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检索条件"机构=State Key Laboratory of Power System Operation and Control"

共 2633 条记录，以下是191-200 订阅

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Research on the Stage Division Standard for the Transient Response in Active Distribution Networks 7

Research on the Stage Division Standard for the Transient Re...

引用

7th IEEE Conference on Energy Internet and Energy system Integration, EI2 2023

作者： Hu, Shanhua Li, Yalou Zhang, Xing Mu, Qing Ma, Linlin Miao, Weiwei China Electric Power Research Institute State Key Laboratory of Control and Operation of Renewable Energy and Storage Systems Beijing China Dispatch Control Center Control Office State Grid Shandong Electric Power Company Beijing China

ISBN: (纸本)9798350345094

With the increasing integration of a significant number of Inverter-Based Distributed Generators (IBDGs), the transient characteristics on the low-voltage distribution network side have undergone substantial changes, rendering traditional stage division standards less applicable. This paper proposes a novel stage division standard for the transient response in Active Distribution Networks (ADNs), serving as a crucial tool for a more profound analysis of the interactions between ADNs and the transmission network. The paper begins by developing an electromagnetic model using a real ADN then performs large disturbance simulations for ADNs at different penetration levels, and introduces a new segmentation criterion based on the external characteristics of ADNs under large disturbances. By formulating mathematical models for the components within the ADN during transient stages, this paper delves into a mechanistic analysis of the external characteristics of ADNs at each phase and identifies key factors influencing the external characteristics in various stages. © 2023 IEEE.

关键词： Transient analysis

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Research of Data Synchronization Measurement and Optimization Method for Medium Voltage Photovoltaic power Generation Unit 17th

Research of Data Synchronization Measurement and Optimizatio...

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17th Annual Conference of China Electrotechnical Society, CES 2022

作者： Chen, Zhilei Yang, Qingbin Xia, Lie Xu, Lianghui State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems Beijing China China Electric Power Research Institute Beijing China

ISBN: (纸本)9789819904075

Medium voltage direct-connected is an important technical direction in PV power generation domain. Because of large capacity, high efficiency and power density, medium voltage photovoltaic power generation unit (MV-PGU) has become a new application form. But carry out actual efficiency measurement and verification of this power generation unit is difficult and costly, because of high voltage level, large capacity and numerous DC input branches of MV-PGU. This article analyzed the test difficulties of MV-PGU, propose a measurement optimization method based on time-sharing test and uniformity analysis, and carry out empirical test on MV-PGU system to verified the feasibility of this method. © 2023, Beijing Paike Culture Commu. Co., Ltd.

关键词： Efficiency

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Research on Modeling of Current Transformer for Travelling Wave Fault Location Test 10th

Research on Modeling of Current Transformer for Travelling W...

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10th Frontier Academic Forum of Electrical Engineering, FAFEE 2022

作者： Cui, Liu Li, Shuyong Huang, Libin Guo, Qi Deng, Lijun State Key Laboratory of HVDC Electric Power Research Institute China Southern Power Grid Guangzhou510663 China National Energy Power Grid Technology R and D Centre Guangzhou510663 China Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou510663 China CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou510663 China

ISBN: (纸本)9789819934034

In order to test the travelling wave fault location devices that widely used in power system, a simulation model that can reflect the transformer characteristics of travelling waves on the transmission channel should be built. In this paper, the current transformer (CT) on the transmission channel is modelled, then the CT attenuation characteristic to travelling waves is proved by adding sine wave and square wave on the CT primary side. By using PSCAD and travelling wave fault locator examiner, a half-real time simulation environment is constituted to test the travelling wave fault locator. In PSCAD, CT is modeled by measuring parameters. Finally, amplitude frequency response characteristics of the actual CT and the CT model are compared. The result shows that simulation model in this paper reflects well on the CT high-frequency attenuation characteristic. © Beijing Paike Culture Commu. Co., Ltd. 2023.

关键词： Electric instrument transformers

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Influence of new energy at the sending end on the calculation of single-end equivalent model of LCC-HVDC sending system 12

Influence of new energy at the sending end on the calculatio...

