CN205051361U - Photovoltaic power generation device based on heterogeneous inverter unit - Google Patents
Photovoltaic power generation device based on heterogeneous inverter unit Download PDFInfo
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- CN205051361U CN205051361U CN201520789601.5U CN201520789601U CN205051361U CN 205051361 U CN205051361 U CN 205051361U CN 201520789601 U CN201520789601 U CN 201520789601U CN 205051361 U CN205051361 U CN 205051361U
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- 238000010248 power generation Methods 0.000 title claims abstract description 11
- 238000000819 phase cycle Methods 0.000 claims abstract description 6
- 238000003491 array Methods 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims description 3
- 238000001914 filtration Methods 0.000 abstract description 8
- 238000010586 diagram Methods 0.000 description 6
- 238000004804 winding Methods 0.000 description 5
- 238000005516 engineering process Methods 0.000 description 3
- 230000009897 systematic effect Effects 0.000 description 3
- 229910052757 nitrogen Inorganic materials 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 2
- 229910052698 phosphorus Inorganic materials 0.000 description 2
- 230000000903 blocking effect Effects 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 238000001816 cooling Methods 0.000 description 1
- 238000000034 method Methods 0.000 description 1
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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 utility model provides a photovoltaic power generation device based on heterogeneous inverter unit, is including the direct current input unit who connects gradually, heterogeneous inverter unit, interchange filtering unit and transformer unit, direct current input unit is two sets of photovoltaic array a set of or that parallel, IGBT or MOSFET that heterogeneous inverter unit organized the number of phases >= 6 by N constitute that NPC type half -bridge unit is parallelly connected to be constituteed, and its each differing between mutually is the 360N degree, the filter capacitance who exchanges the filtering unit and be cross -over connection between the filter inductor that is established ties respectively by the output of each looks among the heterogeneous inverter unit and the adjacent looks of heterogeneous inverter unit constitutes, each group exchanges transformer leakage inductance equivalent the be LCL wave filter of filtering unit together with back level transformer unit, corresponding solenoid is provided according to heterogeneous inverter unit's the output number of phases in the former limit of transformer unit, and the corresponding looks of heterogeneous inverter unit output are received according to the phase sequence respectively with terminal to the head end of every looks solenoid, the utility model discloses effectively reduce to export harmonic content and output filtering parameter for the electric current stress of switch tube is less.
Description
Technical field
The utility model relates to technical field of photovoltaic power generation, is specifically related to a kind of photovoltaic power generation apparatus based on multi-phase inverter unit.
Background technology
Flourish along with China's photovoltaic industry, centralized inverter with advantages such as its high efficiency, low cost, easy cares in the large batch of application of China.But along with the development of high-power centralized inverter technology, the appearance of relevant national standard, proposes clear and definite requirement to the harmonic wave of inverter, and the harmonic wave namely requiring combining inverter to export must lower than 3%.In order to reach this standard, tradition two-level inverter system block diagram as shown in Figure 1, can only be realized by increase rear class filter sensibility reciprocal and system switching frequency, but under the constant prerequisite of unit current stress, improving rear class filter sensibility reciprocal will certainly cause inductance cost to increase, and inductance noise and inductance volume all can significantly rise, the stress simultaneously increasing switching frequency switch tube is had higher requirement, and switching tube is difficult to meet the demands at present.In order to meet the requirement of standard, overcoming Problems existing in two level simultaneously, in industry, the topological form of inverter being turned to many level.But in large-power occasions, hold quantitative limitation by single tube in multi-electrical level inverter, multi-electrical level inverter needs multi-machine parallel connection to run, but multi-machine parallel connection mode controlling mode is comparatively complicated, and failure rate is higher, and industrialization level is low, and cost remains high.
In addition, in order to pursue maximum electric energy conversion efficiency, owner wishes that centralized inverter has the function of multichannel MPPT, and two traditional level centralized inverters, by the restriction of topological structure, cannot solve this problem.The settling mode of this problem only has pattern blocking parallel technology to realize at present, but modular parallel technological industrialization needs to be strengthened further.
