Regenerative and ride-through capability for AC drives through thyristor-based extensions of the diode front-end

Analysis of IGBT based fundamental front end regenerative motor-drive systems

“…The duration of the notch can be accurately calculated by solving for the time at i c =0, using (5). In order to obtain a closed form solution, (5) can be simplified considering the same assumption introduced in the previous subsection, sin α ≈α.…”

“…Therefore IGBT based FFE converters have replaced most of the thyristor based line regenerative converters especially at relatively low power applications and present a very strong competitor to AFE in several industrial applications especially those that don't necessitate low input current harmonics and precise DC bus voltage control. To the best of these authors knowledge, in spite of the fact that the IGBT based FFE motor-drive systems are wide spread in numerous industrial applications, they have not been fully studied and analyzed as compared to the earlier thyristor based line regenerative converters or modern AFE converters which have been extensively addressed and analyzed, [2][3][4][5][6][7][8][9][10][11][12][13][14]. Therefore, the intention of this paper is to bridge this gap in the literature by providing an in-depth study to provide a mathematical analysis to the IGBT based FFE converters, and to provide a closed form solution of the current waveforms that can be utilized in an online adaptive control algorithm to guarantee best performance and high reliability.…”

Retificador Híbrido de Alta Potência com Reduzida DHTI Utilizando Conversor Boost para Promover Alta Suportabilidade a Afundamentos de Tensão

“…Estes são definidos pela relação do filtro LC utilizado e são característicos da operação de retificadores monofásicos em modo descontínuo de condução, devido ao reduzido tamanho das indutâncias empregadas. Esta característica também pode ser observada nas referências [3], [11], [14], [15]. Deve-se destacar ainda que devido à capacidade térmica do transistor utilizado, esses elevados esforços de corrente que ocorrem durante curto intervalo de tempo não o levam à destruição.…”

Stability technique for boost converter in AC motor driving system

“…An auxiliary front-end converter (AXC) system which operates as a shunt active filter to compensate the harmonic current drawn by the rectifier when the ac drive system consumes power and utilize its boost capability to support the dc link voltage when voltage sag occurs is presented [2]. A new circuit which uses two additional SCR bridges to add regenerative and ride-through capability to a diode rectifier under the dc voltage sag condition is proposed [3]. But these methods bring more complexity and cost to the system though adding auxiliary components.…”