CN104467392A - Method and device for preventing five-level inverter bus overvoltage and photovoltaic system - Google Patents
Method and device for preventing five-level inverter bus overvoltage and photovoltaic system Download PDFInfo
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- CN104467392A CN104467392A CN201410799352.8A CN201410799352A CN104467392A CN 104467392 A CN104467392 A CN 104467392A CN 201410799352 A CN201410799352 A CN 201410799352A CN 104467392 A CN104467392 A CN 104467392A
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
- H02M1/00—Details of apparatus for conversion
- H02M1/32—Means for protecting converters other than automatic disconnection
- H02M1/325—Means for protecting converters other than automatic disconnection with means for allowing continuous operation despite a fault, i.e. fault tolerant converters
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/50—Photovoltaic [PV] energy
- Y02E10/56—Power conversion systems, e.g. maximum power point trackers
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Abstract
The invention discloses a method and device for preventing five-level inverter bus overvoltage and a photovoltaic system. The method includes the steps that the bus voltage of a five-level inverter is acquired; whether the bus voltage is higher than the highest permissible voltage on a bus or not is judged; when the bus voltage is higher than the highest permissible voltage on the bus, a front-stage Boost circuit of the five-level inverter is controlled to be stopped, a switching tube connecting a photovoltaic array with a network side in the five-level inverter is switched off, the five-level inverter is controlled to work in a three-level mode till the bus voltage of the five-level inverter is not higher than the highest permissible voltage, and therefore the five-level inverter bus voltage is prevented from being too high.
Description
Technical field
The present invention relates to technical field of photovoltaic power generation, more particularly, relate to one and prevent the superpotential method of five-electrical level inverter bus, device and photovoltaic system.
Background technology
The direct current side joint photovoltaic array 20 of five-electrical level inverter 10 shown in Fig. 1, in order to receive PV input voltage, described PV input voltage is connected across the positive pole of electric capacity C1 and the negative pole of electric capacity C2, and the voltage of C1, C2 opposing busbars mid point is respectively V1Pos and-V1Neg; Described PV input voltage is also connected across the positive pole of bus capacitor C3 and the negative pole of bus capacitor C4 after the boosting of the two-way Boost circuit of five-electrical level inverter 10 prime simultaneously, and the voltage of C3, C4 opposing busbars mid point is respectively V2Pos and-V2Neg.The net side of five-electrical level inverter 10 exports sends into electrical network through filter 30 filtering, transformer 40 after boosting, under the combination of different switching tube opening states, five-electrical level inverter 10 alternately exports zero level corresponding to+V1Pos ,-V1Neg ,+V2Pos ,-V2Neg level and bus mid point.
But; when causing PV input energy cannot arrive electrical network in time because of electric network fault; the energy piled up can be stored by bus capacitor C3 and bus capacitor C4, causes the busbar voltage of five-electrical level inverter 10 too high, and then causes fault of converter to shut down even module overvoltage demolition.
Summary of the invention
In view of this, the invention provides one and prevent the superpotential method of five-electrical level inverter bus, device and photovoltaic system, to prevent five-electrical level inverter busbar voltage too high.
One prevents the superpotential method of five-electrical level inverter bus, comprising:
Obtain the busbar voltage of five-electrical level inverter;
Judge that whether described busbar voltage is higher than the maximum permissible voltage on bus;
When described busbar voltage is higher than described maximum permissible voltage; the prime Boost circuit controlling described five-electrical level inverter is shut down; turn off in described five-electrical level inverter and connect photovoltaic array and the switching tube netting side; and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
Alternatively, when the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage, described method also comprises:
Control described prime Boost circuit to start, connect the switching tube of described connection photovoltaic array and net side, and control described five-electrical level inverter and be operated in five level active patterns.
One prevents the superpotential device of five-electrical level inverter bus, comprising:
Acquiring unit, for obtaining the busbar voltage of five-electrical level inverter;
Judging unit, for judging that whether described busbar voltage is higher than the maximum permissible voltage on bus;
And first processing unit; for when judging to obtain described busbar voltage higher than described maximum permissible voltage; the prime Boost circuit controlling described five-electrical level inverter is shut down; turn off in described five-electrical level inverter and connect photovoltaic array and the switching tube netting side; and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
Alternatively, described device also comprises: the second processing unit, for when the busbar voltage judging to obtain described five-electrical level inverter is not higher than described maximum permissible voltage, control described prime Boost circuit to start, connect the switching tube of described connection photovoltaic array and net side, and control described five-electrical level inverter and be operated in five level active patterns.
