Non-uniform Rooftop PVs Distribution Effect to Improve Voltage Profile in Residential Feeder

This paper presents the simple design of a grid-tied single-phase with distributed rooftop photovoltaic (PV) non-uniformly location and ratings. All the inclusion components in the developed scheme are estimated and defined as the inevitability of low voltage (LV) residential network. This developed scheme is purposed for allocating AC and DC load, which are divided into four steps: the sized determination of PV inverter (1-5kW), the selection of PV array, the size determination of battery and the selection of other supporting components. The purposed configuration consists of modeling the system with non-uniform distributions of rooftop PVs, modeling the rooftop PVs based on their injected active and reactive power, and finally the inclusion of battery storage, based on its state of charge (SOC). Due to test the configuration, several cases are built in the MATLAB platform. Simulation results have been generated and analyzed for an unbalanced three-phase residential feeder which is populated with rooftop PVs and battery storage (BS). The simulation results show that the unbalanced reduction due to the coordinate of PVs and BS that provided educated energy storage when the unequal loadings are there, have significant effect toward the anxiety of the distribution network are successfully done

Inverter Model and Control Strategies for Single-Phase Rooftop Photovoltaic in Unbalance Three–Phase Residential Network

The installation of single-phase rooftop photovoltaic (PV) are growing world widely, which have several benefits and drawbacks in residential low voltage (LV) distribution system. In one hand, this distributed generation (DG) is easy to install, has low maintenance costs, and subsidies in price. On the other hand, as PVs are installed, without controlling their ratings and locations it may deteriorate the overall grid performance including reversed power flows, high losses and unacceptable voltage profiles. This paper proposes modelling and controlling strategies for grid-tied, rooftop PV inverters that address some concerns of high penetration PV while also adding several benefits to the utility. The modelling strategy contains of a proper inverters’ control, which is developed in order to extract the maximum amount of the photovoltaic generator. The control strategy does not require an advanced communications infrastructure, however it allows for several collective controls of active and reactive power outputs of the PV units and their grid-tied inverters. The proposed strategies are simulated in Matlab/ Simulink platform. The results show that the inverters are devouring very less voltage and current harmonic and able to maintain approximately constant voltage profile for highly unbalanced system

Wireless Data Communication Techniques to Coordinate Distributed Rooftop PVs in Unbalanced Three-phase Feeder

A necessity of the availability of communication network to provide data transfer amongst the coordinated single-phase rooftop photovoltaic (PV) in unbalanced three-phase low voltage (LV) feeder is essential since fetching data within the sensor of each PV unit requires real-time measurement and reliable data exchange within smart grid (SG), loads and other PV units. The main objective of this paper is to model the popular Wi-Fi, WiMax and ZigBee wireless data communication techniques into algorithms using numerical analysis. Those communication technologies have low cost and low power consumption. The benefits and drawbacks of those considered wireless data communications are shown as the required data that transferred and appropriate coding is also proposed. The number of transmitted symbols and the processing time delay of the proposed data coding are numerically analyzed, the results indicated that the 100% penetration level of PV that resulted higher injected reactive power back into the networks is able to be overcome since the coordinated PVs along the feeder is communicating to lower the unbalanced voltage profile

Preparation of C4-silica Gels from Waste Glass and Tributylamine

Waste glass materials coming from municipal and industrial processes have become a serious problem for the environment in the near future. Silica gels have been long attracting attention since it is widely used for many applications. It had also been studied by several fields because of its surface properties. In this study, semi-polar silica gels have been synthesized. C4-silica gels have been prepared by reaction between tributylamine (TBA) and silica gels produced from waste glass. The waste glass was powdered, soaked in NaOH, then heated at 400 oC to obtain sodium silicate. Silica gels were produced by neutralized the sodium silicate using HCl, dissolved in H2O, and dried in an oven at 80 oC. Silica gels were solubilized in TBA, stirred, and dried in the oven to obtain C4-silica gels. Silica gels were characterized by X-ray Diffraction (XRD), while Infra Red (IR) and Scanning Electron Microscopy (SEM) analyses were conducted to obtained C4-silica gels. XRD analysis of silica gels showed that the highest peak intensity was observed at 2θ = 22.655°. The band at 1381.03 cm-1 in the IR spectrum was attributed to the nitro-oxygen bond (N-O). SEM images showed that the surface of C4-silica gels was smoother and more flat than the previous silica gels

