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Asia Conference on Energy and Environment Engineering (ACEEE)

作者： He, Juntao Che, Renfei Meng, Xiaocheng Meng, Qingmeng Shandong Univ Sch Elect Engn Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China

After a large-scale grid failure, it is important for dispatchers to know the faulty components and causes and to develop the correct scheduling strategy. In this paper, a new fault diagnosis scheme is presented based on widely configured fault recorders. The proceeded algorithm using the wide-area recorder data to locate the fault components such as transmission lines, busbars and transformers. Different indicators are given for different components on the grid. A variety of criterion indexes are deduced for the transmission line using the distributed parameter model. The credibility of the judgment is improved by using multiple criteria. A search scheme based on the initial adjacency matrix is used to locate fault component on the grid. The fault area is defined according to the uploaded recorder data. The fault components are searched in the wide defined fault area according to the proposed scheme. The element with the greatest probability of failure is found. The three faulty elements simulation models based on PSCAD/EMDTC are established and studied, what's more, the power system model is also established to test the algorithm. The simulation results verify the effectiveness of the proposed method.

关键词： Electric lines

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Design and Implementation of Virtual Experimental Platform for power system Teaching 9

Design and Implementation of Virtual Experimental Platform f...

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9th International Conference on Information Technology in Medicine and Education (ITME)

作者： Fang, Tianyu Zhang, Hengxu Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan 250061 Shandong Peoples R China

ISBN: (纸本)9781538677438

The education of power system automation and control is a very important element of the industrialization process in developing countries. However, traditional experimental equipment requires a significant budget in promotion. And it mainly indudes hardware devices, which have a lot of limitations in the laboratory field, extensibility, comprehensiveness and practical teaching efficiency. This paper gives a detailed description of a virtual experimental platform for power system teaching (VEPS) based on object-oriented thinking, aiming to help users such as undergraduate students and researchers to realize the basic dynamic process of power system. The simulation modules of VEPS indude under frequency load shedding (UFLS), excitation control (EC), parallel control (PC) and complex power system operation (CPSO). The VEPS achieves the visualization of real-lime, time-series dynamic simulation and comparative analysis mode (CAM) of the power system, allowing students to set operation modes, system models and parameters to ensure flexibility and openness of the experiment. key issues of the platform, such as system architecture, experimental contents and promotion effect in college are emphatically discussed.

关键词： Educational experiment platform power system Analysis Virtual simulation Interactive environment

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Panoramic Synchronous Measurement system for Wide-area power system Based on the Cloud Computing 13

Panoramic Synchronous Measurement System for Wide-area Power...

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13th IEEE Conference on Industrial Electronics and Applications (ICIEA)

作者： Li, Yi Shi, Fang Zhang, Hengxu Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China

ISBN: (纸本)9781538637586

With plenty distributed generations accessing to the distribution network, dynamic behavior of the system becomes more complex. However, most of the current condition monitoring products are concentrated on the high voltage grid. It's necessary to extend condition monitoring to low voltage distribution network and provide a new decision support systems for grid operation. This paper presents a panoramic synchronous measurement system (PSMS), which is based on the cloud computing. This system integrates the wide-area measurement system (WAMS) and fault recorder system in high-voltage grid with the wide-area measurement system light (WAMS Light) in low-voltage grid. It constructs a four-tier structure in main station to achieve panoramic monitoring, which covers all voltage level. This method makes full use of the existing data sources and avoids repeated investment of monitoring network rebuilding. For the three kinds of measurement data different in the coding, type and format, this paper describes the common data character with big data perspective to integrate heterogeneous data in HBase. Hadoop is introduced to control the measurements migration, cleaning, integration and cloud computing, facilitating the dispatchers comprehensively capture the actual operation behavior of the monitored power grid.

关键词： Big Data cloud computing heterogeneous data condition monitoring Panoramic synchronous measurement system wide-area measurement system (WAMS) fault recorder

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Probabilistic Load Flow Analysis for power system Containing Wind Farms Based on Cumulant Method

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IOP Conference Series: Earth and Environmental Science 2021年第1期647卷

作者： Ming Gao Pan Lv Zhuan Zhou Jingya Li Jingjie Xue Bo Zhang Donglei Sun Economic and Technical Research Institute of Xinjiang Electric Power Co. Ltd. Urumqi Xinjiang 830000 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan Shandong 250061 China

In this paper, a probabilistic load flow computation method based on the cumulants and Edgeworth expansion theory is put forward, and is used in the analysis of system containing wind farms composed of doubly-fed induction generator. Firstly a 2-parameter Weibull function is adopted to fit the random distribution of wind speed, and then the probabilistic model for wind power generator can be established based on active power output characteristic of wind power generator. Based on the linearized AC load flow model, analysis for IEEE 30-node system with wind farm is carried out. Finally the method is compared with Monte-Carlo simulation method, and the effects of wind farms integrated to the operation of power system is analysed in detail.

