CN103107729A - Single-phase isolation grid-connected inverter and control method thereof - Google Patents
Single-phase isolation grid-connected inverter and control method thereof Download PDFInfo
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Abstract
The invention discloses a single-phase isolation grid-connected inverter which comprises a conversion isolation circuit, a switch rectification circuit and an H-bridge reversing circuit. The conversion isolation circuit is used for converting a direct current power source PV into alternative current, the switch rectification circuit is used for boosting and rectifying, and the H-bridge reversing circuit is used for converting half-wave rectification into sine waves meeting requirements of grid-connection. The conversion isolation circuit is connected with the switch rectification circuit which is connected with the H-bridge reversing circuit. The conversion isolation circuit and the switch rectification circuit together form a combined circuit. According to the single-phase isolation grid-connected inverter, a push-pull circuit, a full-bridge circuit and the H-bridge conversion circuit are adopted, and simultaneously the resonance oscillation soft-switching technology is added. Not only is critical conduction of secondary-side current realized, but also no-voltage conduction of a primary-side switch pipe is realized, so that efficiency is high. Meanwhile, due to addition of the resonance oscillation, current of the primary side and the secondary side in each switching period approaches to half sin waves, and the resonance oscillation is reduced to generate. Systematic electromagnetic compatibility (EMC) is optimized, and the sizes of output filter conductance and an output filter are greatly reduced.
Description
Technical field
The present invention relates to field of photovoltaic power generation, relate in particular to single-phase isolated grid-connected inverter and control method thereof.
Background technology
single-phase photovoltaic DC-to-AC converter generally adopts one-level or the non-isolated topology of two-stage transless to realize, efficient can be accomplished very high, can bring the problem of leakage current, although some topology can solve leakage problem, but can not fundamentally solve, adopt isolated topology, can cut off drain current path fully from the space, thoroughly solve leakage problem, but efficient is generally not high, main cause is that isolated topology is generally used two-stage topology, one-level DC/DC transformer buck, one-level DC/AC inversion, in order to reduce volume, buck has partly adopted high-frequency isolation, at the high frequency state, it is large that former secondary-side switch pipe and transformer loss all can become, efficient is low, therefore propose in the industry to realize that with the one-level high-frequency isolation DC/AC obtains 100Hz/120Hz steamed bun half-wave, then be converted to the 50Hz/60Hz sine wave with the H bridge, efficient will improve a lot like this.U.S. Enphase house journal product adopts the staggered DC/AC that realizes of two-way flyback at present, the conversion of H bridge realizes sinusoidal wave, controls and adopts critical conduction mode to realize the secondary zero current passing, eliminates the secondary power tube and oppositely recovers, its peak efficiency can reach more than 96%, very near non-isolated topology.But its product is at former limit switch or hard switching, and efficient is wanted further to promote very difficult, and it suppresses the same with other general topologies to the inversion output DC component, and system EMC can (EMC) not improve.Before the present invention, control method by DC converting exchanges commonly use in the industry SPWM or SVPWM, but these two kinds of control methods is difficult to realize soft switch, this has brought certain limitation to further improving of inverter efficiency, makes it depend on the optimization of device and topology fully.
Summary of the invention
The object of the invention is to propose a kind of efficient higher, the isolated inverter that system EMC energy (EMC) is more optimized.
For reaching this purpose, the present invention by the following technical solutions:
a kind of single-phase isolated grid-connected inverter, it is characterized in that: described inverter comprises for the conversion buffer circuit (1) that DC power supply PV is converted to alternating current, the switch rectifying circuit (2) that is used for resonance and rectification, be used for halfwave rectifier is converted to the H bridge commutating circuit (3) of the sine wave that meeting is incorporated into the power networks requires, the output of conversion buffer circuit (1) is connected 2 with switch rectifying circuit) input connect, the output of switch rectifying circuit (2) is connected 3 with H bridge commutating circuit) input connect, conversion buffer circuit (1) and switch rectifying circuit (2) form combinational circuit (4) jointly.
