comprising two or more cells, each including a switchable capacitor, the capacitors having a nominal charge voltage which corresponds to a given fraction of the input voltage, and the capacitors being selectively connected in series to determine the instantaneous output voltage
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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
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Inverter Devices (AREA)
Abstract
A kind of power decoupling circuit of AC coupling, including inductor, main switching device, parasitic diode and decoupling capacitance.The main switching device is seven switching tubes, every equal one parasitic diode of inverse parallel of switching tube.Power decoupling circuit of the present invention is divided into four mode of operations, i.e. PHC charge modes；PHC discharge modes；NHC charge modes and NHC discharge modes.The input of power decoupling circuit of the present invention is the outlet side for being connected in parallel on inverter, the voltage magnitude of inverter outlet side is high and be positive and negative mechanical periodicity, enable that the decoupling capacitance in the decoupling circuit based on step-up/step-down circuit design obtains average voltage and larger voltage change range higher, the capacitance of decoupling capacitance will be greatly reduced, and the polarity of decoupling capacitance is fixed, need not can just meet grid-connected inverters requirement using big electrochemical capacitor, system bulk and cost are substantially reduced, such that it is able to increase substantially the service life of photovoltaic generating system.
Description
Technical field
The present invention relates to a kind of power decoupling circuit of AC coupling, belong to electrical technology field.
Background technology
In photovoltaic generating system, photovoltaic module by maximum power point tracking (MPPT) control produce it is constant most
It is high-power, and the instantaneous power for being transferred to power network is presented periodically pulsing, this is generally existing in single-phase grid-connected inverter
The unmatched problem of instantaneous power.Generally, using the electrochemical capacitor of Large Copacity as decoupling circuit energy-storage travelling wave tube, but electrolysis electricity
The introducing of appearance shortens the bulk life time of photovoltaic generating system.Position according to decoupling capacitance in photovoltaic generating system is different,
The decoupling of photovoltaic array side can be divided into, dc bus side decouples and exchanges outlet side decoupling.Exchange outlet side decoupling circuit is because solution
Coupling electric capacity both end voltage value is larger, and can allow larger fluctuation, therefore can effectively reduce decoupling capacitance value size, reduces system
Volume so that photovoltaic generating system can replace electrochemical capacitor using long-life thin-film capacitor, extends photovoltaic generating system
Service life.
For AC power decoupled mode, there are many scholars to propose corresponding power decoupling circuit.Li Q and Wolfs
P proposes to be placed on decoupling capacitance between inverter and power network, thus constitutes two-way AC/AC (alternating current) variable-frequency formula inverter topology, but decoupling
The voltage magnitude at electric capacity two ends is limited by line voltage, does not possess stepping functions, and the reduction of decoupling capacitance value is limited.Close
The Chen Zongxiang of fertile polytechnical university proposes that one kind connects power network in A phases, C phases by inductor filter, and passes through inductance L in B phasesbConnection
Power network, from there through two switches and inductance L in B phasesbPower decoupling circuit is constituted, its energy-storage travelling wave tube is inductance Lb.But use
Used as decoupling circuit energy-storage travelling wave tube, its decoupling ability will substantially reduce solution to inductance by inductance value and square determining by electric current
Coupling circuit decoupling ability, if increase inductance value will greatly increase photovoltaic generating system volume again.
The content of the invention
The purpose of the present invention is that, according to the various problems that exchange outlet side decoupling circuit is present, the present invention discloses a kind of friendship
The power decoupling circuit of stream side coupling, few with energy-storage travelling wave tube, capacitance is small, and input range is wide, the characteristics of voltage is adjustable.
Realize that technical scheme is as follows：A kind of power decoupling circuit of AC coupling, including inductor, master are opened
Close device, parasitic diode and decoupling capacitance.The main switching device is seven switching tubes, respectively first switch pipe, second
Switching tube, the 3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube and the 7th switching tube；Every switching tube is anti-
A parasitic diode in parallel；Parasitic diode is seven diodes, respectively the first diode, the second diode, the three or two
Pole pipe, the 4th diode, the 5th diode, the 6th diode and the 7th diode.
