CN100433525C - Soft switch back exciting converter used for solar energy photovoltaic generation incorporate in power network - Google Patents
Soft switch back exciting converter used for solar energy photovoltaic generation incorporate in power network Download PDFInfo
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- CN100433525C CN100433525C CNB2006100103893A CN200610010389A CN100433525C CN 100433525 C CN100433525 C CN 100433525C CN B2006100103893 A CNB2006100103893 A CN B2006100103893A CN 200610010389 A CN200610010389 A CN 200610010389A CN 100433525 C CN100433525 C CN 100433525C
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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
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
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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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Abstract
This invention relates to solar volt flexible switch reverser, which belongs to solar volt power generation technique field, which exerts direct voltage of the solar energy board into input capacitor two ends, wherein, input capacity end is connected to second induction end; other end of second induction is connected to integration electrode and first capacitor end; the first capacitor other end is connected to the encode end of third, second tubes and emission electrode of thirst control switch.
Description
Technical field
The invention belongs to the solar photovoltaic grid-connection technical field of power generation, be specifically related to a kind of soft switch back exciting converter that photovoltaic (Photovoltaic is called for short PV) generates electricity by way of merging two or more grid systems that can be used for.
Background technology
Along with going from bad to worse and the requirement of human kind sustainable development of the growth of traditional energy consumption, biological environment, countries in the world are all at the pollution-free reproducible new forms of energy of active development.Solar energy resources is abundant, and is widely distributed, can regenerate, free from environmental pollution, makes solar energy power generating become the main flow in the new energy development.Photovoltaic DC-to-AC converter is the core in the photovoltaic generating system, and the height of its efficient, the quality of reliability will directly influence the performance and the investment of whole photovoltaic system.In traditional photovoltaic generating system, organize optical-electric module composition PV array more and obtain sufficiently high direct current (DC) bus voltage, produce interchange (AC) voltage by the inverter inversion again and be connected to the grid.But because the blocking of barriers such as the variation of intensity of solar radiation and nearby buildings, trees, the gross output of PV array has obvious variation.For photovoltaic system is always worked on the maximum power point, the notion of AC module is suggested.In this AC modular system, inverter of every group of optical-electric module assembling forms an AC module, and the output-parallel of these AC modules inserts electrical network again.This AC module inverter is at separately optical-electric module, self finish boost, function such as MPPT maximum power point tracking (MPPT) and inversion.Many inverter topology and corresponding control strategies thereof that are used for parallel network power generation are in the news, and are the typical case with Buck-Boost inverter and back exciting converter wherein, have obtained very big development.Four or five switches of Buck-Boost inverter employing are realized boosting and inversion, back exciting converter adopts three switches, though they can realize inversion and electrical isolation, these two kinds of structures all adopt high frequency switch mode, produce a large amount of switching losses, made system effectiveness reduce.For example, be illustrated in figure 1 as traditional back exciting converter, it adopts three-winding transformer as energy storage and isolated component, by switch S only with three switches
1The waveform of control output current, switch S
2And S
3The polarity of control output current, the shortcoming of this inverter is S
1With the high frequency hard switching, loss is very big, has limited its practical application, and the very big electrochemical capacitor of direct current input side parallel connection, and the volume that this has increased whole device has shortened useful life of system.Be illustrated in figure 2 as the inverse-excitation type combining inverter in a kind of AC of being applicable to module, it has increased a flat wave circuit on the circuit base of classical inverse exciting converter, power pulsations is transferred on the non-electrolytic capacitor C of low capacity, and the flat wave capacitor capacity of DC side is reduced greatly, prolonged lifetime of system, though the increase of flat wave circuit has improved power decoupled, but two HF switch of input side are all turn-offed firmly, the back exciting converter that its switching loss is more traditional is bigger, and the efficient of system also reduces greatly.Be illustrated in figure 3 as a kind of soft switching inverter topological structure based on the high frequency anti exciting converter, its system loss is lower, and efficient is higher; But its structure can not be improved power decoupled, and DC side still needs jumbo electrochemical capacitor in parallel, and this has limited its useful life.In sum, up to the present also do not have a kind of topology can realize the power decoupled of soft switch and improvement simultaneously, and these two kinds of functions are obviously most important to single-phase PV inverter.Therefore, press for a kind of novel inverter, except realizing inversion and electrical isolation, also should have following two kinds of functions: reduce switching loss and improve power decoupled.
