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

作者： Aizuo Chen Yue Quan Yanglin Zhou Ertao Lei Junkun Zhang Song Ci Department of Electrical Engineering Tsinghua University Beijing 100084 People's Republic of China Electric Power Research Institute of Guangdong Power Grid Co. Ltd Guangdong 510080 People's Republic of China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing 100084 People's Republic of China

ISBN: (数字)9781837241552

In the field of battery circuit model parameter estimation, the combination of bilinear transformation with the least squares method has garnered widespread attention due to its excellent performance under continuous current conditions. However, in dynamic reconfigurable battery network (DRBN), the network's topological structure is constantly changing, and the battery current consists of non-periodic pulse signal sequences, making it challenging for traditional methods to accurately estimate the battery model parameters within such networks. To address this issue, this paper proposes a lithium-ion battery circuit model parameter estimation method that takes into account network topology reconfiguration. This method, based on the operational modes and sampling methods of DRBN, derives a new discrete transformation formula for the transfer function and constructs a least squares model parameter identification model using this formula. By establishing an experimental platform for DRBN, the effectiveness of the proposed method is validated in this paper.

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Research on Automatic Construction and Correlation Method of Virtual and Real Loops in UHV DC control and Protection system

Research on Automatic Construction and Correlation Method of...

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2021 IEEE Sustainable power and Energy Conference, iSPEC 2021

作者： Lu, Yuanhong Guo, Qi Liu, Zhijiang Li, Shuyong Guo, Haiping Zeng, Guanming China Southern Power Grid State Key Laboratory of Hvdc Electric Power Research Institute Guangzhou China National Energy Power Grid Technology R&d Centre Guangzhou China Guangdong Prov. Key Laboratory O F Intelligent Operation and Control for New Energy Power System Guangzhou China Csg Key Laboratory for Power System Simulation Electric Power Research Institute Guangzhou China

ISBN: (纸本)9781665414395

At present, in the research on virtual and real loops of control and protection systems, scholars at home and abroad are mainly focusing on the field of AC digital substations, and there is less research on the virtual and real loops of UHV DC control and protection systems. Aiming at this problem, this paper proposes an automatic construction and correlation method for virtual and real loops of UHV DC control and protection system. This method automatically constructs the real circuit by analyzing the design drawings and the optical cable inventory, analyzing the DC visualization program to automatically construct the virtual circuit, and then automatically correlates the virtual and real circuits based on the graph depth traversal algorithm. The practical application in UHV DC engineering shows that this method can help relevant personnel complete the automatic construction and correlation of virtual and real loops, and improve the convenience of operation and maintenance of the UHV DC control and protection system. © 2021 IEEE.

关键词： Correlation methods

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Erratum to:A mechanical reinforced and antifreezing polyacrylate hydrogel electrolyte for high-performance zinc-ion batteries

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Nano Research 2025年第4期18卷 658-658页

作者： Zili Zhang Ruolin Wang Hongfei Lu Di Zhang Yu Zhao Jing Xu Bin Sun Zhi-Min Dang Yang Jin School of Electrical and Information Engineering Zheng Zhou UniversityZhengzhou 450001China State Key Laboratory of Power System Operation and Control Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Erratum to:Nano Research,2025,18(1):***://***/10.26599/*** was an error in the second affiliation of the author“Zhi-Min Dang”in the published *** the online version of this paper is corrected.

关键词： electrolyte antifreezing zinc ion batteries mechanical reinforcement polyacrylate hydrogel

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A Stochastic Resource Management Scheme for Multi-Energy Group control system

A Stochastic Resource Management Scheme for Multi-Energy Gro...

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power Electronics, Computer Applications (ICPECA), IEEE International Conference on

作者： Ran Ding Rongfu Sun Yan Geng Yiming Yao Ergang Zhao Lina Xu State Grid Jibei Electric Power Company Limited Beijing China Dept. of Electrical Engineering State Key Lab. of Control and Simulation of Power System and Generation Equipment Tsinghua University Beijing China

The interaction between various energy supply systems (cold, heat, electricity, gas, etc.) is becoming more tightly coupled as social economy and technology advance. Multi-energy systems are ineffective because different types of energy systems run independently. In order to protect the data privacy of each sub-system, this research suggests an ideal resource management framework for a multi-energy group control system. The energy hub (EH) paradigm is first suggested. When deploying EHs, the physical constraints of various energy systems are taken into account. Through scenario-based stochastic programming, the uncertainties of renewable energy are considered. According to the leader-follower relationship between multi-energy group control system operators and energy hub operators (EHOs), Benders decomposition is applied to decentralize the decision-making process. Finally, an example is given to illustrate the effectiveness of the proposed model and algorithm.

