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Control Parameters Design Procedure for Multi-Converters DC Power System Considering Dynamic Interaction Between Converters

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CSEE Journal of Power and Energy Systems 2025年第2期11卷 724-738页

作者： Xueshen Zhao Lin Zhu Li Guo Xialin Li Zhi Wang Hao Lu Chengshan Wang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China

Due to dynamic interaction between converters, design of control parameters of multi-converters medium-voltage DC (MVDC) power system is much more complicated than of a single-converter situation. Open-loop and closed-loop transfer functions considering control-loops dynamic interaction between converters are developed, which are suitable for studying influence of control parameters on system stability. With the above transfer functions, a system-level control parameter design proce-dure for dynamic stability (e.g., oscillation frequency and damping factor) of system is proposed. If there are many converters, computational burden of system-level control parameters design procedure will be huge. For this reason, a control parameter sharing method is further proposed in this paper, which is based on dynamic interaction mechanism between converters. In this sharing method, control parameters of equivalent reduced-order model of the system are shared with each converter, so calculation burden of control parameters of system is reduced significantly. Consequently, dynamic stability of the system can be designed by equivalent reduced-order model. Experiments are conduced to validate the system-level control parameter design procedure.

关键词： Control parameters design procedure dynamic interaction medium-voltage DC(MVDC)power system sharing principle

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Data-Driven Distributionally Robust Energy and Reserve Scheduling Considering RES Flexibility

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IEEE Transactions on Power Systems 2025年第3期40卷 2438-2450页

作者： Wang, Haoyuan Bie, Zhaohong Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Province Key Laboratory of Smart Grid Xi'an710049 China

The growing penetration of variable renewable energy sources (RES) greatly increases uncertainty in the power system, and more flexibility is required to maintain the balance between power generation and consumption. Compared with costly investments in other resources, RES themselves can also be a promising source of flexibility, by providing balancing reserves through deloaded control. This paper proposes an economic dispatch scheme that allows variable RES to provide reserves, so that they can offer flexibility to balance the uncertainty from themselves and other variable resources. The model is versatile and considers different RES reserve control strategies and activation schemes. A data-driven distributionally robust chance-constrained (DD-DRCC) method is proposed to manage uncertainty from RES. Knowledge of variation ranges and probability distributions is captured in the data-driven uncertainty model. The adequacy, availability and deliverability of reserves in the re-dispatch stage are guaranteed by joint chance constraints. The model is transformed into a linear programming problem using conditional value-at-risk (CVaR) and solved efficiently. A case study confirms the effectiveness of the proposed method, and shows that it can achieve a balance between reliability and economy compared with existing approaches. © 1969-2012 IEEE.

关键词： Uncertainty Generators Real-time systems Wind farms Renewable energy sources Power transmission lines Optimization

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Sensitivity-Based Heterogeneous Ordered Multi-Agent Reinforcement Learning for Distributed Volt-Var Control in Active Distribution Network

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IEEE Transactions on smart grid 2025年第3期16卷 2115-2126页

作者： Zheng, Xiaodong Yu, Shixuan Cao, Hui Shi, Tianzhuo Xue, Shuangsi Ding, Tao Xi’an Jiaotong University Shaanxi Key Laboratory of Smart Grid State Key Laboratory of Electrical Insulation and Power Equipment School of Electrical Engineering Xi’an710049 China

As power grids expand, maintaining stable voltage and minimizing losses become increasingly crucial. Meanwhile, the widespread use of heterogeneous devices in modern distribution systems necessitates effective multi-device coordination. This issue is exacerbated by the integration of intermittent renewable sources (e.g., solar and wind), which introduce voltage fluctuations. To tackle these challenges, this paper proposes a novel Sensitivity-based Heterogeneous Ordered Multi-agent Reinforcement Learning (SHOM) method for Volt-Var Control (VVC) in Active Distribution Networks (ADNs). By leveraging voltage-reactive sensitivity to explicitly guide sequential policy updates, SHOM ensures a monotonic improvement in control strategies under heterogeneous, networked constraints. Experimental results on IEEE test feeders demonstrate that the proposed approach achieves superior voltage regulation and lower power losses compared to existing methods. © 2010-2012 IEEE.