Summary of the invention
In order to solve the problem that the existing inverter that is used for the solar photovoltaic grid-connection generating can't improve switching loss and power decoupled simultaneously, the invention provides a kind of soft switch back exciting converter that is used for the solar photovoltaic grid-connection generating.
Soft switch back exciting converter of the present invention comprises switching tube drive circuit 1, solar panel photovoltaic array PV, anti-violent change depressor T, the first controlled tr tube S3, the second controlled tr tube S4, the 3rd controlled tr tube S2, the first diode D3, the second diode D4, output capacitance C3 and first inductance L
fSolar panel photovoltaic array PV is positioned at the same side of the former limit winding L 2 of anti-violent change depressor T, the non-same polarity of secondary first winding L 3 of anti-violent change depressor T connects the collector electrode of the first controlled tr tube S3, the emitter of the first controlled tr tube S3 connects the positive terminal of the first diode D3, and the negative pole end of the first diode D3 connects first inductance L
fAn end, the end of output capacitance C3 and the positive terminal of the second diode D4, the negative pole end of the second diode D4 connects the collector electrode of the second controlled tr tube S4, the emitter of the second controlled tr tube S4 connects the end of the same name of secondary second winding L 4 of anti-violent change depressor T, and the non-same polarity of secondary second winding L 4 of anti-violent change depressor T connects the end of the same name of secondary first winding L 3 of anti-violent change depressor T and the other end of output capacitance C3; Described soft switch back exciting converter also comprises input capacitance C1, second inductance L 1, first capacitor C 2, second capacitor C
S1, the 3rd capacitor C
S2, the 4th controlled tr tube S1, the 3rd diode D1 and the 4th diode D2, the direct voltage v of solar panel photovoltaic array PV input
sBe applied to the two ends of input capacitance C1, the end of input capacitance C1 connects an end of second inductance L 1, the other end of second inductance L 1 connects the collector electrode of the 4th controlled tr tube S1 and an end of first capacitor C 2, and the other end of first capacitor C 2 connects positive terminal, the emitter of the 3rd controlled tr tube S2, second capacitor C of the 3rd diode D1
S1An end and the 3rd capacitor C
S2An end, the collector electrode of the 3rd controlled tr tube S2 connects negative pole end and the 3rd capacitor C of the 4th diode D2
S2The other end, the positive terminal of the 4th diode D2 connects the non-same polarity and second capacitor C of the former limit winding L 2 of anti-violent change depressor T
S1The other end, the end of the same name of the former limit winding L 2 of anti-violent change depressor T connects the negative pole end of the 3rd diode D1, the emitter of the 4th controlled tr tube S1 and the other end of input capacitance C1, the output of four drive signals of switching tube drive circuit 1 connects the grid of the described first controlled tr tube S3, the second controlled tr tube S4, the 3rd controlled tr tube S2, the 4th controlled tr tube S1, the output capacitance C3 and first inductance L respectively
fOther end output AC voltage v
oBe connected to the grid.The described first controlled tr tube S3, the second controlled tr tube S4, the 3rd controlled tr tube S2, the 4th controlled tr tube S1 adopt the IGBT switching tube, the 4th controlled tr tube S1 and the 3rd controlled tr tube S2 are the HF switch pipe, switching frequency and can adopt the switching tube of reversal connection diode in 10K to 100KHZ scope; The first controlled tr tube S3 and the second controlled tr tube S4 are the power frequency switching tube.Described input capacitance C1, first capacitor C, 2, the second capacitor C
S1An end and the 3rd capacitor C
S2The polarity free capacitor that the capacity that is is very little.
As shown in Figure 4, the present invention combines Sepic converter and traditional back exciting converter, obtains having the novel PV inverter of the power decoupled two big functions of soft switch and improvement.Extremely shown in Figure 10 as following table 1 and Fig. 5, according to the running status of four switching tubes (S1, S2, S3, S4) and the positive and negative situation of output current, circuit has following six kinds of effective mode of operations.