The emitter stage of the first switch pipe T1 and the 4th switch transistor T 4 connects the output AC two ends of inverter respectively；
The colelctor electrode of first switch pipe T1 and the 4th switch transistor T 4 connects inductor Lc two ends respectively；While the current collection of first switch pipe T1
Pole is connected with the emitter stage of second switch pipe T2 and the colelctor electrode of the 5th switch transistor T 5；The colelctor electrode and the 6th of the 4th switch transistor T 4
The emitter stage of switch transistor T 6 is connected with the colelctor electrode of second switch pipe T3；The colelctor electrode of second switch pipe T2 and the 6th switch transistor T 6
Colelctor electrode with the 7th switch transistor T 7 is connected；One end of the emitter stage connection decoupling capacitance Cc of the 7th switch transistor T 7；3rd switch
The emitter stage of pipe T3 and the 5th switch transistor T 5 links together, and is connected to the other end of decoupling capacitance Cc；
The power decoupling circuit can realize the two-way flow of power, and the parasitic diode of each switching tube may make up energy stream
Logical path, and need not additionally increase diode；In the power decoupling circuit, electric capacity Cc is realized to photovoltaic DC-to-AC converter output work
The power decoupled effect of the difference of rate and power network instantaneous power, and inductance Lc then realizes the transmission of above-mentioned energy difference.
The power decoupling circuit can be divided into four mode of operations, operation mode 1, i.e. PHC charge modes；Operation mode 2,
That is PHC discharge modes；Operation mode 3, i.e. NHC charge modes；Operation mode 4, i.e. NHC discharge modes.
Operation mode 1：Under operation mode 1, i.e. PHC charge modes, the switch transistor Ts 6 of second switch pipe T2 to the 6th are switched
All off, electric current can be circulated by the second diode D2, the 3rd diode D3 and the 4th diode D4, when first switch pipe
When T1 is opened, the 7th switch transistor T 7 is now disconnection, inductance LcInitial current ip=0, inverter outlet side gives inductance iLCharge,
Inductive current iLGradually increase, the sense of current is inductance storage energy from top to bottom.The driving pulse of regulation first switch pipe T1
Dutycycle is more than 1/2, it is possible to achieve boost mode.Then first switch pipe T1 disconnects, and the 7th switch transistor T 7 is open-minded, inductance LcIt is continuous
Flow and give decoupling capacitance Cc, voltage v on decoupling capacitancecIncrease, inductive current iLIt is gradually decrease until iLWhen=0, the 7th switch transistor T 7
Shut-off, inductance LcThe energy of upper storage is all transferred to electric capacity Cc, realize the PHC charge mode processes of decoupling circuit.
Operation mode 2：Under operation mode 2, i.e. PHC discharge modes, the 5th switch transistor T 5 and the 6th switch transistor T 6 disconnect,
7th switch transistor T 7 disconnects, and first switch pipe T1 disconnects.Second switch pipe T2, the 3rd switch transistor T 3 are simultaneously open-minded, and now the 4th
Switch transistor T 4 disconnects, electric capacity CcGive inductance LcElectric discharge, control second switch pipe T2, the dutycycle of the 3rd switch transistor T 3 are more than 1/2,
It is equivalent to decoupling circuit and is operated in boost mode, electric capacity CcVoltage vcIt is gradually reduced, inductive current iLGradually increase since 0,
The sense of current is for from bottom to top, inductance obtains part energy from electric capacity；Then second switch pipe T2, the 3rd switch transistor T 3
Simultaneously switch off, the 4th switch transistor T 4 is open-minded, inductance LcGive the electric discharge of inverter outlet side, inductive current iLIt is gradually reduced until iL=0
When, the 4th switch transistor T 4 is turned off, inductance LcThe energy of upper storage is all shifted to inverter outlet side, realizes decoupling circuit
PHC discharge mode processes.
