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2019 IEEE 60th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)最新文献

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A Stochastic Nonlinear Excitation Controller for Transient Stabilization in a Power System 电力系统暂态稳定的随机非线性励磁控制器
Yan Xu, F. Wen, I. Palu, Zeng Yang, Minghui Chen, Hongwei Zhao, Huiyu Shang
Stochastic disturbances caused by renewable energy systems (e.g., wind power and solar power) may deteriorate the transient stability problems in a power system. This paper proposes a stochastic nonlinear excitation controller for transient stability enhancement in a multimachine power system. The third-order model of generators is adopted. A new probabilistic stability criterion is presented where the magnitude of a stochastic disturbance is included explicitly. Then the whole power system is represented by a nonlinear stochastic differential equation set. The proposed excitation controller is implemented by leveraging the feature of a stochastic port-Hamiltonian system. Compared with the controller design methods based on the deterministic power system model, the proposed method can improve the system stability even in the presence of continuous stochastic disturbances on power injections. Besides, it is convenient to select the Hamiltonian function as the stochastic Lyapunov function in the proposed approach. Finally, the effectiveness of the proposed method is demonstrated by a two-area test system with a three-phase fault.
可再生能源系统(如风能和太阳能)引起的随机扰动可能会恶化电力系统的暂态稳定性问题。本文提出了一种用于多机电力系统暂态稳定增强的随机非线性励磁控制器。发电机采用三阶模型。提出了一种新的概率稳定性判据,其中明确地包含了随机扰动的大小。然后用非线性随机微分方程组来表示整个电力系统。所提出的励磁控制器是利用随机端口-哈密顿系统的特性来实现的。与基于确定性电力系统模型的控制器设计方法相比,该方法可以提高系统在连续随机扰动下的稳定性。此外,在该方法中,选择哈密顿函数作为随机Lyapunov函数也很方便。最后,通过一个三相故障的两区测试系统验证了该方法的有效性。
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引用次数: 1
A Novel High Bandwidth Bipolar Corrector Power Supply in Taiwan Photon Source 台湾光子源之新型高频宽双极校正电源
Y. Wong, Jhao-Cyuan Huang, K. Liu, C. Liu, Bao-sheng Wang
The first light of Taiwan's photon source was produced on December 2013. TPS has been in operation for 6 years and mean time between fail (MTBF) has reached world class standards. The NSRRC upgrade of a storage ring and booster ring requires fast bipolar power supplies for the fast correction magnets. For the fast correction magnets are requirement of the correction power supplies must had a high bandwidth of 10kHz for the output current. A prototype DC/DC corrector power supply using a MOSFET full bridge circuit with a 200kHz PWM control signal and achieved up of 10kHz bandwidth with less than 3-dB attenuation for a small refer signal of the maximum operation current of 10 amperes. Finally, the prototype achieved an 11 kHz bandwidth with less than 3 dB attenuation for a refer signal 0.1V (equal to 0.lA). This paper also presents the designs of the power circuit, control circuit, MOSFET driver circuit, auxiliary & regulator power circuit, protection circuit, and component layout. The experimental results, the effectiveness of the control loop design can be verified from the gain margin and phase margin.
2013年12月,台湾的光子源产生了第一束光。TPS已运行6年,平均无故障时间(MTBF)达到世界一流标准。NSRRC对存储环和升压环的升级需要为快速校正磁铁提供快速双极电源。对于快速校正磁铁的要求,校正电源的输出电流必须具有10kHz的高带宽。一个原型DC/DC校正电源采用MOSFET全桥电路和200kHz PWM控制信号,在最大工作电流为10安培的小参考信号下实现了高达10kHz的带宽和小于3db的衰减。最后,该原型在参考信号0.1V(等于0.lA)时实现了11 kHz的带宽,衰减小于3 dB。文中还介绍了电源电路、控制电路、MOSFET驱动电路、辅助稳压电源电路、保护电路的设计和元器件布局。实验结果表明,从增益裕度和相位裕度可以验证控制回路设计的有效性。
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引用次数: 0
Sensor Matrix for Evaluation of Clothing Fit 服装合身度评价的传感器矩阵
L. Siliņa, I. Dāboliņa, E. Lapkovska, Janis Dabolins, P. Apse-Apsitis, Jolanta Graudone
The article deals with a new sensor matrix for evaluation of clothing fit from the perspective of wearers' comfort. The pressure between soft surfaces is tested with capacitive sensors. Obtained results are compared with other fit evaluation methods such as 3D scanning, thermal imaging, and clothing virtual prototyping.
