CN102624274A - Interleaving parallel grid-connected inverter and control method thereof - Google Patents
Interleaving parallel grid-connected inverter and control method thereof Download PDFInfo
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- CN102624274A CN102624274A CN2011100326661A CN201110032666A CN102624274A CN 102624274 A CN102624274 A CN 102624274A CN 2011100326661 A CN2011100326661 A CN 2011100326661A CN 201110032666 A CN201110032666 A CN 201110032666A CN 102624274 A CN102624274 A CN 102624274A
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Abstract
The invention discloses an interleaving parallel photovoltaic grid-connected inverter and a control method thereof. The inverter comprises a power supply circuit (10), a first inversion bridge arm (20), a second inversion bridge arm (30), a third inversion bridge arm (40) and a filter circuit (50). The power supply circuit (10) comprises a direct power supply and a filtering capacitor. The inversion bridge arms are formed by two power switch tubes which are connected in series. The switch tube in the first inversion bridge arm is a low frequency switch and the switch tubes in the second and the third inversion bridge arms are high frequency switches. When inverter output power is greater than half load, the switch tubes in the second and the third inversion bridge arms are high frequency interleaving switches. When the output power is less than the half load, the second and the third inversion bridge arms have only one inversion bridge arm high frequency switch and the switch tube in another bridge arm does not work. By using the inverter of the invention, conversion efficiency during light load can be effectively improved; switch tube current stress can be reduced; reliability of the inverter can be improved and grid-connected current harmonic wave contents can be reduced.
Description
Technical field
The invention belongs to the converters technical field, the power inverter technical field in the particularly generation of electricity by new energy technical field, what be specifically related to is a kind of crisscross parallel combining inverter and control method thereof.
Background technology
Along with energy crisis and problem of environmental pollution are serious day by day, solar photovoltaic technology becomes that countries in the world are paid close attention to and the focus of research.
Parallel network power generation is that solar power generation is used topmost mode, and according to statistics, the whole world is the application of being incorporated into the power networks above 90% photovoltaic generation installed capacity, and this is because the relatively independent photovoltaic system of application that is incorporated into the power networks has advantages such as cost is low and non-maintaining.
Photovoltaic combining inverter is the bridge that solar energy power generating equipment is connected with electrical network, is one of equipment of most critical in the grid-connected photovoltaic system.In whole solar energy grid-connected photovoltaic system, the shared system synthesis of the cost of photovoltaic cell ratio originally is the highest, and its price is more expensive; On the other hand, the photoelectric conversion efficiency of photovoltaic cell is lower, in order to reduce the cost of photovoltaic parallel in system unit's energy output; Improve the efficient of whole grid-connected system simultaneously; Require combining inverter to have higher efficient, and traditional combining inverter only can guarantee that when design fully loaded or most effective near full load, the efficient when underloading is very low; And photovoltaic cell generally only is operated in full load condition in the less time period, and this has just caused the reduction of whole system generating efficiency; Extensive installation and application along with grid-connected photovoltaic system; The user has higher requirement to the reliability of combining inverter, the waveform quality of grid-connected current, and design and realization high efficiency, high reliability, low harmonic wave combining inverter are the targets that the parallel network power generation technical field is constantly pursued.
Summary of the invention
The present invention is directed to the deficiency of above-mentioned prior art, a kind of have whole efficiency height, photovoltaic combining inverter that reliability is high are provided.
In order to achieve the above object, the present invention adopts following technical scheme:
A kind of crisscross parallel combining inverter, said crisscross parallel combining inverter comprise power circuit (10), first inverter bridge leg (20), second inverter bridge leg (30), the 3rd inverter bridge leg (40) and filter circuit (50), wherein power circuit (10) by input source (
U In ) and filter capacitor (
C In ) constitute, first inverter bridge leg (20) by first, second switching tube (
S 1,
S 2) constitute, second inverter bridge leg (30) by the 3rd, the 4th switching tube (
S 3,
S 4) constitute, the 3rd inverter bridge leg (40) by the 5th, the 6th switching tube (
S 5,
S 6) constitute, filter circuit (50) by first, second inductance (
L 1,
L 2) constitute;
Wherein: input source (
U In ) positive pole be connected in respectively filter capacitor (
C In ) an end, first switching tube (
S 1) drain electrode, the 3rd switching tube (
S 3) drain electrode and the 5th switching tube (
S 5) drain electrode, input source (
U In ) negative pole be connected in respectively filter capacitor (
C In ) the other end, second switch pipe (
S 2) source electrode, the 4th switching tube (
S 4) source electrode and the 6th switching tube (
S 6) source electrode, first switching tube (
S 1) source electrode be connected in respectively the second switch pipe (
S 2) drain electrode and electrical network (
u G ) an end, the 3rd switching tube (
S 3) source electrode be connected in respectively the 4th switching tube (
S 4) drain electrode and first inductance (
L 1) an end, the 5th switching tube (
S 5) source electrode be connected in respectively the 6th switching tube (
S 6) drain electrode and second inductance (
L 2) an end, first inductance (
L 1) the other end be connected in respectively second inductance (
L 2) the other end and electrical network (
u G ) the other end.
