Electrical Control and Communication Engineering最新文献_第9页

Control of Electric Drives in the Best Efficiency Region of Pumping System 泵送系统最优效率区的电驱动控制

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-10-23 DOI: 10.2478/ecce-2014-0014

I. Bakman

{"title":"Control of Electric Drives in the Best Efficiency Region of Pumping System","authors":"I. Bakman","doi":"10.2478/ecce-2014-0014","DOIUrl":"https://doi.org/10.2478/ecce-2014-0014","url":null,"abstract":"Abstract The paper concentrates on improving the efficiency of the pumping system in which pumps are run by variable speed drives. The method is applicable to system consisting of several centrifugal pumps. Problems arising from running the pumps outside the optimal efficiency region are discussed. Common principles of operation and control of typical boosting pumping station are represented. Methods of regulation of productivity of the system are described. The proposed method is based on prediction of future efficiency of pumps before making adjustments of pumping system productivity. The proposed method is basing on tracking the working point of pump on efficiency graph. Monitoring the location of working point vs. efficiency graph enables to evaluate its current and future distances from the best efficiency point of the pump. Knowing the current number of running pumps it is possible to predict the location of working point after adjustment of productivity of the system. Ability to predict the increase or decrease of efficiency enables to enhance the adjustment of productivity of the system. Methods of graphical analysis of working state of the pumping system are representing topic for future research.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"6 1","pages":"26 - 31"},"PeriodicalIF":0.7,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0014","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199433","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: 8

Co-Simulation of an Inverter Fed Permanent Magnet Synchronous Machine 变频联馈永磁同步电机的联合仿真

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-10-23 DOI: 10.2478/ecce-2014-0013

G. Kiss, I. Vajda

{"title":"Co-Simulation of an Inverter Fed Permanent Magnet Synchronous Machine","authors":"G. Kiss, I. Vajda","doi":"10.2478/ecce-2014-0013","DOIUrl":"https://doi.org/10.2478/ecce-2014-0013","url":null,"abstract":"Abstract Co-simulation is a method which makes it possible to study the electric machine and its drive at once, as one system. By taking into account the actual inverter voltage waveforms in a finite element model instead of using only the fundamental, we are able to study the electrical machine's behavior in more realistic scenario. The recent increase in the use of variable speed drives justifies the research on such simulation techniques. In this paper we present the co-simulation of an inverter fed permanent magnet synchronous machine. The modelling method employs an analytical variable speed drive model and a finite element electrical machine model. By linking the analytical variable speed drive model together with a finite element model the complex simulation model enables the investigation of the electrical machine during actual operation. The methods are coupled via the results. This means that output of the finite element model serves as an input to the analytical model, and the output of the analytical model provides the input of the finite element model for a different simulation, thus enabling the finite element simulation of an inverter fed machine. The resulting speed and torque characteristics from the analytical model and the finite element model show a good agreement. The experiences with the co-simulation technique encourage further research and effort to improve the method.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"6 1","pages":"19 - 25"},"PeriodicalIF":0.7,"publicationDate":"2014-10-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199422","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: 2

Spectral Stochastic Finite Element Method for Electromagnetic Problems with Random Geometry 随机几何电磁问题的谱随机有限元方法

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-08-19 DOI: 10.2478/ecce-2014-0011