Wherein, conversion buffer circuit (1) is push-pull circuit, push-pull circuit comprises switching tube K15, switching tube K16 and high frequency transformer T14, the former limit turnover line end of T14 is received respectively the end of K15, K16, the center tap terminal of T14 is the first input end of conversion buffer circuit (1), the other end of K15, K16 links together as the second input of conversion buffer circuit (1), and the secondary line of T14 is as the first output and second output of conversion buffer circuit (1).
wherein, conversion buffer circuit (1) is full-bridge circuit, full-bridge circuit comprises switching tube K17, switching tube K18, switching tube K19, switching tube K20 and high frequency transformer T21, the end of K17 and the end of K19 link together as the first input end of conversion buffer circuit (1), the end of K18 and the end of K20 link together as the second input of conversion buffer circuit (1), one end of the former limit line of the other end of K17 and the other end of K18 and T21 links together, the other end of the former limit line of the other end of K19 and the other end of K20 and T21 links together, the secondary line of T21 is as the first output and second output of conversion buffer circuit (1).
wherein, switch rectifying circuit (2) is the resonance voltage doubling rectifing circuit, the resonance voltage doubling rectifing circuit comprises inductance L 13, capacitor C 9, capacitor C 10, switching tube K11 and switching tube K12, the end of L13 is as the first input end of switch rectifying circuit (2), the end of C9 and the end of C10 link together as the second input of switch rectifying circuit (2), the end of the other end of L13 and K11 and the end of K12 link together, the other end of K11 and the other end of C9 link together as the first output of switch rectifying circuit (2), the other end of K12 and the other end of C10 link together as the second output of switch rectifying circuit (2).
wherein, switch rectifying circuit (2) is the resonance full bridge rectifier, the resonance full bridge rectifier comprises inductance L 27, capacitor C 26, switching tube K22, switching tube K23, switching tube K24 and switching tube K25, the end of L27 is as the first input end of switch rectifying circuit (2), the end of K24 and the end of K25 link together as the second input of switch rectifying circuit (2), the other end of L27 is connected with the end of C26, the end of the other end of C26 and K22 and the end of K23 link together, the other end of K22 and the other end of K24 link together as the first output of switch rectifying circuit (2), the other end of K23 and the other end of K25 link together as the second output of switch rectifying circuit (2).
Wherein, H bridge commutating circuit (3) comprises switching tube K5, switching tube K6, switching tube K7 and switching tube K8, the end of K5 and the end of K8 link together as the first input end of H bridge commutating circuit (3), the end of K6 and the end of K7 link together as the second input of H bridge commutating circuit (3), the other end of K5 and the other end of K6 link together as the first output of H bridge commutating circuit (3), and the other end of K7 and the other end of K8 link together as the second output of H bridge commutating circuit (3).
Wherein, N road combinational circuit (4) is connected in parallel, and then connects with H bridge commutating circuit (3), and N is more than or equal to 2.
Wherein, combinational circuit (4) N road crisscross parallel differs a stagger angle between every road, and stagger angle is Pi/N.
Wherein, also comprise voltage stabilizing circuit, the input of voltage stabilizing circuit is connected to the two ends of DC power supply PV, and the output of voltage stabilizing circuit is connected to the input of conversion buffer circuit (1).
Wherein, voltage stabilizing circuit is N road voltage stabilizing circuit crisscross parallel, differs a stagger angle between every road, and stagger angle is 2Pi/N.
A kind of control method of inverter comprises:
In exchanging negative half-cycle:
Control conversion buffer circuit (1): open switching tube K16, on-off switching tube K15, control switch rectification circuit (2): open switching tube K11, on-off switching tube K12, control H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit (1): on-off switching tube K16, on-off switching tube K15, control switch rectification circuit (2): open switching tube K11, on-off switching tube K12, control H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit (1): open switching tube K15, on-off switching tube K16, control switch rectification circuit (2): open switching tube K12, on-off switching tube K11, control H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit (1): open switching tube K15, on-off switching tube K16, control switch rectification circuit (2): open switching tube K12, on-off switching tube K11 controls H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5.
Wherein, the frequency of switching tube changes, and the variation of the driving frequency by the by-pass cock pipe comes regulation voltage electric current and amplitude.
Wherein, after frequency reaches the upper limit, also to continue upwards regulating frequency, adopt the brust mode to realize regulatory function.
Wherein, after frequency reaches the upper limit, also will continue upwards regulating frequency, proportion is constant, and duty ratio diminishes to realize regulatory function.