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Study on Time-frequency Analysis Method of Very Fast Transient Overvoltage 9

Study on Time-frequency Analysis Method of Very Fast Transie...

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9th International Conference on Graphic and Image Processing (ICGIP)

作者： Li, Shuai Liu, Shiming Huang, Qiyan Fu, Chuanshun Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China

ISBN: (数字)9781510617421

ISBN: (纸本)9781510617421

The operation of the disconnector in the gas insulated substation (GIS) may produce very fast transient overvoltage (VFTO), which has the characteristics of short rise time, short duration, high amplitude and rich frequency components. VFTO can cause damage to GIS and secondary equipment, and the frequency components contained in the VFTO can cause resonance overvoltage inside the transformer, so it is necessary to study the spectral characteristics of the VFTO. From the perspective of signal processing, VFTO is a kind of non-stationary signal, the traditional Fourier transform is difficult to describe its frequency which changes with time, so it is necessary to use time-frequency analysis to analyse VFTO spectral characteristics. In this paper, we analyse the performance of short time Fourier transform (STFT), Wigner-Ville distribution (WVD), pseudo Wigner-Ville distribution (PWVD) and smooth pseudo Wigner-Ville distribution (SPWVD). The results show that SPWVD transform is the best. The time-frequency aggregation of SPWVD is higher than STFT, and it does not have cross-interference terms, which can meet the requirements of VFTO spectrum analysis.

关键词： Time-frequency analysis very fast transient overvoltage (VFTO) spectrum analysis non-stationary signal

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Longitudinal Protection Based on Phase Trajectory of Fault Component Instantaneous power

Longitudinal Protection Based on Phase Trajectory of Fault C...

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Compatibility in power Electronics (CPE)

作者： Shiming Liu Yuhao Zhang Jukun Wu Xisong Zhu Guochao Zhao Key Laboratory of System Intelligent Dispatch and Control Shandong University Jinan China Shandong University Jinan China Zhangjiakou Power Supply Company Zhangjiakou China

Active power differential protection has advantages in eliminating the influence of reactive power factors and identifying high-resistance faults, and the data self-synchronization method can eliminate the synchronization error. power differential protection based on data self-synchronization method combines the advantages of both, but the protection speed needs to be improved. Based on phase space theory, this paper constructs the phase space of fault component instantaneous power and analyzes its characteristics. Longitudinal protection based on the phase trajectory of fault component instantaneous power is proposed, which identifies faults by the center position of the trajectory. The simulations of the IEEE 9-node system shows that the protection has a faster speed and can correctly identify faults in various synchronization exception scenarios.

关键词： Trajectory Synchronization Fault diagnosis Time-frequency analysis Manganese Delays

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Distributed Bilinear State Estimation Based on ADMM for Integrated Energy system Combining Electricity, Heat and Gas

Distributed Bilinear State Estimation Based on ADMM for Inte...

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IEEE power and Energy Society General Meeting

作者： Yaxin Du Wen Zhang Tingting Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education School of Electrical Engineering Shandong University Jinan P. R. China

With the rapid development of integrated energy system (IES), there is an urgent need to implement state estimation to obtain accurate system-wide states for online analysis and optimal dispatch. Moreover, compared with the centralized scheme, distributed state estimation is more practical for IES due to the preservation of privacy, low communication burden, and high efficiency. This paper proposes a distributed bilinear state estimation algorithm based on the alternating direction method of multipliers (ADMM), which is applicable to IES combining electricity, heat, and gas. Based on the bilinear state estimation model, the conventional state estimation for IES is converted to a three-stage convex problem, including two linear estimation stages and an intermediate nonlinear transformation stage. Each of the three stages is further decoupled over the three sub-systems to perform a fully distributed state estimation via ADMM. A modified ADMM with self-adjusting penalty parameter is adopted to accelerate the convergence of ADMM iterations. Simulation results demonstrate the validity of the proposed algorithm.

