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25th IEEE China Conference on System simulation technology and its Application, CCSSTA 2024

作者： Liu, Yanru Guo, Yue Lu, Mingxuan Zhang, Longyu Ren, Yuan Kong, Xiangyu State Grid Economic and Technological Research Institute Co. Ltd Beijing China Economic Technology Research Institute State Grid Liaoning Electric Power Supply Co. Ltd Shenyang China Tianjin University Key Laboratory of Smart Grid of Ministry of Education Tianjin China

ISBN: (纸本)9798350366600

The Virtual Power Plant (VPP) can break geographical limitations and achieve wide-area energy interconnection and sharing. To address the differences in 'generation-load' resources among different VPPC within the same region and to solve the real-time power balance issues caused by the volatility of distributed renewable energy (DRE) and the uncertainty of electricity consumption behavior, a cluster service provider is introduced to manage the clusters containing various types of VPPC. Independent pricing for internal energy exchanges within the VPP cluster is implemented to incentivize VPPC to participate in coordinated dispatch. Considering the predictability of random variables and the cumulative errors that increase with decision-making time, a two-stage joint optimization model is established, which includes day-ahead coordinated dispatch and intra-day rolling optimization. The day-ahead stage focuses on the participation of multiple VPP clusters in external market transactions and internal energy exchanges, while the intra-day stage focuses on balancing VPP power to reduce deviations, forming a multitime-scale scheduling strategy for energy sharing and interaction among multiple VPPC. Finally, a simulation analysis is conducted using a multi-VPP cluster system integrating various distributed energy sources as an example. The results demonstrate that the power balance issues within the VPP cluster system are effectively improved, significantly enhancing the overall operational economy. © 2024 IEEE.

关键词： coordinated dispatch distributed renewable energy energy interaction sharing rolling optimization virtual power plant

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Power grid local communication service isolation technology based on WLAN network slice

Power grid local communication service isolation technology ...

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2023 IEEE International Symposium on Broadband Multimedia Systems and Broadcasting, BMSB 2023

作者： An, Chunyan Zhai, Di Zhong, Cheng Zhang, Linlin Shao, Sujie State Grid Smart Grid Research Institute Co. Ltd Beijing China State Grid Xiong'an New Area Electric Power Supply Company Hebei China Beijing University of Posts and Telecommunications State Key Laboratory of Networking and Switching Technology Beijing China

ISBN: (纸本)9798350321524

With the development of urban electric Internet of things, there are a large number of access services in the local access side communication network of electric Internet of things. Designing a security isolation scheme for communication services on the power access side can provide a certain guarantee for the communication security of the power grid. This paper proposes a secure isolation technology for access side communication services based on WLAN (Wireless Local Area Network) network slicing. A network slicing controller is designed to allocate time-frequency resources to power grid communication services to construct network slices, so as to realize the logical isolation between communication services. An Actor-Critic algorithm based 802.11ax network slice resource scheduling method is designed to make full use of the slice resources. simulation results show that the network slice construction method can ensure the access side communication service logic isolation and make full use of communication resources. © 2023 IEEE.

关键词： Internet of things

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Research on Transient Characteristics of an Improved Phase-locked Loop Topology Suitable for VSC Converters

Research on Transient Characteristics of an Improved Phase-l...

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IEEE International Conference on Power and Power and Renewable Energy (ICPRE)

作者： Huaiguang Gu Jiapei Zhou Jinlong Qiu Jin Li State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation Beijing China State Grid Smart Grid Research Institute Co. Ltd Beijing China

ISBN: (数字)9798350377460

ISBN: (纸本)9798350377477

To solve the problem of deteriorating performance and poor stability of traditional PLL connected to weak AC system, an improved PLL structure is proposed in this paper. By measuring the angular velocity and initial phase Angle of the system respectively, the angular velocity of the system is first stabilized to ensure the synchronization between VSC and AC power grid, and then the initial phase Angle of the system is tracked by PI link to achieve accurate estimation and fast tracking of AC power grid phase Angle value. Finally, taking a classic VSC grid-connected system as an example, the effectiveness and stability of the improved PLL are verified by simulation.

关键词： Renewable energy sources Power measurement Power system stability Stability analysis Angular velocity Topology Velocity measurement Synchronization Phase locked loops Transient analysis

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Design of high voltage dc transformers for large scale new energy transmission

Design of high voltage DC transformers for large scale new e...

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Renewable Power Generation and Future Power Systems Conference 2023, RPG 2023 UK

作者： Han, Naizheng Deng, Weihua Lin, Zhiguang Liu, Yali Chen, Kailong Jiang, Zhe Lv, Zhenhua State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China State Grid Jiangsu Electric Power Research Institute Co. Ltd Nanjing China

ISBN: (纸本)9781839539848

The use of dc/dc converters to achieve full dc transmission of large-scale new energy can improve the operational efficiency and safety stability of the system. This paper proposes a new type of dc/dc converter to address the low engineering feasibility of current high-voltage and high-capacity dc/dc converters. Firstly, the topology construction theory based on auxiliary branch construction and the basic working principle of the new converter are introduced. Secondly, a two-phase bridge arm energy balance control strategy was proposed that can achieve stable power transmission and voltage transformation. And the parameter design method of the proposed transformer was introduced. Finally, the stable operation of the proposed transformer was simulated and verified on the PSCAD simulation platform, verifying the effectiveness of the proposed topology, control strategy, and parameter design method, providing theoretical support for the engineering application of high-voltage high-capacity dc/dc converters. © The Institution of Engineering & technology 2023.