引用

12th International Conference on Renewable power Generation, RPG 2023

作者： He, Xiaocai Wang, Bin Dong, Xinzhou Zhang, Minglong Chao, Wujie Huang, Junwei Dai, Liyu National Key Laboratory of New Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing China State Grid Fujian Electric Power Co. Ltd. Electric Power Science Research Institute Fujian China

The short circuit current characteristics of LCC-HVDC transmission system are directly related to the action characteristics of AC protection at the inverter side. However, the single-end equivalent model of the existing LCC-HVDC transmission system regards the sending end as a pure traditional AC power supply, and the equivalent error is large when the sending end contains a high proportion of new energy. Based on the dynamic phasor equivalent calculation framework, this paper establishes a single-end equivalent model of the LCC-HVDC transmission system based on the AC information of the inverter side only, and analyzes the impact of different new energy proportion scenarios on the single-end equivalent error and the causes of the error. In this paper, simulation verification is carried out under the scenario of multiple new energy ratios at the sending end. The results show that the simulation error of the single-end equivalent model increases with the increase of the proportion of new energy, which reduces the credibility of the single-end equivalent calculation. © The Institution of Engineering & Technology 2023.

关键词： Errors

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A Simple power Loss Evaluation Method for High-Frequency Transformers Based on Surface Temperature Measurement Within Wide operation Range

A Simple Power Loss Evaluation Method for High-Frequency Tra...

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Annual IEEE Conference on Applied power Electronics Conference and Exposition (APEC)

作者： Zheyuan Yi Zengyang Liu Kai Sun Bowen Su Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

power loss measurement and evaluation form the foundation of loss modeling and optimization. This paper proposes a method for evaluating power loss in high-frequency (HF) transformers operating under forced air-cooling conditions, simply based on surface temperature measurement with a thermal camera. A direct correlation is established between power loss and surface temperature, utilizing a simplified thermal network. This method enables the measurement of both total loss and individual core loss and winding loss directly for HF transformers operating within the whole range of normal working conditions. Simulations are conducted to validate the practicality and accuracy of the proposed method. Experiments are carried out on a HF transformer prototype, following the proposed loss evaluation process, validating the accuracy of the evaluated power loss within wide operation range in loaded tests.

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Partial Discharge Sensing of Fiber Composed Submarine Cable based on φ -OTDR 7

Partial Discharge Sensing of Fiber Composed Submarine Cable ...

引用

7th IEEE International Electrical and Energy Conference, CIEEC 2024

作者： Liao, Yanqun He, Wei Nan, Baofeng Li, Lei Li, Yunbo Zhang, Haoran Wang, Hang Zhuhai Power Supply Bureau of Guangdong Power Grid Co. Ltd Zhuhai China Hubei Key Laboratory for High-efficiency Utilization of Solar Energy and Operation Control of Energy Storage System Hubei University of Technology Wuhan China

ISBN: (纸本)9798350359558

The partial discharge generated by operation voltage applied on insulation defects is one of the main reasons leading to the failure of HV submarine cables. However, the pulsed current method which is widely adopted by partial discharge cable on the land is unable to obtain high frequency pulsed signal due to attenuation of the long submarine cable. In this paper, a heterodyne interferometric phase-sensitive optical time reflectiont φ -OTDR) based method is proposed to detect the partial discharge acoustic disturbance on the composed fiber in the submarine cable. The methodology consists of the signal sampling of the balanced photodetector, orthogonal IQ demodulation, phase threshold expansion, and unwinding. The proposed methodology is verified by the partial discharge experiment by a preset insulation defect in a 110 kV single-core submarine cable. The results show that the partial discharge can be distinguished by the phase fission. Besides, the location error is within 10 meters. © 2024 IEEE.

关键词： Partial discharges

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Advanced Photovoltaic Flexible power control Method Under Fast Changing Irradiance in Distributed PV-BESS system

Advanced Photovoltaic Flexible Power Control Method Under Fa...

引用

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

作者： Qiang Bi Kai Sun Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9798350361001

ISBN: (纸本)9798350361018

Flexible power control (FPC) for distributed PV-BESS systems has been presented in the past years to extend the service life of the energy storage unit. The photovoltaic(PV) works with the flexible power tracking mode to control the DC bus voltage, which can reduce the work of the energy storage unit. The existing FPC method works well with slow-changing irradiance. However, the DC voltage will be unstable when the irradiance changes fast or there is a change in the load. So, an advanced FPC method for PV is proposed in this paper. The proposed FPC keeps the DC voltage moving around the voltage reference with a limited wave. Compared with the existing FPC method, the proposed FPC for PV systems is much more effective under various working conditions. Followed by theoretical analysis, the simulation results validate the claimed advantages of the proposed solution.

