POWER QUALITY PERFORMANCE OF MULTI PHOTOVOLTAIC CONNECTED TO GRID UNDER VARIABLE SOLAR TEMPERATURE AND IRRADIANCE LEVEL
Photovotaic (PV) other than capable to result power, it also generates harmonics due to the presence of an inverter as a medium to convert DC to AC voltage so can reduce power quality. PV generator also has intermitten characteristic and generate power depend on environment condition e.g. temperature and irradiance level. The paper presents performance improvement of power quality due to the influence of multi PV integration to low voltage distribution line of 380 kV (phase-phase) 50 Hz on point common coupling (PCC) bus under variable solar temperature and irradiance level. The model consists of three PV generator groups with 100 kW active power. In addition to connecting on a three phase grid, PV generator is also connected to three groups of three phase loads with 20 kW active power each. The power quality parameters studied are voltage and current unbalance as well as voltage and current harmonics in eight scenarios PV generator connected on three phase grid. The single tuned filter is used to improve power quality using two conditions before and after filter installed. Multi PV models with three phase generators connected three phase grid, without and with single tuned filters at all irradiance and temperature levels results phase maximum voltage (phase A, B, and C) in relatively stable of 308 and 310 Volt respectively, and generating unbalanced voltage of 0%. The maximum phase current value, for system without single tuned filter at all irradiance and temperature levels are different as 12.5, 9.8, and 10 A, respectively, resulting in unbalanced current of 16.0991%. Under the same condition, single tuned filters are capable to balance maximum phase currents (phase A, B, and C) of 10.45 A respectively, so able to reduce unbalanced current to 0%. The implementation of single tuned filter can reduce unbalanced current values according limit ANSI/IEEE 241-1990. At a constant temperature and irradiance levels are increasing, voltage and current average harmonics (total harmonics distortion) are also increasing. The use of single tuned filter is the most effective in suppressing 5th harmonics so can reduce average value of voltage and current harmonics significantly within IEEE 519-1992.