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Electrical Insulation Conference and Electrical Manufacturing & Coil Winding Conference

作者： Jieqing Deng Chao Wei Jiansheng Li Houying Li Guangyao Wang Youyuan Wang State Grid Jiangsu Electric Power Nanjing China Jiangsu Electric Power Company Research Institute Nanjing China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing China

ISBN: (数字)9781538676240

ISBN: (纸本)9781538676257

At present, the maintenance strategy for transformers mainly focus on the optimization of maintenance mode and time, while the influence of state parameter detection mode on power grid is often ignored. Considering the popularization and application of live detection technology, an optimization method of transformer state maintenance strategy based on live detection is proposed, which considers the economy and reliability. Firstly, on the basis of defining the key detection parameters of power outage test, an alternative analysis model based on online oil chromatographic data is constructed for replacing power outage test parameters. And then the average value of absolute error is introduced as an evaluation index to determine whether to replace or extend the power outage test, which is called the formulation of optimal scheme. Finally, a quantitative model of acquisition risk of state parameters and transformer failure risk is established with the comprehensive optimization of reliability and economy as decision variables. The example of maintenance decision-making for a 220kV transformer shows that the state maintenance based on live detection can reduce the maintenance cost on the principle of ensuring safe and reliable operation of transformer.

关键词： power system reliability Maintenance engineering Optimization power transformer insulation Oil insulation Reliability

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High-frequency modeling of PMSM by the VF-PSO in electric vehicles

High-frequency modeling of PMSM by the VF-PSO in electric ve...

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Sustainable power and Energy Conference (iSPEC)

作者： Wenxin Peng Songnong Li Zhao Wu Huaiqing Zhang Lin Chen Hemeng Peng Chongqing Key Laboratory of Energy Internet Advanced Metrology and Measurement Technology State Grid Chongqing Electric Power Research Institute Chongqing China The State Key Laboratory of Transmission Equipment and System Safety and Electrical New Technology Chongqing China Chongqing Ceprei Industrial Technology Research Institute Chongqing China

This electronic document is a "live" template and already defines the components of your paper [title, text, heads, etc.] in its style sheet. *CRITICAL: Do Not Use Symbols, Special Characters, Footnotes, or Math in Paper Title or Abstra Permanent magnet synchronous motor (PMSM) has been widely applied in Electric vehicles. But PMSM is a main propagation path for CM and DM conducted emission of the drive system, many high-frequency harmonic components generated by dv/dt (di/dt) can be find in the motor terminals. In order to research the conducted EMI in the drive system, a PMSM modeling is proposed, the parameters of high frequency model of motor are extracted by VF method and optimized by PSO algorithm. The calculated results is compared with the experimental impedance measured on a 45 kW PMSM, which shows fairly high accuracy in the frequency range of 100 kHz-110 MHz.

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A Hierarchical Control Strategy for DC Distribution Networks with Multiple Voltage Classes 21

A Hierarchical Control Strategy for DC Distribution Networks...

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21st International Conference on Electrical Machines and Systems, ICEMS 2018

作者： Fang, Hui Luo, Yonaiie Zhao, Ke Chen, Tao Jiang, Wang Zhu, Xiaojun State Grid Chongqing Electric Power Company Electric Power Research Institute Chongqing China Chongqing University State Key Laboratory of Power Transmission Equipment System Security and New Technology Chongqing China

ISBN: (纸本)9788986510201

This paper focuses on the dc voltage control strategies of dc distribution networks consisting of several parallel connected voltage source converters (VSCs) with multiple dc voltage classes, which is highly attractive in renewable energy integration and urban power supply. Based on the mathematical model, a hierarchical control strategy including converter control, dc-link voltage control and system control is proposed to ensure high system reliability and high power quality in various operation conditions. The proposed method is validated by PSCAD/EMTDC simulation results. © 2018 KIEE EMECS (KIEE Electrical Machinery and Energy Conversion Systems).

关键词： Quality control

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Electrical Behavior against Current Impulse in ZnO Varistor Ceramics with SiO2 Addition

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Journal of Physics: Conference Series 2020年第1期1637卷

作者： Bowen Wang Zhen Fang Zhiyao Fu Yongjing Peng State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment State Grid Hunan Electric Power Company Disaster Prevention and Reduction Center Changsha410129 China. State Key Laboratory of Advanced Electromagnetic Engineering and Technology Huazhong University of Science and Technology Wuhan 430074 Hubei China

SiO2 addition effect on electrical behaviour against current impulse in the ZnO varistors was investigated. SiO2 acts as a controller in ZnO grain growth, decreasing the grain size of ZnO from 8.87 to 5.86 μm, which in turn results in an increase in breakdown voltage E1mA from 192.77 to 252.57 V/mm. SiO2 has a significant influence on the current energy withstand capability and impulse aging characteristics. The results indicated that the SiO2 content was optimized at 1.5 mol%, exhibiting the best energy withstand capability of 332.03J/cm3 and clamping ratio of 1.71.