Six kinds of mode of operation comparative illustration of table 1
| Mode | S1 | S2 | S3 | S4 | i L2 | i L3 | i L4 | i C2 | i 2 | i o |
| 1 | 1 | 1 | 0 | 0 | × | 0 | 0 | i L2 | 0 | × |
| 2 | 1 | 0 | 1 | 0 | 0 | × | 0 | 0 | i L3 | + |
| 3 | 1 | 0 | 0 | 1 | 0 | 0 | × | 0 | i L4 | - |
| 4 | 0 | 0 | 1 | 0 | 0 | × | 0 | i L2 | i L3 | + |
| 5 | 0 | 0 | 0 | 1 | 0 | 0 | × | i L1 | i L4 | - |
| 6 | 0 | 0 | 0 | 0 | 0 | 0 | 0 | i L1 | 0 | × |
(go up in the table, " 1 " expression conducting, the shutoff or the size of current of " 0 " expression switching tube are zero, and " * " expression is invalid, and "+" expression electric current is greater than zero, and "-" expression electric current is less than zero.)
Pattern one: as Fig. 5, the 4th controlled tr tube S1 and the 3rd controlled tr tube S2 are open-minded under this pattern, and the first controlled tr tube S3 and the second controlled tr tube S4 turn-off, because input voltage v
sDirectly be added on second inductance L 1 input current i
1Linear growth, voltage v on first capacitor C 2
C2Also the former limit winding L 2 of anti-violent change depressor T is charged the feasible current i that flows through L2
L1Also linear growth.
Pattern two: as Fig. 6, S1 and S3 are open-minded, and S2 and S4 turn-off, because S1 is still open-minded, so input current i
1Still linear growth, S2 turn-offs, and makes to flow through current i on C2 and the L2
C2And i
L2Be 0.In this process, S3 is open-minded, and S4 turn-offs, so output current i
oGreater than 0.
Pattern three: as Fig. 7, S1 and S4 are open-minded, and S2 and S3 turn-off, and this process and pattern two are similar, and different is output current i
oLess than 0.
Pattern four: as Fig. 8, S1, S2 and S4 turn-off, and have only S3 open-minded, and input voltage and inductance L 1 be all to capacitor C 2 charging, simultaneously because switch S 3 is open-minded, make output current i
oGreater than 0.
Pattern five: as Fig. 9, switching tube S1, S2 and S3 turn-off, and have only S4 open-minded, input voltage v
sWith L1 all to C2 charging, simultaneously because S4 is open-minded, make output current i
oLess than 0.
Pattern six: as Figure 10, four switching tubes all turn-off, with pattern four and pattern sample on May Day, input voltage v
sAll C2 is charged with L1, C3 provides electric current to electrical network by output capacitance.
For single-phase inverter proposed by the invention, when working in unity power factor, its AC side voltage and current can be expressed as follows:
v
o＝V
osinω
ot (1)
i
o＝I
osinω
ot (2)
Thereby, just exist a large amount of power pulsations to be in the circuit:
P
o＝V
oI
o(1-cos2ω
ot)(3)
In the following formula, ω
oBe the frequency of alternating voltage, V
oBe the amplitude of AC side voltage, I
oAmplitude for ac-side current.
In order to make output current is sinusoidal, must make that the current peak envelope that flows through L2 is a sinusoidal waveform.By following formula as can be known, in inverter of the present invention, contain low frequency (2 frequency multiplication) component in the power, this wave component has been transferred on first capacitor C 2, thereby makes the voltage on the direct current input capacitance C1 remain unchanged, and to make the capacity of C1 be a very little value.Because the voltage on the C2 fluctuates with the frequency that doubles power frequency on certain direct current biasing, this just makes pwm signal duty ratio that drives the 3rd controlled tr tube S2 and the electric current that flows through L2 be non-linear relation, so the present invention adopts the peak current control method that S2 is controlled.Described peak current control method is meant: as shown in figure 12, flow through the current i of L2
L2Detect by current sensor, when S2 opens, i
L2Increase, work as current i
L2When being increased to the sinusoidal reference value, the output low level drive signal is turn-offed S2, so just can guarantee i
L2Current peak accurately follow the tracks of the sinusoidal reference value all the time, thereby control output current i
oSinusoidal waveform for standard.Certainly, the present invention also can adopt other controlling schemes that S2 is controlled, as passing through to detect the voltage on the C2, obtain the duty ratio of each switch periods through computing, the output driving pulse, thus control finished to S2, but implement the complexity of comparing with the peak current controlling schemes.The 4th controlled tr tube S1 is controlling input current i
oSize, thereby determined the size of intake.In order to follow the tracks of the maximum power of PV battery, need to guarantee the input constant energy, this just requires S1 with fixed duty cycle work.Consider the effective operating state of circuit, S1 and S2 should be open-minded simultaneously, and the duty ratio of S2 Continuity signal must be less than the duty ratio of S1 Continuity signal.The first controlled tr tube S3 and the second controlled tr tube S4 are controlling output current i
oPolarity, the two alternately turns on and off in the power frequency positive and negative half period, thereby obtains the output current i of positive and negative both direction
o
In the structure of the present invention, the soft switch operation of HF switch S1 and S2 is by parasitic capacitance on the 3rd controlled tr tube S2 and the 4th diode D2 and second capacitor C of being introduced
S1With the 3rd capacitor C
S2(as shown in Figure 4) of realizing.As shown in figure 11, provided the voltage current waveform on S1 and the S2, S1 and S2 conducting simultaneously, the electric current on it is from 0 linear growth, and therefore two switches are all soft open-minded with zero current (ZCS).When S2 turn-offed, the electric current on the L2 did not pass to secondary side at once, but flow through C earlier
S1And C
S2, up to secondary side electric current is arranged, so just realized that the no-voltage (ZVS) of S2 is turn-offed.And when S1 turn-offed, input current did not flow through diode D1 at once yet, but gave C earlier
S1Discharge up to the D1 conducting, has just realized that so also the no-voltage of S1 is turn-offed.In addition, switching tube S3 and S4 work in power frequency, and the process that turns on and off of these two switches also back exciting converter with traditional is the same, works in soft on off state.
