CN201789441U - Preinstalled type photovoltaic substation box - Google Patents

Preinstalled type photovoltaic substation box Download PDF

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Publication number
CN201789441U
CN201789441U CN2010202531267U CN201020253126U CN201789441U CN 201789441 U CN201789441 U CN 201789441U CN 2010202531267 U CN2010202531267 U CN 2010202531267U CN 201020253126 U CN201020253126 U CN 201020253126U CN 201789441 U CN201789441 U CN 201789441U
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CN
China
Prior art keywords
photovoltaic
inverter
positive
power transformation
copper bar
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Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Fee Related
Application number
CN2010202531267U
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Chinese (zh)
Inventor
薛黎明
段凤明
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Rayspower Energy Group Co Ltd
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Rayspower New Energy Co Ltd
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Priority to CN2010202531267U priority Critical patent/CN201789441U/en
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    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02ATECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
    • Y02A30/00Adapting or protecting infrastructure or their operation
    • Y02A30/14Extreme weather resilient electric power supply systems, e.g. strengthening power lines or underground power cables
    • YGENERAL 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
    • Y02TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02EREDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E10/00Energy generation through renewable energy sources
    • Y02E10/50Photovoltaic [PV] energy

Abstract

The utility model relates to a preinstalled type photovoltaic substation box, the input end of the substation box is connected with a solar energy component, and the output end of the substation box is connected with a step-up transformer connected grid or is directly connected with a load user; and the preinstalled type photovoltaic substation box consists of a confluence unit, a direct current control unit and a photovoltaic power generation connected grid inverter which are sequentially connected in series. The preinstalled type photovoltaic substation box organically combines the three units, different type series adapt to photovoltaic power stations with different scales, the photovoltaic power stations from 100kW to 10000kW can be directly used, the output power voltage is stable, the three-phase current is balanced, harmonic is small, and the substation box fully meets the nationally regulated power quality standard.