关键词： Photovoltaic systems Employee welfare Simulation power control power electronics Distributed power generation Voltage control

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Optimal Scheduling of Active-Reactive power for PV-BES system Considering Voltage Support and Frequency Regulation

Optimal Scheduling of Active-Reactive Power for PV-BES Syste...

引用

Annual Conference of Industrial Electronics Society

作者： Jiamei Zhang Kai Sun Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9781665464543

ISBN: (纸本)9781665464550

The voltage support capability of renewable resources (RES) is emphasized by grid codes for stable and secure operation faced with grid faults. However, there is another problem occurs when the penetration of RES is boosting. The capability occupation due to injected power for voltage support leads to the decrease of output power for loads, which may result in frequency issues when the inertia of the system decreases. To guarantee the voltage and frequency security during fault ride through (FRT) process, this paper proposes an optimal scheduling scheme for PV-BES system considering voltage support and frequency regulation. In the optimal model, in order to map the voltage and frequency constraints into power constraints, the evaluation model of required injected power for voltage support is formulated firstly. Based on center of inertia theorem and time scale characteristics of FRT, the frequency deviation is represented by distributed generator (DG) adjustment. The voltage and frequency constraint are incorporated into the optimal scheduling model and the quasi-steady-state of the PV-BES system during FRT can be analyzed. The proposed method is fully tested, and the results demonstrate that with the proposed method, the voltage and frequency security can be well guaranteed.

关键词： Time-frequency analysis Renewable energy sources Job shop scheduling power quality Optimal scheduling Regulation Security Voltage control Frequency control power generation

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Software and hardware design of microcomputer relay protection device based on DSP 2

Software and hardware design of microcomputer relay protecti...

引用

2023 2nd International Conference on power system and power Engineering, PSPE 2023

作者： Huo, Jingchong Meng, Runquan Li, Shengwen Liu, Qiang Shanxi Key Lab of Power System Operation and Control Taiyuan University of Technology Taiyuan030024 China Electric Power Research Institute State Grid Shanxi Electric Power Company Taiyuan030001 China

The research on fault protection technology of AC power grid in AC/DC hybrid microgrid is very mature, while the research on fault protection technology of DC microgrid is still in the development stage. Therefore, the research and development of necessary power electronics and protection devices have become a research hotspot in recent years. In this paper, a microcomputer protection device based on the TMS320F28335 chip is developed. Considering the anti-interference of field use, detailed hardware and software design is carried out. The debugging effect is good, and the low-voltage DC short-circuit fault protection function can be reliably realized. © Published under licence by IOP Publishing Ltd.

关键词： Microcomputers

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Influence of Thermal Conductivity of Multi-scale Particles Epoxy Composites on High-Frequency Electrical Insulation Property

Influence of Thermal Conductivity of Multi-scale Particles E...

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IEEE International Conference on Dielectrics (ICD)

作者： Yan-Hui Song Zhi-Min Dang Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9798350308976

ISBN: (纸本)9798350308983

Epoxy, with excellent electrical insulation properties, processing performance, and low price, is commonly used for transformers (110kV and below) and power electronic transformers (high-frequency transformers) as the primary insulating material. Since the thermal conductivity of epoxy resins is only 0.2 W/(m·K), the electrical insulation properties decline significantly at high frequency. Preparing epoxy composites with high thermal conductivity and excellent electrical insulation at high frequencies is a great challenge for industrial production. It is considered that SiO 2 (9 eV), BN (5.9 eV), and Al 2 O 3 (7.2-8.8 eV) are thermally conductive particles with good electrical insulation properties. The materials filled with different micron-scale particles have higher thermal conductivity than the nanofilled materials. In this study, 5 μm SiO 2 , 25 μm BN, and 40 μm Al 2 O 3 were used as fillers, and the filler ratios were calculated according to the Dinger-Funk model, focusing on the effects of the variation of filler content on thermal conductivity and electrical insulation properties. The thermal conductivity of the epoxy composites improved with the increase of filler content up to 1.003 W/(m·K), while the AC breakdown field strength gradually decreased. However, the breakdown time at 20 kHz, 35 kV/mm bipolar square wave appeared to increase and then decrease with the increase of content. Therefore, the optimum content of fillers allows the preparation of efficient epoxy composites as insulating materials for power electronic transformers. This study provides ideas for designing thermally conductive composites operating at high frequency and high voltage fields.

关键词： Silicon compounds Insulation Electric breakdown High-voltage techniques Conductivity Thermal conductivity power electronics

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