Zbigniew Fedyczak, Leszek Frąckowiak and Maciej Jankowski
Aims to focus on steady state and transient state analysis of basic properties of new solution for a single‐phase serial AC voltage controller. Furthermore, simulation and…
Abstract
Purpose
Aims to focus on steady state and transient state analysis of basic properties of new solution for a single‐phase serial AC voltage controller. Furthermore, simulation and experimental test results of 3 kVA models are provided to confirm and verify the theoretical approach.
Design/methodology/approach
Presents a converter with auxiliary transformer and bipolar PWM AC matrix‐reactance chopper (MRC), based on Ćuk B2 topology. The MRC has the possibility of bipolar AC voltage conversion with magnitude of voltage transformation function greater than 1. The peak voltage detection method in the control circuit is applied to fast control of the load voltage changes. The steady state and transient state theoretical analysis based on averaged models of the presented controller is used. There is a four‐terminal description of the basic properties in the presented approach.
Findings
In the proposed solution only half the number of switches compared with the case of full bridge matrix chopper solution is used. The nominal load voltage can be obtained even for 50 per cent step‐down of the supply voltage.
Originality/value
Presents new topology and properties of single‐phase serial AC voltage controller.
Details
Keywords
Although there are many journalistic accounts of ongoing political events narrating about pro-democratic or antiauthoritarian movements, such as strikes, riots, and protest…
Abstract
Although there are many journalistic accounts of ongoing political events narrating about pro-democratic or antiauthoritarian movements, such as strikes, riots, and protest letters, not many scholarly analyses devote attention to the longitudinal analysis of the preceding events that lead to a spur of protests. Not many scholars account or are able to account for the activity of political dissidents that is often hidden, purposely censored, and covered from public eye. Most frequently, until the street strike and riots, the degree of spread of dissident activity within a country is unknown to scholars. It is equally difficult to find information about the national and international networks that political activists form to gain support and acceptance of their acclamations, propositions, and calls for political or economic reforms. Furthermore, only access to dissident press allows researchers to glimpse the activity of existing organizations looking at issues censored by existing governments.