CN105811465A - Photovoltaic grid-connected system - Google Patents
Photovoltaic grid-connected system Download PDFInfo
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- CN105811465A CN105811465A CN201610326907.6A CN201610326907A CN105811465A CN 105811465 A CN105811465 A CN 105811465A CN 201610326907 A CN201610326907 A CN 201610326907A CN 105811465 A CN105811465 A CN 105811465A
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- 238000001514 detection method Methods 0.000 claims abstract description 79
- 230000007935 neutral effect Effects 0.000 claims abstract description 7
- 230000003993 interaction Effects 0.000 claims description 11
- 239000004020 conductor Substances 0.000 claims description 4
- 230000008878 coupling Effects 0.000 description 3
- 238000010168 coupling process Methods 0.000 description 3
- 238000005859 coupling reaction Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 description 2
- 230000032683 aging Effects 0.000 description 2
- 229910021417 amorphous silicon Inorganic materials 0.000 description 2
- 238000006243 chemical reaction Methods 0.000 description 2
- 230000018109 developmental process Effects 0.000 description 2
- 238000007689 inspection Methods 0.000 description 2
- 238000012544 monitoring process Methods 0.000 description 2
- 229910021420 polycrystalline silicon Inorganic materials 0.000 description 2
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- 239000011159 matrix material Substances 0.000 description 1
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- H02J3/383—
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- H02J3/385—
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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
Abstract
The invention discloses a photovoltaic grid-connected system. The system comprises a photovoltaic array, an inverter and a public grid. The inverter comprises an input DC voltage detection module, a DC filter, an inverting module, an AC active filter, an inverter output voltage detection module, an AC circuit breaker and a module for detecting voltage before connection of grids, which are connected with one another in sequence, and the input DC voltage detection module, the inverter output voltage detection module, the module for detecting the voltage before connection of the grids, the AC circuit breaker and a photovoltaic inverter grounding performance detection module are connected with a programmable logic controller; and the output end of the inverting module is connected with one end of the photovoltaic inverter grounding performance detection module, and the other end of the photovoltaic inverter grounding performance detection module is grounded and connected with an AC side neutral line. The system provided by the invention can detect DC voltage, inverter AC side voltage and grid AC side voltage before connection of the grids, so that matching imbalance can be effectively avoided, and safe and stable operation of the entire grid can be ensured.
Description
Technical field
The present invention relates to field of power electronics, particularly relate to a kind of photovoltaic parallel in system.
Background technology
When the non-renewable energy resources such as electric power, coal, oil are day by day exhausted, energy problem will become the bottleneck of restriction socio-economic development, and increasing country is sought for exploitation solar energy resources, seeks the new power of economic development.But existing photovoltaic module output voltage is low, electric current is high, electrical losses is big, output is low, and is output as direct current, therefore use need before solar energy power generating to carry out grid-connected.At present, photovoltaic parallel in system needs first by the mode connected with parallel connection, photovoltaic module to be connected into photovoltaic array, then the output of photovoltaic array being put together access inverter, the converting direct-current power into alternating-current power that photovoltaic array exports is transmitted directly in public electric wire net by inverter.In photovoltaic parallel in system, inverter is the core component of photovoltaic parallel in system, and whole grid-connected system is served conclusive effect by its safe handling.Existing photovoltaic parallel in system inverter had not both detected photovoltaic module output voltage, also without detection inverter output voltage, it is thus possible to causes that coupling is unbalance, affects the operation of whole electrical network.
Existing photovoltaic parallel in system mainly includes centralized grid-connected system and group string data grid-connected system.In centralized grid-connected system, photovoltaic module matrix is through twice arrival inverter that confluxes, inverter maximal power tracing function (MPPT) can not monitor the ruuning situation of each road photovoltaic module, therefore each road photovoltaic module can not be made all in best operating point, when there being one piece of photovoltaic module break down or be blocked by shadow, the generating efficiency of whole system can be affected.In group string data grid-connected system, inverter quantity is many, and total failare rate can raise, and system monitoring difficulty is big；Electronic devices and components are more, and power device and signal circuit are on same plate, and design and the difficulty manufactured are big, relatively costly.