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Ultra-Short-Term Wind Generation Forecast Based on Multivariate Empirical Dynamic Modeling

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IEEE TRANSACTIONS ON INDUSTRY APPLICATIONS 2018年第2期54卷 1029-1038页

作者： Ma, Jiayi Yang, Ming Han, Xueshan Li, Zhi Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250000 Shandong Peoples R China Shandong Prov Elect Power Co State Grid Corp China Jinan 250001 Shandong Peoples R China

Wind generation forecast approaches are typically based on fixed model structures, which might fit well with existing data but fall short in forecasting out-of-sample data. The reason lies in that predetermined models cannot always capture the actual dynamic features of wind farms, resulting in unavoidable model errors. In this paper, a novel ultra-short-term wind generation forecast approach based on multivariate empirical dynamic modeling is proposed. The time series of wind generation and the explanatory variables are applied for attractor reconstruction according to Takens' theorem. By this means, the dynamics of the original wind generation system can be accurately captured by the trajectories of the state variables in the reconstructed space. Then, using a simplex projection approach, wind generation can be directly forecasted with the trajectories. A unique feature of the proposed approach is that its effectiveness depends solely on the potential context hidden in the sequences of the state variables rather than the correctness of the predetermined models. Consequently, this approach can faithfully depict the dynamics of wind farms and improve the forecast accuracy. Case studies illustrate that the proposed approach can obtain advanced forecast results comparing with the benchmark methods.

关键词： Attractor reconstruction multivariate empirical dynamicmodeling (MEDM) simplex projection Takens' theorem wind generation (WG) forecast

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Optimal Siting and Sizing of Wind Farm Considering Peak Load Regulation Capability of power system

Optimal Siting and Sizing of Wind Farm Considering Peak Load...

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

作者： Xiuping Zhang Mingqiang Wang Xiaoyan Wang Yichen Song Yuqian Wu Shun Xie Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China State Grid Shandong Electric Power Company Construction Company Jinan China

ISBN: (数字)9781728131375

ISBN: (纸本)9781728131382

Wind curtailment caused by lack of peak load regulation capability invalidates the large-scale installed wind energy capacity and results in low economic efficiency. Based on the daily fluctuation and seasonal operation pattern of wind power and load, this paper introduces two extreme scenarios to describe the impact of wind power integration on peak load regulation of power system. A wind farm planning model considering the peak load regulation capability is proposed. The objective of the model is to maximize the total profit with the system operation constraints considered. After solving the proposed model, the optimal construction site and size of wind farm can be obtained. Case study on IEEE 24-node 38-bus test system verifies the effectiveness of the proposed model.

关键词： Wind power generation Load modeling Wind farms power systems Planning Fluctuations Mathematical model

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Modeling and fault analysis of solar photovoltaic grid-connected systems under solar radiation fluctuation consideration

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INTERNATIONAL TRANSACTIONS ON ELECTRICAL ENERGY systemS 2018年第8期28卷 e2576.1-e2576.16页

作者： Tekpeti, Browh Serge Kang, Xiaoning Kheshti, Mostafa Jiao, Zaibin Xi An Jiao Tong Univ Shaanxi Key Lab Smart Grid Xian 710049 Shaanxi Peoples R China Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China

This paper presents photovoltaic (PV) systems modeling and fault analysis with solar energy fluctuation to discuss maximum fault current profiles. The modeled PV farm is arranged with series and parallel PV modules to offer 6.5kV power. Two-level 3-phase voltage source inverter (VSI) and dc-dc boost converter are used for all PV systems with LCL filter. A current control strategy using synchronous rotating frame method is implemented with park transformation approach. Average and aggregate models give inaccuracy, which this paper overcomes with accurate isolated single PV system, and PV-dominated feeder. Pulse width modulation and sinusoidal pulse width modulation techniques are applied. Incremental conductance maximum power point tracking technique is used to extract PV maximum power. Phase locked loop technique for grid synchronization and proportional integral voltage control technique are also applied. Here, the maximum fault current corresponds to the maximum phase current at specified time. This simple and effective method is applied on PSCAD software simulations to collect the data. Discussions on obtained results showed short-time irradiation fluctuation impacts on fault current profiles and argue on related aspects. The data comments and explanations to address analyzed protection challenges with PV penetration in distribution system are very promising.

关键词： current control strategy fault analysis maximum fault current photovoltaic systems solar radiation fluctuation voltage source inverter

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