关键词： Data privacy Renewable energy sources Uncertainty Decision making Stochastic processes Process control Programming

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Hybrid Impedance Reshaping Method of Grid-Connected Inverters in Weak Grid

Hybrid Impedance Reshaping Method of Grid-Connected Inverter...

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power Electronics and power system Conference (PEPSC)

作者： Weike Zheng Haijiao Wang Bao Xie Meiqin Mao State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China Photovoltaic System Engineering Research Center of the Ministry of Education Hefei University of Technology Hefei China

Both the phase-locked loop (PLL) and the common coupling point (PCC) voltage feedforward may have impacts on the inverter system stability in weak grid. Therefore, a hybrid impedance reshaping control strategy is proposed in the paper. Firstly, the inverter impedance model is established. Next, the system stability is analyzed under weak grid, reflecting on the influence of PLL and the PCC voltage feedforward. Then, to improve the inverter system stability, the band-pass filter is added to the feedforward branch of PCC voltage, since it can attenuate the influence of unstable factors. Moreover, a new phase-locked loop structure containing a first-order decoupled complex filter is proposed, taking into account the fundamental positive voltage extraction characteristics of the first-order decoupled complex filter. The parameters of the hybrid impedance reshaping strategy are designed in detail. Finally, simulation is carried out to prove the theory analysis and hybrid impedance reshaping strategy in the paper.

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Numerical Study of High-Energy Spark Ignition Characteristics in a Scramjet Combustor

SSRN

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SSRN 2024年

作者： Gao, Ziyan Zhang, Meng Zhang, Zhibo Wu, Yun Zheng, Xing Miao, Huifeng National Key Lab of Aerospace Power System and Plasma Technology Xi’an Jiaotong University Xi’an710049 China State Key Laboratory of Multiphase Flow in Power Engineering Xi'an Jiaotong Universiy Xi’an710049 China National Key Lab of Aerospace Power System and Plasma Technology Air Force Engineering University Xi’an710038 China Shaanxi Key Laboratory of Environment and Control for Flight Vehicle School of Aerospace Engineering Xi’an Jiaotong University Shaanxi 710049 China

Reliable ignition is a fundamental prerequisite for the scramjet engines. In order to improve the reliability of ignition, further enhance the application of spark ignition in engineering, and improve the ignition ability in the field of supersonic combustion, an innovative long electrode distance high-energy spark igniter (LHSI) system was proposed by our research team. To reveal the instantaneous ignition characteristics of the LHSI, a simulation model of the LHSI is established and verified by experiments. Based on this, the formation and development of the initial fire core of vaporized kerosene and the ignition characteristics of LHSI in a scramjet combustor were simulated and compared with the conventional high-energy spark igniter (HSI). The analysis revealed that the success of the cavity ignition is greatly influenced by the local equivalent ratio of the initial flow field and the penetration depth of the initial flame core. Meanwhile, the fore recirculation zone of the cavity plays a key role in stabilization and development of the initial fire core. Compared with the HSI, the LHSI can produce initial flame core with higher penetration and greater size, which is the main reason for why LHSI has a broader ignition boundary. © 2024, The Authors. All rights reserved.

关键词： Ignition

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Commutation Fault Identification of UHVDC Transmission system Based on Dissipated Energy

Commutation Fault Identification of UHVDC Transmission Syste...

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IEEE/IAS Industrial and Commercial power system Asia (I&CPS Asia)

作者： Weiming Zhang Shuai Yuan Gong Cheng Qingsheng Zhao Dingkang Liang Minhong Yuan Shanxi Key Laboratory of Power System Operation and Control College of Taiyuan University of Technology Taiyuan China State Grid UHV Transmission CO.OF SEPC State Grid Power Supply Company Taiyuan China State Grid UHV Transformation CO.OF SEPC State Grid Power Supply Company Taiyuan China State Grid Power Supply Company Taiyuan China

Commutation failure is a common fault in UHVDC transmission systems that use grid commutation converters. If commutation failure occurs, it will cause DC power fluctuations and perhaps a DC lockout, endangering the grid's ability to function safely and steadily. Therefore, it is critical to correctly and promptly diagnose the failure and implement the necessary controls to prevent commutation failure from happening in the later stage. This paper first uses MATlab/SIMULINK to build the simulation model of UHVDC transmission system, and then the different types of faults on the inverter side commutation bus are simulated. To determine the faulty type of commutation failure, this paper proposes a commutation failure identification method of UHVDC transmission system based on dissipated energy, the outcomes demonstrate that this method is cable of correctly determine the commutation failure type brought on by a commutation bus fault.

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LVRT During-fault-stage Equilibrium Point is Unnecessary for Renewable Grid-tied systems

LVRT During-fault-stage Equilibrium Point is Unnecessary for...

