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Bi-level Optimal Planning of Voltage Regulator in Distribution Systems Considering Maximization of Incentive-based Photovoltaic Energy Integration

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CSEE Journal of Power and Energy Systems 2023年第6期9卷 2008-2017页

作者： Xu Xu Youwei Jia chun sing lai Minghao Wang Zhao Xu Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHung HomHong Kong SARChina Department of Electrical and Electronic Engineering University Key Laboratory of Advanced Wireless Communications of Guangdong ProvinceSouthern University of Science and TechnologyShenzhen 515100China Department of Electronic and Computer Engineering Brunel Institute of Power SystemsBrunel University LondonLondonUB83PH United Kingdom Department of Electrical Engineering Shenzhen Research InstituteThe Hong Kong Polytechnic UniversityHung HomHong Kong SARChina

This paper focuses on optimal voltage regulator(VR)planning to maximize the photovoltaic(PV)energy integration in distribution *** describe the amount of dynamic PV energy that can be integrated into the power system,the concept of PV accommodation capability(PVAC)is introduced and modeled with *** proposed planning model is formulated as a Benders decomposition based bi-level stochastic optimization *** the upper-level problem,VR planning decisions and PVAC are determined via mixed integer linear programming(MILP)before considering *** in the lower-level problem,the feasibility of first-level results is checked by critical network constraints(*** magnitude constraints and line capacity constraints)under uncertainties considered by time-varying loads and PV *** this paper,these uncertainties are represented in the form of operational scenarios,which are generated by the Gaussian copula theory and reduced by a well-studied backward-reduction *** modified IEEE 33-node distribution grid is utilized to verify the effectiveness of the proposed *** results demonstrate that a PV energy integration can be significantly enhanced after optimal voltage regulator planning.

关键词： Bi-level stochastic optimization problem critical network constraints photovoltaic energy integration uncertainties voltage regulator planning

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Robust N−k Security-constrained Optimal Power Flow Incorporating Preventive and Corrective Generation Dispatch to Improve Power System Reliability

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 351-364页

作者： Liping Huang chun sing lai Zhuoli Zhao Guangya Yang Bang Zhong Loi Lei lai School of Automation Guangdong University of TechnologyGuangzhou 510006China School of Automation Guangdong University of TechnologyGuangzhou 510006Chinaand also with the Department of Electronic and Electrical EngineeringBrunel University LondonLondonUB83PHUK Center for Electric Power System and Energy Department of Electrical EngineeringTechnical University of DenmarkKongens Lyngby 2800Demark Zhaoqing Power Supply Bureau Guangdong Power Grid CompanyChina Southern Power GridZhaoqing 526020China

As extreme weather events have become more frequent in recent years,improving the resilience and reliability of power systems has become an important area of *** this paper,a robust preventive-corrective security-constrained optimal power flow(RO-PCSCOPF)model is proposed to improve power system reliability under N−k *** the short-term emergency limit(STL)and the long-term operating limit(LTL)of the post-contingency power flow on the branch are *** with the existing robust corrective SCOPF model that only considers STL or LTL,the proposed ROPCSCOPF model can achieve a more reliable generation dispatch *** addition,this paper also summarizes and compares the solution methods for solving the N−k SCOPF *** computational efficiency of the classical Benders decomposition(BD)method,robust optimization(RO)method,and line outage distribution factor(LODF)method are investigated on the IEEE 24-bus Reliability Test System and 118-bus *** results show that the BD method has the worst computation *** RO method and the LODF method have comparable ***,the LODF method can only be used for the preventive SCOPF and not for the corrective *** RO method can be used for both.

关键词： Benders cut bender decomposition line outage distribution factor N−k security criterion optimal power flow power system reliability resilience robust optimization

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A retroactive approach to microgrid real-time scheduling in quest of perfect dispatch solution

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Journal of Modern Power Systems and Clean Energy 2019年第6期7卷 1608-1618页

作者： Youwei JIA Xue LYU chun sing lai Zhao XU Minghua CHEN Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhenChina Department of Electrical Engineering The Hong Kong Polytechnic UniversityHong KongChina Department of Electrical Engineering School of AutomationGuangdong University of TechnologyGuangzhouChina School of Civil Engineering Faculty of EngineeringUniversity of LeedsLeedsUK The Chinese University of Hong Kong Hong KongChina

As an emerging paradigm in distributed power systems,microgrids provide promising solutions to local renewable energy generation and load demand ***,the intermittency of renewables and temporal uncertainty in electrical load create great challenges to energy scheduling,especially for small-scale *** of deploying stochastic models to cope with such challenges,this paper presents a retroactive approach to real-time energy scheduling,which is prediction-independent and computationally *** case studies were conducted using 3-year-long real-life system data,and the results of simulations show that the cost difference between the proposed retroactive approach and perfect dispatch is less than 11%on average,which suggests better performance than model predictive control with the cost difference at 30%compared to the perfect dispatch.

