No abstract

Optimum tilt angle of the photovoltaic (PV) modules are needed for determining the optimum solar energy producing in some specific area. Currently, there is no data for the optimum tilt angle in the area of Bukit Jimbaran Bali. In this paper, the optimization of the tilt angle of the on-grid 300-Wp PV plant model is presented using the PV system software simulation with solar radiation data are from Metronome 7.2. The system specifications on this research use a standard type module system, ground base disposition mounting, monocrystalline cell technology, and free-standing ventilation property. Using azimuth from 0 to 180 degrees in each direction and tilt angle from 0 to 90 degree with 1-degree interval, the simulations found that for fixed solar panels in a year, the optimum tilt angle values are from 12 to 18 degree in the azimuth of 0-degree direction with the system output at 528 kWh/year. The tilt angle is changed every six months, and for April to September, the optimum tilt angle is 32 degree at the azimuth of 0 degrees, while in October to March is in 24 degrees at the azimuth of 180 degrees with the system output at 561 kWh/year.

This research had done base on case study in the feeder of substation 20 kV Jababeka. Existing data showed that condition is well with not too long differential, over all setting on the Overcurrent Relay (OCR) – Ground Fault Relay (GFR) in the field is well. From calculated result can be seem that current of short circuit disturb is influenced by distance between disturbance points. Using over current relay has important purpose in the protection of electricity system. The qualification need setting minimum time of over current relay in the feeder not less than 0.3 second. This consider to the relay will not in trip condition in rush current from distribution transformator that has been connected in the distribution system when the feeder starts operated. Starting time for relay in the feeder is faster than work time in the incoming side with average time about 0.4 second for one phase disturbance side. But for three phase and two phase disturbance side, work time relay has interval time about 0.4 second and than increase with average increament about 0.1 second when transmission line is longer (from distance aspects about 0%, 25%, 50%, 75% and 100%).

Software development has many methods which are divided into traditional and agile categories. Traditional methods are known as heavy, rigid methods and have a lot of documentation, while agile is known as a lightweight, fast and a little documentation method. But there is a traditional method that has the flexibility and speed like the agile method, namely the prototyping method. Several prototyping methods are often used in building an application. The research aims to choose the right prototyping method for building a smart village application. The smart village application can be categorized as an application that requires a lot of communication with the user, where the user is a village community who has a certain culture and has a variety of educational backgrounds. The results of this study are that prototyping methods that are suitable for building smart village applications are evolutionary prototyping.

This paper discusses the implementation of microservices architecture in smart village applications. The smart village application is a village-based online marketplace that facilitates various business actors' buying and selling process in a village. This application manages five types of products: lodging reservations, tourist attraction tickets, culinary purchases, and purchasing knickknacks show tickets. The complexity of processes, data, and high potential users requires that the system architecture is designed to produce a scalable, fault-tolerant system and easy to develop. Microservices architecture is one of the recommended architectures for building a scalable, fault-tolerant, and maintainable application. This architecture has several variations, ranging from variations in communication between services to the technology used. The suitability of applications with architectural variations and the complexity is a challenge in implementing this architecture. This paper describes how to implement the microservices architecture in smart village applications. Design and implementation of the microservices architecture in the smart village application was followed the WSIM or Web Services Implementation Methodology stage. The implementation results show that the application is easier to manage because it is divided into independent microservices. Implementing asynchronous communication and a choreographic approach to each service makes the client application response faster; besides, it did not affect other services if there is a problematic service.