2020 International Ural Conference on Electrical Power Engineering (UralCon)最新文献_第6页

Construction of Resource-Saving Differential Protections for Converter Units with Transformers with 2N Secondary Windings and 2N Rectifiers 2N次绕组变压器+ 2N整流器换流装置节约型差动保护的构建

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216256

M. Kletsel’, A. Barukin, Aset Gabdulov

{"title":"Construction of Resource-Saving Differential Protections for Converter Units with Transformers with 2N Secondary Windings and 2N Rectifiers","authors":"M. Kletsel’, A. Barukin, Aset Gabdulov","doi":"10.1109/UralCon49858.2020.9216256","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216256","url":null,"abstract":"Relevance of the development of resource-saving differential protections without current transformers for converter units with transformers with 2n secondary windings (n is the number of star- and delta-connected secondary windings of the transformers) and 2n rectifiers is justified. Two new techniques are suggested for the construction of such protections. The first technique consists in measuring EMF at the leads of inductance coils mounted near the busbars of all phases from the low voltage side of the transformer of a converter unit, equalizing and subtracting EMFs induced by currents in these busbars obtained from the coils for the same phases, and the comparison between the resulted differences with the reference value. In the second technique, in addition to inductance coils mounted like as in the first technique, a reed with a control winding is suggested to mounted near the DC conductor busbar. The difference between the magnetic fluxes generated by the current in this busbar and by the current in the reed winding, proportional to the total rectified EMFs received from the coils mounted near the busbars of the same phases, is compared with the magnetic flux sufficient to trigger a reed which indicates a damage when its contacts are closed and sends a signal to disconnect the protected unit from the network. Models of the devices which implement the protection techniques suggested are described, and their behavior in different converter units operating modes is analyzed.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"71 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126104341","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: 7

Push-Pull Step-Up DC/DC Converters with Closed Input 具有闭合输入的推挽升压DC/DC变换器

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216292

K. Bykov, N. Lazareva, Victor Yarov

引用次数: 0

Development of Mathematical Model of Joint Work of Heat Pump and Cogeneration Power Plant 热泵与热电联产电厂联合工作数学模型的建立

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216293

G. Tseyzer, O. Ptashkina-Girina, G. Ryavkin

引用次数: 1

Neural Network for Pulsed Ultrasonic Vibration Control of Electrical Equipment 电气设备脉冲超声振动控制的神经网络

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216248

A. Bychkov, L. Slavutskii, Elena Vladimirovna Slavutskaya

引用次数: 7

Control Systems for High Voltage Thyristor Arms of Ice Melting Plants on Overhead Transmission Lines 架空输电线路融冰装置高压晶闸管臂控制系统

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216270

S. Shovkoplyas, L. A. Zhlobitsky, I. S. Bakaev

引用次数: 2

Comparative Analysis of the Digital Measurement Methods of Active Power with the Application of Approximation Polynomials 有功功率数字测量方法与近似多项式应用的比较分析

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216251

Igor V. Levashov, A. Shatokhin, A. Serov

{"title":"Comparative Analysis of the Digital Measurement Methods of Active Power with the Application of Approximation Polynomials","authors":"Igor V. Levashov, A. Shatokhin, A. Serov","doi":"10.1109/UralCon49858.2020.9216251","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216251","url":null,"abstract":"In this article, a comparative analysis of digital methods for the measurement of active power with the application of approximation polynomials is performed. Zero-order and first-order polynomials are considered. For each of the applied approximating polynomials, a measurement algorithm is proposed; the methodological error for the case of sinusoidal current and voltage is analyzed; recommendations to reduce the measurement error have been developed. Analytical relations are obtained allows to choose the values of the sampling frequency and the measurement time. It is shown that approximation by zero-order polynomials is much more efficient than approximation by first-order polynomials. For the case of applying the approximation polynomial of the zero-order, the methods for reducing the methodological measurement error are proposed. These methods are based on the adjustment of the number of averaged samples, the adjustment of the initial phase of the signal and the combined adjustment of the number of averaged samples and the value of the initial phase (combined technique). To apply the proposed methods, an additional measurement frequency converter is required. The reliability of the analytical relationships is confirmed by the coincidence of the analytical results and the results of simulation modeling at control points. By using software package Simulink, simulation modeling was performed to evaluate the effectiveness of the considered methods for the active power measurement.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"123 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"124463485","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: 1

