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Frequency aware robust economic dispatch

Journal of Modern power systems and Clean Energy 2016年第2期4卷 200-210页

作者： Donglei SUN Xueshan HAN Bo ZHANG Mingqiang WANG Tianyu DING Key Laboratory of Power System Intelligent Dispatch and Control of Ministry of Education Shandong UniversityJinan 250061China Department of Electrical and Computer Engineering University of AlbertaEdmontonAB T6G 2G7Canada

This paper proposes a novel frequency aware robust economic dispatch (FARED) approach to exploit the synergistic capability of accommodating uncertain loads and renewable generation by accounting for both the frequency regulation effect and optimal participation mechanism of secondary regulation reserves for conventional units in response to uncertainties in the robust optimization counterpart of security constrained economic *** FARED is formulated as a robust optimization *** this formulation the allowable frequency deviation and the possible load or renewable generation curtailments are expressed in terms of variable uncertainty *** variables in the formulation are described as interval variables and treated in affine *** order to improve the computational tractability,the dominant constraints which canbe the candidates of tight transmission constraints are determined by complementarity *** the robust optimization problem is simplified to a bilinear programming problem based on duality ***,the effectiveness and efficiency of the proposed method are illustrated based on several study cases.

关键词： Economic dispatch Frequency regulation effect Interval uncertainty Robust optimization Affine policy Complementarity constraints

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Global Stabilization of a Chain of Integrators by a Switching Event-Triggered Bounded Control

Global Stabilization of a Chain of Integrators by a Switchin...

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American Control Conference

作者： Yijing Xie Zongli Lin Department of Automation and Key Laboratory of System Control and Information Processing of the Ministry of Education Shanghai Jiao Tong University Shanghai 200240 China Charles L. Brown Department of Electrical and Computer Engineering University of Virginia Charlottesville VA 22904-4743 USA

ISBN: (纸本)9781509045839

This paper studies the problem of global stabilization of multiple integrator systems using event-triggered bounded controls. The linear system is described by a chain of integrators of arbitrary length n. A switching event-triggered bounded control law is constructed. This control law switches among a sequence of n event-triggered control laws. A switching strategy is designed for the selection of an individual event-triggered control law and an event-triggering strategy is designed for updating the control value of each of these control laws. This switching event-triggered control law is shown to achieve global asymptotic stabilization. The absence of the Zeno behavior is also established. Simulation results are given to illustrate the theoretical results.

关键词： Event-triggered control bounded control global stabilization bounded control Event trigger control law integrators Chains linearly ordered set switching

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Advanced multilevel converter applied to an open-ends induction machine: Analysis, implementation and loss evaluation

Advanced multilevel converter applied to an open-ends induct...

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2017 IEEE International Electric Machines and Drives Conference, IEMDC 2017

作者： Salem, A. Belie, F.D. Yousef, T. Melkebeek, J. Mohamed, O.A. Abido, M.A. Electrical Engineering Department King Fahd University for Petroleum and Menials Dhahran Saudi Arabia Dept. of Electrical Power and Machines Helwan University Cairo Egypt Dept. of Electrical Energy System and Automation Ghent University Gent Belgium Dept. of Energy Systems Research Laboratory ECE Department Florida International University MiamiFL United States

ISBN: (纸本)9781509042814

This paper studies the performance of the dual 3-level T-Type converter topology, as an advanced 5-level converter, applied to an open-ends induction machine. The performance is evaluated based on harmonic analysis, converter power loss and the steady-state machine performance. An advanced technique based on space-vector pulse-width modulation is proposed to reduce the converter switching stress as well as switching losses. A simulation based on a Matlab/Simulink program for the proposed topology as well as for some conventional multilevel converter topologies is performed. A practical implementation, based on a field-programmable gate array, for the proposed topology is presented, discussed and analyzed. A comparison between experimental and simulation results is conducted. The results show that the advanced topology reduces the harmonic content, the machine torque ripple, and the overall drive losses compared to three-level converters. Also, the proposed topology and the proposed switching technique reduce the converter losses by 40% compared to conventional five-level diode clamped converter. © 2017 IEEE.

关键词： Topology

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Research on influence between photovoltaic power and module temperature and ambient temperature

Research on influence between photovoltaic power and module ...

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2016 IEEE International Conference on power system Technology, powerCON 2016

作者： Wang, Bo Wang, Zheng Sun, Yujing Wang, Fei Zhen, Zhao Zengqiang, Mi Ren, Hui Beijing China State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Baoding China Department of Electrical and Computer Engineering University of Illinois at Urbana-Champaign Urbana United States

ISBN: (纸本)9781467388481

The photovoltaic (PV) module temperature (Tm) and ambient temperature (Ta) are both important factors to PV power output (P), but are often confused with each other or even ignored. In this paper, the physical analysis methods and mathematical analysis methods are utilized to research the differences and similarities of two temperatures in effecting of PV power output. Firstly, based on PV effect theory, energy balance equation and heat transfer theory, the relationship between three variables is analyzed in physical. Secondly, in mathematical aspect, correlation coefficient and information entropy are utilized to analyze the correlation between Tm and P as well as Ta and P in the whole year and four kinds of weather types based on actual data of a grid-connected 500kW PV system. The results indicate that, other things equal, Tm is a more direct and stronger factor than Ta. © 2016 IEEE.

