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CSEE Journal of Power and Energy Systems 2022年第1期8卷 53-63页

作者： kaiqi sun Huangqing Xiao Yilu Liu University of Tennessee Knoxville College of Engineering Ringgold standard institution KnoxvilleTennesseeUnited States

In recent years,the interconnection of asynchronous power grids through the VSC-MTDC system has been proposed and extensively studied in light of the potential benefits of economical bulk power exchanges and frequency regulation reserves sharing.This paper proposes an optimized allocation method for sharing frequency regulation reserves among the interconnected power systems and the corresponding frequency regulation control of the VSC-MTDC system under emergency frequency deviation events.First,the frequency regulation reserve classification is proposed.In the classification,the available frequency response capacity reserves of each interconnection are divided into commercial reserves and regular reserves.While the commercial reserves are procured through long-term contracts,the regular reserves are purchased based on market prices of frequency regulation services.Secondly,based on the proposed frequency regulation reserve classification,a novel frequency regulation control is then introduced for the VSC-MTDC system.This control method could minimize the costs of the disturbed power grid for the needed frequency response supports from the other power grids.Simulation verifications are performed on a modified IEEE 39 bus system and a highly reduced power system model representing the North American grids.The simulation verification indicates that the developed frequency regulation control significantly reduced ancillary service costs of the disturbed power grid.

关键词： Frequency regulation control optimized reserve allocation response reserve classification VSC-MTDC

Low Voltage Direct Current Supply and Utilization System:Definition,Key Technologies and Development

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CSEE Journal of Power and Energy Systems 2023年第1期9卷 331-350页

作者： Zhao Ma Yahui Li Yuanyuan sun kaiqi sun School of Electrical Engineering Shandong UniversityJinan 250061China

With rapid increase of distributed solar power generation and direct current(DC)based loads such as data centers,electric vehicles(EVs),and DC household appliances,the development trend of the power system is changed from conventional alternate current(AC)to DC.Traditional AC power systems can scarcely meet the development demand of new DC trends,especially since both the generation side and load side are comprised of DC-based electronic power components.With this background,low voltage direct current supply and utilization system(LVDCSUS)has attracted more and more attention for its great advantages over an AC grid to overcome challenges in operation,reliability,and energy loss in renewable energy connection,DC load power utilization and a number of other aspects.However,the definition of the LVDCSUS is still not clear even though many demonstration projects have been put into planning and operation.In order to provide a clear description of LVDCSUS,first,the characteristics of LVDCSUS are illustrated in this paper to show the advance of the LVDCSUS.Second,the potential application scenarios of LVDCSUS are presented in this paper.Third,application of LVDCSUS technologies and some demonstration projects in China are introduced.Besides the development of the LVDCSUS,key technologies,including but not limited to planning and design,voltage levels,control strategies,and key equipment of LVDCSUS,are discussed in this paper.Finally,future application areas and the research orientations of LVDCSUS are analyzed.

关键词： Distributed energy resource information communication technology Internet of Things low voltage direct current supply and utilization system renewable energy

Attack Detection for Spoofed Synchrophasor Measurements Using Segmentation Network

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CSEE Journal of Power and Energy Systems 2022年第5期8卷 1327-1337页

作者： Wei Qiu Chengcheng Li Qiu Tang kaiqi sun Yilu Liu Wenxuan Yao College of Electrical and Information Engineering Hunan UniversityChangsha 410082China Department of Electrical Engineering and Computer Science University of TennesseeKnoxvilleTN37996USA Oak Ridge National Laboratory Oak RidgeTN37831USA

Synchrophasor measurements are essential to realtime situational awareness of the smart grid but vulnerable to cyber-attacks during the process of transmission and invocation.To ensure data security and mitigate the impact of spoofed synchrophasor measurements,this work proposes a novel object detection method using a Weight-based One-dimensional Convolutional Segmentation Network(WOCSN)with the ability of attack behavior identification and time localization.In WOCSN,automatic data feature extraction can be achieved by onedimensional convolution from the input signal,thereby reducing the impact of handcrafted features.A weight loss function is designed to distribute the contribution for normal and attack signals.Then,attack time is located via the proposed binary method based on pixel segmentation.Furthermore,the actual synchrophasor data collected from four locations are used for the performance evaluation of the WOCSN.Finally,combined with designed evaluation metrics,the time localization ability of WOCSN is validated in the scenarios of composite attacks with different spoofed intensities and time-sensitivities.