In sum, the power decoupled that the present invention improves is by circuit structure realization itself, exactly because the Sepic circuit is transferred to power pulsations on the voltage on the capacitor C 2, just makes the capacity of capacitor C 1 and C2 to reduce; And soft switching characteristic of the present invention is because introduced second capacitor C in circuit
S1With the 3rd capacitor C
S2Thereby, guarantee that two HF switch also can realize soft switch when turn-offing.The peak current controlling schemes that the present invention proposes then is to be applied in the circuit of the present invention in order to provide the output current of high-quality to electrical network, and suitable controlling schemes has been arranged, and also can realize improving better power decoupled and soft switching characteristic.
Inverter of the present invention has the following advantages: (1) its circuit structure is simple, has only used four device for power switching; (2) it can realize the soft switch operation of all switches, thereby reduces switching loss, improves system effectiveness; (3) it can reduce the volume and the capacity of decoupling capacitance significantly, thereby improve power decoupled by power pulsations being converted into the mains ripple on the capacitor C 2; (4) switch S 1 works in fixing duty ratio, and switch S 2 adopts the peak current controlling schemes, and switch S 3 and S4 are easy to control and realization with power frequency operation; (5) it can realize the electrical isolation of input and output by anti-violent change depressor; (6) it can provide the output current of unit power and low harmonic wave to electrical network; (7) as required, by suitable control, can realize that harmonic wave suppresses and no-power compensation function.
Description of drawings
Fig. 1 is traditional back exciting converter.
Fig. 2 is the inverse-excitation type combining inverter in a kind of AC of being applicable to module in the prior art.
Fig. 3 is a kind of soft switching inverter topological structure based on the high frequency anti exciting converter in the prior art.
Fig. 4 is the structural representation of PV soft switch back exciting converter of the present invention.
Fig. 5 to Figure 10 is followed successively by the simple structure schematic diagram of six kinds of effective mode of operations of inverter of the present invention, among the figure, and i
1Be input current, i
L1For flowing through the electric current of second inductance L 1, i
C2For flowing through the electric current of first capacitor C 2, v
C2Be the voltage on first capacitor C 2, i
L2Be the electric current of the former limit winding L 2 that flows through anti-violent change depressor T, i
L3Be the electric current of secondary first winding L 3 that flows through anti-violent change depressor T, i
L4Be the electric current of secondary second winding L 4 that flows through anti-violent change depressor T, i
2Be the secondary winding current of anti-violent change depressor T, i
oBe output current.
Figure 11 is Continuity signal waveform, voltage waveform and the current waveform schematic diagram thereof on the 4th controlled tr tube S1 and the 3rd controlled tr tube S2, among the figure, and v
S1Represent the voltage on the 4th controlled tr tube S1, i
S1Represent the electric current on the 4th controlled tr tube S1, v
S2Represent the voltage on the 3rd controlled tr tube S2, v
Cs1Represent second capacitor C
S1The voltage at two ends, v
Cs2Represent the 3rd capacitor C
S2The voltage at two ends, i
S2Represent the electric current on the 3rd controlled tr tube S2.
Figure 12 is the work wave of inverter of the present invention.
