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检索条件"机构=Stale Key Lab of Control and Simulation of Power Systems and Generation Equipments"

共 392 条记录，以下是41-50 订阅

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Research on the process of power flow transferring and its identification method

Research on the process of power flow transferring and its i...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Liu, Kun Dong, Xinzhou Wang, Bin Shi, Shenxing State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

This paper analyzes the general process of power flow transferring and divides it into four parts: 1) the process of first phase selection after fault occurs;2) the process of selective action at the first time;3) the process of second phase selection and status confirmation;4) the process after status confirmation. It points out that the issue of asymmetrical flow transferring is a critical process which must be put emphasis on. Then it proposes a method to identify this process, and discuss different solution methods. © 2011 IEEE.

关键词： Electric load flow

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A novel fault locator for power distribution system with neutral non-effectively grounded

A novel fault locator for power distribution system with neu...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Shi, Shenxing Dong, Xinzhou State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

Fault locator for power distribution system with neutral non-effectively grounded should locate phase-to-phase fault and single-phase-to-ground fault respectively. For phase-to-phase fault, the point can be located by power-frequency impedance. However, for single-phase-to-ground fault with limited power-frequency current not more than load current, a novel fault location technology should be developed. The paper will present a practical single-phase-to-ground fault location based on fault generated traveling waves acquired from one phase current transducer and zero sequence current transducer at first. Then implementation of the novel fault locator is proposed including hardware design and software flowchart. At last field tests will be made to verify the feasibility of the fault locator. © 2011 IEEE.

关键词： Transducers

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Adaptive Time Period Aggregation for Day-ahead Unit Commitment

Adaptive Time Period Aggregation for Day-ahead Unit Commitme...

引用

2022 Tsinghua-IET Electrical Engineering Academic Forum, TDF 2022

作者： Yu, Zekuan Zhong, Haiwang Yan, Xinfei Department of Electrical Engineering Tsinghua University Beijing China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Beijing China

ISBN: (数字)9781839537998

ISBN: (纸本)9781839537998

The growing penetration of renewables calls for finer temporal resolutions of the day-ahead unit commitment (DA-UC) problem in order to accommodate the fluctuations and improve the performance of UC schedules, leading to the expansion of the DA-UC problem scale. However, due to its high computational burden, the viability of adopting larger UC models in practice becomes a challenge. In this paper, an adaptive time period aggregation strategy and a corresponding DA-UC model are proposed to reduce the model scale while preserving feasibility and accuracy. The aggregation strategy integrates the statistical characteristics of net demand with the operational characteristics of thermal units to effectively capture the consistency in on/off statuses. Case study based on the IEEE 118-bus system validates that, combined with a post-processing procedure, the proposed strategy and model can provide near-optimal UC schedules with approximately 5 times acceleration for various demand profiles, enhancing computational efficiency. © 2022 IET Conference Proceedings. All rights reserved.

关键词： Computational efficiency

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Single phase grounding fault location based on frequency domain characteristics of fault current

Single phase grounding fault location based on frequency dom...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Jiang, Bo Shi, Shenxing Dong, Xinzhou Wang, Bin State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

This paper studies the fault current frequency spectrum characteristics of single phase ground fault in ungrounded distribution networks, and the fault location method based on it. Firstly, it analyzes the production mechanism of 2nd major frequency component, and the relationship between the 2nd major frequency component and series resonance frequency of the faulted line. Secondly, from the perspectives of lumped-parameter circuit, the relationship between 2nd major frequency component and fault location is deduced. simulation cases are used to confirm the relationship. Last, the impact of load and initial fault phase angle on the 2nd major frequency component are researched. simulation research proves the feasibility of the fault detection and location method based on frequency domain characteristics. © 2011 IEEE.

关键词： Electric fault location

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Estimating the electromechanical oscillation characteristics of power system based on measured ambient data utilizing stochastic subspace method

Estimating the electromechanical oscillation characteristics...

引用

2011 IEEE PES General Meeting: The Electrification of Transportation and the Grid of the Future

作者： Jingmin, Ni Chen, Shen Feng, Liu State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781457710018

Estimating low-frequency oscillation modes and the corresponding mode shapes based on ambient data from WAMS measurements has a promising prospect of application in power system analysis and control. The present approaches estimate the modes and mode shapes respectively, which greatly reduce the computational efficiency. Besides, there is no good solution for the problem of discriminating real modes from the spurious ones caused by numerical error. A method based on stochastic subspace method was proposed in this paper. By choosing the angle measurements of all buses as input signals for the method, the modes and simultaneously the corresponding mode shapes of any bus can be estimated conveniently. By introducing the idea of reference channels, the computation complexity was substantially reduced without decreasing the accuracy. Stabilization diagrams technique was introduced to discriminate the real modes from the spurious ones. The test case based on the IEEE-118 system indicated that the method proposed is satisfying in respect of both computational efficiency and accuracy of results. © 2011 IEEE.

