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2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)最新文献

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Evaluation of static characteristic coefficients basing on field test data 基于现场试验数据的静特性系数评估
Anastasia Kovaleva, A. Tavlintsev, E. Lyukhanov, S. Gusev, I. Zicmane, L. Petrichenko
It is known that composition and behavior of an electrical load are constantly changing over time, therefore, to model and analyze the modes of power systems, it is necessary to update load models. This article proposes a method for processing the data of passive measurements to obtain static characteristic coefficients of loads. The developed algorithm includes the following subtasks: selection of initial data; determination of an acceptable modeling interval; clustering and filtering of measurement data; selection and statistical evaluation of the load static characteristic. This algorithm was applied to estimate coefficients of linearized static characteristic model of a real load node based on the field measurements and showed results close to the previously obtained experimental estimates for this type of load. This indicates the applicability of the proposed method for assessing the static characteristic coefficients of various load nodes.
众所周知,电力负荷的组成和行为是随时间不断变化的,因此,为了建模和分析电力系统的模式,有必要更新负荷模型。本文提出了一种处理被动测量数据以获得载荷静态特征系数的方法。所开发的算法包括以下子任务:初始数据的选择;确定可接受的建模区间;测量数据的聚类与过滤;负载静态特性的选择与统计评价。将该算法应用于基于现场实测的实际负载节点线性化静态特性模型系数估计,结果与该类型负载的实验估计值接近。这表明所提出的方法适用于评估各荷载节点的静态特征系数。
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引用次数: 0
Evaluation of Optimal Switching of Modular Multilevel Inverter with Independent Voltage Sources 独立电压源模块化多电平逆变器的最优开关评估
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.
本文研究了在不使用脉宽调制(PWM)技术的情况下,具有独立电压源的模块化多电平变换器(MMC)的最佳开关时间的定义问题。通过MATLAB Simulink调制,分析了不同模块切换方式下的几种原理图(从3级MMC到15级MMC)。通过输出电压波形的总谐波失真(THD)参数对MMC模块的不同开关方式进行了比较。给出了最优切换时间计算的数学背景。
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引用次数: 5
Thermal Modelling of a Control Center for Flexibility Analysis in nZEB Nanogrids nZEB纳米网格柔性分析控制中心的热建模
Tobias Häring, A. Rosin, Tuule Mall Kull, J. Helguero, H. Biechl
Due to the increasing share of volatile renewable energy sources, like photovoltaics (PV) and wind energy in nearly Zero Energy Buildings (nZEB), there is an increasing need for demand-side management (DSM) or demand response (DR) programs to balance the production and consumption in the grid. The flexibility that can be obtained for smart grids from such DR methods is not limited to appliances like water heaters or dishwashers but can also be achieved with space heating and air-conditioning. In such an interdisciplinary investigation, often one part is simplified, in this case, typically either the thermal models or the implemented DR strategy are very detailed. In this work, a detailed thermal model of a control center is obtained and calibrated in IDA ICE building-modelling software with measurements from a test site in Germany. Afterward, several price-based load matching algorithms are applied to the model to see the possible flexibility exploitation with the thermal capacity of this small building. Not all investigated algorithms show good performance but some of them show promising results. Thus, this model can be used for DR methods and should be extended to work with more DSM strategies and provide ancillary services.
