CN201515334U - Solar photovoltaic generating system for power supply transformer substation - Google Patents

Solar photovoltaic generating system for power supply transformer substation Download PDF

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Publication number
CN201515334U
CN201515334U CN2009202390567U CN200920239056U CN201515334U CN 201515334 U CN201515334 U CN 201515334U CN 2009202390567 U CN2009202390567 U CN 2009202390567U CN 200920239056 U CN200920239056 U CN 200920239056U CN 201515334 U CN201515334 U CN 201515334U
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CN
China
Prior art keywords
photovoltaic
dc
solar
power
system
Prior art date
Application number
CN2009202390567U
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Chinese (zh)
Inventor
张冲
田晓磊
李国伟
陈浚
王振河
李贵民
张松
张萍
白万建
孔庆
彭红霞
张卫国
Original Assignee
山东昂立天晟光伏科技有限公司
山东电力集团公司枣庄供电公司
山东电力集团公司菏泽供电公司
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Priority to CN2009202390567U priority Critical patent/CN201515334U/en
Priority to CN200910019180A priority patent/CN101656422A/en
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Publication of CN201515334U publication Critical patent/CN201515334U/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
    • Y02BCLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
    • Y02B10/00Integration of renewable energy sources in buildings
    • Y02B10/70Hybrid systems
    • Y02B10/72Uninterruptible or back-up power supplies integrating renewable energies
    • 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
    • Y02E10/56Power conversion electric or electronic aspects
    • Y02E10/563Power conversion electric or electronic aspects for grid-connected applications

Abstract

The utility model relates to a solar photovoltaic generating system of a power supply transformer substation. DC voltage generated by a solar battery array is output to a DC distribution box and then is output to a control switching device. The control switching device has the functions of grid-connected electricity generation and DC charging and is respectively connected with a PV grid-connected inverter and a PV charging controller. The output end of the PV grid-connected inverter is connected with a transformer lower voltage end in a transformer substation in parallel and sends electric energy into a mains power system. The PV charging controller is connected with a storage battery which is connected with a DC system in the transformer substation. When an AC power system in the transformer substation looses power, the storage battery supplies power for the DC system. The utility model has the functions of grid-connected electricity generation and DC charging. In the normal situation, the system runs in a grid-connected manner and when the AC in the transformer substation looses power, the system can be used as a DC charger. The utility model can strengthen the power supply reliability of the DC system in the substation, reduce the power system power consumption of load in the transformer substation and even realize the zero consumption of the transformer substation.

Description

A kind of solar photovoltaic power generating system applied to power supply substation

Technical field

The utility model relates to a kind of solar photovoltaic generation system that is incorporated into the power networks, and especially a kind of applied to power supply substation is with having DC charging and the solar photovoltaic generation system of the function of generating electricity by way of merging two or more grid systems.

Background technology

Photovoltaic generating system will become electric energy from the energy conversion of the sun by solar cell, and these electric energy can be sent into electrical network or be stored in storage battery, thereby provide the nexhaustible energy for the mankind.In addition, solar energy also have safe and reliable, need not consume fuel, easy to maintenance, scale arbitrarily, can be in incomparable advantages of conventional energy resource such as building combine.

The parallel network power generation technology is the new technology of rising recent years, compares with traditional kerosene, oily electricity to have environmental protection, energy free consumption, plurality of advantages such as can reuse, and be the emphasis of realizing the development of energy strategy from now on.Now external solar photovoltaic technology and scale operation are ripe, and the U.S., Japan, Germany have all set up the MW class photovoltaic plant, and its building photovoltaic generation integrated (BIPV) comprises that the solar energy rooftop photovoltaic systems is all quite universal.And Chinese photovoltaic generation industry is in the seventies in 20th century starting, and the mid-90 enters stable development period, and solar cell and module production increase year by year steadily now, and the photovoltaic generation industry obtains fast development.

Occur on the market at present many be grid-connected photovoltaic power generation system, or only have the photovoltaic system of independent generating, the former just can not be incorporated into the power networks with electrical network when grid power blackout, generating electricity, it is bigger limited by electrical network; The latter is when rainy weather occurring for a long time, just can not in time export electric energy, also might damage the storage battery in the energy storage device under the serious situation.

