Pub Date : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316598
N. Assimakis, A. Ktena, C. Manasis, E. Mele, N. Kunicina, A. Zabasta, T. Juhna
In this work we study applicability of Kalman filters as decision support for early warning and emergency response system for infectious diseases as CoVID-19. Here we use only the actual observations of new cases/deaths from epidemiological survey. We investigated the behavior of various time varying measurement driven models. We implement time varying Kalman filters. Preliminary results from Greece and Latvia showed that Kalman Filters can be used for short term forecasting of Co Vid-19cases. The mean percent absolute error may vary by model; some models give satisfactory results where the mean percent absolute error in new cases is of the order of 2%-5%. The mean absolute error in new deaths is of the order of 1–2 deaths. We propose the use of Kalman Filters for short term forecasting, i.e. next day, which can be a useful tool for improved crisis management at the points of entry to a country or hospitals.
在这项工作中，我们研究了卡尔曼滤波器作为CoVID-19等传染病预警和应急响应系统决策支持的适用性。在这里，我们只使用流行病学调查中新病例/死亡的实际观察结果。我们研究了各种时变测量驱动模型的行为。我们实现了时变卡尔曼滤波器。希腊和拉脱维亚的初步结果表明，卡尔曼滤波可用于Co vi -19病例的短期预报。平均绝对误差百分比可能因模型而异;有些模型给出了令人满意的结果，其中新情况下的平均绝对误差百分比为2%-5%。新死亡病例的平均绝对误差约为1-2例。我们建议使用卡尔曼滤波器进行短期预测，即第二天的预测，这可以成为改善国家或医院入境点危机管理的有用工具。
{"title":"Using the time varying Kalman filter for prediction of Covid-19 cases in Latvia and Greece","authors":"N. Assimakis, A. Ktena, C. Manasis, E. Mele, N. Kunicina, A. Zabasta, T. Juhna","doi":"10.1109/RTUCON51174.2020.9316598","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316598","url":null,"abstract":"In this work we study applicability of Kalman filters as decision support for early warning and emergency response system for infectious diseases as CoVID-19. Here we use only the actual observations of new cases/deaths from epidemiological survey. We investigated the behavior of various time varying measurement driven models. We implement time varying Kalman filters. Preliminary results from Greece and Latvia showed that Kalman Filters can be used for short term forecasting of Co Vid-19cases. The mean percent absolute error may vary by model; some models give satisfactory results where the mean percent absolute error in new cases is of the order of 2%-5%. The mean absolute error in new deaths is of the order of 1–2 deaths. We propose the use of Kalman Filters for short term forecasting, i.e. next day, which can be a useful tool for improved crisis management at the points of entry to a country or hospitals.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"108 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"122166229","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316608
M. Gorobetz, L. Zemite, A. Jasevičs, A. Korneyev
In a free electricity market where electricity is purchased on the stock exchange, it is necessary to purchase a corresponding amount of electricity at each local interval. All parties involved have provided electricity for purchase as accurately as possible, and therefore it is necessary to make as accurate a forecast as possible to the next trading interval so that no adjustments should be made as little as possible at the appropriate trading interval. The use of artificial lighting plays a major role in the changes to the consumer pattern curve, where it changes daily from sunrise and sunset, respectively.
{"title":"Intelligent Algorithm for using Overall Energy Consumption Statistics","authors":"M. Gorobetz, L. Zemite, A. Jasevičs, A. Korneyev","doi":"10.1109/RTUCON51174.2020.9316608","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316608","url":null,"abstract":"In a free electricity market where electricity is purchased on the stock exchange, it is necessary to purchase a corresponding amount of electricity at each local interval. All parties involved have provided electricity for purchase as accurately as possible, and therefore it is necessary to make as accurate a forecast as possible to the next trading interval so that no adjustments should be made as little as possible at the appropriate trading interval. The use of artificial lighting plays a major role in the changes to the consumer pattern curve, where it changes daily from sunrise and sunset, respectively.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"66 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123809840","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316579
Sichao Yang, Yi Meng, Xiangzan Meng
Researches have been conducted on the surrogate-modeling for better trade-off between solution accuracy and solving effort in design space exploration. In this paper, a robust method combining the deep-learning technique, image-transfer, with finite-element-modeling (FEM) in the electric machine optimization to accelerate the convergence is proposed. Specifically, a conditional generative-adversarial network is built to learn from the FEM simulated data about the relationship between the geometric drawing input and magnetic field plot output. The learned model can obtain the result 24x faster than finite-element modeling while maintaining the accuracy. This approximation model is then applied as the sample filter prior to the FEM in the genetic-algorithm powered optimization framework. The test done on a V-shape magnet motor optimization shows that closely matched Pareto-frontier can be found by this approach while the computing time is reduced by >50% at beginning stage for acceleration.
