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3rd International Conference on Energy Engineering and power systems, EEPS 2023

作者： Wan, Yanghui Yan, Jiahao Chu, Tianfeng Li, Yaping Yuan, Kun Zhang, Kaifeng Southeast University Key Laboratory of Measurement and Control of Complex System of Engineering Ministry of Education Nanjing China Power Automation Department Nanjing China State Grid Liaoning Electric Power Co. Ltd. Electric Power Research Institute Shenyang China

ISBN: (纸本)9798350313857

Currently, control strategies for distributed photovoltaic (PV) power generation are relatively single and rigid, and cannot flexibly adapt to the diverse demands of power grids in different scenarios. Firstly, this paper analyzes the adaptive relationship between different dispatching demands, the regulation ability of distributed PV, and the characteristics of the local voltage. Secondly, for different scenarios, the coordinated controller determines the reference values of active power and reactive power given to the inverter. Thus, distributed PV power control modes which can adapt to different scenarios have been established. Then, these control modes can be classified into single control modes and compound control modes according to the complexity of scenario demands. On this basis, a specific two-layer adaptive control strategy and process of distributed PV power generation in a low-voltage distribution network are further proposed, which takes into account both external demands of the distribution network and the regulation ability of distributed PV. Finally, a case study is given to verify the rationality and effectiveness of the two-layer adaptive scenarios control strategy. This strategy can effectively improve the comprehensive support ability of distributed PV power generation towards the power grid in multiple scenarios, and improve the stable operation level of the regional power grid. © 2023 IEEE.

关键词： Reactive power

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Grid-forming control of VSC-HVDC systems Connecting Asynchronous power Grids

Grid-forming Control of VSC-HVDC Systems Connecting Asynchro...

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power system and Green Energy Conference (PSGEC)

作者： Mingqun Liu Guanming Zeng Xin He Liang Tu Peng He Yihua Zhu Electric Power Research Institute Yunnan Power Grid Co. Ltd. Kunming State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid National Energy Power Grid Technology R&D Centre Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Interconnecting asynchronous power grids with the VSC-HVDC transmission is an important trend. To enhance the weak grid operation performance and grid frequency response capability of the VSC-HVDC system, a novel grid-forming without using the phase-locked-loop is applied in both ends of the VSC-HVDC system. The DC voltage-Active power droop-based grid-synchronization method is utilized. With the proposed method, the sending and the receiving end MMCs perform like a synchronous motor and a synchronous generator, respectively. When the frequency changes in either grid, the system can automatically response to it and change the active power transmission by VSC-HVDC to achieve primary frequency regulation and active frequency support. Finally, the validity of the dual-end grid-forming control is verified based on the simulations in PSCAD/EMTDC.

关键词： power transmission control systems Synchronous motors Market research power grids Synchronous generators Synchronization Phase locked loops Frequency control Grid forming

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A Software-Defined Reconfigurable Battery system Prototype 29

A Software-Defined Reconfigurable Battery System Prototype

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29th IEEE Asia Pacific Conference on Communications, APCC 2024

作者： Jin, Siyu Liu, Baochang Zhou, Yanglin Liang, Junrui Ci, Song Tsinghua University Department of Electrical Engineering Beijing China ShanghaiTech University School of Information Science and Technology Shanghai China Tsinghua University State Key Laboratory of Power System Operation and Control Beijing China

ISBN: (纸本)9798331517816

In the energy internet era, distributed energy storage systems will be widely used in various industrial, commercial, and residential scenarios. However, the modeling of energy flow and the digital flow of information operate on different temporal and spatial scales in traditional energy storage systems, lacking deep integration between energy flow and information flow. This prevents it from completely addressing the complex battery cell balancing and low safety issues in current distributed energy storage systems. The proposal of software-defined energy storage provides a new approach to solve the inherent problems in the battery industry by introducing the idea of internet shielding terminal differences into energy storage system. We proposed a software-defined reconfiguration battery system (SRBS) in this paper, which can manage different types of energy storage media to adapt to varying loads and operating conditions. Energy-type batteries, power-type batteries, and supercapacitors are integrated together to form an efficient and safe energy storage and power supply system. The hardware architecture and software control method of SRBS are described in detail. Finally, a real-world prototype is charged and discharged to show the successful coexistence and operation of different energy storage media within a single system. © 2024 IEEE.

关键词： Battery management systems

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A Novel power Distribution Strategy for Battery Storage Units in a Large-scale Station to Improve system Operating Performance 20

A Novel Power Distribution Strategy for Battery Storage Unit...