由于不稳定的可再生能源,如光伏(PV)和风能在近零能耗建筑(nZEB)中的份额越来越大,对需求侧管理(DSM)或需求响应(DR)计划的需求越来越大,以平衡电网的生产和消费。从这种DR方法中获得的智能电网的灵活性不仅限于热水器或洗碗机等电器,还可以实现空间供暖和空调。在这样的跨学科研究中,通常有一部分是简化的,在这种情况下,通常是热模型或实施的DR策略非常详细。在这项工作中,获得了控制中心的详细热模型,并在IDA ICE建筑建模软件中使用德国测试站点的测量数据进行了校准。然后,将几种基于价格的负荷匹配算法应用到模型中,以查看该小型建筑的热容量可能的灵活性开发。并非所有研究的算法都表现出良好的性能,但其中一些算法显示出有希望的结果。因此,该模型可用于DR方法,并应扩展到与更多的DSM策略一起工作,并提供辅助服务。
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引用次数: 3
Digital Twin Data Handling for Propulsion Drive System of Autonomous Electric Vehicle: Case Study 自动驾驶电动汽车推进驱动系统的数字孪生数据处理:案例研究
A. Rassõlkin, V. Rjabtšikov, T. Vaimann, A. Kallaste, V. Kuts, G. Demidova
Nowadays, data is not just a collection of static documents, but a continuous flow of information. Research projects are required not only to manage data efficiently but also to keep it safe to ensure that it can be later correctly interpreted and reused. The Data Management Plan (DMP) is a document that describes the data management life cycle for the data to be collected, processed and/or generated during the project workflow. The DMP is not a fixed but rather a living document that will evolve through the lifespan of the project. A general idea of the paper is to give a brief description of the data (including any existing data, data taken from third-party sources or produced data) that is used during the project lifetime. Special attention is paid on how the data is created and collected, how the data is organized during the project (naming conventions, version control, and folder structures). Moreover, the choice of format and implications of data format and data volumes in terms of storage, backup, and access is discussed.
如今,数据不仅仅是静态文档的集合,而是连续的信息流。研究项目不仅需要有效地管理数据,还需要保证数据的安全,以确保以后可以正确地解释和重用数据。数据管理计划(DMP)是描述在项目工作流程中收集、处理和/或生成的数据的数据管理生命周期的文件。DMP不是固定的,而是在项目的整个生命周期中不断发展的动态文档。本文的总体思路是对项目生命周期中使用的数据(包括任何现有数据、从第三方来源获取的数据或生成的数据)进行简要描述。特别关注的是如何创建和收集数据,以及在项目期间如何组织数据(命名约定、版本控制和文件夹结构)。此外,还讨论了格式的选择以及数据格式和数据量在存储、备份和访问方面的含义。
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引用次数: 3
Using the time varying Kalman filter for prediction of Covid-19 cases in Latvia and Greece 利用时变卡尔曼滤波器预测拉脱维亚和希腊的Covid-19病例
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。
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引用次数: 4
Measuring the impact of demand response services on electricity prices in Latvian electricity market 衡量需求响应服务对拉脱维亚电力市场电价的影响
L. Kurevska, A. Sauhats, G. Junghāns, Valentīns Lavrinovcs
Improved end-user engagement is considered to be a key factor in decarbonization efforts towards climate neutral energy systems. While local implementations of implicit and explicit demand response solutions have been available to end consumers, energy consumption optimization is still in the stage of early adopters and no aggregator services have emerged. The new regulation allowing demand response to enter Day-ahead market is expected to have an impact on the electricity prices. The objective of this paper is to perform factor analysis on Latvian wholesale electricity market prices to determine the effect of the introduction of demand response in day ahead market might have on other market participants.
提高终端用户参与度被认为是实现气候中和能源系统脱碳努力的关键因素。虽然终端消费者已经可以使用隐式和显式需求响应解决方案的本地实现,但能耗优化仍处于早期采用者的阶段,还没有出现聚合服务。允许需求响应进入日前市场的新规定预计将对电价产生影响。本文的目的是对拉脱维亚批发电力市场价格进行因子分析,以确定在日前市场引入需求响应可能对其他市场参与者产生的影响。
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引用次数: 2
Method of Distance Load Recognition based on the Processing of High Sampled Current Oscillograms 基于高采样电流示波器处理的距离负载识别方法
N. Mukhlynin, Alan Celestino
This paper is devoted to a new method of load recognition that discards direct installation of sensors near consumer loads (distant sensorless technology). This method can be used for state monitoring of critical electrical loads when the creation of a conventional local dispatch system with traditional sensors is impossible. This method's key idea is to employ a unique combination of discrete and continuous wavelet transforms to analyze the high sampled oscillograms of current loads. The continuous transform applies a set of non-standard consumer's mother wavelets, making it possible to single out one out of identical electrical loads in the complex current signal. This algorithm is pre-configured and trained to identify target loads, and it also has conditions of applicability. It could be part of a software in a device for monitoring critical electrical loads in life support systems (water and air pumps in mines, electric motors operating in aggressive conditions, etc.). In addition, it is possible to control individual malfunctions of electric devices. The criterion of deterioration in stability of load recognition is the decline in the quality of the set of unique consumer's mother wavelets.
