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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Zhaoqing Wang Chengfu Wang Jun Liang Xueli Wang Libin Yang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China State Grid Shandong Electric Power Maintenance Company Jinan China State Grid Qinghai Electric Power institute Xining China

ISBN: (纸本)9781467371070

Randomness and volatility are the inherent attributes of wind power, and the present method for forecasting wind power is not accurate enough. However, the exact description of forecast error has obvious effect on optimized scheme of power flow calculation, unit commitment and operation in the power system with wind power. The wind forecast error is different under the power dimension and correlative under time dimension, so it can describe the actual wind power attributes more accurately on the basis of fitting the forecast error divided into different groups according to the power-time attributes. The parameters distribution like normal distribution can not describe the error in different bins accurately, but this paper proposed non-parameter kernel density estimation (NKDE) to fit the error data in various bins, which is also suitable for various forecast methods. If ignoring the characteristic of NKDE, it has poor fitting effect because of too many bins and too few data in some bins. This paper proposed a method to reduce the number of bins to improve the fitting effect and reduce calculation time. Results for this case show the proposed probability density function (pdf) is more close to the actual wind power error distribution.

关键词： error analysis fitting effect power-time dimension correlation

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Fault transient simulation analysis for HVDC transmission lines

Fault transient simulation analysis for HVDC transmission li...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Luhua Xing Dong Yang Dandan Zhang Wenbo Li Qing Chen State Grid Shandong Electric Power Research Institute Jinan China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan China

Fault transient analysis plays an important role in protection and fault location research for high voltage direct current (HVDC) transmission lines. Fault transient simulation methods and analysis for HVDC transmission lines are detailed presented in this paper, to avoid repetitive tasks and waste of research efforts. Influences of the control system, operation modes and direct current (DC) filter links on the fault transient simulation analysis for HVDC transmission lines are discussed. Transient characteristics of voltages and currents on HVDC transmission lines for faults on HVDC transmission lines, lightning strokes and commutation failures are analyzed, and corresponding simulation methods are also given.

关键词： Lightning Transient analysis power industry Bidirectional control Resistance Decision support systems

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Analysis on single-phase line break fault of 10kV non-grounded distribution network

Analysis on single-phase line break fault of 10kV non-ground...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Rui Wang Wei Cong Qibao Kang Guoqiang Liu Hui Wang Ruipeng Yi Key Laboratory of Power System Intelligent Dispatch and Control Shandong University Jinan Shandong Province China Binzhou Power Company State Grid Shandong Corporation Binzhou Shandong Province

ISBN: (纸本)9781467371070

Line break fault is becoming more and more frequent in 10kV neutral point non-grounded distribution system. This paper takes 10kV distribution line single-phase line break fault as the research object, analyzes the characteristics of electrical quantities when single-phase line break fault occurs, including single-phase line break without grounding point, single-phase line break with grounding at power supply side and single-phase line break with grounding at load side. Electrical quantities during single-phase line break fault are analyzed using symmetrical component method with sequence network and vector diagram, the variation of electrical quantities are summarized, and protection criterion for single-phase line break fault is proposed. Simulation results by PSCAD/EMTDC ensure the correctness of the analysis results and line break protection criterion.

关键词： Grounding Decision support systems power supplies Impedance power industry Simulation Analytical models

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DC fault analysis of VSC-HVDC and DC cable protection principle

DC fault analysis of VSC-HVDC and DC cable protection princi...

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IEEE PES Asia-Pacific power and Energy Engineering Conference (APPEEC)

作者： Pu Zhao Qing Chen Luhua Xing Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University) Ministry of Education Jinan China Shandong University Jinan Shandong CN State Grid Shandong Electric Power Research Institute Jinan China

ISBN: (纸本)9781467381338

Voltage Source Converter (VSC) based HVDC (VSC- HVDC) transmission technology as a kind of new dc transmission, is attracting more and more research. VSCs are susceptible to cable short-circuit fault and ground fault. This paper focuses on the transient characteristics of electrical quantities in a two terminal VSC-HVDC system after the occurrence of short-circuit fault and ground fault. Equivalent circuits and equations are given to calculate the voltage and over-current in cable. Simulations are undertaken in PSCAD to verify the calculation results, and different fault points and fault resistances are considered. Due to the behaviors of DC voltage and cable over-current in faulty cable and non-faulty cable after the ground fault, a DC cable protection principle was proposed to determine the faulty cable and to decide fault within or outside the protected area.

关键词： Circuit faults power conversion power cables Capacitors Equivalent circuits Transient analysis

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Coordinated optimization for controlling short circuit current and multi-infeed DC interaction

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Journal of Modern power Systems and Clean Energy 2014年第4期2卷 374-384页

作者： Dong YANG Kang ZHAO Yutian LIU State Grid Shandong Electric Power Research Institute Jinan 250002China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China

Due to increased penetration of renewable energies,DC links and other emerging technologies,power system operation and planning have to cope with various uncertainties and *** order to solve the problems of exceeding short circuit current and multi-infeed DC interaction,a coordinated optimization method is presented in this ***,a branch selection strategy is proposed by analyzing the sensitivity relationship between current limiting measures and the impedance ***,the impact of network structure changes on the multi-infeed DC system is *** the coordinated optimization model is established,which considers the cost and effect of current limiting measures,the tightness of network structure and the voltage support capability of AC system to multiple ***,the non-dominated sorting genetic algorithm II combining with the branch selection strategy,is used to find the Pareto optimal *** studies on a planning power system demonstrated the feasibility and speediness of this method.