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state evaluation method and correction of oil-immersed transformer in the renewable power grid based on big data analysis

State evaluation method and correction of oil-immersed trans...

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8th Renewable power Generation Conference (RPG 2019)

作者： Jian Guo Hongshun Liu Ali Abdo Xinghua Liu Peng Gao Kecun Han Xuebin Lv Chao Yang Tongping Xie Yang Yu Peng Sun Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment (School of Electrical Engineering of Shandong University) Jinan China State Grid Zibo Power Supply Company Zibo China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

The state evaluation of power equipment is an important basis for maintenance scheduling. This paper starts from the performance state data of power transformer and aims to study the matrix model and mathematical analysis method that is applicable to the state parameter system of power equipment in renewable power grid. Different from the traditional threshold deduction method, this paper is more inclined to propose a closed loop model by finding the correlation among the internal key parameters of the system by reducing the dimension of the state matrix and increasing the dimension of iterations. This paper presents the basic state evaluation parameter system from various aspects which are based on the multi-source information of renewable power grid substations. The dimensionality reduction of the matrix is carried out for the criterion matrix of the nature.

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Simulation Study on Lightning Protection of New 500 kV Lightning-proof Line Insulator

Simulation Study on Lightning Protection of New 500 kV Light...

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

作者： Qiang Huang Zhenglong Jiang Jie Deng Jiabin Zou School of Electrical & Information Engineering Changsha University of Science & Technology Changsha China State Key Laboratory of Disaster Prevention & Reduction for Power Grid Transmission and Distribution Equipment Changsha China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

Line arrester is an important lightning protection method for 500kV extra-high voltage (EHV) transmission lines. The current Zinc Oxide Arresters have shortcomings in performance, installation, in this paper, lightning-proof insulators with excellent lightning protection characteristics are adopted. The ATP-EMTP simulation is used to analyze the transmission line when it was subjected to the most serious conditions of counter-attack and lightning shielding failure, including energy releasing condition of the lightning-proof insulator, and the maximum withstanding lightning current after the lightning-proof insulator replaces the ordinary insulator. The simulation results show that the lightning protection insulator circuit can avoid the grounding fault of the transmission line, especially in the terrain where the grounding resistance is difficult to reduce; In the case of 800A 2ms square wave flow capacity is 1237kJ, the influence of lightning counterattack on the operation of the lightning protection type insulator is negligible with respect to the lightning shielding failure current and the maximum tolerated lightning shielding failure current amplitude of the 500kV line is -84kA ,which meets line lightning protection requirements.

关键词： Insulators Arresters power transmission lines Lightning protection Resistance Grounding

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Research on Simulation Characteristics of Cascaded Multilevel SVG

Research on Simulation Characteristics of Cascaded Multileve...

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

作者： Jiabin Zou Li Bo Xu Kai School of Electrical & Information Engineering Changsha University of Science & Technology Changsha China State Key Laboratory of Disaster Prevention and Reduction for Power Grid Transmission and Distribution Equipment Changsha China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

The current tracking control method is an important indicator of the effectiveness of static var generator (SVG) in compensating the ineffective effect. New current control methods are constantly proposed and improved. Deadbeat control has good steady-state performance, but its dynamic response is slow. Combining deadbeat control with PI control can effectively improve the accuracy of reactive power compensation and improve the dynamic response speed of the system. On this basis, simulation modeling and experimental research are carried out. The effectiveness and reliability of the proposed control strategy are verified on the simulation and experimental results.

关键词： Voltage control Reactive power Mathematical model Capacitors power system dynamics power system stability Current control

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A Multi-Objective Model with Probability Constraints of Trans-Provincial Dynamic Stability Limit

A Multi-Objective Model with Probability Constraints of Tran...