Summary of the invention
The utility model is for the problem in current electric equipment existing for cooling system, propose a kind of photovoltaic power generation apparatus based on multi-phase inverter unit, effectively reduce output harmonic wave (THD) content and output filtering parameter, make the current stress of switching tube less.
For achieving the above object, the utility model adopts following technical scheme:
Based on a photovoltaic power generation apparatus for multi-phase inverter unit, comprise the continuous input cell, multi-phase inverter unit, ac filter unit and the transformer unit that connect successively; Described continuous input cell is one group or arranged side by side two groups of photovoltaic arrays; Described multi-phase inverter unit forms NPC type half-bridge cells by IGBT or MOSFET of the N group number of phases >=6 and composes in parallel, and the difference between its each phase is 360/N degree; When the direct-flow input end of described multi-phase inverter unit connects one group of photovoltaic array, PV+ and PV-of photovoltaic array meets multi-phase inverter unit direct current input side P respectively and holds and N end, when the direct-flow input end of described multi-phase inverter unit connects two groups of photovoltaic arrays, PV1+ and PV1-of two groups of photovoltaic arrays meets multi-phase inverter unit DC side P respectively and holds and O end, and PV2+ and PV2-meets multi-phase inverter unit DC side O respectively and holds and N end; Between the filter inductance that described ac filter unit is connected respectively by the output of phase each in multi-phase inverter unit and the adjacent phase of multi-phase inverter unit, the filter capacitor of cross-over connection forms; Each group ac filter unit is equivalent to LCL filter together with the transformer leakage inductance of rear class transformer unit; The former limit of described transformer unit provides corresponding line bag according to the output number of phases of multi-phase inverter unit, and the head end of every phase line bag and end are received polyphase inverter unit by phase sequence respectively and exported corresponding phase.
The often group NPC type half-bridge cells of described multi-phase inverter unit is also parallel with one or more groups NPC type half-bridge cells.
The modulation system of described multi-phase inverter unit is the mode that stacked carrier wave combines with phase shift carrier wave.
When multi-phase inverter unit is six phase times, phase sequence is followed successively by A, X, B, Y, C, Z, the modulation system of described multi-phase inverter unit is: wherein the positive half cycle of A phase is by 0 degree of positive pole carrier modulation, A phase negative half period is by 0 degree of negative pole carrier modulation, the positive half cycle of X phase is by 180 degree of positive pole carrier modulation, X phase negative half period by 180 degree of negative pole carrier modulation, A phase modulating wave and X phase modulating wave mutual deviation 180 degree; Modulator approach and A, X of all the other B phases and Y phase, C phase and Z phase are similar, and just modulating wave changes by phase relation described before.
The output phase voltage U of described multi-phase inverter unit
aXbe poor with X phase three level waveform by A phase three level waveform, it exports phase voltage U
aXwaveform presents 5 level PWM voltage waveforms, and level quantity is double.
Compared to the prior art comparatively, the utility model possesses following advantage:
(1) in topological structure of the present utility model, inversion unit is composed in parallel by multi-phase inverter brachium pontis, and often export mutually and all adopt both arms modulation to export, so output level number is many, output harmonic wave (THD) content and output filtering parameter can be effectively reduced.
(2) in the utility model, inversion unit have employed the form of heterogeneous brachium pontis parallel connection, makes the current stress of switching tube less.
(3) due to the accessible two-way photovoltaic module of direct current input in topological structure, so this system can realize two-way MPPT function.
Accompanying drawing explanation
Fig. 1 tradition centralized inverter systematic schematic diagram.
Fig. 2 multi-phase inverter systematic schematic diagram.
The novel inversion unit basic topology of Fig. 3.
Fig. 4 multi-phase inverter system transformer unit schematic diagram.
The basic inversion unit of Fig. 5 sends out ripple modulation system.
The basic inversion unit of Fig. 6 exports phase voltage.
The novel inversion unit of Fig. 7 improves topology.
Fig. 8 improves inversion unit and sends out ripple modulation system.
Fig. 9 improves inversion unit and exports phase voltage.