A kind of photovoltaic system, comprise photovoltaic array, two-way Boost circuit, five-electrical level inverter, filter and transformer, wherein, photovoltaic array described in the direct current side joint of described five-electrical level inverter, indirectly be connected with described photovoltaic array by described two-way Boost circuit simultaneously, its net side is connected with electrical network with described transformer through described filter, in addition:
Described photovoltaic system also comprises the controller be connected with described five-electrical level inverter with described two-way Boost circuit respectively, for obtaining the busbar voltage of described five-electrical level inverter, judge that whether described busbar voltage is higher than the maximum permissible voltage on bus, and when described busbar voltage is higher than described maximum permissible voltage, control described two-way Boost circuit to shut down, turn off in described five-electrical level inverter and connect described photovoltaic array and the switching tube netting side, and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
Alternatively, described controller is not also for when the busbar voltage of described five-electrical level inverter is higher than described maximum permissible voltage, control described prime Boost circuit to start, connect the switching tube of the input of described connection photovoltaic energy and net side, and control described five-electrical level inverter and be operated in five level active patterns.
Wherein, described filter is LCL type filter.
Wherein, described filter is LC mode filter.
Wherein, described LC mode filter has N number of filter capacitor branch road parallel with one another, wherein 2≤N;
Described LC mode filter also comprises: be connected on the damping resistance on each filter capacitor in M described filter capacitor branch road parallel with one another, wherein 1≤M≤N-1.
Alternatively, described LC mode filter also comprises: be connected in parallel on the by-pass inductor on damping resistance described in each.
As can be seen from above-mentioned technical scheme; the present invention is when five-electrical level inverter busbar voltage being detected higher than maximum permissible voltage on bus; the prime Boost circuit controlling described five-electrical level inverter is shut down; close the switching tube of connection breaking photovoltaic array and net side, and control described five-electrical level inverter and be operated in three level mode of operation.Now be disconnected completely because PV inputs energy, thus avoid busbar voltage and continue to raise, the energy be stored on bus capacitor is also transported on electrical network gradually, thus busbar voltage is reduced gradually, until return to normal value.
Accompanying drawing explanation
In order to be illustrated more clearly in the embodiment of the present invention or technical scheme of the prior art, be briefly described to the accompanying drawing used required in embodiment or description of the prior art below, apparently, accompanying drawing in the following describes is only some embodiments of the present invention, for those of ordinary skill in the art, under the prerequisite not paying creative work, other accompanying drawing can also be obtained according to these accompanying drawings.
Fig. 1 is a kind of photovoltaic system structural representation disclosed in prior art;
Fig. 2 one disclosed in the embodiment of the present invention prevents the superpotential method flow diagram of five-electrical level inverter bus;
Fig. 3 is that disclosed in the embodiment of the present invention, another prevents the superpotential method flow diagram of five-electrical level inverter bus;
Fig. 4 one disclosed in the embodiment of the present invention prevents the superpotential apparatus structure schematic diagram of five-electrical level inverter bus;
Fig. 5 is a kind of photovoltaic system structural representation disclosed in the embodiment of the present invention;
Fig. 6 is a kind of LC mode filter structural representation disclosed in the embodiment of the present invention.
Embodiment
Below in conjunction with the accompanying drawing in the embodiment of the present invention, be clearly and completely described the technical scheme in the embodiment of the present invention, obviously, described embodiment is only the present invention's part embodiment, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, belong to the scope of protection of the invention.
See Fig. 2, the embodiment of the invention discloses one and prevent the superpotential method of five-electrical level inverter bus, to prevent five-electrical level inverter busbar voltage too high, comprising:
Step 201: the busbar voltage obtaining five-electrical level inverter;
Step 202: judge that whether described busbar voltage is higher than the maximum permissible voltage on bus; When described busbar voltage is higher than described maximum permissible voltage, enters step 203, otherwise return step 201;
Step 203: the prime Boost circuit controlling described five-electrical level inverter is shut down, turns off in described five-electrical level inverter the switching tube connecting photovoltaic array and net side, and controls described five-electrical level inverter and be operated in three level mode of operation;
Step 204: when obtaining and judge the busbar voltage of described five-electrical level inverter whether not higher than described maximum permissible voltage, if so, this controls to terminate, otherwise returns step 203.
