The study of five-level inverters with the various PWM
The energy indicators of multilevel voltage converters are analyzed. The relevance of the research is indicated by the increasing demands of technological processes for the economic use of electric energy, the reduction in power consumed by semiconductor converters, and also to the level of regulated reactive power. The converter considered is a five-level voltage inverter. As the topology of the converter, the structure of the inverter on H-bridges is considered. The article presents two-stage three-phase circuits with the connection of inverter cells to wye. Possible states of electronic keys and their corresponding operating modes are described. The voltage of constant voltage sources is 535 V. In the article algorithms for the formation of pulse-width modulation (PWM) are considered: Phase Opposition Disposition, Alternative Phase Opposition Disposition and Hybrid methods with zero sequence sinusoidal shape of the modulate voltage or with triangular shape of the modulate voltage. As a criterion for evaluating the quality of the inverter's output voltage, total harmonic distortion and line-to-line voltage were adopted. A harmonic voltage spectrum is developed for various control methods of the converter. Possible ways of reducing the harmonic coefficient, as well as increasing the amplitude modulation factor, are shown, by using various methods of forming the pulse-width modulation.
Modeling and Analysis of a Novel Boost Derived Multilevel Hybrid Converter
Abstract Multilevel inverters (MLI) offer high power capability connected with lower output harmonics and lower conduction and switching losses. Conventional cascaded H-bridge (CHB) MLI produces AC output which can be employed for a single load. But for smart residential nanogrid applications, dual load (AC and DC) is required concurrently. This paper has introduced a new topology of boost derived multilevel hybrid converter (BDMHC) which produces multilevel AC and DC output simultaneously. Thus the converter required the lesser number of switches to supply both AC and DC load. This proposed topology of BDMHC is constituted one H-bridge seven-level symmetrical MLI with three separate boost converters. State space mathematical model has been developed for the proposed converter and validated with simulated circuit using MATLAB/Simulink.
Chemical Metallurgy: Principles and Practice
Foreword. Preface. Acknowledgements. Appreciation. 1. Acquaintance. 2. Mineral Processing. 3. Thermodynamics and Kinetics. 4. Pyrometallurgy. 5. Hydrometallurgy. 6. Electrometallurgy. 7. Energy and Environment. Subject Index.