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2020 5th IEEE Workshop on the Electronic Grid (eGRID)最新文献

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Electric Vehicle Charging Station Security Enhancement Measures 电动汽车充电站安全加强措施
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330666
Shahriar Saadat, Samantha Maingot, Sahba Bahizad
As the electric vehicle industry is growing, the security concerns for public charging stations is increasing for both manufacturers and consumers. A robust, well- uniformed process is essential to assess and enhance the current security measures and offer an executable mitigation plan. Security assessments of potential vulnerabilities should be performed more frequently due to technology changes as well as various parts being integrated into the infrastructure of both electric vehicle and charging station without security been considered. This paper discusses the implementation of the multi-layer authentication using ANPR and Loop technologies to provide an in-depth security and mitigate the cyber-attack risks for electric vehicle charging stations.
随着电动汽车行业的发展,汽车制造商和消费者对公共充电站的安全担忧也在增加。一个健壮的、统一的过程对于评估和增强当前的安全措施以及提供可执行的缓解计划是必不可少的。由于技术的变化以及在没有考虑安全性的情况下将各种部件集成到电动汽车和充电站的基础设施中,因此应该更频繁地对潜在漏洞进行安全评估。本文讨论了利用ANPR和Loop技术实现多层身份验证,为电动汽车充电站提供深度安全性,降低网络攻击风险。
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引用次数: 2
Smart Grid and Cybersecurity Challenges 智能电网和网络安全挑战
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330660
Shahriar Saadat, Sahba Bahizad, Thnwa Ahmed, Samantha Maingot
In the modern and computerized energy industry cyber security plays a critical role alongside physical security. The smart grid is considered as one of the leading revolutionary innovations in this industry with established solutions and engineering sciences that support the efficiency, flexibility and reliability of power, gas and water systems. A cybersecurity breach in this industry can have irreversible consequences resulting in disasters that threaten human life, along with more tradition consequences in security principles such as confidentiality, integrity and availability of the service or data. This paper seeks to describe the cyber security issues present in smart grids, including past challenges and their root causes, and proposes methodological approaches to protect the smart grid against cyber security attacks by proposing potential mitigating controls.
在现代和计算机化的能源工业中,网络安全与物理安全同等重要。智能电网被认为是该行业领先的革命性创新之一,它拥有成熟的解决方案和工程科学,可支持电力、天然气和水系统的效率、灵活性和可靠性。该行业的网络安全漏洞可能会产生不可逆转的后果,导致威胁人类生命的灾难,以及服务或数据的机密性、完整性和可用性等安全原则方面的更多传统后果。本文旨在描述智能电网中存在的网络安全问题,包括过去的挑战及其根本原因,并通过提出潜在的缓解控制措施,提出保护智能电网免受网络安全攻击的方法学方法。
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引用次数: 2
Evaluation of Predictive Direct Current and Direct Power Control for Grid-connected PV Systems 并网光伏系统预测直流和直流功率控制的评价
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330637
Mostafa Ahmed, Mohamed Abdelrahem, I. Harbi, R. Kennel
Predictive control provides many advantages over conventional control techniques. Thus, in this paper, a comparative study between the predictive direct current control (PDCC) and predictive direct power control (PDPC) is investigated. The study focuses on applying these control strategies with renewable energy systems (RESs), especially photovoltaic (PV) ones. RESs are integrated with high penetration into the grid, and they must satisfy certain regulations to sustain the grid stability. The studied system consists of a PV array and boost converter followed by two-level inverter to enable the grid connection, where the maximum power point tracking (MPPT) function is accomplished by an adaptive step-size method. The adopted technique here is perturb and observe (P&O) method. The control of active and reactive power is performed using PDPC and PDCC for the purpose of evaluation in terms of power quality, total harmonic distortion (THD), average switching frequency, implementation, calculation burden, etc. The system is validated by simulation results via Matlab platform under various operating conditions.
