«ADVANTAGES AND DISADVANTAGESOF ON-GRID SOLAR POWER PLANTS BASED ON

EXPERIMENTAL STUDIES IN TAJIKISTAN»

Ankara, Turkey

3-6 October, 2016

“International Conference on Science and Technology"

PROFESSOR U.MADVALİEV,TAJİKİSTAN

Map of the Republic of Tajikistan

Energy Status of the Republic of Tajikistan

Installed grid power - 5160 MWh; Average annual generation of electricity - 16.5

billion kWh; Length of power lines on highway - 60500 km; Number of grid customers – 1,129,500 (1989 -

862,300).

Issues and Challenges

Seasonal nature of HPP; During fall and winter seasons electric power

generation is at its lowest point while its demand is at its highest;

During summer seasons the excess of electric power is 3-7 billion kWh;

Access to the sale of surplus electricity locked in the summer, and no option to import a winter power shortage;

Since 1991, consumption of natural gas has decreased because of its deficiency.therefore the main method of space heating is by electricity

Daily Average of Electricity Supply of Region of Republican Subordination (DRS)

Daily Average of Electricity Supply of Sughd Region

Daily Average of Electricity Supply of Khatlon Region

Solution to the Problem of Power Deficiency

Construction of Roghun HPP; Development of small-scale HPP industry; Development of renewable energy resources industry.

Solar Energy Potential of the Republic of Tajikistan

In the Republic of Tajikistan the sun shines 280-330 days in a year ;

Total solar radiation under clear skies reaches 7500-8000 MJ per 1 sq. m.;

Total duration of sunshine ranges from 2100 to 3170 hours per year.

Solar Panel Electrical Power Stations

(On-Grid Systems)

Schematic diagram of the on grid solar power system

On grid solar power systems in the Republic of Tajikistan

Republican National Medical Center (Qhariyai Bolo) (Grant of Government of Japan, implemented by Marubeni

Corporation together with OJSC Systemavtomatika)

Republican National Medical Center (Continue)

- Solar power plant with total capacity of 120 kW;- Place of installation - Central Clinical Hospital in

Dushanbe.- Class of installation – On-Grid, i.e., works directly with the

an electrical network.- Solar panels (576 pcs.) - Kyocera, maximum power output

1 -210 W- Inverters - 12 x 10 kW – Kyocera- The tilt angle - 30°, solar panels are directed strictly to the

south.- System start - 24.07.2012

Schematic Diagram of Installation

Monthly Statistics

September - 2013The total solar radiation - 166.8 kWh / m2The average air temperature of 23.7 ° CPower output (per month) - 9575.5 kWh

Annual Statistics

020406080

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Total solar radiation kWh / m2

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Температура

Institute of Gynecology, Dushanbe

Institute of Gynecology, Dushanbe (Continue)

- Capacity of Solar Power Plant - 40 kW;- Place of installation - Institute of Gynecology in Dushanbe;- Class of installation – On-Grid, i.e., works directly with the electrical network;- Solar panels (192 pcs.) Kyocera, the maximum power output of the one solar panel - 210 W;- Inverters - 4 x 10 kW - Kyocera;- The tilt angle - 30°, solar panels are directed strictly to the south.- System start - 24.07.2012

Schematic Diagram of Installation

September 10, 2013The total solar radiation - 5.1 kWh / m2The average temperature of air 25.8 ° CPower output (per day) - 132.9 kWh

Examples of Statistics Report Generated by Software Maint(Kyocera)

September - 2012The total solar radiation - 137.3 kWh / m2The average temperature of air 22.1 ° CPower output (per month) - 4264 kWh

Monthly Statistics

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Total solar radiation kWh / m2

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Power output (kWh)

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Температура воздуха

Annual Statistics

Monthly efficiency of power plant of the Inst. of Gynecol.for the entire period of operation

Sample results of daily data of on-grid solar power plants

The monthly data of on-grid solar power plants in Tajikistan

Technical Challenges to Overcome for the Use of Solar Energy in the Republic

of Tajikistan

Poor quality of electricity in urban areas(required for On Grid systems);

low or high voltage network in the city; a power outage of network reverse phase sequence; Budgetary organizations have little to no

interest in the full use of energy-efficient systems;

Absence of a clear mechanism of interaction between the owners of solar systems and energy companies.

Presence of Harmonics in Electrical Networks

Unstable Voltage in Power Grids

Unstable Voltage in Power Grids

Frequency Instability in Electrical Networks

Malfunction on Grid System

System Failure due to high voltage in city network. Inverter Protection disconnects itself from the city network and switches to 10-minute standby mode to improve network parameters.

Daily Statistics

THANK YOU!