Experimental Analysis of Stability and Power Limitations

Evans, R. D.; Bergvall, R. C.

doi:10.1109/t-aiee.1924.5060968

Cited by 34 publications

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“…), a very restrictive scenario. 1 In a real network, where generators have different power ratings, it is natural for parameters to scale accordingly: for instance, the inertia m i of a machine will grow with its rating, and it is clear that "heavier" machines will have a more significant impact in the overall dynamics.…”

Section: A a Family Of Heterogeneous Machinesmentioning

confidence: 99%

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Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia

Paganini

Mallada

2017

2017 55th Annual Allerton Conference on Communication, Control, and Computing (Allerton)

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A recent trend in control of power systems has sought to quantify the synchronization dynamics in terms of a global performance metric, compute it under very simplified assumptions, and use it to gain insight on the role of system parameters, in particular, inertia. In this paper, we wish to extend this approach to more realistic scenarios, by incorporating the heterogeneity of machine ratings, more complete machine models, and also to more closely map it to classical power engineering notions such as Nadir, Rate of Change of Frequency (RoCoF), and inter-area oscillations.We consider the system response to a step change in power excitation, and define the system frequency as a weighted average of generator frequencies (with weights proportional to each machine's rating); we characterize Nadir and RoCoF by the L∞ norm of the system frequency and its derivative, respectively, and inter-areas oscillations by the L2 norm of the error of the vector of bus frequencies w.r.t. the system frequency.For machine models where the dynamic parameters (inertia, damping, etc.) are proportional to rating, we analytically compute these norms and use them to show that the role of inertia is more nuanced than in the conventional wisdom. With the classical swing dynamics, inertia constant plays a secondary role in performance. It is only when the turbine dynamics are introduced that the benefits of inertia become more prominent.

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Section: A a Family Of Heterogeneous Machinesmentioning

confidence: 99%

“…The synchronization performance of the power grid has been a major concern of system operators since the early days [1], [2]. Most generators and loads are designed on the assumption that the grid frequency is tightly regulated around a nominal value (e.g.…”

Section: Introductionmentioning

confidence: 99%

Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia

Paganini

Mallada

2017

2017 55th Annual Allerton Conference on Communication, Control, and Computing (Allerton)

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“…The NSF/DOE Engineering Research Center, CURENT, at The University of Tennessee has developed a one-of-a-kind control, modeling, visualization, and test platform for novel power system control and new utility devices before their actual deployment to the grid [1]. 1 Early real-time grid emulators trace back to the 1920s [2], [3]. Analog-based grid emulators such as miniature systems and the transient network analyzer were used to investigate power flow, stability, and oscillation issues in power grids.…”

Section: A Backgroundmentioning

confidence: 99%

Reconfigurable Real-Time Power Grid Emulator for Systems With High Penetration of Renewables

Tolbert

Wang

Tomsovic

et al. 2020

IEEE Open J. Power Energy

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Novel power system control and new utility devices need to be tested before their actual deployment to the power grid. To assist with such a testing need, real-time digital emulators such as RTDS and Opal-RT can be used to connect to the physical world and form a hardware in the loop (HIL) emulation. However, due to the limitations of today's computational resources, the accuracy and fidelity suffer from different levels of model reductions in purely digital simulations. CURENT has developed a reconfigurable electric grid hardware testbed (HTB) to overcome the limitations of digital emulators. The HTB has been used to develop measurement, control, modeling, and actuation techniques for a national grid with a high penetration of renewables. The power electronic-based system includes emulators for synchronous generators; photovoltaics with gridinterfacing inverter; wind turbines; induction motor loads, ZIP loads, power electronic loads; batteries; ac and dc transmission lines; short circuit faults and grid relay protection; and a multiterminal HVDC overlay including power electronics interfaces. The system contains real elements of power flow, measurement, communication, protection, and control that mimic what would be seen in an actual electric grid. This paper presents an overview of the HTB and several scenarios that have been run to determine control and actions needed for the future power grid.

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“…The use of damper windings in electrical machines has been a topic of discussion since the 1920s [11] [12]. The most common application of damper windings is in synchronous machines where they are placed in the rotor to aid starting and to damp out oscillations.…”

Section: Passive Damper Windingsmentioning

confidence: 99%

Reducing bearing wear in induction generators for wave and tidal current energy devices

Shek¹,

Dorrell²,

Hsieh³

et al. 2011

IET Conference on Renewable Power Generation (RPG 2011)

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Marine energy devices such as wave energy converters and tidal current turbines are set to play a significant role in contributing to electricity generating by renewable means. The offshore location where these devices operate demands high reliability and robust fault tolerance. Bearing failure is a key issue for renewable energy devices and is a cause of significant downtime in wind turbines. Bearing wear is accelerated due to unbalanced magnetic pull in the rotor of an electrical generator. This paper presents a review and assessment of methods to reduce bearing wear through both machine design and active control through power electronics.

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Experimental Analysis of Stability and Power Limitations

Cited by 34 publications

References 0 publications

Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia

Global performance metrics for synchronization of heterogeneously rated power systems: The role of machine models and inertia

Reconfigurable Real-Time Power Grid Emulator for Systems With High Penetration of Renewables

Reducing bearing wear in induction generators for wave and tidal current energy devices

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