CN102882227A - High-power photovoltaic grid-connected inverter - Google Patents
High-power photovoltaic grid-connected inverter Download PDFInfo
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- CN102882227A CN102882227A CN2012103394769A CN201210339476A CN102882227A CN 102882227 A CN102882227 A CN 102882227A CN 2012103394769 A CN2012103394769 A CN 2012103394769A CN 201210339476 A CN201210339476 A CN 201210339476A CN 102882227 A CN102882227 A CN 102882227A
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- 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 high-power photovoltaic grid-connected inverter, which comprises a plurality of pieces of direct current input, a plurality of inversion units, a convergent busbar and an alternating current circuit breaker, wherein the inversion units correspond to the direct current input one to one; each inversion unit comprises a direct current filtering module for filtering the corresponding direct current input, a booster module for boosting direct current voltage output by the direct current filtering module, an inversion module for converting the boosted direct current voltage into alternating current voltage, an alternating current filtering unit for filtering the boosted alternating current voltage, and a maximum power point tracking (MPPT) controller for controlling the corresponding booster module and the corresponding inversion module to endow the corresponding direct current input with optimal working voltage; the convergent busbar converges the alternating current voltage output by the inversion units; and the alternating current circuit breaker is arranged between the convergent busbar and a power grid.
Description
Technical field
Related to a kind of high power photovoltaic combining inverter among the present invention.
Background technology
Tradition and use more 100kw photovoltaic DC-to-AC converter and adopt single-stage integral type framework in the market, the former figure of its work as shown in Figure 1.This framework inverter generally only has one road MPPT controller, when shade blocks in case panel array occurs, the monoblock battery plate lost efficacy or local ageing decays, can affect the power output of integral battery door plate array, significantly reduces system's generating efficiency; The DC side link of not boosting in the conventional architectures, input voltage range is narrow, can not work under the low pressure, also can reduce the utilance of panel array; Because be the global monopolis formula, in case any one key components and parts breaks down, complete machine will be shut down, and waits for maintenance, and site examining and repairing is had relatively high expectations to the maintainer, and process is complicated, and maintenance time is long, affects the power benefit of photovoltaic plant.
Summary of the invention
The invention provides a kind of high power photovoltaic combining inverter, the risk that its generating efficiency declines to a great extent is little, can on-line maintenance when part breaks down.
The invention discloses a kind of high power photovoltaic combining inverter, it comprises: a plurality of direct current inputs; A plurality of inversion units, one of them inversion unit is corresponding one by one mutually with a direct current input, each inversion unit comprises: the DC filtering module, be used for direct current input is carried out filtering, boost module is used for and will boosts from the direct voltage that the DC filtering module is exported, inversion module, the rear direct voltage that is used for boosting changes alternating voltage into, the ac filter unit, and the alternating voltage after being used for boosting carries out filtering; The MPPT controller is used for boost module and inversion module are controlled so that each direct current input has best operating voltage; The busbar that confluxes, the alternating voltage that will export from a plurality of inversion units gathers; AC circuit breaker is arranged on and confluxes between busbar and the electrical network.
Preferably, between a plurality of described direct current inputs and described inversion unit, be provided with direct current anti-misconnection monitoring means.
Preferably, described direct current anti-misconnection monitoring means comprises the first via and the second tunnel parallel with one another, be provided with the backward diode that Zener diode, indicating device and a conducting direction of mutual series connection and Zener diode puncture opposite direction on the described first via, be provided with bypass resistance on described the second the tunnel.
Preferably, be provided with a circuit breaker on the output of multichannel primary voltage, this circuit breaker has a way control switch corresponding with arbitrary road of described multichannel primary voltage.
Preferably, it also comprises and is arranged on the electromagnetic interface filter that confluxes between busbar and the AC circuit breaker.
Preferably, it also comprises and is arranged on the isolating transformer that confluxes between busbar and the electromagnetic interface filter.
Preferably, it also comprises the lightning protection device that is arranged in parallel in each direct current input.
Preferably, it also comprises the earth protective device that is arranged between AC circuit breaker and the electrical network.
Preferably, described earth protective device comprises photovoltaic fuse, master cpu, leakage current sensor, leakage current sampling modulate circuit, ground connection cut-off switch; Described ground connection cut-off switch, described electricity leakage sensor and the described photovoltaic fuse ground connection that is in series; Described ground connection cut-off switch is connected with described master cpu by leakage current sampling modulate circuit with described leakage current sensor, is used for gathering the leakage current signal and passes to leakage current sampling modulate circuit processing; Described master cpu is connected with described ground connection cut-off switch, is used for receiving the leakage current signal after the leakage current sample circuit is processed and controls the folding of ground connection cut-off switch.