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power system and Green Energy Conference (PSGEC)

作者： Yayao Zhang Min Cheng Meng Zhan Jiawei Yu Yihua Zhu Mingkang Wu State Key Laboratory of Advanced Electromagnetic Engineering and Technology School of Electrical and Electronic Engineering Huazhong University of Science and Technology Wuhan China Yunnan Power Grid China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid China National Energy Power Grid Technology R&D Centre Electric Power Research Institute China Southern Power Grid China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Electric Power Research Institute China Southern Power Grid China

ISBN: (数字)9798350365573

ISBN: (纸本)9798350365580

Transient synchronous stability of renewable grid- tied systems is of paramount importance. Most of previous studies focused on the grid-tied converter in the low voltage ride through (LVRT) during-fault stage and performed stability analysis based on the belief that if the system has (or has no) a stable equilibrium point in the during-fault stage, the system will be stable (or unstable). Therefore, it has been broadly accepted that the existence and/or stability of equilibrium point in the during-fault stage is necessary. However, the whole LVRT contains four different stages and the during-fault stage is only one among them. The transient synchronous stability of whole system should be determined by the initial state in the late post-fault stage and the attraction basin of its equilibrium point. The late post-fault stage is essential for stability and all four stages are important. Clearly treating the during-fault stage as the whole LVRT stages makes the nonlinear switched dynamics problem be greatly simplified and, certainly, is incomplete. In order to clarify this point, this paper analyzes the influence of existence (or nonexistence) of equilibrium point in the during-fault stage on the transient synchronous stability of permanent magnet synchronous generator grid-tied system. We can find that the existence of an equilibrium point in the during-fault stage is only a sufficient condition, rather than a necessary condition. The theoretical analysis is also verified in the hardware-in-the-loop experiment Therefore, a large number of previous studies and results on the transient synchronous stability of renewable grid-tied systems are incomplete and questionable.

关键词： Sufficient conditions Stability criteria Switches Voltage power system stability Synchronous generators Permanent magnets Nonlinear dynamical systems Transient analysis Magnetic switching

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High-performance Full Electromagnetic Transient Simulation system of Fujian power Grid and its Application 5

High-performance Full Electromagnetic Transient Simulation S...

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5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Li, Zhicheng Tang, Zhijun Zhang, Dongyuan Chao, Wujie Peng, Xiaoyan Leng, Yongjie Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian Key Laboratory of Smart Grid Protection and Operation Control Fujian China Electric Power Research Institute State Grid Fujian Electric Power Co. Ltd Fujian Key Laboratory of Smart Grid Protection and Operation Control Fuzhou China Integrated Electronic Systems Lab Co. Ltd. Jinan China

ISBN: (纸本)9781665434256

This paper proposes a high-performance full electromagnetic transient simulation system of Fujian power grid. The system is developed based on the General Transient Simulator (GTS), which is a self-developed electromagnetic transient simulation tool. The key technologies of the simulation system, such as the high-performance automatic parallel computing technology and the large time step electromagnetic transient simulation technology, are introduced. The full electromagnetic transient simulation of the AC power system above lOkV in Fujian power grid based on the dispatching control cloud platform is realized. Study cases are carried out and the validity and accuracy of the simulation are verified by comparing the actual fault recording data and simulation waveforms. © 2021 IEEE

关键词： Transients

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Evaluating The Aggregated Frequency Regulation Capability of Energy Storage Clusters

Evaluating The Aggregated Frequency Regulation Capability of...

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IEEE Conference on Energy Internet and Energy system Integration (EI2)

作者： Jiaxiong Xiang Bo Yang Shibo Wang Zhi Zhang Zheyi Pei Kecheng Li Guangqi Zhou Ming Zhou State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing China State Key Laboratory of Operation and Control of Renewable Energy & Storage Systems China Electric Power Research Institute Beijing China State Grid Shandong Electric Power Research Institute Jinan China State Grid Corporation of China Beijing China China Electric Power Research Institute Beijing China

With the integration of a large number of wind and solar new energy power generation into the power grid, the system faces frequency security issues. Energy storage stations (ESS) can effectively maintain frequency stability due to their ability to quickly adjust power. Due to the differences in the state of each ESS and the topology of the power grid, it is difficult to evaluate the frequency support capability of the energy storage cluster (ESC) in real-time. This paper proposes a real-time evaluation model for the aggregated frequency support capability of ESC. The evaluation indicators for inertia support and primary frequency regulation (PFR) capability is proposed respectively. Considering the aggregation effect of ESC, the evaluation of frequency support ability for ESC is transformed into an optimization problem. This article establishes evaluation models for the inertia support capability and primary frequency regulation capability of ESC, respectively. In the evaluation model, we establish frequency response models for ESS based on virtual inertia and droop control, considering the differences in the states of each ESS and network security constraints. The case study shows that the model can evaluate the frequency support capability of energy storage clusters based on their real-time status. When considering network constraints, the supporting capacity of ESC exhibits spatial distribution characteristics.

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