Summary of the invention
It is an object of the invention to provide a kind of photovoltaic parallel in system, this system have detected DC voltage, inverter ac side voltage and grid-connected front electrical network AC voltage, can be prevented effectively from coupling unbalance, it is ensured that the safe and stable operation of whole electrical network.
The technical solution adopted in the present invention is:
nullA kind of photovoltaic parallel in system，Including the photovoltaic array being made up of some photovoltaic modulies、The inverter being connected with photovoltaic array，And the public electric wire net being connected with inverter，Described inverter includes input direct voltage detection module、DC filter、Inversion module、Alternating current active wave filter、Inverter output voltage detection module、AC circuit breaker、Grid-connected front output voltage detection module、Programmable logic controller (PLC)、Photovoltaic DC-to-AC converter ground connection performance detection module，Described input direct voltage detection module、DC filter、Inversion module、Alternating current active wave filter、Inverter output voltage detection module、AC circuit breaker、Grid-connected front output voltage detection module is sequentially connected with，And input direct voltage detection module、Inverter output voltage detection module、Grid-connected front output voltage detection module、AC circuit breaker、Photovoltaic DC-to-AC converter ground connection performance detection module is connected with programmable logic controller (PLC)；One end of photovoltaic DC-to-AC converter ground connection performance detection module is connected with the outfan of inversion module, the other end ground connection of photovoltaic DC-to-AC converter ground connection performance detection module and being connected with the AC neutral conductor.
The DC voltage that photovoltaic array is sent by input direct voltage detection module detects, and the relevant information of detection is sent to programmable logic controller (PLC)；The output voltage of alternating current active wave filter is carried out real-time voltage detection by inverter output voltage detection module, and the relevant information of detection is sent to programmable logic controller (PLC)；Grid-connected front alternating voltage is carried out real-time voltage detection by grid-connected front output voltage detection module, and the relevant information of detection is sent to programmable logic controller (PLC)；Programmable logic controller (PLC) is by above-mentioned for reception information and compares；When grid-connected front alternating voltage is unsatisfactory for grid-connected voltage request, PLC controls AC circuit breaker disconnects；When the DC voltage that photovoltaic array is sent be unsatisfactory for direct current change to alternating voltage time, PLC controls AC circuit breaker disconnect；When the output voltage of alternating current active wave filter is unsatisfactory for grid-connected voltage request, PLC controls AC circuit breaker disconnects；When the DC voltage that photovoltaic array is sent meet direct current change to alternating voltage time, alternating current active wave filter output voltage meet grid-connected voltage request time, grid-connected before alternating voltage meet grid-connected voltage request time, it is achieved auto-parallel.
Further scheme is, described photovoltaic array includes some photovoltaic module unit arranged side by side, and each photovoltaic module unit includes the photovoltaic module of some series connection.Described photovoltaic module is the one of monocrystaline silicon solar cell, polysilicon solar cell or amorphous silicon thin-film solar cell, photovoltaic module conversion efficiency is not less than 14%, be not less than 25 years service life, attenuation rate in 2 years not higher than 2%, not higher than 20% in 25 years.
Further scheme is, is provided with and realizes multistage boosting purpose converters between photovoltaic array and inverter.
Further scheme is, described converters converters mainly includes MPPT controller and BOOST booster circuit；The voltage and current of photovoltaic array output is sent in MPPT controller and is carried out maximal power tracing control, makes photovoltaic array Maximum Power Output；Then inverter is sent into then through BOOST circuit after boosting.
Further scheme is, described programmable logic controller (PLC) is connected with human-computer interaction module, and human-computer interaction module realizes control command input and shows with operation information.Human-computer interaction module realizes the control of whole inverter, as adjusted invertor operation parameter etc..Human-computer interaction module can show relevant information in real time, as check inverter in real time/historical operational information, fault message etc..