关键词： Temperature

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Vector and power synchronization control for connecting a VSCMTDC to an AC power system-a comparative study of dynamic interactions between the DC and AC network based on PSCAD simulation 12

Vector and Power synchronization control for connecting a VS...

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12th IET International Conference on AC and DC power Transmission, ACDC 2016

作者： Fu, Q. Du, W. Chen, Chen Wang, H.F. Fan, L.L. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China Department of Electrical and Computer Engineering North Dakota State University FargoND51805 United States

ISBN: (纸本)9781785612268

In this paper, a comparative study of the impacts of two VSC control strategies which are vector control and powersynchronization control strategy on the dynamic interactions between the AC and DC network is conducted. Firstly, a hybrid AC/DC system model which consists of synchronous generators and a VSC MTDC grid is established in the PSCAD. Moreover, based on the established system model, the dynamic interactions between the AC and DC network with two different control strategies under different contingencies such as AC side fault, DC side fault and system frequency fluctuation are examined carefully. Furthermore, under the AC fault condition, the effects of several different influencing factors such as MTDC integration, power exchange, the connection strength and VSC control parameters on the electromechanical transient process of the hybrid system are investigated.

关键词： Hybrid systems

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Sensorless current model predictive control for maximum power point tracking of single-phase subMultilevel inverter for photovoltaic systems

Sensorless current model predictive control for maximum powe...

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2016 IEEE Energy Conversion Congress and Exposition, ECCE 2016

作者： Metry, Morcos Bayhan, Sertac Shadmand, Mohammad B. Balog, Robert S. Rub, Haitham Abu Renewable Energy and Advanced Power Electronics Research Laboratory Department of Electrical and Computer Engineering Texas AandM University College StationTX77843 United States Electrical and Computer Engineering Program Texas AandM University at Qatar Qatar Foundation Doha23874 Qatar Department of Electronics and Automation Gazi University Ankara Turkey

ISBN: (纸本)9781509007370

Stochastic dynamic behavior of solar energy necessitates the use of robust controllers for photovoltaic (PV) power electronics interfaces to maximize the energy harvest by continuous operation at maximum power point (MPP). This paper proposes a sensorless current model predictive control maximum power point tracking (SC-MPC-MPPT) algorithm. By predicting the future behavior of the power conversion stage, the proposed controller features fast and stable performance under dynamic ambient condition and negligible oscillation around MPP at steady state. Moreover, it does not require expensive sensing and communication equipment and networks to directly measure the changing solar insolation level. The power conversion stage includes an upstream boost dc/dc power conversion to a dc-link capacitor, and a downstream seven-level sub-Multilevel Inverter (sMI) from the dc-link capacitor to the grid. The sMI is using three power arms cascaded with an H-bridge inverter. This topology brings considerable benefits such as reduced number of power switches and their gate drivers when compared to the traditional multilevel inverters. Model Predictive Control (MPC) is employed for current regulation of the sMI, thus eliminating the need of cascaded classical control loops and modulator. The proposed SC-MPC-MPPT technique for a boost converter is implemented experimentally using the dSPACE DS1007 platform. © 2016 IEEE.

关键词： Model predictive control

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Control interactions between the HVDC and UPFC by use of the RGA 12

Control interactions between the HVDC and UPFC by use of the...

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12th IET International Conference on AC and DC power Transmission, ACDC 2016

作者： Wang, X.F. Yang, L. Du, W.J. Wang, H.F. Fan, L.L. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources Orth China Electric Power University Beijing102206 China State Gird Jiangsu Electric Power Company Nanjing210008 China Department of Electrical and Computer Engineering North Dakota State University FargoND58105 United States

ISBN: (纸本)9781785612268

High Voltage Direct Current (HVDC) for power transmission and Unified power Flow Controller (UPFC) for power flow regulation are important elements in a modern AC/DC power system. HVDC technology has been applied in real power systems for decades due to its distinct advantages in the aspect of long-distance and large-capability power transmission. While applications of the UPFC is still limited and potential problems of its implementation in real power system have not been investigated extensively and reported from the engineering practice. This paper reviewed the study of the dynamic interactions on HVDC and UPFC. Firstly in the paper, HVDC and UPFC technology is briefly reviewed and potential problem on their interactions is introduced. Secondly, two main methods of normal form and relative gain analysis (RGA) were introduced for the study of dynamic interactions. Finally, the paper summarized the existing research results and proposed further research directions that studying interactions between the HVDC and UPFC control functions by using the method of RGA.

关键词： Electric load flow

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Damping torque comparison and analysis of UPFC based on phase angle control and vector control 12

Damping torque comparison and analysis of UPFC based on phas...

