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Fault Diagnosis of UHVDC Transmission system Based on Gated Recurrent Unit

Fault Diagnosis of UHVDC Transmission System Based on Gated ...

引用

2023 Panda Forum on power and Energy, PandaFPE 2023

作者： Ren, Yiming Yuan, Shuai Cheng, Gong Zhao, Qingsheng Wang, Lei Liang, Dingkang Yuan, Minhong Taiyuan University of Technology Shanxi Key Laboratory of Power System Operation and Control Taiyuan China State Grid UHV Transmission CO.OF SEPC State Grid Power Supply Company Taiyuan China State Grid Power Supply Company Taiyuan China

ISBN: (纸本)9798350321173

The traditional method for detecting and classifying different types of faults in Ultra High Voltage Direct Current (UHVDC) has low accuracy rate and does not sufficiently exploit the information of timing characteristics in the electrical quantity signals, making it difficult to identify some system faults and measurement faults. This paper presents a fault diagnosis strategy which is based on Gated Recurrent Unit (GRU) to overcome these shortcomings. The study investigates three key GRU training factors, namely the amount of network layers, learning rate, and batch size, which may affect the training effect of GRU. And several sets of experiments are designed to determine the most suitable GRU network parameters. The classification effect of GRU is compared with that of RNN and LSTM, and the experimental results illustrate the high diagnostic accuracy of this approach. In addition, the method does not need to transform the data and can use the initial 1D time-series data as the network input, avoiding the loss of valid information and reducing the complexity of the fault diagnosis process. © 2023 IEEE.

关键词： Failure analysis

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Reliability Assessment of Wind Farm with Wind Turbine Gearbox Fatigue 5

Reliability Assessment of Wind Farm with Wind Turbine Gearbo...

引用

5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Wang, Jiali Han, Xiaoqing Song, Tianhao Jia, Yanbing Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

The gearbox of wind turbine has the longest downtime due to mechanical failure, and fatigue is the most important failure form of gearbox. Traditional wind reliability model not considering the influence of gear box of immobilized fatigue, this paper proposes a meter and gearbox fatigue reliability evaluation method of wind farms, this method is intuitive reflect the extent to which each gearbox fatigue damage caused by different failure rate difference, and applicable to other fatigue as the main failure forms of component reliability modeling. The fatigue failure rate model of wind turbine gearbox was established based on the fatigue analysis of wind turbine gearbox, and the fatigue failure state was embedded into the conventional wind turbine Markov model through the failure rate, which was applied to the reliability evaluation of containing wind farm to improve the evaluation accuracy. The results show that ignoring the gearbox fatigue failure will lead to the wind turbine outage risk assessment results are relatively conservative, overestimate the reliability level of wind farm, and the more serious the accumulation of gearbox fatigue damage, the more significant the impact on the system reliability. © 2021 IEEE

关键词： Weibull distribution

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A control Strategy for T-Type Three-Level Converter to Suppress Midpoint Voltage Fluctuation 5

A Control Strategy for T-Type Three-Level Converter to Suppr...

引用

5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Hao, Guanfei Ren, Chunguang Zhang, Baifu Kong, Jiansheng Guo, Dongxin Han, Xiaoqing Shanxi Key Lab. of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

T-type three-level converter is widely used in high-current and low- voltage fields owing to its small number of power devices, low on state loss and high power density. Midpoint potential balance control of T-type converter is one of its key technologies. The neutral point potential imbalance increases harmonic distortion rate of output voltage and current, and reduce service life of DC side capacitor. This paper proposes midpoint potential balance control strategy in view of PIR-controlled zero-sequence voltage to control offset and fluctuation of midpoint potential. Functional model between midpoint current, reactive current and active current and the functional link between SPWM and SVPWM are established. The control strategy is simple in calculation and fast in dynamic response. It can realize midpoint potential balance domination under different power factors and the suppression of low-frequency voltage pulsation. Ultimately, simulations verify the effectiveness and correctness of proposed domination tactics. © 2021 IEEE

关键词： power converters

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Multi-Physical Field Coupled Method for Temperature Rise of Winding in Oil-immersed power Transformer

Multi-Physical Field Coupled Method for Temperature Rise of ...