Description

Prepackage type photovoltaic power transformation case
Technical field
The utility model relates to the photovoltaic distribution box, particularly prepackage type photovoltaic power transformation case.
Background technology
Just in thriving rise, along with the improvement of photoelectric material and the raising of generating efficiency, replace thermoelectricity is a kind of inexorable trend to solar power generation as a kind of new energy.But, unit, DC control unit and three parts of photovoltaic power generation grid-connecting inverter of confluxing in the existing device of solar generating are separate, in assembling process, be connected respectively in total circuit of solar power system, if three parts are respectively by different manufacturers production, it is not corresponding to occur interface in assembling process sometimes, problems such as model does not match, can cause obstruction to the construction of whole solar power system, and because not matching and must the work of whole solar power system be impacted between the three.
The utility model content
At existing problem in the prior art, the utility model provides a kind of prepackage type header box, this prepackage header box unit that will conflux, DC control unit and photovoltaic power generation grid-connecting inverter three parts are being integrated together, do as a whole use or sale, and according to the different model of different demands customization of each electrical network, avoided because three's model does not match, or interface does not each other match and the influence to solar power system that causes, this product is realized traditional header box, DC distribution case and inverter cabinet are encapsulated into together, have realized photovoltaic plant modularization and standardization.And make installation process become very convenient quick.
Prepackage type photovoltaic power transformation case is made up of the unit that confluxes, DC control unit and photovoltaic power generation grid-connecting inverter three parts, and the three is cascaded successively, its input termination solar components, and output termination step-up transformer is incorporated into the power networks or directly connects the load user.
Further, be parallel with lightning protection device in the circuit between described DC control unit and the described photovoltaic power generation grid-connecting inverter.
Further, the described unit that confluxes is made of conflux lead-out terminal and auxiliary protection device of direct-flow positive pole fuse holder and fuse, confluence copper bar, dc circuit breaker, direct current negative pole fuse holder and fuse, input terminal row, direct current; The electric current both positive and negative polarity that photovoltaic module sends is at first respectively through input terminal row both positive and negative polarity, process direct-flow positive pole fuse holder and fuse and direct current negative pole fuse holder and fuse are connected to confluence copper bar input both positive and negative polarity respectively then, be connected respectively to the input both positive and negative polarity of dc circuit breaker again, export by the direct current lead-out terminal that confluxes at last.
Further, described auxiliary protection device comprises earth terminal, water joint, lightning protection device and communication/current detecting plate.
Further, described DC control unit comprises counnter attack diode, anodal dc bus copper bar, negative pole dc bus copper bar, voltmeter, lightning arrester and earthing device; Header box circuit breaker lead-out terminal positive pole connects the counnter attack diode of DC distribution case, connect anodal dc bus copper bar then, header box circuit breaker lead-out terminal negative pole is directly received the negative pole dc bus copper bar of DC distribution case, dc bus copper bar both positive and negative polarity connect respectively voltmeter both positive and negative polarity, connect and connect the input terminal photovoltaic power generation grid-connecting inverter that the sub-DC+ of dc output end and DC-enter combining inverter behind the lightning arrester.
Further, described photovoltaic power generation grid-connecting inverter is made up of voltage source inverter, control protected location, man-machine interface; Described control protected location is connected with described voltage source inverter, and described man-machine interface is connected in series with the control protected location.
Further, described voltage source inverter is by the filter that is serially connected, and three-phase voltage source type inverter and EMC filter constitute; DC power supply by the output of DC control unit at first enters described three-phase voltage source type inverter through described EMC filter, and three-phase voltage source type inverter converts direct current to alternating current and outputs to electrical network through filter.
Further, described man-machine interface comprises touch-screen and background process device; Described touch-screen, described control protected location and described background process device are connected in series successively.
Further, described control protected location and described voltage source inverter communication acquisition energy data.
