CN104935012A - Low-voltage double-channel MPPT high-frequency isolation-type gird-connected inverter based on filter circuit - Google Patents
Low-voltage double-channel MPPT high-frequency isolation-type gird-connected inverter based on filter circuit Download PDFInfo
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- CN104935012A CN104935012A CN201510394972.8A CN201510394972A CN104935012A CN 104935012 A CN104935012 A CN 104935012A CN 201510394972 A CN201510394972 A CN 201510394972A CN 104935012 A CN104935012 A CN 104935012A
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Abstract
The invention discloses a low-voltage double-channel MPPT high-frequency isolation-type gird-connected inverter based on a filter circuit. The inverter comprises first primary direct-current electric energy, second primary direct-current electric energy, a first voltage reduction circuit, a second voltage reduction circuit, a high-frequency full-bridge inversion circuit, a rectification circuit, a full-bridge power frequency inversion circuit, a filter circuit, a sampling circuit, a display and communication module, a driving circuit and a control module. The first primary direct-current electric energy and the second primary direct-current electric energy are connected to the first voltage reduction circuit and the second voltage reduction circuit respectively. The first voltage reduction circuit and the second voltage reduction circuit are connected to a power grid through the high-frequency full-bridge inversion circuit, the rectification circuit, the full-bridge power frequency inversion circuit and the filter circuit which are successively connected respectively. The control module is connected to the first voltage reduction circuit and the second voltage reduction circuit through the sampling circuit. The control module is connected to the first voltage reduction circuit, the second voltage reduction circuit, the high-frequency full-bridge inversion circuit and the full-bridge power frequency inversion circuit respectively through the driving circuit.
Description
Technical field
The present invention relates to a kind of inverter, particularly relate to a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit, belong to power technique fields.
Background technology
In some middle-size and small-size grid-connected photovoltaic systems, often run into the roof of two not ipsilaterals to install solar energy
Cell panel, if the inverter using single channel maximal power tracing in this case, side needs two, if an inverter
On have two-way maximal power tracing function, one, side inverter just can meet the demands.And two general areas of roofing are different,
Minimum that has is equipped with two pieces of cell panels, and some roofings may be equipped with tens pieces of cell panels, and in this case, inverter at least
One tunnel input voltage range is just very low, simultaneously in order to realize electrical isolation and can support the use with any number of assembly, base
Low pressure two-way maximal power tracing high-frequency isolation type grid-connected inverter is developed in this.
Such as application number is a kind of combining inverter of " 201110093187.0 ", determines the threshold value judging to have N/R voltage in contactor based on DC input voitage and commercial power system voltage.Definite threshold, makes, when the operation of DC voltage converting circuit stops, when the output voltage values of DC voltage converting circuit is more than or equal to threshold value, to judge that contactor is as exception.When the output voltage based on DC voltage converting circuit judges contactor as exception, specific detectors is set without the need to additional.In addition, when contactor is abnormal, the voltage of the outlet side of DC voltage converting circuit become commercial power system voltage is carried out full-wave rectification after the voltage that obtains, therefore can not be subject to the impact of noise.
And for example application number is a kind of combining inverter of " 201310298445.8 ", comprise interconnective DC-DC circuit and DC-AC inverter bridge, also comprise phase-division based controller, described phase-division based controller controls described DC-AC inverter bridge and produces an offset current, the unsymmetrical current that the load AC port compensating described DC-AC inverter bridge by described offset current produces owing to connecting different loads, the electric current that described DC-AC inverter bridge is exported is identical with the electric current of load place, and the electric current that different DC-AC inverter bridge port exports is different.This invention can be favourable improvement three phase supply imbalance problem, simultaneously can reactive power needed for auto-compensation threephase load, this function inverter applications more, effect will be more obvious, power supply imbalance problem can be solved, reactive power compensation problem in the utilization realizing new forms of energy simultaneously, reduce the application of expensive active filter and reactive power compensator, for power department saves power supply cost, improve mains supply quality.
Summary of the invention
Technical problem to be solved by this invention provides a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit for the deficiency of background technology.