Harmonic Impact in Induction Generator Voltage Using Thyristor Control Reactor

As commonly known that theload fluctuations that have been performed on an induction motor operated as an induction generator (IG) triggers unstable induced voltage and frequency. Asthe result, the load that receiving the power quality is not running properly and the efficiency is low. The problems that have beenmitigated in this research in such way is the stability of the voltage that generated by IG due to fluctuating loading, and the harmonics can be damped by single tuned due to the work of thyristors and non-linear loads. The used method is the Ziegler-Nichols method by measuring and testing the design of prototype to get the best performance in stabilizing the voltage by using thyristor control reactor (TCR). The results showed that the induced generator with single tuned filter and TCR to nonlinear load variation at 1618 RPM is maintained stably for the voltage and frequency. Although, 3rd order harmonics of voltage and current that has been tuned can be dampedby using THDI 8.36%. Furthermore, it can be said that the response that generated by voltage control system using proportionalintegral (PI) control in 1kW-4 poles three-phase IG with additional and reductionalload generated a stable response

HUBUNGAN PERILAKU PERAWATAN KAKI DENGAN KUALITAS HIDUP PASIEN DIABETES MELITUS

Perilaku perawatan kaki merupakan bagian dari upaya pencegahan primer atau utama pada manajemen kaki diabetik. Perawatan kaki bertujuan untuk mencegah terjadinya komplikasi kronik, yang berupa neuropati diabetik atau kematian saraf kaki sehingga dapat menyebabkan ulkus kaki diabetik. Penelitian ini bertujuan untuk menganalisis hubungan perilaku perawatan kaki dengan kualitas hidup pasien Diabetes Melitus di RSU Muhammadiyah dan Klinik Rulia Medika Ponorogo. Desain penelitian yang digunakan adalah studi korelasi. Populasi dalam penelitian ini adalah pasien Diabetes Melitus di RSU Muhammadiyah dan Klinik Rulia Medika yang berjumlah 41 pasien. Teknik pengambilan sampel purposive sampling dengan besar sampel sebanyak 41 pasien. Pengumpulan data menggunakan kuesioner perilaku perawatan kaki dan kuesioner kualitas hidup (WHOQoL-BREF). Data dianalisis menggunakan uji Chi-Square menggunakan aplikasi SPSS. Hasil penelitian didapatkan mayoritas pasien berperilaku perawatan kaki positif sebanyak 27 pasien (65,9%) dan pasien kualitas hidup tinggi sebanyak 22 pasien (53,7%) dan kualitas hidup cukup sebanyak 19 pasien (46,3%). Dari penelitian didapatkan nilai signifikan 0,020 (α < 0,05) sehingga terdapat hubungan perilaku perawatan kaki dengan kualitas hidup pasien Diabetes Melitus di RSU Muhammadiyah dan Klinik Rulia Medika Ponorogo. Diperlukan perilaku yang positif dalam melakukan perawatan kaki sehingga risiko terjadinya komplikasi bisa diminimalisir, terutama risiko terjadinya ulkus kaki diabetik yang juga akan berdampak pada kualitas hidup pasien Diabetes Melitus

A Concept of V2G Battery Charging Station as the Implementation of IoT and Cyber Physical Network System

