Improvement of quality of power distribution system using matrix converter and active filter

Author(s):  
Taiki Hasama ◽  
Takeshi Maejima ◽  
Naoki Yamamura ◽  
Muneaki Ishida
2021 ◽  
Vol 32 (6) ◽  
pp. 58
Author(s):  
Sergei Y. Shevchenko

Тoday the term «biohacking» is used in two main meanings. First, as a part of «garage science» movement, whose members experiment in home laboratories with self-created required equipment. Secondly, as the human enhancement practices aimed at improving the quality of life and the struggle for immortality. In the article, we show the integrity of these two seemingly unrelated aspects. For this purpose we use Fuller's post-truth concept, which allows us to analyze biohacking in the context of the more general processes of science democratization and the ongoing changes in the knowledge and power distribution system. The article refers to the conceptual metaphors of lions and foxes, which traditionally distinguish two types of elites. According to this division we consider biohackers as «fox strategists». Lion's conservatism implies status quo maintaining of order power/knowledge apportionment. The foxes try to change the order by questioning the «rules of the game». We demonstrate the joining of do-it-yourself ideology and «care of the self» principles by the case of biohackers interaction at the reddit.com forum, and its section dealing with transcranial direct current stimulation devices. The analysis of this case allows to identify biohackers strategies for academic science boundaries eroding, especially, science and non-science boundaries, individual scientific disciplines and «national sciences». Authors conclude that biohackers can be considered as philosophers of science. In this framework their practices of «personal science» and precedents creating represent the process of rethinking both the essence of science and its rules.


2019 ◽  
Vol 2019 ◽  
pp. 1-19 ◽  
Author(s):  
Naveed Ashraf ◽  
Tahir Izhar ◽  
Ghulam Abbas

The suggested single-phase ac-to-ac matrix converter operated with inverting and noninverting characteristics may solve the grid voltage swell and sag problem in power distribution system, respectively. It is also employed as a direct frequency changer for domestic induction heating. The output voltage is regulated through duty cycle control of high frequency direct PWM (DPWM) and indirect PWM (IDPWM) switching devices. The DPWM control switches control the switching states of IDPWM switching devices. The inverting and noninverting characteristics are achieved with low voltage stresses and hence low dv/dt across the high and low frequency-controlled switches. This reduces their voltage rating and losses. The high voltage overshoot problem in frequency step-up operation is also analyzed. The sliding mode (SM) controller is employed to solve this problem. Pulse selective approach determines the power quality of load voltage. The validity of the mathematically computed values is carried out by modelling the proposed topology in MATLAB/Simulink environment and through hardware results.


2003 ◽  
Vol 123 (11) ◽  
pp. 1351-1358 ◽  
Author(s):  
Hiroshi Yamashita ◽  
Pichai Jintakosonwit ◽  
Hideaki Fujita ◽  
Hirofumi Akagi ◽  
Junya Shinohara ◽  
...  

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