Srt Power Point Presentation 1

8/3/2019 Srt Power Point Presentation 1

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Solar Energy PowerGeneration:Introduction


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Clarification of the SolarEnergy Power GeneratingFollowing two type of the solar energy power generating

Grid-off solar energy power generatingMain used in the area where is no electricity supply or the

telecommunication station which is faraway from the electricity net

or the wireless places.

Key componentssolar panelbatteryintelligent controllerinverterelectricity distributionand anti-lighting system. (electricity distribution is close to theactive load).

Advantagesoffer the independent electricity net which will not restricted bythe local public electricity net.

Disadvantagesmuch waste of the energy resources or can controller theuse of the solar energy resources. the electricity use is high restricted by theweather condition, the low efficiency of use and high investment, a little low systemlife span (especially say the batters life span).


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Grid-On PV System

Main use in the place where the city electricity distribution net. It isthe lead direction of New energy from home and all over the world.

Key components:solar panelgrid-on inverter electricity distribution andanti-lighting systemmuch simple ).

Advantageshigh efficient use of the systemlong life spantheinvestment cost is some lowerthe use of the electricity will not restricted by thesystem itself and the weather conditioninfluence.

Disadvantagesthe return of the electricity powered by solar will berestricted by the local public electricity net.


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The Independent Grid-off Solar Energy PowerGenerating System Detailed Introduction


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Block diagram of the inverter


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the Maintainability of Photovoltaicpower systems components1 Some products photovoltaic power system components can be

repaired after used again, known as maintenance parts, butsome parts missing validity beyond repair or restoration costsare too high, these components as a non-repair components, thefollowing table lists the photovoltaic power supply

Attributes of components in the system.

Can be repaired non-repair

Inverter Solar panel

Controller Maintains free lead acid battery

PV water Pump DC lamps

Wind turbine Arrester, fuses, wires


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The designing of the PV Grid-OffsystemCase

Requirements: computers, lighting, radar (emotional) of load, timeuncertain, the daily power consumption about 200 KWH batteries topower for three days cloudy.

1. Battery configuration (in accordance with the allocation of work for three rainy days):

Battery groups voltage: 220 VCapacity needs:(daily needed electricity rainy days 1000) / (battery voltagedischarge capacity)

Discharge capacity:In the process of battery usage, the battery capacity released by the percentage of

its rated capacity, known as the discharge capacity. Discharge capacity to the protectionof small batteries, the election is generally recommended 0.5

(200 3 1000) / (220 * 0.5 * 0.9) = 5754 AHchoose 2 V1000AH battery of a total of five groups of 110pcs, a total of 550pcs.


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The designing of the PV Grid-Off system 2. Solar array configurations:

Need to configure the maximum power to maintain voltage in the vicinity of220V , Selection of 85 Wp (or other specifications): open-circuit voltage of 22V, maximum power point voltage of 17.5, short-circuit current of 545 A.

Configured 220/12 = 18pcs connected in series. Each series power is 18 85 = 1530Wp. Each series in accordance with the full power operation of 3.2hours, each providing 3.2 1530 = 4896 KWH electricity.

Need solar parallel: the daily consumption / (n = array electricity efficiency)

At: 200 / (4.9 * 0.85) = 48 Unit: 0.85 controller for solar and other conductors,such as the efficiency losses.

The total need to configure 48 18 = 864pcs 85 Wp solar panel


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The designing of the PV Grid-Off system

3. Solar controller configurationAccording to the trade unions and arrays: configuration 9pcs SD22100 solar

controller. Each four-way controller solar arrays.

4. Inverter configurationBecause users do not have to provide the power size of the load, in

accordance with the working day to 10 hours to estimate, about 30 KW.

Consider cushion and load activated impact of the proposedconfiguration SN22050KS power inverter.

Meanwhile, in order to protect key equipment, such as radar and worknormally. Recommends that users load individually configured as the key low-power inverter power, the inverter and battery SN22050KS common DC buspower, the specific size can be agreed with the users. The low-power invertercan be purchased as spared machine.


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Grid-connected PV systemRenewable energy grid-connected powergenerating applications


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the comparative advantages and disadvantages

of the structure and topology of the common

grid-connected inverter

direct inverter system

Low-frequencytransformer

isolation system


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the comparative advantages and disadvantages

of the structure and topology of the common

grid-connected inverter

the high-frequencyisolation system

Multi- More DC-DC(MPPT), single invertersystem

the high-frequencynon- isolation system


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The advantages and disadvantages ofdirect inverter system

Advantages:Eliminates cumbersome Frequency Transformer: high efficiency (96 %), light weight,simple structure.

Disadvantages:(1) solar panels and electrical power grids not isolation, solar panels have bipolarvoltage power grids, adverse safety.(2) DC type solar panels voltage is more than 350 V. This solar components, and

even the entire system of higher insulation requirements prone to leakagephenomenon.


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The advantages and disadvantages of the Lowefrequency Transformer isolation system

Advantages:Using the frequency transformer to change the voltage and isolate the electricity, ithas the following advantages: simple structure, high reliability, impact resistance,and good safety performance, MPPT DC voltage 200 V rating in the general-750V.

Disadvantages:(1) relatively low system efficiency.(2) heavy


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The advantages and disadvantages ofhigh-frequency isolation system

Advantages:Having the advantage of electrical isolation as well as light weight, system efficiency 93%.

Disadvantages:(1) As isolated DC / AC / DC power hierarchy generally smaller, so this

topological structure concentrated in the following 5 KW;(2) high-frequency DC / AC / DC the work of a high frequency, usually dozens

KHz, or higher, it is more difficult for EMC system design;(3) the impact of poor system.


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The advantages and disadvantages of thehigh-frequency isolation system

Advantages:Same as the first topology structure, eliminating cumbersome frequency transformer, we can bring thefollowing advantages: high efficiency, light weight. At the same time joined the BOOST circuit for DC /DC input voltage DC upgrade, solar array DC input voltage range can be very wide (70 V-750V).Disadvantages:(1) Similarly, the solar panels and electrical power grids not isolation, solar panels have bipolar voltagepower grids.(2) The use of high frequency DC / DC, EMC become even more difficult.

(3) Lower reliability.


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SG series PV Grid-connected Inverter

*Grid-connected PV system includes the PV modules, Grid-connectedinverter and network measurement devices and distribution system.

*Solar cells can generate DC power electricity*The power is changed to the same- phase, sine wave current through thePV Grid-connected inverter directly and enters into the power grids.

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Srt Power Point Presentation 1