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Microstructural Evolution of Uniaxially Stretched Polypropylene Films and Its Effect on Electrical Properties

Gaodianya Jishu/High Voltage Engineering 2025年第5期51卷 2260-2267页

作者： Wang, Xinjie Huang, Lei Song, Yanhui Wang, Jiantao Zhong, Shaolong Dang, Zhimin State Key Laboratory of Power System Operation and Control Department of Electrical Engineering Tsinghua University Beijing100084 China

Polypropylene (PP), a semi-crystalline polymer widely used in film capacitors, has a crystalline structure that influences the electrical properties of the material, leading to variations in the energy storage performance of capacitors. controlling the crystalline structure of PP to better regulate the electrical properties of PP films is key to enhancing the energy storage characteristics of capacitors. In this study, a series of uniaxially stretched polypropylene films with varying thicknesses were prepared. The differences in their crystalline morphology were characterized using polarizing microscopy, atomic force microscopy, two-dimensional X-ray scattering, and differential scanning calorimetry. Subsequent investigations were conducted on the trap parameters, DC breakdown strength, dielectric properties, and energy storage characteristics of the oriented PP films. The results indicate that thinner PP films not only improve the surface roughness of the films but also facilitate the formation of highly oriented shish-kebab fibrous crystalline structures. The highly oriented crystalline structure helps to optimize the trap distribution within the material, thereby promoting the dissipation of charges on the film’s surface and enhancing the insulating performance of the material. © 2025 Science Press. All rights reserved.

关键词： Capacitor storage

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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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MPC Implementation for Optimal Active power control of Large-Scale Wind-PV-Battery Hybrid system

MPC Implementation for Optimal Active Power Control of Large...

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Chinese control Conference (CCC)

作者： Zihan Zhang Zhongwei Lin Ze Zhao Jiawei Zhou Chenzhi Qu State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources School of Control and Computer Engineering North China Electric Power University Beijing P. R. China

This paper investigates the operational strategy for real-time optimal active power control of large-scale wind-PV-battery hybrid system. The MPC strategy is established with objective, forecast models and constraints for active power control of wind-PV-battery hybrid system, which simultaneously maximizes tracking accuracy and minimizes settling time. To guarantee the industrial reliability, the corresponding optimization solver and control architecture have been specifically developed and designed. Hardware-in-loop (HIL) experiments are conducted using the real-time digital simulator (RTDS) and programmable logic controllers (PLCs). Under different operating scenarios, HIL-RTDS testing results demonstrate that the MPC strategy significantly improves the tracking speed and accuracy compared to the conventional strategy in both normal and abnormal operating scenarios, which also sustain the feasibility of industrial implementation.

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simulation of Fast Cascading Failures Considering Voltage Ride Through Capability of Renewable Generation

Simulation of Fast Cascading Failures Considering Voltage Ri...

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

作者： Dongbao Lv Shanshan Qiu Yujun Zhou Changgang Li Junjun Yang Wei Xu Xing Lei Changhui Ma Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China NARI Group Corporation State Grid Electric Power Research Institute Nanjing China State Grid Shanghai Municipal Electric Power Company Shanghai China Shandong Smart Grid Technology Innovation Center State Grid Shandong Electric Power Company Electric Power Science Research Institute Jinan China

ISBN: (数字)9798331523527

ISBN: (纸本)9798331523534

With the rapid development of renewable generation, the evolution process of fast cascading failures in the power system with a high proportion of renewable generation turns out to be more complicated. There are few existing fast cascading failure models that take into account the voltage ride through (VRT) capability of renewable generation. The portrayal of the dynamic characteristics of renewable generation still needs to be improved. In response to this, the VRT control model and VRT protection model have been established to comprehensively depict the output characteristics and disturbance tolerance capability of renewable generation in fast cascading failures. Finally, the simulation results of the AC-DC hybrid receiving-end system with a high proportion of renewable generation show that the established models can effectively depict the influence of VRT capability of renewable generation in fast cascading failures, providing a more comprehensive basis for the analysis of fast cascading failures under the access of a high proportion of renewable generation.

关键词： Renewable energy sources Voltage fluctuations simulation power system protection power system dynamics system integration Delays power system faults Voltage control Transient analysis

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Investigation of The Anti-icing Performance of Superhydrophobic Silicone Rubber

Investigation of The Anti-icing Performance of Superhydropho...

