TY - JOUR
T1 - Optimal variable switching frequency scheme for reducing switching loss in single-phase inverters based on time-domain ripple analysis
AU - Mao, Xiaolin
AU - Ayyanar, Raja
AU - Krishnamurthy, Harish K.
N1 - Funding Information:
Manuscript received August 06, 2008; revised October 30, 2008. First published January 23, 2009; current version published nulldate. This work was supported in part by BP Solar and the Department of Energy under the Solar America Initiative Program, and by the Office of Naval Research under Grant N00014-05-1-0622. Recommended for publication by Associate Editor D. Xu.
PY - 2009
Y1 - 2009
N2 - The choice of switching frequency for pulsewidth modulation single-phase inverters, such as those used in grid-connected photovoltaic application, is usually a tradeoff between reducing the total harmonic distortion (THD) and reducing the switching loss. This paper discusses an approach to minimize the switching loss while meeting a given THD requirement using variable switching frequency schemes (switching schemes with the switching frequency varying within a fundamental period). An optimal switching scheme is proposed based on time-domain current ripple analysis and the calculus of variations. The analysis shows that, to meet the same THD requirement, the optimal scheme has a significant saving on switching loss, compared to the fixed switching frequency scheme and the hysteresis control scheme, in addition to other benefits such as reduced peak switching loss and a spread spectrum of the current harmonics. The optimal scheme has been implemented in a prototype and the experimental results have verified the theoretical analysis. Also, a straightforward design method for designing filter inductors for single-phase converters is provided based on the time-domain current ripple analysis.
AB - The choice of switching frequency for pulsewidth modulation single-phase inverters, such as those used in grid-connected photovoltaic application, is usually a tradeoff between reducing the total harmonic distortion (THD) and reducing the switching loss. This paper discusses an approach to minimize the switching loss while meeting a given THD requirement using variable switching frequency schemes (switching schemes with the switching frequency varying within a fundamental period). An optimal switching scheme is proposed based on time-domain current ripple analysis and the calculus of variations. The analysis shows that, to meet the same THD requirement, the optimal scheme has a significant saving on switching loss, compared to the fixed switching frequency scheme and the hysteresis control scheme, in addition to other benefits such as reduced peak switching loss and a spread spectrum of the current harmonics. The optimal scheme has been implemented in a prototype and the experimental results have verified the theoretical analysis. Also, a straightforward design method for designing filter inductors for single-phase converters is provided based on the time-domain current ripple analysis.
KW - Calculus of variations
KW - Photovoltaic (PV)
KW - Pulsewidth modulation (PWM)
KW - Single-phase converter
KW - Switching loss
KW - Variable switching frequency
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U2 - 10.1109/TPEL.2008.2009635
DO - 10.1109/TPEL.2008.2009635
M3 - Article
AN - SCOPUS:67349177767
SN - 0885-8993
VL - 24
SP - 991
EP - 1001
JO - IEEE Transactions on Power Electronics
JF - IEEE Transactions on Power Electronics
IS - 4
ER -