To conflux prepackage type photovoltaic power transformation case unit, DC control unit and three unit organic assembling of photovoltaic power generation grid-connecting inverter arrive together.The specification that each assembly can be set according to the actual requirements is to adapt to the photovoltaic plant of different scales, can realize directly to adopt to the 10000KW photovoltaic plant from 100KW, the electric energy voltage of output is stable, three-phase balance, harmonic wave are little, satisfies the quality of power supply standard of national regulation fully.
Description of drawings
Fig. 1 is that prepackage type photovoltaic power transformation case circuit connects total figure;
Fig. 2 is the element circuit figure that confluxes;
Fig. 3 is the photovoltaic power generation grid-connecting inverter circuit diagram.
Embodiment
As shown in Figure 1, the input termination solar photovoltaic assembly of prepackage type photovoltaic power transformation case, its output termination step-up transformer is incorporated into the power networks or directly connects the load user.Mainly be made up of the unit 1 that confluxes, DC control unit 2 and photovoltaic power generation grid-connecting inverter 3 three parts, the three is cascaded successively, and is parallel with lightning protection device 4 in the circuit between DC control unit 2 and photovoltaic power generation grid-connecting inverter 3.
The unit confluxes:
The unit 1 that confluxes can be composed in series a photovoltaic tandem by the photovoltaic module that some specifications is identical, again several photovoltaic tandems are inserted the unit that confluxes side by side, by having the Direct Current Distribution Unit output of lightning protection device and circuit breaker, made things convenient for the access of follow-up inverter unit at last.
As shown in Figure 2, conflux the unit mainly by direct-flow positive pole fuse holder and fuse (the PV fuse shown in the figure) 11, earth terminal 12, water joint (not shown), communication/current detecting plate 13, confluence copper bar (not shown), dc circuit breaker 14, lightning protection device 15, direct current negative pole fuse holder and fuse 16, input terminal row's (not shown) and the direct current formations such as lead-out terminal 17 of confluxing.The electric current both positive and negative polarity that photovoltaic module sends is at first respectively through input terminal row both positive and negative polarity, pass through direct-flow positive pole fuse holder and fuse and direct current negative pole fuse holder and fuse (PV fuse) 11,16 then respectively and be connected to confluence copper bar input both positive and negative polarity, be connected respectively to the input both positive and negative polarity of dc circuit breaker 14 again, export by the direct current lead-out terminal 7 that confluxes at last.
Also be provided with the auxiliary protection device in the header box: this auxiliary protection device is made up of earth terminal 12, water joint, lightning protection device 15 and communication/current detecting plate 13.Wherein lightning protection device 15 is a photovoltaic special high-pressure lightning protection device, and its anodal negative pole all possesses lightning protection function.Short-circuit protection: short-circuit protection is used to detect the short trouble on the dc bus, or the lightning protection device short circuit: when voltage during less than set point, carry out total current and judge, when total current surpasses set point, open the protection action.The current imbalance protection: it is unusual that the current imbalance protection is used for test set crosstalk stream; when the degree of unbalance of a certain road group crosstalk stream surpasses set point, and has 1 road electric current at least when not having stream latching current threshold, through setting time-delay; the protection action, every road electric current all has independently fault flag.The computational methods of current imbalance degree are as follows:
N road degree of unbalance=| n road electric current-effective crossfire current average | * 100%/effective crossfire current average.
Open-phase protection: open-phase protection is used to detect fuse open circuit or other open-phase faults.When bus voltage during greater than certain value, carry out the judgement of electric current, if the electric current of a certain road correspondence is 0, then protection action, every road electric current all has independently fault flag.Current deviation 3 segment protects: current deviation 3 segment protects be used for to the voltage segmentation carry out current deviation detection.Every segment protect can be set corresponding voltage section, when bus voltage drops on this section, each group crosstalk stream is detected; set lower limit or be higher than capping if electric current is lower than; illustrate that current deviation is unusual, the protection action, every road electric current all has independently fault flag.Overvoltage protection: when the lightning protection device open failure, if magnitude of voltage increases, voltage can not be clamped at setting voltage and can soar to a higher value; Overvoltage protection promptly is the protection of judging the lightning protection device open circuit.
