Pemodelan dan Perancangan Sistem Interkoneksi Distributed Generation ( DG ) dalam Perbaikan Drop Tegangan pada Jaringan Distribusi 20 kV PT PLN (Persero) ULP Tanah Jawa

Abstract

Distributed generation (DG) is a power plant whose location does not care about the distribution of electricity suppliers. The application of DG has increased in the development of new and renewable energy. Using renewable energy is one way to support the Indonesian government's program to use renewable energy by 23% in 2025. This study focuses on a 20 kV distribution system that experiences a voltage drop, so modelling is carried out to analyze the effects of DG injection in the form of a micro hydro-power plant. The modelling and simulation were carried out using ETAP software and a few data from PT PLN ULP Tanah Jawa. The simulation is carried out by making loading conditions at the pass-time of peak load and peak load time. Distribution system conditions are simulated without DG interconnection, existing DG interconnection and new DG interconnection. The results show that the voltage drop value without DG was 26% when pass-time of peak load and 37% when peak load time, which means the voltage drop value did not meet the IEC/IEEE standard of ± 5%. When simulating the interconnection with the existing DG, the voltage dropped 24% at the pass-time of peak load and 35% at the peak load time. The simulation of interconnection with the planning of new DG capacity of 2 x 4.5 MW could produce voltage drop of 1% at the pass-time of peak load and 12% at the peak load time. However, it also resulting highest losses of 6563.40 kW and 9724.0 kVAR at the peak load time. The planning of new DG looks good to improve the supply voltage quality. However, it also causes losses to the electricity suppliers.