A. Lehikoinen

{"title":"Spectral Stochastic Finite Element Method for Electromagnetic Problems with Random Geometry","authors":"A. Lehikoinen","doi":"10.2478/ecce-2014-0011","DOIUrl":"https://doi.org/10.2478/ecce-2014-0011","url":null,"abstract":"Abstract In electromagnetic problems, the problem geometry may not always be exactly known. One example of such a case is a rotating machine with random-wound windings. While spectral stochastic finite element methods have been used to solve statistical electromagnetic problems such as this, their use has been mainly limited to problems with uncertainties in material parameters only. This paper presents a simple method to solve both static and time-harmonic magnetic field problems with source currents in random positions. By using an indicator function, the geometric uncertainties are effectively reduced to material uncertainties, and the problem can be solved using the established spectral stochastic procedures. The proposed method is used to solve a demonstrative single-conductor problem, and the results are compared to the Monte Carlo method. Based on these simulations, the method appears to yield accurate mean values and variances both for the vector potential and current, converging close to the results obtained by time-consuming Monte Carlo analysis. However, further study may be needed to use the method for more complicated multi-conductor problems and to reduce the sensitivity of the method on the mesh used.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"6 1","pages":"12 - 5"},"PeriodicalIF":0.7,"publicationDate":"2014-08-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0011","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199374","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: 8

Application of Simplified Neutral Point Clamped Multilevel Converter in a Small Wind Turbine 简化中性点箝位多电平变流器在小型风力发电机组中的应用

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0001

P. Mlodzikowski, A. Milczarek, M. Malinowski

{"title":"Application of Simplified Neutral Point Clamped Multilevel Converter in a Small Wind Turbine","authors":"P. Mlodzikowski, A. Milczarek, M. Malinowski","doi":"10.2478/ecce-2014-0001","DOIUrl":"https://doi.org/10.2478/ecce-2014-0001","url":null,"abstract":"Abstract In low power distributed generation systems low cost together with the energy quality requirements are a key element. It is known that quality of voltage waveforms generated from multilevel converters is better in comparison with those from two-level. Due to advancements in power electronics and microcontrollers, multilevel converters are being built with the use of integrated power modules thus this type of converters are getting more compact in size. This paper investigates performance of a derivation from the most popular multilevel topology - a neutral point clamped converter (NPC). Applying the idea for simplifying the topology by reducing the number of switches (what came from drives) this NPC converter is capable of bidirectional AC/DC/AC operation. For the AC/DC part two schemes are tested: Direct Torque Control Space Vector Modulated and Field Oriented Control but for the DC/AC part a control scheme utilizing the proportional-resonant controller was chosen. Laboratory setup was based on a permanent magnet synchronous generator with control and acquisition completed with the help of dSpace 1005 control box. Experimental verification shows that system operates properly.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"10 - 5"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0001","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69198981","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: 5

Sliding-Mode Observer for Speed and Position Sensorless Control of Linear-PMSM 线性永磁同步电机无速度位置传感器控制的滑模观测器

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0003

S. M. Kazraji, Ramin Bavili Soflayi, M. Sharifian

{"title":"Sliding-Mode Observer for Speed and Position Sensorless Control of Linear-PMSM","authors":"S. M. Kazraji, Ramin Bavili Soflayi, M. Sharifian","doi":"10.2478/ecce-2014-0003","DOIUrl":"https://doi.org/10.2478/ecce-2014-0003","url":null,"abstract":"Abstract The paper presents a sliding-mode observer that utilizes sigmoid function for speed and position sensorless control of permanent-magnet linear synchronous motor (PMLSM). In conventional sliding mode observer method there are the chattering phenomenon and the phase lag. Thus, in order to avoid the usage of the low pass filter and the phase compensator based on back EMF, in this paper a sliding mode observer with sigmoid function for detecting the back EMF in a PMLSM is designed to estimate the speed and the position of the rotor. Most of conventional sliding mode observers use sign or saturation functions which need low pass filter in order to detect back electromotive force (back EMF). In this paper a sigmoid function is used instead of discontinuous sign function to decrease undesirable chattering phenomenon. By reducing the chattering, detecting of the back EMF can be made directly from switching signal without any low pass filter. Thus the delay time in the proposed observer is eliminated because of the low pass filter. Furthermore, there is no need to compensate phase fault in position and speed estimating of linear-PMSM. Advantages of the proposed observer have been shown by simulation with MATLAB software.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"20 - 26"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0003","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199255","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: 24