关键词： Data security spoofed synchrophasor measurements weight-based one-dimensional convolutional segmentation network(WOCSN)

新能源接入下配电系统混合储能选址定容优化策略研究

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太阳能学报 2024年第1期45卷 423-432页

作者：孙东磊赵龙孙凯祺王艳孙毅王耀国网山东省电力公司经济技术研究院济南250021 山东大学电气工程学院济南250061

为实现含分布式电源配电系统混合储能的选址定容,构建一种考虑混合储能特点的双层优化模型,从而提升配电网运行经济性和稳定性。首先,选取蓄电池和超级电容器构成混合储能系统接入配电系统,充分发挥混合储能的高效充放电和高能量吞吐;其... 详细信息

为实现含分布式电源配电系统混合储能的选址定容,构建一种考虑混合储能特点的双层优化模型,从而提升配电网运行经济性和稳定性。首先,选取蓄电池和超级电容器构成混合储能系统接入配电系统,充分发挥混合储能的高效充放电和高能量吞吐;其次,提出考虑混合储能特点的混合储能选址定容双层优化模型。上层优化以混合储能全寿命周期成本最小为目标,以配置容量和接入位置为优化变量,其中运行维护成本需由下层计算;下层优化以网损最小为目标,建立混合整数二阶锥潮流优化模型,并将规划结果反馈上层。最后,以IEEE 33节点配电系统为例,结果表明相较于单一储能,所提的混合储能形式及其优化配置策略能在保证配电网运行经济性的同时,提高配电网在可再生能源高比例接入下的运行稳定性。

关键词：可再生能源储能系统选址全寿命周期成本二阶锥规划配电系统

Cross-seam Hybrid MTDC System for Integration and Delivery of Large-scale Renewable Energy

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Journal of Modern Power Systems and Clean Energy 2021年第6期9卷 1352-1362页

作者： kaiqi sun Huangqing Xiao Jiuping Pan Yilu Liu University of Tennessee the Oak Ridge National Laboratory School of Electric Power Engineering South China University of Technology Hitachi ABB Power Grids Research

To better utilize the diversity of renewable energies in the U. S., this paper proposes a cross-seam hybrid multi-terminal high-voltage direct current(MTDC) system for the integration of different types of renewable energies in the U. S.Based on a developed station-hybrid converter design, the proposed hybrid MTDC system further investigates the connection methods of renewable energies and develops novel flexible power flow control strategies for realizing uninterrupted integration of renewable energies. In addition, the frequency response control of the hybrid MTDC system is proposed by utilizing the coordination between the converters in the hybrid MTDC system.The feasibility of the hybrid MTDC system and the performance of its corresponding control strategies are conducted in the PSCAD/EMTDC simulation. The simulation results indicate that the proposed hybrid MTDC system could realize the uninterrupted integration of renewable energies and flexible power transmission to both coasts of U.S.

关键词： Multi-terminal high-voltage direct current(MTDC)system cross-seam interconnection integration of large-scale renewable energies flexible power flow control frequency response control

Machine learning-based fast frequency response control for a VSC-HVDC system

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CSEE Journal of Power and Energy Systems 2021年第4期7卷 688-697页

作者： kaiqi sun Huangqing Xiao Shengyuan Liu Yilu Liu University of Tennessee KnoxvilleTN 37996USA University of Tennessee KnoxvilleTN 37996USA and also with the Oak Ridge National LaboratoryOak RidgeTN 37831USA

HVDC system can realize a very fast frequency response to the disturbed system under a contingency because its active power control is decoupled from the frequency deviation.However,most of existing HVDC frequency control strategies are coupled with system primary frequency control and secondary frequency control.Since the traditional system frequency control is dominated by the thermal generators,the advantage of the fast response of the HVDC system is not made fully used.The development of a frequency response estimation based on a machine learning algorithm provides another approach to improve the frequency response capability of the HVDC system.Different from other frequency deviation tracking strategies,a machine learning based HVDC frequency response control can directly increase the power flow of a HVDC system by estimation of the system generator or load lost.In this paper,a fast frequency response control using a HVDC system for a large power system disturbance based on the multivariate random forest regression(MRFR)algorithm is proposed.The simulation is carried out with an integrated power system model based on the North American interconnections.The simulation results indicate that the proposed MRFR based frequency response control can significantly improve the frequency low point during an event,while stabilizing the frequency in advance.

关键词： Frequency response control multivariate random forest regression VSC-HVDC system

基于源荷谐波耦合模型的数据驱动概率谐波潮流计算

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中国电机工程学报 2024年第11期44卷 4323-4334,I0012页

作者：李亚辉孙媛媛王庆岩丁磊孙凯祺刘洋程新功山东大学电气工程学院山东省济南市250061 国网山东省电力公司超高压公司山东省济南市250118 国网山东省电力公司电力科学研究院山东省济南市250002 济南大学自动化与电气工程学院山东省济南市250022

随着新能源及负荷中电力电子装置的广泛应用,电力系统谐波畸变程度不断增加。同时,新能源及负荷显著的不确定特征,进一步增加了谐波分析难度。为有效评估系统不确定谐波状态,充分挖掘源荷实际运行特征,提出一种数据驱动的概率谐波潮流(p... 详细信息

