Wind generated electric power out put at Gharo has been estimated by using the 600kW wind turbine Bonus 600/40 MK IV type. The cut-in wind speed of turbine is 3m/s and cutout wind speed is 25m/s. Rotor diameter is 44 meters and hub height has been taken as 50 meter. The monthly and annual wind generated electric power out put at Gharo-Sindh along with capacity factor are given in Table-1a, b and the month-wise hourly wind power output is given in the Appendix. The minor differences between the output electric energy shown in Table-1a & b and in Appendix are due to calculations on monthly and hourly basis respectively.

 

Table-1: Hypothetical wind generated electric energy output & capacity factor for a Bonus 600/44MK IV turbine at Gharo

(Year-2002)

PMD Calculator (using 50M)
Months	Capacity Factor	kWh per Month
January	13%	57745
February	16%	65384
March	16%	69869
April	30%	127689
May	60%	268240
June	45%	194703
July	68%	305321
August	35%	157142
September	43%	187858
October	12%	53867
November	10%	44324
December	13%	59327
Annual	28%	1495808

The wind turbine specifications are given below in Table-2 & 3.

Table-2:  Wind Turbine Specifications

S.NO	DESCRIPTION	UNIT	TYPE
1	Turbine		Bonus 600/40 MK IV
2	Power	kW	600
3	Cut-in wind	m/s	3
4	Cut-out wind	m/s	25
5	Rotor diameter	m	44
6	Hub height	m	50

Table-3 Wind Turbine Specifications

S.NO	DESCRIPTION	UNIT	TYPE
1	Plant Capacity	MW	18
2	No of wind Turbines	Number	30
3	Plant factor	(Estimate %)	30
4	Life time	Year	20
5	Weight of Heaviest part*	Ton	20
6	Weight of tower*	Ton	20-30

Note: Towers are manufactured as a lattice tower or a tubular tower. Towers are always manufactured in at least two pieces for assembling at the site. The heaviest part is not weighing more than 20 tons.

Using the measurement of wind data the annual energy production by an 18-MW farm consisting of thirty-600KW turbine will be about 45 million kWh. Taking into account the wind turbine availability, net loses and wake effect in the wind farm, the net annual energy production is estimated 31 million kWh per year, corresponding to a capacity factor of 28%. It is important to note that the wind does not blow all the time. Since typical storage is not possible other fuel sources are used when the wind is not blowing.

 

Pakistan Meteorological Department

WIND ENERGY PROJECT

A Project funded by Ministry of Science & Technology

Energy Production from Wind