Wherein, the duty ratio in each cycle is fixed.
Wherein, the dead band in each cycle is fixed.
Wherein, the voltage current waveform of switch rectifying circuit (2) is the steamed bun half-wave of power frequency.
Wherein, the voltage current waveform of H bridge commutating circuit (3) is the sine wave of power frequency.
Beneficial effect of the present invention is: a kind of single-phase isolated grid-connected inverter, comprise for the conversion buffer circuit that DC power supply PV is converted to alternating current, be used for boosting and the switch rectifying circuit of rectification, be used for halfwave rectifier is converted to the H bridge commutating circuit of the sine wave that meeting is incorporated into the power networks requires, the conversion buffer circuit is connected with switch rectifying circuit, switch rectifying circuit is connected with H bridge commutating circuit, and conversion buffer circuit and switch rectifying circuit form combinational circuit jointly.the present invention has adopted push-pull circuit, full-bridge circuit+H bridge commutating circuit, added simultaneously the resonant type soft-switch technology, not only realize the critical conduction of secondary current, but also realized former limit switch tube zero voltage turn-on, thereby make efficient higher, simultaneously owing to having added resonance, make the electric current of the interior former limit of each switch periods and secondary near half-sinusoid, reducing harmonic wave produces, optimized system EMC energy (EMC), the volume of output inductor and output filter is had more greatly to be reduced, high frequency transformer in invention has played the effect of electrical isolation, fundamentally solved leakage problem.Control method of the present invention is incorporated into PFM in the control of inverter, in conjunction with harmonic technology, has realized that former limit switch tube zero voltage is open-minded, secondary rectifying tube zero-current switching.
Description of drawings
Fig. 1 is the power circuit figure that schematic diagram of the present invention and embodiment propose.
Fig. 2 is the embodiments of the invention circuit diagrams.
Fig. 3 is embodiments of the invention negative half period operating state 1.
Fig. 4 is embodiments of the invention negative half period operating state 2.
Fig. 5 is embodiments of the invention negative half period operating state 3.
Fig. 6 is embodiments of the invention negative half period operating state 4.
Fig. 7 is the switching tube oscillogram at crucial moment of embodiments of the invention.
Fig. 8 is full-bridge circuit of the present invention.
Fig. 9 is resonance full bridge rectifier of the present invention.
Figure 10 is combinational circuit crisscross parallel inverter circuit schematic diagram.
Figure 11 is the inverter circuit schematic diagram with pressurizer.
Figure 12 is pressurizer crisscross parallel inverter circuit schematic diagram.
Embodiment
Further illustrate technical scheme of the present invention below in conjunction with Fig. 1-Figure 12 and by embodiment.
As shown in Figure 1, a kind of single-phase isolated grid-connected inverter, comprise for the conversion buffer circuit 1 that DC power supply PV is converted to alternating current, for the switch rectifying circuit 2 of resonance and rectification, for the H bridge commutating circuit 3 that halfwave rectifier is converted to the sine wave that meeting is incorporated into the power networks requires, the input that the output of conversion buffer circuit 1 is connected with switch rectifying circuit connects, the input that the output of switch rectifying circuit 2 is connected with H bridge commutating circuit connects, the common combinational circuit 4 that forms of conversion buffer circuit 1 and switch rectifying circuit 2.
In the present embodiment, conversion buffer circuit 1 is push-pull circuit, push-pull circuit comprises switching tube K15, switching tube K16 and high frequency transformer T14, the former limit turnover line end of T14 is received respectively the end of K15, K16, the center tap terminal of T14 is the first input end of conversion buffer circuit 1, the other end of K15, K16 links together as the second input of conversion buffer circuit 1, and the secondary line of T14 is as the first output and second output of conversion buffer circuit 1.
as another kind of embodiment, conversion buffer circuit 1 is full-bridge circuit, as shown in Figure 8, full-bridge circuit comprises switching tube K17, switching tube K18, switching tube K19, switching tube K20 and high frequency transformer T21, the end of K17 and the end of K19 link together as the first input end of conversion buffer circuit 1, the end of K18 and the end of K20 link together as the second input of conversion buffer circuit 1, one end of the former limit line of the other end of K17 and the other end of K18 and T21 links together, the other end of the former limit line of the other end of K19 and the other end of K20 and T21 links together, the secondary line of T21 is as the first output and second output of conversion buffer circuit 1.