Whether further scheme is, described photovoltaic DC-to-AC converter ground connection performance detection module is resistance or electric capacity, good to detect AC ground wire and neutral earthing.
The beneficial effects of the present invention is:
It is provided with 3 place's voltage detection module, DC voltage, the output voltage of alternating current active wave filter and the grid-connected front alternating voltage that detection photovoltaic array is sent respectively, and the relevant information of detection is sent to programmable logic controller (PLC), all kinds of voltages received are compared by programmable logic controller (PLC), when the DC voltage that photovoltaic array is sent meet direct current change to alternating voltage time, alternating current active wave filter output voltage meet grid-connected voltage request time, grid-connected before alternating voltage meet grid-connected voltage request time, it is achieved auto-parallel；
Output tandem photovoltaic inverter ground performance detection module at inversion module forms measure loop to complete the safety detection of grid-connected inverters, realize grid-connected safe self-inspection, substantially increase safety and reliability, solve in the past grid-connected cannot the problem of safe self-inspection；
Compared with centralized grid-connected system, The present invention reduces DC parallel quantity, reduce the loss that coupling that modules in parallel causes is unbalance, and adopt converters to realize the purpose of multistage boosting, even if each assembly installing space is different, setting angle is different, even at occur dirty, shade, aging, heat up, hot spot when, be also avoided that the impact of centralized grid-connected system " wooden pail effect ", improve the generating efficiency of photovoltaic parallel in system；
Compared with group string data grid-connected system, the present invention, only with an inverter, decreases the quantity of inverter, reduces system total failare rate, reduces system monitoring difficulty, saved cost.
Accompanying drawing explanation
Below in conjunction with drawings and Examples, the invention will be further described, in accompanying drawing:
Fig. 1 is the overall structure schematic diagram of photovoltaic parallel in system of the present invention；
Fig. 2 is the structural representation of inverter.
Wherein: 1, input direct voltage detection module, 2, DC filter, 3, inversion module, 4, alternating current active wave filter, 5, inverter output voltage detection module, 6, AC circuit breaker, 7, grid-connected front output voltage detection module, 8, programmable logic controller (PLC), 9, human-computer interaction module, 10, photovoltaic DC-to-AC converter ground connection performance detection module, 11, photovoltaic module, 12, converters, 13, inverter, 14, public electric wire net.
Detailed description of the invention
In order to make the purpose of the present invention, technical scheme and advantage clearly understand, below in conjunction with drawings and Examples, the present invention is further elaborated.Should be appreciated that specific embodiment described herein is only in order to explain the present invention, is not intended to limit the present invention.
Referring to Fig. 1 and Fig. 2, a kind of photovoltaic parallel in system, including the inverter 13 that the photovoltaic array being made up of some photovoltaic modulies 11 is connected with photovoltaic array, and the public electric wire net 14 being connected with inverter 13, between photovoltaic array and inverter 13, it is provided with converters 12.nullInverter 13 includes input direct voltage detection module 1、DC filter 2、Inversion module 3、Alternating current active wave filter 4、Inverter output voltage detection module 5、AC circuit breaker 6、Grid-connected front output voltage detection module 7、Programmable logic controller (PLC) 8、Human-computer interaction module 9、Photovoltaic DC-to-AC converter ground connection performance detection module 10，Input direct voltage detection module 1、DC filter 2、Inversion module 3、Alternating current active wave filter 4、Inverter output voltage detection module 5、AC circuit breaker 6、Grid-connected front output voltage detection module 7 is sequentially connected with，And input direct voltage detection module 1、Inverter output voltage detection module 5、Grid-connected front output voltage detection module 7、AC circuit breaker 6、Photovoltaic DC-to-AC converter ground connection performance detection module 10、Human-computer interaction module 9 is connected with programmable logic controller (PLC) 8；One end of photovoltaic DC-to-AC converter ground connection performance detection module 10 is connected with the outfan of inversion module 3, and the other end of photovoltaic DC-to-AC converter ground connection performance detection module 10 is connected with the AC neutral conductor, and the other end ground connection of photovoltaic DC-to-AC converter ground connection performance detection module 10.