Summary of the invention

The purpose of this utility model provides a kind of applied to power supply substation solar energy photovoltaic system with the DC charging and the function of generating electricity by way of merging two or more grid systems, system is just often with also net mode operation, system can be used as the dc charging motor use when electric substation's alternating current dead electricity, realize DC charging and the integration of generating electricity by way of merging two or more grid systems, make DC generation and generate electricity by way of merging two or more grid systems automatic switchover, perhaps by manual switchover.

For achieving the above object, the technical solution adopted in the utility model is:

A kind of solar photovoltaic power generating system applied to power supply substation, comprise: solar cell array, solar battery array comprises solar module, terminal box and support, solar module connects by electric connecting mode, solar energy is directly changed into electric energy, and the direct voltage that solar battery array produces exported by terminal box, it is characterized in that: the direct voltage that solar battery array produces is exported to the DC distribution case by terminal box; The DC distribution case receives the direct voltage that solar battery array produces, and becomes constant DC to press through isolated variable and exports to control switch device, and the control switch device setting is generated electricity by way of merging two or more grid systems and the switching of two kinds of functions of DC charging; Control switch device is connected with photovoltaic charge controller with photovoltaic combining inverter respectively; The output of photovoltaic combining inverter is in parallel with the step-down side in the electric substation by power distribution cabinet, and electric energy is sent into utility grid by transformer; Photovoltaic charge controller is connected with storage battery, and the control solar cell charges a battery, simultaneously overcharging, crossing and put the row protection into storage battery; Storage battery is connected with direct current system in the electric substation, and accumulators store solar photovoltaic electric energy under the situation of the AC network dead electricity of electric substation, is the power supply of the direct current system in the electric substation.

According to described solar photovoltaic power generating system applied to power supply substation, it is characterized in that: this system also comprises independently detection system, this independently detection system be used for detecting the power station operation conditions that is incorporated into the power networks, comprise the operational factor and the monitoring of environmental parameter that detect the power station, this detection system is utilized the Engineering Control computer data acquisition, show various operating states and operational factor, and finish the communication of various data.

According to described solar photovoltaic power generating system applied to power supply substation, it is characterized in that: described control switch device comprises: manually carry out independently generating electricity by way of merging two or more grid systems, manually carry out DC charging, generate electricity by way of merging two or more grid systems automatically/three kinds of switching states of DC charging; Under the normal condition, control switch device be in automatically generate electricity by way of merging two or more grid systems/the DC charging switching state under; (1) manually carry out DC charging: the DC charging switch closes a floodgate, and other switches disconnect, and only photovoltaic charge controller work can charge a battery; (2) manually carry out independently generating electricity by way of merging two or more grid systems: the switch that generates electricity by way of merging two or more grid systems closes a floodgate, and other switches disconnect, and only photovoltaic combining inverter work is generated electricity by way of merging two or more grid systems; (3) generate electricity by way of merging two or more grid systems automatically/DC charging: automatic transfer switch closes a floodgate, and other switches disconnect, sample port input 220VAC, electric main just often, photovoltaic combining inverter work is generated electricity by way of merging two or more grid systems; During the electric main dead electricity, after the time-delay, photovoltaic combining inverter quits work, and photovoltaic charge controller is started working, and charges a battery.

The utility model applied to power supply substation photovoltaic generating system, has DC charging and the function of generating electricity by way of merging two or more grid systems, the direct current energy that solar battery array produces can convert alternating current to through photovoltaic combining inverter on the one hand, the output of inverter is in parallel with the step-down side (220V/380V) in the electric substation by power distribution cabinet, the electric energy that sends is sent into electrical network by transformer directly to be used for the user, increase the photovoltaic plant utilance, the function that allows photovoltaic plant have to generate electricity by way of merging two or more grid systems, can be charge in batteries exchanging under the situation of dead electricity on the other hand by photovoltaic charge controller, and then can be the direct current system power supply of electric substation inside, increased the reliability of transforming station direct current system.

The utility model solar photovoltaic power generating system applied to power supply substation has DC charging and the function of generating electricity by way of merging two or more grid systems, and with also net mode operation, under the situation of electric substation's alternating current dead electricity, system can be used as dc charging motor and uses under system's normal condition.This has just realized DC charging and the integration of generating electricity by way of merging two or more grid systems, and makes DC generation and generates electricity by way of merging two or more grid systems automatic switchover, also can be by manual switchover.

Description of drawings

Fig. 1 is the utility model solar photovoltaic generation system schematic diagram.

Fig. 2 is a control switch device schematic diagram in the utility model.

Fig. 3 is a control switch device winding diagram in the utility model.

