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International Symposium on power Electronics and control Engineering (ISPECE)

作者： Zhang, Ruiqi Sun, Hua Dong, Xiaoming Shandong Univ Key Lab Power Syst Intelligent Dispatch & Control Minist Educ Jinan Shandong Peoples R China Shandong Labor Vocat & Technol Coll Dept Elect Automat Jinan Shandong Peoples R China

Electro-thermal coupling theory can be used as an effective tool to analyse the thermal characteristics of power cables. As the carrier for transmitting electrical power, cables can convey alternating current(AC) as well as direct current(DC) and have different thermal characteristics under different current forms. This paper analyses the ampacity of electric cables based on electro-thermal coupling, and compares the influence of the thermal resistance of different materials in the cable. Case study reveals the thermal characteristics under different current forms by simulating temperature variations of the two cables.

关键词： Cables

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Active power support of wind turbines for grid frequency events using a reliable power reference scheme

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RENEWABLE ENERGY 2019年 139卷 1241-1254页

作者： Kheshti, Mostafa Ding, Lei Nayeripour, Majid Wang, Xiaowei Terzija, Vladimir Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan Shandong Peoples R China Cologne Univ Appl Sci Cologne Germany Xi An Jiao Tong Univ Sch Elect Engn Xian Shaanxi Peoples R China Univ Manchester Sch Elect & Elect Engn Manchester Lancs England

High penetration of wind turbines (WTs) is causing reduction of power system rotating inertia so that the power grid is becoming more vulnerable to large active power imbalances. Inertial control can be applied on WTs to increase their output power with a predefined power reference scheme. However, these approaches have adverse secondary frequency drop or very slow rotor speed recovery that may worsen the grid frequency regulation if an uncertain change such as wind drop occurs. This paper proposes a reliable power reference scheme for participation of WTs in grid frequency arrest that follows a linear trajectory as a function of rotor speed. Simulations on large-scale integrated wind farms into IEEE 9-bus and New England 39 bus systems are conducted and the results of grid frequency regulation in presence of different changes are studied and compared with other methods. Also, active power contribution of WTs in a combined emission economic dispatch form is studied. The results and comparisons with other methods show the effectiveness of the proposed power reference scheme of WTs in grid frequency regulation. They also show the importance of considering sudden changes during inertial control when designing an inertial control system. By using the proposed scheme, it is recommended to set power increment of WTs to half of power mismatch in the grid to obtain maximum frequency regulation. (C) 2019 Elsevier Ltd. All rights reserved.

关键词： Grid frequency regulation Secondary frequency drop Linear power reference Inertial control Wind turbine

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Assessment of Wind power Ramp Events Based on Stacked Denoising Autoencoder 8

Assessment of Wind Power Ramp Events Based on Stacked Denois...

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

作者： Liang, Zhixiang Liu, Yutian Liu, Xiaoming Cao, Xiangyang Zhang, Liudong Wu, Haiwei Zhang, Qibing Yang, Ming Shandong University Ministry of Education Key Laboratory of Power System Intelligent Dispatch and Control Jinan250061 China Economic Technology Research Institute State Grid Shandong Electric Power Company Jinan250001 China State Grid Jiangsu Electric Power Company Nanjing210032 China

ISBN: (纸本)9781728117225

Wind power ramp events had a significant impact on the power balance of power system and may lead to load shedding. A data driven method was proposed for wind power ramp events assessment in this paper. The K-means clustering algorithm was used to divide the samples to several classes. The stacked denoising autoencoder was used to extract layer features to train support vector machine. Historical and forecast data of wind power, load power, conventional unit and pumped storage station power were taken as inputs. The output was whether ramp event occurred. A severity function was constructed to assess the severity grade which was predicted to be a wind power ramp event based on effect theory. The credibility of the assessment result was represented by confidence interval. Simulation results of a provincial power grid showed that the prediction method in this paper was more accurate and credibility was high enough to help the dispatchers to take measures for the security of power grid. © 2019 IEEE.

关键词： Grading

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Dual Grid Voltage Modulated Direct power control of Grid-Connected Voltage Source Converter under Unbalanced Network Condition

Dual Grid Voltage Modulated Direct Power Control of Grid-Con...