本文从穿着者舒适度的角度出发,提出了一种新的服装合身度评价传感器矩阵。用电容式传感器测试软表面之间的压力。将所得结果与3D扫描、热成像和服装虚拟样机等其他适合度评估方法进行了比较。
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引用次数: 7
Review of Burn-In for Production of Reliable Power Electronic Applications 用于生产可靠电力电子产品的老化技术综述
O. Bormanis, L. Ribickis
Role of burn-in in the life cycle of power electronics assemblies is discussed in this paper. Differences between burn-in and other production screening methods are highlighted. This paper reviews burn-in testing as a part of production reliability improvement program discussing its benefits and challenges.
本文讨论了电力电子组件的老化在其生命周期中的作用。强调了老化和其他生产筛选方法的区别。本文回顾了作为生产可靠性改进计划的一部分的老化测试,讨论了它的好处和挑战。
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引用次数: 0
Power Losses Analysis in Thermal Design of a Synchronous Reluctance Motor 同步磁阻电机热设计中的功率损耗分析
P. S. Ghahfarokhi, A. Kallaste, T. Vaimann, A. Belahcen
This paper gives an overview of the different sources of losses in a synchronous reluctance motor. The first section investigates different losses in the motor and proposes different calculation methods of power losses in a synchronous reluctance motor. In the second part, the experimental no-load test is proposed to measure the losses of the motor.
本文概述了同步磁阻电动机的各种损耗源。第一部分研究了电机的不同损耗,并提出了同步磁阻电机功率损耗的不同计算方法。在第二部分,提出了实验空载测试来测量电机的损耗。
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引用次数: 1
Simulation of the Sensorless Switched Reluctance Motor Drives 无传感器开关磁阻电机驱动的仿真
A. Krasovsky, S. Vasyukov, Elena Vostorgina
This paper considers sensorless control of switched reluctance motor drives, in which switching positions of the phases are determined by comparing the calculated and measured values of flux linkage. In the practical implementation of this algorithm, under certain conditions, a progressive accumulation of errors appears in determining of the switching position. To identify these conditions simulation model of the drive in MATLAB - SIMULINK has been developed. Simulation showed that one of the reasons for the failure of the algorithm may be the spread of the electromagnetic parameters of the phases due to technological deviations in the manufacture of the motor. Theoretical studies were confirmed experimentally.
本文研究了开关磁阻电机驱动的无传感器控制,通过比较磁链的计算值和实测值来确定相的开关位置。在该算法的实际实现中,在一定条件下,切换位置的确定会出现误差的逐步累积。为了识别这些条件,在MATLAB - SIMULINK中建立了驱动器的仿真模型。仿真结果表明,该算法失效的原因之一可能是由于电机制造过程中的工艺偏差导致相的电磁参数扩散。理论研究得到了实验的证实。
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引用次数: 2
Implementation of Quasi-Static Time Series Simulations for Analysis of the Impact of Electric Vehicles on the Grid 电动汽车对电网影响分析的准静态时间序列仿真实现
C. Allenspach, Reto Högger, A. Obushevs, P. Korba, Helen Reist
In this paper, symmetrical electric vehicle charging impacts in existing low-voltage distribution grid are investigated throughout proposed methodology and their results analysed. Symmetrical loading- and voltage-related impacts are assessed for the extensive grid. A synthetic EV mix pattern was used with the purpose to demonstrate a universal observation of charging impacts. These patterns were allocated quasi-randomly to the points of common coupling within the grid based on predefined scenarios - 8, 10, 12 and 20 percent. Subsequently, quasi-static time series simulations for a duration of one year in 10-minute time steps were executed. Consequently, this paper yields results, which offer practical insight in the maximum share of electric vehicle charging in low-voltage distribution grids and provide guidance for future decision-making of distribution grid operators.
