DESIGN OF CONNECTION OF A SOLAR POWER PLANT TO THE DISTRIBUTION NETWORK

Vsak elektroenergetski sistem mora kot osnovni cilj zagotoviti porabnikom električne energije zanesljivo oskrbo s kakovostno električno energijo. Zato je bil ustanovljen standard o kakovosti napetosti v javnih razdelilnih omrežjih - SIST EN 50160. Namen diplomskega dela je bil načrtovanje priključitve in raziskava različnih vplivov na kakovost električne napetosti ob vključitvi sončne elektrarne na razdelilno omrežje. Meritve smo izvajali na odseku, kjer sončna elektrarna ni priključena neposredno v transformatorsko postajo ampak je med priključkom in njo še nekaj odjemalcev električne energije. Prva metoda diplomskega dela je bila izvajanje meritev kakovosti električne napetosti po standardu SIST EN 50160, pred in po priključitvi sončne elektrarne na omrežje z ustreznimi merilniki - FLUKE 1744 Power Quality Logger. Pri drugi metodi smo uporabili programski paket za analizo in načrtovanje razvoja razdeljevalnega omrežja - GREDOS in s pomočjo programa preverili rezultate, ki smo jih pridobili z meritvijo kakovosti električne napetosti. Glavni problemi, na katere smo naleteli, so bili: povišana napetost, neravnotežje napetosti in harmonsko popačenje napetosti.Every power system has as primary goal to provide customers with a reliable quality electricity supply. Therefore a voltage quality standard in public distribution networks established - SIST EN 50160. The purpose of the graduation thesis was the design of a solar power plant connection to the distribution network and study various influences on the quality of electricity supply. Measurements were carried out on a section, where the solar power plant is not directly connected to a transformer station, but on the connection between it and some consumers of electrical energy . The first method of the thesis was measurements of voltage quality standard - SIST EN 50160, with appropriate gauges - FLUKE 1744 Power Quality Logger .In the second method we used a software package for the analysis and design of distribution network development - GREDOS, to check the results, which were obtained by measuring the voltage quality .The main problems that we encountered were: increased voltage, voltage unbalance and harmonic voltage distortion