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control of hybrid AC/DC microgrid under islanding operational conditions

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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Coordinated control of variable-speed constant-frequency wind farms in weak grids

Coordinated control of variable-speed constant-frequency win...

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

作者： Li, Chao 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

Variable-speed constant-frequency (VSCF) wind farms are gradually becoming a significant proportion of generation in weak grids with constantly increasing penetration rate, and it should certainly take responsibility of the grid frequency and voltage stability. Based on the P-Q performance curve of doubly fed induction generator (DFIG), by introducing static synchronous compensator (STATCOM), this paper presents a coordinated control strategy of active power and reactive power to deal with fault and load disturbance in weak grids. Simulation results show that the proposed coordinated control strategy can effectively improve the frequency and voltage stability of the grids. © (2014) Trans Tech Publications, Switzerland.

关键词： Wind farm

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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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Applications of coordinated automatic voltage control integrated for regional, provincial and prefectural control centers in China Southern power grid

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Dianli Xitong Zidonghua/Automation of Electric power Systems 2014年第13期38卷 208-215页

作者： Wang, Bin Guo, Qinglai Zhou, Huafeng Tang, Lei Gu, Huijie Sun, Hongbin Department of Electrical Engineering Tsinghua University Beijing100084 China State Key Laboratory of Control and Simulation of Power Systems and Generation Equipments Tsinghua University Beijing100084 China China Southern Power Grid Dispatching Control Center Guangzhou510623 China

In order to avoid irrational reactive power flow and voltage distribution, the coordinated voltage controlsystem integrated for regional, provincial and prefectural control centers in China Southern power grid is proposed. The reactive power and voltage operation and control characteristics of China Southern power grid are analyzed. The hierarchical architecture of coordinated voltage controlsystem integrated for regional, provincial and prefectural control centers is described. Some typical applications are emphasized, including the coordination between regional and provincial control centers, the coordination between provincial and prefectural control centers, the voltage control for substations considering the provincial coordinate constraints, the coordinated voltage control for the high voltage direct current (HVDC) neighboring grids, etc, the exchange data content and mode between regional, provincial and prefectural control centers are described. The coordinated voltage control system is currently in real time operation in China Southern power grid. © 2014 State grid Electric power Research Institute Press

关键词： Reactive power

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Open Architecture and Its Implementation of power System Numerical Simulation Software

Open Architecture and Its Implementation of Power System Num...

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2014 International Conference on Artificial,Intelligence and Software Engineering(AISE 2014)

作者： Wen-xin LYU Xin-huan JIANG Qun XU Heng-xu ZHANG Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Qingdao Power Company Shandong State Grid Corporation of China

An open architecture of power system numerical simulation software is proposed, the interface information between simulation engine and user program is exchanged by Client/Server implementation. The open application program interface is realized by establishing an identical and standardized database(a normalized function interface table) on both sides so that they can understand each other through table searching. The client-side secondary development is not limited to single programming language. Interface software packages have been developed for different programming languages including C++, Matlab and Python. It is verified that the proposed framework has powerful openness as well as flexibility, which will greatly improve the calculating and analyzing capabilities of the power system numerical simulation software.

关键词： power system Numerical simulation Application program interface(API) Open architecture

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A coordination control strategy of voltage source converter based MTDC for offshore wind farms

A coordination control strategy of voltage source converter ...

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2014 IEEE Industry Application Society Annual Meeting, IAS 2014

作者： Ren, Jing-Guo Li, Ke-Jun Sun, Lijun Zhao, Jian-Guo Liang, Yong-Liang Lee, Wei-Jen Ding, Zhao-Hao Sun, Ying Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong University Jinan250061 China State Grid of China Technology College Jinan250002 China Energy Systems Research Center University of Texas at Arlington ArlingtonTX76019 United States Shandong Electric Power Research Institute China

ISBN: (纸本)9781479922888

This paper proposes a coordination control strategy of voltage source converter based multi-terminal DC (VSC-MTDC) transmission system for integrating large-scale offshore wind power. Using a typical five-terminal DC transmission system as an example, coordination control strategy based on local controller among converter stations is proposed. Based on the DC voltage -Active power characteristic, improved control strategy for auxiliary converter station and APC converter station are proposed respectively. Also the working mode of the two converter stations is analyzed. The basis of parameter selection of auxiliary converter station and APC converter station is presented due to DC power flow distribution and maximum and minimum operational mode. Finally, simulations in PSCAD/EMTDC are conducted to validate the multi-point DC voltage control method under various operating state in normal, master converter station fault and auxiliary converter station fault conditions respectively. Results show that this method can guarantee the active power allocation of VSC-MTDC transmission system and good control effects are obtained. © 2014 IEEE.

关键词： Offshore wind farms

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A fault diagnosis model of power transformer using Imperialistic Competitive Algorithm and Support Vector Machine

A fault diagnosis model of power transformer using Imperiali...

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The 2014 IMSS International Conference on Future Manufacturing Engineering(ICFME 2014)

作者： Yiyi Zhang Zhihua Zhong Hanbo Zheng Chao Tang Yan Sun Guangxi Key Laboratory of Power System Optimization and Energy Technology Guangxi University Archives of Guangxi University State Grid Henan Electric Power Research Institute College of Engineering and Technology Southwest University Guangxi Power Grid Power Dispatching and Control Center

A fault diagnosis model using an Imperialistic Competitive Algorithm(ICA) and SVM integrated approach was established in the *** was applied to search and obtain the parameters of ***,cross validation and normalizations were applied in the training processes of SVM,and the trained SVM model with the selected parameters was established to conduct fault *** results demonstrate that the proposed approach promotes the fault diagnosis accuracy of transformers.

关键词： power transformer fault diagnosis Support Vector Machine(SVM) Imperialistic Competitive Algorithm(ICA) DGA

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Coordinated control strategy of air-conditioning loads for power system balancing

Coordinated control strategy of air-conditioning loads for p...

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International Conference on power System Technology (powerCON)

作者： Meng Liu Zhongkang Wei Xiaodong Chu Wen Zhang Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education (Shandong University) Jinan China State Grid Jibei Electric Power Company Beijing China

In this paper a coordinated control strategy of air-conditioning load groups is proposed to help correct imbalances between load and generation, especially when the power system is under stressed conditions such as the loss of power generation. Firstly, a decentralized air-conditioning load group control strategy (control mode 1) is presented accounting for maintenance of load diversity, so that the large oscillations of aggregated power of load group caused by diversity loss can be avoided. However, there is an unwanted parasitic "power peak" in the control mode 1. To eliminate the negative effects of the "power peak", another load control strategy (control mode 2) is borrowed from the literature which requires to communicate with the control center. Both of the control modes 1 and 2 adopt a segmental load recovery scheme to avoid "recovery peak". Then, a coordinated load control strategy is presented to coordinate the control modes 1 and 2. The "power peak" in control mode 1 is used as the power control objective for the load group of the control mode 2, and the control signal for control mode 2 can be calculated using the dichotomy method. Simulation results verify the effectiveness of the proposed coordinated control strategy of air-conditioning loads for power system balancing.

关键词： Load flow control Temperature control power systems Load modeling Frequency control Atmospheric modeling Oscillators

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