in the present embodiment, switch rectifying circuit 2 is the resonance voltage doubling rectifing circuit, the resonance voltage doubling rectifing circuit comprises inductance L 13, capacitor C 9, capacitor C 10, switching tube K11 and switching tube K12, the end of L13 is as the first input end of switch rectifying circuit 2, the end of C9 and the end of C10 link together as the second input of switch rectifying circuit 2, the end of the other end of L13 and K11 and the end of K12 link together, the other end of K11 and the other end of C9 link together as the first output of switch rectifying circuit 2, the other end of K12 and the other end of C10 link together as the second output of switch rectifying circuit 2.
as another kind of embodiment, switch rectifying circuit 2 is the resonance full bridge rectifier, as shown in Figure 9, the resonance full bridge rectifier comprises inductance L 27, capacitor C 26, switching tube K22, switching tube K23, switching tube K24 and switching tube K25, the end of L27 is as the first input end of switch rectifying circuit 2, the end of K24 and the end of K25 link together as the second input of switch rectifying circuit 2, the other end of L27 is connected with the end of C26, the end of the other end of C26 and K22 and the end of K23 link together, the other end of K22 and the other end of K24 link together as the first output of switch rectifying circuit 2, the other end of K23 and the other end of K25 link together as the second output of switch rectifying circuit 2.
In the present embodiment, H bridge commutating circuit 3 comprises switching tube K5, switching tube K6, switching tube K7 and switching tube K8, the end of K5 and the end of K8 link together as the first input end of H bridge commutating circuit 3, the end of K6 and the end of K7 link together as the second input of H bridge commutating circuit 3, the other end of K5 and the other end of K6 link together as the first output of H bridge commutating circuit 3, and the other end of K7 and the other end of K8 link together as the second output of H bridge commutating circuit 3.
In the present embodiment, K5, K6, K7, K8, K15, K16 are MOSFET, and K11, K12 are diode, and L13 is independent inductance, and C9, C10 are polarity free capacitor, and T14 is high frequency transformer.
In the present embodiment, N road combinational circuit 4 is connected in parallel, and then connects with H bridge commutating circuit 3, and N is more than or equal to 2.
Further, combinational circuit 4 as shown in figure 10, differs a stagger angle by N road crisscross parallel between every road, and stagger angle is Pi/N.
In the present embodiment, inverter also comprises voltage stabilizing circuit, and as shown in figure 11, the input of voltage stabilizing circuit is connected to the two ends of DC power supply PV, and the output of voltage stabilizing circuit is connected to the input of conversion buffer circuit 1.Voltage stabilizing circuit can be Buck conversion circuit (buck circuit), boost type translation circuit (boost circuit), step-down/up type translation circuit (buck-boost circuit).
Further, voltage stabilizing circuit is N road voltage stabilizing circuit crisscross parallel, as shown in figure 12, differs a stagger angle between every road, and stagger angle is 2Pi/N.
in the present embodiment, adopted to recommend and added H bridge commutating circuit, add simultaneously the resonant type soft-switch technology, see Fig. 2, not only realize the critical conduction of secondary current, but also realized former limit switch tube zero voltage turn-on, thereby make efficient higher, simultaneously owing to having added resonance, make the electric current of the interior former limit of each switch periods and secondary near half-sinusoid, reducing harmonic wave produces, optimized the system EMC energy, the volume of output inductor and output filter is had more greatly to be reduced, high frequency transformer in embodiment has played the effect of electrical isolation, fundamentally solved leakage problem.
Further, the detailed operation principle of the present embodiment is analyzed, exchanging negative half period, formed by one of four states: t0, t1, t2, t3.