关键词： Microgrid Renewables Real-time scheduling Perfect dispatch Grid integration

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Electric Vehicle Charging Scheduling Strategy for Supporting Load Flattening Under Uncertain Electric Vehicle Departures

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Journal of Modern Power Systems and Clean Energy 2023年第5期11卷 1634-1645页

作者： Han Wang Mengge Shi Peng Xie chun sing lai Kang Li Youwei Jia IEEE Department of Electrical and Electronic Engineering Southern University of Science and TechnologyShenzhen 518055China School of Electronic and Electrical Engineering University of LeedsLeedsLS29JTUK Brunel Interdisciplinary Power Systems Research Centre Department of Electronic and Electrical EngineeringBrunel University LondonLondon UB83PHUK

The scheduled electric vehicle(EV)charging flexibility has great potential in supporting the operation of power systems,yet achieving such benefits is challenged by the uncertain and user-dependent nature of EV charging *** research primarily focuses on modeling the uncertain EV arrival and battery status yet rarely discusses the uncertainty in EV *** this paper,we investigate the EV charging scheduling strategy to support load flattening at the distribution level of the utility grid under uncertain EV departures.A holistic methodology is proposed to formulate the unexpected trip uncertainty and mitigate its negative *** ensure computational efficiency when large EV fleets are involved,a distributed solution framework is developed based on the alternating direction method of multipliers(ADMM)*** numerical results reveal that unexpected trips can severely damage user convenience in terms of EV energy *** is further confirmed that by applying the proposed methodology,the resultant critical and sub-critical user convenience losses due to scheduled charging are reduced significantly by 83.5%and 70.5%,respectively,whereas the load flattening performance is merely sacrificed by 17%.

关键词： Electric vehicle(EV) EV fleet uncertain departure user convenience distributed solution

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Modeling,Oscillation Analysis and Distributed Stabilization Control of Autonomous PV-based Microgrids

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 921-936页

作者： Zhuoli Zhao Jindian Xie Shaoqing Gong Xi Luo Yuewu Wang chun sing lai Ping Yang Loi Lei lai Josep M.Guerrero Department of Electrical Engineering School of AutomationGuangdong University of TechnologyGuangzhou 510006China School of Automation Guangxi University of Science and TechnologyLiuzhou 545006China Department of Electronic and Electrical Engineering Brunel University LondonLondon UB83PHUK Key Laboratory of Clean Energy Technology of Guangdong Province South China University of TechnologyGuangzhou 510640China Department of Energy Technology Aalborg University9220 AalborgDenmark

Driven by rising energy demand and the goal of carbon neutrality,renewable energy generations(REGs),especially photovoltaic(PV)generations,are widely used in the urban power energy *** the intelligent control of microgrids(MG)brings economic and efficient operation,its potential stability problem cannot be *** date,most of the research on modeling,analyzing and enhancing the stability of MG usually assume the DC-link as an ideal voltage ***,this practice of ignoring the dynamics of DC-link may omit the latent oscillation phenomena of autonomous PV-based ***,this paper establishes a complete dynamic model of autonomous PV-based MG including PV panels and *** from previous conclusions of idealizing DC-link dynamics,participation factor analysis finds the potential impact of DClink dynamics on system dynamic performance,and different influence factors including critical control parameters and nonlinear V-I output characteristic of PV array are considered to further reveal oscillation ***,based on the average consensus algorithm,a distributed stabilization controller with strong robustness is proposed to enhance stability of the PVbased MG,which does not affect the steady-state performance of the ***,the correctness of all theoretical analysis and the effectiveness of the proposed controller are verified by time domain simulation and hardware-in-loop tests.

关键词： Average consensus algorithm distributed stabilization microgrid oscillation photovoltaic(PV)generation stability analysis

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single Image Super-Resolution via the Implementation of the Hardware-Friendly Sparse Coding

Single Image Super-Resolution via the Implementation of the ...

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第37届中国控制会议

作者： Zhekang Dong chun sing lai Zhao Xu Donglian Qi College of Electrical Engineering Zhejiang University Department of Electrical Engineering The Hong Kong Polytechnic University Department of Engineering Science University of Oxford

Sparse representation is one of the effective approaches to perform the feature extraction on the high-dimensional signals and has been widely used in the field of image processing. In this paper, a novel single image super-resolution（SR） reconstruction algorithm based on sparse coding is presented. Specifically, due to the fact that sparse coding has the potential to greatly facilitate the biological-neural system and to deal with a large amount of complex data, while consuming a finite amount of energy, a memristor crossbar array synthesized by a threshold-type memristor model is constructed for the implementation of a hardware-friendly sparse coding method, i.e., the Locally Competitive Algorithm（LCA）. Meanwhile, the relevant online dictionary learning method is provided, along with the description of weight programming strategy. Furthermore, the specific description of the image SR via the LCA sparse coding is provided. For the verification purpose, a series of experiments are carried out to illustrate the validity and effectiveness of the entire scheme.

