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Indices of Congested Areas and Contributions of Customers to Congestions in Radial Distribution Networks

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Journal of Modern Power Systems and Clean Energy 2022年第3期10卷 656-666页

作者： Jinping Zhao Ali Arefi Alberto Borghetti gerard ledwich College of Science HealthEngineeringand EducationMurdoch UniversityWA6150Australia Department of Electrical Electronicand Information EngineeringUniversity of BolognaBologna40126Italy School of Electrical Engineering and Robotics Queensland University of TechnologyBrisbaneQLD 4000Australia

Congestions are becoming a significant issue with an increasing number of occurrences in distribution networks due to the growing penetration of distributed generation and the expected development of electric *** congestion management(CM)policies and prices require proper indices of congested areas and contributions of customer to *** paper presents spatial and temporal indices for rapidly recognizing the seriousness of congestions from the perspectives of both magnitude violation and duration to prioritize the affected areas where CM procedures should be primarily ***,indices are presented which describe the contributions of customers to the *** tests on IEEE 123-bus and Australian 23-bus low-voltage distribution test feeders illustrate the calculation and capabilities of the proposed indices in balanced and unbalanced systems.

关键词： Congestion management spatial index temporal index distribution network contribution of customer

Measurement Sensitivity and Estimation Error in Distribution System State Estimation using Augmented Complex Kalman Filter

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Journal of Modern Power Systems and Clean Energy 2020年第4期8卷 657-668页

作者： Alan Louis gerard ledwich Geoff Walker Yateendra Mishra IEEE Queensland University of Technology BrisbaneAustralia

Distribution state estimation(DSE)is an essential part of an active distribution network with high level of distributed energy *** challenges of accurate DSE with limited measurement data is a well-known *** practice,the operation and usability of DSE depend on not only the estimation accuracy but also the ability to predict error *** paper investigates the application of error covariance in DSE by using the augmented complex Kalman filter(ACKF).The Kalman filter method inherently provides state error covariance *** can be utilized to accurately infer the error covariance of other parameters and provide a method to determine optimal measurement locations based on the sensitivity of error covariance to measurement noise *** paper also proposes a generalized formulation of ACKF to allow scalar measurements to be incorporated into the complex-valued *** proposed method is simulated by using modified IEEE 34-bus and IEEE 123-bus test feeders,and randomly generates the load data of complex-valued Wiener *** ACKF method is compared with an equivalent formulation using the traditional weighted least squares(WLS)method and iterated extended Kalman filter(IEKF)method,which shows improved accuracy and computation performance.

关键词： Augmented complex Kalman filter direct load flow distribution system state estimation error variance sensitivity analysis

Enhancing scalability of peer-to-peer energy markets using adaptive segmentation method

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Journal of Modern Power Systems and Clean Energy 2019年第4期7卷 791-801页

作者： Mohsen KHORASANY Yateendra MISHRA Behrouz BABAKI gerard ledwich Department of Electrical Engineering and Computer Science Queensland University of TechnologyBrisbaneAustralia Polytechnique Montréal MontréalCanada

This paper proposes an adaptive segmentation method as a market clearing mechanism for peer-to-peer(P2P)energy trading scheme with large number of market *** the proposed method,market players participate in the market by announcing their *** the first step,players are assigned to different segments based on their features,where the balanced k-means clustering method is implemented to form *** segments are formed based on the similarity between players,where the amount of energy for trade and its corresponding price are considered as features of *** the next step,a distributed method is employed to clear the market in each segment without any need to private information of *** novelty of this paper relies on developing an adaptive algorithm for dividing large number of market players into multiple segments to enhance scalability of the P2P trading by reducing data exchange and communication *** proposed approach can be used along with any distributed method for market *** this paper,two different structures including community-based market and decentralized bilateral trading market are used to demonstrate the efficacy of the proposed *** results show the beneficial properties of the proposed segmentation method.

关键词： Energy trading Market segmentation Distributed optimization Peer-to-peer(P2P)market Alternating direction method of multipliers

An Optimization Model for Reliability Improvement and Cost Reduction Through EV Smart Charging

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Journal of Modern Power Systems and Clean Energy 2024年第2期12卷 608-620页

作者： Jinping Zhao Ali Arefi Alberto Borghetti gerard ledwich School of Engineering and Energy Murdoch UniversityPerthAustralia Department of Electrical Electronicand Information EngineeringUniversity of BolognaBologna40126Italy School of Electrical Engineering and Robotics Queensland University of TechnologyBrisbaneQLD 4000Australia

There is a general concern that the increasing penetration of electric vehicles(EVs)will result in higher aging failure probability of equipment and reduced network *** electricity costs may also increase,due to the exacerbation of peak load led by uncontrolled EV *** paper proposes a linear optimization model for the assessment of the benefits of EV smart charging on both network reliability improvement and electricity cost *** objective of the proposed model is the cost minimization,including the loss of load,repair costs due to aging failures,and EV charging *** proposed model incorporates a piecewise linear model representation for the failure probability distributions and utilizes a machine learning approach to represent the EV charging *** two different test systems(a 5-bus network and the IEEE 33-bus network),this paper compares aging failure probabilities,service unavailability,expected energy not supplied,and total costs in various scenarios with and without the implementation of EV smart charging.

关键词： Aging failure electric vehicle(EV) EV charging power system reliability expected energy not supplied distribution network.