Preferably, it also comprises a cell panel, and described panel array is divided into a plurality of direct current inputs.
The present invention adopts above structure, has the following advantages:
1, because the input of many group direct currents is arranged, every group has one tunnel MPPT controller independently, it is so any that riches all the way gives birth to and to block, to lose efficacy or aging decay, only can affect the power stage of the cell plate group string on this road, and can not affect the normal output on other roads, thereby drop to the risk that system's generating efficiency declines to a great extent minimum;
2, because the input of many group direct currents is arranged, wide input voltage can increase the photovoltaic DC-to-AC converter operating voltage range, improves system's energy output, improves the power station returns of investment, and can adapt to more application scenario;
3, because the input of many group direct currents is arranged, when wherein one the road when breaking down, can be under non-stop-machine situation to Fast-Maintenance, even shutdown maintenance can not reduce power generation loss for the client, is that enterprise reduces;
4, be provided with direct current anti-misconnection monitoring means to prevent the misconnection of many group direct current incoming lines, avoid answering misconnection and the infringement that causes.
Description of drawings
Accompanying drawing 1 is high power photovoltaic combining inverter of the prior art.
Accompanying drawing 2 is the structural principle schematic diagram of first embodiment of the invention.
Accompanying drawing 3 is the structural principle schematic diagram of second embodiment of the invention.
Accompanying drawing 4 is the structural principle schematic diagram of the 3rd execution mode among the present invention.
Accompanying drawing 5 is the structural principle schematic diagram of four embodiment of the invention.
Accompanying drawing 6 is the structural principle schematic diagram in the inversion unit among the present invention.
Accompanying drawing 7 is installed in structural representation on the inverter for direct current anti-misconnection monitoring means among the present invention.
Accompanying drawing 8 is direct current anti-misconnection monitoring means internal structure schematic diagram among the present invention.
Accompanying drawing 9 is the structural principle schematic diagram of earth protective device among the present invention.
In the accompanying drawing: 11, inversion unit; 12, master cpu; 13, leakage current sampling modulate circuit; 14, ground connection cut-off switch; 15, leakage current sensor; 16, photovoltaic fuse; 17, film battery assembly; 18, electrical network; 20, dc switch; 21, alternating-current switch.
Embodiment
Below in conjunction with accompanying drawing preferred embodiment of the present invention is described in detail, thereby so that advantages and features of the invention can be easier to be it will be appreciated by those skilled in the art that protection scope of the present invention is made more explicit defining.
As shown in Figure 1, the first embodiment of the present invention, a kind of high power photovoltaic combining inverter, it comprises a plurality of direct current inputs, direct current anti-misconnection monitoring means, a plurality of inversion unit, the busbar that confluxes, AC circuit breaker.
A plurality of direct current inputs are formed by panel array.100kW inverter framework has the input of five road direct currents in this patent, and one the tunnel exchanges output.
Direct current anti-misconnection monitoring means is arranged between a plurality of direct current inputs and the inversion unit, can be by the analog quantity of the direct or indirect output of each testing circuit or the wiring correctness of amount of logic judgement end of incoming cables.
Direct current anti-misconnection monitoring means can detect the direct current primary voltage, first each road voltage is isolated respectively the sampling analog-to-digital conversion before the start after wiring, judges that by master control system its wiring corrects errors again.
Shown in Fig. 6 and 7, direct current anti-misconnection monitoring means can also comprise the primary voltage that multichannel links to each other with the input of inverter respectively, between the positive and negative terminal of every road primary voltage, be provided with a non-linear voltage testing circuit, the non-linear voltage testing circuit comprises the first via and the second tunnel parallel with one another, be provided with the Zener diode Z of mutual series connection on the first via, indicating device and a conducting direction and Zener diode Z puncture the backward diode D of opposite direction, be provided with bypass resistance R2 on the second the tunnel, bypass resistance can be configured to infinity in some cases, and namely the R2 position directly disconnects.
Indicating device can be various indicating circuits by Current Control, other various components and parts that have logic judging function or by analog quantity the operating state of inverter is judged such as LED lamp, optical coupled switch, calutron isolation output.In the present embodiment, indicating device is the LED lamp that is connected between Zener diode Z and the backward diode D.
Under normal condition, each road primary voltage is isolated mutually, not coupling between each testing circuit, and the positive and negative terminal of inverter is by Zener diode Z, and so that the LED lamp is bright and provide normal index signal.
