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6th International Conference on HVdc, HVdc 2024

作者： Deng, Nan Yang, Bingjian Yang, Jun Jiang, Haiwei Liu, Guangshuo Xu, Bin State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Beijing China State Grid Liaoning Power Company Limited Economic Research Institute Shenyang China

ISBN: (纸本)9798350387759

The full-half bridge hybrid modular multilevel converter (MMC) HVdc exhibits advantages in self-clearing dc faults and flexible access. The CLCC-based HVdc retains low-loss and high-reliability, resolving commutation failures. In this paper, a novel MMC-CLCC hybrid dc transmission system topology is presented, incorporating a full-half bridge hybrid MMC at the sending side and a CLCC at the receiving side. Appropriate control strategies are designed for various operational scenarios, including steady-state operation and AC and dc fault modes. The MMC-CLCC system's simulation model is constructed on the PSCAD platform. Its results show that the new hybrid HVdc system has all the advantages of them. Under the proposed strategy, the system can achieve stable power transmission, and has the ability of AC and dc fast fault ride-through capability. © 2024 IEEE.

关键词： controllable line commutated converter full-half bridge hybrid hybrid HVdc transmission system modular multilevel converter

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The Simultaneous Improvement of Energy Storage Density and Self-Healing Property of Metallized Film 14

The Simultaneous Improvement of Energy Storage Density and S...

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14th International Conference on the Properties and Applications of Dielectric Materials, ICPADM 2024

作者： Zhang, Ting Cheng, Lu Hu, Di Zhang, Xinghui Xing, Zhaoliang Li, Hui Guo, Shaowei Liu, Wenfeng Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China State Grid Anhui Electric Power Research Institute Hefei China State Grid Corporation of China Beijing China State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350374605

In the present study, to improve the energy storage density and the self-healing property simultaneously, the double layer structure metalized film with the polyvinyl alcohol (PVA) coated on BOPP was proposed. With the increasing thickness of the PVA layer, the dielectric constant was raised, and the dc breakdown strength of the PP/PVA films first rising and then decreasing. Besides, the breakdown strength showed polarity dependence, and thus the highest breakdown strength 727.9 kV/mm was achieved with the PVA thickness of 2 μm, and the positive voltage applied on the PP side. The highest energy storage density of 5.97 J/cm3 was obtained that was 63.56% higher than the neat PP film. Moreover, the self-healing energy and the equivalent conductivity decreased as the thickness of PVA went up, corresponding to the reduced capacitance loss and the suppressed temperature-rise of metalized film capacitor. The improvement of energy storage density and the self-healing properties were originated from the interface of PP and PVA layer and the optimized ingredients of the lower ratio of C/(H+O). The present study provides the new orientation for the development of dielectric material for metalized film capacitors. © 2024 IEEE.

关键词： Film capacitor

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dc FAULT RIDE-THROUGH for WIND POWER INTEGRATION VIA MMC-HVdc BASED on PRECISE CONTROL of ENERGY STORAGE CONFIGURED INSIDE WIND FARM

DC FAULT RIDE-THROUGH for WIND POWER INTEGRATION VIA MMC-HVD...

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

作者： Sun, Yinfeng Guo, Yuhang Fan, Fulin Fan, Jiabin Li, Guoqing Wang, Zhenhao Wu, Xueguang Jilin China School of Electrical Engineering and Automation Harbin Institute of Technology Harbin China Department of Electronic and Electrical Engineering University of Strathclyde Glasgow United Kingdom State Grid Smart Grid Research Institute Beijing China Beijing Key Laboratory of DC Power Grid Technology and Simulation Beijing China

ISBN: (纸本)9781839539848

The modular multilevel converter-based high voltage direct current (MMC-HVdc) overhead lines transmission scheme is the preferred option for wind power integration, though it is susceptible to dc faults. To ensure the connection of a wind farm (WF) to the grid during dc faults, this paper proposes a coordinated control strategy for dc fault ride-Through (FRT) based on the energy storage system configured inside the WF for wind power integration through a bipolar MMC-HVdc. In the case of an instantaneous dc fault, the non-fault pole is regulated to operate at full power state to maximise wind power transmission. The exceedance of available wind power outputs over the transmission capacity of the non-fault pole is then accurately allocated to the internal energy storage units (ESUs) of wind generators (WGs) in order to ensure the power balance of the system and reduce the state of charge variance of ESUs as soon as possible. In order to reduce the energy capacities of ESUs required to store the excessive wind power in the event of a permanent dc fault, the method of step-by-step removing WGs is adopted to ensure the system power remaining balanced when the internal ESUs of the disconnected WGs are out of operation. The model is developed and carried out on the PSCAD/EMTdc simulation platform to verify the effectiveness of the proposed control strategies. © The Institution of Engineering & technology 2023.

