CN102593871B - Bus voltage regulating method and device for inverter - Google Patents
Bus voltage regulating method and device for inverter Download PDFInfo
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- CN102593871B CN102593871B CN201210065271.6A CN201210065271A CN102593871B CN 102593871 B CN102593871 B CN 102593871B CN 201210065271 A CN201210065271 A CN 201210065271A CN 102593871 B CN102593871 B CN 102593871B
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Abstract
The invention provides bus voltage regulating method and device for an inverter, relates to the technical field of power sources and improves the efficiency of the grid-connected inverter. The bus voltage regulating method for the inverter comprises the step of regulating a bus voltage value of the inverter in real time according to a voltage value of a power grid connected with the inverter and a grid-connected current value of the inverter, which are detected in real time. The bus voltage regulating device for the inverter comprises a regulating unit of the bus voltage, which is used for regulating the bus voltage value of the inverter in real time according to the voltage value of the power grid connected with the inverter and the grid-connected current value of the inverter, which are detected in real time.
Description
Technical field
The present invention relates to power technique fields, relate in particular to a kind of method of adjustment and device of inverter busbar voltage.
Background technology
The grid-connected condition of combining inverter is: the input voltage of inverter must be higher than the peak value of line voltage, for example, line voltage is 220V alternating current, crest voltage is 220*1.414=311V, the input voltage of inverter is greater than 311V so, and inverter is just likely poured into electrical network energy and gets on.Present combining inverter adopts bipolar structure conventionally, be that prime adds booster circuit, the voltage stabilizing of middle employing bus capacitor, rear class is inverter, in this structure, bus capacitor voltage is exactly the input voltage of inverter, and the input voltage of combining inverter will make its output busbar voltage meet the primary condition being incorporated into the power networks after booster circuit conversion.
In order to improve the efficiency of inverter in meeting the grid-connected condition of combining inverter, at present, combining inverter is control bus voltage carries out segmentation variation with the variation of line voltage for the method for adjustment of the voltage of bus, but the efficiency of the combining inverter under this method control is still not high.
Summary of the invention
Technical problem to be solved by this invention is to provide a kind of method of adjustment and device of inverter busbar voltage, improves the efficiency of combining inverter.
For solving the problems of the technologies described above, embodiments of the invention adopt following technical scheme:
A method of adjustment for inverter busbar voltage, comprising: the bus voltage value of adjusting in real time inverter according to the grid-connected current value of magnitude of voltage real-time detection and electrical network grid-connected inverters and inverter.
An adjusting device for inverter busbar voltage, comprising: the adjustment unit of busbar voltage, and for adjust in real time the bus voltage value of inverter according in real time that detect and the magnitude of voltage of electrical network grid-connected inverters and the grid-connected current value of inverter.
Method of adjustment and the device of the inverter busbar voltage that the embodiment of the present invention provides, line voltage and grid-connected inverters electric current are carried out to real-time detection, in the time that line voltage and grid-connected current change, adjust for the busbar voltage to inverter that the variation of line voltage and grid-connected current is real-time, with respect to the busbar voltage of only adjusting inverter in prior art by the variation of line voltage, the present invention adjusts the busbar voltage of inverter by the variation of the power output (being the product of line voltage and grid-connected current) of inverter, can further reduce the switching loss of switching tube in inverter, and then the efficiency of raising inverter.
Brief description of the drawings
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the method for adjustment flow chart of inverter busbar voltage in the embodiment of the present invention;
Fig. 2 is the schematic diagram that embodiment of the present invention median generatrix voltage changes with line voltage and grid-connected current;
Fig. 3 is the schematic diagram that embodiment of the present invention median generatrix voltage changes with grid-connected current;
Fig. 4 is the schematic diagram of embodiment of the present invention median generatrix voltage with grid voltage change;
Fig. 5 is the schematic diagram of the busbar voltage when saltus step of inverter power output in the embodiment of the present invention;
Fig. 6 is the schematic diagram of the adjusting device of inverter busbar voltage in the embodiment of the present invention;
Fig. 7 is the schematic diagram of the adjustment unit of embodiment of the present invention median generatrix voltage.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, the technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiment.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtaining under creative work prerequisite, belong to the scope of protection of the invention.