关键词： Power distribution networks

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Leveraging Electric Vehicles for Enhancing Power System Resilience: A Review of Strategies and Challenges

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Current Sustainable/Renewable Energy Reports 2025年第1期12卷 1-8页

作者： Pang, Songling Liu, Cong Zhang, Chenjia Zhang, Jinxi Zhang, Hongcai Joint Laboratory of Smart Grid and lsland Microgrid Electric Power Research Institute of Hainan Power Grid Co. Ltd Haikou China Zhuhai UM Science & Technology Research Institute Zhuhai China University of Macau State Key Laboratory of Internet of Things for Smart City China

Background: The increasing occurrence of extreme weather events and the rapid growth of renewable energy penetration are challenging the resilience of modern power systems. Electric vehicles (EVs), due to their bidirectional energy capabilities, present a novel opportunity to enhance power system resilience in both normal and emergency scenarios. Objective: This study aims to systematically review the potential of EVs, particularly through Vehicle-to-grid (V2G) technology, in enhancing power system resilience. The paper seeks to understand their applications in grid services, pre-disaster planning, and disaster response, while identifying associated technical, economic, and policy challenges. Methods: A comprehensive literature review was conducted, examining recent studies and pilot projects on EV integration into power systems. The review categorizes the findings into four strategic areas: V2G in non-crisis conditions, pre-disaster planning, emergency response, and policy frameworks. The paper also discusses commonly used resilience assessment metrics and proposes directions for future research. Results: EVs have demonstrated significant contributions to frequency and voltage regulation, peak shaving, black start capability, and disaster recovery. Pre-disaster coordination strategies, including hierarchical and two-stage optimization frameworks, have shown effectiveness in enhancing grid flexibility and critical load restoration. Policy mechanisms such as dynamic pricing and equitable incentive schemes play a pivotal role in encouraging EV participation in resilience services. Conclusion: EVs offer significant promise as distributed energy resources for enhancing power system resilience. Their effective integration requires not only supportive infrastructure and regulatory frameworks but also solutions to key challenges such as battery degradation, economic viability, and policy uncertainty. Future research should focus on developing scalable coordination strategi

关键词： Vehicle-to-grid

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Unilateral Compensation for Compact and Lightweight IPT Converters with Near Unity Power Factor and Load-Independent Constant Output

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IEEE Transactions on Power Electronics 2025年第7期40卷 10189-10197页

作者： Guo, Zhihao Qu, Xiaohui Liu, Jinghang Li, Yundi Tse, Chi K. Southeast University School of Electrical Engineering Nanjing210096 China Jiangsu Key Laboratory of Smart Grid Technology and Equipment Nanjing210096 China City University of Hong Kong Department of Electrical Engineering Hong Kong

In many application scenarios, inductive power transfer (IPT) converters are expected to be compact and lightweight, especially in the charging device side. The unilateral compensation is an effective solution to eliminate the bulky passive inductors and capacitors. However, most existing unilateral compensation topologies in IPT converters cannot achieve multiple design objectives simultaneously, such as unity power factor (UPF), load-independent constant output, soft switching, and so on. This article starts from a generalized transformer model and proposes the design principle for unilateral compensation networks in terms of flexible constant-voltage or constant-current output while combating the parameter constraint of the given loosely coupled transformer. In addition, the near UPF and soft switching can be simultaneously achieved to improve the transfer efficiency. Based on the design principle, a family of unilateral compensation topologies is proposed and the design process is detailed. Finally, a 100-W prototype of CLC-N(none) compensated IPT converter is built to verify the design. © 1986-2012 IEEE.