与传统控制技术相比,预测控制具有许多优点。因此,本文对预测直流控制(PDCC)和预测直接功率控制(PDPC)进行了比较研究。研究的重点是将这些控制策略应用于可再生能源系统,特别是光伏系统。RESs是电网的高渗透集成,必须满足一定的规则才能维持电网的稳定。该系统由光伏阵列和升压变换器组成,并网后由两电平逆变器组成,其中最大功率点跟踪(MPPT)功能通过自适应步长方法实现。这里采用的技术是扰动观察法(P&O)。利用PDPC和PDCC对有功和无功功率进行控制,从电能质量、总谐波失真(THD)、平均开关频率、实现、计算负担等方面进行评估。通过Matlab平台对系统在各种工况下的仿真结果进行了验证。
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引用次数: 2
Active Disturbance Rejection Controller with Virtual Impedance-based Current Limiter for Voltage Regulation of DC/DC Converters 基于虚拟阻抗限流器的DC/DC变换器电压调节自抗扰控制器
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330654
Asimenia Korompili, A. Monti
In this paper we integrate a virtual impedance-based current limiter (VICL) in the active disturbance rejection control (ADRC) employed for the voltage regulation of buck converters in MTDC systems. The ADRC voltage controller consists of a linear quadratic Gaussian (LQG) structure with reference trajectory generator. Small-signal stability analysis and time-domain simulations investigate the performance of this ADRC+VICL model. The VICL manages to limit the over-current of the converter without affecting the stability of the system. The converter achieves to exit the overcurrent limiting mode and enter the voltage control mode smoothly. The ADRC mitigates the interactions between different components in the system and stabilises it, thanks to the virtual disturbance, which represents the actual dynamics at the converter terminals. The beneficial performance characteristics of the ADRC+VICL model are also demonstrated through real-time simulations results.
本文将基于虚拟阻抗的限流器(VICL)集成到MTDC系统降压变换器的自抗扰控制(ADRC)中。ADRC电压控制器由线性二次高斯(LQG)结构和参考轨迹发生器组成。小信号稳定性分析和时域仿真研究了该ADRC+VICL模型的性能。VICL能够在不影响系统稳定性的情况下限制转换器的过电流。实现了变换器顺利退出过流限流模式,进入电压控制模式。ADRC减轻了系统中不同组件之间的相互作用,并稳定了系统,这要归功于虚拟扰动,它代表了变换器终端的实际动态。通过实时仿真结果验证了ADRC+VICL模型的有利性能特性。
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引用次数: 0
Control Strategies for Robust Low-Voltage Ride-Through Operation of Grid-Tied PV Inverters 并网光伏逆变器稳健性低压穿越运行控制策略
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330630
Jin Qiang, Terng-Wei Tsai, Lars Hagemann, Zhiqing Yang, Benedict J. Mortimer, R. D. De Doncker
This paper investigates the low-voltage ride-through (LVRT) operation of a grid-tied photovoltaic inverter system. To prevent over-rating operations, the conventional constant peak current strategy is usually implemented to limit the peak current amplitude considering the injected reactive current. However, this can lead to a dc-link energy imbalance due to the maximum-power-point tracking function. A short-term overshoot of the dc-link voltage can occur after grid voltage recovery. Abnormal oscillations can occur due to the nonlinear characteristics of the demand reactive current specified in grid codes. Moreover, mismatching injections of the reactive power can also occur due to the inaccurate voltage sag detections. To cope with the aforementioned issues, control strategies are proposed to guarantee robust LVRT operations. The proposed control methods are validated in simulations under different scenarios.
本文研究了并网光伏逆变器系统的低压穿越(LVRT)运行。考虑到注入的无功电流,通常采用传统的恒峰值电流策略来限制峰值电流幅值,以防止过载操作。然而,由于最大功率点跟踪功能,这可能导致直流链路能量不平衡。电网电压恢复后,直流电压可能出现短期超调。由于电网规范中规定的需求无功电流的非线性特性,会产生异常振荡。此外,由于电压暂降检测不准确,也可能出现无功功率注入不匹配的情况。针对上述问题,提出了保证LVRT鲁棒运行的控制策略。在不同场景下的仿真验证了所提出的控制方法。
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引用次数: 1
Demands for Bridging Power Electronics and Power System Engineering Concepts 桥接电力电子和电力系统工程概念的需求
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330663
S. Peyghami, F. Blaabjerg
Power electronics are becoming an underpinning technology for development of future electric energy systems. Proliferation of power converters will affect the dynamic and static performance of power systems. Thus, design, planning and operation of power systems should take into account the converter dynamics and also static models. Moreover, control, design and manufacturing of converters require considering their interactions with the entire power system performance. This paper highlights the importance of bridging power electronics and power system engineering concepts in future power systems. First, different concepts of power electronics and power system engineering is discussed. Afterwards, the necessity for bridging these two areas are explained. Finally, numerical case studies on a DC microgrid are provided for illustrating the needs for bridging these concepts.