Embodiment
Be illustrated in figure 2 multi-phase inverter systematic schematic diagram, as shown in the figure, a kind of photovoltaic power generation apparatus based on multi-phase inverter unit, comprises the continuous input cell, multi-phase inverter unit, ac filter unit and the transformer unit that connect successively.
Be illustrated in figure 3 multi-phase inverter unit basic topology figure, described continuous input cell can be the direct-flow input end that a road or two-way photovoltaic array access the multi-phase inverter unit of its rear class side by side.When the direct-flow input end of described multi-phase inverter unit connects one group of PV array, its PV+ and PV-connects multi-phase inverter unit direct current input side P, N end respectively, when the direct-flow input end of described multi-phase inverter unit connects two groups of PV arrays, its PV1+ and PV1-connects multi-phase inverter unit DC side P, O end respectively, and PV2+ and PV2-connects multi-phase inverter unit DC side O, N end respectively.
Described multi-phase inverter unit forms NPC type half-bridge cells by N group (number of phases >=6) IGBT or MOSFET and forms.Difference between its each phase is 360/N degree.
Described multi-phase inverter unit rear class is connected to and exchanges output filtering unit.This filter unit is made up of the output of phase each in multi-phase inverter unit cross-over connection one filter capacitor between a filter inductance and adjacent phase of connecting respectively.Each group ac filter unit is equivalent to LCL filter together with the transformer leakage inductance of rear class transformer unit.
The access grid-connected transformer of described output filtering unit rear class.The former limit of described transformer unit provides corresponding line bag according to the output number of phases of multi-phase inverter unit, and the head end of every phase line bag and end are received polyphase inverter unit by phase sequence respectively and exported corresponding phase.
Fig. 4 is multi-phase inverter system transformer unit schematic diagram, there are three groups of windings on the former limit of described transformer unit, be connected with three groups of outputs of inverter unit respectively, i.e. A, X and transformer unit first winding switching, B, Y and transformer unit second winding switching, C, Z are connected with the transformer unit tertiary winding.Three out splice going splices of the vice-side winding of described transformer unit are all from a bus Parallel opertation.
Fig. 5 is that basic inversion unit sends out ripple modulation system, and the modulation system of described multi-phase inverter unit is the mode that stacked carrier wave combines with phase shift carrier wave.As shown in the figure, inversion unit is for six, phase sequence is followed successively by A, X, B, Y, C, Z, the modulation system of its inversion unit is: wherein the positive half cycle of A phase is modulated by 0 degree of positive pole carrier wave (Z-up-0), A phase negative half period is modulated by 0 degree of negative pole carrier wave (Z-down-0), the positive half cycle of X phase is modulated by 180 degree of positive pole carrier waves (Z-up-180), X phase negative half period is modulated by 180 degree of negative pole carrier waves (Z-down-180), A phase modulating wave (UA) and X phase modulating wave (UX) mutual deviation 180 degree; Modulator approach and A, X of all the other B phases and Y phase, C phase and Z phase are similar, and just modulating wave changes by phase relation described before.
Fig. 6 is that basic inversion unit exports phase voltage.As shown in the figure, the output phase voltage U of described multi-phase inverter unit
aX, this voltage is poor with X phase three level waveform by A phase three level waveform, and it exports phase voltage U
aXwaveform presents 5 level PWM voltage waveforms, and level quantity is double.
As shown in Figure 7, described inversion unit topology is improved, the often group NPC type half-bridge cells of described multi-phase inverter unit is also parallel with one or more groups NPC type half-bridge cells.Concrete, difference A2, X2, B2, Y2, C2, Z2 brachium pontis in parallel on the basis of A1, X1, B1, Y1, C1, Z1 six basic brachium pontis.Wherein A1 arm exports and exports after inductance in parallel with A2 arm, is combined as A phase and exports, and uses the same method and is combined into all the other 5 phases outputs.
