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

作者： Zhanhe Li Kaibin Miao Weihan Bao Chao Lu Xiaoqian Li Lingyun Zhang Dept. of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China Sichuan Energy Internet Research Institute Tsinghua University Chengdu China China Academy of Railway Science Co. Ltd Beijing China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With rising demands for environmental protection and energy efficiency, integrating photovoltaic (PV) resources into flexible DC traction power systems (TPSs) has become increasingly important. However, PV integration faces two main challenges: the volatility of PV output and traction load uncertainties, as well as the effect of power flow optimization under coordinated control. Current methods, including dynamic simulation, power balance analysis, and power flow analysis, struggle to comprehensively evaluate these factors. To address this, this study proposes a PV Utilization Benefit (PVUB) evaluation model, which quantifies the operational benefits of PV integration by accounting for both PV and traction load uncertainties and power flow optimization effects. Applied to a real-world case on a Beijing Metro Line, the PVUB model effectively analyzes investment benefits and the impact of key factors, providing essential technical support for PV planning and power flow analysis of PV-integrated flexible DC TPSs.

关键词： Resistance Photovoltaic systems Uncertainty Evaluation models Traction power supplies Planning Indexes Optimization Load flow analysis Investment

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Design and Implementation of power Communication Network 3D Simulation Training system Based on Unity3D

Design and Implementation of Power Communication Network 3D ...

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2021 IEEE Conference on Telecommunications, Optics and Computer Science, TOCS 2021

作者： Hao, Xue Geng, Lizhuo Liu, Lu Gao, Feng He, Jianming Gao, Qi Training Center State Grid Hebei Electric Power Company Limited Shijiazhuang China Beijing Kedong Power Control System Company Limited Simulation RD Dept Beijing China

ISBN: (纸本)9781665424981

Aiming at the problem that the existing power communication network simulation tools are lack of three-dimensional operation function and can't fully meet the training needs, a new power communication network three-dimensional simulation training system is designed and developed. This paper introduces the software architecture and functions of each part of the system. Then key technologies of the system are introduced in details, such as construction method of 3D communication equipment component models based on Unity3D, dynamic generation method of 3D communication equipment room. Finally, the system implementation and results are introduced. The system builds a highly realistic training tool, which can replace expensive communication equipments and meet power communication professionals, training needs in many aspects, such as communication room roaming and inspection, equipment cognition, hardware operation, fault handling, etc. © 2021 IEEE.

关键词： Construction equipment

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Research on multifunctional fault simulation system of electric power optical transport network 6

Research on multifunctional fault simulation system of elect...

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6th International Conference on Communication, Image and Signal Processings, CCISP 2021

作者： Geng, Lizhuo Hao, Xue Liu, Lu Training Center State Grid Hebei Electric Power Company Limited Shijiazhuang China New Technology Dept. Beijing Kedong Electric Power Control System Company Limited Beijing China

ISBN: (纸本)9781665432795

With the rapid construction of electric power optical transport network, it is urgent to build the effective and flexible network fault simulation environment to improve the fault analysis and handling competence of communication operation and maintenance personnel. Aiming at the problems of fault training and drill environment built with real OTN equipments, this paper proposes an all-digital multifunctional optical transport network fault simulation solution. This paper introduces the architecture of the simulation system. Then key technologies of the system are explained, such as OTN equipment mechanism model, optical signal panoramic simulation and alarm automatic generation. Finally, the application of the system is briefly introduced. © 2021 IEEE

关键词： Optical communication

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Nonlinear E-field Simulation of HVDC Converter Transformer Busing and Its Structure Optimization With RBF Neural Network and NSGA-II Algorithm

Nonlinear E-field Simulation of HVDC Converter Transformer B...

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IEEE International Conference on power and Energy systems (ICPES)

作者： Yongsheng He Shiling Zhang Zongxiang Lu Pengbo Wang State Grid Chongqing Electric Power Company Chongqing Electric Power Research Institute Chongqing China State Key Lab of Control and Simulation of Power Systems and Generation Equipment Haidian China Dept name of State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China

Static DC and PR are typical operation conditions of HVDC converter transformer bushing outlet device, moreover, the electrical parameters of RIP, transformer oil and OIP have the nonlinear relationship with E-field stress and temperature. Under the temperature gradient, the electrical parameters will modify the static DC and PR E-field distribution of the composite insulation. In order to simulate static DC and PR electric field of the composite insulation structure, this paper established the full model of the converter transformer outlet. Then, the structure parameters of converter transformer outlet have been optimized using combined RBF neural network and NSGA-II algorithm. Moreover, electric field verification calculation has been carried out under AC and PR conditions. The results show that under uniform temperature condition, E-field strength is larger than that under iso-thermal condition. The overshoot coefficient of the bushing end and barrier reach 65% and 45%, respectively. The study can provide reference for the design of outlet structure of the converter transformer.