电力电子技术正在成为未来电力能源系统发展的基础技术。电源变流器的激增将影响电力系统的动态和静态性能。因此,电力系统的设计、规划和运行既要考虑变流器的动态模型,也要考虑变流器的静态模型。此外,变流器的控制、设计和制造需要考虑它们与整个电力系统性能的相互作用。本文强调了在未来的电力系统中,桥梁电力电子学和电力系统工程概念的重要性。首先,讨论了电力电子学和电力系统工程的不同概念。然后,解释了连接这两个领域的必要性。最后,提供了直流微电网的数值案例研究,以说明桥接这些概念的需求。
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引用次数: 0
A Preventive Maintenance Planning Approach for Wind Converters 风电变流器的预防性维护计划方法
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330628
A. Davoodi, S. Peyghami, Yongheng Yang, T. Dragičević, F. Blaabjerg
Power Electronic (PE) converters are the heart of modern wind turbine systems, and their failures can significantly reduce turbine energy production. On the other hand, preventive maintenance, e.g., replacement of the components after a certain age, is an effective way to limit the converter unreliability. With that, this paper proposes an approach to find the optimal replacement time of components by quantifying and minimizing the total costs. The proposed framework is demonstrated on a 2-MW wind turbine system, where the outcomes are compared with Monte Carlo simulation results. Several factors are considered in this maintenance planning approach. By performing a sensitivity analysis, among them, repair rate, random-chance failure rate, scale parameter of the wear-out failure distribution, and the average price of electricity are identified as the key factors.
电力电子(PE)变流器是现代风力涡轮机系统的核心,其故障会显著降低涡轮机的发电量。另一方面,预防性维护,如在一定年限后更换元件,是限制变频器不可靠性的有效途径。在此基础上,提出了一种将总成本量化并最小化的方法来求解零件的最优更换时间。该框架在一个2mw风力发电系统上进行了验证,并与蒙特卡罗仿真结果进行了比较。在这种维护计划方法中要考虑几个因素。通过灵敏度分析,确定了其中的关键因素为返修率、随机故障率、磨损故障分布尺度参数和平均电价。
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引用次数: 2
Model Predictive Control with Switching Frequency Minimization for Modified Packed U-cell Inverter 改进型u单元逆变器开关频率最小的模型预测控制
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330665
I. Harbi, Mohamed Abdelrahem, Mostafa Ahmed, R. Kennel
In this paper, a finite control set model predictive control (FCS-MPC) for single-phase cascaded modified packed U-cell (MPUC) inverter is presented. The considered multilevel inverter (MLI) topology requires less number of switches and produces more levels in the output waveform compared to the conventional and recent ones. Two control objectives are achieved in the proposed control algorithm, reference current tracking and switching frequency minimization. The proposed FCS-MPC considers only the effective different vectors of the MPUC with eliminating the redundant states of the converter to reduce the computational effort of the algorithm. By minimizing a user-defined cost function, the developed FCS-MPC algorithm achieves low mean absolute reference tracking error of the grid current, high inverter voltage quality and low average switching frequency of the switches. The trade-off between the average switching frequency and the tracking performance with the voltage quality is studied to determine the suitable range of the weighting factor λn for the proposed system. Simulation results are presented using MATLAB/Simulink to verify the effectiveness of the control system.
