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检索条件"任意字段=8th IEEE International Conference on Advanced Power System Automation and Protection, APAP 2019"

共 611 条记录，以下是61-70 订阅

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Analytical Analysis and protection Setting of Taveling Wave protection in Hybrid HVDC system 8

Analytical Analysis and Protection Setting of Taveling Wave ...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Cheng, Shaojie Zhang, Baohui Wang, Jiahao Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Xi'an China

ISBN: (纸本)9781728117225

the hybrid HVDC system, in which the rectifier is made up of LCC and the converter is composed of MMC, has quite different characteristics from the symmetrical LCC-HVDC systems. therefore, it is necessary to study the protection method for hybrid HVDC transmission lines. this paper develops a reduced analytical model of LCC-MMC-HVDC system for DC line fault transient analysis. the analytical models of internal and external fault are established in frequency domain and applicable to the first fault traveling wave. Analysis illustrates that it has high accuracy compared with the simulation result. Based on the reduced model, the analytical setting method of traveling wave protection is put forward, which considers the randomness of sampling. Furthermore, the performance of traveling wave protection is analyzed based on the analytical analysis, and the result shows that traveling wave protection performances well for the MMC side, but it has quite poor ability of resistance at LCC side of the transmission line. © 2019 ieee.

关键词： Analytical models

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Testing Cyber Security of power systems on a Real Time Digital Simulator 8

Testing Cyber Security of Power Systems on a Real Time Digit...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Devanarayana, Chamara Zhang, Yi Kuffel, Rick Rtds Technologies Inc WinnipegMBR3T 2E1 Canada

ISBN: (纸本)9781728117225

this paper introduces an architecture of a cybersecurity testbed for power systems using RTDS real time simulator and communication network simulators. the power network is modelled on the RTDS simulator, which provides the background of power grid infrastructure for cyber attack testing. the cyber information system is modelled on a network emulator named DeterLab and a network simulator named Network Simulator-3 (NS-3). the power system uses the cyber information system to transmit its control signals, which are potentially under the threat of cyber-attacks. Some common types of cyber-attacks, such as man-in-the-middle (MITM) and Denial of service (DoS) attacks, are demonstrated in the above testing environment. the distribution grid operator (DSO) uses the services of flexible assets to ensure that grid assets such as cables and transformers do not get overloaded. the paper shows the vulnerability of the power grid under cyberattacks and provides a testing facility for developing advanced countermeasures to prevent potential cyber-attacks. © 2019 ieee.

关键词： Smart power grids

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Prediction and Optimization on Energy Consumption of Data Center Based on Multi-layer Feedforward Neural Network 8

Prediction and Optimization on Energy Consumption of Data Ce...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Zhang, Song Ye, Xin Ren, Ying Northeast Electric Power Design Institute Co. Ltd. Intelligentization Branch Office Changchun China

ISBN: (纸本)9781728117225

there will be the characteristics of large amounts of equipments, high parameter coupling, non-linear calculation and complex modeling for the conventional energy consumption calculation. Multi-layer feedforward neural network model is used to establish relations between the parameters of air conditioning system, computer equipments, power supply system and the energy consumption values. the error back-propagation algorithm based on gradient descent strategy is used to adjust connection weight and threshold of the neurons in hidden layers. the genetic algorithm is used on the initial weights and thresholds optimization and the search for minimum energy consumption. through the prediction of energy consumption with the variation of uncontrollable parameters, the adjustment of controllable parameters such as the temperature target value of air conditioner, the control mode of fresh air exchangers and humidifiers can obtain the target of energy consumption minimization. © 2019 ieee.

关键词： Air conditioning

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Study on Suppression Measures for Voltage over-limit of Distribution Network with Small Hydropower Group 8

Study on Suppression Measures for Voltage over-limit of Dist...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Qunmin, Yan Ruiqing, Ma Juanjuan, Zhu Yujiao, Li Northwestern Polytechnical University School of Automation Xi'an China Shaanxi University of Technology School of Electrical Engineering Hanzhong China

ISBN: (纸本)9781728117225

Small hydropower groups connected to the distribution network and operated in reverse power state will cause voltage over-limit in the key nodes and some nodes of grid. through the analysis of the power system voltage regulation principle, four voltage regulation measures such as adjusting the generator voltage, changing the transformer ratio, performing reactive power compensation, and optimizing the conductor are obtained. Taking a regional distribution network as an example, based on the PSASP (power system Analysis Software Package) simulation software, a distribution network model with small hydropower groups was established, focusing on the distribution line voltage of the distribution network in the reverse power state during the summer flood season. the four voltage regulation measures were simulated under voltage over-limit, which effects of suppression methods were analyzed and compared. It has certain reference significance and engineering practical value for the voltage adjustment of hydropower access distribution network in the future. © 2019 ieee.

关键词： Reactive power

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Point Estimation Method Considering Estimator Boundary Constraints to Calculate Probabilistic power Flow 8

Point Estimation Method Considering Estimator Boundary Const...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Fang, Cheng Li, Jing Qin, Boyu Xi'an Jiaotong University School of Electrical Engineering Xi'an710049 China Jiangsu Nuclear Power Co Ltd Lianyungang222000 China

ISBN: (纸本)9781728117225

Point estimation method is commonly used to calculate probabilistic power flow due to its accuracy and efficiency. However, it may cause relatively large errors when dealing with some probabilistic models, such as wind farms which have cut-in and cut-out constraints. this paper proposes the idea of equal constraint transformation and power transformation to solve this problem. First, the mathematical model of electricity system is constructed. Second, the idea of power transformation is utilized to transform wind speed from asymmetry into symmetry to ensure that the estimated point locates within the limit. third, equal constraint transformation method is used to estimate the power generated by wind farms. Finally, time-domain simulations are performed to verify the effectiveness of the proposed two methods. © 2019 ieee.