{"title":"Image Transfer Applied in Electric Machine Optimization","authors":"Sichao Yang, Yi Meng, Xiangzan Meng","doi":"10.1109/RTUCON51174.2020.9316579","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316579","url":null,"abstract":"Researches have been conducted on the surrogate-modeling for better trade-off between solution accuracy and solving effort in design space exploration. In this paper, a robust method combining the deep-learning technique, image-transfer, with finite-element-modeling (FEM) in the electric machine optimization to accelerate the convergence is proposed. Specifically, a conditional generative-adversarial network is built to learn from the FEM simulated data about the relationship between the geometric drawing input and magnetic field plot output. The learned model can obtain the result 24x faster than finite-element modeling while maintaining the accuracy. This approximation model is then applied as the sample filter prior to the FEM in the genetic-algorithm powered optimization framework. The test done on a V-shape magnet motor optimization shows that closely matched Pareto-frontier can be found by this approach while the computing time is reduced by >50% at beginning stage for acceleration.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"33 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"123946519","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316475
Jumayev Aganiyaz
The paper presents an analysis of the potential of solar energy in the regions of Turkmenistan. Based on the calculations of solar radiation in the regions of Turkmenistan, an estimate of the amount of solar energy received by the solar panel was obtained. The optimal orientation of solar panels and the expected amount of electricity generated by solar panels are determined.
{"title":"Possibilities of Using Solar Energy in the Regions of Turkmenistan","authors":"Jumayev Aganiyaz","doi":"10.1109/RTUCON51174.2020.9316475","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316475","url":null,"abstract":"The paper presents an analysis of the potential of solar energy in the regions of Turkmenistan. Based on the calculations of solar radiation in the regions of Turkmenistan, an estimate of the amount of solar energy received by the solar panel was obtained. The optimal orientation of solar panels and the expected amount of electricity generated by solar panels are determined.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"139 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"115480487","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316590
A. A. Antonov, A. Gusev, D. Dvorkin, Maksim S. Volkov
X-linked polyethylene (XLPE) cables are widely dispersed in grids of 110 kV and supposed to be used in specific environmental conditions because of its compactness and higher structural durability, resistance, and stability. These conditions may include laying in urban centers and cites or through different watercourses when traditional overhead lines application is impossible or unacceptable. Wherein, XLPE cables require a precise calculation of geometrical parameters of their laying, identification of optimal sheath grounding and phase transposition, etc. For example, close cable spacing may lead to thermal damages of all cores after single-phase short circuits. In its turn, the cable sheath transposition allows transfer capacity increasing, which is critical in grids of metropolises. In this paper, the authors propose a series of case studies and calculations, which allow identifying an optimal solution for three-phase cable line placement.
{"title":"Case Studies for Optimal Cable Line Placement and Sheath Grounding to Increase its Operational Characteristics","authors":"A. A. Antonov, A. Gusev, D. Dvorkin, Maksim S. Volkov","doi":"10.1109/RTUCON51174.2020.9316590","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316590","url":null,"abstract":"X-linked polyethylene (XLPE) cables are widely dispersed in grids of 110 kV and supposed to be used in specific environmental conditions because of its compactness and higher structural durability, resistance, and stability. These conditions may include laying in urban centers and cites or through different watercourses when traditional overhead lines application is impossible or unacceptable. Wherein, XLPE cables require a precise calculation of geometrical parameters of their laying, identification of optimal sheath grounding and phase transposition, etc. For example, close cable spacing may lead to thermal damages of all cores after single-phase short circuits. In its turn, the cable sheath transposition allows transfer capacity increasing, which is critical in grids of metropolises. In this paper, the authors propose a series of case studies and calculations, which allow identifying an optimal solution for three-phase cable line placement.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"50 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"114597258","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316569
P. V. Dhawas, P. Bedekar
An increasing number of fire and electric shock accidents in power sector increases the need for high impedance fault (HIF) detection as the existing over-current relay in the system is not able to detect the HIF state. The HIF detector employing sequence components of current along with voltage is proposed in this paper. The proposed HIF detector composed of two components i.e. current HIF detector and voltage HIF detector, in conjunction with existing distribution network set up. The first component analyzes current sequence components when fault appears in the network whereas later analyzes voltage sequence components. The current HIF detector operates when, significant amount of zero and negative sequence components starts appearing in the network. On the other hand, voltage HIF detector assists the current HIF detector in confirming the HIF state by examining the negative voltage sequence component. The performance of combined detector is evaluated by inducing high impedance fault at different nodes on the IEEE-6-bus radial balanced distribution system. The proposed detector makes use of only current and voltage of the system for HIF detection and doesn't require any additional feature extraction phase. The HIF detector in the proposed paper requires only one unit of sequence converter. Now, sequence components coming out from sequence converter are fed to HIF relay logic which is used in conjunction with existing over-current relay. Hence, this detector is cost effective as compared with the different HIF detectors presented in literature. The proposed method is simulated in a simulation environment. This method is fast and reliable as it detects the fault within one cycle.