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Hybrid control for Integrating Grid-Forming and Grid-Following Capabilities in a Single VSI: An Efficiency-Driven Approach

Hybrid Control for Integrating Grid-Forming and Grid-Followi...

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IEEE International Symposium on power Electronics for Distributed Generation systems (PEDG)

作者： Iman Lorzadeh Omid Lorzadeh Dimitar V. Bozalakov Luc Dupré Lieven Vandevelde Dept. of Electromechanical. System and Metal Eng. EELAB Ghent University Ghent Belgium Dept. of Electrical Eng. Power Electronics and Control R&D Team San Francisco California USA

ISBN: (数字)9798350361001

ISBN: (纸本)9798350361018

This paper introduces a novel hybrid control (HC) scheme, seamlessly integrating grid-forming and grid-following capabilities within a single voltage source inverter (VSI). HC enables a single VSI to effectively replicate the functions of two virtual parallel VSIs operating independently as grid-forming and grid-following inverters while ensuring system stability and reliability. This enhances VSI effectiveness, allowing simultaneous execution of vital tasks including voltage and frequency regulation, grid support, and precise reference power tracking. An HC-equipped VSI can emulate virtual inertia, ensuring stable voltage and frequency under various operational conditions with rapid and desirable dynamic responses. Furthermore, for optimal coordination with auxiliary control layers, the secondary control layer, responsible for overseeing grid frequency and voltage amplitude restoration, seamlessly integrates with the HC-based primary control. This integration ensures the effective operation of an HC-enabled VSI within a hierarchical control structure. The effectiveness of the proposed control scheme is substantiated via comprehensive simulation studies conducted on an HC-enabled multi-inverter system operating in islanded mode.

关键词： Voltage source inverters Grid following power system dynamics power system stability Stability analysis Robustness Voltage control

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Carbon Emission Responsibility Accounting in Renewable Energy-Integrated Dc Traction power systems

SSRN

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SSRN 2023年

作者： Li, Zhanhe Li, Xiaoqian Lu, Chao Ma, Kechun Bao, Weihan State Key Laboratory of Power System Operation and Control Dept. of Electrical Engineering Tsinghua University Beijing100084 China Sichuan Energy Internet Research Institute Tsinghua University Sichuan Chengdu610299 China School of Electrical Engineering Xi'an Jiaotong University Shaanxi Xi’an710049 China

This study presents a practical method to determine the carbon emission responsibility (CER) in DC traction power systems (TPSs) that incorporate renewable energy sources. The increasing importance of carbon peaking and neutrality necessitates novel carbon financing policies, such as carbon taxes and cap-and-trade, for which accurate CER calculation is crucial. This study focuses on CER related to electrical energy consumption, a complex task due to the separation of energy usage and carbon dioxide emissions. To address this, the research adapts the carbon emission flow (CEF) method to suit renewable energy-integrated DC TPSs, considering the unique characteristics of rail vehicles as energy prosumers and challenges in real-time power flow tracking. The proposed rail vehicle CEF model and real-time power flow tracing approach offer practical CER accounting solutions for system planning and real-time operation. A case study based on real engineering data validates the effectiveness of these methods, demonstrating their fairness to rail transit systems and AC utilities. © 2023, The Authors. All rights reserved.

关键词： Renewable energy resources

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Research on real-time simulation of wide area out-of-step system in CSG 4

Research on real-time simulation of wide area out-of-step sy...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Mao, Lifan Chang, Dongxu Liu, Ruicai Zhu, Yihua Guo, Hengdao Wu, Mingkang Hainan Power Grid Co. Ltd Power Dispatching and Control Center Haikou China Electric Power Research Institute China Southern Power Grid State Key Laboratory of HVDC Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728196060

In order to study the action characteristics of wide area out-of-step system in CSG, the real-time simulation study based on RTDS is carried out. In this paper, a test system based on the actual devices and the settings are constructed, and the modeling methods of the important measurement such as the power angle of tie line, Ucos φ oscillation curve and the voltage at the installation point of device are studied. The operation characteristics of wide area out-of-step system are fully verified by several serious single or multiple fault cases. The analysis of the simulation results shows that the wide area out-of-step system can meet the design requirements of splitting speediness, simultaneity and selectivity, and can solve the problems of late splitting in the south channel of Guangdong and Guangxi section, as well as the problem that the system cannot recover stability after splitting Guangdong and Guangxi, Guizhou and Guangxi section simultaneously. © 2020 IEEE.