The t0 state, as shown in Figure 3, K16 is open-minded, and K15 turn-offs, and the electric current on inverter former limit is flowed to the centre cap of T14 by DC power supply PV positive pole, and through bottom, the former limit of T14 winding, DC power supply PV negative pole is arrived in the K16 that flows through drain electrode at last; The electric current of inverter secondary is flowed out by the Same Name of Ends of T14 secondary, and through L13, K11, part process C9 gets back to the secondary different name end of T14, and a part is through K8, and through alternating current source, through K6, then process C10 gets back to the secondary winding different name end of T14.
the t1 state, as shown in Figure 4, K16 turn-offs, K15 turn-offs, because former limit winding is also inductance, store energy, close at K16 and have no progeny, there is no current circuit, energy demand looks for path to discharge, existence due to T14, the energy of the former limit of T14 the latter half winding will be transferred to the first half, flow to DC power supply PV by centre cap anodal, flow out from DC power supply PV negative pole again, backward diode by K15, get back to the Same Name of Ends of T14 former limit top sub-winding, at this moment be equivalent to 15 drain-source voltage is reduced to and only have a diode drop, before becoming 0, opens in electric current K15, the no-voltage that realizes K15 is open-minded, due to effect and the not change of polarity of voltage of transformer, the electric current of inverter secondary will keep the loop of tO secondary current.
The t2 state, as shown in Figure 5, K16 turn-offs, and K15 is open-minded, and the electric current on inverter former limit is flowed to the centre cap of T14 by DC power supply PV positive pole, and through top, the former limit of T14 winding, DC power supply PV negative pole is arrived in the K15 that flows through drain electrode at last; The electric current of inverter secondary is flowed out by the different name end of T14 secondary, and a part is got back to the secondary Same Name of Ends of T14 through C10, K12, L13, a part is through K9, through K8, through alternating current source, through K6, get back to again the secondary Motor Winding Same Name of Ends of T14 through K12, L13.
The t3 state, as shown in Figure 6, K16 turn-offs, and K15 turn-offs, and electric current is flowed out by T14 former limit centre cap, through DC power supply PV, gets back to T14 bottom winding different name end through K16; The electric current of inverter secondary will keep the loop of t2 secondary current.
Further, Fig. 7 oscillogram of having showed crucial moment.
Further, when Design of Transformer, switching frequency is too high will bring a lot of problems, all restricted to highest frequency in reality.When steamed bun half-wave zero passage, highest frequency can not satisfy the requirement of gain, and this will take special measure to go to process.In conjunction with the brust pattern, make the zero passage place satisfy the demand of voltage or electric current in the present embodiment.
In the present embodiment, a kind of control method of inverter comprises:
In exchanging negative half-cycle:
Control conversion buffer circuit 1: open switching tube K16, on-off switching tube K15, control switch rectification circuit 2: open switching tube K11, on-off switching tube K12, control H bridge commutating circuit 3: open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit 1: on-off switching tube K16, on-off switching tube K15, control switch rectification circuit 2: open switching tube K11, on-off switching tube K12, control H bridge commutating circuit 3: open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit 1: open switching tube K15, on-off switching tube K16, control switch rectification circuit 2: open switching tube K12, on-off switching tube K11, control H bridge commutating circuit 3: open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit 1: open switching tube K15, on-off switching tube K16, control switch rectification circuit 2: open switching tube K12, on-off switching tube K11 controls H bridge commutating circuit 3: open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5.
In the present embodiment, the frequency of switching tube changes, and the variation of the driving frequency by the by-pass cock pipe comes regulation voltage electric current and amplitude.
After frequency reaches the upper limit, also to continue upwards regulating frequency, adopt the brust mode namely to send out a ripple, closes several ripples and realize regulatory function, with the difference of demand, send out several ripple different with the several ripples in pass.
As another kind of embodiment, after frequency reaches the upper limit, also to continue upwards regulating frequency, proportion is constant, and duty ratio diminishes to realize regulatory function.
In the present embodiment, the duty ratio in each cycle is fixed.
In the present embodiment, the dead band in each cycle is fixed.
In the present embodiment, the voltage current waveform of switch rectifying circuit 2 is the steamed bun half-wave of power frequency.
In the present embodiment, the voltage current waveform of H bridge commutating circuit 3 is the sine wave of power frequency.
In the present embodiment, pulse frequency modulated PFM is incorporated in the control of inverter, open-minded to realize former limit switch tube zero voltage in conjunction with harmonic technology, secondary rectifying tube zero-current switching.
Gain curve and frequency characteristic in conjunction with topology make frequency and output voltage or output current set up a dull one-to-one relationship, when output voltage maybe needs to change, with regard to regulating frequency, change its gain curve, thereby change output voltage or electric current.In embodiments of the invention, when at steamed bun half-wave top, require output voltage or electric current maximum, the voltage of requirement or current gain are also maximum, and the switch frequency will reduce; When in steamed bun half-wave zero passage, the gain of requirement is zero, and switching frequency will be the highest.
