Journal
IEEE TRANSACTIONS ON ENERGY CONVERSION
Volume 37, Issue 3, Pages 1789-1802Publisher
IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
DOI: 10.1109/TEC.2022.3140232
Keywords
Topology; Switches; Capacitors; High frequency; Voltage; Pulse width modulation; Voltage control; Multilevel inverter (MLI); Dual input nine-level inverter (DINLI); Phase disposition pulse width modulation (PDPWM); Total harmonic distortion (THD); Electromagnetic interference (EMI)
Funding
- Advanced Power and Energy Center (APEC) at Khalifa University, Abu Dhabi, UAE
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This paper introduces a novel dual input nine-level inverter (DINLI) topology, which generates high-quality output and improves overall system efficiency through appropriate modification of the phase disposition pulse width modulation technique.
This paper proposes a novel dual input nine-level inverter (DINLI) topology which requires only seven controllable devices. The dual inputs are un-identical DC voltage sources in the ratio 1:3. A simple control scheme is derived by appropriately modifying the phase disposition pulse width modulation technique to generate high-quality 9-level output from the DINLI topology. At any given instant, a maximum of four switches conduct out of which only a maximum of two switches operate at high frequency, bringing down the switching and conduction losses significantly and improving the overall system efficiency. The bidirectional DINLI (BDINLI) topology with reactive power capability can be realized by replacing the unidirectional devices with the controlled switches (i.e., total nine switches). In addition, the proposed DINLI topology does not require extra voltage balancing circuits which further improves the efficiency. The DINLI operation is verified through MATLAB simulations for grid-connected applications and its extension to an n-level, 3-phase application is also investigated. Experiments performed on a 1KVA laboratory prototype to validate the theoretical claims.
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