Design and Economic Analysis of Grid- Connected Photovoltaic on Electrical Engineering Building in Universitas Andalas

Abstract

This paper proposes a design and economic analysis of grid-connected photovoltaic power system on the roof of Electrical Engineering building in Universitas Andalas. The system is designed based on a real measurement data of small scale 1.25 kWp PV system on the rooftop Electrical Engineering Department and upscale to reach system designed. The PV system design result shows that the peak load of Electrical Engineering Department can be shaved from 29.5 kW to be 15.9 kW by install 104 solar panels or 26 kWp PV system. The initial investment required to build the PV system is IDR 445 million. The economic feasibility study has considered weather conditions from BMKG data per year and discount rate 4.25%. The result of economic analysis suggests that the development of PV system on the Electrical Engineering building based on MV tariff is feasible for all feasibility criteria. However, for social tariff was used the cost of PV energy per kWh higher than PLN tariff IDR 735 per kWh. This value indicate that the project is not profitable. Therefore, the installation of on grid PV system for university building need to considered the recent electrical tariff regulation. Keyword-PV System design, economic analysis, NPV method and peak load reduction I. INTRODUCTION Indonesia is one of the countries that pass through the equator and have tropical climate so that the potential of solar energy in Indonesia is quite high. The potential of Indonesia's natural resources is very large, especially from solar energy if it can be exploited properly. The average daily solar energy potency reaches 4.8 kWh/m 2 because sunlight is available almost from morning till late afternoon [1]. However, the solar energy which has been utilized only about 71.02 MWp both grid and off-grid connected [2]. The reduction and elimination of electricity subsidies and the enactment of incentives for renewable energy use led to an increase in the development and construction of photovoltaic on roofs of houses and buildings [3]. In addition to being environmental friendly, the construction of photovoltaics at the load center can reduce network losses, reduce land investment costs and reduce dependence on fossil energy, thereby enhancing energy sustainability and independence. Universitas Andalas as one of national University in West Sumatera will build its own power plant based on renewable energy power generation toward be one of energy-independent campus in Indonesia. The electric power consumed by Universitas Andalas Buildings is around 1500 kW which has been supplied by National Electricity Company (PLN) grid. Universitas Andalas must paid not less than IDR 700 million per month for electrical energy. Electrical Engineering Department as one of building in the Universitas Andalas have concrete floor space on buildings rooftop potentially to install solar power plant. However, to obtain accurate solar energy expediency analysis, it is necessary to study the feasibility of technology and finance of rooftop PV system installation. Several studies of desi...

Investigation of Photovoltaic Hosting Capacity Using Minimum Generation Operation Approach

“…The advantage of this technology is that the solar modules used can be installed in almost any location exposed to sunlight [5]. The potential for solar energy in the tropics that cross the equator is around an average of 4.8 kWh/m2/day [6]. The location of Indonesia which is on the equator theoretically will always be exposed to the sun for 10-12 hours a day and almost all parts of Indonesia will receive a relatively even intensity of radiation.…”