Fig. 4 is the main circuit diagram of photovoltaic combining inverter SG5K-C in the utility model.

Embodiment

The utility model is described in further detail below in conjunction with the drawings and specific embodiments:

The utility model solar photovoltaic power generating system applied to power supply substation is to utilize solar battery array that solar energy converting is become direct current, and the dc inverter that solar energy is sent by the AC/DC photovoltaic combining inverter becomes 50 hertz, the alternating current of 220V/380V again.The output of photovoltaic combining inverter is in parallel with the step-down side (220V/380V) in the electric substation by power distribution cabinet, and the electric energy that sends is sent into electrical network by transformer.

The photovoltaic stand alone generating system is to utilize solar battery array to be listed in output electric energy under the solar light irradiation, powers to battery charging and to DC load through DC distribution device and photovoltaic charge controller.Can not satisfy when powering to the load in continuous overcast and rainy photovoltaic cell capable of generating power amount, can continue to power to the load by photovoltaic charge controller by storage battery.

The utility model photovoltaic generating system mainly comprises solar cell array, the DC distribution case, and control switch device, photovoltaic charge controller, storage battery, detection system etc. independently, wherein:

Solar battery array is made up of by certain electric connecting mode photovoltaic cell component, solar energy is directly changed into electric energy, pass through maximum power point, make photovoltaic cell be in the maximum power output state, and the direct voltage that solar battery array produces is directly exported to the DC distribution case;

The DC distribution case receives the direct voltage that solar battery array produces, and becomes constant DC to press through isolated variable and exports to control switch device;

Control switch device is mainly finished and is generated electricity by way of merging two or more grid systems and the switching of two kinds of functions of DC charging; This control switch device, but manual switchover also can be automaticallyed switch.Wherein, manual switchover can be generated electricity by way of merging two or more grid systems separately or be carried out DC charging separately; Under the automatic switchover state, this system moves in the mode of generating electricity by way of merging two or more grid systems, if the situation of dead electricity occurs exchanging, for increasing the reliability of direct current system, photovoltaic plant is the direct current system charging of electric substation as standby dc charging motor.Automatic switching function in this system is that whether dead electricity is carried out automatic switchover by detecting alternating current.

Photovoltaic charge controller is connected in energy storage device, can control that solar cell charges a battery, controller overcharging, crossing and put the row protection into storage battery simultaneously.

Storage battery is an energy storage device, is used to store the solar photovoltaic electric energy, and to provide under the situation of electric energy by storage battery be the transforming station direct current system power supply to direct current system in the AC network dead electricity can not be for electric substation, guarantees the reliability of direct current system.

Independently detection system is that independently detection system is to be used for detecting the power station operation conditions that is incorporated into the power networks, and comprises the operational factor (CER of voltage, electric current, power, frequency, energy output, carbon dioxide etc.) and the monitoring of environmental parameter (sunshine, wind speed, wind direction, ambient temperature) that detect the power station.This detection system is utilized industrial computer (Engineering Control computer) image data, utilizes 37 ' large-screen liquid crystal display television to show various operating states and operational factor, and finishes the communication of various data.

Specific embodiment:

The utility model can influence the life-span of storage battery at continuous for a long time to accumulator cell charging and discharging, and only uses the defective that can waste solar energy resources as DC charging.The utility model adopts under the mode of being incorporated into the power networks, if the situation of AC network dead electricity occurs, can automatically switch to the DC charging operational mode; And the manual switchover in the control switch device can realize independently generating electricity by way of merging two or more grid systems or the independent direct current charging.

The utility model is taken into account the combining inverter condition of work according to the requirement of transforming station direct current system charge in batteries, in conjunction with the weather information of infield, has determined the concrete configuration of photovoltaic module.What the utility model adopted is the single crystal silicon solar cell assembly of ATM-175, employing be 9 strings 3 and the photovoltaic module square formations, square formation needs 27 block assemblies altogether.

The utility model is according to the transmission of electricity requirement of applied to power supply substation, determined the main parameter of solar module, photovoltaic charge controller, DC-AC contravariant equipment (combining inverter), photovoltaic plant detection system, particularly when selecting combining inverter, make the aberration rate of total current satisfy the requirement of supply station, also Theoretical Calculation and actual power quantitative analysis have been carried out in solar energy power generating at last.

The utility model comprises solar cell array as shown in Figure 1, DC distribution case, control switch device, photovoltaic combining inverter, photovoltaic charge controller, storage battery, independently detection system.

