Abstract:
Renewable energy sources; which are abundant in nature and climate friendly are the only
preferable choice of the world to provide green energy. The limitation of most renewable energy sources
specifically wind and solar PV is its intermittent nature which are depend on wind speed and solar irradiance
respectively and this leads to power fluctuations. To compensate and protect sensitive loads from being
affected by the power distribution side fluctuations and faults, dynamic voltage restorer (DVR) is commonly
used. This research work attempts to withstand and secure the effect of voltage fluctuation of grid connected
hybrid PV-wind power system. To do so battery and super magnetic energy storage (SMES) based DVR
is used as a compensating device in case of voltage sag condition. The compensation method used is a
pre-sag compensation which locks the instantaneous real time three phase voltage magnitude and angle
in normal condition at the point of common coupling (PCC) and stores independently so that during a
disturbance it used for compensation. Symmetrical and asymmetrical voltage sags scenario are considered
and compensation is carried out using Power System Computer Aided Design or Electro Magnetic Transient
Design and Control (PSCAD/EMTDC) software.