关键词： Energy balance

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The Averaged-value Model of a Flexible Power Electronics Based Substation in Hybrid AC/dc Distribution Systems

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CSEE Journal of Power and Energy Systems 2022年第2期8卷 452-464页

作者： Hong Liu Zhanfeng Deng Xialin Li Li Guo Di Huang Shouqiang Fu Xiangyu Chen Chengshan Wang the Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China the State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research InstituteBeijing 100220China the State Grid Jibei Electric Power Economic Research Institute Beijing 100038China State Key Laboratory of Reliability and Intelligence of Electrical Equipment Hebei University of TechnologyTianjinChina the Guangzhou Power Supply Bureau of Guangdong Grid Co. Ltd.Guangzhou 510620China

The concept of a flexible power electronics substation(FPES)was first applied in the Zhangbei dc distribution network demonstration *** a multi-port power electronics transformer(PET)with different AC and dc voltage levels,the FPES has adopted a novel topology integrating modular multilevel converter(MMC)and four-winding medium frequency transformer(FWMFT)based multiport dc-dc converter,which can significantly reduce capacitance in each sub-module(SM)of a MMC and also save space and *** this paper,in order to accelerate speed of electromagnetic transient(EMT)simulations of FPES based hybrid AC/dc distribution systems,an averaged-value model(AVM)is proposed for efficient and accurate representation of *** that all SM capacitor voltages are perfectly balanced in the MMC,then the MMC behavior can be modeled using controlled voltage sources based on modulation voltages from control *** terms of the averaged current transfer characteristics among the windings of the FWMFT,we consider that all multiport dc-dc converters are controlled with the same dynamics,a lumped averaged model using controlled current and voltage sources has been developed for these four-port dc-dc converters connected to the upper or lower arms of the *** presented FPES AVM model has been tested and validated by comparison with a detailed IGBT-based EMT *** show that the AVM is significantly more efficient while maintaining its accuracy in an EMT simulation.

关键词： Averaged-value model(AVM) flexible power electronics substation(FPES) four-winding medium frequency transformer(FWMFT) hybrid AC/dc distribution systems modular multilevel converter(MMC) multiport dc-dc converter

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Physical Mechanism and Data Hybrid Modeling for Device-Level Emulation of Modular Multilevel Converter 8

Physical Mechanism and Data Hybrid Modeling for Device-Level...

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8th Asia Conference on Power and Electrical Engineering, ACPEE 2023

作者： Xie, Minhua Peng, Yixuan Zhang, Jiayuan Tang, Haijun Zhu, Ruimin Fan, Wei State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China Beijing Key Lab. of DC Grid Technol. and Simulat. State Grid Smart Grid Research Institute Co. Ltd. Beijing China North China Electric Power University School of Electrical and Electronics Engineering Baoding China State Grid Liaoning Electric Power Co. Ltd. Electric Power Research Institute of State Grid Liaoning Electric Power Co Ltd. Shenyang China

ISBN: (纸本)9798350345520

In the modular multilevel converter (MMC), the insulated gate bipolar transistor (IGBT) is one of the most important devices for power conversion. Therefore, an accurate and efficient model of the sub-module is significant for design, monitoring and diagnosis of valve towers. Due to the complex multi-physics field inside the semiconductor device, it is laborious to describe the physical mechanism model in detail. Traditional mechanism models cannot meet the requirements of digital twin applications. In this paper, a new modeling method for sub-modules based on long short-term memory neural network is developed and the model is integrated into the traditional model of MMC for simulation, which is a physical mechanism and data hybrid modeling method to retain both of their advantages. © 2023 IEEE.

关键词： Power converters

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Analysis and suppression of voltage oscillation at dc circuit breaker terminal in dc fault transient process

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High Voltage 2022年第6期7卷 1194-1203页

作者： Hong Shen Xianrui Huang Lei Qi Xiangyu Zhang Xiaojun Ni Peng Qiu Xiaoguang Wei Xiang Cui State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power UniversityBeijingChina Electric Power Research Institute State Grid Zhejiang Electric Power CompanyHangzhouChina State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co.Ltd.BeijingChina

High-frequency voltage oscillation occurs at the initial stage of dc short-circuit fault in the modular multilevel converter(MMC)-based high-voltage direct-current systems,which directly threatens the reliable operation of the secondary equipment in dc circuit breakers(dcCBs).Therefore,this paper focusses on the voltage oscillation characteristic at dcCB terminals,considered the stray parameters of connecting lines,the parasitic parameters of main equipment and the impedance of grounding grid,established equivalent circuit models of MMC-HVdc converter station at the initial stage of pole-topole and pole-to-ground fault,and obtained the analytical formula for the voltage oscillation ***,the comparison with the dc short-circuit test data of�200 kV MMC-HVdc converter station verified the validity of the models and revealed the mechanism of voltage ***,the influence of the parameters of the converter station on the oscillation characteristics was *** was proposed to install the dcCB at the MMC valve's terminal near the dc side,and the oscillation frequency is about 10–60 kHz,which is more than 5 times lower than that at the dc reactor's terminal near the dc pole bus,and the disturbance of oscillation to dcCB was alleviated.

