Journal of Electrical Engineering and Information Technologies最新文献

ACTIVE ELECTRICITY METERS ERROR ANALYSIS IN CASE OF HARMONICALLY DISTORTED VOLTAGES AND CURRENTS 有源电能表谐波畸变电压电流误差分析

Journal of Electrical Engineering and Information Technologies Pub Date : 2021-06-25 DOI: 10.51466/jeeit2161183029d

Kiril Demerdziev, V. Dimcev, M. Cundeva-Blajer, Z. Kokolanski, M. Srbinovska

{"title":"ACTIVE ELECTRICITY METERS ERROR ANALYSIS IN CASE OF HARMONICALLY DISTORTED VOLTAGES AND CURRENTS","authors":"Kiril Demerdziev, V. Dimcev, M. Cundeva-Blajer, Z. Kokolanski, M. Srbinovska","doi":"10.51466/jeeit2161183029d","DOIUrl":"https://doi.org/10.51466/jeeit2161183029d","url":null,"abstract":"High order harmonic components in voltage and current signals are nowadays more prevalent in power grids at any voltage level, therefore demands for accurate measurements of the system’s parameters go beyond the performance of instruments under pure sine wave conditions. This topic is highly challenging, especially in domain of electricity meters intended for legal metrology purposes, i.e. for billing in the regulated trade of electrical energy. Test procedures for examination of electricity meters’ output in case of harmonically distorted signals are proposed in several international standards and recommendations. The drawbacks of the signals presented in these documents are the lack of complexity and random behavior of single harmonic component’s amplitude and phase shift. Because many types of electricity meters are used worldwide, different output is expected for instruments based on different measurement principles. For faithful presentation of meters’ errors in case of harmonics, several devices are about to be tested with random distorted signals, by using different currents and phase shifts.","PeriodicalId":312395,"journal":{"name":"Journal of Electrical Engineering and Information Technologies","volume":"4 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125144031","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}

引用次数: 0

5G NEW RADIO (5G NR) - AIR INTERFACE IN 5G MOBILE NETWORKS 5g新无线电(5g nr) - 5g移动网络中的空中接口

Journal of Electrical Engineering and Information Technologies Pub Date : 2021-06-25 DOI: 10.51466/jeeit2161184037s

Kristina Simovska, V. Atanasovski, P. Latkoski

{"title":"5G NEW RADIO (5G NR) - AIR INTERFACE IN 5G MOBILE NETWORKS","authors":"Kristina Simovska, V. Atanasovski, P. Latkoski","doi":"10.51466/jeeit2161184037s","DOIUrl":"https://doi.org/10.51466/jeeit2161184037s","url":null,"abstract":"The fifth generation of mobile networks promises a scalable platform that can effectively provide coexistence between existing services and future 5G services. 5G networks, despite connecting people, will provide interconnection and control between machines, objects and devices. In other words it is an innovation platform that can provide new services, enhance the user experience and connect new industries. The design of 5G not only focuses on improving mobile broadband, but also on providing control over services through ultra-reliable communication links with low latency and connection to massive internet services. At the heart of 5G network there is a new, unified radio interface - 5G New Radio (NR). 5G NR is part of the 3GPP standards defined in Release 15. This paper provides an overview of the specifications defined for standardization of the new generation of mobile networks, describes the key technologies that are subject for analysis about the development of 5G NR and gives a performance evaluation in order to make a comparison with the services we use today. This technology will start a new industrial revolution, providing high communication speeds, extremely low latency, reliable communication and services that have not been possible before.","PeriodicalId":312395,"journal":{"name":"Journal of Electrical Engineering and Information Technologies","volume":"317 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134282393","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}

引用次数: 0

SECURITY CONSTRAINED HYDRO-THERMAL UNIT COMMITMENT FOR DIFFERENT HYDROLOGICAL SCENARIOS USING GENETIC ALGORITHM 基于遗传算法的不同水文情景安全约束的水热机组承诺

Journal of Electrical Engineering and Information Technologies Pub Date : 2021-06-25 DOI: 10.51466/jeeit2161182015p