Still see Fig. 1, under normal circumstances, five-electrical level inverter 10 is operated in five level active patterns, namely five-electrical level inverter 10 alternately export under the combination of different switching tube opening states+V1Pos ,-V1Neg, 0 ,+V2Pos and-V2Neg five level.When switching tube (or switching tube combination) the S1Pos conducting of the positive PV input voltage of connection network side and photovoltaic array 20, corresponding output level+V1Pos; When switching tube (or switching tube combination) the S1Neg conducting of the negative PV input voltage of connection network side and photovoltaic array 20, corresponding output level-V1Neg; When switching tube (or switching tube combination) the S0 conducting of connection network side and bus mid point, corresponding output level 0; When switching tube (or switching tube combination) the S2Pos conducting of connection network side and first via Boost circuit 50, corresponding output+V2Pos; When switching tube (or switching tube combination) the S2Neg conducting of connection network side and the second tunnel Boost circuit 60, corresponding output-V2Neg.
The busbar voltage of five-electrical level inverter 10 equals the voltage sum on bus capacitor C3 and bus capacitor C4, and size is V2Pos+V2Neg.When LVRT (Low voltage ride through occurs electrical network, low voltage crossing), ZVRT (Zero Voltage Ride Through, no-voltage is passed through) or HVRT (HighVoltage Ride Through, high voltage crossing) etc. fault time, input energy for avoiding PV to pile up on bus, the present embodiment takes following measure:
Control first via Boost circuit 50 and the second tunnel Boost circuit 60 are shut down, and turn off connecting photovoltaic array 20 switching tube S1Pos, S1Neg with net side, be now disconnected completely, thus avoid busbar voltage continuation and raise because PV inputs energy; Control S2Pos, S2Neg, S0 conducting in turn afterwards, five-electrical level inverter 10 is switched to three level mode of operation by five level active patterns, the energy be now stored on bus capacitor C3 and bus capacitor C4 can be transported on electrical network gradually, thus busbar voltage is reduced gradually, until return to normal value, to improve five-electrical level inverter reliability of operation.
As preferably, see Fig. 3, the embodiment of the invention discloses another and prevent the superpotential method of five-electrical level inverter bus, comprising:
Step 201: the busbar voltage obtaining five-electrical level inverter;
Step 202: judge that whether described busbar voltage is higher than the maximum permissible voltage on five-electrical level inverter bus; If so, enter step 203, otherwise return step 201;
Step 203: the prime Boost circuit controlling described five-electrical level inverter is shut down, turns off in described five-electrical level inverter the switching tube connecting photovoltaic array and net side, and controls described five-electrical level inverter and be operated in three level mode of operation;
Step 204: when obtaining and judge the busbar voltage of described five-electrical level inverter whether not higher than described maximum permissible voltage, if so, enter step 205, otherwise return step 203;
Step 205: control photovoltaic system and recover initial operating state, that is: control described prime Boost circuit and start, and connects the switching tube of described connection photovoltaic array and net side, and control described five-electrical level inverter and be operated in five level active patterns.
Compared to a upper embodiment, the present embodiment can when detecting that busbar voltage returns to normal value, control photovoltaic system and automatically switch to initial operating state, improve the automaticity preventing five-electrical level inverter bus overvoltage scheme, effectively reduce person works's intensity.
In addition it should be noted that, described in the application, prevent the superpotential method of five-electrical level inverter bus, also can expansive approach to multi-electrical level inverter field, as seven electrical level inverters, nine electrical level inverters etc.Its principle is similar, is all that the PV disconnecting inverter direct-flow side inputs energy input, reduces level active pattern, thus reach the needs reducing busbar voltage, realize the bus overvoltage protection of multi-electrical level inverter.
See Fig. 4, the embodiment of the invention also discloses one and prevent the superpotential device of five-electrical level inverter bus, comprising:
Acquiring unit 41, for obtaining the busbar voltage of five-electrical level inverter;
Judging unit 42, for judging that whether described busbar voltage is higher than the maximum permissible voltage on bus;
And first processing unit 43; for when judging to obtain described busbar voltage higher than described maximum permissible voltage; the prime Boost circuit controlling described five-electrical level inverter is shut down; turn off in described five-electrical level inverter and connect photovoltaic array and the switching tube netting side; and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
As preferably, still see Fig. 4, described device also comprises:
Second processing unit 44, for when the busbar voltage judging to obtain described five-electrical level inverter is not higher than described maximum permissible voltage, control described prime Boost circuit to start, connect the switching tube of described connection photovoltaic array and net side, and control described five-electrical level inverter and be operated in five level active patterns.