The present invention is for solving the problems of the technologies described above by the following technical solutions:
Based on a low pressure two-way MPPT high-frequency isolation type grid-connected inverter for filter circuit, comprise the first primary direct current energy, the second primary direct current energy, the first reduction voltage circuit, the second reduction voltage circuit, high frequency full bridge inverter, rectification circuit, full-bridge power frequency inverter circuit, filter circuit, sample circuit, display and communication module, drive circuit and control module; Described first primary direct current can be connected with the first reduction voltage circuit and the second reduction voltage circuit respectively with the second primary direct current, and described first reduction voltage circuit connects electrical network with the second reduction voltage circuit respectively by the high frequency full bridge inverter be connected successively, rectification circuit, full-bridge power frequency inverter circuit, filter circuit; Described control module connects the first reduction voltage circuit and the second reduction voltage circuit respectively by sample circuit, and described control module is connected with the first reduction voltage circuit, the second reduction voltage circuit, high frequency full bridge inverter, full-bridge power frequency inverter circuit respectively by drive circuit;
Described filter circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, operational amplifier, power supply, one end of described first resistance is connected with the output of full-bridge power frequency inverter circuit, be connected with one end of the second resistance after the other end of described first resistance connects one end of the first electric capacity and one end of the second electric capacity, be connected with the negative input end of operational amplifier behind one end of other end connection the 3rd resistance of described first electric capacity, the other end of described second electric capacity is also connected with the output of operational amplifier after connecing the other end of the 3rd resistance, the other end ground connection of described second resistance, the positive input terminal of described operational amplifier is connected in series ground connection after the 4th resistance and the 5th resistance successively, the positive power source terminal of operational amplifier is also connected with one end of the 6th resistance after connecing one end of the 3rd electric capacity, the other end of described 6th resistance is connected with the positive pole of power supply, the other end ground connection of described 3rd electric capacity, the negative power end of operational amplifier is also connected with one end of the 4th electric capacity after connecing one end of the 7th resistance, the other end of described 7th resistance is connected with the negative pole of power supply, the other end ground connection of described 4th electric capacity, be connected with electrical network after output serial connection the 5th electric capacity of described operational amplifier.
As the further preferred version of a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit of the present invention, the chip model of described control module is TMS320LF2407.
As the further preferred version of a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit of the present invention, described rectification circuit adopts half-wave rectifying circuit.
As the further preferred version of a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit of the present invention, described display and communication module comprise display unit and communication unit.
As the further preferred version of a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit of the present invention, described display unit adopts LED display.
The present invention adopts above technical scheme compared with prior art, has following technique effect:
1, the DC input voitage wide scope minimum voltage of technical solution of the present invention can reach 48 volts, and a road is minimum can be connect
Enter two pieces of series winding battery components, configuration battery component is more flexible; The input of two-way direct current can realize maximal power tracing separately
Function, two-way assembly can install different roofings; Adopt high frequency transformer to carry out electrical isolation, guarantee that system safety is reliable, negative pole or the plus earth of two-way direct current input can be realized simultaneously.
Accompanying drawing explanation
Fig. 1 is structure principle chart of the present invention;
Fig. 2 is filter circuit figure of the present invention.
Embodiment
Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:
As shown in Figure 1, the present invention designs a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit, comprises the first primary direct current energy, the second primary direct current energy, the first reduction voltage circuit, the second reduction voltage circuit, high frequency full bridge inverter, rectification circuit, full-bridge power frequency inverter circuit, filter circuit, sample circuit, display and communication module, drive circuit and control module; Described first primary direct current can be connected with the first reduction voltage circuit and the second reduction voltage circuit respectively with the second primary direct current, and described first reduction voltage circuit connects electrical network with the second reduction voltage circuit respectively by the high frequency full bridge inverter be connected successively, rectification circuit, full-bridge power frequency inverter circuit, filter circuit; Described control module connects the first reduction voltage circuit and the second reduction voltage circuit respectively by sample circuit, and described control module is connected with the first reduction voltage circuit, the second reduction voltage circuit, high frequency full bridge inverter, full-bridge power frequency inverter circuit respectively by drive circuit;
As shown in Figure 2, described filter circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, operational amplifier, power supply, one end of described first resistance is connected with the output of full-bridge power frequency inverter circuit, be connected with one end of the second resistance after the other end of described first resistance connects one end of the first electric capacity and one end of the second electric capacity, be connected with the negative input end of operational amplifier behind one end of other end connection the 3rd resistance of described first electric capacity, the other end of described second electric capacity is also connected with the output of operational amplifier after connecing the other end of the 3rd resistance, the other end ground connection of described second resistance, the positive input terminal of described operational amplifier is connected in series ground connection after the 4th resistance and the 5th resistance successively, the positive power source terminal of operational amplifier is also connected with one end of the 6th resistance after connecing one end of the 3rd electric capacity, the other end of described 6th resistance is connected with the positive pole of power supply, the other end ground connection of described 3rd electric capacity, the negative power end of operational amplifier is also connected with one end of the 4th electric capacity after connecing one end of the 7th resistance, the other end of described 7th resistance is connected with the negative pole of power supply, the other end ground connection of described 4th electric capacity, be connected with electrical network after output serial connection the 5th electric capacity of described operational amplifier.