Embodiment
Referring to shown in Figure 4, the soft switch back exciting converter of this embodiment is by switching tube drive circuit 1, solar panel photovoltaic array PV, anti-violent change depressor T, the first controlled tr tube S3, the second controlled tr tube S4, the 3rd controlled tr tube S2, the first diode D3, the second diode D4, output capacitance C3, first inductance L
f, input capacitance C1, second inductance L 1, first capacitor C 2, second capacitor C
S1, the 3rd capacitor C
S2, the 4th controlled tr tube S1, the 3rd diode D1 and the 4th diode D2 form, solar panel photovoltaic array PV is positioned at the same side of the former limit winding L 2 of anti-violent change depressor T, the non-same polarity of secondary first winding L 3 of anti-violent change depressor T connects the collector electrode of the first controlled tr tube S3, the emitter of the first controlled tr tube S3 connects the positive terminal of the first diode D3, and the negative pole end of the first diode D3 connects first inductance L
fAn end, the end of output capacitance C3 and the positive terminal of the second diode D4, the negative pole end of the second diode D4 connects the collector electrode of the second controlled tr tube S4, the emitter of the second controlled tr tube S4 connects the end of the same name of secondary second winding L 4 of anti-violent change depressor T, and the non-same polarity of secondary second winding L 4 of anti-violent change depressor T connects the end of the same name of secondary first winding L 3 of anti-violent change depressor T and the other end of output capacitance C3; The direct voltage v of solar panel photovoltaic array PV input
sBe applied to the two ends of input capacitance C1, the end of input capacitance C1 connects an end of second inductance L 1, the other end of second inductance L 1 connects the collector electrode of the 4th controlled tr tube S1 and an end of first capacitor C 2, and the other end of first capacitor C 2 connects positive terminal, the emitter of the 3rd controlled tr tube S2, second capacitor C of the 3rd diode D1
S1An end and the 3rd capacitor C
S2An end, the collector electrode of the 3rd controlled tr tube S2 connects negative pole end and the 3rd capacitor C of the 4th diode D2
S2The other end, the positive terminal of the 4th diode D2 connects the non-same polarity and second capacitor C of the former limit winding L 2 of anti-violent change depressor T
S1The other end, the end of the same name of the former limit winding L 2 of anti-violent change depressor T connects the negative pole end of the 3rd diode D1, the emitter of the 4th controlled tr tube S1 and the other end of input capacitance C1, the output of four drive signals of switching tube drive circuit 1 connects the grid of the described first controlled tr tube S3, the second controlled tr tube S4, the 3rd controlled tr tube S2, the 4th controlled tr tube S1 respectively, the other end output AC voltage v of the output capacitance C3 and the first inductance L f
oBe connected to the grid.The 4th controlled tr tube S1 and the 3rd controlled tr tube S2 are high-frequency I GBT switching tube, and switching frequency is in 10K to 100KHZ scope; The first controlled tr tube S3 and the second controlled tr tube S4 are power frequency IGBT switching tube.The described input capacitance C1 and first capacitor C 2 are polarity free capacitor.The no-load voltage ratio of anti-violent change depressor T is 1: n: n (n＞1).
The drive signal waveform of four switches (S1, S2, S3, S4) as shown in figure 12, the first controlled tr tube S3 and the second controlled tr tube S4 complementation are operated in the power frequency positive and negative half period; The shutoff of the 3rd controlled tr tube S2 adopts the peak current control method to control according to the current sinusoidal wave envelope of the former limit winding L 2 that flows through anti-violent change depressor T; The 4th controlled tr tube S1 is with fixed duty cycle high frequency operation, and the duty ratio of the 4th controlled tr tube S1 Continuity signal is always greater than the duty ratio of the 3rd controlled tr tube S2 Continuity signal, and the 4th controlled tr tube S1 and the 3rd controlled tr tube S2 are open-minded simultaneously.