The DC voltage that photovoltaic array is sent by input direct voltage detection module 1 detects, and the relevant information of detection is sent to programmable logic controller (PLC) 8；The output voltage of alternating current active wave filter 4 is carried out real-time voltage detection by inverter output voltage detection module 5, and the relevant information of detection is sent to programmable logic controller (PLC) 8；Grid-connected front alternating voltage is carried out real-time voltage detection by grid-connected front output voltage detection module 7, and the relevant information of detection is sent to programmable logic controller (PLC) 8；Programmable logic controller (PLC) 8 is by above-mentioned for reception information and compares；When grid-connected front alternating voltage is unsatisfactory for grid-connected voltage request, programmable logic controller (PLC) 8 controls AC circuit breaker and disconnects；When the DC voltage that photovoltaic array is sent be unsatisfactory for direct current change to alternating voltage time, programmable logic controller (PLC) 8 control AC circuit breaker disconnect；When the output voltage of alternating current active wave filter is unsatisfactory for grid-connected voltage request, programmable logic controller (PLC) 8 controls AC circuit breaker and disconnects；When the DC voltage that photovoltaic array is sent meet direct current change to alternating voltage time, alternating current active wave filter 4 output voltage meet grid-connected voltage request time, grid-connected before alternating voltage meet grid-connected voltage request time, it is achieved auto-parallel.Photovoltaic DC-to-AC converter ground connection performance detection module 10 it is in series with between inversion module output port place and earth lead, the neutral conductor, to form the measure loop including voltage source, obtain the electrical parameter values in described measure loop, the relevant information of detection is sent to programmable logic controller (PLC) 8 by photovoltaic DC-to-AC converter ground connection performance detection module 10, programmable logic controller (PLC) 8 by the electrical parameter values that receives compared with default value, to judge that whether grid-connected inverters circuit is normal, it is ensured that whole grid-connected safety and stablization.Human-computer interaction module 9 realizes control command input and shows with operation information, and namely human-computer interaction module 9 realizes the control to whole inverter, as adjusted invertor operation parameter etc.；Human-computer interaction module can also show relevant information in real time, as check inverter in real time/historical operational information, fault message etc..
In the present invention, described photovoltaic array includes some photovoltaic module unit arranged side by side, each photovoltaic module unit include some be cascaded identical towards photovoltaic module 11.Described photovoltaic module 11 is the one of monocrystaline silicon solar cell, polysilicon solar cell or amorphous silicon thin-film solar cell, photovoltaic module 11 conversion efficiency is not less than 14%, be not less than 25 years service life, attenuation rate in 2 years not higher than 2%, not higher than 20% in 25 years.
In the present invention, described converters mainly includes MPPT controller and BOOST booster circuit；The voltage and current of photovoltaic array output is sent in MPPT controller and is carried out maximal power tracing control, makes photovoltaic array Maximum Power Output；Then inverter is sent into then through BOOST circuit after boosting, reduce photovoltaic module output voltage and the unmatched situation of inverter, at utmost add generated energy, even if each assembly installing space is different, setting angle is different, even occur dirty, shade, aging, heat up, hot spot when, be also avoided that the impact of centralized grid-connected system " wooden pail effect ".Whether described photovoltaic DC-to-AC converter ground connection performance detection module 10 is resistance or electric capacity, good to detect AC ground wire and neutral earthing.
It should be appreciated that for those of ordinary skills, it is possible to improved according to the above description or converted, and all these are improved and convert the protection domain that all should belong to claims of the present invention.
