Multilevel-Clamped Multilevel Converters (MLC<formula formulatype="inline"> <tex Notation="TeX">$^2$</tex> </formula>)

Abstract

This letter introduces a new series of multilevel (ML) converters based on the ML clamping concept. By applying this technique, a ML clamping unit (MCU) conveys additional levels for synthesizing the output waveforms of a diode-clamped ML dcac power converter. The basic building block of the ML clamping scheme is the ML clamping cell, which is composed of a pair of dc sources associated with one single-pole/triple-throw type of switch arrangement. The number of series-connected ML-clamping cells will set the number of levels of the synthesized waveform. By depending on the MCU arrangements, different converter configurations can be derived, namely, the common clamping and the modular types. Both approaches can be accomplished by employing classical three-level neutral-point-clamped (NPC) technology. Thus, the overall structure of the resultant converter is kept simple, wherein the number of parts count can be reduced, when compared with conventional NPC counterparts. In this letter, emphasis is given on the common clamping converter configuration. The attractiveness of the proposed ML concept is evidenced by conducting a comparative cost analysis. Experimental results are presented as a practicality proof of the proposed ML power converter.Index Terms-DC-AC power conversion, multilevel (ML) systems, power electronics.

Improving the Accuracy of the Output Voltage of the Converter by Changing the Load Parameters

“…Чимало перетворювачів [9,10], що забезпечують змінну напругу спеціальної форми [11], живлять навантаження, параметри якого під час роботи змінюються. Визначення прийомів підвищення точності формування вихідної напруги за умови зміни параметрів навантаження розглянемо на прикладі системи для збудження магнітних моментів атомів речовини, що досліджується.…”

Sequential Selective Harmonic Elimination and Outphasing Amplitude Control for the Modular Multilevel Converters Operating with the Fundamental Frequency

“…High-efficiency switch-mode modules, used to synthesize sinusoidal output voltage, may operate at the fundamental frequency of the sine voltage, required for the load, or at higher frequencies (the carrier frequency) using the pulse-width modulation to reduce higher harmonics of the fundamental frequency. In the last case, the output filters, required for reducing total harmonic distortion (THD) of the output voltage to the acceptable level, are significantly smaller [1][2][3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20].…”

Module Multilevel-Clamped Composited Multilevel Converter (M-MC2) with Dual T-Type Modules and One Diode Module

“…MODULAR MULTILEVEL-CLAMPED COMPOSITED MULTILEVEL CONVERTER (M-MC 2 ) CONCEPT Fig. 2 shows the multilevel-clamped multilevel converters (MLC 2 ) proposed in [14]. The MLC 2 solution is different from the conventional multilevel generation law; a set of multilevel clamping units (MCU) is connected to one multilevel output unit (MOU) in the main power converter.…”