关键词： Wind farm

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Non-intrusive Load Decomposition of Stacked Hybrid Recurrent Neural Networks 8

Non-intrusive Load Decomposition of Stacked Hybrid Recurrent...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Zhang, Zhiyu Fan, Chao Xi'an University of Technology School of Automation and Information Xi'an China

ISBN: (纸本)9781728117225

Non-intrusive Load Decomposition (NILD) is the process of extracting the power consumptions multiple appliances from the total consumption signal of the building. For the problems of weak time characteristic, high misjudgment rate and low accuracy of load decomposition of traditional algorithm for multi-state equipment, this paper, based on deep learning, proposes a stacked hybrid recurrent neural networks (SHRNNs) method to decompose power load. Firstly, the NILD model of SHRNNs is constructed by combining gated recurrent unit neurons, long short-term memory neurons and convolution unit neurons, which often used to solve the time series problem. then, based on the UK-DALE-2017 dataset, different input sequence lengths are set according to different electrical equipment, and the total load sequence is decomposed by using the built model. Finally, the validity of the model is verified by comparing with the traditional load decomposition algorithm. © 2019 ieee.

关键词： Recurrent neural networks

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Regional Marginal Price Mechanism in the China Northwest power Grid 8

Regional Marginal Price Mechanism in the China Northwest Pow...

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8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Ren, Yanzhery Liu, Shiyu Bie, Zhaohong Xi'an Jiaotong University State Key Laboratory of Electrical Insulation and Power Equipment Shaanxi Key Laboratory of Smart Grid Xi'an China

ISBN: (纸本)9781728117225

As a regional power grid with the highest penetration of renewable energy, the China Northwest power Grid is now facing with the renewable power curtailment. that is caused by the inefficient energy utilization, interest conflicts with thermal power generators and the immature electricity price mechanism. To address those problems, this paper proposes a regional marginal price (RMP) mechanism in the China Northwest power Grid. Firstly, the locational marginal price (LMP) in the Northwest China is calculated based on the economic dispatch theory. Secondly, on the premise of considering geographical location and renewable resource distribution, the Northwest China is divided into seven regions based on the clusters of LMP values. then, the RMPs in two typical days are calculated by PLEXOS, which verifies the effectiveness of RMP mechanism. Finally, the benefit of RMP mechanism in the China Northwest power Grid is shown by the comparison of three electricity price mechanisms. © 2019 ieee.

关键词： Energy utilization

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Research on Demand Forecast of power Grid Emergency Materials Based on CBR Method Improved by Information Update 8

Research on Demand Forecast of Power Grid Emergency Material...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Qingfa, Chai Wei, Cong Jian, Chen Shandong University Key Laboratory of Power System Intelligent Dispatch and Control Jinan China

ISBN: (纸本)9781728117225

the grid emergency caused by natural disasters has the characteristics of complexity, urgency, and information incompleteness, making it difficult to make emergency material dispatching. Based on the study of historical fault-meteorology-repair statistics of power grids, this paper proposes a CBR (case-based reasoning) method for the demand of emergency materials in power grids, combining intuitionistic fuzzy sets with case-based reasoning, considering meteorological elements, geological elements, and accidents. the characteristic factors are corrected with the information update, the iterative calculation of the prediction process is realized, and the material demand is accurately predicted. the example shows that this method can accurately predict the demand for emergency materials in grid emergencies. © 2019 ieee.

关键词： Iterative methods

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Influence of DC Current Flowing through the Ground Electrode on AC power Grid 8

Influence of DC Current Flowing through the Ground Electrode...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Gao, Bing Liu, Qing Li, Aidi Qiao, Jun Xi'an University of Science Technology College of Electrical and Control Engineering Xi'an China

ISBN: (纸本)9781728117225

Under the condition of the unipolar operation, the earthing current of DC ground electrode will cause distortion in earth surface potential (ESP), having adverse impacts on the surrounding environment and AC power grid. this paper uses the finite element method (FEM) to analyze ESP distribution, and the influence of currents and geoelectric parameters on the ESP distribution is taken into account. Taking Qilian converter station as an example, the DC equivalent model of Gansu grid is established to simulate the bias current in the power system around the ground electrode. Results show that the ESP distribution is greatly affected by the soil structure, and the bias level of transformers is related to the grid structure and the distance between stations and the ground electrode. the transformer with DC bias is mainly concentrated in regions close to the ground electrode, providing a reference for the treatment and prevention of bias current. © 2019 ieee.

关键词： Finite element method

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An Identification Method for Sympathetic Inrush Based on Substation-Area Information 8

An Identification Method for Sympathetic Inrush Based on Sub...

引用

8th ieee international conference on advanced power system automation and protection, apap 2019

作者： Peng, Fang Liu, Yiqing Cheng, Xingong University of Jinan School of Electrical Engineering Jinan China

ISBN: (纸本)9781728117225

Sympathetic inrush is a phenomenon that occurs in an in-service transformer (IT) when a nearby transformer is energized. the phenomenon can cause transformer differential protection to maloperate. Identification methods for sympathetic inrush have been proposed to deal with the problem. However, these methods are based on local information from the IT, while sympathetic inrush involves two or more transformers. therefore, an identification method is proposed based on substation-area information. A substation-area differential current is defined and its second harmonic component is utilized to identify the sympathetic inrush. Simulation results by PSCAD/EMTDC show the proposed method can distinguish sympathetic inrush from internal faults and energization inrush effectively. © 2019 ieee.

关键词： Transformer protection

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