In general, the application of Self-Excited Induction Generator (SEIG) or Synchronous Generator (SG) on the Stand-Alone Micro Hydel Power Plant (MHPP) is equipped with Electronic Load Controller (ELC) to control generator output during variations in consumer load. One type of ELC that is cheap and rigid developed today is the ELC, which is constructed by the uncontrolled bridge rectifier with DC Chopper. Based on the operational concept, basically this type of ELC can be implemented on both SEIG and SG, but both of these generators will have a different harmonic distortion effect on the output and its load. This paper examines the differences in the effects of harmonic distortions due to ELC installation on SEIG and SG. The initial stage of this study was to design the ELC developed. Then, the harmonic distortion response due to the installation of ELC on SEIG and SG is tested, which includes harmonic distortion in: stator current, PCC voltage, and consumer load current. THD_I(Current Total Harmonic Distortion) stator current at SEIG with ELC has shown an average value smaller than the THD stator current in SG with ELC. Likewise, the THD_V (Voltage Total Harmonic Distortion) value of PCC voltage and THDI value of the current consumer load on SEIG equipped with ELC has been shown to be smaller than the THD_V value of PCC voltage and THD_I value of the current consumer load on SG equipped with ELC. The effects of harmonic distortions due to the installation of ELCs that developed in this study on SEIG is still within the permitted limits, while on the SG, the harmonic distortion reduction is needed at the generator output.

Alternatif yang dapat dipilih untuk meningkatkan daya keluaran photovoltaik yakni dengan menambah intensitas cahaya yang diterima menggunakan reflektor. Namun apabila intensitas ditambah akan menyebabkan kenaikan temperatur yang ikut seiring dengan peningkatan intensitas cahaya, hal ini akan menurunkan daya keluaran photovoltaik. Untuk mengoptimalkan penggunaan reflektor pada photovoltaik perlu ditambahkan sistem pendingin. Tulisan ini bertujuan untuk melihat pengaruh penambahan sistem pendingin Heatsink pada photovoltaik yang dilengkapi dengan reflektor. Heatsink ditempelkan pada seluruh sisi belakang panel, dan untuk memperkecil resistansi termal, maka antara panel dan Heatsink diisi dengan paste termal. Pengamatan dilakukan dengan membandingkan 2 sistem, yaitu: sistem photovoltaik menggunakan reflektor tanpa pendingin dan sistem photovoltaik menggunakan reflektor yang dilengkapi sistem pendingin Heatsink. Hasilnya menunjukkan bahwa bahwa dengan penambahan sistem pendingin photovoltaik yang dilengkapi reflektor diperoleh penurunan suhu rata-rata 18,26% dan peningkatan daya rata-rata sebesar 10,14% dibanding sistem photovoltaik yang dilengkapi reflektor tanpa sistem pendingin.

<p>The aplication of Electonic Load Controller (ELC) on Self-Excited Induction Generator (SEIG) driven by renewable energy sources creates harmonic issues. This paper has analyzed the propagation of the harmonic current generated by the ELC in the generator system. Mathematical modeling and computer simulation is used to analyze the propagation of harmonic currents generated by ELC on the generator system. Laboratory testing has also been conducted to justify the simulation results. The study results showed that the propagation harmonic currents created by ELC on the stator widings of SEIG and main load side are rejected for high order components, and attenuated for lower order components. Consequently, the THD_I of stator and main load current will be reduced significantly<em>.</em></p>

No abstract

In public and commercial buildings, the reduction of electricity consumption activities can be conducted through 3 paths, including improving the quality level of electric power, increasing the efficiency of electrical equipment, and reducing the waste of electric energy use. In this paper, the energy losses reduction potential on the distribution line of Engineering Faculty, Andalas University buildings through electric power quality improvement are analyzed. Power Quality (PQ) variables that considered in this analysis include power factor, unbalance current load and harmonics distortion. Analysis of correlation between PQ variables is required to determine the power loss on the distribution line of buildings. Using data of PQ variables recorded by Fluke Power Analyzer 435 series II, the energy losses of the distribution line without/with PQ improvement for each building is calculated. Analysis results have shown that the reduction potential is proportional to the value of PQ variables. Administrative faculty building with poor power quality has the potential to reduce its energy losses on the distribution line by 52.62% through power quality improvement. Civil engineering building group with quite good power quality only has the potential to reduce energy losses by 32.81%. Overall, the buildings in this faculty have the potential to reduce energy losses on distribution lines by 34.42% through its power quality improvement.