Wherein, the chip model of described control module is TMS320LF2407, and described rectification circuit adopts half-wave rectifying circuit, and described display and communication module comprise display unit and communication unit, and described display unit adopts LED display.
Control core of the present invention adopts TMS320LF2407 chip; Prime two-way chopper circuit have Master control chip PWM10,
PWM12 controls; Full-bridge high-frequency inversion has PWM9 and PWM11 to control; Rear class adopts special integrated circuit UC2854 to carry out power frequency inversion; Two-way chopper circuit adopts current loop control mode.
A kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit, comprise the first primary direct current energy and the second primary direct current energy, described first primary direct current energy and described second primary direct current can output to the first reduction voltage circuit and the second reduction voltage circuit respectively, described first reduction voltage circuit is all connected with high frequency full bridge inverter with the output of described second reduction voltage circuit, described high frequency full bridge inverter is connected with rectification circuit, described rectification circuit is connected with full-bridge power frequency inverter circuit, described full-bridge power frequency inverter circuit is connected with filter circuit, the output of described filter circuit is connected to electrical network.Further, described second reduction voltage circuit is also connected with sample circuit, the output of described sample circuit is connected with control module, described control module is connected with drive circuit, the output of described drive circuit also respectively with reduction voltage circuit described in first, described second reduction voltage circuit, described high frequency full bridge inverter is connected with described full-bridge power frequency inverter circuit, and described control module is also interconnected with display and communication module.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
More than show and describe general principle of the present invention and 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; what describe in above-described embodiment and specification just illustrates principle of the present invention; without departing from the spirit and scope of the present invention; the present invention also has various changes and modifications, and these changes and improvements all fall in the claimed scope of the invention.Application claims protection range is defined by appending claims and equivalent thereof
Obviously, the above embodiment of the present invention is only for example of the present invention is clearly described, and is not the restriction to embodiments of the present invention.For those of ordinary skill in the field, can also make other changes in different forms on the basis of the above description.Here exhaustive without the need to also giving all execution modes.And these belong to connotation of the present invention the apparent change of extending out or variation still belong to protection scope of the present invention.
Claims (5)
1. the low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit, it is characterized in that, comprise the first primary direct current energy, the second primary direct current energy, the first reduction voltage circuit, the second reduction voltage circuit, high frequency full bridge inverter, rectification circuit, full-bridge power frequency inverter circuit, filter circuit, sample circuit, display and communication module, drive circuit and control module; Described first primary direct current can be connected with the first reduction voltage circuit and the second reduction voltage circuit respectively with the second primary direct current, and described first reduction voltage circuit connects electrical network with the second reduction voltage circuit respectively by the high frequency full bridge inverter be connected successively, rectification circuit, full-bridge power frequency inverter circuit, filter circuit; Described control module connects the first reduction voltage circuit and the second reduction voltage circuit respectively by sample circuit, and described control module is connected with the first reduction voltage circuit, the second reduction voltage circuit, high frequency full bridge inverter, full-bridge power frequency inverter circuit respectively by drive circuit;
Described filter circuit comprises the first resistance, second resistance, 3rd resistance, 4th resistance, 5th resistance, 6th resistance, 7th resistance, first electric capacity, second electric capacity, 3rd electric capacity, 4th electric capacity, 5th electric capacity, operational amplifier, power supply, one end of described first resistance is connected with the output of full-bridge power frequency inverter circuit, be connected with one end of the second resistance after the other end of described first resistance connects one end of the first electric capacity and one end of the second electric capacity, be connected with the negative input end of operational amplifier behind one end of other end connection the 3rd resistance of described first electric capacity, the other end of described second electric capacity is also connected with the output of operational amplifier after connecing the other end of the 3rd resistance, the other end ground connection of described second resistance, the positive input terminal of described operational amplifier is connected in series ground connection after the 4th resistance and the 5th resistance successively, the positive power source terminal of operational amplifier is also connected with one end of the 6th resistance after connecing one end of the 3rd electric capacity, the other end of described 6th resistance is connected with the positive pole of power supply, the other end ground connection of described 3rd electric capacity, the negative power end of operational amplifier is also connected with one end of the 4th electric capacity after connecing one end of the 7th resistance, the other end of described 7th resistance is connected with the negative pole of power supply, the other end ground connection of described 4th electric capacity, be connected with electrical network after output serial connection the 5th electric capacity of described operational amplifier.
