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2020 IEEE/IAS Industrial and Commercial power System Asia, I and CPS Asia 2020

作者： Zhang, Hongzhe Cong, Wei Kong, Hao Chen, Ming Wei, Zhen Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Ministry of Education Jinan China Qingdao Power Supply Company State Grid Shandong Electric Power Company Qingdao China

ISBN: (纸本)9781728143033

When the tie line of the AC/DC hybrid system fails, the change of the electrical quantity on the inverter side is different from that of the traditional infinite AC power source. Sensitivity and reliability of traditional relay protection methods will be affected. A longitudinal protection method for AC / DC hybrid system based on voltage waveform comparison is proposed. The method bases on the conclusion that the waveform characteristics of the reference voltage and the measuring voltage are different in the case of internal and external faults, roughly determine the fault location through the Pearson correlation coefficient. Use longitudinal protection logic to give more accurate judgment results. The simulation results of PSCAD model show that the scheme in this paper can accurately identify the fault of the tie line of the AC/DC hybrid system, and has high reliability and good applicability. © 2020 IEEE.

关键词： Correlation methods

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Identification of key Transmission Lines Based on Super Efficiency Data Envelopment Analysis Model

Identification of Key Transmission Lines Based on Super Effi...

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IEEE Asia power and Energy Engineering Conference (APEEC)

作者： Lingxu Guo Yuan Zeng Cheng Yao Xin Wang Wenxu Zhang Waiying Guo Power Dispatching and Control Center State Grid Tianjin Electric Power Company Tianjin China Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin China Tianjin Key Laboratory of Internet of Things in Electricity Tianjin Research Institute of Electric Science Tianjin China

Transmission lines are an important part of the power system. The selection of key transmission lines is conducive to the stable and safe operation of the transmission system. With the application of new technologies such as regional grid interconnection, wind power grid integration, and demand response, the internal structure and operating status of the power system are becoming more and more complicated. In view of this, this paper focuses on the comprehensive analysis and evaluation of key transmission line equipment, and proposes a comprehensive index calculation method based on the super-efficiency data envelopment analysis model to improve the key transmission line in the calculation of evaluation indicators. This paper also takes wind power and interruptible loads into consideration, uses situational awareness theory to divide the identification of key transmission lines into three phases: awareness phase, understanding phase, and prediction and presentation phase to evaluate and screen key transmission lines. Finally, taking the IEEE 24-node system as an example, the correctness and effectiveness of the method proposed in this paper are verified. The research work can provide useful references for system operators.

关键词： Analytical models power transmission lines Wind power generation Data models Safety Indexes Security

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Impact analysis of zero-sequence current rounding deviation on time-domain distance protection and its improved algorithm

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International Journal of Electrical power and Energy Systems 2025年 169卷

作者： Shao, Mingyu He, Jiawei Li, Bin Zhou, Bohao Li, Yan Xie, Zhongrun Cao, Runbin The Key Laboratory of Smart Grid of Ministry of Education Tianjin University Tianjin300072 China State Key Laboratory of Intelligent Power Distribution Equipment and System Tianjin University Tianjin300072 China National Industry-Education Platform for Energy Storage Tianjin University Tianjin300350 China Electric Power Research Institute of China Southern Power Grid Guangzhou510663 China Power Dispatching and Control Center of Guizhou Power Grid Co. Ltd. 55000 China

The time-domain distance protection performs well under the influence of renewable energy generation characteristics, such as frequency offset and phase controlled character, thus having outstanding application prospects in systems with renewable power generation accessed. But, it is discovered that, the fast time-domain distance protection algorithm based on weighted accumulation might mal-operate during system normal operation. The essential reason of this issue is rounding deviation of the zero-sequence current in the protection device. Therefore, this study analyses the effect of rounding deviation in zero-sequence current on the fast time-domain distance protection. And the improved time-domain distance protection algorithm, based on the random correction of zero-sequence current, is proposed. The corresponding protection prototype is developed based on the proposed algorithm. By simulation and hardware-in-loop experiments, it is fully demonstrated that the proposed algorithm effectively mitigates the influence of rounding deviation. Furthermore, the accuracy of distance calculation during faults is not adversely affected. © 2025 The Authors

关键词： Solar fuels

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A Novel Switched-Capacitor Five-Level T-Type Inverter 2

A Novel Switched-Capacitor Five-Level T-Type Inverter

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2nd International Conference on Smart grid and Renewable Energy, SGRE 2019

作者： Niu, Decun Hao, Tianqu Gao, Feng Qin, Futian Ma, Zhan Zhou, Kangjia Li, Wei Key Laboratory of Grid Intelligent Dispatching and Control Section Shandong University Jinan China

ISBN: (纸本)9781728129600

This paper proposes a novel switched-capacitor five-level T-type (SC-SLT) inverter with reduced number of switches and with self-voltage balancing and boosting voltage ability. It consists of eight switches, two diodes, two capacitors and a single de-source, The proposed inverter does not adopt a load-end H-bridge to change output voltage polarity. Besides, the modulation scheme only using one triangular carrier is proposed for the proposed topology. Moreover, self-voltage balancing ability of capacitor and capacitance calculation are discussed in detail. Finally, the performance of the proposed inverter has been validated by various simulation results using Matlab software. © 2019 IEEE.

