Effects of Solar Photovoltaic Size on Grid-Connected Power System in Savannakhet Province, Lao People's Democratic Republic
Keywords:
PV generation, Power loss, Voltage profileAbstract
The trends of renewable energy system and clean energy have become increasingly worldwide to reduce greenhouse gas emission which is the important effect of global climate change. The electricity generation in Lao people's democratic republic (PDR) more than 70% is hydropower plants in 2017, which is not sufficient in the dry season. Therefore, solar photovoltaic (PV) system is suitable to integrate grid connection system with hydropower plants. In this paper, the analysis of solar PV installation with optimal size and location for grid-connected distribution system is proposed. The electrical parameters for estimating the electrical effects are the active power (P), reactive power (Q), voltage (V), current (I), active power loss, and reactive power loss. In addition, PV installation was explored with 5 cases: 25, 50, 75, 100 and 125% of the peak load in Nongdern substation (22 kV and the 2nd feeder). The system was simulated by DIgSILENT PowerFactory software. The optimal capacity size of PV installation connected in the bus Phonxay substation is 75% of installed capacity. The minimum value of active power and reactive power loses are 0.11 MW and 3.32 MVAR, respectively. Moreover, the voltage increases from 0.976 to 1.003 p.u. The outcome in this project to subsidize the clean energy resource and the best planning in power system for PV installation in Savanakhet Province. The power system will be reliability and stability for supply power energy to customers. Moreover, it achieves the one target of policy’s Ministry of Energy and Mine to promote and develop the solar energy.
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