Pub Date : 2021-10-28DOI: 10.1109/iseee53383.2021.9628488
Marius Solomon, M. Gaiceanu
The high-performance length cutting lines of the strip use the Flying Shear, a mechanism that is moved by a vector controlled three-phase asynchronous motor. The operating principle of the cutting line involves a complex dynamic regime, continuous cutting of the strip in sheet at a maximum speed of 45 meters per minute (mpm), where the entire mechanism of the flying shear are moving backward and forward to perform the cut and return to zero point position. Due to the frequents reversing process, the objective of this paper is to optimize the dynamic regimes of the process in order to minimize the energy consumption. From the hierarchical control architecture, the induction motor control is performed at the First Level, where the PLC device sets the direction of movement and the speed value reference, and a Simotion Drives (D425) transforms the PLC's sets into electrical AC voltage signals settings that supply the motor. The complex dynamic operating mode of the motor is given by cutting sequence process: the normal cutting sequence at constant line speed, to which is added the continuous speed changes required by the human operator or the line speed deceleration regime in the event of stop or breakdown conditions.
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Pub Date : 2021-10-28DOI: 10.1109/iseee53383.2021.9628654
Fırat Bilgin, M. Alci
L. Zadeh came up with the idea of Z-number to reflect human decision-making ability in environments where information is uncertain. According to his idea, a Z-number consists of a classical fuzzy part and its reliability. Although there are linguistic based studies exist in the literature, designing the reliability part is still an open issue. In this paper, Logistic Regression is used to determine reliability part. Since the reliability part contains probability information and fuzzy granular information, both statistical and probability based methods must be proposed. The features such as giving probabilistic output, being optimization based via a cost function makes the Logistic Regression one of the best methods for generating Z-number. According to the proposed method, Z-numbers and Z-number based fuzzy if-then rules are written. We tried the Z-number based classifier on Fisher Iris Dataset. The results showed us the more reliable fuzzy membership functions give the more accurate outputs as expected. Another important issue is the reliability of input information, i.e. sensor data, was not known, so the reliability based calculations could not be performed. The reliability of input data can be calculated via proposed method.
L. Zadeh提出了z数的概念来反映人类在信息不确定的环境下的决策能力。根据他的思想，一个z数由一个经典模糊部分和它的可靠性组成。虽然文献中已有基于语言学的研究，但信度部分的设计仍然是一个悬而未决的问题。本文采用Logistic回归方法确定可靠性部分。由于可靠性部分包含概率信息和模糊颗粒信息，因此必须同时提出基于统计和基于概率的方法。诸如给出概率输出，通过成本函数进行优化等特征使逻辑回归成为生成z数的最佳方法之一。根据提出的方法，编写了z数和基于z数的模糊if-then规则。我们在Fisher Iris Dataset上尝试了基于z数的分类器。结果表明，模糊隶属函数越可靠，输出结果越准确。另一个重要问题是输入信息(即传感器数据)的可靠性未知，因此无法进行基于可靠性的计算。该方法可以计算输入数据的可靠性。
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Pub Date : 2021-10-28DOI: 10.1109/iseee53383.2021.9628558
Dache Cristinel, S. Epure, Alexandru Dușa, R. Șolea, M. Gaiceanu, Constantin Drogeanu
Energy quality is an important factor today. To improve it, by reducing the disturbances and the deforming regime created by nonlinear loads, the best method is that of active filtration. In this paper is studied experimentally, the effect it can produce on the filtration process, the connection of the filter coils (with separate or common magnetic core) within an active prototype hybrid power filter.
{"title":"The influence of the type of connection of the filter coils on the efficiency of the filtration process","authors":"Dache Cristinel, S. Epure, Alexandru Dușa, R. Șolea, M. Gaiceanu, Constantin Drogeanu","doi":"10.1109/iseee53383.2021.9628558","DOIUrl":"https://doi.org/10.1109/iseee53383.2021.9628558","url":null,"abstract":"Energy quality is an important factor today. To improve it, by reducing the disturbances and the deforming regime created by nonlinear loads, the best method is that of active filtration. In this paper is studied experimentally, the effect it can produce on the filtration process, the connection of the filter coils (with separate or common magnetic core) within an active prototype hybrid power filter.","PeriodicalId":299873,"journal":{"name":"2021 7th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126294230","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
Pub Date : 2021-10-28DOI: 10.1109/iseee53383.2021.9628670
E. Cazacu, M. Barbu, L. Petrescu
The work suggests a synchronous instigation of two transients: inrush current and ferroresonance. These could occur in actual low-voltage networks at the switching moment of different devices with iron-cores (e.g. light loaded transformers). Correspondingly, a time-domain investigation is carried-out by adopting a circuit-model for the transformer and by solving the corresponding differential equations, which describe the inrush current and ferroresonance transient and stationary phenomena. The core magnetic properties of the transformer are adequately modelled by a descriptive relation that properly covers the device saturation area. Thus, the time evolution of the circuit is predicted instantly after the energizing process and the major features of these power quality issues are critically examined. Supplementary, some mitigation technique of both phenomena detrimental consequences on the network are also proposed. The entire analysis is illustrated on toroidal transformer with a rated power of 500 VA often encountered in low-voltage installations.
{"title":"Inrush current and ferroresonance in low-voltage networks - An integral approach","authors":"E. Cazacu, M. Barbu, L. Petrescu","doi":"10.1109/iseee53383.2021.9628670","DOIUrl":"https://doi.org/10.1109/iseee53383.2021.9628670","url":null,"abstract":"The work suggests a synchronous instigation of two transients: inrush current and ferroresonance. These could occur in actual low-voltage networks at the switching moment of different devices with iron-cores (e.g. light loaded transformers). Correspondingly, a time-domain investigation is carried-out by adopting a circuit-model for the transformer and by solving the corresponding differential equations, which describe the inrush current and ferroresonance transient and stationary phenomena. The core magnetic properties of the transformer are adequately modelled by a descriptive relation that properly covers the device saturation area. Thus, the time evolution of the circuit is predicted instantly after the energizing process and the major features of these power quality issues are critically examined. Supplementary, some mitigation technique of both phenomena detrimental consequences on the network are also proposed. The entire analysis is illustrated on toroidal transformer with a rated power of 500 VA often encountered in low-voltage installations.","PeriodicalId":299873,"journal":{"name":"2021 7th International Symposium on Electrical and Electronics Engineering (ISEEE)","volume":"37 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-10-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130922334","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}
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