引用

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

作者： Ruikang Dong Zhewen Niu Yuxiang Wu Songyan Lan Zhifang Dang Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

power transformer failures often result from elevated hot spot temperatures, which disrupt the regular operation of power systems. To precisely determine the hot spot temperature of transformer windings, this paper employs a 110kV oil-immersed power transformer as a case to develop a three-dimensional electromagnetic-temperature-fluid multi-physics coupling simulation model for the transformer. The core and winding loss density distribution is obtained through magnetic field calculations. On this basis, the loss density serves as the heat source, and temperature and flow field simulations for the transformer are conducted using thermal-fluid coupling. In addressing the issue of temperature discontinuity at the interface of fluid and solid coupled heat transfer, an adaptive grid refinement method is adopted to enhance grid resolution at the interface while employing a coarser grid in flatter regions, thus enhancing the precision of numerical simulations. Finally, the simulation results are compared with hot spot temperature calculations obtained through empirical formulas, confirming the method's feasibility.

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Distributed and Coordinated operation of Interconnected Electric Heating system Based on Multi-agent P2P Transaction

Distributed and Coordinated Operation of Interconnected Elec...

引用

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

作者： Shan Zhang Xiaoqing Han Tingjun Li Zehua Yin Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

Aiming at the problems that the traditional centralized operation mode cannot meet the demands of individual interests in the interconnected electric heating system, and the randomness and volatility of new energy bring uncertainty to the operation of the interconnected electric heating system, a distributed and coordinated operation mechanism of the interconnected electric heating system based on multi-agent P2P transactions is proposed. Firstly, in order to deal with the uncertainty of new energy, a robust day-ahead scheduling model considering unexpected constraints is established in the day-ahead stage. In the real-time stage, a real-time scheduling model based on P2P transactions is proposed, and distributed algorithms are adopted to solve the proposed model. Finally, an interconnected system composed of 3 electric heating systems is used for testing and analysis. The results show that the proposed operation model based on P2P transaction can reduce the total operation cost of the interconnected electric heating system.

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Optimal Dispatch of Coordinated Source-Grid-Load-Storage in New power system Based on Low-Carbon Demand Response

Optimal Dispatch of Coordinated Source-Grid-Load-Storage in ...

引用

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

作者： Yizhulin Li Xiaoqing Han Tingjun Li Rui Zhao Boyang Yan Shanxi Key Laboratory of Power System Operation and Control Tiyuan University of Technology Tiyuan China

In the context of China's “double carbon” goal, energy saving and emission reduction has become one of the primary strategic objectives of the current power industry. Aiming at the carbon measurement and low-carbon regulation operation of the new power system, a low-carbon demand response scheduling strategy based on carbon emission flow is proposed. First, we analyze the carbon emission influencing factors of each link of source-network -load-storage of the new power system. Firstly, we analyze the carbon emission influencing factors of each link of source-network -load-storage of the new power system, and establish an accurate carbon measurement model based on the carbon emission flow theory. carbon emission factor is used as a guiding signal to establish a low-carbon demand response mechanism for optimised dispatch. Finally, the proposed strategy is verified through examples to stimulate the carbon emission flow theory. Finally, the proposed strategy is verified through examples to stimulate the emission reduction potential of each link in the system, reduce carbon emissions and improve the rate of new energy consumption.

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A Multi-Stage Resilient Optimization Method for Coupled Electric-Gas system Based on Island Division

A Multi-Stage Resilient Optimization Method for Coupled Elec...

引用

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

作者： Hua Bai Xiaoqing Han Tingjun Li Jianan Du Yizhulin Li Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

The growing adoption of natural gas in power systems has led to a heightened focus on the resilience of coupled electric-gas system when confronted with large-scale faults during extreme disturbances. In this study, we examine the sequential recovery procedure of a coupled electric-gas system after experiencing severe faults. We propose an optimization method to enhance the resilience of the coupled electric-gas system. This approach integrates remote switching and isolated island to attain swift fault isolation and restoration. The primary goal is to enhance the system's resilience to extreme incidents and expedite its recovery. Firstly, a model for a coupled electric-gas system is developed to represent the power system, natural gas system, and energy conversion center. Subsequently, detailed models are created for the load shedding phase, fault isolation phase, and service recovery phase that occur in the coupled electric-gas system following extreme faults. These models encompass the topological constraints, power constraints. To illustrate the strategy for improving the resilience of the coupled electric-gas system, we employ practical examples involving the IEEE 33-node power system and a 7-node natural gas system. The simulation results indicate that this strategy effectively improves system resilience.