关键词： Poles

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Dynamic performance of Controllable Line-Commutated Converter (CLCC) in HVdc systems with weak sending end AC network 6

Dynamic performance of Controllable Line-Commutated Converte...

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6th IEEE International Electrical and Energy Conference, CIEEC 2023

作者： Yang, Jun Gao, Chong He, Zhiyuan He, Dongshan Zhang, Jing State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350346671

Both the sending end and the receiving end AC network of long distance HVdc systems are getting weaker and weaker, with fast growing renewable energy penetration under 'dual carbon' scenario. The inherent defect of HVdc-commutation failure has become a more prominent problem. The Controllable Line-Commutated Converter (CLCC) raised recently has been proved to be effective to eliminate commutation failure. This paper aims to discuss the dynamic performance of CLCC in HVdc systems with weak sending end AC network. Firstly, the circuit topology and operation principle of CLCC are introduced. Then the dynamic performance of CLCC is theoretically analyzed. Finally, the dynamic performance of the proposed method is validated by simulation on the developed 500kV/1.2kA CLCC HVdc model in PSCAD/EMTdc. And the result shows that compared with LCC-HVdc system, CLCC-HVdc can significantly reduce the impact of active power and reactive power fluctuation imposed on the sending end AC network during the AC fault at the receiving end and greatly improve the stability of the electric power system. © 2023 IEEE.

关键词： Reactive power

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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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Influence of Different Square Resistances of dc Support Capacitor Components on Their Self-healing and Withstand Voltage Performance 5th

Influence of Different Square Resistances of DC Support Capa...

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5th International Symposium on Plasma and Energy Conversion, iSPEC 2023

作者： Guo, Shaowei Xing, Zhaoliang Fan, Guiyou Zhang, Chong Chen, Xin Su, Yaotian Liu, Juyang Zhang, Wenjing Fan, Yankun State Key Laboratory of Advanced Power Transmission Technology State Grid Smart Grid Research Institute Co. Ltd Beijing China EHV Branch Company of State Grid Fujian Electric Power Co. Ltd Fuzhou China

ISBN: (纸本)9789819722440

As the key equipment of dc converter valve in flexible dc transmission, dc support capacitor mainly plays the role of voltage support and harmonic filtering, which requires it to be safe, reliable and resistant to high breakdown voltage. As an important parameter of capacitor, the square resistance of metallized film is related to the self-healing and withstand voltage performance of capacitor. In this paper, three kinds of square resistance metallized film capacitor components are selected to carry out ESR, self-healing test, limit voltage withstand test and other experimental studies. The experimental results show that the high square resistance capacitor has good self-healing and withstand voltage performance, but its ESR will also increase. It is necessary to comprehensively consider the selection of capacitor square resistance range. © The Author(s), under exclusive license to Springer Nature Singapore Pte Ltd. 2024.

关键词： Capacitor bank

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Fault location discrimination and protection strategy for dc distribution network based on PET 2

Fault location discrimination and protection strategy for DC...

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2nd International Conference on smart grid and Energy Internet, SGEI 2022

作者： Liu, Zongye Yu, Hongyang Zhou, Ding Zhang, Xiaoyu Lu, Zhengang State Key Laboratory of Advanced Transmission Technology State Grid Smart Grid Research Institute Co. Ltd. Changping Beijing China

After the bipolar short circuit fault occurs on the low-voltage dc side of the low-voltage dc distribution network with a power electronic transformer, the fault current amplitude is high and the rise speed is fast, which leads to the rapid locking of power electronic devices, and the loss of fault information of line protection. Based on the multi-branch dc distribution network with CHB-type PET, this paper proposes a fault current limiting strategy. PET starts current limiting measures after detecting the dc side fault, which can provide stable and continuous fault transient information for line protection while providing a small amount of short circuit current. On this basis, using the fault current at both ends of the line, longitudinal polarity protection without strict communication synchronization is proposed. The simulation analysis based on PSCAD/EMTdc software shows that the scheme can realize fast and reliable fault line selection and has strong resistance to transition resistance. © Published under licence by IOP Publishing Ltd.

关键词： Electric power distribution

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Analysis of the Suppression Effect of Series Virtual Resistors on Sub-synchronous Oscillation of New Energy 11

Analysis of the Suppression Effect of Series Virtual Resisto...