Improving Speech Recognition Rate through Analysis Parameters 通过参数分析提高语音识别率

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0009

Deividas Eringis, G. Tamulevicius

{"title":"Improving Speech Recognition Rate through Analysis Parameters","authors":"Deividas Eringis, G. Tamulevicius","doi":"10.2478/ecce-2014-0009","DOIUrl":"https://doi.org/10.2478/ecce-2014-0009","url":null,"abstract":"Abstract Speech signal is redundant and non-stationary by nature. Because of vocal tract inertness these variations are not very rapid and the signal can be considered as stationary in short segments. It is presumed that in short-time magnitude spectrum the most distinct information of speech is contained. This is the main reason for speech signal analysis in frame-by-frame manner. The analyzed speech signal is segmented into overlapping segments (so-called frames) for this purpose. Segments of 15-25 ms with the overlap of 10-15 ms are used usually. In this paper we present results of our investigation of analysis window length and frame shift influence on speech recognition rate. We have analyzed three different cepstral analysis approaches for this purpose: mel frequency cepstral analysis (MFCC), linear prediction cepstral analysis (LPCC) and perceptual linear prediction cepstral analysis (PLPC). The highest speech recognition rate was obtained using 10 ms length analysis window with the frame shift varying from 7.5 to 10 ms (regardless of analysis type). The highest increase of recognition rate was 2.5 %.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"61 - 66"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0009","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199322","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: 18

Call Duration Characteristics based on Customers Location 基于客户位置的通话时长特征

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0010

Karolis Žvinys, D. Guršnys

{"title":"Call Duration Characteristics based on Customers Location","authors":"Karolis Žvinys, D. Guršnys","doi":"10.2478/ecce-2014-0010","DOIUrl":"https://doi.org/10.2478/ecce-2014-0010","url":null,"abstract":"Abstract Nowadays a lot of different researches are performed based on call duration distributions (CDD) analysis. However, the majority of studies are linked with social relationships between the people. Therefore the scarcity of information, how the call duration is associated with a user's location, is appreciable. The goal of this paper is to reveal the ties between user's voice call duration and the location of call. For this reason we analyzed more than 5 million calls from real mobile network, which were made over the base stations located in rural areas, roads, small towns, business and entertainment centers, residential districts. According to these site types CDD’s and characteristic features for call durations are given and discussed. Submitted analysis presents the users habits and behavior as a group (not an individual). The research showed that CDD’s of customers being them in different locations are not equal. It has been found that users at entertainment, business centers are tend to talk much shortly, than people being at home. Even more CDD can be distorted strongly, when machinery calls are evaluated. Hence to apply a common CDD for a whole network it is not recommended. The study also deals with specific parameters of call duration for distinguished user groups, the influence of network technology for call duration is considered.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"67 - 73"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199361","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: 2

Design of AC-DC Grid Connected Converter using Multi-Objective Optimization 基于多目标优化的交直流并网变换器设计

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0002

S. Piasecki, R. Szmurlo, M. Jasiński

{"title":"Design of AC-DC Grid Connected Converter using Multi-Objective Optimization","authors":"S. Piasecki, R. Szmurlo, M. Jasiński","doi":"10.2478/ecce-2014-0002","DOIUrl":"https://doi.org/10.2478/ecce-2014-0002","url":null,"abstract":"Abstract Power electronic circuits, in particular AC-DC converters are complex systems, many different parameters and objectives have to be taken into account during the design process. Implementation of Multi-Objective Optimization (MOO) seems to be attractive idea, which used as designer supporting tool gives possibility for better analysis of the designed system. This paper presents a short introduction to the MOO applied in the field of power electronics. Short introduction to the subject is given in section I. Then, optimization process and its elements are briefly described in section II. Design procedure with proposed optimization parameters and performance indices for AC-DC Grid Connected Converter (GCC) interfacing distributed systems is introduced in section III. Some preliminary optimization results, achieved on the basis of analytical and simulation study, are shown at each stage of designing process. Described optimization parameters and performance indices are part of developed global optimization method dedicated for ACDC GCC introduced in section IV. Described optimization method is under development and only short introduction and basic assumptions are presented. In section V laboratory prototype of high efficient and compact 14 kVA AC-DC converter is introduced. The converter is elaborated based on performed designing and optimization procedure with the use of silicon carbide (SiC) power semiconductors. Finally, the paper is summarized and concluded in section VI. In presented work theoretical research are conducted in parallel with laboratory prototyping e.g. all theoretical ideas are verified in laboratory using modern DSP microcontrollers and prototypes of the ACDC GCC.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"11 - 19"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0002","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69198990","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: 8