Operation mode 3：Under operation mode 3, i.e. NHC charge modes, second switch pipe T2 and the 3rd switch transistor T 3 disconnect,
5th switch transistor T 5 and the 6th switch transistor T 6 disconnect, and first switch pipe T1 disconnects.4th switch transistor T 4 is open-minded, the 7th switch transistor T 7
During disconnection, inductance LcInitial current ip=0, inverter outlet side gives inductance LcCharge, inductive current iLGradually increase, electric current side
To for from bottom to top, inductance storage energy.The dutycycle of the 4th switch transistor T 4 is controlled to be more than 1/2, it is possible to achieve boost mode.So
The 4th switch transistor T 4 disconnects afterwards, and the 7th switch transistor T 7 is open-minded, inductance LcDecoupling capacitance C is given in afterflowc, voltage v on decoupling capacitancecIncrease
Greatly, inductive current iLIt is gradually decrease until iLWhen=0, the 7th switch transistor T 7 is turned off, inductance LcThe energy of upper storage is all transferred to
Electric capacity Cc, realize the NHC charge mode processes of decoupling circuit.
Operation mode 4：Under operation mode 4, i.e. NHC discharge modes, second switch pipe T2 and the 3rd switch transistor T 3 disconnect,
4th switch transistor T 4 disconnects, and the 7th switch transistor T 7 disconnects.5th switch transistor T 5 and the 6th switch transistor T 6 are simultaneously open-minded, and now first
Switch transistor T 1 disconnects, electric capacity CcGive inductance LcElectric discharge, the 5th switch transistor T 5 of control, the dutycycle of the 6th switch transistor T 6 are more than 1/2,
It is equivalent to decoupling circuit and is operated in decompression mode, electric capacity CcVoltage vcIt is gradually reduced, inductive current iLGradually increase since 0,
The sense of current is for from top to bottom, inductance obtains part energy from electric capacity；Then the 5th switch transistor T 5, the 6th switch transistor T 6
Simultaneously switch off, T1 is open-minded for first switch pipe, inductance LcGive the electric discharge of inverter outlet side, inductive current iLIt is gradually reduced until iL=0
When, first switch pipe T1 shut-offs, inductance LcThe energy of upper storage is all shifted to inverter outlet side, realizes decoupling circuit
NHC discharge mode processes.
The beneficial effects of the invention are as follows the input of power decoupling circuit of the present invention is the outlet side for being connected in parallel on inverter
, the voltage magnitude of inverter outlet side is high and be positive and negative mechanical periodicity so that the decoupling circuit based on step-up/step-down circuit design
In decoupling capacitance can obtain average voltage and larger voltage change range higher, the electricity of decoupling capacitance will be greatly reduced
Capacitance, and the polarity of decoupling capacitance is fixed, can just meet grid-connected inverters requirement without using big electrochemical capacitor, significantly
System bulk and cost are reduced, such that it is able to increase substantially the service life of photovoltaic generating system.Power decoupled electricity of the present invention
Road be Two-port netwerk circuit in parallel in inverter ac outlet side, compared with the decoupling circuit of three port types, can be with modular
In form input photovoltaic generating system, it is easy to safeguard.
Brief description of the drawings
Fig. 1 is the power decoupling circuit schematic diagram of AC parallel coupled of the present invention；
Fig. 2 is the equivalent circuit and current loop schematic diagram of PHC charge modes；
Fig. 3 is inductive current waveform and capacitance voltage oscillogram under PHC charge modes；
Fig. 4 is the equivalent circuit and current loop schematic diagram of PHC discharge modes；
Fig. 5 is inductive current waveform and capacitance voltage oscillogram under PHC discharge modes；
Fig. 6 is the equivalent circuit and current loop schematic diagram of NHC charge modes；
Fig. 7 is the equivalent circuit and current loop schematic diagram of NHC discharge modes；
Inductance L when Fig. 8 is PHC charge modescDischarge and recharge and electric capacity CcCharging process；
Inductance L when Fig. 9 is PHC discharge modescDischarge and recharge and electric capacity CcDischarge process；
Inductance L when Figure 10 is NHC charge modescDischarge and recharge and electric capacity CcCharging process；
Inductance L when Figure 11 is NHC discharge modescDischarge and recharge and electric capacity CcDischarge process；
Figure 12 is inductance LcElectric current and electric capacity CcVoltage；
Figure 13 is photovoltaic generating system photovoltaic output current and grid-connected inverters electric current, grid-connected voltage waveform.
