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中国电机工程学会电力与能源系统学报（英文版）
中国电机工程学会
中国电机工程学会电力与能源系统学报（英文版）

中国电机工程学会

季度

2096-0042

jpes@csee.org.cn

010-82812971

北京市海淀区清河小鹰东路15号100192

中国电机工程学会电力与能源系统学报（英文版）/Journal CSEE Journal of Power and Energy SystemsCSCDCSTPCD北大核心SCI
查看更多>>《 CSEE电力与能源系统杂志》（JPES）致力于报道电力与能源系统领域学术研究的新发展。
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    Asymmetrical Fault Current Calculation Method and Influencing Factors Analysis of Droop-controlled Inverters

    Huimin ZhaoZhikang ShuaiJun GeAn Luo...
    562-573页
    查看更多>>摘要：Since the fault dynamic of droop-controlled inverter is different from synchronous generators(SGs),protection de-vices may become invalid,and the fault overcurrent may damage power electronic devices and threaten the safety of the microgrid.Therefore,it is imperative to conduct a comprehensive fault analysis of the inverter to guide the design of protection schemes.However,due to the complexity of droop control strategy,existing literatures have simplified asymmetric fault analysis of droop-controlled inverters to varying degrees.Therefore,accurate fault analysis of a droop-controlled inverter is needed.In this paper,by analyzing the control system,an accurate fault model is established.Based on this,a calculation method for instantaneous asymmetrical fault current is proposed.In addition,the current components and current characteristics are analyzed.It was determined that fault currents are affected by control loops,fault types,fault distance and nonlinear limiters.In particular,the influences of limiters on the fault model,fault current calculation and fault current characteristics were analyzed.Through detailed analysis,it was found that dynamics of the control loop cannot be ignored,the fault type and fault distance determine fault current level,and part of the limiters will totally change the fault current trend.Finally,calculation and experimental results verify the correctness of the proposed method.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Planning of DC Electric Spring with Particle Swarm Optimization and Elitist Non-dominated Sorting Genetic Algorithm

    Qingsong WangSiwei LiHao DingMing Cheng...
    574-583页
    查看更多>>摘要：This paper addresses the planning problem of parallel DC electric springs(DCESs).DCES,a demand-side management method,realizes automatic matching of power consumption and power generation by adjusting non-critical load(NCL)and internal storage.It can offer higher power quality to critical load(CL),reduce power imbalance and relieve pressure on energy storage systems(RESs).In this paper,a planning method for parallel DCESs is proposed to maximize stability gain,economic benefits,and penetration of RESs.The planning model is a master optimization with sub-optimization to highlight the priority of objectives.Master optimization is used to improve stability of the network,and sub-optimization aims to improve economic benefit and allowable penetration of RESs.This issue is a multivariable nonlinear mixed integer problem,requiring huge calculations by using common solvers.Therefore,particle Swarm optimization(PSO)and Elitist non-dominated sorting genetic algorithm(NSGA-Ⅱ)were used to solve this model.Considering uncertainty of RESs,this paper verifies effectiveness of the proposed planning method on IEEE 33-bus system based on deterministic scenarios obtained by scenario analysis.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    A Hybrid Signal Processing Method Combining Mathematical Morphology and Walsh Theory for Power Quality Disturbance Detection and Classification

    Zhi DingTianyao JiMengshi LiQ.H.Wu...
    584-592页
    查看更多>>摘要：In this paper,a novel signal processing method combining mathematical morphology(MM)and Walsh theory is proposed,which uses Walsh functions to control the structuring element(SE)and MM operators.Based on the Walsh-MM method,a scheme for power quality disturbances detection and classification is developed,which involves three steps:denoising,feature extraction and morphological clustering.First,various evolution rules of Walsh function are used to generate groups of SEs for the multiscale Walsh-ordered morphological operation,so the original signal can be denoised.Next,the fundamental wave of the denoised signal is suppressed by Hadamard matrix;thus,disturbances can be extracted.Finally,the Walsh power spectrum of the waveform extracted in the previous step is calculated,and the parameters of which are taken by morphological clustering to classify the disturbances.Simulation results reveal the proposed scheme can effectively detect and classify disturbances,and the Walsh-MM method is less affected by noise and only involves simple calculation,which has a potential to be implemented in hardware and more suitable for real-time application.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Transient Stability Analysis and Design of VSGs with Different DC-link Voltage Controllers