The Mathematical Modelling of Heat Transfer in Electrical Cables 电缆传热的数学模型

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Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0007

Andrej Bugajev, G. Jankevičiūtė, N. Tumanova

{"title":"The Mathematical Modelling of Heat Transfer in Electrical Cables","authors":"Andrej Bugajev, G. Jankevičiūtė, N. Tumanova","doi":"10.2478/ecce-2014-0007","DOIUrl":"https://doi.org/10.2478/ecce-2014-0007","url":null,"abstract":"Abstract This paper describes a mathematical modelling approach for heat transfer calculations in underground high voltage and middle voltage electrical power cables. First of the all typical layout of the cable in the sand or soil is described. Then numerical algorithms are targeted to the two-dimensional mathematical models of transient heat transfer. Finite Volume Method is suggested for calculations. Different strategies of nonorthogonality error elimination are considered. Acute triangles meshes were applied in two-dimensional domain to eliminate this error. Adaptive mesh is also tried. For calculations OpenFOAM open source software which uses Finite Volume Method is applied. To generate acute triangles meshes aCute library is used. The efficiency of the proposed approach is analyzed. The results show that the second order of convergence or close to that is achieved (in terms of sizes of finite volumes). Also it is shown that standard strategy, used by OpenFOAM is less efficient than the proposed approach. Finally it is concluded that for solving real problem a spatial adaptive mesh is essential and adaptive time steps also may be needed.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"46 - 53"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0007","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199305","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: 3

An Efficiency Analysis of Augmented Reality Marker Recognition Algorithm 增强现实标记识别算法的效率分析

IF 0.7

Electrical Control and Communication Engineering Pub Date : 2014-05-01 DOI: 10.2478/ecce-2014-0008

Dovilė Kurpytė, D. Navakauskas

{"title":"An Efficiency Analysis of Augmented Reality Marker Recognition Algorithm","authors":"Dovilė Kurpytė, D. Navakauskas","doi":"10.2478/ecce-2014-0008","DOIUrl":"https://doi.org/10.2478/ecce-2014-0008","url":null,"abstract":"Abstract The article reports on the investigation of augmented reality system which is designed for identification and augmentation of 100 different square markers. Marker recognition efficiency was investigated by rotating markers along x and y axis directions in range from −90° to 90°. Virtual simulations of four environments were developed: a) an intense source of light, b) an intense source of light falling from the left side, c) the non-intensive light source falling from the left side, d) equally falling shadows. The graphics were created using the OpenGL graphics computer hardware interface; image processing was programmed in C++ language using OpenCV, while augmented reality was developed in Java programming language using NyARToolKit. The obtained results demonstrate that augmented reality marker recognition algorithm is accurate and reliable in the case of changing lighting conditions and rotational angles - only 4 % markers were unidentified. Assessment of marker recognition efficiency let to propose marker classification strategy in order to use it for grouping various markers into distinct markers’ groups possessing similar recognition properties.","PeriodicalId":42365,"journal":{"name":"Electrical Control and Communication Engineering","volume":"5 1","pages":"54 - 60"},"PeriodicalIF":0.7,"publicationDate":"2014-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"https://sci-hub-pdf.com/10.2478/ecce-2014-0008","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"69199312","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: 4