Specific embodiment
The specific embodiment of the invention is as shown in drawings.Fig. 1 is the power decoupled electricity of the present embodiment AC parallel coupled
Road schematic diagram.
The present embodiment power decoupling circuit includes：Including inductor, main switching device, parasitic diode and decoupling capacitance.
Inductor is Lc；Main switching device is seven switching tubes, i.e. first switch pipe T1, second switch pipe T2, the 3rd switch transistor T 3, the
Four switch transistor Ts 4, the 5th switch transistor T 5, the 6th switch transistor T 6 and the 7th switch transistor T 7；Parasitic diode is seven diodes, i.e.,
First diode D1, the second diode D2, the 3rd diode D3, the 4th diode D4, the 5th diode D5, the 6th diode D6
With the 7th diode D7；Decoupling capacitors are Cc.
Due to the influence of production technology, every equal one parasitic diode of inverse parallel of main switching device.Specific connected mode
It is, the emitter stage of the positive pole connecting valve pipe of diode, the colelctor electrode of the negative pole connecting valve pipe of diode.
The emitter stage of first switch pipe T1 and the 4th switch transistor T 4 connects the output of the inverter based on Hysteresis control respectively
AC two ends；The colelctor electrode of first switch pipe T1 and the 4th switch transistor T 4 connects inductor Lc two ends respectively；First open simultaneously
The colelctor electrode for closing pipe T1 is connected with the emitter stage of second switch pipe T2 and the colelctor electrode of the 5th switch transistor T 5；4th switch transistor T 4
Colelctor electrode is connected with the emitter stage of the 6th switch transistor T 6 and the colelctor electrode of the 3rd switch transistor T 3；The switches of second switch pipe T2 and the 6th
The colelctor electrode of pipe T6 is connected with the colelctor electrode of the 7th switch transistor T 7；The one of the emitter stage connection decoupling capacitance Cc of the 7th switch transistor T 7
End；The emitter stage of the 3rd switch transistor T 3 and the 5th switch transistor T 5 links together, and is connected to the other end of decoupling capacitance Cc.Its advantage
The two-way flow of power is can be achieved on, as shown in Figure 1.The parasitic diode of each switching tube may make up the road of energy flux in figure
Footpath, and need not additionally increase diode.In circuit, electric capacity Cc realize to photovoltaic DC-to-AC converter power output and power network instantaneous power it
Poor power decoupled effect, and inductance Lc then realizes the transmission of above-mentioned energy difference.
Fig. 2 show equivalent circuit and electricity of the present embodiment power decoupling circuit in operation mode 1, i.e. PHC charge modes
Stream circulation path, u in figureoutIt is the inverter output AC square-wave voltage value of hysteretic loop current control, iLIt is inductor current value, when
When first switch pipe T1 switching tubes are turned on, ON time is defined as dtr, then the stage meet formulaOpen when first
Close the 7th switch transistor T 7 when pipe T1 is turned off to turn on, if the ON time of the 7th switch transistor T 7 is dtf, when the 7th switch transistor T 7 is turned on
It is u to carve electric capacity Cc voltagesc1, shut-off moment electric capacity Cc of the 7th switch transistor T 7 voltage is uc2, between voltage difference be duc, the stage
Electric current on electric capacity
Under PHC charge modes, the unnecessary energy that photovoltaic generating system is produced will be stored in the electric capacity of decoupling circuit.
Fig. 3 show the inductive current L under PHC charge modescWith filter capacitor voltage uCChange curve, wherein t1-t2Interval is work
When making that first switch pipe T1 is turned in mode 1, t2-t3Interval is first switch pipe T1 closings, the 7th switching tube in operation mode 1
When T7 is turned on, t3-t4For the 7th switch transistor T 7 closes the time interval to the conductings of first switch pipe T1 next time.
