DOI:10.1007/s40565-018-0391-7 |
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Highly efficient three-phase grid-connected parallel inverter system |
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Net amount: 717 |
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Author:
Evren ISEN1, Ahmet Faruk BAKAN2
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Author Affiliation:
1.Department of Electrical and Electronics Engineering, Kirklareli University, Kirklareli, Turkey;
2.Department of Electrical Engineering, Yildiz Technical University, Istanbul, Turkey
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Foundation: |
This work was supported by The Scientific and
Technological Research Council of Turkey (TUBITAK) (No.
110E212). |
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Abstract: |
In this paper, a new three-phase grid-connected
inverter system is proposed. The proposed system includes
two inverters. The main inverter, which operates at a low
switching frequency, transfers active power to the grid. The
auxiliary inverter processes a very low power to compensate
for the grid current ripple. Thus, no active power is
processed by the auxiliary inverter. The goal is to produce
a grid current with a low total harmonic distortion (THD)
and to obtain the highest efficiency from the inverter system.
The main inverter is controlled via a space-vector
pulse-width modulation owing to its optimum switching
pattern, and the auxiliary inverter is controlled via a hysteresis
current-control technique owing to the technique’s
fast dynamic response. The proposed system is analyzed in
terms of different DC-link voltage, switching frequency,
and filter inductance values. The optimum system parameters
are selected that provide a THD value of less than 5%.
A prototype inverter system at a 10-kW output power has
been implemented. The main inverter operates at a 3-kHz
switching frequency, and the auxiliary inverter compensates
for the grid-current ripple. In total, a THD of 4.33%
and an efficiency of 97.86% are obtained using the proposed
inverter system prototype. |
Keywords: |
Active filter, Inverter efficiency, Ripple
cancellation, Three-phase grid-connected inverter |
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Online Time:2018/09/22 |
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