关键词： Electric inverters

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Research on Electromagnetic Vibration Energy Harvester for Casing of Transformers

Research on Electromagnetic Vibration Energy Harvester for C...

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Electrical Engineering and Automation (IFEEA), International Forum on

作者： Liangyuan Chen Ke Zhou Dajian Li Jian Zhao Guangxi Key Laboratory of Intelligent Control and Maintenance of Power Equipment Electric Power Research Institute of Guangxi Power Grid Corporation Co. Ltd. Nanning Guangxi Zhuang Autonomous Region China Electric Power Research Institute of Guangxi Power Grid Corporation Co. Ltd Nanning Guangxi Zhuang Autonomous Region China Guangxi Power Grid Corporation Co. Ltd Nanning Guangxi Zhuang Autonomous Region China

ISBN: (纸本)9781665464222

In the daily inspection of the existing power system, a series of parameters such as temperature, pressure, flow rate, magnetic field and so on need to be obtained in time to ensure the safety and stability of the system. Therefore, the stable operation of the power sensor needs to be ensured. However, the energy problem is one of the key issues in the sensor, this article puts forward a kind of electromagnetic vibration energy harvester for transformer casing, and establishes the three-dimensional structural mechanics model of the device and magnetic field two axisymmetric model through the simulation software. Finally, the effective value of the output voltage of the device is 3.9V and the output power is 14.45mW, which verifies the feasibility of the design and research. The device has the advantages of simple structure, compact size, simplicity, economy and universality, which is conducive to the development of intelligent integrated monitoring system of transformer operation status, and improves the transformer operation level to a certain extent.

关键词： Vibrations Solid modeling Voltage power system stability Transformers Software Topology

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Optimization Scheme for the SSC Discrimination Logic of Xinsong-Dongfang HVDC under Small Islanded Operation Mode

Optimization Scheme for the SSC Discrimination Logic of Xins...

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IEEE International Conference on power and Energy Systems (ICPES)

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

ISBN: (纸本)9781665413268

The sending end of HVDC in islanded operation mode is a weak AC system, the security and stability control (SSC) system is very important for the operation of the islanded system. In this paper, the SSC strategy of Xinsong-Dongfang HVDC under islanded mode is deeply analyzed, and the defects and risks of the SSC discrimination logic for the small islanded operation mode is exposed during the RTDS simulation tests, as a result, some of the generators cannot be cut off. In addition, Then the research of the action sequence of SSC reveals the improper time coordination between the small islanded mode signal and the cut-off command. Based on the above work, an optimized scheme to discriminate the small islanded operation mode is proposed, and the correctness and effectiveness are verified through the same RTDS tests. This new method has great significance in the SSC design and implementation in HVDC transmission project with similar techniques.

关键词： HVDC transmission Standardization power system stability control systems Stability analysis Generators power grids

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Impedance Modeling of DFIG Wind Farms With Various Rotor Speeds and Frequency Coupling

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IEEE TRANSACTIONS ON CIRCUITS AND SYSTEMS II-EXPRESS BRIEFS 2021年第1期68卷 406-410页

作者： Liu, Bin Li, Zhen Wang, Haijiao Dong, Xiaoliang Su, Wuyang Li, Guanghui Chen, Xi Fernando, Tyrone Iu, Herbert H. C. Lian, Xiaoqin Liu, Xiangdong Beijing Inst Technol Sch Automat Beijing 100081 Peoples R China Beijing Inst Technol Key Lab Intelligent Control & Decis Complex Syst Beijing 100081 Peoples R China China Elect Power Res Inst Renewable Energy Res Ctr Beijing 100192 Peoples R China State Grid Corp China Natl Power Dispatching & Control Ctr Beijing 100053 Peoples R China State Grid Corp China North China Branch Beijing Peoples R China GEIRI North Amer Dev & Planning Dept San Jose CA 95134 USA Univ Western Australia Sch Elect Elect & Comp Engn Crawley WA 6009 Australia Beijing Technol & Business Univ Sch Comp & Informat Engn Beijing 100048 Peoples R China

The oscillation phenomenon frequently occurs in large-scale grid-connected doubly-fed induction generators (DFIG) wind farms and the impedance-based analysis has gradually become a widely used method to analyze the wind power oscillation issues. The rotor speed of each wind turbine (WT) is usually different as an important factor to determine the operating point and affect the output impedance. This brief develops a DFIG wind farm impedance model considering different rotor speeds. The impedance of each WT is firstly obtained according to various rotor speeds and all the WTs are aggregated considering the complex frequency coupling effects to describe the overall wind farm impedance. The comparison between the simplified aggregation method of wind farms and the proposed model is given to indicate that the proposed model can provide more accurate modeling and stability analysis results.