The integration of the internet of things (IoT) and cyber physical network into the battery charging station system is critical to the success and long-term viability of the vehicle to grid (V2G) trend for future automobiles in terms of environmental and energy sustainability. The goal of this article is to create a V2G battery charging station concept using the internet of things (IoT) and a cyber physical network system. The V2G charging station concept was developed with the idea that every charging electric vehicle (EV) can communicate and coordinate with the charging station's control center, which includes a cyber physical system that addresses privacy and security concerns. The communication protocol must also be considered by the charging station. The preliminary test has been taken into consideration. Normal hours (for case one), peak hours (for case two), and valley hours (for case three), respectively, were created as charging circumstances for EVs at charging stations. Simulations were run for each of the three case scenarios. Each EV's battery state of charge (SoC) is provided a 50 percent initial charge and user-defined SoC restrictions. The MATLAB/SIMULINK platform was used to run the case simulations. The grid frequency, charging station output power, and the EV's battery SoC were all observed during the 24-hour simulation. As a result, the developed V2G charging station concept can regulate its input and output power depending on the battery status of the EVs inside the charging station, as well as provide frequency regulation service to the grid while meeting the energy demand of EV customers

Integrated arrangement of advanced power electronics through hybrid smart grid system

As an enabler component for renewable energy integration, power electronics (PE) technology in smart grid system is one of the most important issues of development the electrification, decentralization and information-technology/operation-technology (IT/OT) digitization within the electrical energy transmission and distribution systems. The arrangement of PE may different along the feeder either for grid-connected photovoltaic (PV), wind turbine, fuel cells, wave energy system and battery storage unit, respectively.This is due to the electric voltage that might need to be converted from alternating current (AC) to direct current (DC) and vice versa. For that reason, this paper proposed a concept of advanced PE as an integrated arrangement of several AC/DC/AC-and DC/AC- converters in such ways that support thepreviously mentioned grid-connected hybrid renewable energy sources and distributed generators (DGs) along the distribution feeder. Additionally, for the system that supported by battery storage unit, then this hybrid smart grid concept might become the answer for future utility needs

Implementasi Inovasi Samsat Delivery Dalam Meningkatkan Mutu Pelayanan Publik Pada Kantor Bersama Samsat Merauke

Abstrak Penelitian ini bertujuan untuk Mengetahui dan menganalisa Implementasi Inovasi Samsat Delivery dalam Meningkatkan Mutu Pelayanan Publik pada Kantor Bersama SAMSAT Merauke dan Mengetahui dan menganalisa dukungan dan hambatan dalam pelayanan Inovasi SAMSAT Delivery. Metode yang digunakan dalam penelitian ini adalah metode kualitatif dengan teknik pengumpulan data berupa wawancara, observasi, dokumentasi dan studi kepustakaan dengan pendekatan deskriptif kualitatif. Metode analisis yang digunakan adalah model interaktif menurut Miles dan Huberman dengan partisipan yang berjumlah 2 orang. Hasil penelitian menunjukan semua hal yang berkenaan dengan pelayanan SAMSAT Delivery seperti prosedur pelayanan diinformasikan dengan jelas. Informasi atau penjelasan tentang inovasi pelayanan SAMSAT Delivery disampaikan secara konsisten oleh petugas/pegawai Kantor SAMSAT dalam menyampaikan Inovasi SAMSAT Delivery sesuai dengan apa yang telah ditetapkan atau tertuang dalam kebijakan tersebut yang berkenaan dengan pelaksanaan Inovasi SAMSAT Delivery di Kantor SAMSAT Kabupaten Merauke. Inovasi ini juga didukung oleh sumberdaya yang cukup tetapi masih kurangnya petugas dan kurangnya kejelasan SOP. Faktor pendukung dalam Inovasi SAMSAT Delivery antara lain sarana prasarana sedangkan yang menajdi faktor penghambat antara lain jumlah pegawai yang tersedia, cuaca yang tidak mendukung, wajib pajak yang susah dihubungi, kendaraan yang rusak, jarak pelayanan dan jaringan internet