Solar battery array is made up of solar module, terminal box and support.Form by certain electric connecting mode by solar module, solar energy is directly changed into electric energy, and the direct voltage that solar battery array produces is exported to the DC distribution case by terminal box.

The DC distribution case receives the direct voltage that solar battery array produces, and becomes constant DC to press through isolated variable and exports to control switch device;

Control switch device is core of the present utility model, and this part mainly contains manually carries out independently generating electricity by way of merging two or more grid systems, manually carries out DC charging, generates electricity by way of merging two or more grid systems automatically/DC charging.

Can manually carry out independently generating electricity by way of merging two or more grid systems or the independent direct current charging according to concrete needs.As shown in Figure 2, command switch has three kinds of states, " direct current " " be incorporated into the power networks " " automatically ".Under the normal condition, this system is under the automatic switchover state.

(1) the DC charging switch closes a floodgate (other switches disconnect): only photovoltaic charge controller work can charge a battery.

(2) switch that generates electricity by way of merging two or more grid systems closes a floodgate (other switches disconnect): only photovoltaic combining inverter work, generate electricity by way of merging two or more grid systems.

(3) automatic transfer switch closes a floodgate (other switches disconnect): sample port input 220VAC, electric main just often, photovoltaic combining inverter work is generated electricity by way of merging two or more grid systems.During the electric main dead electricity, after the time-delay, photovoltaic combining inverter quits work, and photovoltaic charge controller is started working, and charges a battery.

Independently detection system is to be used for detecting the power station operation conditions that is incorporated into the power networks, and comprises the operational factor (CER of voltage, electric current, power, frequency, energy output, carbon dioxide etc.) and the monitoring of environmental parameter (sunshine, wind speed, wind direction, ambient temperature) that detect the power station.This detection system is utilized industrial computer (Engineering Control computer) image data, utilizes 37 ' large-screen liquid crystal display television to show various operating states and operational factor, and finishes the communication of various data.

Producer, model and the partial parameters of following attached each several part device.

(1) solar module

Producer: Onlly sky, Shandong bright photovoltaic Science and Technology Ltd.

Model: ATM-175

Its major parameter is as follows:

Battery material: monocrystalline silicon;

Battery is formed: arranged with orderly form by 72 monocrystalline silicon batteries, be in series

Encapsulating structure: glass/battery/metal framework;

Satisfy the IEC1215 standard;

Nominal power: 180W;

Open circuit voltage: 44.4V;

Short circuit current: 5.3A;

Quantity: 27;

Operating ambient temperature :-40 ℃~+ 70 ℃;

Solar cell gross power: 4860W;

Solar battery array working life: 〉=25 years;

(2) photovoltaic charge controller

Producer: Hefei Sunlight Power Supply Co., Ltd.

Model: SD22050

Its important technological parameters is as follows:

Environmental requirement: working temperature-20 ℃~40 ℃;

Storage temperature-20 ℃~50 ℃;

Relative humidity is below 95%;

The type of cooling is natural air cooled;

1min during dielectric strength DC500V;

Insulation impedance is greater than 10M Ω;

The system earth minus earth.

Measurement parameter: solar cell array input voltage, each road input current of solar cell array, storage battery average anode current, battery tension.

Indication: overcharge, cross and put the protection indication.

Report to the police: cross when putting and report to the police.

Power/current Control Parameter: the maximum input power 11000W that allows; The maximum input current 50A that allows; Maximum output current 50A.

(3) photovoltaic combining inverter (DC-AC contravariant equipment)

Producer: Hefei Sunlight Power Supply Co., Ltd.

Model: SG5K-C

The part running parameter is as follows:

The direct current best power is followed the tracks of (MPPT) input voltage range: DC200V~DC450V;

Maximum array open circuit voltage: DC450V;

Direct voltage ripple: Vpp≤10%;

Maximum direct current input current: DC30A;

Maximum conversion efficiency: 95% (European efficient 93%);

Maximum power output: the 5KW that exchanges;

Allow mains frequency scope: 49.8~50.2Hz;

Total current waveform aberration rate: THD≤3%;

Power factor (PF): 〉=0.98;

Defencive function: protection to error-polarity connection, short-circuit protection, island effect protection, overtemperature protection, overload protection, ground protection;

System communication

Communication interface: RS485 or CAN bus;

Power network monitoring: according to the UL1741 standard.