When the positive and negative terminal phase mutual connection inverse time of inverter, the positive and negative terminal of inverter can not pass through backward diode D conducting, so that the LED lamp extinguishes and provides unusual index signal.If this moment, inverter is opened rashly, and backward diode D plays the effect of reverse protection to whole circuit.
When negative terminal or the positive anode phase mutual connection inverse time of the two-way of inverter or multichannel primary voltage, as shown in Figure 3, primary voltage be separately positioned on it on mutually connect.At this moment, all voltage detecting circuits are in series connection, because different parameter designing, their voltage detecting input equiva lent impedance can nonlinear variation occur owing to difference each other, produce larger difference, cause the voltage at each testing circuit two ends to produce larger difference.When the voltage of both sides in the non-linear voltage testing circuit of arbitrary road does not reach the puncture voltage of Zener diode Z, it is infinitely great that the resistance of Zener diode Z will become, so that electric current passes from bypass resistance R2, cause the LED lamp to extinguish, the output signal of indicating device is different, by analyzing output signal, can judge easily wiring error.Simultaneously, also can determine to make mistakes a little.
The output that is the multichannel primary voltage between multichannel primary voltage and described inverter is provided with a circuit breaker, and this circuit breaker has a way control switch corresponding with arbitrary road of described multichannel primary voltage.Because each circuit is independent respectively, can control use or remove all voltage detecting circuits by the control switch of simple circuit breaker, having 4 road primary voltages such as an inverter just only needs a disjunction with breaker control inversion of 4 way control switch to get final product, and this can significantly reduce unwanted losses.
Inversion unit is corresponding one by one mutually with a direct current input, namely by the input of a direct current just have one with its inversion unit that is electrically connected mutually.As shown in Figure 6, each inversion unit comprises DC filtering module, boost module, inversion module, ac filter unit, MPPT controller.The DC filtering module is used for direct current input is carried out filtering, boost module is used for and will boosts from the direct voltage that the DC filtering module is exported, inversion module changes alternating voltage into for the rear direct voltage that will boost, alternating voltage after the ac filter unit is used for boosting carries out filtering, and the MPPT controller is used for boost module and inversion module are controlled so that each direct current input has best operating voltage.
The busbar that confluxes is electrically connected mutually with a plurality of inversion units, and the alternating voltage that will export from a plurality of inversion units is aggregated into one tunnel output.
Be disposed with isolating transformer, electromagnetic interface filter, AC circuit breaker, earth protective device between busbar and the electrical network confluxing.
Isolating transformer is realized the isolation with electrical network.The electromagnetic interface filter filtering exchanges the high fdrequency component of output, improves the EMI performance of inverter.AC circuit breaker realizes and the clutch of electrical network having simultaneously overcurrent overheat unhook defencive function.
As shown in Figure 9, earth protective device comprises photovoltaic fuse 16, master cpu 12, leakage current sensor 15, leakage current sampling modulate circuit 13, ground connection cut-off switch 14;
Ground connection cut-off switch 14, electricity leakage sensor 15,16 series connection of photovoltaic fuse, photovoltaic fuse 16 ground connection; The ground connection cut-off switch is electrically connected film battery assembly 17.
Leakage current sensor 15 is connected with master cpu 12 by leakage current sampling modulate circuit 13, is used for gathering the leakage current signal and passes to leakage current sampling modulate circuit 13 processing;
Master cpu 12 is connected with ground connection cut-off switch 14, is used for receiving leakage current signal and 14 foldings of Based Intelligent Control ground connection cut-off switch after the leakage current sample circuit is processed.Earth protective device also comprises the dc switch 20 of being located on the direct current signal line and is located at alternating-current switch 21 on the AC signal line.
In the course of work, indirectly or directly leak electricity if occur, leakage current sensor 15 detects electric leakage signals and send to master cpu 12 after leakage current sampling modulate circuit 13 carries out signal condition at this moment, but master cpu 12 Intelligence Selection disconnect ground connection cut-off switch 14, dc switch 20, alternating-current switch 21.
When the components and parts such as direct electric leakage and ground connection cut-off switch 14, dc switch 20, alternating-current switch 21, master cpu 12, leakage current sensor 15, leakage current sampling modulate circuit 13 break down; when causing switch to disconnect; the disconnection defencive function is finished in 16 fusing of photovoltaic fuse.
