Land-based Wind Power Plant

The difference between EKO-PRO Land-based Wind Power Plant and EKO-PRO Off-shore Wind Power Plant is that the back of the land-based power plant tower rests on rollers instead of floats. The rollers roll over the base when the wind direction changes. Such solution may be very efficient in small and medium wind power plants provided considerable simplification and cost-effectiveness of the power generating set and regulation systems. Here is the description of the proposed solution:

Tower mounted on a rotary sleeve
Four small power generating sets instead of one big set
Simple string transmission gear with direct drive from the rotor's hub to the generator
Rotor blades fixed in a permanent position
Regulation system consisting in appropriate tilting of the frame with four rotors, with suspended ballast and a cam
Generation of variable current in synchronicity with the local power grid or of direct current with the battery set.

(Drawing 7) The drawing presents a wind power plant characterised by the above-specified features.

The table below shows initial technical data for this power plant. The average wind speed per year used in our calculation is assumed for a location in northern or central Poland, where the local conditions are good, or in the Polish seaside belt where the local conditions are medium.

Specification	Unit	Amount/number
Rated power	kW	4 x 3 = 12
Rated wind speed	m/s	9,5
Maximum wind speed	m/s	19
Average wind speed per year (h = 25 m.)	m/s	6,5
Annual volume of electric energy produced	kWh/a	30 000
Rotor diameters	m	4 x 5 m
Height of rotary tower	m	25
Tower mass	kg	1030
Rotors' mass	kg	290
Generators' mass	kg	120
Sleeve mass	kg	200
Mass of foundation with steel base	kg	3860
Total mass	kg	5500

Refurbished wind turbines, being in sell now; can be applied to structure of wind power plant according to EKO-PRO project. Recommended power outputs of such power plant are: 2x75 kW = 150 kW, 2x100 kW = 200 kW, 2x130 kW = 260 kW.