关键词： Image super-resolution sparse coding memristor crossbar array dictionary learning

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主动配电网中以数据为中心的能源生态系统（英文）

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南方电网技术 2017年第10期11卷 45-61页

作者：董朝阳罗逢吉赖俊升赖来利新南威尔士大学电力工程与通信学院悉尼大学土木工程学院牛津大学工程科学系广东工业大学自动化学院广州510006

近年来随着一些新兴技术的涌现,现代配电系统不断集成大规模分布式能源、先进通信技术、计算与控制技术,并快速演变成为复杂的物理-信息系统,即为"主动配电网"。本文对构建主动配电网中面向数据的能源生态系统进行了展望,给出了能源生... 详细信息

近年来随着一些新兴技术的涌现,现代配电系统不断集成大规模分布式能源、先进通信技术、计算与控制技术,并快速演变成为复杂的物理-信息系统,即为"主动配电网"。本文对构建主动配电网中面向数据的能源生态系统进行了展望,给出了能源生态系统的定义与关键特征。为支撑能源生态系统的构建,特别提出了一个分布式、面向数据的信息-物理基础设施,同时讨论了该基础设施能够向主动配电网提供的多维度服务模型和交互环境。最后,本文提出了可构建在信息-物理基础设施之上的数据应用,这些可作为未来的研发方向。

关键词：能源生态系统主动配电网智能电网能源互联网大数据

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Syntheses,structures,and reactivity of ruthenium(Ⅱ) hydride complexes containing Klui's oxygen tripodal ligand

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Science China Chemistry 2010年第10期53卷 2139-2143页

作者： NG Ho-Yuen lai chun-sing WILLIAMS Ian D. LEUNG Wa-Hung Department of Chemistry The Hong Kong University of Science and Technology

Treatment of Ru(CO)(Cl)(H)(PPh3)3 with NaLOEt (LOEt-= [CpCo{P(O)(OEt)2}3]-) afforded the hydride complex (PPh3)(CO)-LOEtRu(H) (1), which has been characterized by X-ray crystallography. Similarly, the tricyclohexylphosphine analogue, (PCy3)(CO)LOEtRu(H) (2), was synthesized from Ru(CO)Cl(H)(PCy3)2 and NaLOEt. Treatment of complex 1 with R'SO2N3 afforded the (arylsulfonyl)amido complexes LOEtRu(CO)(PPh3)(NHSO2R) (R = 2,4,6-i-Pr3C6H2 (3), 4-t-BuC6H4 (4)). The crystal structure of complex 3 has been determined. The Ru-N distance and Ru-N-S angle in 3 are 2.076(3) and 126.14(16)°, respectively. Reactions of complex 1 with acids have been studied.

关键词： ruthenium oxygen tripodal ligand hydride complex (arylsulfonyl)amido complex

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A Criterion for Elliptic Curves with Second Lowest 2-Power in L(1)(Ⅱ)

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Acta Mathematica Sinica,English Series 2005年第5期21卷 961-976页

作者： chun lai ZHAO LMAM School of Mathematical Sciences Peking University Beijing 100871 P. R. China

Let D = p1p2 …pm, where p1,p2, ……,pm are distinct rational primes with p1 ≡p2 ≡3（mod 8）, pi =1（mod 8）（3 ≤ i ≤ m）, and m is any positive integer. In this paper, we give a simple combinatorial criterion for the value of the complex L-function of the congruent elliptic curve ED2 ： y^2 = x^3- D^2x at s = 1, divided by the period ω defined below, to be exactly divisible by 2^2m-2, the second lowest 2-power with respect to the number of the Gaussian prime factors of D. As a corollary, we obtain a new series of non-congruent numbers whose prime factors can be arbitrarily many. Our result is in accord with the predictions of the conjecture of Birch and Swinnerton-Dyer.

关键词： Elliptic curve L-function Congruent number BSD conjecture

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DEFORMATION OF COPOLYMER MICELLES INDUCED BY AMPHIPHILIC DIMER PARTICLES

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Chinese Journal of Polymer Science 2012年第2期30卷 164-172页

作者： Xiao-chun Qin chun-lai Ren National Laboratory of Solid State Microstructures Nanjing UniversityNanjing 210093China

Combining self-consistent-field theory and density-functional theory, we systematically study the deformation of copolymer micelles induced by the presence of amphiphilic dimer particles. Due to the amphiphilic nature, dimer particles tend to accumulate onto the interface of the copolymer micelle. With increasing concentration of the symmetric dimer particles, which are made of two identical spherical particles, the micelle deforms from the initial sphere to ellipse, dumbbell, and finally separates into two micelles. Furthermore, asymmetric dimer particles, composed by two particles with different sizes, are considered to investigate the influence of geometry of dimer particles on the deformation of the micelle. It is found that the micelle inclines to deform into dumbbell due to the additional curvature originating in the gathering of asymmetric dimer particles onto the interface of the micelle. The present study on the deformation of micelles is useful to understand the possible shape variation in the course of cell division/fusion.

关键词： Dimer particle Copolymer micelle Deformation Self consistent field theory Density function theory.

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