Header box also includes current monitoring and communication function, communication terminal 18 RS485 interfaces connect center host, main frame is equipped with the software that information shows, information uploadings such as the voltage that header box is passed through by communication terminal 18 RS485 interfaces, electric current, temperature show to the monitoring central server main frame, realize measuring by analysis software showing.When fault such as overvoltage, short circuit took place, also just when voltage or electric current during greater than a certain numerical value, voltage or current relay action were exported by 6 relays equally and communication terminal 18 RS485 interfaces upload to main frame.
The DC control unit:
As shown in Figure 1: DC control unit key wiring diagram, the DC control unit is made up of counnter attack diode 21, anodal dc bus copper bar 22, negative pole dc bus copper bar 23, voltmeter 24, earthing device 25 etc., realizes the collection and the control of the electric current that the photovoltaic tandem produces.Its annexation is: header box circuit breaker lead-out terminal positive pole connects the counnter attack diode 21 of DC distribution case, connect anodal dc bus copper bar 22 then, header box circuit breaker lead-out terminal negative pole is directly received the negative pole dc bus copper bar 23 of DC distribution case, dc bus copper bar both positive and negative polarity 22 and 23 connect respectively voltmeter 24 both positive and negative polarity, connect and be connected the sub-DC+ of dc output end behind the lightning protection device 4 and DC-enters photovoltaic power generation grid-connecting inverter 3.
The photovoltaic power generation grid-connecting inverter:
Mainly form by voltage source inverter, control protected location, man-machine interface etc.Man-machine interface comprises touch-screen and background process device; The control protected location is connected with inverter, gathers energy data, and touch-screen and background process device are connected in series with the control protected location.Acting as of voltage source inverter: the direct current that photovoltaic array is sent converts to exchange and is transported to electrical network; The control protected location of inverter is the core component of photovoltaic power generation grid-connecting inverter, low-and high-frequency filter and compensation arrangement have been comprised, it mainly acts on is the main loop of power circuit action sequence of control, in real time system is owed/protections such as overvoltage, offset frequency, short circuit and anti-isolated island; Man-machine interface is mainly used in system's important parameter setting and information shows.
Fig. 3 is a photovoltaic power generation grid-connecting converter main circuit structure chart, is made of three-phase voltage source type inverter 31, EMC filter 33 and output filter 32.The DC power supply of DC control unit output at first enters inverter through EMC filter 33, and inverter converts direct current to alternating current and outputs to electrical network through filter 32.Energy data is gathered in control protected location 34 and inverter communication among Fig. 3, and by touch-screen 35: this touch-screen comprises LED display part in the unit that confluxes; Send result to backstage 36: store in the monitoring central server main frame in the unit that promptly confluxes.
Inverter in the utility model has five kinds of mode of operations such as MPPT maximum power point tracking, permanent power, constant voltage, constant current and reactive power adjusting, and the user can select as required.
1) MPPT maximum power point tracking
Under this pattern, inverter generates electricity by way of merging two or more grid systems with maximum power.
2) permanent power
Under the permanent power mode, inverter can generate electricity by way of merging two or more grid systems with constant power according to the dispatch command of electric power system, and performance number size on-line continuous is adjustable.
3) constant voltage
Under the constant voltage mode, the inverter DC bus-bar voltage is a fixed value.To the array of monocrystalline silicon, polycrystalline silicon material, its value is generally 0.8 times of open circuit voltage; To the array of thin-film material, its value is 0.7 times of open circuit voltage.
4) constant current
Under the constant current mode, inverter generates electricity by way of merging two or more grid systems with constant current, and this current value size on-line continuous is adjustable.
5) reactive power is regulated
Under the reactive power adjusting pattern, inverter is the output reactive power when output is meritorious, as required power factor is carried out on-line continuous and regulates.Should guarantee under this pattern that total apparent capacity is no more than the inverter rated capacity.
Prepackage type photovoltaic power transformation case arrives three unit organic assembling together, different ranges of models adapts to the photovoltaic plant of different scales, can directly adopt to the 10000KW photovoltaic plant from 100KW, the electric energy voltage of output is stable, three-phase balance, harmonic wave are little, satisfies the quality of power supply standard of national regulation fully.Disclosed prepackage type photovoltaic power transformation case is applicable to desert power supply difficult problem in the utility model in addition, and the wide-voltage switch power supply can be removed the externally fed power supply from directly from the dc bus power taking.