The embodiment of the present invention provides a kind of method of adjustment of inverter busbar voltage, and as shown in Figure 1, the method comprises:
101, adjust in real time the bus voltage value of inverter according in real time that detect and the magnitude of voltage of electrical network grid-connected inverters and the grid-connected current value of inverter.
Line voltage and grid-connected inverters electric current are carried out to real-time detection, in the time that line voltage and grid-connected current change, adjust for the busbar voltage to inverter that the variation of line voltage and grid-connected current is real-time, with respect to the busbar voltage of only adjusting inverter in prior art by the variation of line voltage, the present invention adjusts the busbar voltage of inverter by the variation of the power output (being the product of line voltage and grid-connected current) of inverter, can further reduce the switching loss of switching tube in inverter, and then improve the efficiency of inverter.
Method provided by the invention is carried out real-time adjustment according to the power output of inverter to the busbar voltage of inverter simultaneously, be the optimum voltage that immediately busbar voltage of inverter is adjusted into inverter bus under this power output after the power output of inverter changes, the variation of inverter busbar voltage is smoothly continuous.
Further, in embodiments of the present invention, the described basis bus voltage value that in real time that detect and the magnitude of voltage of electrical network grid-connected inverters and the grid-connected current value of inverter are adjusted inverter in real time comprises: adjust in real time bus voltage value and be line voltage peak value and line voltage increment and power network current increment with.
As shown in Figure 2, V
bUS=V
max+ α (V
out)+β (I
out), wherein V
bUSfor inverter bus voltage value, V
maxfor line voltage peak value, V
outfor line voltage value, I
outfor grid-connected current value, α (V
out) be line voltage increment, β (I
out) be power network current increment, if when line voltage is direct current, line voltage peak value is line voltage, if when line voltage is interchange, line voltage peak value is the product of line voltage value and 1.414.When inverter work, along with line voltage value V
outwith grid-connected current value I
outvariation, adjust in real time inverter busbar voltage V
bUS, obtain inverter busbar voltage V
bUS=V
max+ α (V
out)+β (I
out).
Described line voltage increment is in the situation that inverter output voltage changes, for ensureing the normal work of inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value, described line voltage increment is according to the particular value of described inverter running parameter setting or the function of line voltage;
Described power network current increment is in the situation that inverter power output changes, normally work for ensureing inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value and described line voltage increment, described power network current increment is according to the particular value of described inverter running parameter setting or the function of power network current.
In the time that line voltage does not change, inverter busbar voltage is followed the variation of grid-connected current and is changed; In the time that grid-connected current does not change, inverter busbar voltage is followed the variation of line voltage and is changed.
Optionally, in embodiments of the present invention, described line voltage increment is 40V, and described power network current increment is grid-connected current value.Be α (V
out)=V
out, β (I
out)=I
out, V
bUS=V
oax+ V
out+ 40V.As shown in Figure 3, as line voltage V
outwhile variation, inverter busbar voltage VB
uSfollow grid-connected current I
outvariation and change; As shown in Figure 4, in the time that grid-connected current does not change, inverter busbar voltage V
bUSfollow line voltage V
outvariation and change.
Further, in embodiments of the present invention, as described in Figure 5, be a lower-wattage P1 in described inverter power output by a higher-wattage P2 saltus step and be in the process of described higher-wattage P2 by described lower-wattage P1 saltus step again subsequently, described bus voltage value V
bUSpower network current increment when line voltage increment while being described higher-wattage P2 for line voltage peak value and inverter power output and inverter power output are described higher-wattage P2 and.In figure, dotted line is busbar voltage theoretical value V
bUS, and when frequent saltus step, starting to saltus step to finish from saltus step between P1 and P2 in inverter power output, it is constant that busbar voltage remains the bus voltage value that P2 orders, i.e. the line voltage actual value V2 of solid line representative in figure.Thereby avoid the switching shake at the situation Down Highway voltage of the frequent saltus step of inverter power output.