{"title":"Improvement in High Impedance Fault Detection of Primary Distribution Network Using Voltage and Current Sequence Components","authors":"P. V. Dhawas, P. Bedekar","doi":"10.1109/RTUCON51174.2020.9316569","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316569","url":null,"abstract":"An increasing number of fire and electric shock accidents in power sector increases the need for high impedance fault (HIF) detection as the existing over-current relay in the system is not able to detect the HIF state. The HIF detector employing sequence components of current along with voltage is proposed in this paper. The proposed HIF detector composed of two components i.e. current HIF detector and voltage HIF detector, in conjunction with existing distribution network set up. The first component analyzes current sequence components when fault appears in the network whereas later analyzes voltage sequence components. The current HIF detector operates when, significant amount of zero and negative sequence components starts appearing in the network. On the other hand, voltage HIF detector assists the current HIF detector in confirming the HIF state by examining the negative voltage sequence component. The performance of combined detector is evaluated by inducing high impedance fault at different nodes on the IEEE-6-bus radial balanced distribution system. The proposed detector makes use of only current and voltage of the system for HIF detection and doesn't require any additional feature extraction phase. The HIF detector in the proposed paper requires only one unit of sequence converter. Now, sequence components coming out from sequence converter are fed to HIF relay logic which is used in conjunction with existing over-current relay. Hence, this detector is cost effective as compared with the different HIF detectors presented in literature. The proposed method is simulated in a simulation environment. This method is fast and reliable as it detects the fault within one cycle.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"447 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"125774699","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316565
S. Guseva, O. Borščevskis, N. Breners, S. Ribakovs
The emergence of large concentrated loads in urban facilities requires new technical solutions for their power supply. 10–20 kV transformer substation of large power with dry type insulation instead oil type insulation more often use in modern Latvian and other cities. The mathematical model-based comparison these transformer types and choosing of the best option on purchase and operation of dry or oil transformers are created. The value of total annual discounted costs for transformer whole life cycle is proposed for reasonable selection of transformer type.
{"title":"Technical and Economic Feasibility of Using Dry Transformers to Feed Large Concentrated Loads of Urban Facilities","authors":"S. Guseva, O. Borščevskis, N. Breners, S. Ribakovs","doi":"10.1109/RTUCON51174.2020.9316565","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316565","url":null,"abstract":"The emergence of large concentrated loads in urban facilities requires new technical solutions for their power supply. 10–20 kV transformer substation of large power with dry type insulation instead oil type insulation more often use in modern Latvian and other cities. The mathematical model-based comparison these transformer types and choosing of the best option on purchase and operation of dry or oil transformers are created. The value of total annual discounted costs for transformer whole life cycle is proposed for reasonable selection of transformer type.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"45 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"126880513","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316592
Matīss Stunda, M. Baghdadi, L. Ribickis, O. Hegazy
This work discusses the practical development of a HiL induction machine test rig. An OP4510 realtime computer by Opal-RT is used to run the vector control algorithm designed in Matlab Simulink. Assembly and configuration of the setup are outlined. Initial test results of IFOC in torque control mode are discussed. Effects of d-q cross coupling due to motor parameter inaccuracies are demonstrated.