See Fig. 5, the embodiment of the invention discloses a kind of photovoltaic system, comprise five-electrical level inverter 10, photovoltaic array 20, filter 30, transformer 40, two-way Boost circuit 50 and controller 60, wherein:
The direct current side joint photovoltaic array 20 of five-electrical level inverter 10, is connected with photovoltaic array 10 by two-way Boost circuit 50 simultaneously indirectly, and its net side is connected with electrical network with transformer 40 through filter 30;
Controller 60 is connected with five-electrical level inverter 10 with two-way Boost circuit 50 respectively, for obtaining the busbar voltage of five-electrical level inverter 10, judge that whether described busbar voltage is higher than the maximum permissible voltage on bus, and when described busbar voltage is higher than described maximum permissible voltage, the prime Boost circuit controlling five-electrical level inverter 10 is shut down, turn off in described five-electrical level inverter and connect photovoltaic array 20 and the switching tube netting side, and control five-electrical level inverter 10 and be operated in three level mode of operation, until the busbar voltage of five-electrical level inverter 10 is not higher than described maximum permissible voltage.
As preferably, controller 60 is not also for when the busbar voltage of described five-electrical level inverter is higher than described maximum permissible voltage, control described prime Boost circuit to start, connect the switching tube of the input of described connection photovoltaic energy and net side, and control described five-electrical level inverter and be operated in five level active patterns.
Wherein, filter 30 is the LC mode filter shown in Fig. 5 preferably, comprises brachium pontis reactor L and filter capacitor C.For the five-electrical level inverter 10 adopting pulse modulation technology, must containing the harmonic component relevant with carrier wave in its output waveform, and then cause harmonic pollution, be therefore necessary to set up filter 30 with this part harmonic component of filtering at the outlet side of five-electrical level inverter 10.Wherein, filter capacitor C can adopt Y-connection, and triangle also can be adopted to connect the filter-capacitor circuit forming described LC mode filter, and Fig. 5 only with delta connection exemplarily.
As preferably, see Fig. 6, described LC mode filter has N number of filter capacitor branch road parallel with one another, wherein 2≤N; Described LC mode filter also comprises: be connected on the damping resistance R on each filter capacitor in M described filter capacitor branch road parallel with one another
d, wherein 1≤M≤N-1.As: the filter-capacitor circuit be made up of filter capacitor C in Fig. 5 is equivalent to the filter capacitor branch road of two shown in Fig. 6, comprises by filter capacitor C
f1the the first filter capacitor branch road formed, and by filter capacitor C
f2the the second filter capacitor branch road formed.
Arbitrary filter capacitor branch road of described LC mode filter can adopt Y-connection, triangle also can be adopted to connect, wherein there is damping resistance R
dfilter capacitor branch road can play damping action to differential mode resonance.The present embodiment is by being equivalent to multiple filter capacitor branch road be in parallel by the filter-capacitor circuit of described LC mode filter, and only series damping resistor R on partial branch wherein
d, thus reduce reduction filter-capacitor circuit in the impedance of high band, contribute to the filter effect improving described LC mode filter.In addition, when there is damping resistance R
dfilter capacitor branch road adopt Y-connection time, by being connected with bus capacitor mid point by star mid point, damping resistance R can be made
dall damping action is played to common mode resonance and differential mode resonance.
As preferably, still see Fig. 6, described LC mode filter also comprises: be connected in parallel on each damping resistance R
don by-pass inductor L
d.By-pass inductor L
dthere is by-pass overdamp resistance R
don the effect of low-frequency current, to reduce damping resistance R
dloss.
In addition, filter 30 also can adopt LCL filter, does not limit to.
In sum; the present invention is when five-electrical level inverter busbar voltage being detected higher than maximum permissible voltage on bus; the prime Boost circuit controlling described five-electrical level inverter is shut down; close the switching tube of connection breaking photovoltaic array and net side, and control described five-electrical level inverter and be operated in three level mode of operation.Now be disconnected completely because PV inputs energy, thus avoid busbar voltage and continue to raise, the energy be stored on bus capacitor is also transported on electrical network gradually, thus busbar voltage is reduced gradually, until return to normal value.
