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The Effective Enhancement of power system security by Flexible Transmission Line Impedance with Minimal Rescheduling of Generators

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Circuits and systems 2016年第4期7卷 381-389页

作者： Karuppasamy Muthulakshmi R.M. Sasiraja Selvarajan Mukesh Muthu Department of Electrical and Electronics Engineering Kamaraj College of Engineering and Technology Virudhunagar Tamilnadu India Department of Electrical and Electronics Engineering Anna University Regional Campus Madurai Madurai Tamilnadu India

After the digital revolution, the power system security becomes an important issue and it urges the power producers to maintain a well secured system in order to supply a quality power to the end users. This paper presents an integrated Corrective security Constrained Optimal power Flow (CSCOPF) with Flexible Transmission Line Impedance (FTLI) to enhance the power system security. The corrective approach of SCOPF is chosen, because it allows the corrective equipment to bring back the system to a stable operating point and hence, it offers high flexibility and better economics. The concept of FTLI arises from the ability of FACTS devices such as Thyristor Controlled Series Capacitor (TCSC), which can vary the line reactance to a certain extent. An enhanced security can be achieved by incorporating FTLI into the CSCOPF problem, since the power flow in a system is highly dependent on the line reactance. FTLI based CSCOPF can reduce the amount of rescheduling of generators, but it will result in an increased number of variables and thus, the complexity to the optimization process is increased. This highly complex problem is solved by using nonlinear programming. The AC based OPF model is preferred, since the corrective security actions require highly accurate solutions. IEEE 30 bus system is used to test the proposed scheme and the results are compared with the traditional CSCOPF. It can be seen that the proposed idea provides a notable improvement in the reduction of cost incurred for restoring the system security.

关键词： Flexible Transmission Line Impedance power system security security Constrained Optimal

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Online Frequency security Assessment Based on Analytical Model Considering Limiting Modules

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CSEE Journal of power and Energy systems 2022年第5期8卷 1363-1372页

作者： Yuqian Zhang Qinglai Guo Yanzhen Zhou Hongbin Sun State Key Laboratory of power systems Department of Electrical EngineeringTsinghua UniversityBeijing 100084China

Due to the increasing implementation of high voltage direct current(HVDC)and the integration of renewable resources,frequency stability problems in power systems are drawing greater attention in recent *** has become necessary to carry out online frequency security assessments to ensure the safe operation of power *** the low time-efficiency of simulation-based methods,analytical models,such as the frequency nadir prediction(FNP)model,are more suitable for online assessment,which requires calculating the worst frequency deviation under various *** on the FNP model,the FNP-L model for online frequency security assessment is proposed in this *** proposed model implements security assessment by calculating and checking the frequency features,including the nadir time and frequency,followed by *** effect of the governor,including nonlinear constraints,is approximated into polynomial functions so that the results are obtained by solving multiple polynomial *** studies are carried out using the New-England 39-bus system and a regional power grid,which shows that the proposed model could achieve both high speed and high accuracy,and can therefore be applied in online security assessment.

关键词： Frequency response frequency stability power system security

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Suspension of Australian National Electricity Market in 2022 Necessitates Mechanism Evolution Ensuring power Supply security

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Journal of Modern power systems and Clean Energy 2023年第2期11卷 674-679页

作者： Zhenfei Tan Hua Geng Xiaoyuan Xu Sijie Chen Zheng Yan Key Laboratory of Control of power Transmission and Conversion Ministry of Educationand Shanghai Non-Carbon Energy Conversion and Utilization InstituteShanghai Jiao Tong UniversityShanghai 200240China

The National Electricity Market(NEM)in Australia was suspended during June 15-23,2022,with a primary attribution to the lack of available generation *** incident is noteworthy because it was the first market suspension in NEM’s history and took place in a major energy exporting *** this letter,we review the outline and impacts of the *** the perspectives of market regulation,electricity supply,and electricity demand,we identify three underlying causes of the market suspension and offer four recommendations for the market mechanism evolution to ensure power supply security.

关键词： Electricity market administered pricing power system security energy crisis demand response

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Data-driven Approach for State Prediction and Detection of False Data Injection Attacks in Smart Grid

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Journal of Modern power systems and Clean Energy 2023年第2期11卷 455-467页

作者： Haftu Tasew Reda Adnan Anwar Abdun Mahmood Naveen Chilamkurti Department of Computer Science and IT La Trobe UniversityBundooraVIC 3086Australia School of IT Deakin UniversityWaurn PondsVIC 3216Australia

In a smart grid,state estimation(SE)is a very important component of energy management *** main functions include system SE and detection of cyber ***,it has been shown that conventional SE techniques are vulnerable to false data injection(FDI)attack,which is a sophisticated new class of attacks on data integrity in smart *** main contribution of this paper is to propose a new FDI attack detection technique using a new data-driven SE model,which is different from the traditional weighted least square based SE *** SE model has a number of unique advantages compared with traditional SE ***,the prediction technique can better maintain the inherent temporal correlations among consecutive measurement ***,the proposed SE model can learn the actual power system ***,this paper shows that this SE model can be effectively used to detect FDI attacks that otherwise remain stealthy to traditional SE-based bad data *** proposed FDI attack detection technique is evaluated on a number of standard bus *** performance of state prediction and the accuracy of FDI attack detection are benchmarked against the state-ofthe-art *** results show that the proposed FDI attack detection technique has a higher detection rate compared with the existing techniques while reducing the false alarms significantly.

关键词： Data-driven false data injection machine learning power system security state estimation smart grid

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Evaluation of Buses in power Grids by Extended Entropic Degree

Evaluation of Buses in Power Grids by Extended Entropic Degr...

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第37届中国控制会议

作者： Chunchao Wu Xiaoliang Wang Fei Xue Xiaotong Xu Shaofeng Lu Lin Jiang Yujia Zhai SDIC Baiyin Wind power Co. LTD Xi’an Jiaotong-Liverpool University University of Liverpool

Complex network theory has been considered valuable in analyzing the security of networked infrastructures including power ***,the traditional pure topological assessment metrics ignore many characteristics in electrical *** most popular metrics for evaluation of nodes or buses in power grids are degree and *** integration of specific knowledge of electrical engineering,these metrics have been updated to entropic degree and e-betwenness in former ***,with consideration of local and global structural features,these two all have defects *** paper made integration of entropic degree and e-betweenness to develop a new concept as extended entropic degree by considering the e-betweenness of line as the weight in entropic *** new extended entropic degree can reflect both local and global structural features in evaluation of buses in power *** extended entropy degree was tested to verify the effectiveness in IEEE-30,IEEE-118,IEEE-300 and a United Kingdom distribution power *** results indicated that this new metric is more reasonable and effective in discovering structural features of buses in power grids.

关键词： Complex networks power system security power grid Degree Entropic degree Line Betweenness

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