{"title":"Induction Machine HiL Setup Implementation and IFOC Testing Based on the OP4510 Realtime Computer","authors":"Matīss Stunda, M. Baghdadi, L. Ribickis, O. Hegazy","doi":"10.1109/RTUCON51174.2020.9316592","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316592","url":null,"abstract":"This work discusses the practical development of a HiL induction machine test rig. An OP4510 realtime computer by Opal-RT is used to run the vector control algorithm designed in Matlab Simulink. Assembly and configuration of the setup are outlined. Initial test results of IFOC in torque control mode are discussed. Effects of d-q cross coupling due to motor parameter inaccuracies are demonstrated.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"138 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127340448","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316559
M. Maltisovs, D. Pikulins, K. Krumins, A. Ozols
Nowadays Liquid Crystal Display (LCD) is an integral part of humans' everyday life. They are used in everything starting from cell phones and televisions to washing machines. Liquid Crystals (LC) have far wider applications, one of them - smart or switchable glass, glass with voltage dependent optical properties which can be altered if specific electrical signals are applied to the glass. Bistable smectic-A (SmA) LCD is one of the most promising devices for smart glass applications due to long term bistability, low haze at clear state, low transmittance at scatter state and low power consumption. Every product that has been developed needs to be tested to verify and validate the design and development processes. To make sure the product is safe for customer, complies with necessary product, product group and manufacturing standards, performs the function it is required to perform. In this paper bistable smectic-A liquid crystal display extended functional testing methodology is presented. As well as the most common defects that appeared during and after the testing are reviewed and analyzed.
如今，液晶显示器(LCD)已成为人们日常生活中不可或缺的一部分。从手机、电视到洗衣机，它们无处不在。液晶(LC)有更广泛的应用，其中之一是智能或可切换玻璃，具有电压依赖光学特性的玻璃，如果施加特定的电信号，可以改变其光学特性。双稳态smic - a (SmA) LCD具有长期双稳性、透明状态低雾霾、散射状态低透射率和低功耗等优点，是智能玻璃应用中最有前途的器件之一。每个已开发的产品都需要进行测试，以验证和验证设计和开发过程。确保产品对客户是安全的，符合必要的产品、产品组和制造标准，执行其需要执行的功能。本文提出了双稳态smic - a液晶显示器扩展功能测试方法。以及在测试期间和之后出现的最常见的缺陷进行了审查和分析。
{"title":"Identifying defects in bistable smectic-A liquid crystal displays after extended period of functional testing","authors":"M. Maltisovs, D. Pikulins, K. Krumins, A. Ozols","doi":"10.1109/RTUCON51174.2020.9316559","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316559","url":null,"abstract":"Nowadays Liquid Crystal Display (LCD) is an integral part of humans' everyday life. They are used in everything starting from cell phones and televisions to washing machines. Liquid Crystals (LC) have far wider applications, one of them - smart or switchable glass, glass with voltage dependent optical properties which can be altered if specific electrical signals are applied to the glass. Bistable smectic-A (SmA) LCD is one of the most promising devices for smart glass applications due to long term bistability, low haze at clear state, low transmittance at scatter state and low power consumption. Every product that has been developed needs to be tested to verify and validate the design and development processes. To make sure the product is safe for customer, complies with necessary product, product group and manufacturing standards, performs the function it is required to perform. In this paper bistable smectic-A liquid crystal display extended functional testing methodology is presented. As well as the most common defects that appeared during and after the testing are reviewed and analyzed.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"8 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"127288346","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 : 2020-11-05DOI: 10.1109/RTUCON51174.2020.9316581
Alexander Bubovich, I. Galkin
This paper deals with the problem of the defining optimal switching times in modular multilevel converters (MMC) with independent voltage sources, if no pulse width modulation (PWM) technique is used. By using MATLAB Simulink modulation several schematics were analyzed (starting from 3 level MMC till 15 level MMC) with different module switching patterns. Different switching patterns of modules of MMC are compared by one parameter - total harmonic distortion (THD) of the output voltage waveform. Mathematical background of calculation of optimal switching times is also presented.
{"title":"Evaluation of Optimal Switching of Modular Multilevel Inverter with Independent Voltage Sources","authors":"Alexander Bubovich, I. Galkin","doi":"10.1109/RTUCON51174.2020.9316581","DOIUrl":"https://doi.org/10.1109/RTUCON51174.2020.9316581","url":null,"abstract":"This paper deals with the problem of the defining optimal switching times in modular multilevel converters (MMC) with independent voltage sources, if no pulse width modulation (PWM) technique is used. By using MATLAB Simulink modulation several schematics were analyzed (starting from 3 level MMC till 15 level MMC) with different module switching patterns. Different switching patterns of modules of MMC are compared by one parameter - total harmonic distortion (THD) of the output voltage waveform. Mathematical background of calculation of optimal switching times is also presented.","PeriodicalId":332414,"journal":{"name":"2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)","volume":"82 1","pages":"0"},"PeriodicalIF":0.0,"publicationDate":"2020-11-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"134193247","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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