    Chao ShenWei GuWanxing ShengKeyan Liu...
    593-604页
    查看更多>>摘要：Virtual synchronous control has been widely studied for the advantages of emulating inertia for voltage source converters(VSCs).A constant dc-link voltage is usually assumed in existing literature to estimate transient stability of virtual synchronous generators(VSGs).However,actual power supply in the dc-side of VSGs is limited and different dc-link voltage controllers are needed to achieve power balance between DC side and AC side.Addition of dc-link voltage controller has great influence on transient behavior of VSGs,which has not been investigated by previous research.To fill this gap,this paper gives insights into the effect of dc-link voltage dynamics on transient stability of VSGs.First,two typical kinds of VSGs with dc-link voltage controllers are introduced.Then,mathematical models considering dc-link dynamics are established and the effect of dc-link voltage controllers on transient synchronization stability of VSGs is revealed through equal area criterion(EAC).It is found that dc-link voltage controller would reduce stability margin of VSGs and design-oriented transient stability analysis is carried out quantitively using critical clearing time(CCT).Finally,simulation results are given to validate correctness of theoretical analysis.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Two-stage Planning Method for Energy Router Considering Its Optimal Operation in Distribution Networks

    Meifu ChenMingchao XiaQifang Chen
    605-616页
    查看更多>>摘要：An energy router can effectively optimize the net-work loss and power quality of distribution networks.The optimal configuration of the energy router is relatively complex because issues dynamically influence each other,such as the location of the energy router,optimal number and capacity of its ports,and building new distribution lines for the ports.Presently,there has been very few research studies on the practical problems for the energy router.In this paper,a planning model of an energy router combined with the distribution network is established,which fully exploits the active and reactive power control abilities of the energy router to optimize the operation of the grid.The configuration problem is decoupled into two stages.The upper layer determines the location of the energy router and the parameters of the candidate new distribution lines for the ports.The lower layer calculates the optimal configuration of the energy router by minimizing the total annual cost.Because of the same rated bus voltage in the distribution network,the existing structure of the energy router is changed to be more applicable for the distribution network,and then the power flow model of the energy router is also modified.Due to the nonlinearity of the model,the planning model is converted into a mixed-integer second-order cone model to solve efficiently.In addition,some core factors influencing the optimal scheme of the energy router are also analyzed in this paper.Simulation results show that the optimal scheme of the energy router can significantly improve the economic deployment of the energy router,and optimize the network loss and power quality of the distribution network.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Convexification of Hybrid AC-DC Optimal Power Flow with Line-commutated Converters

    Hongyuan LiangZhigang LiJ.H.ZhengQ.H.Wu...
    617-628页
    查看更多>>摘要：Line-commutated converter(LCC)-based high-voltage DC(HVDC)systems have been integrated with bulk AC power grids for interregional transmission of renewable power.The nonlinear LCC model brings additional nonconvexity to optimal power flow(OPF)of hybrid AC-DC power grids.A convexification method for the LCC station model could address such nonconvexity but has rarely been discussed.We devise an equivalent reformulation for classical LCC station models that facilitates second-order cone convex relaxation for the OPF of LCC-based AC-DC power grids.We also propose sufficient conditions for exactness of convex relaxation with its proof.Equivalence of the proposed LCC station models and properties,exactness,and effectiveness of convex relaxation are verified using four numerical simulations.Simulation results demonstrate a globally optimal solution of the original OPF can be efficiently obtained from relaxed model.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Peer-to-Peer Trading in Distribution Systems with the Utility's Operation