关键词： operation and planning Multiple DC infeed Short circuit current Sensitivity analysis Multi-objective optimization

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Consistency analysis of SCADA data from field power systems

Consistency analysis of SCADA data from field power systems

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10th International Conference on Advances in power System control, operation & Management (APSCOM 2015)

作者： Yaping Zhang Hengxu Zhang Liang Wang Guangsong Hou Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education School of Electrical Engineering Shandong University Jinan China Dispatch and Control Center of Shandong Electric Power Corporation Jinan China Heze Power Supply Company of State Grid Shandong Electric Power Corporation China

ISBN: (纸本)9781510830059

SCADA (Supervisory control And Data Acquisition) system is a basic infrastructure of modern power systems. SCADA data are widely used in applications such as state estimation, power flow calculation, and on-line security assessment. The accuracy of the SCADA data directly affects the implementation of power system automatic control. In practice, the error of the SCADA data may deviate from its factory precision due to the influence of the equipment aging, data transmission and so on. To quantitatively evaluate the validity of the SCADA data, a consistency index is defined in this paper. Some SCADA data from several substations of a power gird is checked with the consistency index to reveal its reliability.

关键词： consistency power systems SCADA error analysis

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control of hybrid AC/DC microgrid under islanding operational conditions

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Journal of Modern power Systems and Clean Energy 2014年第3期2卷 223-232页

作者： Guangqian DING Feng GAO Song ZHANG Poh Chiang LOH Frede BLAABJERG Key Laboratory of Power System Intelligent Dispatch and Control(Shandong University) Ministry of EducationJinan 250061China State Grid of China Technology College JinanChina Department of Energy Technology Aalborg UniversityAalborgDenmark

This paper presents control methods for hybrid AC/DC microgrid under islanding operation *** control schemes for AC sub-microgrid and DC sub-microgrid are investigated according to the power sharing requirement and operational *** addition,the key control schemes of interlinking converter with DC-link capacitor or energy storage,which will devote to the proper power sharing between AC and DC sub-microgrids to maintain AC and DC side voltage stable,is *** the specific control methods developed for AC and DC sub-microgrids with interlinking converter,the whole hybrid AC/DC microgrid can manage the power flow transferred between sub-microgrids for improving on the operational quality and efficiency.

关键词： Microgrid Islanding operation Distributed generation Hybrid AC/DC microgrid Inverter power flow

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Consistency analysis of DFIG wind generation models in PSS/E and PSASP

Consistency analysis of DFIG wind generation models in PSS/E...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies (DRPT)

作者： Tao Fu Hengxu Zhang Changgang Li Qingwen Xu Xiaoming Liu Ji Zhang Chao Qi Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education School of Electrical Engineering of Shandong University Jinan China School of Electrical and Electronic Engineering Shandong University of Technology Zibo China Economic&Technology Research Institute State Grid Shandong Electric Power Company Jinan China

ISBN: (纸本)9781467371070

With rapid increase of wind power installed capacity, the operation mode of power system has changed greatly, it is necessary to include modeling and simulation based on wind turbines and farms. Numerical simulation plays a unique role in power system operation and control, and its accuracy turns out to be the focus of electric industry. PSASP and PSS/E, as two main sorts of simulation analysis software at home and abroad respectively, both enable wind turbines electromechanical transient simulation. In this paper, Detailed comparisons are made between Doubly-fed induction generator (DFIG) in PSS/E and PSASP. Finally, simulative results of power system including the models are compared and analyzed.

关键词： control systems power industry Numerical simulation Induction generators Numerical models Frequency conversion

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Thevenin Equivalent Circuit Parameter Estimation for the PCC Upstream System

Thevenin Equivalent Circuit Parameter Estimation for the PCC...

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International Conference on Electric Utility Deregulation and Restructuring and power Technologies

作者： Yuanyuan Sun Chuankai Dai Jiaqi Li Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Jinan China State Grid Qingdao Electric Power Company Qingdao China

ISBN: (纸本)9781467371070

The Thevenin equivalent circuit parameters for the upstream system seen at a load bus plays an important role in the power system operation and planning. In order to accurately estimate the Thevenin equivalent parameters for the upstream supply system, an estimation method not requiring synchronized measurement is used in this paper. The characteristics of the probability curves of load voltage and impedance fluctuations have been analyzed, based on which the data selection criteria has been established. The field measurement data from different substations are processed by the proposed methods, and abnormal data has been filtered out in order to increase the accuracy of the estimated parameters. The validity and accuracy of the proposed method has been verified by both the simulation and field measurement data.

关键词： Data selection system parameter estimation Thevenin equivalent circuit synchronizing data

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Sustained overvoltage control considering power system restoration dynamic process

Sustained overvoltage control considering power system resto...

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2014 International Conference on Energy Research and power Engineering, ERPE 2014

作者： Chen, Bin Wang, Hong Tao Wei, Zhong Kang Wang, Chun Yi Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan 250061 China State Grid Jibei Electric Power Company Beijing 100053 China State Grid Shandong Electric Power Company Jinan 250001 China

ISBN: (纸本)9783038351603

Changeable sensitivity and safety margin are proposed in this paper, which can avoid the voltage violation according to the operation of the current situation. A simulation test is presented to demonstrate the proposed method can decrease adjusting amounts and restoration time efficiently. © (2014) Trans Tech Publications, Switzerland.

关键词： Restoration

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