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Fault causes identification for transmission lines based on HHT and PNN

Journal of Physics: Conference Series 2019年第2期1187卷

作者： Wen Du Renfei Che Hao Zhang Xiaocheng Meng Juntao He Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan State Grid Jiangsu Electric Power Company Technician Training Center Suzhou Zhengzhou Power Supply Company Zhengzhou 250061 China 215004 China 450006 China

In this paper, Hilbert-Huang transform(HHT) is introduced into the application of fault cause identification for transmission lines. This method is composed of empirical mode decomposition (EMD) and Hilbert transform. It can analyze the characteristics of signal frequency quantitatively and accurately[1]. By analyzing the information of four common faults from fault recorder, the Hilbert marginal spectrum and the Hilbert time-frequency spectrum can be considered as the feature of different fault causes which can be classified by a probability neural network (PNN). The results show that the method can effectively identify the cause of the fault and has a high accuracy.

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Fault location in active distribution network based on the change of current phase

Fault location in active distribution network based on the c...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Zhang, Chen Liu, Zhong Huang, Jun Wang, Bo Wang, Xiangnv State Grid Yangzhou Power Supply Company Weiyang Road 179 Yangzhou China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University 17923 Jinshi Road Jinan China

ISBN: (纸本)9781538614273

The growing penetration of the distributed generation (DG) makes the traditional passive distribution network change to active distribution network. A new fault location method is proposed in this paper based on the change of the current phase, which can be used in active distribution network. Specifically, a fault model of the invert DG is proposed, then the active distribution network model is established. The current phase difference between the two ends of the distribution line are calculated for both the normal operation and fault conditions. The relationship between the current phase and the location of the fault is summarized. A fault location criterion is proposed based on the change of the current phase difference. The correctness and effectiveness of the proposed method is verified using the practically measured data and the fault simulation. © 2017 IEEE.

关键词： Location

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Research on the Protection Range of Bird Droppings of 110kV Transmission Line Based on ANSYS Maxwell

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Journal of Physics: Conference Series 2019年第2期1187卷

作者： Hao Zhang Renfei Che Wen Du Xiaocheng Meng Juntao He Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan State Grid Jiangsu Electric Power Company Technician Training Center Suzhou Zhengzhou Power Supply Company Zhengzhou 250061 China 215004 China 450006 China

The falling of bird droppings near the insulator of overhead transmission lines will cause distortion of the electric field distribution near the insulator, resulting in air gap breakdown and flashover. Studying the area where there may be a risk of breakdown near the insulators in such a situation is of great significance for bird damage prevention of overhead transmission lines. Based on the finite element method, this paper established the 110kV transmission line model using ANSYS Maxwell finite element software and calculated the variation of the electric field distribution around the insulator when the bird droppings fall. Using the air gap average breakdown electric field strength as the criterion to judge whether breakdown occurs or not, the risk area of the air gap breakdown is determined, thereby determining the protection range of the transmission line for the flashover caused by the falling of bird droppings.

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Framework and applications of WAMS light communication system

Framework and applications of WAMS light communication syste...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Cao, Benqing Ochani, Manesh Kumar Zhang, Hengxu Xie, Wei Liu, Jinsong Bao, Hailong Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University Jinan250061 China State Grid Shanghai Municipal Electric Power Company Shanghai200437 China Electric Power Research Institute State Grid Shanghai Municipal Electric Power Company Shanghai200437 China

ISBN: (纸本)9781538614273

The dynamic response of distribution network is becoming more and more complicated, as the rapid development of renewable energy. Wide Area Measurement System light (WAMS Light) can monitor the distribution network synchronously. The communication of real-time and high-speed data has been put on the research agenda. Firstly, analyzes the existing communication network of distribution network, and proposes to use Long Term Evolution (LTE, 4G) for WAMS Light. Secondly, discusses the IEC 60870-5-101 and the IEEE C37.118.2 protocol, and puts forward suggestions for the WAMS Light protocol. Thirdly, studies the communication security, and suggests using DES and RSA algorithm based on key Distribution Center (KDC) in WAMS Light. Finally, the main station has received the PMU Light data smoothly through a platform containing PMUs Light and simulated PMUs Light. This means 4G, WAMS Light communication protocol, DES and RSA based KDC can be used in the communication of WAMS Light. © 2017 IEEE.