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11th International Conference on smart grid and Clean Energy Technologies, ICSGCE 2023

作者： Yu, Hongyang Liu, Zongye Zhao, Guoliang Wang, Yingpei State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350305364

The vigorous development of new energy has promoted China's energy transformation and pointed out a new direction for China's energy strategy. However, as the capacity of new energy grid connection increases, its interaction with the system strengthens, causing fundamental changes in the local system impedance characteristics and leading to phenomena such as sub-synchronous oscillation. Currently, there has been extensive research from the perspective of optimizing the characteristics of new energy units, but there is less research on changing the local system impedance characteristics from the perspective of the power grid. This article first analyzes the differences in the effect of virtual resistance on system impedance under different access modes, proposes a virtual resistance control strategy based on chain-type converter, and finally analyzes and verifies the suppression effect of virtual resistance strategy on system sub-synchronous oscillation through semi-physical closed-loop simulation of the control system. The study shows that series access mode is more suitable for changing the equivalent impedance of the local system from the network side. By adding virtual resistance at the sub-synchronous frequency, it can effectively improve damping and suppress sub-synchronous oscillations in the system. © 2023 IEEE.

关键词： chain converter HIL simulation subsynchronous oscillation virtual resistance

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Design of Capacitive Digital Isolation Chip 4

Design of Capacitive Digital Isolation Chip

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4th International Conference on Power Engineering, ICPE 2023

作者： Ke, Jinkun Ma, Weiwei Xu, Hangyu Yin, Yibo Huang, Xuequan State Grid Smart Grid Research Institute Co. Ltd. State Key Laboratory of Advanced Power Transmission Technology Beijing China

ISBN: (纸本)9798350340020

Isolation refers to the physical isolation of a circuit through transformers, capacitors, and optocouplers, which can prevent dc and harmful AC currents from passing between two parts of the system, but allows for signal and power transmission. By adopting a gate capacitor scheme that can be integrated into standard CMOS processes, compared to using transformers or optocouplers as integrators and traditional discrete device isolation circuits, capacitive isolation can greatly reduce the volume occupied and facilitate miniaturization of related applications. This article proposes a capacitive digital isolator scheme, which achieves good characteristics of blocking interference transmission during digital signal transmission through OOK modulation and FSK demodulation. The specific circuit design is carried out using the Huahong BCD350GE process, which mainly includes two modules: transmitter TX and receiver, and is simulated and verified through Cadence Virtuoso. The simulation results show that the isolation chip can operate normally within the power supply range of 3.3-5V, with a temperature range of -40°C-120°C, a maximum data transmission rate of 25Mbps, a delay of 20.82ns, and a pulse width distortion of 10.11ns. Under a l5pF capacitive load and 5V power supply, the maximum power consumption is l8.91mW. © 2023 IEEE.

关键词： Demodulation

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HPDS133-bus:A Benchmark Test System for Distribution Systems with High Penetration of Distributed Generation

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CSEE Journal of Power and Energy Systems 2023年第3期9卷 963-977页

作者： Fengzhang Luo Chongbo Sun Xin Yang Tianyu Zhang Chengshan Wang Jun Xiao Liangzhong Yao Lingzhi Zhu Minhui Qian Key Laboratory of Smart Grid of Ministry of Education Tianjin UniversityTianjin 300072China State Grid Economic and Technology Research Institute Co. Ltd.Changping DistrictBeijing 102209China Ultra High Voltage Company State Grid Henan Electric Power CompanyZhengzhou 450007China Economic and Technology Research Institute State Grid Tianjin Electric Power CompanyTianjin 300171China School of Electrical Engineering and Automation Wuhan UniversityWuhan 430072China China Electric Power Research Institute Xiaoying RoadBeijing 100192China

The benchmark test system for distribution systems is necessary and important for system analysis and result data *** order to meet the development demand of the distribution systems which integrate with a high penetration of distributed generation(DG),a benchmark test system for the distribution systems which adapts to current and future development trends is *** on the concentric zone theory and the typical regional settlement model in China,three typical distribution system scenarios corresponding to different system circle structures and regional development characteristics are designed in this *** order to adapt to the trend that the distribution systems will present the mixed state of AC and dc,a typical improvement scheme of distribution systems in urban scenario is *** benchmark test system of low-voltage distribution systems in a rural scenario is also designed because of the high penetration of ***,the system structure,load parameters,integrated capacity and output characteristics of varies types of DG in different scenarios are described in ***,the simulation results,such as the time series power flow,reliability evaluation and hosting capacity of DGs are *** benchmark test system proposed in this paper will lay a foundation for future research on distribution systems with a high proportion of DG and effectively support the distribution systems planning,design,operations and dispatches.

关键词： Benchmark test system distribution systems DG PV typical scenario

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