本文利用所提出的方法研究了现有低压配电网中电动汽车对称充电的影响,并对结果进行了分析。对大电网的对称负载和电压相关影响进行了评估。为了证明对充电影响的普遍观察,采用了一种合成的电动汽车混合模式。这些模式被准随机地分配到基于预定义场景的网格内的公共耦合点——8%、10%、12%和20%。随后,以10分钟的时间步长进行了为期一年的准静态时间序列模拟。本文的研究结果对低压配电网中电动汽车充电的最大份额具有实际意义,并为配电网运营商未来的决策提供指导。
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引用次数: 1
Analysis of battery-based virtual inertia & primary frequency response on improving frequency dynamics in an island hydro-diesel-PV ac-grid 基于电池的虚拟惯性分析及改善孤岛型水电-柴油-光伏交流电网频率动态的一次频率响应
P.A. Tedjoe, C. Ally, E. D. de Jong
The displacement of conventional generation in an island power system by inertia-less generation such as PV, reduces the adequacy of the frequency response countermeasures provided by the remaining generation units. A chemical battery energy storage system (BESS) providing compensation techniques such as virtual inertia response (VIR) and droop-based primary frequency response (PFR) can supply the corrective power needed to remedy the increased frequency volatility. This study explores the frequency volatility in a 300 MW hydro-diesel ac-island grid for increasing levels of PV up to a target of 100 MW, and the corrective impact of BESS-based VIR and PFR. The analysis conducted in MATLAB-Simulink® showed that the combined governor response of both hydro and diesel units where fast enough to compensate the aggregated PV plant ramps, and therefore no BESS support would be required for such power imbalances. Analysis of the frequency volatility to the event of losing a large hydro unit, showed that the rate of change of frequency (ROCOF) would change approximately 0.043 Hz/s for every unit change in the systems rotational inertia, increasing from 0.48 Hz/s and exceeding a target ROCOF of 1 Hz/s. The final ROCOF was 1.24 Hz/s at the 100 MW PV level. In this case, 6.52 MW BESS-based VIR and PFR power was needed to correct the frequency response to a desired target ROCOF of 1 Hz/s and nadir of above the under-frequency load shed (UFLS) limit of 58.6 Hz. In comparison, running 21 MW additional diesel units reduced the ROCOF to under 1 Hz/s, but could not maintain the nadir above the UFLS.
在孤岛电力系统中,无惯性发电(如光伏发电)对常规发电的取代,降低了剩余发电机组提供的频率响应对策的充分性。化学电池储能系统(BESS)提供补偿技术,如虚拟惯性响应(VIR)和基于下垂的主频率响应(PFR),可以提供纠正功率,以弥补增加的频率波动。本研究探讨了300兆瓦水电柴油交流岛电网将光伏发电水平提高到100兆瓦目标的频率波动,以及基于bess的VIR和PFR的纠正影响。在MATLAB-Simulink®中进行的分析表明,水电和柴油机组的联合调速器响应足够快,足以补偿聚合的光伏电站坡道,因此不需要BESS支持这种功率不平衡。分析大型水力发电机组损失时的频率波动,结果表明,系统转动惯量每发生一次单位变化,频率变化率(ROCOF)将变化约0.043 Hz/s,从0.48 Hz/s增加到超过1 Hz/s的目标ROCOF。在100兆瓦光伏水平下,最终ROCOF为1.24 Hz/s。在这种情况下,需要6.52 MW基于bess的VIR和PFR功率来校正频率响应,以达到1 Hz/s的期望目标ROCOF和高于58.6 Hz的低频负载衰减(UFLS)极限的最低点。相比之下,额外运行21兆瓦的柴油机组将ROCOF降低到1 Hz/s以下,但无法保持在UFLS以上的最低点。
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引用次数: 1
Indicator-based modified genetic approach for power network reconfiguration 基于指标的电网重构改进遗传方法
S. Eroshenko, A. Khalyasmaa, M. Senyuk, D. Snegirev
The paper presents a novel approach to power network reconfiguration, based on indicators and genetic optimization philosophy. The “fitness” of power network topology is estimated by the relative decrease o the total periodic short-circuit currents. Power losses, power transmission line lading, voltage levels are considered as constraints in order to ensure feasibility of the resulting topology of the network. The approach was verified using 118-bus fragment of the real regional power system and demonstrated high efficiency in comparison to the conventional genetic optimization.