关键词： Phasor measurement units

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Wind and Storage Cooperative Scheduling Strategy Based on Deep Reinforcement Learning Algorithm

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Journal of Physics: Conference Series 2019年第3期1213卷

作者： Jingtao Qin Xueshan Han Guojing Liu Shang Wang Wenbo Li Zhe Jiang Key Laboratory of Power System Intelligent Dispatch and control of Ministry of Education (Shandong university) Jinan 250061 Shandong Province China +*** Key Laboratory of Power System Intelligent Dispatch and control of Ministry of Education (Shandong university) Jinan 250061 Shandong Province China State Grid Jiangsu Electric Power Company Economic Research Institute Nanjing 210008 Jiangsu Province China Tianjin Chengdong Power Supply Company Hedong District Tianjin 300250 China State Grid Shandong Electric Power Research Institute Jinan 250003 Shandong Province China

Wind energy has become one of the most promising new energy sources in the context of the global energy interconnection. However, the inherent uncertainty of wind power and the volatility of its output make it difficult to join the internet for scheduling. The uncertainty of the output must be reduced or even eliminated by certain methods. In this paper, wind power and energy storage are coordinated to eliminate the uncertainty of wind power output, and to reduce the burden on the grid while ensuring the long-term operation of wind farms. This paper first introduces Q-learning in reinforcement learning as a controller. Through a large number of historical wind power data training, the controller has good decision-making ability, so as to reduce the punishment caused by wind power uncertainty; then the Q-learning is improved aiming at the maximum average income of the stage. Finally, the Q-value network is established with conventional Q-learning and improved Q-learning. The DQN algorithm in the deep reinforcement learning algorithm is introduced for deep training and decision-making and the three algorithms are verified. The result proves that the deep reinforcement learning algorithm can achieve better control effect than Q-learning.

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The Development and Analysis of Primary Frequency Regulation and AGC Test in Shandong power grid

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IOP Conference Series: Earth and Environmental Science 2019年第4期295卷

作者： Qingbin Yu Gang Xin Yongji Cao Yuanyuan Li Qing Yan State Grid Shandong Electric Power Research Institute Jinan Shan Dong 250002 China Shandong Electric Power Dispatch Control Centre Jinan Shan Dong 250002 China Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education In Shandong University Jinan Shan Dong 250061 China

Based on the 2018 entire-gird primary frequency regulation and AGC test, the concrete procedures and obtained results of Shandong power grid are analyzed at length. In combination with the published standards and specifications, the new techniques adopted in the test are analyzed. And then, according to the emerging problems during the test, the improvement measures and optimization suggestions are proposed. With the help of analyzed results and proposed advices, the further technical supervision work of source-network coordination can be developed and thermal unit performance can be improved.

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Unit commitment considering demand response behavior based on utility maximization

Unit commitment considering demand response behavior based o...

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2017 IEEE Conference on Energy Internet and Energy System Integration, EI2 2017

作者： Zhang, Yumin Han, Xueshan Xu, Bo Zhang, Li Sun, Donglei Miao, Xiaofeng Jiang, Jiayin Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipment Department of Electrical Engineering Tsinghua University Haidian District Beijing100084 China Economic and Technology Research Institute of State Grid Shandong Electric Power Company Jinan China State Grid Shandong Electric Power Company Yantai Electric Power Company Yantai264001 China

ISBN: (纸本)9781538614273

The active participation of demand side resources in power grid operation not only benefits the individual participant but also benefits the whole system. The optimal goal can promote by excavating the active behaviors of demand side. The welfare maximization of market participant is the driving force of such active behaviors. Considering the independence of each user's behavior, the consumer's utility function is selected to depict consumer's preference and demand response behavior. In order to coordinate the consumers' maximum welfare with social welfare maximization, consumers' utility function and units' operation cost are integrated into Unit Commitment (UC) model. The objective function is to maximize social welfare, by subtracting units' operation cost from consumers' total utility, and this objective can be acquired. Considering the proposed model should be solved in a distributed manner, the idea of the centralized coordination and the decentralized decision-making is proposed. Based on the Lagrangian relaxation (LR) principle and distributed real-time pricing scheme, a closed-loop feedback mechanism is constructed to reflect the relationship among generator output, price level, and load demand. The ten generating units example can illustrate the effectiveness of the proposed method. © 2017 IEEE.