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12th IET International Conference on AC and DC power Transmission, ACDC 2016

作者： Zhang, J.P. Wang, X. Du, W.J. Wang, H.F. Fan, L.L. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China State Grid Jiangsu Electric Power Company Nanjing210024 China Department of Electrical and Computer Engineering North Dakota State University FargoND58105 United States

ISBN: (纸本)9781785612268

This paper conducts an in-depth study on the damping characteristics of the damping controller added on the UPFC when two different control strategies are applied (vector control strategy and phase angle control strategy). Firstly, the structure of the UPFC and the principle of the vector and phase angle control strategy are presented in this paper. Then the linearized model of the system with a UPFC installed is established. Based on the model, the damping torque analysis (DTA) method is introduced and then applied to analyze the damping effect of the additional damping controller to the inter-area oscillation mode in the two area four machine system with a UPFC installed. It is found that the damping provided by the damping controller added on the UPFC with the phase angle control strategy is larger than that provided when the vector control strategy is applied. The correctness of the analytical conclusions are verified by both the modal analysis method and the time domain simulation where the phase compensation method is used to design a damping controller.

关键词： Modal analysis

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Analysis of power flow control capability of a unified power flow controller to be installed in a real Chinese power network 12

Analysis of power flow control capability of a unified power...

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12th IET International Conference on AC and DC power Transmission, ACDC 2016

作者： Ren, B.X. Cai, H. Du, W.J. Wang, H.F. Fan, L.L. State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources North China Electric Power University Beijing102206 China State Grid Jiangsu Economic Research Institute Nanjing210008 China Department of Electrical and Computer Engineering North Dakota State University FargoND51805 United States

ISBN: (纸本)9781785612268

The first UPFC of China is to be installed in the 220kV power network and is planned to be in full operation at the end of 2015. This UPFC is expected to increase the transmission line capability and reduce transmission loss by regulating line active and reactive power flow, so as to meet the demand of growing load. This paper caries out a comprehensive investigation on the power flow control capability of the UPFC to be installed in the actual power network. First of all, the power flow control region of the UPFC is worked out by using the actual operational data of the power network. Secondly, from the results of power flow calculation with the UPFC being installed, it is demonstrated how much the UPFC can enhance the power transfer capacity and balance the power flow distribution of the power network. Potential of installing the UPFC to meet the growing demand of the load is discussed. Finally, the power system optimal power flow (OPF) with the UPFC being included is carried out to show the influence of UPFC power flow control region on the results of OPF.

关键词： Electric load flow

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On the quantification of the dissolved hydroxyl radicals in the plasma-liquid system using the molecular probe method

arXiv

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arXiv 2017年

作者： Ma, Yupengxue Gong, Xinning He, Bangbang Li, Xiaofei Cao, Dianyu Li, Junshuai Xiong, Qing Chen, Qiang Chen, Bing Hui Liu, Qing Huo Fujian Provincial Key Laboratory of Plasma and Magnetic Resonance Institute of Electromagnetics and Acoustics Department of Electronic Science Xiamen University Xiamen361005 China Department of Chemical and Biochemical Engineering National Engineering Laboratory for Green Productions of Alcohols-Ethers-Esters College of Chemistry and Chemical Engineering Xiamen University Xiamen361005 China School of Physical Science and Technology Lanzhou University Lanzhou730000 China State Key Laboratory of Power Transmission Equipment & System Security and New Technology Chongqing University Chongqing400044 China Department of Electrical and Computer Engineering Duke University DurhamNC27708 United States

Hydroxyl (OH) radical is the most important reactive species produced by the plasmaliquid interactions, and the OH in the liquid phase (dissolved OH radical, OHdis) takes effect in many plasma-based applications due to its high reactivity. Therefore, the quantification of the OHdisin the plasma-liquid system is of great importance, and a molecular probe method usually used for the OHdisdetection might be applied. Herein we investigate the validity of using the molecular probe method to estimate the [OHdis] in the plasma-liquid system. Dimethyl sulfoxide is used as the molecular probe to estimate the [OHdis] in an air plasma-liquid system, and the partial OHdisis related to the formed formaldehyde (HCHO) which is the OHdis-induced derivative. The analysis indicates that the true concentration of the OHdisshould be estimated from the sum of three terms: the formed HCHO, the existing OH scavengers, and the OHdisgenerated H2O2. The results show that the measured [HCHO] needs to be corrected since the HCHO destruction is not negligible in the plasma-liquid system. We conclude from the results and the analysis that the molecular probe method generally underestimates the [OHdis] in the plasma-liquid system. If one wants to obtain the true concentration of the OHdisin the plasma-liquid system, one needs to know the destruction behavior of the OHdis-induced derivatives, the information of the OH scavengers (such as hydrated electron, atomic hydrogen besides the molecular probe), and also the knowledge of the OHdisgenerated H2O2. Copyright © 2017, The Authors. All rights reserved.

关键词： Free radicals

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