本文提出了一种基于指标和遗传优化思想的电网重构新方法。电网拓扑的“适应度”由总周期短路电流的相对减小量来估计。为了保证所得到的网络拓扑的可行性,考虑了功率损耗、输电线路载重、电压等级等约束条件。通过实际区域电力系统的118母线片段验证了该方法的有效性,与传统的遗传优化方法相比具有较高的效率。
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引用次数: 0
Demonstration of the use of robotics in the development of a scrap processing model for mechatronic education 示范在机电一体化教育的废料处理模型的发展中使用机器人
I. Bula, E. Hajrizi, N. Kunicina
The role of demonstration of functional principles to students in education is very important, especially for engineering specialities. The usage of already known situations for students, as example environmental problems is a word vide challenge, and it could be used for education purposes. The technology development process has another side, as example a few year-old electronic product lives became suddenly short. This brings to an explosion and rapid acceleration in producing e-waste and solid waste. Waste and problems that they bring such as environmental and ecological problems are currently very well recognised among young generation, and they are familiar with that challenge from school. The education and awareness among people about the consequences of their actions is a basis for the arising creativeness, and to motivate students to involve themselves for the equipment designer's position. The career development path in the area of equipment design is basis for the entrepreneurship skills development, and it a good beginning for the motivation of students. The utilisation of e-waste is a good solution to brake psychological barrier, that students can do something wrong, as the creativeness well be based on low cost solutions. Education of new generations in order to change their behaviour regarding mechatronic scrap, is presented as a new approach of treating a mechatronic scrap. This is realized by building with students a few examples of autonomous mobile robots. This process of recycling was used to combine theoretical part with a practical one, in order to design and built robot from scrap. The Building Robots from scrap is in same time a starting point on how we can reuse mechatronic scrap, and how we can start from individual level to contribute in reduction of scrap.
功能原理的演示在教育中对学生的作用是非常重要的,特别是对工程专业。对于学生来说,使用已知的情况,例如环境问题,是一个单词视频挑战,它可以用于教育目的。技术发展过程也有另一面,比如几年前的电子产品寿命突然变短了。这导致电子废物和固体废物的产生呈爆炸式增长并迅速加速。现在的年轻一代已经很清楚垃圾及其带来的环境和生态问题,他们也很熟悉学校的挑战。人们对其行为后果的教育和意识是产生创造力的基础,并激励学生参与设备设计师的职位。装备设计领域的职业发展路径是创业技能发展的基础,是激发学生创业动力的良好开端。电子垃圾的利用是一个很好的解决方案,刹车心理障碍,学生可以做一些错误的,创造性的基础上,低成本的解决方案。对新一代进行教育,以改变他们对待机电报废的行为,是一种处理机电报废的新途径。这是通过与学生一起构建几个自主移动机器人的例子来实现的。利用这一回收过程,将理论部分与实际部分相结合,设计并制造了废旧机器人。从废料中建造机器人同时也是我们如何再利用机电废料的起点,以及我们如何从个人层面开始为减少废料做出贡献。
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引用次数: 1
期刊
2019 IEEE 60th International Scientific Conference on Power and Electrical Engineering of Riga Technical University (RTUCON)
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