随着新能源及负荷中电力电子装置的广泛应用,电力系统谐波畸变程度不断增加。同时,新能源及负荷显著的不确定特征,进一步增加了谐波分析难度。为有效评估系统不确定谐波状态,充分挖掘源荷实际运行特征,提出一种数据驱动的概率谐波潮流(probabilistic harmonic power flow,PHPF)计算方法。首先,基于实测数据,建立考虑时变特性的源荷动态谐波耦合矩阵模型(dynamic harmonic coupling matrix model,DHCMM),揭示不同时段内谐波电压与谐波电流的相互耦合关系。然后,利用实测数据挖掘源荷时变不确定特征,采用改进点估计法提取统计特性,克服变量间相互影响引起的估计偏差。最后,提出针对源荷不确定性的PHPF计算方法,对系统中时变不确定谐波进行评估。实验结果表明,基于实测数据的谐波耦合矩阵模型能够有效分析谐波源时变特性,结合源荷时变不确定功率状态,所提PHPF计算方法能够对电力系统谐波进行准确评估。

关键词：数据驱动谐波耦合矩阵模型谐波评估概率谐波潮流(PHPF) 不确定特征

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城轨交通牵引供电系统电流与功率追踪研究

中国电机工程学报 2024年第6期44卷 2270-2278,I0015页

作者：米佳雨杨中平钟志宏林飞孙凯琦毛润前北京交通大学电气工程学院北京市海淀区100044

对于包含多个变电站的城轨牵引供电系统,在多车协同运行场景下,变电站、牵引列车、制动列车之间存在着复杂的能量交互。现有的潮流计算方法只关注于得到某时刻下各支路电流的大小,并未深入分析系统中各源(变电站和制动列车)与负荷(牵引... 详细信息

对于包含多个变电站的城轨牵引供电系统,在多车协同运行场景下,变电站、牵引列车、制动列车之间存在着复杂的能量交互。现有的潮流计算方法只关注于得到某时刻下各支路电流的大小,并未深入分析系统中各源(变电站和制动列车)与负荷(牵引列车和线路电阻)之间定量的电流及功率分配关系。该文基于电路理论,对城轨牵引供电系统中的电流分配情况进行上游追踪与下游追踪,定量表征源电流与负荷电流之间的比例关系;基于电流追踪的结果,对城轨牵引供电系统的功率分配进行上游追踪与下游追踪,得到源功率与负荷功率之间的具体分配系数。最后,通过算例分析验证所提潮流追踪算法的有效性和正确性。潮流追踪直观定量地展示了系统的功率流动路径,为后续优化储能系统容量配置和多储能系统间的协调控制提供理论支撑。

关键词：城市轨道交通电流追踪功率追踪节点电压方程上游追踪下游追踪

电感耦合等离子体质谱法测定紫砂陶器中24种元素迁移量

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卫生研究 2024年第2期53卷 294-299页

作者：孙开奇张楠赵婕王子怡王正赵榕北京市疾病预防控制中心北京市预防医学研究中心北京100013

目的建立电感耦合等离子体质谱法同时测定紫砂陶器在食品模拟物中24种元素迁移量的分析方法。方法紫砂茶壶、紫砂烧水壶、紫砂锅、紫砂电炖锅共4种紫砂陶器使用4%乙酸作为食品模拟物进行浸泡试验,使用电感耦合等离子体质谱法测定迁移液... 详细信息

目的建立电感耦合等离子体质谱法同时测定紫砂陶器在食品模拟物中24种元素迁移量的分析方法。方法紫砂茶壶、紫砂烧水壶、紫砂锅、紫砂电炖锅共4种紫砂陶器使用4%乙酸作为食品模拟物进行浸泡试验,使用电感耦合等离子体质谱法测定迁移液中24种元素迁移量。结果锂、镁、铝、铁、钡元素质量浓度在1000μg/L以内,铅、镉、总砷、铬、镍、铜、钒、锰、锑、锡、锌、钴、钼、银、铍、铊、钛、锶元素在100μg/L以内呈线性关系,r值为0.998739~0.999989。总汞在5.0μg/L以内呈线性关系,r值为0.995056。本方法所测元素的检出限为0.5~45.0μg/L,回收率为80.6%~108.9%,相对标准偏差为1.0%~4.8%(n=6)。对市售紫砂茶壶、烧水壶、砂锅、电炖锅共4种紫砂陶器检测发现,铍、钛、铬、镍、钴、锌、银、镉、锑、总汞、铊、锡、铜、总砷、钼、铅共16种元素迁移量结果低于定量限。迁移量最高的元素茶壶是铝、镁、钡;烧水壶是铝、镁;砂锅是铝、镁、锂;电炖锅是铝。结论该方法易于操作、准确度高,为紫砂陶器中元素迁移量测定及评价提供了一种有效可行的检测方法。

关键词：电感耦合等离子体质谱法紫砂陶器元素迁移量

Situation Projection Based on Multi-time-scale Recursive Dynamic State Estimation

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Situation Projection Based on Multi-time-scale Recursive Dyn...