Borche Postolov, A. Iliev

{"title":"SECURITY CONSTRAINED HYDRO-THERMAL UNIT COMMITMENT FOR DIFFERENT HYDROLOGICAL SCENARIOS USING GENETIC ALGORITHM","authors":"Borche Postolov, A. Iliev","doi":"10.51466/jeeit2161182015p","DOIUrl":"https://doi.org/10.51466/jeeit2161182015p","url":null,"abstract":"The main objective of the Security Constrained Hydrothermal Unit Commitment (SCHTUC) is the optimal committing of the hydro and thermal units i.e., to minimize the total cost (which are very non-linear and non-convex) of thermal plants while satisfying the many hydro-thermal constraints. Such constraints, together with the nonlinear non-convex and mixed-integer objective function, make the search space extremely complex. The time of operation of the units is considered to be 24 h. To achieve this objective, a Genetic Algorithm (GA) with two new constraint handling repair mechanisms was applied. The proposed algorithm will be applied to the hydrothermal system, under different hydrological conditions, to prove i.e., confirmation of the initial hypothesis, which indicates that the total operating costs depend significantly on the hydrological conditions, i.e., the available volume of water and the inflows in the reservoirs of the hydropower plants. The proposed algorithm was applied on IEEE 30 bus system, but also tested on a benchmark system, and confirmed by comparison with other hybrid techniques such as PSO–GWO and DA-PSO. The efficiency of the proposed algorithm is established by comparing it to these two hybrid algorithms.","PeriodicalId":312395,"journal":{"name":"Journal of Electrical Engineering and Information Technologies","volume":"26 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127648066","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}

引用次数: 0

OPTIMIZATION OF HYBRID RENEWABLE ENERGY SYSTEM 混合可再生能源系统的优化

Journal of Electrical Engineering and Information Technologies Pub Date : 2021-06-25 DOI: 10.51466/jeeit2161181005np

Sofija Nikolova-Poceva

引用次数: 4

MOBILE DATA TRAFFIC ANALYSIS IN VIRTUAL PRIVATE CLOUD: A CASE-STUDY IN OPERATIONAL MOBILE NETWORK 虚拟私有云中的移动数据流量分析:以运营移动网络为例

Journal of Electrical Engineering and Information Technologies Pub Date : 2021-06-25 DOI: 10.51466/jeeit2161185049b

Ana Bogdanovska, V. Atanasovski

{"title":"MOBILE DATA TRAFFIC ANALYSIS IN VIRTUAL PRIVATE CLOUD: A CASE-STUDY IN OPERATIONAL MOBILE NETWORK","authors":"Ana Bogdanovska, V. Atanasovski","doi":"10.51466/jeeit2161185049b","DOIUrl":"https://doi.org/10.51466/jeeit2161185049b","url":null,"abstract":"Mobile data traffic analysis is quintessential for mobile telecom operators in order to improve the quality-of-service for its customers. A mobile operator is interested in the usage popularity of services as well as the temporal distribution of the service usage. This enables identification of the volume of incoming and outgoing traffic and aids the operators to design a network that can support expected user activity. The latest networking trends point in the direction of virtualized network resources, thus exhibiting more effective network usage. The design of virtual networks is strongly affected by the pattern of mobile data for certain services. Therefore, a prior and adequate knowledge of the mobile services’ popularity and their usage can significantly improve the user experience on the network. This paper provides empirical measurements and analytical modelling of mobile data traffic using data from an operational nationwide mobile network. The network utilizes the latest trends, i.e., a virtual environment and a private cloud. The paper proposes estimation parameters for the measured traffic that match the distribution of real traffic with the lowest error.","PeriodicalId":312395,"journal":{"name":"Journal of Electrical Engineering and Information Technologies","volume":"3 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2021-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125295296","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}

引用次数: 0

BIGQUERY FOR BIG DATA ANALYSIS Bigquery用于大数据分析

Journal of Electrical Engineering and Information Technologies Pub Date : 1900-01-01 DOI: 10.51466/jeeit2272198077t

Žaneta Trenčeva, A. Risteski, T. Janevski, B. Popovski

引用次数: 0

DYNAMIC TESTING OF DISTANCE PROTECTION ACCORDING TO IEC 60255-121 STANDARD 根据iec 60255-121标准进行距离保护动态测试

Journal of Electrical Engineering and Information Technologies Pub Date : 1900-01-01 DOI: 10.51466/jeeit2271191005m

D. Mahendra, M. Popov

引用次数: 0

RECOGNITION OF HANDWRITTEN LETTERS FROM THE MACEDONIAN ALPHABET USING HAUSDORFF DISTANCE 使用豪斯多夫距离识别马其顿字母的手写字母

Journal of Electrical Engineering and Information Technologies Pub Date : 1900-01-01 DOI: 10.51466/jeeit1941-2075a

Ana Atanasovska

引用次数: 0

FORECASTING DYNAMIC TOURISM DEMAND USING ARTIFICIAL NEURAL NETWORKS 基于人工神经网络的旅游需求动态预测

Journal of Electrical Engineering and Information Technologies Pub Date : 1900-01-01 DOI: 10.51466/jeeit2162187079a

Cvetko J. Andreeski, B. Petrevska

引用次数: 0

AGE DETERMINATION OF A SEDIMENT SAMPLE BY OPTICALLY STIMULATED LUMINESCENCE 用光激发发光法测定沉积物样品的年龄

Journal of Electrical Engineering and Information Technologies Pub Date : 1900-01-01 DOI: 10.51466/JEEIT2052079S

I. Sandeva

引用次数: 0