In preferred embodiment of the present invention, said output filter circuit (50) also comprise isolating transformer (
T), said isolating transformer (
T) former limit winding an end and first inductance (
L 1) the other end and second inductance (
L 2) the other end link to each other, isolating transformer (
T) former limit winding the other end and first switching tube (
S 1) source electrode and second switch pipe (
S 2) drain electrode link to each other, isolating transformer (
T) the secondary winding two ends respectively with electrical network (
u G ) two ends link to each other.
Further, in the described crisscross parallel combining inverter, first, second switching tube in said first inverter bridge leg (20) (
S 1,
S 2) be the low frequency switching tube, its switching frequency and line voltage (
u G ) frequency equates, the 3rd, the 4th, the 5th, the 6th switching tube in said second inverter bridge leg (30) and the 3rd inverter bridge leg (40) (
S 3,
S 4,
S 5,
S 6) be the HF switch pipe.
As second purpose of the present invention, the present invention also provides the control method of above-mentioned crisscross parallel combining inverter, and the control procedure of this control method is following:
When second inverter bridge leg (30) is worked, the 3rd, the 4th switching tube (
S 3,
S 4) complementary conducting;
When the 3rd inverter bridge leg (40) is worked, the 5th, the 6th switching tube (
S 5,
S 6) complementary conducting;
When inverter power output during greater than semi-load, second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are worked simultaneously, and the 3rd switching tube (
S 3) and the 5th switching tube (
S 5) staggered 180 ° of conductings, the 4th switching tube (
S 4) and the 6th switching tube (
S 6) staggered 180 ° of conductings;
When inverter power output during less than semi-load; Second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are not worked simultaneously; During second inverter bridge leg (30) work, the 3rd inverter bridge leg (40) is not worked, during the 3rd inverter bridge leg (40) work; Second inverter bridge leg (30) is not worked, and second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are started working or be engraved in when out-of-work line voltage (
u G ) zero crossing constantly.
The present invention who obtains according to such scheme has the following advantages:
(1) adopts crisscross parallel combining inverter of the present invention can effectively improve the efficient of inverter under the underloading condition, thereby improve the generating efficiency of overall optical photovoltaic grid-connected system;
(2) two brachium pontis of crisscross parallel are independently of one another, during one of them brachium pontis fault an other brachium pontis do not had influence, thereby significantly improve the reliability of combining inverter, make it have certain fault-tolerant ability;
When (3) brachium pontis of crisscross parallel is worked simultaneously, help reducing the harmonic content of grid-connected current, improve the waveform quality of grid-connected current;
(4) through crisscross parallel, can realize the expansion of combining inverter capacity very easily.
Description of drawings
Further specify the present invention below in conjunction with accompanying drawing and embodiment.
Fig. 1 is the crisscross parallel combining inverter schematic diagram that does not contain isolating transformer for the present invention.
Fig. 2 is the crisscross parallel combining inverter schematic diagram that contains isolating transformer for the present invention.
Fig. 3 is crisscross parallel combining inverter specific embodiment control block diagram of the present invention.
Fig. 4 is the equivalent circuit theory figure of crisscross parallel combining inverter of the present invention when first, second inverter bridge leg is worked simultaneously.
Fig. 5 is the equivalent circuit theory figure of crisscross parallel combining inverter of the present invention when the first, the 3rd inverter bridge leg is worked simultaneously.