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2019 IEEE PES Innovative Smart Grid Technologies Asia, ISGT 2019

作者： Gao, Shuning Zhao, Haoran Gui, Yonghao School of Electrical Engineering Shandong University Ji'nan250061 China Key Laboratory of Power System Intelligent Dispatch and Control Ministry of Education Shandong University Ji'nan250061 China Automation and Control Section Department of Electronic Systems Aalborg University Aalborg Denmark

ISBN: (纸本)9781728135205

The Grid voltage Modulated Direct power control (GVM-DPC) for Voltage Source Converter (VSC) is a recently proposed superior control strategies which features several advantages such as fast power reference tracking, simple structure, no need to use synchronizing techniques, strong robustness and so on. In this paper, an improved Dual Grid Voltage Modulated Direct power control (D-GVM-DPC) strategies for unbalanced grid voltage condition is proposed and compared with regular voltage oriented dual PI control techniques. The idea of this improvement is to separately control the positive and negative sequence power components based on the original GVM-DPC controller. The simulation results shows that the proposed strategy is superior to the dual current control schemes been used with voltage oriented control strategy. © 2019 IEEE.

关键词： Electric power transmission networks

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Input data analysis for the thermal rating prediction of the overhead conductor

Input data analysis for the thermal rating prediction of the...

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2019 International Conference on Civil Engineering, Environment Resources and Energy Materials, CCESEM 2019

作者： Wenbo, Li Luhua, Xing Shanqiang, Fu Huadong, Li Zhe, Jiang Bo, Chen Electric Power Research Institute State Grid Shandong Electric Power Company Shandong Province Jinan250003 China Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Jinan China Jining Power Supply Company State Grid Shandong Electric Power Company Jining Shandong Province272100 China

The thermal rating of the overhead conductor is closely related to meteorological factors such as wind speed, wind direction, ambient temperature and solar radiation. Therefore, both the historical thermal ratings and meteorological data are alternative input data to predict the thermal rating of the overhead conductor. It is important to select suitable input data to improve the prediction accuracy of the prediction results. Based on the collection of micro-meteorological data from overhead line monitoring system, this paper presents a method to determine the input data for the thermal rating prediction by analysing the autocorrelation of overhead thermal ratings and the cross-correlation between thermal rating and historical micrometeorological data. The results show that the proposed method can provide reference information for the selection of predictive input quantities and prediction time domain. © Published under licence by IOP Publishing Ltd.

关键词： Input output programs

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Single-phase-to-ground fault diagnosis method based on waveform features and association rule algorithm 8

Single-phase-to-ground fault diagnosis method based on wavef...

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8th Renewable power Generation Conference, RPG 2019

作者： Zhang, Linlin Xu, Kai Shi, Fang Wang, Yunbo Liu, Shuozheng Key Laboratory of Power System Intelligent Dispatch and Control of the Ministry of Education Shandong University 17923 Jingshi Road Jinan China Shenhua Guoneng Shandong Construction Group Jinan250001 China Guangxi Power Grid Company Nanning Power Supply Company 43 Xingguang Road Nanning China

ISBN: (纸本)9781839531255

The single-phase-to-ground fault current of distribution network is small, which brings difficulties to fault diagnosis. A single-phase-to-ground fault diagnosis method based on synchronous waveform feature extraction and association rule mining is proposed. Firstly, features are extracted from waveform of fault recorders to describe the fault scene. Then, FP-Growth algorithm is used to mine the association rules in the fault transaction database. The effectiveness of proposed method is verified by IEEE 34-bus system. Algorithm in this paper provides a useful reference for fault diagnosis technology based on fault waveform features. © 2019 Institution of Engineering and Technology. All rights reserved.

关键词： Failure analysis

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Optimal active power control based on MPC for DFIG-based wind farm equipped with distributed energy storage systems

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2019年 113卷 154-163页

作者： Huang, Sheng Wu, Qiuwei Guo, Yifei Rong, Fei Tech Univ Denmark Dept Elect Engn Ctr Elect Power & Energy Elektrovej 325 DK-2800 Lyngby Denmark Shandong Univ Sch Elect Engn Minist Educ Key Lab Power Syst Intelligent Dispatch & Control Jinan 250061 Shandong Peoples R China Hunan Univ Coll Elect & Informat Engn Elect Engn Changsha 410082 Hunan Peoples R China

An optimal active power control scheme based on model predictive control (MPC) is proposed for a doubly-fed induction generator (DFIG)-based wind farm equipped with distributed energy storage systems (ESSs). A two-stage optimal control scheme is proposed. In the first stage, the power reference of each WT and the total power command of ESSs are generated, aiming to reduce the fatigue load of WTs by minimizing variations of thrust force and shaft torque. In the second stage, the charge/discharge power of ESSs are optimized to achieve the fair power sharing and maximize the capacity margin. An MPC based optimization problem is formulated for the constrained multiple input and multiple output (MIMO) wind farm system. The dynamics of converters and WTs are taken into account by the MPC. With the proposed control scheme, the active power references are optimized between WTs and ESSs according to their local wind conditions. Fatigue loads of WTs are reduced efficiently by coordinating the DFIG-based WTs and distributed ESSs. A wind farm with 10 DFIG-based WTs was used to validate the control performance of the proposed optimal active power control scheme.

