Abstract
Operation of nonlinear loads can cause harmonic distortion in the voltage and current waveforms that result in abnormal electrical system condition. Content THD (Total Harmonics Distortion) an excess flow can cause power quality systems become worse, thus causing the system power factor is lower. Active filter and Passive filter which aims to reduce harmonics that arise. Analysis THD simulation and measurement results in accordance with IEEE 519-2014 and analysis designing of a passive filter and active filter is right to suppress harmonic distortion. The analysis shows that the installation of active filters causes the current and voltage THD contents to comply with the standard IEEE 519-2014 standards is ?12% and 5%. The use of passive and active filters can reduce THDi content to 8.45% and 3.07%, respectively. While for THDv decreased respectively to 3.68% and 3.45% which already meet the IEEE 519-2014 standards. Power losses decreased respectively to 4.36 kW and 3.86 kW. Installation of active filters is better for reducing THD (Total Harmonics Distortion) and power losses in KA 2085 transformers.
Highlights
The analysis shows that the installation of active filters causes the current
voltage THD contents to comply with the standard IEEE 519-2014 standards is ≤12%
Installation of active filters is better for reducing THD
Summary
Salah satu permasalahan kualitas daya listrik adalah permasalahan harmonisa. Timbulnya harmonisa pada sistem tenaga listrik salah satunya ditimbulkan oleh alat–alat yang mempunyai impedansi nonlinier seperti penyearah (rectifier), pengubah frekuensi (frequency converter) dan lampu dengan pelepasan gas (gas discharge lamp). Banyaknya pengoperasian beban nonlinier pada sistem tenaga listrik telah membuat arus sistem menjadi sangat terdistorsi dengan presentase kandungan THD (Total Harmonic Distortion) yang sangat tinggi. Pengaruh harmonisa dalam sistem tenaga listrik Ada beberapa pengaruh yang menimbulkan panas lebih pada trafo ketika arus beban mengandung harmonisa yaitu rugi tembaga dan rugi arus Eddy [3]. Arus induksi yang mengalir pada kumparan dan inti besi dapat menyebabkan pemanasan berlebih pada transformator. Sedangkan beban nonlinier memberikan bentuk gelombang keluaran arus yang tidak sebanding dengan tegangan dasar, sehingga gelombang arus maupun tegangannya tidak sama dengan gelombang masukannya seperti yang diperlihatkan pada Gambar 1 [4]. Terdapat dua komponen dalam perhitungan load loss yaitu rugi-rugi tembaga (I2R) dan Eddy-Current Loss (PEC). Faktor Eddy current loss dapat dilihat pada Tabel 3 sebagai berikut
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