Earth protective device comprises that also one is arranged on the dc switch 20 that is subjected to master control CPU12 control between film battery assembly 17 and the inversion unit 11.Earth protective device also comprises a dc switch 21 that is arranged on the output of inversion unit 11 and controlled by master control CPU12.
In the present embodiment, high power photovoltaic combining inverter also comprises the lightning protection device that is arranged in parallel in each direct current input.
As shown in Figure 3, in the second embodiment of the present invention, in the better situation of isolated instances, can save isolating transformer.
As shown in Figure 4, in the third embodiment of the present invention, in the better situation of the EMI performance of this high power photovoltaic combining inverter, can save electromagnetic interface filter.
As shown in Figure 5, in the fourth embodiment of the present invention, in the uncomplicated situation of some less demanding circuit, can save direct current anti-misconnection monitoring means, can judge that wiring corrects errors by the mode that instrument detects primary voltage manually.
The present invention adopts above structure, has the following advantages:
1, because the input of many group direct currents is arranged, every group has one tunnel MPPT controller independently, it is so any that riches all the way gives birth to and to block, to lose efficacy or aging decay, only can affect the power stage of the cell plate group string on this road, and can not affect the normal output on other roads, thereby drop to the risk that system's generating efficiency declines to a great extent minimum;
2, because the input of many group direct currents is arranged, wide input voltage can increase the photovoltaic DC-to-AC converter operating voltage range, improves system's energy output, improves the power station returns of investment, and can adapt to more application scenario;
3, because the input of many group direct currents is arranged, when wherein one the road when breaking down, can be under non-stop-machine situation to Fast-Maintenance, even shutdown maintenance can not reduce power generation loss for the client, is that enterprise reduces;
4, be provided with direct current anti-misconnection monitoring means to prevent the misconnection of many group direct current incoming lines, avoid answering misconnection and the infringement that causes.
More than specific embodiment of the present invention is illustrated in conjunction with diagram, clearly on the basis of not leaving scope and spirit of the present invention, can much revise prior art and technique.In the technical field, the common knowledge of a GPRS just can in technology main idea scope of the present invention, be carried out diversified change under of the present invention.
Claims (10)
1. high power photovoltaic combining inverter is characterized in that it comprises:
A plurality of direct current inputs;
A plurality of inversion units, one of them inversion unit is corresponding one by one mutually with a direct current input, and each inversion unit comprises the DC filtering module, is used for direct current input is carried out filtering; And boost module, be used for and will boost from the direct voltage that the DC filtering module is exported; And inversion module, the rear direct voltage that is used for boosting changes alternating voltage into; And the ac filter unit, the alternating voltage after being used for boosting carries out filtering; And the MPPT controller, be used for boost module and inversion module are controlled so that each direct current input has best operating voltage;
The busbar that confluxes, the alternating voltage that will export from a plurality of inversion units gathers;
AC circuit breaker is arranged on and confluxes between busbar and the electrical network.
2. high power photovoltaic combining inverter according to claim 1 is characterized in that: it also comprises the direct current anti-misconnection monitoring means that is arranged between a plurality of described direct currents inputs and the described inversion unit.
3. high power photovoltaic combining inverter according to claim 2, it is characterized in that: described direct current anti-misconnection monitoring means comprises the first via and the second tunnel parallel with one another, be provided with the backward diode that Zener diode, indicating device and a conducting direction of mutual series connection and Zener diode puncture opposite direction on the described first via, be provided with bypass resistance on described the second the tunnel.
4. high power photovoltaic combining inverter according to claim 3, it is characterized in that: it also comprises the circuit breaker on the output that is arranged on the multichannel primary voltage, and this circuit breaker has a way control switch corresponding with arbitrary road of described multichannel primary voltage.
5. high power photovoltaic combining inverter according to claim 1 is characterized in that: it also comprises and is arranged on the electromagnetic interface filter that confluxes between busbar and the AC circuit breaker.
6. high power photovoltaic combining inverter according to claim 4 is characterized in that: it also comprises and is arranged on the isolating transformer that confluxes between busbar and the electromagnetic interface filter.
7. high power photovoltaic combining inverter according to claim 1 is characterized in that: it also comprises the lightning protection device that is arranged in parallel in each direct current input.
8. high power photovoltaic combining inverter according to claim 1, it is characterized in that: it also comprises the earth protective device that is arranged between AC circuit breaker and the electrical network.