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2019年第五届机械工程及自动化科技国际会议

作者： Ke Yang Rui Mao Xu Wen Chuncheng Gao Miao Huang Wei Yan Southwest Subsection of State Grid State Key Laboratory of Power Transmission Equipment & System Security and New Technology(Chongqing University) College of Automation Chongqing University of Posts and Telecommunications Beijing Ke Dong Electric Power Control System Co. Ltd. Nari Group Corporation/State Grid Electric Power Research Institute

With the rapid development of clean energy and serious delay of grid construction, water abandonment is becoming more and more severe. Under this condition, this paper proposed a multi-objective model with probability constraints of trans-provincial hydropower consumption considering dynamic stability limit. Firstly, a mathematical expression about the dynamic stability limit of trans-provincial channel is constructed. Secondly, a risk assessment index of abandoned water is established on the basis of semi-absolute deviation. Then, based on the framework of stochastic programming, a multi-objective model with probability constraints is proposed for hydropower transmission in trans-provincial trade. By means of genetic algorithm with embedded Monte-Carlo simulation technology, the model can be solved efficiently. Finally, data of Tibet power grid is calculated to verify the validity and universality of the research. The results show that the established model can achieve optimal economic benefit between grid companies and generation enterprises, and also effective management of water abandonment risk.

关键词： A Multi-Objective Model with Probability Constraints of Trans-Provincial Dynamic Stability Limit Model

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A NOVEL METHOD IN CLASSIFYING AND ANALYSING FAULTS IN RENEWABLE ENERGY power TRANSFORMERS

A NOVEL METHOD IN CLASSIFYING AND ANALYSING FAULTS IN RENEWA...

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International Conference on Renewable power Generation

作者： Ali Abdo Hongru Zhang Hongshun Liu Jian Guo Xinghua Liu Peng Gao Kecun Han Xuebin Lv Chao Yang Tongping Xie Yang Yu Peng Sun Shandong Provincial Key Laboratory of UHV Transmission Technology and Equipment (School of Electrical Engineering of Shandong University) Jinan China State Grid Zibo Power Supply Company Zibo China

ISBN: (数字)9781839531248

ISBN: (纸本)9781839531255

Large scale renewable grids like PV (Photovoltaic) power plants use power transformers which are considered a major player in the field of renewable energy, it plays an important role in the system by stepping up the output voltage of the PV system inverter and supply it to the grid. Thus, it is pivotal to provide the necessary maintenance and diagnostic procedures to it. This paper explains a new and effective method for analysing and classifying faults in a power transformer. It starts by pre-processing the sampled data by using Z-score normalization method and putting the pre-processed results into Sigmoid function to eliminate noise, outliers and increase accuracy. Then the data is inputted to the neural networks Self-organizing map to obtain the number of clusters and the results are used as an input to the unsupervised clustering algorithm based fuzzy C-means method for classifying the faults. Validation of the proposed approach has been accomplished by examining sampled data via DGA (Dissolved Gas Analysis) technique which is obtained from Zibo electrical power company. By comparing the results of the proposed method and the traditional methods;it is found that the new method obtains a remarkable performance in classifying transformer faults.

关键词： state EVALUATION DISSOLVED GAS ANALYSIS (DGA) SELF-ORGANIZING MAP (SOM) MODIFIED FUZZY c-MEAN ALGORITHM (MFCM)

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A new method to extract stray inductance in IGBTs' Dynamic testing platform

A new method to extract stray inductance in IGBTs' Dynamic t...

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2018 International Conference on advanced Electronic Materials, Computers and Materials Engineering, AEMCME 2018

作者： Tang, Xinling Pan, Yan Zhang, Peng Zhao, Zhibin State Key Laboratory of Advanced Power Transmission Technology Global Energy Interconnection Research Institute of State Grid Corporation of China Beijing102209 China Dtate Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China

Stray inductance in IGBTs' dynamic testing platform has great influence on switching characteristics, such as switching speed, switching loss, voltage overshoot, and so on. Conventional methods are analyzed in this paper, which cannot extract stray inductance accurately due to existence of resistance in power stage current path. A new method is proposed in this paper to extract stray inductance based on turn-off transient waveform and a following turn-on transient waveform. In this method, it is assumed that capacitor voltage and load current are constants during turn-off transient and the following turn-on transient, and then the stray inductance is extracted accurately by using gradients of both turn-off current and turn-on current at a given current value. The new method eliminates the influence of resistance in current path. To verify the proposed method, circuit simulation is carried out by using Synopsys Saber;furthermore, an IGBT dynamic testing platform is developed, stray inductance of the testing platform is extracted under different voltage levels. Simulation and measurement results prove the effectiveness of the new method. Insulated gate bipolar transistors, electronic equipment testing, inductance measurement. © Published under licence by IOP Publishing Ltd.

关键词： power quality

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