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Switching Characterization of Cascaded Multilevel-Inverter-Controlled Systems
- Source :
- IEEE Transactions on Industrial Electronics
- Publication Year :
- 2008
- Publisher :
- Institute of Electrical and Electronics Engineers (IEEE), 2008.
-
Abstract
- In this paper, the method of triangular carrier switching control of two-level inverters is extended to cascaded multilevel inverters using phase-shifted multicarrier unipolar pulsewidth modulation (PWM). The condition for smooth modulation is obtained using the Bessel's function representation of the PWM output and the switching condition of the multilevel-inverter-controlled system. A method is proposed for the determination of the minimum amplitude of the triangular carrier for smooth modulation at fixed switching frequency. It is shown that the multilevel modulation based on the phase-shifted carriers significantly reduces the ripple magnitude in the switching function and allows the use of a smaller carrier amplitude under closed loop. This increases the forward gain and, hence, improves the tracking characteristics. The proposed cascaded multilevel inverter control is implemented for the operation of a distribution static compensator (DSTATCOM) in the voltage control mode. The experimental verification of the theoretical and simulation results is provided through a field-programmable gate array (FPGA) based control of a laboratory model of a single-phase DSTATCOM.
- Subjects :
- Bessel's function, carrier amplitude, cascaded multilevel inverter, distribution static compensator (DSTATCOM), switching control
Ripple
090607 Power and Energy Systems Engineering (excl. Renewable Power)
Amplitude modulation
Amplitude
Control and Systems Engineering
Modulation
Control theory
Gate array
Electrical and Electronic Engineering
Field-programmable gate array
Phase modulation
Pulse-width modulation
Mathematics
Subjects
Details
- ISSN :
- 02780046
- Volume :
- 55
- Database :
- OpenAIRE
- Journal :
- IEEE Transactions on Industrial Electronics
- Accession number :
- edsair.doi.dedup.....1a3d002a59131c5eed37ac97d0da6d58