trends in decentalised electrification ueberarbeitet · trends in decentralized electrification...

Trends in Decentralized Electrification

Michael Wollny, SMA Technologie AG, Niestetal

Industry Forum - Off Grid Power Supply for Rural Electrification -June 24th, 2005; Freiburg, Germany

2Trends in Decentralised Electrification

Main Industry Areas of China

3Trends in Decentralised Electrification

Main Power Supply Network of Senegal

4Trends in Decentralised Electrification

State of the Art

Electricity consumers have predominantly been supplied by remote central power stations

Increase of the distribution grids is cost intensive and often not economical

5Trends in Decentralised Electrification

What we need are...

Decentralised small generation systems for combined heat and power production

Power supply systems located nearby the consumers and effectively using the local available energy sources (especially renewable energy)

Solutions are needed which are technically feasible andmmatch the conditions of sustainability

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Modular AC compatible Hybrid System Technology

7Trends in Decentralised Electrification

Modular AC compatible Hybrid System Technology

8Trends in Decentralised Electrification

Grid Connected PV Systems

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Principle of Grid Feeding

... up to the megawatt range

... from the pioneer of String

Technology

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Stand alone and Island Grid Applications

PV-Module Battery (12 V)

Charge Controller

DC-Loads, 12 … 48 V

Optional

Inverter

AC-Loads, 120/ 230 V60/ 50 Hz

Solar Home Systems with option of AC Generation

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Stand alone and Island Grid Applications

Small AC power supply system with DC coupled components

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AC-coupled Hybrid System for Standalone Application

Power range: 4 - 50 kW

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AC-coupled Hybrid System as Utility Backup

Power range: 4 - 50 kW

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Sunny Island Maxi for upper kW Power ranges

Power range: 40 - 250 kW

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Advantages of Flexible Modular AC-coupled Systems

Structure 100 % compatible with the public grid

Coupling all consumers and generators on the AC-side

Power range above several kW´s

Different renewable and conventional energy sources form a hybrid system

Highest reliability due to redundant system configuration

All components add up their power in parallel operation

Using the standard PV string technology

Construction of distributed networks

Easy expandability, suitable to be connected to the public grid

Reduction of system costs

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Reduction of System Costs

0

0,001995 2000 2005 2010

Year1990

,50

1,00 200

100

PV Inverter (1...10 kW)

Specific Price

Spec

ific

Pric

e [€

/W]

AC

Prod

uctio

n Q

uant

ity [

1000

Pie

ces/

a]

Standalone systems and small Off-Grid Plants in the kW range are cost effective than systems using diesel generators

17Trends in Decentralised Electrification

Modular PV Systems in China in the next Year

Installation of further 200 modular PV-Hybrid Systems in provinces of China (Yunnan, Xinjiang, Gansu and Qinghai)

Yunnan

Xinjiang

Gansu andQinghai