提出了一种用于单相级联改良填料u单元逆变器的有限控制集模型预测控制(FCS-MPC)方法。考虑的多电平逆变器(MLI)拓扑需要更少的开关数量,并在输出波形中产生更多的电平与传统的和最近的。该控制算法实现了基准电流跟踪和开关频率最小化两个控制目标。本文提出的FCS-MPC只考虑MPUC的有效不同矢量,并消除了转换器的冗余状态,从而减少了算法的计算量。通过最小化用户自定义的代价函数,所开发的FCS-MPC算法实现了电网电流平均绝对参考跟踪误差低、逆变器电压质量高、开关平均开关频率低的目标。研究了平均开关频率和跟踪性能与电压质量之间的权衡,确定了该系统的加权因子λn的合适范围。利用MATLAB/Simulink给出了仿真结果,验证了控制系统的有效性。
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引用次数: 1
Converter-based Intelligent Transformer for Enhanced Grid Monitoring and Control 基于变换器的智能变压器增强电网监控
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330675
Moazzam Nazir, J. Enslin
The electric grid is rapidly evolving by incorporating advanced equipment that bears a variety of smart features in addition to their traditional functionalities. The power transformers are the most significant equipment in the substation and have been traditionally performing voltage conversion and isolation. However, the modern grid dynamics demand a variety of smart control features at strategic locations of the grid for which the most appropriate candidate are the transformers. Accordingly, the idea of solid-state transformers (SST) was conceived but they are still far from integration into grid due to their poor lifetime and reliability concerns. Also, the investment on existing infrastructure demands introduction of smart features into already installed traditional transformers. This paper proposes a converter-based intelligent transformer configuration that utilizes conventional transformers and introduces smart features into them through a power electronics-based module integrated between neutral and substation ground. The device introduces a variety of advanced features in traditional transformers that include voltage regulation, voltage balancing, harmonics isolation, supporting voltage ride through (VRT) capabilities of distributed energy resources (DERs) and avoiding grid collapse due to certain natural or man-made disturbances, such as, solar storms and high-altitude nuclear explosions. The proposed scheme is evaluated utilizing Typhoon hardware-in-the-loop (HIL-604) real-time simulator for a modified IEEE-9 bus benchmark system. The results verify the promising performance of the proposed scheme to enhance grid reliability, resiliency and power quality.
电网正在迅速发展,除了传统功能外,还采用了具有各种智能功能的先进设备。电力变压器是变电站中最重要的设备,传统上起着电压转换和隔离的作用。然而,现代电网动态要求在电网的战略位置具有各种智能控制功能,其中变压器是最合适的候选者。因此,固态变压器(SST)的想法被提出,但由于其寿命和可靠性问题,它们离并网还很遥远。此外,对现有基础设施的投资要求在已经安装的传统变压器中引入智能功能。本文提出了一种基于变流器的智能变压器配置,该配置利用传统变压器,并通过中性点和变电站地之间集成的基于电力电子的模块将智能特性引入变压器。该设备在传统变压器中引入了各种先进功能,包括电压调节、电压平衡、谐波隔离、支持分布式能源(DERs)的电压穿越(VRT)能力,以及避免由于某些自然或人为干扰(如太阳风暴和高空核爆炸)而导致电网崩溃。利用台风硬件在环(hill -604)实时模拟器对改进的IEEE-9总线基准系统进行了评估。结果验证了该方案在提高电网可靠性、弹性和电能质量方面的良好性能。
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引用次数: 1
Hardware development and validation of DC Circuit Breaker using counter-current injection method 采用逆流注入法的直流断路器的硬件开发与验证
Pub Date : 2020-11-02 DOI: 10.1109/eGRID48559.2020.9330365
Muhammad Maaz Qaiser, Ali Virdag
This paper presents development of hardware along with testing of DC (Direct Current) circuit breaker using counter current injection method [1]. The optimized implementation of the system is achieved using the simulation results of the DC circuit breaker topology. To analyze the behavior of prototype on high current, a test bench circuit is developed. The current and voltage sensors are used to sense various outputs during the realization of prototype. The data acquisition is done using LabView. The operating time of clearing fault current with different nature of loads has been discussed in this paper.
本文介绍了直流断路器的硬件开发以及用逆流注入法[1]对直流断路器进行测试。利用直流断路器拓扑的仿真结果,实现了系统的优化实现。为了分析样机在大电流下的性能,设计了一种试验台电路。在样机的实现过程中,使用电流和电压传感器来检测各种输出。数据采集使用LabView完成。讨论了不同性质负载的故障电流清除操作时间。
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引用次数: 0
期刊
2020 5th IEEE Workshop on the Electronic Grid (eGRID)
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