Browsing by Keyword "optimization algorithms"
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Item (2N+1) Selective Harmonic Elimination-PWM for Modular Multilevel Converters: A Generalized Formulation and A Circulating Current Control Method(2018-01) Pérez-Basante, Angel; Ceballos, Salvador; Konstantinou, Georgios; Pou, Josep; Andreu, Jon; De Alegría, Iñigo Martínez; POWER ELECTRONICS AND SYSTEM EQUIPMENTThe performance of modular multilevel converters (MMCs) in medium-voltage applications, where the number of required submodules is not high, can be improved utilizing low switching frequency modulations such as (2N+1) selective harmonic elimination-pulse width modulation (SHE-PWM), which provides tight control of lower order harmonics and low switching losses. This paper proposes a calculation method, which is based on a novel formulation, to solve the SHE-PWM problem. In particular, MMCs with (2N+1) phase output voltage levels are considered, obtaining a (2N+1) SHE-PWM waveform. This method utilizes a unique system of equations that is valid for any possible waveform. Therefore, it is able to calculate simultaneously, without predefined waveforms, both the switching patterns and the associated firing angles that solve the (2N+1) SHE-PWM problem. Consequently, the search process is simplified and optimized. Furthermore, this paper also proposes a circulating current control technique, which can be applied along with (2N+1) SHE-PWM without disturbing the phase output voltage. Simulation results and experimental tests obtained with a single-phase laboratory prototype prove the validity of the novel (2N+1) SHE-PWM implementation method and the proposed circulating current control technique.Item Piacere: Programming trustworthy infrastructure as code in a secure framework(2021) Alonso, Juncal; Joubert, Christophe; Orue-Echevarria, Leire; Pradella, Matteo; Vladušič, Daniel; HPA; Tecnalia Research & InnovationInfrastructure-as-Code (IaC), enables the automation of several deployment, configuration and management tasks. IaC has a lot of potential in cloud computing as it results in a significant saving of time when an application needs to be redeployed on a different set of resources, even running on different infrastructures. Unfortunately, IaC still suffers from some important issues, such as the large variety of competing tools or the strong orientation toward the cloud, leaving aside e.g. the edge. Also, trustworthiness and security aspects of are often left for the end of the cycle, where errors and vulnerabilities are often too late or too expensive to correct. We present here the PIACERE project, which provides tools, methods and techniques for the Infrastructure-as-Code approach. The project will make the creation of IaC more accessible to designers, developers and operators, increasing the quality, security, trustworthiness and evolvability of infrastructural code while ensuring its business continuity by providing self-healing mechanisms anticipation of failures and violations.