In this specification, each embodiment adopts the mode of going forward one by one to describe, and what each embodiment stressed is the difference with other embodiments, between each embodiment identical similar portion mutually see.For device disclosed in embodiment, because it corresponds to the method disclosed in Example, so description is fairly simple, relevant part illustrates see method part.
To the above-mentioned explanation of the disclosed embodiments, professional and technical personnel in the field are realized or uses the present invention.To be apparent for those skilled in the art to the multiple amendment of these embodiments, General Principle as defined herein when not departing from the spirit or scope of the embodiment of the present invention, can realize in other embodiments.Therefore, the embodiment of the present invention can not be restricted to these embodiments shown in this article, but will meet the widest scope consistent with principle disclosed herein and features of novelty.
Claims (10)
1. prevent the superpotential method of five-electrical level inverter bus, it is characterized in that, comprising:
Obtain the busbar voltage of five-electrical level inverter;
Judge that whether described busbar voltage is higher than the maximum permissible voltage on bus;
When described busbar voltage is higher than described maximum permissible voltage; the prime Boost circuit controlling described five-electrical level inverter is shut down; turn off in described five-electrical level inverter and connect photovoltaic array and the switching tube netting side; and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
2. method according to claim 1, is characterized in that, when the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage, also comprises:
Control described prime Boost circuit to start, connect the switching tube of described connection photovoltaic array and net side, and control described five-electrical level inverter and be operated in five level active patterns.
3. prevent the superpotential device of five-electrical level inverter bus, it is characterized in that, comprising:
Acquiring unit, for obtaining the busbar voltage of five-electrical level inverter;
Judging unit, for judging that whether described busbar voltage is higher than the maximum permissible voltage on bus;
And first processing unit; for when judging to obtain described busbar voltage higher than described maximum permissible voltage; the prime Boost circuit controlling described five-electrical level inverter is shut down; turn off in described five-electrical level inverter and connect photovoltaic array and the switching tube netting side; and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
4. device according to claim 3, it is characterized in that, described device also comprises: the second processing unit, for when the busbar voltage judging to obtain described five-electrical level inverter is not higher than described maximum permissible voltage, control described prime Boost circuit to start, connect the switching tube of described connection photovoltaic array and net side, and control described five-electrical level inverter and be operated in five level active patterns.
5. a photovoltaic system, comprise photovoltaic array, two-way Boost circuit, five-electrical level inverter, filter and transformer, wherein, photovoltaic array described in the direct current side joint of described five-electrical level inverter, indirectly be connected with described photovoltaic array by described two-way Boost circuit simultaneously, its net side is connected with electrical network with described transformer through described filter, it is characterized in that:
Described photovoltaic system also comprises the controller be connected with described five-electrical level inverter with described two-way Boost circuit respectively, for obtaining the busbar voltage of described five-electrical level inverter, judge that whether described busbar voltage is higher than the maximum permissible voltage on bus, and when described busbar voltage is higher than described maximum permissible voltage, control described two-way Boost circuit to shut down, turn off in described five-electrical level inverter and connect described photovoltaic array and the switching tube netting side, and control described five-electrical level inverter and be operated in three level mode of operation, until the busbar voltage of described five-electrical level inverter is not higher than described maximum permissible voltage.
6. system according to claim 5, it is characterized in that, described controller is not also for when the busbar voltage of described five-electrical level inverter is higher than described maximum permissible voltage, control described prime Boost circuit to start, connect the switching tube of the input of described connection photovoltaic energy and net side, and control described five-electrical level inverter and be operated in five level active patterns.
7. the system according to claim 5 or 6, is characterized in that, described filter is LCL type filter.
8. the system according to claim 5 or 6, is characterized in that, described filter is LC mode filter.
9. system according to claim 8, is characterized in that, described LC mode filter has N number of filter capacitor branch road parallel with one another, wherein 2≤N;
Described LC mode filter also comprises: be connected on the damping resistance on each filter capacitor in M described filter capacitor branch road parallel with one another, wherein 1≤M≤N-1.
10. system according to claim 9, is characterized in that, described LC mode filter also comprises: be connected in parallel on the by-pass inductor on damping resistance described in each.
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| CN110311581A (en) * | 2019-08-06 | 2019-10-08 | 阳光电源股份有限公司 | Inverter circuit control method, device and inverter |
| CN112821744A (en) * | 2021-03-25 | 2021-05-18 | 漳州科华技术有限责任公司 | Control method and system of converter with booster circuit |
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