In t shown in figure1-t2Interval, iL1From t1When I0Rise to t2When I1, it is the induction charging energy storage stage, it is now electric
Feeling the energy obtained from inverter outlet side is, while there is the relation of inductive current and its both end voltageWherein,
And capacitance voltage uCIt is u that this stage maintains constant in the ideal case0。
In t2-t3Interval is inductive discharge, and capacitance energy storage stage, the energy that now electric capacity is obtained is equal to t1-t2Electricity in interval
Feel the energy of storage, i.e. while electric current on the stage electric capacityWherein, illustrate under operation mode 1 as inductance fills
The process that electric energy storage and inductance energy are shifted to electric capacity.
Fig. 4 show the discharge loop and current loop of the operation mode 2 of the present embodiment, i.e. PHC discharge modes.
Under PHC discharge modes, the not enough energy of photovoltaic generating system will be obtained from the electric capacity of decoupling circuit.Fig. 5 institutes
It is shown as the inductive current i under PHC charge modesLWith filter capacitor voltage ucChange curve, wherein t1-t2Interval is Working mould
After the 4th switch transistor T 4 is turned off in state 2, before second switch pipe T2, the 3rd switch transistor T 3 are turned on, t2-t3Interval is operation mode 2
In the 4th switch transistor T 4 turn off, second switch pipe T2, the 3rd switch transistor T 3 turn on when, t3-t4For the 4th switch transistor T 4 is turned on, the
When two switch transistor Ts 2, the 3rd switch transistor T 3 are turned off, t4-t5Second switch pipe T2, the 3rd next time after being turned off for the 4th switch transistor T 4
Before switch transistor T 3 is turned on.
In t shown in Fig. 52-t3Interval, iL1From t2When I0Reversely increase to t3When I1, it is that decoupling capacitance discharges to inductance
Stage, capacitance voltage uCFrom u0It is reduced to u1, now inductance from decoupling capacitance obtain energy, while there is decoupling capacitance discharge current
Relation
In t3-t4Interval is inductive discharge to the inverter outlet side stage, and now inductance is exported and is equal to the energy of inverter
t2-t3The energy of inductance storage in interval, while voltage meets relation on the stage inductanceWherein, work is illustrated
Make under mode 2 as electric capacity discharges the process shifted to inverter outlet side to inductance and inductance energy.
Fig. 6 show the equivalent circuit and current loop of the operation mode 3 of the present embodiment, i.e. NHC charge modes.
Fig. 7 show the equivalent circuit and current loop of the operation mode 4 of the present embodiment, i.e. NHC charge and discharge modes.
In operation mode 3 and operation mode 4, between inverter outlet side is in line voltage negative half-cycle, but inductance electricity
The waveform analysis process of stream and capacitance voltage is similar with operation mode 1,2.
Fig. 8 show the present embodiment in operation mode 1, and inverter outlet side is in the positive half cycle of line voltage, uout=
Under conditions of 400V, inductance LcCharging, the waveform of discharge process and electric capacity CcCharging energy-storing process.Fig. 8 distinguishes table from top to bottom
Show that curve 1 is decoupling circuit inductance LcElectric current (unit：A), curve 2 is electric capacity CcVoltage (unit：V), curve 3 is first to open
The drive signal of pipe T1 is closed, curve 4 is the drive signal of the 7th switch transistor T 7.When first switch pipe T1 is closed, decoupling circuit
Inductance be in charging process, while with uoutThe linear velocity of/L1 increases, and now capacitance voltage keeps constant.Work as first switch
Pipe T1 disconnects, when the 7th switch transistor T 7 is closed, decoupling circuit inductive discharge, while electric capacity CcCharging process is in, now electric capacity
Voltage increases.
Fig. 9 show the present embodiment in operation mode 2, and inverter outlet side is in the positive half cycle of line voltage, uout=
Under conditions of 400V, inductance LcCharging, the waveform of discharge process and electric capacity CcDischarge process.Fig. 9 represents bent respectively from top to bottom
Line 1 is decoupling circuit inductance LcElectric current (unit：A), curve 2 is electric capacity CcVoltage (unit：V), curve 3 is second switch pipe
The drive signal of T2, the 3rd switch transistor T 3, curve 4 is the drive signal of the 4th switch T4 pipes.When second switch pipe T2, the 3rd open
When closing pipe T3 closures, the electric capacity of decoupling circuit is in discharge process, and capacitance voltage is reduced, and now inductive current reversely increases.When
Second switch pipe T2, the 3rd switch transistor T 3 disconnect, and when the 4th switch transistor T 4 is closed, decoupling circuit inductive discharge discharges energy
Inverter outlet side is given, inductive current reduction, now capacitance voltage holding is constant.