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20th International Conference on AC and DC power Transmission 2024, ACDC 2024

作者： Han, Chenhui Wang, Jinyu Luo, Longzhou Ci, Song Zhou, Yanglin School of Electrical Engineering Xi'an Jiaotong University Xi'an China Department of Electrical Engineering Tsinghua University Beijing China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (纸本)9781837242672

Large-scale battery energy storage systems have the advantages of rapid response speed and high regulation precision. Their widespread application contributes to the stable operation of power grids. Nowadays, the design of an optimal power distribution strategy for the storage units that maximizes the benefits of energy storage stations is a hot spot of research. This paper presents a comprehensive power distribution model, which is suitable for energy storage stations. The model incorporates multiple objective factors such as the output power, the depth of discharge (DOD), and the uniformity of the state of Charge (SOC). One of the advantages of the designed model is its capability to optimize the longevity of the energy storage systems by managing the SOC convergence effectively and minimizing life loss through judicious power allocation. This approach improves the reliability and efficiency of energy storage system operations. Additionally, the model integrates temperature regulation costs, further enhancing its applicability and relevance to practical scenarios. © The Institution of Engineering & Technology 2024.

关键词： Battery storage

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Vibration Characteristics of Slotless Rotating Armature Permanent Magnet Motors

Vibration Characteristics of Slotless Rotating Armature Perm...

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2022 International Conference on Electrical Machines, ICEM 2022

作者： Yang, Zhanlu Wang, Shanming Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing100084 China Navy Submarine Academy Qingdao266100 China

ISBN: (数字)9781665414326

ISBN: (纸本)9781665414326

For the rotating armature permanent magnet motor (RAPMM), the rotor slot move relating to the stator, which causes the variation of electromagnetic excitation force and the slot-frequency vibration. In order to reduce the slot-frequency vibration of RAPMM, a slotless rotating armature permanent magnet motor (SRAPMM) is proposed and prototyped. The magnetic field, torque, and torque ripple are simulated by finite element method, which shows that the air gap flux density and the radial force keep nearly constant. Vibration experiments were carried out on two SRAPMMs with different magnetic pole widths. The results show that when the motor is no-loaded, the frequency of the main vibration is even times of the current frequency. After the motor is loaded, the amplitude of the electromagnetic vibration is significantly smaller than that caused by mechanical reasons, indicating that the SRAPMM is a good alternative in the application of strict requirements for vibration. © 2022 IEEE.

关键词： Permanent magnets

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Modelling and harmonic analysis of metro traction power supply system 18

Modelling and harmonic analysis of metro traction power supp...

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18th International Conference on AC and DC power Transmission, ACDC 2022

作者： Guo, Peiqian Zhao, Yuming Liu, Guowei Yuan, Zhichang Wu, Aijun Wang, Yuxuan Jiang, Zhilin Xiang, Miaoyi State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Beijing China Shenzhen Power Supply Corporation Shenzhen China

ISBN: (数字)9781839537615

ISBN: (纸本)9781839537615

The large number of nonlinear loads used in urban metro rail traction grids distorts the voltage and current on the load side, then generates harmonics. The resulting capacitive characteristic harmonics current component provides feedback to the power grid, thus causing additional power losses and equipment damage. To solve this power quality problem, a detailed dynamic simulator of the metro traction power supply system is developed, which includes the corresponding 24-pulse rectifier and low-voltage power distribution system. Based on the established simulator, a study of the harmonic content and characteristics research of the 24-pulse rectifier and low-voltage electricity-consuming equipment are performed. In combination with the digital simulator, we presented and disused the lower-order frequency harmonic currents of the 35kV AC bus exhibiting capacitive characteristics. The results lay a technical foundation for harmonic equivalent impedance calculation and harmonic current suppression of the metro traction power supply system. © ACDC 2022. All rights reserved.

关键词： Simulators

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A Bi-Level Real-Time Dispatch Strategy for Large-Scale Electric Vehicles into Smart Grid Based on an Improved Rolling Horizon Method

SSRN

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SSRN 2024年

作者： Wang, He Wang, Yao Bian, Jing Li, Guoqing Key Laboratory of Modern Power System Simulation and Control and New Green Electricity Technology Ministry of Education Northeast Electric Power University Jilin132012 China

The flexible energy storage characteristics of Electric vehicles (EVs) make them an important target for grid demand response. However, in the context of large-scale EVs into the grid, an important challenge currently is how to improve the accuracy of the V2G activity while taking into account the interests of both EVs and the grid. To address this problem, this paper proposes a bi-level real-time dispatch strategy based on an improved rolling horizon method (RHM). In the upper-level strategy, the relation between electricity price and power grid energy regulation demand is established by introducing a fixed base elasticity coefficient. An algorithm process is designed to find the relationship between the real-time price and the EVs load to be scheduled, to solve a real-time price that can maximize the income of the grid. In the lower-level strategy, the C&D schedule is developed for each EV to minimize the user cost, and the temporal scheduling constraint is ensured by grouping as well as parallel computing. simulation results show that the proposed real-time strategy effectively improves the accuracy of the V2G activity and increases profits for the grid and EVs. © 2024, The Authors. All rights reserved.

关键词： Vehicle-to-grid

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Optimal power system Scheduling Considering Uncertainty-Induced Generation Unit Output Curtailment 25

Optimal Power System Scheduling Considering Uncertainty-Indu...