关键词： Computational efficiency

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Applicable range analysis of optimized single-terminal fault location algorithm

Applicable range analysis of optimized single-terminal fault...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Huang, Tian-Xiao Dong, Xin-Zhou Shi, Shen-Xing Wang, Bin State Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

Impedance method and single terminal travelling wave method are analyzed in paper, applicable scope of optimized solution is presented. Impedance method is of high robustness but low accuracy. Single terminal travelling wave method offers high accuracy but poor robustness. Optimized solution combines these two methods together, takes advantages of both methods. It is a great enhancement to single terminal fault location. This paper analyzed theoretical basis of optimized solution, proposed the calculation algorithm of fault location range using impedance method. Analyses of impedance method and single terminal travelling wave method show that the optimized solution is suitable for engineering application. Error analysis is proved correct by simulation. © 2011 IEEE.

关键词： Location

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Research on system protection with local information to prevent power grid blackouts

Research on system protection with local information to prev...

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Wang, Bin Dong, Xinzhou Liu, Kun Cao, Runbin Status Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

Aimed at power system large-scale blackouts, the paper firstly analyzes the existing problems of current protective relaying and emergency control in power grid. A novel system protection based on local information, protecting both the equipment and power system secure is then proposed, which scheme consists of: identification of fault flow transferring identification, adaptive overload protection and active load shedding strategy. The processes and system structure are introduced, and the following research points are also discussed in this paper. © 2011 IEEE.

关键词： Electric load shedding

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Discussion of protection and cascading outages from the viewpoint of communication

Discussion of protection and cascading outages from the view...

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2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Cao, RunBin Dong, Xinzhou Wang, Bin Liu, Kun Status Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

power grid and communication network, which depends on each other to provide proper functionality, are becoming more and more coupled together. Failure of a fraction of nodes in communication networks may lead to a failure even a cascade of failures in power grid. Wide area protection is highly dependent on communication. The failure of communication in some part of wide area protection system will affect the realization of the function to prevent cascading outages and result in serious consequences. Based on Manchester, OPA and hidden failure cascading failure models and considered the feature of relay protection, an improved cascading failure model is established. Then it is used to analyze the dynamic process of communication fails in wide area protection system and IEEE 30 bus system is employed to demonstrate the efficiency of the proposed method. Results show that communication failure in protection system will accelerate the cascading outages of power grid. Effective solutions to reduce the communication risk are discussed. The work of this paper is available for reference to analyze the process of cascading outages and design protection system preventing cascading outages. © 2011 IEEE.

关键词： Outages

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Study on travelling-wave protection starting element

Study on travelling-wave protection starting element

引用

2011 International Conference on Advanced power System Automation and Protection, APAP 2011

作者： Ren, Li Shi, ShenXing Wang, ShiYong Luo, ShuXin Dong XingZhou Status Key Lab. of Control and Simulation of Power Systems and Generation Equipments Dept. of Electrical Engineering Tsinghua University Haidian District Beijing 100084 China

ISBN: (纸本)9781424496198

Travelling-wave starting element is an integral part of the ultra high-speed protection. Existing design method depends on engineering experience, low accuracy in travelling-wave signal recognition, easy to trip frequently or refuse to trip. To solve these problems, through mass of starting signal simulation and analysis under different fault conditions, this paper focuses on the travelling-wave starting element and figures out the travelling-wave identification method. This paper summarizes the frequency and voltage characteristics of travelling-wave head, puts forward a new method in real-time travelling-wave fault identification. In addition, the analysis course included in this paper is a useful attempt that can be used in similar fault travelling-wave analysis. © 2011 IEEE.

关键词： Cutoff frequency

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Commutation Failure Mitigation Method Based on Improved Commutation Area in HVDC system 8

Commutation Failure Mitigation Method Based on Improved Comm...

引用

8th IEEE International Conference on Advanced power System Automation and Protection, APAP 2019

作者： Wang, Haozong Dong, Xinzhou Tsinghua University State Key Lab of Control and Simulation of Power Systems and Generation Equipment Beijing China

ISBN: (纸本)9781728117225

Commutation failure (CF) is one of the major concerns in high-voltage direct current (HVDC) transmission system. Of many methods to mitigate CF, advancing firing angle is preferred one since it can be easily implemented in current HVDC controllers without extra hardware modification. However, methods in previous works either lack for quantitative analysis or based on much strong hypothesis. In this paper, we propose a novel CF mitigation method based on improved commutation area. The salient feature of proposed strategy is that DC current is not considered as a constant under fault conditions. simulations on PSCAD/EMTDC software demonstrate the good performance of proposed method. © 2019 IEEE.

关键词： Electric commutation

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