本文致力于一种新的负载识别方法,该方法抛弃了在消费者负载附近直接安装传感器的方法(远程无传感器技术)。该方法可用于在无法使用传统传感器创建传统局部调度系统的情况下对关键电力负荷进行状态监测。该方法的核心思想是采用离散和连续小波变换的独特组合来分析电流负载的高采样示波器。连续变换应用了一组非标准的消费者母小波,使得在复杂的电流信号中从相同的电负载中挑出一个成为可能。该算法经过预先配置和训练,能够识别目标负载,并具有一定的适用性。它可能是监控生命维持系统(矿井中的水泵和气泵,恶劣条件下运行的电动机等)中关键电气负荷设备软件的一部分。此外,还可以控制电气设备的个别故障。负荷识别稳定性下降的判据是唯一消费者母小波集合的质量下降。
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引用次数: 0
Distribution Grid Three-Phase Power Flow Algorithm Based On Flow Model 基于潮流模型的配电网三相潮流算法
Pavel Y. Bannykh, A. Pazderin
Distribution grid analysis is based on distribution grid power flow calculation. New power flow algorithm for distribution network is developed. Three-phase flow model is presented. The presented model is a development of single-line flow model. Three-phase flow model give the opportunity use advantages of flow model and take into account unbalanced condition of distribution grids. In addition, in three-phase power flow there is a convergence problem in system with wye delta transformer. Presented three-phase flow model solve this problem. Comparative numerical analysis with another three-phase power flow methods performed. Experiments show that presented flow model has better convergence characteristics.
配电网分析是以配电网潮流计算为基础的。提出了一种新的配电网潮流算法。提出了三相流模型。该模型是对单线流模型的发展。三相潮流模型利用了潮流模型的优点,同时考虑了配电网的不平衡状态。此外,在三相潮流中,带三角形变压器的系统存在收敛问题。提出的三相流模型解决了这一问题。并与其它三相潮流方法进行了数值比较分析。实验表明,该模型具有较好的收敛特性。
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引用次数: 4
“Discount” - the renewable energy production impact on electricity price “折价”——可再生能源生产对电价的影响
Lauri Ulm, H. Koduvere, I. Palu
In coming years the amount of renewable energy production compared to the production from conventional power plants will increase. The electricity produced from wind energy is considered to be the one with the lowest levelized cost of energy and could be a dominant electricity source in the future. The dismantling of conventional power plants and increase in variable renewable energy production will have effect on the average electricity price on the Nord Pool market to the consumers, but even more to the wind electricity producers. Three scenarios of wind energy installed capacity from years 2025 to 2045 were analyzed with Balmorel program in Estonia and nearby countries. As a results two simplified models to determine the average electricity price and the discount effect in relation to installed wind energy capacity was introduced.
在未来几年,与传统发电厂的产量相比,可再生能源的产量将会增加。风能发电被认为是能源平准化成本最低的一种,在未来可能成为主要的电力来源。传统发电厂的拆除和可变可再生能源生产的增加将对北池市场上消费者的平均电价产生影响,但对风力发电商的影响更大。结合爱沙尼亚及周边国家的Balmorel项目,分析了2025 - 2045年风电装机容量的三种情景。为此,提出了确定平均电价和风电装机容量贴现效应的两种简化模型。
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引用次数: 0
Review of disaster resilience assessment methods: (Quantitative aspects for renewable energy systems modelling) 灾害恢复能力评估方法综述:(可再生能源系统建模的定量方面)
Maksims Feofilovs, Armands Gravelsins, F. Romagnoli
The topicality of resilience assessment has grown in many science fields over last decades, including energy systems modeling. The variety of existing resilience assessment methods is large, therefore this article outlines the most important features of different quantitative methods. The conclusions of literature review performed in this study provide relevant information for energy systems modelers that aim at integrating resilience assessment into their models.
在过去的几十年里,弹性评估的话题性在许多科学领域都得到了发展,包括能源系统建模。现有的弹性评估方法种类繁多,因此本文概述了不同定量方法的最重要特点。本研究的文献综述结论为旨在将弹性评估纳入其模型的能源系统建模者提供了相关信息。
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引用次数: 0
期刊
2020 IEEE 61th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
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