Compensador série de tensão em onda quadrada para mitigação de afundamentos de tensão

Abstract

Series Voltage Compensators (SVC) are used to mitigate power quality problems related to voltage distortion issues. The most known SVC are the DVR TM (Dynamic Voltage Restorer) and DySC TM (Dynamic Sag Corrector), which are used to protect sensitive loads. The voltage injected by the DVR is sinusoidal, produced by an H-bridge inverter which is modulated using Pulse Width Modulation (PWM) and a sinusoidal output filter. Considering that voltage sags are fast phenomena that usually last hundreds of milliseconds, this paper proposes the use of square-wave voltages to compensate sags as well as the control strategy for the compensator. Experimental results show the effectiveness of the injection of a square-wave voltage for the protection of electronic loads.

Industry 4.0 for Steel Construction: an Outlook

“…The first attempts for building automation date back to the 1970s when robots were used to increase the quality and productivity in prefabrication of modular homes in Japan [7]. Since then, there were numerous developments by industry and academia aiming at the improvement of the productivity in both on-and off-site activities, covering several types of single-task robots [8] such as bricklaying [9], installation of finishes [3], façade cleaning, installation of steel beams [10], large scale prefabrication automation for modular construction [11], [12]. Attempts to optimize tasks on the construction site were done as well.…”

“…In what concerns automation, it usually relates to repetitive tasks executed by machines or robots; that is why, for example, the automotive industry has benefitted greatly from automating several tasks in the production process [3], [4]. However, automotive production is also an example of very structured and well-organized process because it produces the same product thousands of times, while this is not the case of the construction sector.…”

Modelagem no domínio da frequência de um regulador eletromagnético de tensão baseado na compensação série

“…Tais recursos, caso desejado, podem ainda viabilizar a compensação de forma independente por fase, contribuindo, concomitantemente, para o equilíbrio do suprimento de energia. Dentro dessa linha de dispositivos, ressaltam-se as tecnologias comercialmente conhecidas por DVR, SIPCON S, TSSC, SSSC, Softswitching DySC, dentre outros [10], [11], [12], [13], [14], [15], [16], [17], [18] e [19].…”