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检索条件"任意字段=IREP Symposium - Bulk Power System Dynamics and Control"

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Stability Assessment of a system Comprising a Single Machine and Inverter with Scalable Ratings

Stability Assessment of a System Comprising a Single Machine...

引用

North American power symposium (NAPS)

作者： Lin, Yashen Johnson, Brian Gevorgian, Vahan Purba, Victor Dhople, Sairaj Natl Renewable Energy Lab Power Syst Engn Ctr Golden CO 80401 USA Univ Minnesota Dept Elect & Comp Engn Minneapolis MN 55455 USA

ISBN: (纸本)9781538626993

Synchronous machines have traditionally acted as the foundation of large-scale electrical infrastructures and their physical properties have formed the cornerstone of system operations. However, with the increased integration of distributed renewable resources and energy-storage technologies, there is a need to systematically acknowledge the dynamics of power-electronics inverters-the primary energy-conversion interface in such systems-in all aspects of modeling, analysis, and control of the bulk power network. In this paper, we assess the properties of coupled machine-inverter systems by studying an elementary system comprised of a synchronous generator, three-phase inverter, and a load. The inverter model is formulated such that its power rating can be scaled continuously across power levels while preserving its closed-loop response. Accordingly, the properties of the machine-inverter system can be assessed for varying ratios of machine-to-inverter power ratings. After linearizing the model and assessing its eigenvalues, we show that system stability is highly dependent on the inverter current controller and machine exciter, thus uncovering a key concern with mixed machine-inverter systems and motivating the need for next-generation grid-stabilizing inverter controls.

关键词： Inverters Phase locked loops Voltage control power system stability Stability analysis power system dynamics Analytical models

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DYNAMIC MODEL OF A NOVEL ALTERNATING FLOW (AF) HYDRAULIC PUMP

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ASME/BATH 2017 symposium on Fluid power and Motion control (FPMC2017)

作者： Li, Mengtang M. Foss, Ryan Stetson, Kim A. Van de Ven, James D. Barth, Eric J. Vanderbilt Univ Dept Mech Engn 2301 Vanderbilt Pl Nashville TN 37235 USA Univ Minnesota Dept Mech Engn 111 Church St SE Minneapolis MN 55455 USA

ISBN: (纸本)9780791858332

High power density and good controllability are the most appealing characteristics that make hydraulic systems the best choice for many applications. Current state of the art hydraulic variable displacement pumps show high efficiency at high displacement while they have poor efficiencies at low displacement. This paper proposes a novel alternating flow (AF) variable displacement hydraulic pump to 1) eliminate metering losses by acting as a high-bandwidth pump for displacement control, 2) achieve high efficiency across a wide range of operating conditions and displacements, and 3) allow multiple units to be easily common-shaft mounted for a compact multi actuator displacement control system from a single prime-mover. A dynamic model using first principles describes the cylinder pressure, flows between pairs of cylinders, and net inlet and outlet flows as a function of the pump's phase shift angle. The model captures hydraulic check valve dynamics, the effective bulk modulus, leakage flows, and viscous friction. Piston kinematics and dynamics are discussed and energy loss models are presented and used to guide the design for a first prototype of the AF hydraulic pump. The paper presents simulation results from the model that offer an initial evaluation of this novel pump concept and potential applications.

关键词： Flow (dynamics) Hydraulic pumps Dynamic models

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2010 irep symposium - bulk power system dynamics and control - VIII, irep2010

2010 IREP Symposium - Bulk Power System Dynamics and Control...

引用

2010 irep symposium - bulk power system dynamics and control - VIII, irep2010

ISBN: (纸本)9781424474677

The proceedings contain 62 papers. The topics discussed include: secondary and tertiary voltage regulation based on optimal power flows;a probabilistic distance to the power system secure operation boundary;coordination of intermittent generation with storage, demand control and conventional energy sources;probabilistic wind energy modeling for electric generation system reliability assessment;a new method for direct computation of critical clearing time for transient stability analysis;parallel genetic algorithm to tune multiple power system stabilizers in large interconnected power systems;network-driven dynamic congestion based on mutually orthogonal LMP decomposition;resource-adequacy-based capacity market design;the integration of PHEV aggregations into a power system with wind resources;power system stability increase by secondary voltage regulation applied to the South Africa transmission grid;and on the assessment of voltage ride-through needs of the power transmission grid.

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EXPERIMENTAL INVESTIGATION ON EFFECTIVE bulk MODULUS AND EFFECTIVE VOLUME IN AN EXTERNAL GEAR PUMP

引用

BATH/ASME 2016 symposium on Fluid power and Motion control

作者： Nakagawa, Shuichi Ichiyanagi, Takayoshi Nishiumi, Takao Yanmar Co Ltd Ctr Res & Dev Res Ctr 2481 Umegahara Maibara Shiga Japan Natl Def Acad Dept Mech Syst Engn 1-10-20 Hashirimizu Yokosuka Kanagawa Japan

ISBN: (纸本)9780791850060

Pressure ripples generated by a positive displacement pump in a hydraulic system can lead to severe noise and vibration problems. The source impedance of a positive displacement pump has a considerable impact on the generation of pressure ripples. It is, therefore, important to be able to predict the source impedance in order to design quiet hydraulic systems. The source impedance of a positive displacement pump depends, amongst other things, on bulk modulus and volume. However, it is known that the mathematical model that takes into account the bulk modulus of hydraulic oil and the volume of a discharge room in the pump results in an estimated value of the source impedance that is greater than the measured value. In this study, the factors which affect the source impedance of an external gear pump for an agricultural tractor have been investigated. In particular, the effect of the following factors has been investigated experimentally: the effective bulk modulus as determined by the components of the pump: leakage in the pump: the specific volume ratio of entrained air to hydraulic oil: and the volume of the tooth space of the pump. In addition, the effect of volumetric change of the discharge room by pumping action has been investigated using CFD with moving mesh technique.