The modulation system of inversion unit topology is improved as shown in Figure 8 shown in Fig. 7.A1, A2 arm adopts Interleaved control, its carrier phase difference 90 degree.Wherein the positive half cycle of A1 phase is modulated by 0 degree of positive pole carrier wave (Z-up-0), A1 phase negative half period is modulated by 0 degree of negative pole carrier wave (Z-down-0), the positive half cycle of X1 phase is modulated by 180 degree of positive pole carrier waves (Z-up-180), X1 phase negative half period is modulated by 180 degree of negative pole carrier waves (Z-down-180), the positive half cycle of A2 phase is modulated by 90 degree of positive pole carrier waves (Z-up-90), A2 phase negative half period is modulated by 90 degree of negative pole carrier waves (Z-down-90), the positive half cycle of X2 phase is modulated by 270 degree of positive pole carrier waves (Z-up-270), X2 phase negative half period is modulated by 270 degree of negative pole carrier waves (Z-down-270), A1 phase modulating wave is identical with A2 phase modulating wave, be UA, X1 phase modulating wave is identical with X2 phase modulating wave, be UX, and UA and UX mutual deviation 180 degree.The modulator approach of all the other B1, B2, Y1, Y2 and C1, C2, Z1, Z2 duplicates with A1, A2, X1, X2 phase, and just modulating wave changes by phase relation described before.
As shown in Figure 9, it is 9 level output voltage to the output phase voltage of the inversion unit of described improvement.AX output voltage is (UA1+UA2)/2-(UX1+UX2)/2.The more described basic inversion unit of level quantity has turned over one times.
Claims (3)
1. based on a photovoltaic power generation apparatus for multi-phase inverter unit, it is characterized in that: comprise the continuous input cell, multi-phase inverter unit, ac filter unit and the transformer unit that connect successively; Described continuous input cell is one group or arranged side by side two groups of photovoltaic arrays; Described multi-phase inverter unit forms NPC type half-bridge cells by IGBT or MOSFET of the N group number of phases >=6 and composes in parallel, and the difference between its each phase is 360/N degree; When the direct-flow input end of described multi-phase inverter unit connects one group of photovoltaic array, PV+ and PV-of photovoltaic array meets multi-phase inverter unit direct current input side P respectively and holds and N end, when the direct-flow input end of described multi-phase inverter unit connects two groups of photovoltaic arrays, PV1+ and PV1-of two groups of photovoltaic arrays meets multi-phase inverter unit DC side P respectively and holds and O end, and PV2+ and PV2-meets multi-phase inverter unit DC side O respectively and holds and N end; Between the filter inductance that described ac filter unit is connected respectively by the output of phase each in multi-phase inverter unit and the adjacent phase of multi-phase inverter unit, the filter capacitor of cross-over connection forms; Each group ac filter unit is equivalent to LCL filter together with the transformer leakage inductance of rear class transformer unit; The former limit of described transformer unit provides corresponding line bag according to the output number of phases of multi-phase inverter unit, and the head end of every phase line bag and end are received polyphase inverter unit by phase sequence respectively and exported corresponding phase.
2. a kind of photovoltaic power generation apparatus based on multi-phase inverter unit according to claim 1, is characterized in that: the often group NPC type half-bridge cells of described multi-phase inverter unit is also parallel with one or more groups NPC type half-bridge cells.
3. a kind of photovoltaic power generation apparatus based on multi-phase inverter unit according to claim 1, is characterized in that: the output phase voltage U of described multi-phase inverter unit
aXbe poor with X phase three level waveform by A phase three level waveform, it exports phase voltage U
aXwaveform presents 5 level PWM voltage waveforms, and level quantity is double.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201520789601.5U CN205051361U (en) | 2015-10-12 | 2015-10-12 | Photovoltaic power generation device based on heterogeneous inverter unit |
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| CN201520789601.5U CN205051361U (en) | 2015-10-12 | 2015-10-12 | Photovoltaic power generation device based on heterogeneous inverter unit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281364A (en) * | 2015-10-12 | 2016-01-27 | 特变电工西安电气科技有限公司 | Photovoltaic generating system based on multi-phase inversion unit |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105281364A (en) * | 2015-10-12 | 2016-01-27 | 特变电工西安电气科技有限公司 | Photovoltaic generating system based on multi-phase inversion unit |
| CN105281364B (en) * | 2015-10-12 | 2018-06-26 | 特变电工西安电气科技有限公司 | A kind of photovoltaic generating system based on multi-phase inverter unit |
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