A COMBINED DC-FILTER AND OPTIMIZED MODULATION TO ABSORB DC-LINK OSCILLATIONS OF CASCADED H-BRIDGE CONVERTERS

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TAVAKOLI BINA M.; ESKANDARI B.

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Journal: Journal of Control Year:2009 | Volume:3 | Issue:1 Page(s): 1-11

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Title

A COMBINED DC-FILTER AND OPTIMIZED MODULATION TO ABSORB DC-LINK OSCILLATIONS OF CASCADED H-BRIDGE CONVERTERS

Author(s)

TAVAKOLI BINA M. | ESKANDARI B. | Issue Writer Certificate

Keywords

CASCADED CONVERTERQ2

DC-LINK OSCILLATIONQ3

BALANCED AC VOLTAGESQ3

OPTIMAL-PWMQ2

SPWMQ2

Abstract

Cascaded H-bridge converters may well be used for applications requiring higher voltages, without needing series connection of semiconductor switches. Two problems are necessary to be addressed; first, the AC voltages of the sub-modules of the CASCADED CONVERTER which are unequal due to the deployed modulation technique, thus introducing different fundamental components and harmonic contents. Second, is the DC-links of sub-modules that are subjected to low-frequency oscillations when operating under three-phase unbalance condition and/or single-phase active power exchange. This paper begins with the first problem, suggesting a generalized swapping technique for a cascaded H-bridge converter. This is applied to the SPWM and the optimal PWM, while the optimal PWM is suggested to be subjected to a complementary constraint. A five level H-bridge CASCADED CONVERTER is developed to implement the suggested modulations. Practical results confirm that AC voltages of the sub-modules are equalized. Furthermore, three various external DC active filter circuits are presented to tackle the second problem, including the independent DC source, the auxiliary S-bridge and the buck-boost design. These circuits are simulated, and their performances are compared. Moreover, the buck-boost design is implemented, and applied to the DC output of a single-phase full-bridge rectifier. Then, three control strategies are further tested on the buck-boost compensating circuit. Experimental results show that the effective value of the DC ripples is considerably lowered down in comparison with the original DC oscillation.

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APA: Copy

TAVAKOLI BINA, M., & ESKANDARI, B.. (2009). A COMBINED DC-FILTER AND OPTIMIZED MODULATION TO ABSORB DC-LINK OSCILLATIONS OF CASCADED H-BRIDGE CONVERTERS. JOURNAL OF CONTROL, 3(1), 1-11. SID. https://sid.ir/paper/120911/en

Vancouver: Copy

TAVAKOLI BINA M., ESKANDARI B.. A COMBINED DC-FILTER AND OPTIMIZED MODULATION TO ABSORB DC-LINK OSCILLATIONS OF CASCADED H-BRIDGE CONVERTERS. JOURNAL OF CONTROL[Internet]. 2009;3(1):1-11. Available from: https://sid.ir/paper/120911/en

IEEE: Copy

M. TAVAKOLI BINA, and B. ESKANDARI, “A COMBINED DC-FILTER AND OPTIMIZED MODULATION TO ABSORB DC-LINK OSCILLATIONS OF CASCADED H-BRIDGE CONVERTERS,” JOURNAL OF CONTROL, vol. 3, no. 1, pp. 1–11, 2009, [Online]. Available: https://sid.ir/paper/120911/en

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