Stability Issues for Modern Microgrids 现代微电网的稳定性问题

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216279

I. Lipuzhin

引用次数: 0

The Use of “Technical Rigidity” Indices to Assess Climatic Factors Effects on Power Transformers Reliability 用“技术刚度”指标评价气候因素对电力变压器可靠性的影响

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216258

I. Khudonogov, E. Puzina, A. Tuigunova

引用次数: 5

Increased Probability of Proper Operation of Filter Protection Devices Against Phase Failure at Voltage Asymmetry in Rural Electrical Networks 提高农村电网电压不对称时滤波器保护装置正常运行的概率

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216236

S. Oskin, A. Makarenko, A. Miroshnikov

{"title":"Increased Probability of Proper Operation of Filter Protection Devices Against Phase Failure at Voltage Asymmetry in Rural Electrical Networks","authors":"S. Oskin, A. Makarenko, A. Miroshnikov","doi":"10.1109/UralCon49858.2020.9216236","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216236","url":null,"abstract":"The specificity of rural electrical networks is the high level of asymmetry of supply voltage. The asymmetrical modes of the power network have randomized character. There is also a high level of drive motors failures in agricultural branch. The reasons for their failures is the voltage asymmetry and phase failure of the supply grid. Existing protection devices, including voltage filters, often do not switch off electric machines in case of such emergency modes due to the impact of accidental voltage asymmetry. A voltage vector of zero sequence could be represented as two-dimensional random continuous function, and the formula for calculation of probability of its impact in a given area in a plot is proposed. The formula for calculation of probability of proper operation of the filter protection device at occurrence of an asymmetric mode is resulted, and calculation of such probabilities is done: at operation in an asymmetric grid at level of average statistical values and break-off of a motor phase, probabilities of proper operation of a protection device on voltage of zero sequence and separate phases are in the interval from 59 % up to 86 %. It is more effective to connect the filter to the artificial zero point, which will make it possible to eliminate the influence of accidental voltage asymmetry and to reconfigure the filter to a higher threshold of triggering with reaching 100% proper operation at motor phase failure.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"44 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"133666396","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

Evolution and Development Prospects of Electric Propulsion Systems of Large Sea Ships 大型海上船舶电力推进系统的演变与发展前景

2020 International Ural Conference on Electrical Power Engineering (UralCon) Pub Date : 2020-09-01 DOI: 10.1109/UralCon49858.2020.9216231

A. M. Marques Cardoso, E. Popkov, E. Koptjaev

{"title":"Evolution and Development Prospects of Electric Propulsion Systems of Large Sea Ships","authors":"A. M. Marques Cardoso, E. Popkov, E. Koptjaev","doi":"10.1109/UralCon49858.2020.9216231","DOIUrl":"https://doi.org/10.1109/UralCon49858.2020.9216231","url":null,"abstract":"Large sea ships take a huge part in world trade, passenger transport and providing supply to remote areas. There are various ship classes, designed not only for transportation of goods, but also to perform special tasks. The mentioned type of ships includes icebreakers designed to support navigation in the Arctic region. They are distinguished by a large displacement and high-capacity propulsion plant, as well as a dynamic mode of operation with frequent reverses. Many other ship types also use an electric drive in their propulsion systems, which is due to operating conditions and reliability requirements. Electric propulsion systems have the ability to change the direction of rotation with frequent repeated cycles. Currently, AC electric propulsion systems are used most widely, replacing obsolete DC motors. With a retrospective view of electric propulsion systems, a sequential development becomes obvious. The modern marine electric drive should be further improved in terms of its capacity and operation cost-effectiveness. The last of these tasks is mainly to increase efficiency and reduce losses both when converting the frequency of the supply voltage and in general in all parts of the electric propulsion system. In practice, with the modern development of technology, the reserve for improving properties of electric components is not so great. In this case, the single way to increase the efficiency of shipboard electric propulsion systems is reducing the number of functional units on the way from ship generators to the engine motor. The authors proposed a number of technical solutions for improving ship electrical propulsion systems; the novelty is confirmed by patents for inventions. One of the solution effects is the simplification of the functional circuit of the electric propulsion system, which corresponds to the general development trend- a decrease in the number of functional units and elements on the way from the ship energy source to the electric engine.","PeriodicalId":230353,"journal":{"name":"2020 International Ural Conference on Electrical Power Engineering (UralCon)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-09-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"130495542","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