关键词： Air entrainment Vibration Pressure Noise (Sound) Gear pumps Leakage Hydraulic drive systems bulk modulus Pumps Design Vacuum pumps Computational fluid dynamics

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DEVELOPED MEASURING METHODS FOR HYDRAULIC FLUID dynamics AND VISCOSITY AT EXTREME PRESSURES AND TEMPERATURES

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ASME/BATH 2014 symposium on Fluid power and Motion control

作者： Karjalainen, J-P Karjalainen, R. Huhtala, K. Tampere Univ Technol Dept Intelligent Hydraul & Automat IHA FIN-33101 Tampere Finland

ISBN: (纸本)9780791845974

Hydraulic fluid is one of the most important components in every fluid power system. Therefore, fluid properties have to be known with a good accuracy in an increasing number of applications, for example in system's design, modelling and control. The fluid of interest may be a power transmission fluid as well as a fuel. In defining the needed fluid characteristics, the large variety of different fluid types sets many demands for a single measuring system. Moreover, known fluid properties, of fuels in particular, are needed at constantly higher pressures and temperatures, raising the bar for practical measuring concepts user-friendliness, safety and equipment cost are also essential criteria. In this paper, two accurate, but rather simple and affordable measuring concepts are presented. The speed of sound in a fluid, hydraulic fluid density and adiabatic tangent fluid bulk modulus are all defined with a direct measurement of the pressure wave propagation. The dynamic and kinematic fluid viscosities are defined with a remotely operated, modified falling ball viscometer. Both the presented methods have been developed further from the previously published concepts of the same authors. With these improved systems, all the mentioned fluid parameters can reliably be measured at up to at least 2,500 bar and at up to at least +150 degrees C. Moreover, the same equipment can be applied to any type of hydraulic fluid, a fuel or a power transmission fluid, regardless of the base fluid, additives or viscosity grade. In addition to presenting the measuring concepts and the equipment used in detail, a selected sample of experimental results will also be presented to demonstrate the performance characteristics of the methods.

关键词： Fluid dynamics Temperature Viscosity

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Discussion on uncertainty management in power systems

Discussion on uncertainty management in power systems

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2013 irep symposium on bulk power system dynamics and control - IX Optimization, Security and control of the Emerging power Grid, irep 2013

作者： Mousavi, Omid Alizadeh Cherkaoui, Rachid Switzerland

ISBN: (纸本)9781479901999

关键词： Monte Carlo methods computational complexity power grids power system management power system planning stochastic programming

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Oral discussions on session: 'Advanced Operations' - Part II

Oral discussions on session: 'Advanced Operations' - Part II

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2013 irep symposium - bulk power system dynamics and control - IX Optimization, Security and control of the Emerging power Grid Supplement, irep Supplement 2013

作者： Gross, George University of Illinois at Urbana-Champaign United States

This paper contains the second part of the transcribed oral discussions of Session 'Advanced Operations' of the 2013 irep symposium-bulk power system dynamics and control, held on Thursday morning, August 29, ... 详细信息

ISBN: (纸本)9781479938889

关键词： system theory

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Oral discussions on session: 'Advanced Operations' - Part i

Oral discussions on session: 'Advanced Operations' - Part i

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2013 irep symposium - bulk power system dynamics and control - IX Optimization, Security and control of the Emerging power Grid Supplement, irep Supplement 2013

作者： Gross, George University of Illinois at Urbana-Champaign United States

This paper contains the first part of the transcribed oral discussions of Session 'Advanced Operations' of the 2013 irep symposium-bulk power system dynamics and control, held on Thursday morning, August 29, 2... 详细信息

ISBN: (纸本)9781479938889

关键词： system theory

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Oral discussions on session: 'Synchrophasor Applications' - Part i

Oral discussions on session: 'Synchrophasor Applications' - ...

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2013 irep symposium - bulk power system dynamics and control - IX Optimization, Security and control of the Emerging power Grid Supplement, irep Supplement 2013

作者： Yorino, Naoto Hiroshima University Japan

This paper contains the first part of the transcribed oral discussions of Session 'Synchrophasor Applications' of the 2013 irep symposium-bulk power system dynamics and control, held on Tuesday afternoon, Augu... 详细信息

ISBN: (纸本)9781479938889

关键词： system theory

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Oral discussions on session: 'Optimization and DSM' - Part i

Oral discussions on session: 'Optimization and DSM' - Part i

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2013 irep symposium - bulk power system dynamics and control - IX Optimization, Security and control of the Emerging power Grid Supplement, irep Supplement 2013

作者： Alvarado, Fernando

ISBN: (纸本)9781479938889

This paper contains the first part of the transcribed oral discussions of Session 'Optimization and Demand Side Management' of the 2013 irep symposium-bulk power system dynamics and control symposium, held on Wednesday afternoon, August 28, 2013. Papers [1], [2] and [4] were presented by authors. Paper [3] was presented by Guanqun Wang of Washington State University. © 2013 IEEE.

关键词： system theory

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