Claims (9)

1. prepackage type photovoltaic power transformation case, its input termination solar components, output termination step-up transformer is incorporated into the power networks or directly connects the load user; It is characterized by: described prepackage type photovoltaic power transformation case is made up of the unit that confluxes that is cascaded successively, DC control unit and photovoltaic power generation grid-connecting inverter three parts.
2. according to the photovoltaic of prepackage type described in the claim 1 power transformation case, it is characterized by: described DC control unit and described inverter are incorporated into the power networks and are parallel with lightning protection device in the circuit between single source.
3. according to the photovoltaic of prepackage type described in the claim 1 power transformation case, it is characterized by: the described unit that confluxes is arranged by direct-flow positive pole fuse holder and fuse, confluence copper bar, dc circuit breaker, direct current negative pole fuse holder and fuse, input terminal and direct current confluxes, and lead-out terminal and auxiliary protection device constitute; The electric current both positive and negative polarity that photovoltaic module sends is at first respectively through input terminal row both positive and negative polarity, process direct-flow positive pole fuse holder and fuse and direct current negative pole fuse holder and fuse are connected to confluence copper bar input both positive and negative polarity respectively then, be connected respectively to the input both positive and negative polarity of dc circuit breaker again, export by the direct current lead-out terminal that confluxes at last.
4. according to the photovoltaic of prepackage type described in the claim 3 power transformation case, it is characterized by: described auxiliary protection device comprises earth terminal, water joint, lightning protection device and communication/current detecting plate.
5. according to the photovoltaic of prepackage type described in the claim 1 power transformation case, it is characterized by: described DC control unit comprises counnter attack diode, anodal dc bus copper bar, negative pole dc bus copper bar, voltmeter, lightning arrester, earthing device; Header box circuit breaker lead-out terminal positive pole connects the counnter attack diode of DC distribution case, connect anodal dc bus copper bar then, header box circuit breaker lead-out terminal negative pole is directly received the negative pole dc bus copper bar of DC distribution case, dc bus copper bar both positive and negative polarity connect respectively voltmeter both positive and negative polarity, connect and connect the input terminal photovoltaic power generation grid-connecting inverter that the sub-DC+ of dc output end and DC-enter combining inverter behind the lightning arrester.
6. according to the photovoltaic of prepackage type described in the claim 1 power transformation case, it is characterized by: described photovoltaic power generation grid-connecting inverter is made up of voltage source inverter, control protected location, man-machine interface; Described control protected location is connected with described voltage source inverter, and described man-machine interface is connected in series with the control protected location.
7. according to the photovoltaic of prepackage type described in the claim 6 power transformation case, it is characterized by: described voltage source inverter is by the filter that is serially connected, and three-phase voltage source type inverter and EMC filter constitute; DC power supply by the output of DC control unit at first enters described three-phase voltage source type inverter through described EMC filter, and three-phase voltage source type inverter converts direct current to alternating current and outputs to electrical network through filter.
8. according to the photovoltaic of prepackage type described in the claim 6 power transformation case, it is characterized by: described man-machine interface comprises touch-screen and background process device; Described touch-screen, described control protected location and described background process device are connected in series successively.
9. according to the photovoltaic of prepackage type described in the claim 7 power transformation case, it is characterized by: communication acquisition energy data between described control protected location and the described voltage source inverter.
CN2010202531267U 2010-07-09 2010-07-09 Preinstalled type photovoltaic substation box Expired - Fee Related CN201789441U (en)

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Application Number Priority Date Filing Date Title
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Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102611356A (en) * 2012-03-20 2012-07-25 浙江旭辉光电科技股份有限公司 Solar grid-connected electricity generation system for sewage treatment
CN102611355A (en) * 2012-03-13 2012-07-25 特变电工新疆新能源股份有限公司 Photovoltaic array combiner box
CN103368426A (en) * 2013-08-02 2013-10-23 北京中电安博机电技术有限公司 Photovoltaic inverter with open-circuit voltage protection function
CN103457341A (en) * 2013-07-30 2013-12-18 安徽四创电子股份有限公司 Photovoltaic energy-saving controller of communication base station
CN107452826A (en) * 2017-07-26 2017-12-08 河北曹妃甸汉能薄膜太阳能有限公司 Hull cell terminal plate, sub- battery component and its assemble method

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN102611355A (en) * 2012-03-13 2012-07-25 特变电工新疆新能源股份有限公司 Photovoltaic array combiner box
CN102611356A (en) * 2012-03-20 2012-07-25 浙江旭辉光电科技股份有限公司 Solar grid-connected electricity generation system for sewage treatment
CN103457341A (en) * 2013-07-30 2013-12-18 安徽四创电子股份有限公司 Photovoltaic energy-saving controller of communication base station
CN103368426A (en) * 2013-08-02 2013-10-23 北京中电安博机电技术有限公司 Photovoltaic inverter with open-circuit voltage protection function
CN107452826A (en) * 2017-07-26 2017-12-08 河北曹妃甸汉能薄膜太阳能有限公司 Hull cell terminal plate, sub- battery component and its assemble method
CN107452826B (en) * 2017-07-26 2019-10-29 河北曹妃甸汉能薄膜太阳能有限公司 Hull cell terminal plate, sub- battery component and its assemble method

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