关键词： DFIG Distributed ESSs Fatigue loads MPC

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A Fast DC Line Protection for MMC-MTDC Grids Based on PSVTWs

A Fast DC Line Protection for MMC-MTDC Grids Based on PSVTWs

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IEEE power and Energy Society General Meeting

作者： Shuo Zhang Guibin Zou Qiang Huang Houlei Gao Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Ji'nan China

This paper proposes a fast non-unit direct current (DC) line protection for modular multilevel converter (MMC)-based multiterminal high voltage direct current (MTDC) grids based on positive-sequence voltage traveling waves (PSVTWs). The propagation characteristics of voltage traveling waves (VTWs) are first analyzed to obtain the transfer functions of PSVTWs from the fault location to the relay location under typical internal and external faults. By comparing the transfer functions in frequency domain, the protection criterion is developed. In addition, the method to obtain the protection threshold is presented in this paper, which is independent on simulation. The performance of the protection is verified by extensive simulations in PSCAD/EMTDC software.

关键词：

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A Novel Fault Current Limiter for MMC-Based HVDC system

A Novel Fault Current Limiter for MMC-Based HVDC System

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International Conference on Advanced power system Automation and Protection (APAP)

作者： Qiang Huang Guibin Zou Houlei Gao Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Ji’nan China

ISBN: (数字)9781728117225

ISBN: (纸本)9781728117232

In the modular multilevel converter (MMC)-based HVDC system, the fault current rises rapidly when a dc side fault occurs. To avoid the damage to the semi-conductors, fault current limitation is necessary. For the fault current limiter proposed in this paper, the current flows through the thyristers in the normal operation state, while it will flow through the current limiting resistors due to the turning off of the thyristers by the commutation capacitor when a dc fault occurs. To provide theoretical basis to the choice of the main parameters of the fault current limiter, this paper analyzed the current of every branch in the fault current limiter. The simulation results of the model built in PSCAD/EMTDC verified the correctness of the theoretical analysis and the effectiveness of the proposed fault current limiter.

关键词： Circuit faults Fault currents Capacitors Fault current limiters Limiting Resistors Inductors

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Non-unit transient based boundary protection for UHV transmission lines

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INTERNATIONAL JOURNAL OF ELECTRICAL power & ENERGY systemS 2018年 102卷 349-363页

作者： Luo, S. B. Gao, H. L. Wang, D. Zou, G. B. Shandong Univ Minist Educ Key Lab Power Syst Intelligent Dispatch & Control 17923 Jingshi Rd Jinan 250061 Shandong Peoples R China

Different from EHV transmission lines, the boundary of UHV transmission lines naturally consists of busbar stray capacitance, shunt reactor and/or series capacitor. The frequency characteristics of the UHV line boundaries with different structures are analyzed deeply, which have significant attenuation on both high frequency signal and low frequency signal. The attenuation is the inherent characteristic of UHV line boundary. Based on the UHV boundary characteristic, a novel boundary protection principle utilizing backward traveling wave is proposed. The fault direction is identified by means of the time-domain energy of the backward traveling wave. The high frequency energy and the low frequency energy of the backward traveling wave are extracted by wavelet transform, and then the forward internal and external faults are discriminated by the product of high frequency energy and low frequency energy. An adaptive setting calculation method in terms of fault type is presented, which is able to improve effectively the right discriminating rate for internal faults. The simulation model of Jindongnan-Nanyang-Jingmen UHV transmission project is established in ATP/EMTP. The simulation results show that the boundary protection possesses stable performance under various fault situations, and the operation time is less than 2 ms, which is appropriate as the non-unit ultra-high-speed protection element for UHV transmission lines.

关键词： UHV transmission lines Boundary protection Non-unit transient based protection Ultra high speed Backward traveling wave Wavelet transform

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