关键词： oscillation. oscillation transient

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Topology Study of Advanced Co-Phase Traction Power Supply System Based on Multilevel Three-Phase to Single-Phase Converter 6

Topology Study of Advanced Co-Phase Traction Power Supply Sy...

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6th Asia Conference on Energy and Electrical Engineering, ACEEE 2023

作者： Chen, Bin Du, Xiong Yang, Hongjun Cao, Yuelong Du, Chengmao Wang, Heng Chongqing University State Key Laboratory of Power Transmission Equipment and System Security and New Technology Chongqing China State Grid Corporation of China Smart Grid Research Institute Beijing China

ISBN: (纸本)9798350312690

The single phase power frequency traction power supply system is widely used in electrified railways of China, which inevitably brings negative sequence problem, and slope stop accidents may occur when trains pass through the phase separation area due to the existence of electric phase separation. The Advanced co-phase traction power supply system based on multilevel three-phase to single-phase converter can effectively solve the above problems through three-phase-single-phase symmetrical transformation. Firstly, the existing multilevel three-phase to single phase converters for advanced co-phase traction power supply system are analyzed in terms of topology and operating characteristics, and concludes that the three-phase to single-phase converter based on the modular multilevel converter (MMC) structure has significant advantages, which is verified by simulation in PSCAD. Finally, under the background of high proportion of new energy sources connected to the power grid, a new energy hybrid multi-Terminal advanced co-phase traction power supply system based on MMC is proposed. The research in this paper can provide reference for the development of advanced traction power supply system. © 2023 IEEE.

关键词： Phase separation

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Harmonic Coordination Suppression Strategy of Hybrid grid-Connected System in Complex grid Scenarios 18th

Harmonic Coordination Suppression Strategy of Hybrid Grid-Co...

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18th Annual Conference of China Electrotechnical Society, ACCES 2023

作者： Huang, Tailin Rong, Fei Mu, Xiaobin Chen, Guofu Wang, Xiang Yuan, Yalei College of Electric and Information Engineering Hunan University Hunan Province Changsha410082 China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing102209 China

ISBN: (纸本)9789819710713

With the construction and development of new power system, current-type grid-following inverters and voltage-type grid-forming inverters are widely accessed to distribution substations, but this hybrid grid-connected system will have power quality problems in complex grid scenarios where there are distortions in the grid voltage as well as access to nonlinear loads, which will seriously affect the quality of regional power supply. This paper firstly establishes a harmonic equivalent model of the hybrid control grid-connected system, analyzes the strong coupling relationship between grid voltage harmonics and grid current harmonics, and proposes a harmonic coordination suppression strategy, which realizes the effective coordination of grid harmonic voltage and current harmonics by controlling the output harmonic voltage of grid-forming inverter and reshaping the harmonic output impedance of grid-following inverter, and by adopting a method of selecting the standard value of the self-adaptive impedance and harmonic content. The effective coordinated management of grid-connected harmonic voltage and harmonic current is realized. Finally, the effectiveness and control robustness of the proposed strategy are verified by simulation. © beijing Paike Culture Commu. Co., Ltd. 2024.

关键词： Power quality

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The hybrid simulation step modelling approach for the CLCC based HVdc transmission system 12

The hybrid simulation step modelling approach for the CLCC b...

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12th International Conference on Renewable Power Generation, RPG 2023

作者： Yin, Congqi Xu, Ying Yang, Jun Liu, Hong Li, Ming State Grid Economic and Technological Research Institute Co. Ltd. Changping Beijing China State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Changping District Beijing China

The commutation failure is one of the most significant and frequent problems affecting the operation stability and power quality of the line commutated converter (LCC) based HVdc system. In order to mitigate the commutation failure, a new type of controllable line commutated converter (CLCC) is proposed and implemented in the world's first CLCC project in China. However, the operation characteristics of the CLCC is causing the dynamic performance changes of the HVdc system due to the power electronic components contained, which brings a challenge to the simulation steps of the modelling of the whole CLCC based HVdc system. Therefore, this paper discusses a hybrid simulation modelling approach of the CLCC in order to accurately describe the steady and dynamic performance of the CLCC based HVdc system. The control scheme of the CLCC is also discussed to demonstrate the commutation failure mitigation method of the CLCC compared to the traditional LCC based transmission system. © The Institution of Engineering & technology 2023.

关键词： Power quality

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