关键词： power markets

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A Two-level Voltage Stability Monitoring Method Based on P-V Sensitivity Assessment

A Two-level Voltage Stability Monitoring Method Based on P-V...

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IEEE power and Energy Society General Meeting

作者： Junlei Liu Huaichang Ge Yinguo Yang Qinglai Guo Feng Qian Hongbin Sun Mingye Zhang Bin Wang Guangdong Power Grid Power Dispatching Control Center State Key Laboratory of Power Systems Department of Electrical Engineering Tsinghua University

ISBN: (纸本)9781538622131;9781538622124

In this paper, the authors will introduce a two-level voltage stability evaluation method consists of control center level and substation level. At control center level, some certain sensitivities related with operation state of overall system are calculated and these variables are sent to several substations. At substation level, the proposed method adopts a different system model rather than Thevenin Equivalent Circuit, such that the results of local voltage stability assessment are more accurate than traditional distributed methods. The performance of the proposed method is tested on IEEE 39-bus system.

关键词： power system stability Substations Stability analysis Circuit stability power transmission lines Monitoring Integrated circuit modeling

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Modeling and simulation of DC micro-grid based on virtual motor control

Modeling and simulation of DC micro-grid based on virtual mo...

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2017 IEEE Transportation Electrification Conference and Expo, Asia-Pacific, ITEC Asia-Pacific 2017

作者： Yi, Wei Yi, Dawei Hu, Xiongwei Wang, Xiangnv Shi, Fang Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China National Joint Engineering Laboratory of Power Grid with Electric Vehicles 17923 Jingshi Road Jinan China State Grid Heilongjiang Power Corporation Harbin Electricity Power Supply Company 188 Shangzhi Road Harbin China

ISBN: (纸本)9781538628942

A flexible DC micro-grid model is proposed, which is suitable for grid-connected renewable energy and energy storage. The complete circuit topology and its corresponding control strategy are given, which can make sure energy reliability, and can automatically achieve a reasonable power distribution. In addition, based on the theory of Virtual Generator (VG), a complete control strategy of each interface is proposed, that is, the Virtual DC Generator (VDG) control strategy is adopted in the load and energy storage unit, and the Virtual Synchronous Generator (VSG) control strategy is adopted in the grid connection interface. VSG has the similar active and reactive power adjustment ability to the synchronous generator. The voltage amplitude and frequency of the grid- connected inverter are adjustable. It can simulate the inertia and damping characteristics of the synchronous generator, and overcome the impact of the traditional grid-connected inverter without inertia to the grid, which can effectively enhance the ability of the grid to accept renewable energy. What's more, the model of electric vehicles is considered into the micro-grid to meet the future trend of power grid. Simulation and experimental results verify the validity and reliability of the proposed. © 2017 IEEE.

关键词： DC-DC converters

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Stator current vector control strategy of doubly fed induction generator using proportional-resonant regulators

Stator current vector control strategy of doubly fed inducti...

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6th International Conference on Renewable power Generation

作者： Li, Qing Cheng, Peng Hao, Xiangjun Zhang, Jinping State Key Laboratory of Operation and Control of Renewable Energy and Storage Systems China Electric Power Research Institute Beijing100192 China Co. Ltd Beijing100192 China State Grid Shanxi Electric Power Dispatching and Control Center Taiyuan030001 China

This study proposes the stator current vector control (VC) strategy of the doubly fed induction generator. It is implemented in the stator stationary reference frame without the phase-lock loop. As a result, the phase-locked loop is removed with a simplified structure. Then, in the stator stationary reference frame, the commanded stator current values are calculated on the basis of the instantaneous power theory. By this means, the calculations of the stator current references are irrelevant to the generator parameters. It can greatly reduce the parameter dependency of the control system. Since the currents, the voltages, and the flux linkages are ac signals, the control system would operate on the ac quantities. Then, for zero steady errors, proportional-resonant controllers, tuned at the nominal frequency, are employed to regulate the stator currents to track their commanded values. Finally, the simulation results are presented to validate the effectiveness of the proposed stator current VC strategy. © 2017 Institution of Engineering and Technology. All rights reserved.

关键词： Stators

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