Figure 10 show the present embodiment in operation mode 3, in line voltage negative half period, u at inverter outlet sideout
Under conditions of=400V, inductance LcCharging, the waveform of discharge process and electric capacity CcCharging energy-storing process.Figure 10 divides from top to bottom
Not Biao Shi curve 1 be decoupling circuit inductance LcElectric current (unit：A), curve 2 is electric capacity CcVoltage (unit：V), curve 3 is
The drive signal of four switch transistor Ts 4, curve 4 is the drive signal of the 7th switch transistor T 7.When the 4th switch transistor T 4 is closed, decoupling
The inductance of circuit is in charging process, and inductive current reversely increases, while uoutThe linear velocity of/L1 increases, now capacitance voltage
Keep constant.When the 4th switch transistor T 4 disconnects, when the 7th switch transistor T 7 is closed, decoupling circuit inductive discharge, inductive current reduction
While electric capacity CcCharging process is in, now capacitance voltage increases.
It is the present embodiment in operation mode 4 that Figure 11 is shown, in line voltage negative half period at inverter outlet side,
uoutUnder conditions of=400V, inductance LcCharging, the waveform of discharge process and electric capacity CcDischarge process.Figure 11 distinguishes from top to bottom
Represent that curve 1 is decoupling circuit inductance LcElectric current (unit：A), curve 2 is electric capacity CcVoltage (unit：V), curve 3 is the 5th
The drive signal of switch transistor T 5, the 6th switch transistor T 6, curve 4 is the drive signal of first switch pipe T1.When the 5th switch transistor T 5,
When 6th switch transistor T 6 is closed, the electric capacity of decoupling circuit is in discharge process, capacitance voltage reduction, now inductive current increase.
When the 5th switch transistor T 5, the 6th switch transistor T 6 disconnect, when first switch pipe T1 is closed, decoupling circuit inductive discharge releases energy
Put and give inverter outlet side, inductive current reduction, now capacitance voltage holding is constant.
Figure 12 show the present embodiment photovoltaic system photovoltaic side output voltage be 240V under conditions of, inductance LcCharge,
The waveform and electric capacity C of discharge processcCharge and discharge process waveform.Figure 11 represents that curve 1 is decoupling circuit respectively from top to bottom
Inductance LcElectric current (unit：A), curve 2 is electric capacity CcVoltage (unit：V).
It is 240V that Figure 13 show the present embodiment in photovoltaic generating system photovoltaic side output voltage, photovoltaic generating system is born
Carry as under conditions of 550W resistive loads, photovoltaic generating system photovoltaic side output current, the grid-connected voltage of inverter outlet side
With grid-connected current waveform.Figure 13 represents that curve 1 is photovoltaic generation system when the present embodiment decoupling circuit works respectively from top to bottom
System photovoltaic side output current (unit：A), curve 2 is the photovoltaic generating system when power decoupling circuit of the present embodiment does not work
Photovoltaic side output current (unit：A), curve 3 is the grid-connected current (unit of photovoltaic generating system inverter outlet side：A), curve
4 is the grid-connected voltage (unit of photovoltaic generating system inverter outlet side：V).By correlation curve 1 and curve 2, this implementation
When the power decoupling circuit of example works, photovoltaic generating system photovoltaic side output current is maintained at 2.8A narrow fluctuations up and down, and originally
When the power decoupling circuit of embodiment does not work, photovoltaic generating system photovoltaic side output current fluctuation between 0-10A, this
The fluctuation of sample will have a strong impact on the operating efficiency of photovoltaic generating system.
