Optimal Allocation of Photovoltaic in the Hybrid Power System using Knapsack Dynamic Programming

Indonesia, which is represented by PLN as stated- owned electric utility company, commits to increase the share of renewable energy mix up to 23% in 2025. One way to reach this goal is the commitment to solar power generation. However, generation from photovoltaic has intermittency that dependent on sun irradiation, so the stability of power system might be affected in certain cases. The stability problem can be anticipated by using a hybrid power system with the composition of photovoltaic, battery, and diesel. Optimal power flow and N-1 contingency simulation is conducted to determine and compare locations and the capacity of hybrid power system. Furthermore the composition of hybrid power system is evaluated by an frequency stability simulation and the LCOE is calculated. The appropriate hybrid power system is selected by applying a knapsack dynamic programming approach. The result of the calculation is the optimal location of the hybrid power system with photovoltaic capacity as planned. This method is applied to Sumbawa power system as a case study.

I. Introduction

The use of electrical energy generated from new and renewable energy sources is a fundamental trend in all utility companies in the world. The rapid development is due to the need for clean and environmentally friendly energy. Besides that, the depletion of energy reserves from fossils and the problem of global warming are the triggers of the use of renewable energy generation. Sources of new and renewable energy power plants currently being developed include water, geothermal, biomass, wind and solar. The development of wind and photovoltaic changes the nature of the electric power grid worldwide [1].