Claims (6)
1, a kind of soft switch back exciting converter that is used for the solar photovoltaic grid-connection generating, described soft switch back exciting converter comprises switching tube drive circuit (1), solar panel photovoltaic array (PV), anti-violent change depressor (T), first controlled tr tube (S3), second controlled tr tube (S4), the 3rd controlled tr tube (S2), first diode (D3), second diode (D4), output capacitance (C3) and the first inductance (L
f), solar panel photovoltaic array (PV) is positioned at the same side of the former limit winding (L2) of anti-violent change depressor (T), the non-same polarity of secondary first winding (L3) of anti-violent change depressor (T) connects the collector electrode of first controlled tr tube (S3), the emitter of first controlled tr tube (S3) connects the positive terminal of first diode (D3), and the negative pole end of first diode (D3) connects the first inductance (L
f) an end, an end of output capacitance (C3) and the positive terminal of second diode (D4), the negative pole end of second diode (D4) connects the collector electrode of second controlled tr tube (S4), the emitter of second controlled tr tube (S4) connects the end of the same name of secondary second winding (L4) of anti-violent change depressor (T), and the non-same polarity of secondary second winding (L4) of anti-violent change depressor (T) connects the end of the same name of secondary first winding (L3) of anti-violent change depressor (T) and the other end of output capacitance (C3); It is characterized in that described soft switch back exciting converter also comprises input capacitance (C1), second inductance (L1), first electric capacity (C2), the second electric capacity (C
S1), the 3rd electric capacity (C
S2), the 4th controlled tr tube (S1), the 3rd diode (D1) and the 4th diode (D2), the direct voltage (v of solar panel photovoltaic array (PV) input
s) be applied to the two ends of input capacitance (C1), one end of input capacitance (C1) connects an end of second inductance (L1), the other end of second inductance (L1) connects the collector electrode of the 4th controlled tr tube (S1) and an end of first electric capacity (C2), and the other end of first electric capacity (C2) connects emitter, the second electric capacity (C of the positive terminal of the 3rd diode (D1), the 3rd controlled tr tube (S2)
S1) an end and the 3rd electric capacity (C
S2) an end, the collector electrode of the 3rd controlled tr tube (S2) connects the negative pole end and the 3rd electric capacity (C of the 4th diode (D2)
S2) the other end, the positive terminal of the 4th diode (D2) connects the non-same polarity and the second electric capacity (C of the former limit winding (L2) of anti-violent change depressor (T)
S1) the other end, the end of the same name of the former limit winding (L2) of anti-violent change depressor (T) connects the negative pole end of the 3rd diode (D1), the emitter of the 4th controlled tr tube (S1) and the other end of input capacitance (C1), the output of four drive signals of switching tube drive circuit (1) connects the grid of described first controlled tr tube (S3), second controlled tr tube (S4), the 3rd controlled tr tube (S2), the 4th controlled tr tube (S1) respectively, the output capacitance (C3) and the first inductance (L
f) other end output AC voltage (v
o) be connected to the grid.
2, a kind of soft switch back exciting converter that is used for the solar photovoltaic grid-connection generating according to claim 1 is characterized in that the 4th controlled tr tube (S1) and the 3rd controlled tr tube (S2) are the HF switch pipe, and switching frequency is in 10K to 100KHZ scope.
3, a kind of soft switch back exciting converter that is used for the solar photovoltaic grid-connection generating according to claim 1 is characterized in that first controlled tr tube (S3) and second controlled tr tube (S4) are the power frequency switching tube.
4, a kind of soft switch back exciting converter that is used for the solar photovoltaic grid-connection generating according to claim 1 is characterized in that described input capacitance (C1) and first electric capacity (C2) are polarity free capacitor.
5, according to claim 1,2,3 or 4 described a kind of soft switch back exciting converters that are used for the solar photovoltaic grid-connection generating, it is characterized in that first controlled tr tube (S3) and second controlled tr tube (S4) complementation are operated in the power frequency positive and negative half period; The shutoff of the 3rd controlled tr tube (S2) adopts the peak current control method to control according to the current sinusoidal wave envelope of the former limit winding (L2) that flows through anti-violent change depressor (T); The 4th controlled tr tube (S1) moves with the fixed duty cycle high frequency, the duty ratio of the 4th controlled tr tube (S1) Continuity signal is always greater than the duty ratio of the 3rd controlled tr tube (S2) Continuity signal, and the 4th controlled tr tube (S1) is open-minded simultaneously with the 3rd controlled tr tube (S2).
6, a kind of soft switch back exciting converter that is used for the solar photovoltaic grid-connection generating according to claim 5 is characterized in that described first controlled tr tube (S3), second controlled tr tube (S4), the 3rd controlled tr tube (S2), the 4th controlled tr tube (S1) adopt the IGBT switching tube.
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| US11881814B2 (en) | 2005-12-05 | 2024-01-23 | Solaredge Technologies Ltd. | Testing of a photovoltaic panel |
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