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Mechanism of the Influence of Inertia control Scale Factor of Doubly-Fed Induction Generator on system power Angle Stability 5

Mechanism of the Influence of Inertia Control Scale Factor o...

引用

5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Wang, Ke Qin, Wenping Zhang, Yu Zhu, Zhilong Xue, Shaokai Jing, Xiang Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

At present, China is the only country among the world's major economies where carbon emissions continue to grow, and the construction of a new power system with new energy sources as the mainstay is an important path to achieve carbon neutral. With the large scale of doubly-fed induction generators access to the grid, the stability characteristics of system power angle become more complex. On the background of DFIG access to a two-area interconnected system, a model is firstly designed for the system according to the area center of inertia theory and the influence of DFIG virtual inertia on the rotor motion equations of synchronous machines in two regions is analyzed. Secondly, the influence of the inertia control scale factor of DFIG on system power angle velocity during system acceleration and deceleration phase is studied when a three-phase short circuit fault occurs and then the mechanism analysis of the first swing stability of system power angle is investigated. Finally, the system power angle stability is evaluated by the maximum deviation of system power angle and a two-area interconnected system is modeled in PSASP to verify the proposed theory. © 2021 IEEE

关键词： Asynchronous generators

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DFIG Multi-time Scale control Characteristics and Simplified Modeling 5

DFIG Multi-time Scale Control Characteristics and Simplified...

引用

5th IEEE Conference on Energy Internet and Energy system Integration, EI2 2021

作者： Zhang, Yu Qin, Wenping Wang, Ke Xue, Shaokai Zhu, Zhilong Shanxi Key Laboratory of Power System Operation and Control Taiyuan University of Technology Taiyuan China

ISBN: (纸本)9781665434256

With the transformation and upgrading of energy structure, the proportion of doubly fed induction generator (DFIG) installed capacity in the power system will continue to increase and will have an important impact on system stability. For this reason, studying the multi-time scale control characteristics of DFIG and establishing a simplified model of DFIG are of great significance to the stability analysis of the power system. This article will start from the perspective of parameter trajectory sensitivity, and propose a multistage analysis method. Under different simulation events, the time scale is divided according to the response speed of DFIG control, and the characteristics of DFIG multi-time scale control are studied. On this basis, the detailed model of DFIG is simplified. Finally, the correctness of the research and the accuracy of the model built in this paper are verified by simulation comparison. © 2021 IEEE

关键词： Asynchronous generators

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Research on the Evaluation of Dispersed Photovoltaics Hosting Capacity Utilizing Measured Data

Research on the Evaluation of Dispersed Photovoltaics Hostin...

引用

IEEE General Meeting power& Energy Society

作者： Ruipeng Lu Wenping Qin Zhilong Zhu Penghui Qin Xiaoqing Han Peng Wang Shanxi Key Laboratory of Power System Operation and Control Key Laboratory of Cleaner Intelligent Control on Coal & Electricity Ministry of Education College of Electrical and Power Engineering Taiyuan University of Technology Taiyuan China

ISBN: (数字)9798350381832

ISBN: (纸本)9798350381849

To precisely evaluate the power system’s dispersed photovoltaics(PVs) hosting capacity, a method for assessing the maximum accessible capacity of distributed PVs using measured data has been suggested. Firstly, we extract the distributed PVs and bus power curves from the measured data and establish both distributed steady-state grid-following and grid-forming PVs power models. The shapelet method is employed to correct flawed daily load data. The simulated plant growth algorithm is integrated with the K-means clustering algorithm to identify time periods with similar load characteristics. The load decomposition method is utilised to reduce load time-series data into four load categories exhibiting typical industrial, commercial, agricultural, and domestic load characteristics. An enhanced ZIP load model is developed to examine the causes of load changes from a physical perspective. Furthermore, Using the improved dichotomy method, we rapidly analyse the hosting capacity of distributed PVs while adhering to operational safety constraints. We also compare the effects of two PVs types, namely grid-following PVs and grid-forming PVs, on system stability characteristics and hosting capacity. To culminate our study, we verify the simulation through application on an actual 10kV power distribution network.

关键词： Photovoltaic systems power measurement Grid following Distributed databases Clustering algorithms power system stability Data models Steady-state Load modeling Grid forming

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