It is soft using specialty emulation in order to verify the Mathematical Modeling of the power decoupling circuit of the present embodiment and the correctness of analysis
Part Matlab R2014a are emulated, and, using the PWM technologies based on pulse energy control (PEM), simulation parameter is such as control strategy
Shown in following table, simulation result is shown in Fig. 8 to Figure 13.
Table simulation parameter
| Parameter | Size |
| Line voltage peak value, ugrid.pk(V) | 311 |
| Inverter output voltage, uout(V) | 400 |
| Electric capacity, Cc(μF) | 20 |
| Inductance, Lc(μH) | 200 |
Simulation result shows, using the photovoltaic generating system of the power decoupling circuit of the present embodiment, the total electric capacity of its system
Amount will be greatly reduced, and be capable of achieving micro- inversion transformation technique of no electrolytic capacitor, then illustrate the feasibility of the power decoupling circuit.
Claims (6)
1. the power decoupling circuit of a kind of AC coupling, it is characterised in that the circuit include inductor, main switching device,
Parasitic diode and decoupling capacitance；The main switching device be seven switching tubes, respectively first switch pipe, second switch pipe,
3rd switching tube, the 4th switching tube, the 5th switching tube, the 6th switching tube and the 7th switching tube；Every equal inverse parallel one of switching tube
Individual parasitic diode；Parasitic diode is seven diodes, respectively the first diode D1, the second diode D2, the three or two pole
Pipe D3, the 4th diode D4, the 5th diode D5, the 6th diode D6 and the 7th diode D7；
The emitter stage of the first switch pipe and the 4th switching tube connects the output AC two ends of inverter respectively；First switch
The colelctor electrode of pipe and the 4th switching tube connects inductor two ends respectively；While the colelctor electrode of first switch pipe and second switch pipe
The colelctor electrode of emitter stage and the 5th switching tube is connected；The colelctor electrode of the 4th switching tube is opened with the emitter stage of the 6th switching tube and second
The colelctor electrode for closing pipe is connected；The colelctor electrode of second switch pipe and the 6th switching tube is connected with the colelctor electrode of the 7th switching tube；7th
The emitter stage of switching tube connects one end of decoupling capacitance；The emitter stage of the 3rd switching tube and the 5th switching tube links together, and connects
To the other end of decoupling capacitance；
The power decoupling circuit is divided into four mode of operations, operation mode 1, i.e. PHC charge modes；Operation mode 2, i.e. PHC
Discharge mode；Operation mode 3, i.e. NHC charge modes；Operation mode 4, i.e. NHC discharge modes.
2. the power decoupling circuit that a kind of AC according to claim 1 is coupled, it is characterised in that the power decoupled
Circuit can realize the two-way flow of power, and the parasitic diode of each switching tube may make up the path of energy flux；The power solution
In coupling circuit, electric capacity is realized acting on the power decoupled of photovoltaic DC-to-AC converter power output and the difference of power network instantaneous power, and inductance
Then realize the transmission of above-mentioned energy difference.
3. the power decoupling circuit that a kind of AC according to claim 1 is coupled, it is characterised in that the operation mode
1, under PHC charge modes, the switching tubes of second switch Guan Zhi six switch it is all off, electric current can by the second diode,
3rd diode and the 4th diode circulate, and when first switch pipe is opened, the 7th switching tube is now disconnection, inductance LcInitially
Electric current ip=0, inverter outlet side gives inductance LcCharge, inductive current iLGradually increase, the sense of current is inductance from top to bottom
Storage energy；The driving pulse dutycycle for adjusting first switch pipe is more than 1/2, it is possible to achieve boost mode；Then first switch
Pipe disconnects, and the 7th switching tube is open-minded, inductance afterflow to decoupling capacitance, voltage v on decoupling capacitancecIncrease, inductive current iLGradually drop
It is low until iLWhen=0, the 7th switching tube shut-off, the energy stored on inductance is all transferred to electric capacity, realizes the PHC of decoupling circuit
Charge mode process.