The above is only the specific embodiment of the present invention, and these are described just in order to explain principle of the present invention, and can not be interpreted as by any way limiting the scope of the invention.Based on explanation herein, those skilled in the art does not need to pay performing creative labour can associate other embodiment of the present invention, within these modes all will fall into protection scope of the present invention.
Claims (18)
1. single-phase isolated grid-connected inverter, it is characterized in that: described inverter comprises for the conversion buffer circuit (1) that DC power supply PV is converted to alternating current, the switch rectifying circuit (2) that is used for resonance and rectification, be used for halfwave rectifier is converted to the H bridge commutating circuit (3) of the sine wave that meeting is incorporated into the power networks requires, the output of conversion buffer circuit (1) is connected 2 with switch rectifying circuit) input connect, the output of switch rectifying circuit (2) is connected 3 with H bridge commutating circuit) input connect, conversion buffer circuit (1) and switch rectifying circuit (2) form combinational circuit (4) jointly.
2. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: described conversion buffer circuit (1) is push-pull circuit, described push-pull circuit comprises switching tube K15, switching tube K16 and high frequency transformer T14, the former limit turnover line end of T14 is received respectively K15, the end of K16, the center tap terminal of T14 is the first input end of conversion buffer circuit (1), K15, the other end of K16 links together as the second input of conversion buffer circuit (1), the secondary line of T14 is as the first output and second output of conversion buffer circuit (1).
3. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: described conversion buffer circuit (1) is full-bridge circuit, described full-bridge circuit comprises switching tube K17, switching tube K18, switching tube K19, switching tube K20 and high frequency transformer T21, the end of K17 and the end of K19 link together as the first input end of conversion buffer circuit (1), the end of K18 and the end of K20 link together as the second input of conversion buffer circuit (1), one end of the former limit line of the other end of K17 and the other end of K18 and T21 links together, the other end of the former limit line of the other end of K19 and the other end of K20 and T21 links together, the secondary line of T21 is as the first output and second output of conversion buffer circuit (1).
4. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: described switch rectifying circuit (2) is the resonance voltage doubling rectifing circuit, the resonance voltage doubling rectifing circuit comprises inductance L 13, capacitor C 9, capacitor C 10, switching tube K11 and switching tube K12, the end of L13 is as the first input end of switch rectifying circuit (2), the end of C9 and the end of C10 link together as the second input of switch rectifying circuit (2), the end of the other end of L13 and K11 and the end of K12 link together, the other end of K11 and the other end of C9 link together as the first output of switch rectifying circuit (2), the other end of K12 and the other end of C10 link together as the second output of switch rectifying circuit (2).
5. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: described switch rectifying circuit (2) is the resonance full bridge rectifier, the resonance full bridge rectifier comprises inductance L 27, capacitor C 26, switching tube K22, switching tube K23, switching tube K24 and switching tube K25, the end of L27 is as the first input end of switch rectifying circuit (2), the end of K24 and the end of K25 link together as the second input of switch rectifying circuit (2), the other end of L27 is connected with the end of C26, the end of the other end of C26 and K22 and the end of K23 link together, the other end of K22 and the other end of K24 link together as the first output of switch rectifying circuit (2), the other end of K23 and the other end of K25 link together as the second output of switch rectifying circuit (2).
6. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: described H bridge commutating circuit (3) comprises switching tube K5, switching tube K6, switching tube K7 and switching tube K8, the end of K5 and the end of K8 link together as the first input end of H bridge commutating circuit (3), the end of K6 and the end of K7 link together as the second input of H bridge commutating circuit (3), the other end of K5 and the other end of K6 link together as the first output of H bridge commutating circuit (3), the other end of K7 and the other end of K8 link together as the second output of H bridge commutating circuit (3).
7. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: the described combinational circuit in N road (4) is connected in parallel, and then connects with H bridge commutating circuit (3), and N is more than or equal to 2.
8. a kind of single-phase isolated grid-connected inverter according to claim 7 is characterized in that: described combinational circuit (4) N road crisscross parallel, differ a stagger angle between every road, and stagger angle is Pi/N.