The method of adjustment of the inverter busbar voltage that the embodiment of the present invention provides, line voltage and grid-connected inverters electric current are carried out to real-time detection, in the time that line voltage and grid-connected current change, adjust for the busbar voltage to inverter that the variation of line voltage and grid-connected current is real-time, with respect to the busbar voltage of only adjusting inverter in prior art by the variation of line voltage, the present invention adjusts the busbar voltage of inverter by the variation of the power output (being the product of line voltage and grid-connected current) of inverter, can further reduce the switching loss of switching tube in inverter, and then the efficiency of raising inverter, simultaneously the in the situation that of the frequent saltus step of inverter power output, it is constant that control inverter busbar voltage remains on high value, avoid the switching shake of busbar voltage.
The embodiment of the present invention also provides a kind of adjusting device of inverter busbar voltage, as shown in Figure 6, comprise: the adjustment unit 11 of busbar voltage, for adjust in real time the bus voltage value of inverter according in real time that detect and the magnitude of voltage of electrical network grid-connected inverters and the grid-connected current value of inverter.
Further, as shown in Figure 7, the adjustment unit of described busbar voltage comprises: adjusting module 12, for adjust in real time bus voltage value be line voltage peak value and line voltage increment and power network current increment with;
Described line voltage increment is in the situation that inverter output voltage changes, for ensureing the normal work of inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value, described line voltage increment is according to the particular value of described inverter running parameter setting or the function of line voltage;
Described power network current increment is in the situation that inverter power output changes, normally work for ensureing inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value and described line voltage increment, described power network current increment is according to the particular value of described inverter running parameter setting or the function of power network current.
Further, described adjusting module is also for being a lower-wattage and the process that is described higher-wattage by described lower-wattage saltus step again subsequently in described inverter power output by a higher-wattage saltus step, the power network current increment when line voltage increment when adjusting described bus voltage value and be line voltage peak value and inverter power output and being described higher-wattage and inverter power output are described higher-wattage and.
The adjusting device of the inverter busbar voltage that the embodiment of the present invention provides, line voltage and grid-connected inverters electric current are carried out to real-time detection, in the time that line voltage and grid-connected current change, adjust for the busbar voltage to inverter that the variation of line voltage and grid-connected current is real-time, with respect to the busbar voltage of only adjusting inverter in prior art by the variation of line voltage, the present invention adjusts the busbar voltage of inverter by the variation of the power output (being the product of line voltage and grid-connected current) of inverter, can further reduce the switching loss of switching tube in inverter, and then the efficiency of raising inverter, simultaneously the in the situation that of the frequent saltus step of inverter power output, it is constant that control inverter busbar voltage remains on high value, avoid the switching shake of busbar voltage.
Through the above description of the embodiments, those skilled in the art can be well understood to the mode that the present invention can add essential common hardware by software and realize, and can certainly pass through hardware, but in a lot of situation, the former is better execution mode.Based on such understanding, the part that technical scheme of the present invention contributes to prior art in essence in other words can embody with the form of software product, this computer software product is stored in the storage medium can read, as the floppy disk of computer, hard disk or CD etc., comprise that some instructions are in order to make a computer equipment (can be personal computer, server, or the network equipment etc.) carry out the method described in each embodiment of the present invention.
The above; be only the specific embodiment of the present invention, but protection scope of the present invention is not limited to this, any be familiar with those skilled in the art the present invention disclose technical scope in; can expect easily changing or replacing, within all should being encompassed in protection scope of the present invention.Therefore, protection scope of the present invention should be as the criterion with the protection range of described claim.