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2022 IEEE International Conference on High Voltage Engineering and Applications, ICHVE 2022

作者： Liu, Shuming Liu, Shuqi Wang, Qian Zuo, Zhou Wang, Tingting Luo, Bing Liang, Xidong Tsinghua University State Key Laboratory of Control and Simulation of Power System and Generation Equipment Department of Electrical Engineering Beijing100084 China Csg Electric Power Research Institute Co. Ltd. Guangzhou510663 China The Natl. Eng. Res. Ctr. for Ultra High Voltage Eng. Technol. and Innov. Elec. Equipment Foundation China

ISBN: (数字)9781665407502

ISBN: (纸本)9781665407502

Composite insulators, as an important part of outdoor transmission lines, always suffer from various environmental stress, and the large-scale icing accretion problem is one of the dangerous threats. In this paper, superhydrophobic silicone rubber was prepared by surface coating method, and its anti-icing performance compared with pristine silicone rubber was investigated. The superhydrophobic surface can repel water droplets so that the droplets can be removed easily before freezing. For the sessile droplets, the freezing speed on the pristine silicone rubber is faster than the process on coated silicone rubber. After completing freezing, the deicing force on pristine silicone rubber is bigger than that on coated silicone rubber. In summary, the superhydrophobic silicone rubber showed more excellent performance in inhibiting ice accretion than the pristine silicone rubber, and it is a potential solution to the icing problem in the power system. © 2022 IEEE.

关键词： Electric power transmission

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Building a Large-Scale Intrinsically-Safe Energy Storage system by Using Retired EV Batteries

Building a Large-Scale Intrinsically-Safe Energy Storage Sys...

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International Conference on power Electronics systems and Applications (ICPESA)

作者： Congjia Zhang Qi Yu Yanglin Zhou Yuxin Li Baochang Liu Ende Lin Song Ci Department of Electrical Engineering Tsinghua University Beijing China China Three Gorges Corporation Wuhan China State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China

ISBN: (数字)9798350365801

ISBN: (纸本)9798350365818

Utilizing retired batteries in energy storage systems (ESSs) poses significant challenges due to their inconsistency and safety issues. The implementation of dynamic reconfigurable battery networks (DRBNs) is promising in maintaining the reliability and safety of battery energy storage systems (BESSs). Recently, large-scale BESSs based on DRBN have been deployed with the use of retired batteries, but the operational performance of these systems in real-world working conditions still remains uncertain. To bridge the research gaps, a case analysis is conducted based on the operational data from a real-world large-scale retired BESS. First, the framework of the retired BESS and the structure of the DRBN are illustrated in detail. Then, the core principle of DRBN is comprehensively demonstrated in terms of energy digitization and time-oriented battery management mode. Finally, the operational results indicate that the ESS can effectively improve the voltage and capacity consistency of battery modules and realize efficient thermal management to improve systematic safety of the retired BESS.

关键词： Thermal management of electronics systematics Battery management systems Voltage Thermal management Thermal conductivity Batteries

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Big data service capability of enterprise-scale data middle platform

Big data service capability of enterprise-scale data middle ...

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Tsinghua University-IET Electrical Engineering Academic Forum: Constructing Green and Sustainable Energy system 2021

作者： Chen, Lianfu Wang, Xuan Peng, Fang Liu, Shi State Key Laboratory of Control and Simulation of Power System and Generation Equipments Tsinghua University Beijing China Department of Electrical Engineering Tsinghua University Beijing China Big Data Center of State Grid Corporation of China Beijing China

ISBN: (纸本)9781839536199

With the rapid development of technologies such as big data, cloud computing, Internet of things and artificial intelligence, electric power enterprises are faced with the strategic deployment of digital transformation. By upgrading IT architecture, power grid companies build the data middle platform, and separate the data operation and product technology from its front platform. Through service reusing and data sharing, the business capability can be shared, which providing technical support for power enterprises to serve a variety of complex business scenarios. This paper focuses on the architecture design of data middle platform in power grid companies, and analyzes its service capability. In addition, this paper sorts out the capability output framework of big data middle platform, and analyzes the data service requirements and application modellings for data middle platform in different business scenarios. © 2021 Institution of Engineering and Technology. All rights reserved.

关键词： Big data

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Optimal Configuration of Energy Storage Capacity in Wind-Storage Joint Frequency Regulation

Optimal Configuration of Energy Storage Capacity in Wind-Sto...