关键词： Inductive power transmission

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Fabrication and performance optimization of BNT-based piezo-actuators via vat photopolymerization for actuating application

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Ceramics International 2025年第12期51卷 15322-15330页

作者： Zhai, Di Zhao, Lianzhong Zhang, Qiang Chen, Chuan Chen, Siyang Ju, Dengfeng Yuan, Xi Zhou, Xuefan Zhang, Dou State Key Laboratory of Powder Metallurgy Central South University Hunan Changsha410083 China Electric Power Intelligent Sensing Technology and Application State Grid Corporation Joint Laboratory State Grid Smart Grid Research Institute Co. Ltd. Beijing102200 China State Grid Ningxia Ultrahigh Voltage Company Ningxia 750011 China Chemistry and Chemicl Engineering Central South University Changsha Hunan 410083 China

Lead-free Bi0.5Na0.5TiO3-based ceramics are considered as ideal materials for small actuators due to their high electric-field-induced strain, large driving force, and rapid response speed. However, ceramics with complex-structures are difficult to be prepared using traditional processing methods, which limits their application for actuation. In this study, 0.99(0.76Bi0.5Na0.5TiO3-0.24SrTiO3)-0.01NaNbO3 ceramics were successfully fabricated using vat photopolymerization (VPP) technology. The effects of sintering temperature on the phase composition, microstructure, and electrical properties of the printed ceramics were investigated. The optimal field-induced strain of 0.26 % was observed at 4 kV/mm, with a large-signal piezoelectric strain coefficient d33∗ of 664 p.m./V. A small-sized bending actuator was printed, capable of driving a stainless-steel cantilever beam to achieve a tip displacement of 3.32 mm and achieving an equivalent driving force of 15.02 N. These results demonstrate that VPP technique is suitable for fabricating piezoceramic actuators with high-precision and complex-structures. © 2025 Elsevier Ltd and Techna Group S.r.l.

关键词： Sintering

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A Novel Harmonic State-space Modelling Method on the Modular Multilevel Matrix Converter and Coupling Analysis

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CSEE Journal of Power and Energy Systems 2025年第1期11卷 78-90页

作者： Jing Li Boyang Zhao Shenquan Liu Jie Li Xiuli Wang Xifan Wang Shaanxi Key Laboratory of Smart Grid in Xi'an Jiaotong University School of Electrical EngineeringXi'an Jiaotong UniversityXi'an710049China School of Electric Power Engineering South China University of TechnologyGuangzhou510641China

The fractional frequency transmission system is an emerging technology for long-distance wind power integration,and the modular multilevel matrix converter(M3C)is the keen *** the M3C directly connects two ac grids with different frequencies,the external and internal harmonics have complex coupling relationships with a unique dual-fundamental-frequency spectrum,which has not been properly investigated due to a lack of an effective *** address this issue,a novel harmonic state-space method is proposed to achieve comprehensive modelling of the harmonic dynamics of the *** on the principle of two-dimensional Fourier transform,the decomposition of the dual-fundamental-frequency harmonics is realized,and the multiplicative coupling between time-domain variables is modelled through double-layer convolution on the frequency ***,the general expression of the proposed method is provided,which highlights a modularized matrix with easy scalability to meet different truncation ***,the HSS model of M3C considering the close-loop control is established,based on which a panoramic harmonic coupling relationship between the system-and the low-frequency side is ***,the M3C model and harmonic coupling relationship are validated by simulation tests conducted in MATLAB/Simulink environment.

关键词： Harmonic state-space harmonic transmission modular multilevel matrix converter.Harmonic state-space harmonic transmission modular multilevel matrix converter

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Incidence Matrix based Method for N−1 Contingency Parallel Analysis of Main Transformers in Distribution Networks

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CSEE Journal of Power and Energy Systems 2025年第2期11卷 705-713页

作者： Qiubo Zou Fengzhang Luo Tianyu Zhang Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China Economic and Technology Research Institute State Grid Tianjin Electric Power CompanyTianjin 3000171China

