TY - JOUR
T1 - Magnetic Integration for Parallel Interleaved VSCs Connected in a Whiffletree Configuration
AU - Gohil, Ghanshyamsinh Vijaysinh
AU - Bede, Lorand
AU - Teodorescu, Remus
AU - Kerekes, Tamas
AU - Blaabjerg, Frede
PY - 2016/11
Y1 - 2016/11
N2 - The Voltage Source Converters (VSCs) are often connected in parallel to realize a high current rating. In such systems, the harmonic quality of the output voltage can be improved by interleaving the carrier signals of the parallel VSCs. However, an additional inductive filter is often required to suppress the circulating current that flows between the parallel interleaved VSCs. One of the ways to deal with the circulating current problem is to use the coupled inductors in a whiffletree configuration. This paper proposes the integration of the line filter inductor and the circulating current filter inductor in a single magnetic component for such systems. The fundamental frequency component of the flux is mostly confined to the limbs around which the coils are placed, whereas other parts of the magnetic structure only experiences high frequency flux excitation. As a result, the integrated inductor can be made smaller and the power density of the overall converter system can be increased. The magnetic structure of the integrated inductor is analyzed and performance is verified by simulation and experimental studies.
AB - The Voltage Source Converters (VSCs) are often connected in parallel to realize a high current rating. In such systems, the harmonic quality of the output voltage can be improved by interleaving the carrier signals of the parallel VSCs. However, an additional inductive filter is often required to suppress the circulating current that flows between the parallel interleaved VSCs. One of the ways to deal with the circulating current problem is to use the coupled inductors in a whiffletree configuration. This paper proposes the integration of the line filter inductor and the circulating current filter inductor in a single magnetic component for such systems. The fundamental frequency component of the flux is mostly confined to the limbs around which the coils are placed, whereas other parts of the magnetic structure only experiences high frequency flux excitation. As a result, the integrated inductor can be made smaller and the power density of the overall converter system can be increased. The magnetic structure of the integrated inductor is analyzed and performance is verified by simulation and experimental studies.
KW - Parallel inverters
KW - Integrated inductor
KW - Wind energy conversion system
KW - Harmonic filter design
KW - Harmonic filter
KW - Parallel interleaved inverters
KW - Parallel interleaved converters
KW - Optimized filter design
KW - High power converters
KW - Phase-shifted carrier-based pulsewidth modulation (PSC-PWM)
KW - Circulating current
KW - Circulating current suppression
KW - Coupled inductor
KW - Inter phase transformer
KW - Inter cell transformer
U2 - 10.1109/TPEL.2015.2514182
DO - 10.1109/TPEL.2015.2514182
M3 - Journal article
SN - 0885-8993
VL - 31
SP - 7797
EP - 7808
JO - I E E E Transactions on Power Electronics
JF - I E E E Transactions on Power Electronics
IS - 11
ER -