Symbol description among the figure: 10-power circuit; 20-the first inverter bridge leg; 30-the second inverter bridge leg; 40-the three inverter bridge leg; 50-filter circuit;
U In -input source;
C In -filter capacitor;
S 1 ,
S 2 ,
S 3 ,
S 4 ,
S 5 ,
S 6 The-first, second, third, fourth, the 5th and the 6th switching tube;
L 1 ,
L 2 -first, second inductance;
T-transformer;
u G -electrical network;
i L1
,
i L2
-first, second inductive current;
u GS1
,
u GS2
,
u GS3
,
u GS4
,
u GS5
,
u GS6
The drive signal of the-first, second, third, fourth, the 5th and the 6th switching tube.
Embodiment
For technological means, creation characteristic that the present invention is realized, reach purpose and effect and be easy to understand and understand, below in conjunction with concrete diagram, further set forth the present invention.
The specific embodiment of the invention comprises crisscross parallel combining inverter and control method two parts thereof.
The crisscross parallel combining inverter comprises power circuit (10), first inverter bridge leg (20), second inverter bridge leg (30), the 3rd inverter bridge leg (40) and filter circuit (50).
Wherein power circuit (10) by input source (
U In ) and filter capacitor (
C In ) constitute, first inverter bridge leg (20) by first, second switching tube (
S 1,
S 2) constitute, second inverter bridge leg (30) by the 3rd, the 4th switching tube (
S 3,
S 4) constitute, the 3rd inverter bridge leg (40) by the 5th, the 6th switching tube (
S 5,
S 6) constitute.
First, second switching tube in first inverter bridge leg (20) (
S 1,
S 2) be the low frequency switching tube, its switching frequency and line voltage (
u G ) frequency equates.
The the 3rd, the 4th, the 5th, the 6th switching tube in second inverter bridge leg (30) and the 3rd inverter bridge leg (40) (
S 3,
S 4,
S 5,
S 6) be the HF switch pipe.
Whether crisscross parallel combining inverter basis provided by the invention has isolating transformer comprises band isolating transformer crisscross parallel combining inverter and is not with two kinds of forms of isolating transformer combining inverter.
Not with the crisscross parallel combining inverter of isolating transformer shown in accompanying drawing 1, its filter circuit (50) by first, second inductance (
L 1,
L 2) constitute; Wherein: input source (
U In ) positive pole be connected in respectively filter capacitor (
C In ) an end, first switching tube (
S 1) drain electrode, the 3rd switching tube (
S 3) drain electrode and the 5th switching tube (
S 5) drain electrode, input source (
U In ) negative pole be connected in respectively filter capacitor (
C In ) the other end, second switch pipe (
S 2) source electrode, the 4th switching tube (
S 4) source electrode and the 6th switching tube (
S 6) source electrode; First switching tube (
S 1) source electrode be connected in respectively the second switch pipe (
S 2) drain electrode and electrical network (
u G ) an end, the 3rd switching tube (
S 3) source electrode be connected in respectively the 4th switching tube (
S 4) drain electrode and first inductance (
L 1) an end, the 5th switching tube (
S 5) source electrode be connected in respectively the 6th switching tube (
S 6) drain electrode and second inductance (
L 2) an end, first inductance (
L 1) the other end be connected in respectively second inductance (
L 2) the other end and electrical network (
u G ) the other end.
The crisscross parallel combining inverter that has isolating transformer shown in accompanying drawing 2, remove in its output filter circuit (50) comprise first, second inductance (
L 1,
L 2) in addition, also comprise isolating transformer (
T), wherein isolating transformer (
T) former limit winding an end and first inductance (
L 1) the other end and second inductance (
L 2) the other end link to each other, isolating transformer (
T) former limit winding the other end and first switching tube (
S 1) source electrode and second switch pipe (
S 2) drain electrode link to each other, isolating transformer (
T) the secondary winding two ends respectively with electrical network (
u G ) two ends link to each other.
As second portion of the present invention: crisscross parallel combining inverter control method, this control method is implemented based on the crisscross parallel combining inverter that such scheme forms, and it was specifically controlled and claimed as follows:
When second inverter bridge leg (30) is worked, the 3rd, the 4th switching tube (
S 3,
S 4) complementary conducting;
When the 3rd inverter bridge leg (40) is worked, the 5th, the 6th switching tube (
S 5,
S 6) complementary conducting;
When inverter power output during greater than semi-load, second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are worked simultaneously, and the 3rd switching tube (
S 3) and the 5th switching tube (
S 5) staggered 180 ° of conductings, the 4th switching tube (
S 4) and the 6th switching tube (
S 6) staggered 180 ° of conductings;
When inverter power output during less than semi-load; Second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are not worked simultaneously; During second inverter bridge leg (30) work, the 3rd inverter bridge leg (40) is not worked, during the 3rd inverter bridge leg (40) work; Second inverter bridge leg (30) is not worked, and second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are started working or be engraved in when out-of-work line voltage (
u G ) zero crossing constantly.