    Xuanyi XiaoFeng WangMohammad ShahidehpourYujia Zhai...
    629-638页
    查看更多>>摘要：To realize a liberalized peer-to-peer(P2P)electricity market in distribution systems with network security,this paper develops a general framework for P2P trading in distribution systems with the utility's operation.The model is formulated as a bi-level programming.The utility's operation is an upper level problem,where a calculation method of network usage charges for P2P trading is also proposed.Peers'P2P trading is a lower level problem.An iterative algorithm based on analytical target cascading(ATC)is proposed to solve the model,where the interactions between utility and peers are presented.Numerical results on the IEEE 33-bus system demonstrate that the proposed method realizes a liberalized P2P market and ensures network security in distribution systems.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Dynamic Equivalent Modeling for Black-box Microgrids Under Multi-operating-point by Using LSTM

    Yunlu LiJosep M.GuerreroJunyou YangYajuan Guan...
    639-648页
    查看更多>>摘要：Since the high penetration of distributed energy sources complicates the dynamics of electrical power systems,accurate dynamic models are indispensable for study on the transient behavior of the microgrid(MG).In some practices,the lack of full detailed information results in failure of dif-ferential equation based dynamic modeling,which leads to a demand for a black-box MG modeling method.It is a critical challenge to maintain the effectiveness of the black-box model under a wide operating range and various fault conditions.In this paper,inspired by the mathematical equivalence between the recurrent neural network(RNN)and differential-algebraic equations(DAEs),a dynamic equivalent modeling method,using long short-term memory(LSTM),is presented to tackle this challenge.At first,the modeling equivalence and advantages of our basic idea are explained.Then,modeling procedures,including data preparation and design guidelines,are presented.Finally,the proposed method is applied to a multi-microgrid testing system for performance evaluation.The results,under various scenarios,reveal that the proposed modeling method has an adequate capability for representing the dynamic behaviors of a black-box MG under grid fault and operating point changing conditions.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    DC Traction Power Supply System Based on Modular Multilevel Converter Suitable for Energy Feeding and De-icing

    Lingxi HouShuqing ZhangYingdong WeiXiaoqian Li...
    649-659页
    查看更多>>摘要：A novel DC traction power supply system suitable for energy feeding and de-icing is proposed in this paper for an urban rail transit catenary on the basis of the full bridge submodule(FBSM)modular multilevel converter(MMC).The FBSM-MMC is a novel type of voltage source converter(VSC)and can directly control the output DC voltage and conduct bipolar currents,thus flexibly controlling the power flow of the urban rail transit catenary.The proposed topology can overcome the inherent disadvantages of the output voltage drop in the diode rectifier units,increase the power supply distance and reduce the number of traction substations.The flexible DC technology can coordinate multiple FBSM-MMCs in a wide area and jointly complete the bidirectional control of catenary power flow during the operation of the electric locomotive,so as to realize the local consumption and optimal utilization of the recovered braking energy of the train.In addition,the FBSM-MMCs can also adjust the output current when the locomotive is out of service to prevent the catenary from icing in winter.The working modes of the proposed topology are illustrated in detail and the control strategy is specially designed for normal locomotive operations and catenary de-icing.Simulation cases conducted by PSCAD/EMTDC validate the proposed topology and its control strategy.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据

    Multi-time Collaborative Restoration for Integrated Electrical-gas Distribution Systems Based on Rolling Optimization

    Jingyang YunZheng YanYun ZhouPeichao Zhang...
    660-671页
    查看更多>>摘要：This paper proposes a multi-time collaborative restoration model for integrated electricity-gas distribution sys-tems(IEGDSs)considering multiple resources after extreme weather events.Based on the linearized power flow constraints of the unbalanced electrical distribution system(EDS)and gas distribution system(GDS),this problem can be formulated as a mixed-integer linear programming(MILP)model.To improve the efficiency and veracity of the solution,a rolling optimiza-tion based two-stage method is developed with the first stage solved by a linear approximation model,and the second stage solved by real-time updated rolling optimization.By solving the MILP problem using rolling optimization,the proposed model and solution method achieve efficient and reliable collaborative restoration of IEGDS considering multiple resources and unbal-anced operation characteristics of EDS.The effectiveness of the proposed model and method is validated by using an IEGDS made of a 37-bus unbalanced EDS and 11-node GDS.
      原文链接:
    • 国家科技期刊平台
    • NETL
    • NSTL
    • 万方数据