9. high power photovoltaic combining inverter according to claim 8 is characterized in that: described earth protective device comprises photovoltaic fuse, master cpu, leakage current sensor, leakage current sampling modulate circuit, ground connection cut-off switch; Described ground connection cut-off switch, described electricity leakage sensor and the described photovoltaic fuse ground connection that is in series; Described ground connection cut-off switch is connected with described master cpu by leakage current sampling modulate circuit with described leakage current sensor, is used for gathering the leakage current signal and passes to leakage current sampling modulate circuit processing; Described master cpu is connected with described ground connection cut-off switch, is used for receiving the leakage current signal after the leakage current sample circuit is processed and controls the folding of ground connection cut-off switch.
10. high power photovoltaic combining inverter according to claim 1, it is characterized in that: it also comprises a cell panel, described panel array is divided into a plurality of direct currents inputs.
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| CN103560541A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Fault ride-through control device and method for alternating/direct current mixed microgrid |
| CN103606960A (en) * | 2013-12-12 | 2014-02-26 | 国网上海市电力公司 | Distributed photovoltaic power station/power distribution station 380V bus grid-integration structure |
| CN103986192A (en) * | 2014-05-28 | 2014-08-13 | 阳光电源股份有限公司 | Non-isolation type photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system |
| WO2015184869A1 (en) * | 2014-10-23 | 2015-12-10 | 中兴通讯股份有限公司 | Inverter control method and inverter |
| CN106100571A (en) * | 2016-07-21 | 2016-11-09 | 南京南瑞继保电气有限公司 | A kind of group string data photovoltaic DC-to-AC converter exchange wiring construction in parallel and grid-connected unit |
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| CN106532650A (en) * | 2016-08-31 | 2017-03-22 | 苏州迈力电器有限公司 | Inverter protection circuit |
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| CN110739717A (en) * | 2018-07-19 | 2020-01-31 | 阳光电源股份有限公司 | kinds of intelligent photovoltaic modules and application system thereof |
| CN110880741A (en) * | 2019-12-02 | 2020-03-13 | 阳光电源股份有限公司 | Inversion system and input misconnection detection method of symmetrical three-level booster circuit of inversion system |
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| CN103560541A (en) * | 2013-11-16 | 2014-02-05 | 沈阳工业大学 | Fault ride-through control device and method for alternating/direct current mixed microgrid |
| CN103560541B (en) * | 2013-11-16 | 2015-10-14 | 沈阳工业大学 | A kind of alternating current-direct current mixing microgrid fault traversing control device and method |
| CN103606960A (en) * | 2013-12-12 | 2014-02-26 | 国网上海市电力公司 | Distributed photovoltaic power station/power distribution station 380V bus grid-integration structure |
| CN103986192A (en) * | 2014-05-28 | 2014-08-13 | 阳光电源股份有限公司 | Non-isolation type photovoltaic grid-connected inverter and photovoltaic grid-connected power generation system |
| CN103986192B (en) * | 2014-05-28 | 2016-05-25 | 阳光电源股份有限公司 | A kind of non-isolated photovoltaic grid-connected inverter and grid-connected photovoltaic system |
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| CN106100571A (en) * | 2016-07-21 | 2016-11-09 | 南京南瑞继保电气有限公司 | A kind of group string data photovoltaic DC-to-AC converter exchange wiring construction in parallel and grid-connected unit |
| CN106329486A (en) * | 2016-08-31 | 2017-01-11 | 苏州迈力电器有限公司 | Novel inverter protection circuit |
| CN106532650A (en) * | 2016-08-31 | 2017-03-22 | 苏州迈力电器有限公司 | Inverter protection circuit |
| CN106526408A (en) * | 2016-08-31 | 2017-03-22 | 苏州迈力电器有限公司 | Inverter protection circuit system |
| CN110739717A (en) * | 2018-07-19 | 2020-01-31 | 阳光电源股份有限公司 | kinds of intelligent photovoltaic modules and application system thereof |
| CN109119300A (en) * | 2018-10-29 | 2019-01-01 | 无锡尚德益家新能源有限公司 | Photovoltaic DC-to-AC converter switch for the shutdown of direct current branch |
| CN110880741A (en) * | 2019-12-02 | 2020-03-13 | 阳光电源股份有限公司 | Inversion system and input misconnection detection method of symmetrical three-level booster circuit of inversion system |
| CN111555652A (en) * | 2020-05-22 | 2020-08-18 | 中国矿业大学 | High-power-density converter and structure based on silicon carbide MOSFET module |
| WO2024021118A1 (en) * | 2022-07-29 | 2024-02-01 | 华为数字能源技术有限公司 | Photovoltaic power supply system and control method therefor |
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