Power Electronics and Renewable Energy Systems – a perfect match for a sustainable society

Abstract

The energy consumption is steadily increasing very rapid due to more people on the earth, better
living conditions as well as we are trying to live in areas where the energy demand is high. The
economy growth in the last century has not been possible without low prize of energy which has been
achieved by fossil fuels. Looking into the future – the fossil fuel resources have a time limit – which
can appear faster than expected – both because of the limited resources but also because the market
can suddenly increase the prize. Therefore there is a demand to come up with sustainable energy
solutions for energy production like wind turbines, hydro power as well as photovoltaics. At the same
time it is evident that by the use of new technology it is possible to make energy saving. In both
situations power electronics are making this possible – we are using power electronics to interface
renewable sources to maximize the energy yield from wind turbines and photovoltaics as well as
smoothly integrate it to the grid. Also in many applications we use power electronics to interface a load
with the grid and control the behavior of the electrical equipment according to the demand. In many
cases power electronics is able to ensure a large amount of energy saving like in pumps, compressors
as well as in ventilation systems. Also the transportation gain a lot of using electricity instead of fossil
fuel – clearly made possible due to the power electronics.
Denmark is one of the societies which have been the frontier of implementing the renewable
technology and has today covered more than 50 % of the electrical energy consumption by means of
renewable and has as ambition to be fully independent on fossil fuels in 2050. Already in 2035 100 %
of the electricity will be covered by renewables. At the same time the energy consumption has not
really increased for 20 years despite the GDP has grown by more than 60 % - much is enabled by
energy efficient technologies based on power electronics. So renewables and power electronics are a
perfect tool for a sustainable society.