The operating schedule for battery energy storage companies in electricity market

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Journal of Modern Power Systems and Clean Energy 2013年第3期1卷 275-284页

作者： Shengqi ZHANG Yateendra MISHRA gerard ledwich Yusheng XUE Queensland University of Technology(QUT) BrisbaneAustralia State Grid Electric Power Research Institute NanjingChina

This paper presents a series of operating schedules for Battery Energy Storage Companies(BESC)to provide peak shaving and spinning reserve services in the electricity markets under increasing wind *** individual market participants,BESC can bid in ancillary services markets in an Independent System Operator(ISO)and contribute towards frequency and voltage support in the *** development in batteries technologies and availability of the day-ahead spot market prices would make BESC economically *** maximization of BESC is achieved by determining the optimum capacity of Energy Storage Systems(ESS)required for meeting spinning reserve requirements as well as peak *** spot market prices and frequency deviations from Australia Energy Market Operator(AEMO)are used for numerical simulations and the economic benefits of BESC is considered reflecting various aspects in Australia’s National Electricity Markets(NEM).

关键词： Battery energy storage systems Peak shaving Spinning reserve Energy market Ancillary services market

Electromechanical wave in power systems:theory and applications

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Journal of Modern Power Systems and Clean Energy 2014年第2期2卷 163-172页

作者： Yan XU Fushuan WEN gerard ledwich Yusheng XUE School of Electrical Engineering Zhejiang UniversityHangzhou 310027China Queensland University of Technology Gardens PointBrisbaneQLDAustralia State Grid Electric Power Research Institute Nanjing 210003China

The continuum model is a key paradigm describing the behavior of electromechanical transients in power *** the past two decades,much research work has been done on applying the continuum model to analyze the electromechanical wave in power *** this work,the uniform and non-uniform continuum models are first briefly described,and some explanations borrowing concepts and tools from other fields are ***,the existing approaches of investigating the resulting wave equations are *** application named the zero reflection controller based on the idea of the wave equations is next presented.

关键词： Power system Electromechanical wave propagation Continuum model Zero reflection controller

Small signal stability analysis of power systems with high penetration of wind power

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Journal of Modern Power Systems and Clean Energy 2013年第3期1卷 241-248页

作者： Ping HE Fushuan WEN gerard ledwich Yusheng XUE South China University of Technology Guangzhou 510640China Zhengzhou University of Light Industry Zhengzhou 450002China Queensland University of Technology Gardens PointBrisbaneAustralia State Grid Electric Power Research Institute Nanjing 210003China

The integration of large amount of wind power into a power system imposes a new challenge for the secure and economic operation of the *** is necessary to investigate the impacts of wind power generation on the dynamic behavior of the power system *** paper investigates the impacts of large amount of wind power on small signal stability and the corresponding control strategies to mitigate the negative *** concepts of different types of wind turbine generators(WTGs)and the principles of the grid-connected structures of wind power generation systems are first briefly ***,the state-of-the-art of the studies on the impacts of WTGs on small signal stability as well as potential problems to be studied are ***,the control strategies on WTGs to enhance power system damping characteristics are presented.

关键词： Wind turbine generators Wind farm integration Small signal stability Damping characteristic

采用桥电路与Chirp电压的频域介电谱测试技术

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中国电机工程学报 2015年第18期35卷 4790-4798页

作者：杨旭 NIELSEN Shawn ledwich gerard 昆士兰科技大学

频域介电谱响应测试技术广泛应用于评估变压器油纸绝缘系统的老化状态。为突出松弛极化过程及缩短测试时间，首次利用桥式电路和Chirp波形电压对现有的频域介电谱测试技术进行了改进。其中桥式电路用来消除几何电容的主导作用同时测量... 详细信息

频域介电谱响应测试技术广泛应用于评估变压器油纸绝缘系统的老化状态。为突出松弛极化过程及缩短测试时间，首次利用桥式电路和Chirp波形电压对现有的频域介电谱测试技术进行了改进。其中桥式电路用来消除几何电容的主导作用同时测量非瞬时极化过程的介电响应。桥电路的应用使虚导纳成为老化指标，即利于理解极化过程，又能简化系统辨识过程。该技术还采用扫频Chirp波形信号作为电压激励源来缩短测量时间，并设计 Chirp 匹配滤波器来提取Chirp信号的频域信息。测量结果表明，经桥电路测量的虚导纳能够作为老化指标来评估油纸绝缘系统老化状况，并且在10？4~1 Hz的频率范围内，测试仅耗时3.3 h，节省至少7 h测试时间。

关键词：频域介电谱测试油纸绝缘系统绝缘老化 Chirp波形激励虚导纳系统辨识

计及分布式电源和负荷静态特性的最优低频减载

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华南理工大学学报（自然科学版） 2011年第10期39卷 139-145页

作者：刘志鹏文福拴 gerard ledwich 华南理工大学电力学院广东广州510640 浙江大学电气工程学院浙江杭州310027 昆士兰科技大学工程系统系

低频减载被认为是当电力系统发生频率严重下降事故时所能采取的最后一项补救措施.针对配电系统中的低频减载问题,文中提出了计及分布式电源和负荷静态特性的最优低频减载策略.该策略以频率及频率变化率为执行依据,并由几个基本轮和一个... 详细信息

低频减载被认为是当电力系统发生频率严重下降事故时所能采取的最后一项补救措施.针对配电系统中的低频减载问题,文中提出了计及分布式电源和负荷静态特性的最优低频减载策略.该策略以频率及频率变化率为执行依据,并由几个基本轮和一个特殊轮组成.在基本轮中,按反馈控制律分轮次快速切除负荷,以保证频率摆脱紧急状态.而在特殊轮中,则优化分布式电源的出力和调整部分负荷,以保证频率恢复到安全状态并使系统运行参数最优.最后,以修改的IEEE 37节点配电系统为例来验证所提出的最优低频减载策略的有效性.

关键词：配电系统分布式电源低频减载基本轮特殊轮负荷静态特性