Claims (6)
- null1. a photovoltaic parallel in system，Including the photovoltaic array being made up of some photovoltaic modulies、The inverter being connected with photovoltaic array，And the public electric wire net being connected with inverter，It is characterized in that: described inverter includes input direct voltage detection module、DC filter、Inversion module、Alternating current active wave filter、Inverter output voltage detection module、AC circuit breaker、Grid-connected front output voltage detection module、Programmable logic controller (PLC)、Photovoltaic DC-to-AC converter ground connection performance detection module，Described input direct voltage detection module、DC filter、Inversion module、Alternating current active wave filter、Inverter output voltage detection module、AC circuit breaker、Grid-connected front output voltage detection module is sequentially connected with，And input direct voltage detection module、Inverter output voltage detection module、Grid-connected front output voltage detection module、AC circuit breaker、Photovoltaic DC-to-AC converter ground connection performance detection module is connected with programmable logic controller (PLC)；One end of photovoltaic DC-to-AC converter ground connection performance detection module is connected with the outfan of inversion module, the other end ground connection of photovoltaic DC-to-AC converter ground connection performance detection module and being connected with the AC neutral conductor.
- 2. photovoltaic parallel in system according to claim 1, it is characterised in that: described photovoltaic array includes some photovoltaic module unit arranged side by side, and each photovoltaic module unit includes the photovoltaic module of some series connection.
- 3. photovoltaic parallel in system according to claim 1 and 2, it is characterised in that: it is provided with between photovoltaic array and inverter and realizes multistage boosting purpose converters.
- 4. photovoltaic parallel in system according to claim 3, it is characterised in that: described converters includes MPPT controller and BOOST booster circuit；The voltage and current of photovoltaic array output is sent in MPPT controller and is carried out maximal power tracing control, makes photovoltaic array Maximum Power Output；Then inverter is sent into then through BOOST circuit after boosting.
- 5. photovoltaic parallel in system according to claim 1, it is characterised in that: described programmable logic controller (PLC) is connected with human-computer interaction module.
- 6. photovoltaic parallel in system according to claim 1, it is characterised in that: described photovoltaic DC-to-AC converter ground connection performance detection module is resistance or electric capacity.
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Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111767A (en) * | 1998-06-22 | 2000-08-29 | Heliotronics, Inc. | Inverter integrated instrumentation having a current-voltage curve tracer |
| CN101867291A (en) * | 2009-04-17 | 2010-10-20 | 吕斌 | Household solar photovoltaic inverter |
| CN101950976A (en) * | 2010-08-25 | 2011-01-19 | 常熟开关制造有限公司(原常熟开关厂） | Grid-connected operation method of grid-connected type photovoltaic inverter |
| CN102097964A (en) * | 2011-03-14 | 2011-06-15 | 山东鲁冶瑞宝电气自动化有限公司 | Photovoltaic grid-connected inverter |
| CN202159982U (en) * | 2011-07-29 | 2012-03-07 | 宁波大学 | Solar photovoltaic grid-connected inverter based on digital signal processor (DSP) |
| CN103280826A (en) * | 2013-04-19 | 2013-09-04 | 华为技术有限公司 | Inverter grid connection security detection method and inverter grid connection circuit |
-
2016
- 2016-05-17 CN CN201610326907.6A patent/CN105811465B/en not_active Expired - Fee Related
Patent Citations (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6111767A (en) * | 1998-06-22 | 2000-08-29 | Heliotronics, Inc. | Inverter integrated instrumentation having a current-voltage curve tracer |
| CN101867291A (en) * | 2009-04-17 | 2010-10-20 | 吕斌 | Household solar photovoltaic inverter |
| CN101950976A (en) * | 2010-08-25 | 2011-01-19 | 常熟开关制造有限公司(原常熟开关厂） | Grid-connected operation method of grid-connected type photovoltaic inverter |
| CN102097964A (en) * | 2011-03-14 | 2011-06-15 | 山东鲁冶瑞宝电气自动化有限公司 | Photovoltaic grid-connected inverter |
| CN202159982U (en) * | 2011-07-29 | 2012-03-07 | 宁波大学 | Solar photovoltaic grid-connected inverter based on digital signal processor (DSP) |
| CN103280826A (en) * | 2013-04-19 | 2013-09-04 | 华为技术有限公司 | Inverter grid connection security detection method and inverter grid connection circuit |
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