In the specific implementation, when combining inverter power output efficient is semi-load, second inverter bridge leg (30) and the 3rd inverter bridge leg (40) can adopt the line voltage of respectively working (
u G ) cycle the mode alternation, also can adopt half line voltage of respectively working (
u G ) the mode alternation in cycle, only can also adopt one of them inverter bridge leg to work and the idle always mode of another inverter bridge leg always.
Based on such scheme, the control principle of practical implementation of the present invention and the course of work such as Fig. 3 are to shown in Figure 5:
In specific embodiment of the present invention, first, second switching tube (
S 1,
S 2) select insulating gate type bipolar transistor (IGBT) for use, the 3rd, the 4th, the 5th, the 6th switching tube is selected mos field effect transistor (MOSFET) for use, switching frequency 50kHz, the control of combining inverter is accomplished by digital signal processor (DSP).
System's control block diagram is shown in accompanying drawing 3, and The whole control system comprises line voltage sample circuit, input voltage sample circuit, inductive current sample circuit, digital signal processor (DSP) and drive circuit.
Wherein digital signal processor (DSP) comprises functions such as phase-locked loop, inductive current adjusting, input voltage regulation, and it is made up of phase-locked loop, first error amplifier, current reference generation module, voltage reference generation module, second error amplifier, calculation process module, current-sharing adjustment module and PWM modulation module.
Phase-locked loop and current reference generation module join, and join with the line voltage sample circuit.First error amplifier and current reference generation module join and the voltage reference generation module joins, and join with the input voltage sample circuit.The current reference generation module connects second error amplifier.Calculation process module and current-sharing adjustment module and inductive current sample circuit join, and calculation process module and second error amplifier join, and current-sharing adjustment module and PWM modulation module join.Second error amplifier PWM modulation module that joins, the PWM modulation module connects drive circuit.
During the control system operation, line voltage sample circuit collection electrical network (
u G ) voltage, the input voltage sample circuit gather input source (
U In ) voltage, the inductive current sample circuit gather first, second inductance (
L 1,
L 2) first, second inductive current (
i L1
,
i L2
).
Digital signal processor (DSP) forms control signal corresponding according to the signal that above-mentioned sample circuit collects, and the drive signal of control Driver Circuit formation driving the first, second, third, fourth, the 5th and the 6th switching tube (
u GS1
,
u GS2
,
u GS3
,
u GS4
,
u GS5
,
u GS6
).According to driving signal, be achieved as follows control:
When the combining inverter power output greater than semi-load during power, all inverter bridge legs are all worked, wherein first inverter bridge leg low frequency switch work, second, third inverter bridge leg HF switch work.
When the combining inverter power output less than semi-load during power; First inverter bridge leg is low frequency operation still, and the work of a brachium pontis HF switch is only arranged in second, third inverter bridge leg, and the another one brachium pontis is not worked; When first, second inverter bridge leg is worked simultaneously; The combining inverter equivalent electric circuit is shown in accompanying drawing 4, and when the first, the 3rd inverter bridge leg was worked simultaneously, the combining inverter equivalent electric circuit was shown in accompanying drawing 5.
More than show and described basic principle of the present invention, principal character and advantage of the present invention.The technical staff of the industry should understand; The present invention is not restricted to the described embodiments; That describes in the foregoing description and the specification just explains principle of the present invention; Under the prerequisite that does not break away from spirit and scope of the invention, the present invention also has various changes and modifications, and these variations and improvement all fall in the scope of the invention that requires protection.The scope of the claimed invention by the appended claims and their equivalents defined
.
