Amelioration de la qualite d'energie fournie au reseau autonome hybride eolien- diesel

The interconnection of remote and isolated regions to main electricity network is a very difficult and expensive task. In most of these isolated pockets, diesel engine based power generation is the main source of energy to meet their day to day electricity requirements. But, the regular diesel engine maintenance requirement, the increasing cost of diesel and its transportation to remote areas and pollution are the main drawbacks of such kind of system. Recently, the installation of renewable energy sources in these regions proved to be advantageous, as it results in to reduced dependency on the diesel engine and its associated problems. However, due to the intermittent nature of renewable sources, their reliability and functionality is still a major challenge. Moreover, the presence of non-linear current component due to domestic consumer load profile may further lead to poor power quality. The degradation of power quality in isolated network may result in to increased losses, mal-operation or even destruction of certain devices and unstable network operation. To address all the above discussed issues, an isolated wind-diesel hybrid system is developed, in which an active shunt power filter is introduced to compensate the harmonics and reactive power of load current demand. The proposed system is developed and tested in MATLAB/ Sim Power System environment, where the system works satisfactorily under both fluctuating wind and load power demand. An active dump load is also connected in the system to absorb the excessive wind power generation. Moreover, two different control algorithms for shunt active power filter based on indirect current control mode and d-q synchronous reference control mode have been implemented to solve power quality problem. The detailed simulation study is carried out to validate the proposed control approach.Keywords: Renewable energy - hybrid system- autonomous network - quality of energy...