4. the power decoupling circuit that a kind of AC according to claim 1 is coupled, it is characterised in that the operation mode
2, under PHC discharge modes, the 5th switching tube and the 6th switching tube disconnect, and the 7th switching tube disconnects, and first switch pipe disconnects；The
Two switching tubes, the 3rd switching tube are simultaneously open-minded, and now the 4th switching tube disconnects, electric capacity to inductive discharge, control second switch pipe,
The dutycycle of the 3rd switching tube is more than 1/2, is equivalent to decoupling circuit and is operated in boost mode, the voltage v of electric capacitycIt is gradually reduced,
Inductive current iLGradually increase since 0, the sense of current is for from bottom to top, inductance obtains part energy from electric capacity；So
Second switch pipe, the 3rd switching tube are simultaneously switched off afterwards, and the 4th switching tube is open-minded, and inductance discharges to inverter outlet side, inductance electricity
Stream iLIt is gradually reduced until iLWhen=0, the 4th switching tube shut-off, the energy stored on inductance is all shifted to inverter outlet side,
Realize the PHC discharge mode processes of decoupling circuit.
5. the power decoupling circuit that a kind of AC according to claim 1 is coupled, it is characterised in that the operation mode
3, under NHC charge modes, second switch pipe and the 3rd switching tube disconnect, and the 5th switching tube and the 6th switching tube disconnect, and first
Switching tube disconnects；4th switching tube is open-minded, when the 7th switching tube disconnects, inductance LcInitial current ip=0, inverter outlet side is given
Induction charging, inductive current iLGradually increase, the sense of current is inductance storage energy from bottom to top；Control the 4th switching tube
Dutycycle is more than 1/2, it is possible to achieve boost mode；Then the 4th switching tube disconnects, and the 7th switching tube is open-minded, and inductance afterflow is to solution
Coupling electric capacity, voltage v on decoupling capacitancecIncrease, inductive current iLIt is gradually decrease until iLWhen=0, the shut-off of the 7th switching tube, inductance
The energy of upper storage is all transferred to electric capacity, realizes the NHC charge mode processes of decoupling circuit.
6. the power decoupling circuit that a kind of AC according to claim 1 is coupled, it is characterised in that the operation mode
4, under NHC discharge modes, second switch pipe and the 3rd switching tube disconnect, and the 4th switching tube disconnects, and the 7th switching tube disconnects；The
Five switching tubes and the 6th switching tube are simultaneously open-minded, and now first switch pipe disconnects, and electric capacity is switched to inductive discharge, control the 5th
Pipe, the dutycycle of the 6th switching tube are more than 1/2, are equivalent to decoupling circuit and are operated in decompression mode, the voltage v of electric capacitycGradually subtract
It is small, inductive current iLGradually increase since 0, the sense of current is for from top to bottom, inductance obtains part energy from electric capacity；
Then the 5th switching tube, the 6th switching tube are simultaneously switched off, and first switch pipe is open-minded, and inductance discharges to inverter outlet side, inductance
Electric current iLIt is gradually reduced until iLWhen=0, first switch pipe shut-off, the energy stored on inductance all turns to inverter outlet side
Move, realize the NHC discharge mode processes of decoupling circuit.
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| CN107508479B (en) * | 2017-08-01 | 2024-01-30 | 华东交通大学 | Four-switch alternating-current side power decoupling circuit and decoupling control method |
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| CN106787873B (en) | 2023-06-30 |
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Effective date of registration: 20231110 Address after: 272000 Huling Second Road, North Shou Road West, North 1st Ring Road North, Yutai County, Jining City, Shandong Province Patentee after: YUTAI POWER SUPPLY COMPANY OF STATE GRID SHANDONG ELECTRIC POWER CO. Address before: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee before: Dragon totem Technology (Hefei) Co.,Ltd. Effective date of registration: 20231110 Address after: 230000 floor 1, building 2, phase I, e-commerce Park, Jinggang Road, Shushan Economic Development Zone, Hefei City, Anhui Province Patentee after: Dragon totem Technology (Hefei) Co.,Ltd. Address before: 330031 No. 808 Shuanggang East Street, Nanchang Economic and Technological Development Zone, Jiangxi Province Patentee before: East China Jiaotong University |