Claims (6)
1. a method of adjustment for inverter busbar voltage, is characterized in that, comprising: the bus voltage value of adjusting in real time inverter according to the grid-connected current value of magnitude of voltage real-time detection and electrical network grid-connected inverters and inverter;
The described basis bus voltage value that in real time that detect and the magnitude of voltage of electrical network grid-connected inverters and the grid-connected current value of inverter are adjusted inverter in real time comprises: adjust in real time bus voltage value and be line voltage peak value and line voltage increment and power network current increment with;
Described line voltage increment is in the situation that inverter output voltage changes, for ensureing the normal work of inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value, described line voltage increment is according to function or the particular value of the line voltage of described inverter running parameter setting;
Described power network current increment is in the situation that inverter power output changes, normally work for ensureing inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value and described line voltage increment, described power network current increment is according to function or the particular value of the power network current of described inverter running parameter setting.
2. method according to claim 1, is characterized in that, described line voltage increment is 40V, and described power network current increment is grid-connected current value.
3. method according to claim 1, it is characterized in that, be in a lower-wattage and the process that is described higher-wattage by described lower-wattage saltus step again subsequently by a higher-wattage saltus step in described inverter power output, described bus voltage value be line voltage increment while being described higher-wattage of line voltage peak value and inverter power output and the inverter power output power network current increment while being described higher-wattage and.
4. an adjusting device for inverter busbar voltage, is characterized in that, comprising: the adjustment unit of busbar voltage, for adjust in real time the bus voltage value of inverter according in real time that detect and the magnitude of voltage of electrical network grid-connected inverters and the grid-connected current value of inverter;
The adjustment unit of described busbar voltage comprises: adjusting module, for adjust in real time bus voltage value be line voltage peak value and line voltage increment and power network current increment with;
Described line voltage increment is in the situation that inverter output voltage changes, for ensureing the normal work of inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value, described line voltage increment is according to function or the particular value of the line voltage of described inverter running parameter setting;
Described power network current increment is in the situation that inverter power output changes, normally work for ensureing inverter, the added value of described busbar voltage minimum on the basis of described line voltage peak value and described line voltage increment, described power network current increment is according to function or the particular value of the power network current of described inverter running parameter setting.
5. device according to claim 4, is characterized in that, described line voltage increment is 40V, and described power network current increment is grid-connected current value.
6. device according to claim 4, it is characterized in that, described adjusting module is also for being a lower-wattage and the process that is described higher-wattage by described lower-wattage saltus step again subsequently in described inverter power output by a higher-wattage saltus step, the power network current increment when line voltage increment when adjusting described bus voltage value and be line voltage peak value and inverter power output and being described higher-wattage and inverter power output are described higher-wattage and.
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| CN201210065271.6A CN102593871B (en) | 2012-03-13 | 2012-03-13 | Bus voltage regulating method and device for inverter |
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|---|---|---|---|
| CN201210065271.6A CN102593871B (en) | 2012-03-13 | 2012-03-13 | Bus voltage regulating method and device for inverter |
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| CN102593871B true CN102593871B (en) | 2014-08-20 |
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|---|---|---|---|---|
| CN201234142Y (en) * | 2008-06-06 | 2009-05-06 | 江苏津恒能源科技有限公司 | Bus control apparatus for solar photovoltaic grid connection DC-to-AC converter |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
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| US6410992B1 (en) * | 2000-08-23 | 2002-06-25 | Capstone Turbine Corporation | System and method for dual mode control of a turbogenerator/motor |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201234142Y (en) * | 2008-06-06 | 2009-05-06 | 江苏津恒能源科技有限公司 | Bus control apparatus for solar photovoltaic grid connection DC-to-AC converter |
| CN101841160A (en) * | 2009-03-19 | 2010-09-22 | 孔小明 | Grid-connection control method for solar photovoltaic power generation |
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