Claims (4)
1. crisscross parallel combining inverter; It is characterized in that; Said crisscross parallel combining inverter comprises power circuit (10), first inverter bridge leg (20), second inverter bridge leg (30), the 3rd inverter bridge leg (40) and filter circuit (50), wherein power circuit (10) by input source (
U In ) and filter capacitor (
C In ) constitute, first inverter bridge leg (20) by first, second switching tube (
S 1,
S 2) constitute, second inverter bridge leg (30) by the 3rd, the 4th switching tube (
S 3,
S 4) constitute, the 3rd inverter bridge leg (40) by the 5th, the 6th switching tube (
S 5,
S 6) constitute, filter circuit (50) by first, second inductance (
L 1,
L 2) constitute;
Wherein: input source (
U In ) positive pole be connected in respectively filter capacitor (
C In ) an end, first switching tube (
S 1) drain electrode, the 3rd switching tube (
S 3) drain electrode and the 5th switching tube (
S 5) drain electrode, input source (
U In ) negative pole be connected in respectively filter capacitor (
C In ) the other end, second switch pipe (
S 2) source electrode, the 4th switching tube (
S 4) source electrode and the 6th switching tube (
S 6) source electrode, first switching tube (
S 1) source electrode be connected in respectively the second switch pipe (
S 2) drain electrode and electrical network (
u G ) an end, the 3rd switching tube (
S 3) source electrode be connected in respectively the 4th switching tube (
S 4) drain electrode and first inductance (
L 1) an end, the 5th switching tube (
S 5) source electrode be connected in respectively the 6th switching tube (
S 6) drain electrode and second inductance (
L 2) an end, first inductance (
L 1) the other end be connected in respectively second inductance (
L 2) the other end and electrical network (
u G ) the other end.
2. a kind of crisscross parallel combining inverter according to claim 1 is characterized in that, said output filter circuit (50) also comprise isolating transformer (
T), said isolating transformer (
T) former limit winding an end and first inductance (
L 1) the other end and second inductance (
L 2) the other end link to each other, isolating transformer (
T) former limit winding the other end and first switching tube (
S 1) source electrode and second switch pipe (
S 2) drain electrode link to each other, isolating transformer (
T) the secondary winding two ends respectively with electrical network (
u G ) two ends link to each other.
3. a kind of crisscross parallel combining inverter according to claim 1 and 2 is characterized in that, in the described crisscross parallel combining inverter, first, second switching tube in said first inverter bridge leg (20) (
S 1,
S 2) be the low frequency switching tube, its switching frequency and line voltage (
u G ) frequency equates, the 3rd, the 4th, the 5th, the 6th switching tube in said second inverter bridge leg (30) and the 3rd inverter bridge leg (40) (
S 3,
S 4,
S 5,
S 6) be the HF switch pipe.
4. the control method of a crisscross parallel combining inverter is characterized in that, said control method is following:
When second inverter bridge leg (30) is worked, the 3rd, the 4th switching tube (
S 3,
S 4) complementary conducting;
When the 3rd inverter bridge leg (40) is worked, the 5th, the 6th switching tube (
S 5,
S 6) complementary conducting;
When inverter power output during greater than semi-load, second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are worked simultaneously, and the 3rd switching tube (
S 3) and the 5th switching tube (
S 5) staggered 180 ° of conductings, the 4th switching tube (
S 4) and the 6th switching tube (
S 6) staggered 180 ° of conductings;
When inverter power output during less than semi-load; Second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are not worked simultaneously; During second inverter bridge leg (30) work, the 3rd inverter bridge leg (40) is not worked, during the 3rd inverter bridge leg (40) work; Second inverter bridge leg (30) is not worked, and second inverter bridge leg (30) and the 3rd inverter bridge leg (40) are started working or be engraved in when out-of-work line voltage (
u G ) zero crossing constantly.
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|---|---|---|---|
| CN2011100326661A CN102624274A (en) | 2011-01-30 | 2011-01-30 | Interleaving parallel grid-connected inverter and control method thereof |
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|---|---|---|---|
| CN2011100326661A CN102624274A (en) | 2011-01-30 | 2011-01-30 | Interleaving parallel grid-connected inverter and control method thereof |
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|---|---|
| CN102624274A true CN102624274A (en) | 2012-08-01 |
Family
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| WO2013163780A1 (en) * | 2012-05-02 | 2013-11-07 | 上海康威特吉能源技术有限公司 | Alternately parallel-connected grid-connected inverter and control method therefor |
| CN103401267A (en) * | 2013-07-17 | 2013-11-20 | 天津大学 | Grid-connected circuit for small-sized wind-driven generator |
| CN103746588A (en) * | 2013-12-26 | 2014-04-23 | 安徽巨日华电新能源有限公司 | Combined type inverter |
| CN104009658A (en) * | 2014-05-28 | 2014-08-27 | 华为技术有限公司 | Power conversion circuit and power conversion system |
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