Mitigation of multiple voltage dips in a weak grid using wind and hydro-based distributed generation

In the year 2007, South Africa experienced high demands of electricity power than that could have been generated. Due to greater demand than the generation, the country experienced planned and unplanned load shedding. Hence the commercial operations, industrialization country´s economy and mostly people´s life styles were highly affected. The unplanned load growth, indiscriminate integration of distributed generation by consumers and power companies and faults on the system has resulted in poor power quality problems such as voltage dip among others. At the present time distributed generation (DG) has been experiencing a rapid development in a global scale. The size of hydroelectric plant and wind farms are increasing quickly and a large amount of renewable distributed generation is integrated into the grid daily. This paper presents the modeling and simulation of schemes with wind energy conversion systems (WECS) and hydroelectric plant (HP) for mitigation of multiple voltage dips within a short period of time on power system. The schemes are simulated using DIgSILENT Power Factory and the applicability of the WECS and HP as regard to mitigating multiple voltage dips are evaluated and compared within a short duration and from different fault locations.