Comparison of voltage vector control in various forms of tetrahedron that result from switching combination on three-phase four-leg system active filter is presented especially asymmetric tetrahedron shape which is a projection pqr-coordinate into αβ0-coordinate. Parameter tetrahedrons such as modulation boundary-line, reference vector, switching duration time and duty cycle are described. Duty cycle analysis conducted on the Shen’s model, the Zhang’s model, the Perales’s model and asymmetric’s model are presented. The characteristics results showed that switching combination of each IGBT conductor especially its reviews on the neutral wire. Asymmetric tetrahedron can be proposed as control technique in three-phase four-leg system active filter.
Comparison of voltage vector control in various forms of tetrahedron that result from switching combination on three-phase four-leg system active filter is presented especially asymmetric tetrahedron shape which is a projection pqr-coordinate into αβ0-coordinate. Parameter tetrahedrons such as modulation boundary-line, reference vector, switching duration time and duty cycle are described. Duty cycle analysis conducted on the Shen’s model, the Zhang’s model, the Perales’s model and asymmetric’s model are presented. The characteristics results showed that switching combination of each IGBT conductor especially its reviews on the neutral wire. Asymmetric tetrahedron can be proposed as control technique in three-phase four-leg system active filter.
Arus sumber tiga fasa sinusoida bila terhubung dengan beban nonlinier akanmengalami distorsi yang disebabkan oleh arus frekuensi tinggi. Untukmenghilangkan distorsi dapat digunakan filter aktif sistem tiga fasa denganteknik modulasi dan kendali proportional integral (PI). Dari teknik modulasidan kombinasi kendali PItersebut akan dihasilkan arus kompensasi yangmemiliki amplitudo sama dan polaritas kebalikan dengan arus bebanterdistorsi sehingga arus sumber dapat dibuat kembali sinusoida. Simulasidapat dilakukan dengan pembebanan nonlinier berupa penyearah dioda danrangkaian RL, RC dan RLE.
Anelectric current flow on the neutral wire give raise to harmonics. It is a problem that must be solved one of which is space vector modulation technique. A few voltage vector models have been developed including by Zhang and Perales. In this paper the models are compared to determine reference voltage vector and duty cycle, developed asymmetric’s model based on Akagi theory too. The results show that asymmetric’s model can be proposed as a new technique in space vector modulation.Arus yang mengalir pada kawat netral menimbulkan harmonisa. Hal itu merupakan masalah yang harus diselesaikan salah satunya adalah dengan teknik modulasi vektor ruang. Beberapa model vektor tegangan telah dikembangkan diantaranya oleh Zhang dan Perales. Dalam tulisan ini dibandingkan model-model tersebut dalam menentukan vektor-tegangan referensi dan duty cycle. Dikembangkan pula model asimetri yang berdasarkan pada teori Akagi. Hasilnya menunjukkan bahwa model asimetri dapat diusulkan sebagai satu teknik baru dalam modulasi vektor ruang.
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