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power Science and Technology (ICPST), IEEE International Conference on

作者： Ling Hao Fei Xu Lei Chen Qun Chen Yong Min Yi Gu Yiming Chang Department of Electrical Engineering State Key Laboratory of Power System Operation and Control Tsinghua University Beijing China Department of Engineering Mechanics Key Laboratory for Thermal Science and Power Engineering of Ministry of Education Tsinghua University Beijing China State Grid Liaoning Electric Power Co. Ltd. Liaoning China

We propose combining energy storage control with pitch control of wind turbines to give wind farms a primary frequency regulation capability similar to thermal power units. Using chance-constrained programming to handle the relationship between reliability and operating cost, and considering the full life-cycle cost of energy storage, we establish a chance-constrained programming model with the objective of minimizing the wind-storage joint frequency regulation operating cost. This achieves a trade-off between operating cost and reliability of the wind-storage frequency regulation system. We use the ant-lion algorithm to solve the model and obtain the optimal configuration of energy storage power and capacity for the wind farm, and compare the optimization results of the ant-lion algorithm with those of the particle swarm algorithm and the genetic algorithm. A case study is presented to verify the effectiveness of the proposed model and algorithm.

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Research and Implementation of control Strategies for Multiple Transmission Modes in Yongren-Funing HVDC

Research and Implementation of Control Strategies for Multip...

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power systems and Electrical Technology (PSET), IEEE International Conference on

作者： Yukun Zhu Libin Huang Shuyong Li Yihua Zhu Xuantao Jia a. State Key Laboratory of HVDC Electric Power Research InstituteChina Southern Power Grid Guangzhou China b. Guangdong Provincial Key Laboratory of Intelligent Operation and Control for New Energy Power System Guangzhou China c. CSG Key Laboratory for Power System Simulation Electric Power Research Institute China Southern Power Grid Guangzhou China XJ Electric Co Ltd Xuchang China

The ± 500 kV Yongren-Funing HVDC transmission project is the first HVDC whose sending and receiving ends are both located in the same province, its inverter station is required to transmit power to different AC asynchronous grids according to the different requirements of the grid operation. The present control and protection system of HVDC cannot adapt to and meet the technical requirements of multiple power transmission modes. In order to achieve this goal, the control system of HVDC must be capable of automatic discrimination and sequential control, selecting the correct strategy of reactive power control (RPC), which is essential for the stable operation of the HVDC system. Therefore, based on the operating conditions of the HVDC system and the switch configuration of the AC switch yard of the inverter station, the principle, process and interlocking conditions of automatic switching between different transmission modes are systematically analyzed. Effects on RPC, last breaker and the over voltage protection of AC busbar are researched. The control strategies for multiple transmission modes have great significance for the similar HVDC/UHVDC transmission projects in the future.

关键词： Technical requirements Reactive power control HVDC transmission Design methodology Switches control systems Inverters

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Categorical Spatial Interpolation of Solar Irradiance for Regional Distributed Photovoltaic power Forecasting

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IEEE Transactions on Sustainable Energy 2025年

作者： Ruan, Chenglong Li, Kangping Li, Zhenghui Huang, Chunyi Wang, Fei Shanghai Jiao Tong University College of Smart Energy Shanghai200240 China Shanghai Jiao Tong University Shanghai Non-Carbon Energy Conversion and Utilization Institute Shanghai200240 China Ministry of Education Shanghai Jiao Tong University Key Laboratory of Control of Power Transmission and Conversion Shanghai200240 China North China Electric Power University Department of Electrical Engineering Baoding071003 China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Hebei Key Laboratory of Distributed Energy Storage and Microgrid North China Electric Power University Baoding071003 China

High-spatial-resolution (HSR) solar irradiance forecast data is important for regional distributed photovoltaic (PV) power forecasting. Distributed PV sites are widely geographically distributed and the cost of obtaining HSR irradiance forecast data with full regional coverage is very high. Improving spatial resolution through interpolation based on limited sparse irradiance forecast reference points is a low-cost and feasible approach. However, existing irradiance spatial interpolation methods would produce large errors under variable weather conditions (e.g., cloudy) with limited reference points, because local abrupt changes in irradiance usually occur under such weather conditions due to cloud movement. This paper proposes a categorical spatial interpolation method to improve the accuracy of distributed PV power forecasting with limited sparse irradiance forecast data. The method first converts satellite-derived shortwave radiation images into binary irradiance maps through adaptive thresholding, then trains a 3D U-net model to predict future irradiance category probabilities for each grid. These probability maps dynamically govern two parallel interpolation processes: one using reference stations in predicted clear-sky regions, another utilizing stations in cloudy zones, with final irradiance values determined by probability-weighted fusion. Case studies on a real dataset verify the effectiveness and superiority of the proposed method. © 2025 IEEE.

关键词： Solar irradiance

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