关键词： Electric fault currents

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Feasibility analysis of single-end equivalent modeling to LCC-HVDC transimission system 4

Feasibility analysis of single-end equivalent modeling to LC...

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4th IEEE Conference on Energy Internet and Energy system Integration, EI2 2020

作者： Wang, Bin Li, Zhizhong Guo, Qi Liu, Zhijiang Li, Shuyong Cui, Liu Tsinghua University Dept. of Electrical Engineering Beijing China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China National Energy Power Grid Technology RD Centre Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781728196060

The commutation failures seriously threaten the safe operation of hybrid AC/DC grid. Considering that commutation failure occurs only on the inverter side, it is very important to study the voltage controlled current source model of LCC HVDC single terminal measurement information with high equivalent accuracy, which is very important for the practicality of real-time electromagnetic transient simulation of LCC HVDC dynamic phasor model. In order to this problem, this paper further discusses the single terminal equivalent model of LCC HVDC system which does not depend on the measurement information of DC sending end AC system, and explores the estimation method of single terminal fast transient response of complex AC/DC coupling faults induced by AC side fault of LCC HVDC inverter station and participation of DC control separation. The error distribution of single terminal equivalent calculation is quantitatively analyzed to lay a foundation for the follow-up protection and control technology research. © 2020 IEEE.

关键词： Electric inverters

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Distribution system fault location method using reclosure-generating traveling waves

Distribution system fault location method using reclosure-ge...

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2020 IEEE power and Energy Society General Meeting, PESGM 2020

作者： Dong, Xinzhou Wang, Haozong Xin, Zeyu Shi, Shenxing Wang, Bin Tsinghua University State Key Lab. of Control and Simulation of Power System and Generation Equipment Dept. of Electrical Engineering Beijing China

ISBN: (纸本)9781728155081

Fault location in distribution systems includes 2 subtasks: fault distance estimation and fault section identification. This paper presents a fault location method based on reclosure-generating traveling waves and system topology. Firstly, the reclosure-generating traveling waves under normal and fault conditions are analyzed to find the traveling wave reflected by fault point, through which the fault distance could be estimated. Secondly, we propose a fault section identification method by comparing real measured traveling waves with simulated traveling waves with different potential fault points. Noticing that only time information of traveling waves rather than their magnitude is necessary, instead of using electromagnetic transient simulation, we also present a simplified simulation algorithm that only focuses on the arrival time of traveling waves based on priority queue. Experiments demonstrate that the proposed method can locate fault points in high accuracy with low computational burden. © 2020 IEEE.

关键词： Location

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Adaptability Study on Out-of-Step Separation Devices of Complex Multiinfeed AC/ DC power systems

Adaptability Study on Out-of-Step Separation Devices of Comp...

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International Conference on power system Technology (powerCON)

作者： Yong Chen Dongxu Chang Yihua Zhu Yukun Zhu Hengdao Guo Shengnan Li Electric Power Research Institute Ltd. of Yunnan Power Grid Co. KunMing China State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China

ISBN: (纸本)9781665407380

The power flow distribution of the GuangxiGuangdong AC transmission section (GX-GD section) has changed greatly as Kunliulong and Lugaozhao three-terminal HVDC projects have been put into operation, and it is necessary to study on the adaptability of out-of-step separation devices. Based on the real primary system, an equivalent system model is proposed in this paper which can accurately locate the oscillation center and calculate the minimum voltage at the measuring point. Dynamic real-time simulation is carried out for various types and different principles of out-of-step separation devices. Typical problems such as unreliable out-of-step locking criterion in the fault process and device refusing to move when the oscillation center is located at the device installation point are found and solved At the same time, based on the power grid panoramic simulation test technology and the actual configuration of out-of-step separation devices, the problems in the coordination of out-of-step devices near the GX-GD section are comprehensively studied, and the suggestions of putting the wide area out-of-step separation system into operation as soon as possible are put forward. The improvement and optimization measures proposed in this paper have been applied in the real system.

关键词： Adaptation models Voltage measurement power measurement power system dynamics Stability criteria power system stability power grids

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