2., according to a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit described in claim 1, it is characterized in that, the chip model of described control module is TMS320LF2407.
3. a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit according to claim 1, is characterized in that: described rectification circuit adopts half-wave rectifying circuit.
4. a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit according to claim 1, is characterized in that: described display and communication module comprise display unit and communication unit.
5. a kind of low pressure two-way MPPT high-frequency isolation type grid-connected inverter based on filter circuit according to claim 4, is characterized in that: described display unit adopts LED display.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201510394972.8A CN104935012A (en) | 2015-07-08 | 2015-07-08 | Low-voltage double-channel MPPT high-frequency isolation-type gird-connected inverter based on filter circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201510394972.8A CN104935012A (en) | 2015-07-08 | 2015-07-08 | Low-voltage double-channel MPPT high-frequency isolation-type gird-connected inverter based on filter circuit |
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| CN104935012A true CN104935012A (en) | 2015-09-23 |
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| CN201510394972.8A Pending CN104935012A (en) | 2015-07-08 | 2015-07-08 | Low-voltage double-channel MPPT high-frequency isolation-type gird-connected inverter based on filter circuit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107579586A (en) * | 2017-09-28 | 2018-01-12 | 无锡昊瑜节能环保设备有限公司 | A kind of ship power distribution control system based on intelligent controller |
| CN108631440A (en) * | 2018-05-11 | 2018-10-09 | 马鞍山市新桥工业设计有限公司 | A kind of long-range transformer substation system based on photovoltaic generation |
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| CN101325378A (en) * | 2008-03-26 | 2008-12-17 | 杭州中信网络自动化有限公司 | Circuit for eliminating DC component |
| CN102231608A (en) * | 2011-07-04 | 2011-11-02 | 浙江大学 | DC (direct current) loop-current suspension device for inverter parallel system |
| CN102638057A (en) * | 2012-04-24 | 2012-08-15 | 浙江大学 | Grid-connected inverter control device |
| CN103986355A (en) * | 2014-04-10 | 2014-08-13 | 苏州泽众新能源科技有限公司 | Low-voltage double-circuit MPPT high-frequency isolated type grid-connected inverter |
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2015
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN101325378A (en) * | 2008-03-26 | 2008-12-17 | 杭州中信网络自动化有限公司 | Circuit for eliminating DC component |
| CN102231608A (en) * | 2011-07-04 | 2011-11-02 | 浙江大学 | DC (direct current) loop-current suspension device for inverter parallel system |
| CN102638057A (en) * | 2012-04-24 | 2012-08-15 | 浙江大学 | Grid-connected inverter control device |
| CN103986355A (en) * | 2014-04-10 | 2014-08-13 | 苏州泽众新能源科技有限公司 | Low-voltage double-circuit MPPT high-frequency isolated type grid-connected inverter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN107579586A (en) * | 2017-09-28 | 2018-01-12 | 无锡昊瑜节能环保设备有限公司 | A kind of ship power distribution control system based on intelligent controller |
| CN108631440A (en) * | 2018-05-11 | 2018-10-09 | 马鞍山市新桥工业设计有限公司 | A kind of long-range transformer substation system based on photovoltaic generation |
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Application publication date: 20150923 |