9. a kind of single-phase isolated grid-connected inverter according to claim 1, it is characterized in that: described inverter also comprises voltage stabilizing circuit, the input of voltage stabilizing circuit is connected to the two ends of DC power supply PV, and the output of voltage stabilizing circuit is connected to the input of conversion buffer circuit (1).
10. a kind of single-phase isolated grid-connected inverter according to claim 9 is characterized in that: described voltage stabilizing circuit is N road voltage stabilizing circuit crisscross parallel, differs a stagger angle between every road, and stagger angle is 2Pi/N.
11. the control method of an inverter is characterized in that: comprising:
In exchanging negative half-cycle:
Control conversion buffer circuit (1): open switching tube K16, on-off switching tube K15, control switch rectification circuit (2): open switching tube K11, on-off switching tube K12, control H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit (1): on-off switching tube K16, on-off switching tube K15, control switch rectification circuit (2): open switching tube K11, on-off switching tube K12, control H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit (1): open switching tube K15, on-off switching tube K16, control switch rectification circuit (2): open switching tube K12, on-off switching tube K11, control H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5;
Control conversion buffer circuit (1): open switching tube K15, on-off switching tube K16, control switch rectification circuit (2): open switching tube K12, on-off switching tube K11 controls H bridge commutating circuit (3): open switching tube K8, on-off switching tube K7, open switching tube K6, on-off switching tube K5.
12. the control method of a kind of inverter according to claim 11 is characterized in that: the frequency of described switching tube changes, and the variation of the driving frequency by the by-pass cock pipe comes regulation voltage electric current and amplitude.
13. the control method of a kind of inverter according to claim 11 is characterized in that: after frequency reaches the upper limit, also will continue upwards regulating frequency, adopt the brust mode to realize regulatory function.
14. the control method of a kind of inverter according to claim 11 is characterized in that: after frequency reaches the upper limit, also will continue upwards regulating frequency, proportion is constant, and duty ratio diminishes to realize regulatory function.
15. the control method of a kind of inverter according to claim 11 is characterized in that: the duty ratio in each cycle is fixed.
16. the control method of a kind of inverter according to claim 11 is characterized in that: the dead band in each cycle is fixed.
17. the control method of a kind of inverter according to claim 11 is characterized in that: the voltage current waveform of switch rectifying circuit (2) is the steamed bun half-wave of power frequency.
18. the control method of a kind of inverter according to claim 11 is characterized in that: the voltage current waveform of H bridge commutating circuit (3) is the sine wave of power frequency.
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917408A (en) * | 2014-12-12 | 2015-09-16 | 武汉绿鼎天舒科技发展有限公司 | Multifunctional desk lamp |
| CN105337505A (en) * | 2015-11-12 | 2016-02-17 | 深圳市泰昂能源科技股份有限公司 | DC/DC conversion circuit and power supply device |
| CN108736757A (en) * | 2018-06-01 | 2018-11-02 | 东南大学 | A kind of current source type no electrolytic capacitor High Frequency Link changer system |
| CN110752756A (en) * | 2019-10-28 | 2020-02-04 | 北方工业大学 | High-gain conversion circuit and control method thereof |
| CN116566233A (en) * | 2023-07-05 | 2023-08-08 | 深圳市高斯宝电气技术有限公司 | A micro inverter circuit |
-
2013
- 2013-01-05 CN CN 201310000807 patent/CN103107729A/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN104917408A (en) * | 2014-12-12 | 2015-09-16 | 武汉绿鼎天舒科技发展有限公司 | Multifunctional desk lamp |
| CN105337505A (en) * | 2015-11-12 | 2016-02-17 | 深圳市泰昂能源科技股份有限公司 | DC/DC conversion circuit and power supply device |
| CN108736757A (en) * | 2018-06-01 | 2018-11-02 | 东南大学 | A kind of current source type no electrolytic capacitor High Frequency Link changer system |
| CN110752756A (en) * | 2019-10-28 | 2020-02-04 | 北方工业大学 | High-gain conversion circuit and control method thereof |
| CN116566233A (en) * | 2023-07-05 | 2023-08-08 | 深圳市高斯宝电气技术有限公司 | A micro inverter circuit |
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Application publication date: 20130515 |