(4) industrial computer

Producer: Advantech limited company

Model: ARK-3389

The part running parameter is as follows:

CPU:Intel Pentium M low voltage processors;

Installed System Memory: one 200 pin SO-DIMM slot; Support is up to the DDR SDRAM of 1GB;

Show: the dynamic video ram of the highest 64MB; The CRT interface;

Ethernet controller: 10/100MBps;

WatchDog Timer and serial port;

Input voltage: DC12V~DC24V;

Working temperature :-20 ℃~60 ℃.

Embodiment recited above is described preferred implementation of the present utility model; be not that design of the present utility model and protection range are limited; under the prerequisite that does not break away from the utility model design concept; common engineers and technicians make the technical solution of the utility model in this area various modification and improvement all should fall into protection range of the present utility model.

Claims (3)

1. solar photovoltaic power generating system applied to power supply substation, comprise: solar cell array, solar battery array comprises solar module, terminal box and support, solar module connects by electric connecting mode, solar energy is directly changed into electric energy, and the direct voltage that solar battery array produces exported by terminal box, it is characterized in that: the direct voltage that solar battery array produces is exported to the DC distribution case by terminal box; The DC distribution case receives the direct voltage that solar battery array produces, and becomes constant DC to press through isolated variable and exports to control switch device, and the control switch device setting is generated electricity by way of merging two or more grid systems and the switching of two kinds of functions of DC charging; Control switch device is connected with photovoltaic charge controller with photovoltaic combining inverter respectively; The output of photovoltaic combining inverter is in parallel with the step-down side in the electric substation by power distribution cabinet, and electric energy is sent into utility grid by transformer; Photovoltaic charge controller is connected with storage battery, and the control solar cell charges a battery, simultaneously overcharging, crossing and put the row protection into storage battery; Storage battery is connected with direct current system in the electric substation, and accumulators store solar photovoltaic electric energy under the situation of the AC network dead electricity of electric substation, is the power supply of the direct current system in the electric substation.
2. solar photovoltaic power generating system applied to power supply substation according to claim 1, it is characterized in that: this system also comprises independently detection system, this independently detection system be used for detecting the power station operation conditions that is incorporated into the power networks, comprise the operational factor and the monitoring of environmental parameter that detect the power station, this detection system is utilized the Engineering Control computer data acquisition, show various operating states and operational factor, and finish the communication of various data.
3. solar photovoltaic power generating system applied to power supply substation according to claim 1 and 2 is characterized in that: described control switch device comprises: manually carry out independently generating electricity by way of merging two or more grid systems, manually carry out DC charging, generate electricity by way of merging two or more grid systems automatically/three kinds of switching states of DC charging; Under the normal condition, control switch device be in automatically generate electricity by way of merging two or more grid systems/the DC charging switching state under; (1) manually carry out DC charging: the DC charging switch closes a floodgate, and other switches disconnect, and only photovoltaic charge controller work can charge a battery; (2) manually carry out independently generating electricity by way of merging two or more grid systems: the switch that generates electricity by way of merging two or more grid systems closes a floodgate, and other switches disconnect, and only photovoltaic combining inverter work is generated electricity by way of merging two or more grid systems; (3) generate electricity by way of merging two or more grid systems automatically/DC charging: automatic transfer switch closes a floodgate, and other switches disconnect, sample port input 220VAC, electric main just often, photovoltaic combining inverter work is generated electricity by way of merging two or more grid systems; During the electric main dead electricity, after the time-delay, photovoltaic combining inverter quits work, and photovoltaic charge controller is started working, and charges a battery.
CN2009202390567U 2009-09-25 2009-09-25 Solar photovoltaic generating system for power supply transformer substation CN201515334U (en)

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CN2009202390567U CN201515334U (en) 2009-09-25 2009-09-25 Solar photovoltaic generating system for power supply transformer substation
CN200910019180A CN101656422A (en) 2009-09-25 2009-09-25 Solar photovoltaic power generating system applied to power supply substation

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CN2009202390567U CN201515334U (en) 2009-09-25 2009-09-25 Solar photovoltaic generating system for power supply transformer substation
CN200910019180A CN101656422A (en) 2009-09-25 2009-09-25 Solar photovoltaic power generating system applied to power supply substation

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CN102175944A (en) * 2011-02-24 2011-09-07 复旦大学 Photovoltaic grid-connected inverter test bench
CN103675524A (en) * 2013-11-14 2014-03-26 国家电网公司 Photovoltaic power generation system model parameter identification test method
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