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25th IEEE China Conference on system simulation Technology and its Application, CCSSTA 2024

作者： Hu, Wei Mi, Ning Zhong, Hailiang Chen, Weihan Ma, Kun Geng, Tianxiang Wang, Yun Su, Bo Yang, Long Tsinghua University State Key Laboratory of Power System and Generation Equipment Department of Electrical Engineering Beijing China Dispatching Control Center State Grid Ningxia Electric Power Co. Ltd. Yinchuan China Tsinghua University Department of Electrical Engineering and Applied Electronic Technology Beijing China

ISBN: (纸本)9798350366600

Under the call of the national 'dual carbon' goals, the growth of the proportion of new energy generation has become an inevitable trend in energy structure adjustment. The 'static parameter' model, which traditional thermal power units rely on, can no longer accurately reflect their output uncertainty, urgently requiring a new optimization scheduling strategy to cope with this change. This study proposes an optimized scheduling model for power generation systems that considers the output curtailment and unplanned outages of thermal power units. It employs non-parametric kernel density estimation techniques to model the uncertainty of thermal power unit output and uses chance constraints to define the fluctuation range of generation output and the system's reliability. The model adopts a scenario generation method based on Copula theory to construct output scenarios and further employs reduction techniques to optimize the number of scenarios. Moreover, this paper introduces Conditional Value at Risk as a key indicator to measure the cost of system uncertainty risk, thereby providing a more comprehensive perspective in risk assessment. simulation experiments on the IEEE 30-node standard system demonstrate that compared to traditional optimization scheduling models relying on static parameters, the proposed model can more effectively balance the output fluctuations of different thermal power units, significantly reducing the risk of curtailment due to supply shortages. This study offers a new theoretical basis and practical guidance for optimizing the scheduling of power systems under the context of large-scale integration of new energy and economic fluctuations. © 2024 IEEE.

关键词： Chance Constraints Conditional Value at Risk Output Curtailment Scenario Generation

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Topological Identification of Distribution Network Based on μPMU Voltage Phase Data 10

Topological Identification of Distribution Network Based on ...

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10th China International Conference on Electricity Distribution, CICED 2022

作者： Guo, Shaofei Wang, Xianzhi Tianying, Chen Ze, Li Shiyan, Liu Hebei Key Laboratory of Energy Internet Simulation Modeling and Control State Grid Hebei Electric Power Research Institute Shijiazhuang China

ISBN: (数字)9781665452687

ISBN: (纸本)9781665452687

The structure of distribution network becomes more and more complex. In order to ensure the safety and stable operation of the system, it is necessary to obtain the current network structure in real time. In order to meet the requirement that the distribution network topology recognition must be fast and accurate, a distribution network topology recognition method based on micro-synchronous Phasor Measurement Unit (μPMU) is proposed. Firstly, the topology identification criterion is constructed by using the voltage and phase data before and after the topology change. Then, a topology recognition algorithm based on phase difference is proposed to analyze the difference between the voltage phase and the actual phase under different topology conditions, and the topology corresponding to the minimum difference is selected as the actual topology to realize the correct recognition of the distribution network. Finally, a simulation example is given to verify the correctness of the proposed method, and the influencing factors of topology recognition are analyzed. The results show that the criterion is correct and reliable, and the proposed topology recognition algorithm has high recognition accuracy. © 2022 IEEE.

关键词： Topology

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Prototype Guided Personalized Federated Intrusion Detection system 10

Prototype Guided Personalized Federated Intrusion Detection ...

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10th IEEE Smart World Congress, SWC 2024

作者： Cheng, Long Yan, Huiru Zhou, Hanlin Wang, Ying Tang, Haichuan Fang, Fang North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering Beijing China Institute of Computing Technology Chinese Academy of Sciences Beijing China Ai Lab of Crrc Academy Beijing China

ISBN: (纸本)9798331520861

Preventing network attacks and protecting user privacy are consistently hot research topics in the Internet of Things (IoT) and edge computing fields. Recent advancements in Federated Learning (FL) have shown promise in addressing these challenges. FL allows various clients to collaboratively build an intrusion detection system (IDS) without sharing their private data. However, most existing methods train a single intrusion detection model for all clients and assume that the training and test data distribution are identical, leading to unsatisfactory detection accuracy and generalization abilities in practice. To overcome these challenges, this paper introduces a prototype-guided personalized FL approach named PG-FedIDS. We propose two novel mechanisms within this method. Firstly, we utilize class prototypes as auxiliary information carriers to generate personalized models for each client, rather than generating a single global model as in previous works. Secondly, we propose a prototype-guided ensemble learning strategy, which can leverage the global knowledge in prototypes to enhance detection accuracy and generalization abilities for each client. We conduct extensive experiments on two benchmark datasets with different evaluation test settings. The results demonstrate that our PG-FedIDS achieves promising detection accuracy and consistently outperforms other FL baselines. © 2024 IEEE.

关键词： Federated learning

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