Conference programme

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Delegates are invited to meet and discuss with the poster presenters during the poster presentation sessions between 10:30-11:30 and 16:00-17:00 on Thursday, 19 November 2015.

Lead Session Chair:
Stephan Barth, ForWind - Center for Wind Energy Research, Germany
Frits Ogg O2G Sustainable Energy Solutions, The Netherlands
Ogg Frits (1) F
(1) O2G Sustainable Energy Solutions, Nijmegen, The Netherlands

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Presenter's biography

Biographies are supplied directly by presenters at EWEA 2015 and are published here unedited

Frits Ogg is an author, guest teacher and consultant in the field of sustainable energy and automation. In 1978 he was co-founder of the Dutch sustainable energy organisation ODE. He is specialised in sustainable emergency energy supply, small biogas, photovoltaics, small / medium wind and community wind. He was formerly editor-in-chief of WindNieuws, the Dutch wind energy magazine. He writes among others for Windtech-International. He has a degree in education (electrical engineering, Fontys University of Applied Sciences in Eindhoven), industrial marketing and industrial engineering (euro I.E., Avans University of Applied Sciences in Breda) .


Poster Download poster (12.29 MB)


Medium size windturbines and grid integration


Medium size windturbines and grid integration

All over the world islands and regions are trying to get 100 per cent renewable energy. There are places with an uncontrolled growth of PV. Islands and rural communities have weak grids in which they have to balance supply and demand. Great MW windturbines require a strong grid and a good logistic circumstance. Therefore there is still a demand for medium size windturbines.
In the next years by using more renewables, balancing grids is inevitable. Medium turbines have just as MW turbines to become smart helping to keep the grid stable and clean.


The investigation was to find out which manufacturers and which technologies are available for weak grids and island grids that can coop with a grid in which there is more then 100 per cent supply of renewable energy and especially more than 100 per cent wind. The investigation is based on the Small Wind World Report (SWWR) of the WWEA ( and desk research. The scope of the investigation are windturbines with a generator between 50kW and 300kW.

Main body of abstract

Smart grids require smart windturbines. As MW windturbines are already smart because of regulations required by grid operators, a lot of medium windturbines are not. To keep the price of medium windturbines low, most medium windturbines are made with (licencies and) technics from the nineties in the last century and are simple.
A smart windturbine can handle problems that arise when an island or weak grid has to be balanced. Unbalance for instance can be caused through conventional windturbines itself by delivering more than 30 per cent wind in a grid, in cooperation with solar, other renewables or through different loads. A smart medium windturbine should also handle power quality issues as reactive power and harmonics.
A medium size windturbine is a windturbine that's to big for a household and to small for a village. As manufacturers sell the same windturbines in several countries under different nominal power rates and countries use different nominal power rates in their regulations it is not possible to give an exact universal definition of what a medium windturbine is. In practice this is the range from approximately 5 kW to 1 MW divided in two ranges 5 kW to 300 kW and 300 kW to 1 MW. 300 kW as a technical split because of the unbalance in island and weak grids caused by using current medium windturbines greater then 300 kW. The range 5 kW to 100 kW fits farms, small communities and small enterprises. The range of 100 kW to 300 kW fits medium enterprises, rural communities with long supply lines and urbanised communities with a weak grid. Also in Europe are situations where only medium size windturbines are economically and/or logistically feasible.


We found out that only half of the 68 manufacturers worldwide where represented in the SWWR report. Only 11 of these manufacturers have or are working on a windturbine with good power quality that can coop with a SCADA system in a smart grid. Only a few manufacturers have a track record. Beside manufacturers of smart medium windturbines there are also 10 manufacturers outside the windindustry that develop sytems to be placed on new or refurbished windturbines or make energy balancing systems for island and weak grids. The results will later also be incorporated in the next SWWR report and published in WindTech-International.

Learning objectives
Refurbishing costs are high, so for consumers it is caveat emptor and for manufacturers of medium size windturbines be aware that sooner or later your product has to coop with a smart grid. New products must have a track record before going to market.