N−1 security is an important criterion for the development and planning of distribution *** existing N−1 contingency analysis methods of distribution networks are primarily based on the unit of components,and the faults of each component are analyzed and verified one by *** calculation process of these methods is complicated,and the positioning effect of the weak links needed for distribution network planning is *** this reason,this paper proposes a method of N−1 contingency parallel analysis for main transformers based on the incidence ***,the main transformer incidence matrix is established,and the load transfer process is classified into three types,according to different transfer modes,and the contact matrices are then established ***,considering the capacity constraint of main transformers and tie-lines,the corresponding capacity matrices are *** maximum transfer capability(MTC)of the distribution network in the case of each main transformer fault is calculated by contact matrices and capacity matrices,and the N−1 contingency analysis result is obtained by comparing MTC with the load that needs ***,the transfer margin of the main transformers and tie-lines after transferring can be obtained in the process of N−1 contingency analysis,so as to find any weak *** example is given to verify the correctness and effectiveness of the proposed *** this paper,the N−1 contingency analysis results of all main transformers in the distribution network are expressed analytically through matrices operations,and the weak links can then be intuitively *** cumbersome operation of checking each component is avoided,and the computational efficiency is improved.

关键词： Analytical expression distribution network N−1 contingency analysis weak link

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Experimental Research on the Impact of Water Vapor and Solid Particles on the Air Gap DC Discharge Characteristics 11th

Experimental Research on the Impact of Water Vapor and Solid...

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11th Frontier Academic Forum of Electrical Engineering, FAFEE 2024

作者： Cheng, Tingting Ji, Lanlan Su, Pengfei Li, Yuanzhen Li, Gaoyue Jiang, Xingliang Wang, Linghao State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Key Laboratory of Power Transmission Equipment Technology School of Electrical Engineering Chongqing University Chongqing China

ISBN: (纸本)9789819788316

Long-term exposure of outdoor power transmission and distribution equipment to varying levels of water vapor and solid particles in the atmospheric environment often leads to diminished insulation strength, consequently posing safety hazards. This paper delves into a systematic exploration of the impact of water vapor and solid particles in impure air on the DC breakdown characteristics of air gaps. Through the design and implementation of a tailored discharge chamber and air filtration system, the study scrutinizes the influence of these factors on the DC breakdown characteristics of a needle-plate gap. The findings reveal that, under conditions of humidity saturation, the frequency breakdown voltage of the needle-plate gap escalates with rising water vapor concentration. With the passage of solid particles, the breakdown voltage of the needle-plate gap exhibits an upward trend correlated with increasing solid particle concentration. Conversely, larger particle sizes tend to induce a reduction in breakdown voltage. Additionally, while the relative dielectric constant of solid particulate matter generally maintains the breakdown voltage at a stable level, there is a slight inclination towards decrease. © Beijing Paike Culture Commu. Co., Ltd. 2025.

关键词： Needles

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Photovoltaic Power Prediction Cosidering Mode Switching and Parallel Weight Adjustment

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Energy Engineering 2025年第4期122卷 1387-1402页

作者： Penghui Liu Tianyu Yang Peng Zhang Peiyuan Zou School of Electrical Engineering and Automation Henan Polytechnic UniversityJiaozuo454003China Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin300072China Dispatching Center Dongguan Power Supply Bureau of Guangdong Power Grid Co.Ltd.Dongguan523000China

The photovoltaic(PV)output process is inherently complex,often disrupted by a multitude of meteoro-logical factors,while conventional detection methods at PV power stations prove inadequate,compromising prediction *** address this challenge,this paper introduces a power prediction method that leverages modal switching(MS),weight factor adjustment(WFA),and parallel long short-term memory(PALSTM).Initially,historical PV power station data is categorized into distinct modes based on global horizontal irradiance and converted solar *** analysis is then employed to evaluate the impact of various meteorological factors on PV power,selecting those with strong correlations for each specific ***,the weights of meteorological parameters are optimized and adjusted,and a PALSTM neural network is constructed,with its parallel modal parameters refined through *** on the prediction time and input data mode characteristics,the appropriate mode channel is selected to forecast PV power station ***,the feasibility of this method is validated through an illustrative analysis of measured data from an Australian PV power *** test results underscore the method’s advantages,particularly in scenarios where existing detection methods are lacking and meteorological factors frequently fluctuate,demonstrating its superior prediction accuracy and stability.

关键词： Ultra short-term power prediction mode switching weight factor adjustment parallel neural network

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