关键词： Wind farms Impedance Rotors Doubly fed induction generators Admittance Couplings Harmonic analysis Doubly fed induction generator (DFIG) wind farm impedance modeling stability analysis rotor speed

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A robust identification method for transmission line parameters based on BP neural network and modified SCADA data 4

A robust identification method for transmission line paramet...

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4th IEEE International Conference on Energy Internet, ICEI 2020

作者： Lu, Min Jin, Xueqi Wang, Xiaozhong Xu, Yan Wang, Yangyingfu Kong, He Gu, Lei Luo, Kaiyang Xue, Ancheng State Grid Zhejiang Electric Power Company Electric Power Dispatching Control Center Hangzhou China State Grid Zhejiang Electric Power Company Huzhou Power Supply Company Huzhou China North China Electric Power University State Key Laboratory of Alternate Electrical Power System with Renewable Energy Source Beijing China

ISBN: (纸本)9780738105000

Accurate transmission line (TL) parameters are the basis of power system calculations. In recent years, artificial intelligence (AI) develops rapidly, which has been applied widely in power systems. However, AI is rarely applied to TL parameter identification. Thus, combining the TL model and AI, this paper proposes a robust identification method for TL parameters combined with BP (back propagation) neural network and median robust estimation, with the modified SCADA measurements based on TL model. Specifically, first, the robust identification method for TL parameter combined with BP neutral network and median estimation is proposed. And then, the training set that considers various working conditions and different line parameters is constructed based on the π-equivalent model. Furthermore, the input data of BP neural network is construed by modifying the SCADA data based on TL model. In addition, the median estimation is used to obtain the final result, which could reduce the interference of noise. Finally, the results with simulated data and measured SCADA measurements data show the effectiveness and practicality of the proposed method, respectively. © 2020 IEEE.

关键词： Electric lines

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A Non-intrusive Appliances Load Monitoring Method Based on Hourly Smart Meter Data 9th

A Non-intrusive Appliances Load Monitoring Method Based on H...

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9th International Conference on Computer Engineering and Networks, CENet2019

作者： Song, Chunhe Wang, Zhongfeng Liu, Shuji Xu, Libo Zhou, Dapeng Zeng, Peng Key Laboratory of Networked Control Systems Shenyang Institute of Automation Chinese Academy of Sciences Shenyang110016 China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang110016 China State Grid Liaoning Electric Power Co. Ltd. Shenyang110000 China

ISBN: (纸本)9789811537523

Peak load management is very important for the electric power system. This paper analyzes the impact of residential swimming pool pumps (RSPPs) on the peak load. First, this paper analyzes the challenges of non-intrusive energy consumption estimation for SPPs. Second, a novel reference-based change-point (RCP) model is proposed for non-intrusive SPPs energy consumption estimation. The advantages of the proposed RCP model are that it does not require high sampling rate data or prior information of the appliance. We show that during pool season, under the assumption that the ratio of base loads (defined as the power consumption which is independent of the outdoor temperature) of houses with and with PPs remains the same during no-pool season and pool season, 6.3% of the total energy is consumed by PPs, while under the assumption that for houses with and without PPs, the ratio of base loads is equal to the ratio of the temperature-dependent power consumption during pool season, 9.08% of the total energy is consumed by PPs. Furthermore, we show that by shifting PPs activity period, under the first assumption, at least 1.27% of peak demand can be reduced, while under the second assumption, at least 4.53% of peak demand can be reduced. © 2021, Springer Nature Singapore Pte Ltd.

关键词： Electric power utilization

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Corrosion fault identification model of substation grounding grid based on PSO-LS-SVM 4

Corrosion fault identification model of substation grounding...

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4th International Conference on Mechanical, Electric and Industrial Engineering, MEIE 2021

作者： Qin, Jun Miao, Jin Wu, Xi Wang, Zibo Shao, Shuai State Grid Wuxi Power Supply Company Wuxi Jiangsu China Key Laboratory of Networked Control Systems Chinese Academy of Sciences Shenyang China Shenyang Institute of Automation Chinese Academy of Sciences Shenyang China Institutes for Robotics and Intelligent Manufacturing Chinese Academy of Sciences Shenyang China

As one of the important equipment to ensure the normal operation of substation, the performance of grounding grid has been highly concerned. In recent years, researchers propose that the theory of electromagnetic induction can be used to diagnose and identify the corrosion fault of substation grounding grid. In this paper, a fault classification model based on LS-SVM optimized by PSO is proposed to identify the corrosion fault of grounding grid. Firstly, the wavelet packet transform principle is used to filter the original data, and the wavelet packet energy is used to construct the fault eigenvalue as the input of the fault classification model. Based on LS-SVM, a corrosion fault classification model is constructed, and particle swarm optimization method is used to optimize the parameters of the model, which solves the problem of traditional SVM parameter optimization. Through the practical application in substation, the model proposed in this paper can identify the corrosion of grounding grid conductor without excavation and power failure, which provides an effective scheme for engineering application. © Published under licence by IOP Publishing Ltd.

关键词： Corrosion

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