Study of Aggregate Models for Squirrel-Cage Induction Motors

Pedra, J.; Sainz, L.; Córcoles, F.

doi:10.1109/tpwrs.2005.852073

Cited by 23 publications

(7 citation statements)

References 11 publications

(5 reference statements)

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“…To reduce the system simulation processing time, the model of aggregate motors is used for each side (A and B) of each bus, without loss of generality [29]. As a result, the aggregated motor is represented by a single induction motor with the same dynamic response as the system with individual motors.…”

Section: The Power System Of the Oil And Gas Platform With Wind Power...mentioning

confidence: 99%

Coordinated Decentralized Control of Dynamic Volt-Var Function in Oil and Gas Platform With Wind Power Generation

da Rocha,

Brandao,

Medeiros

et al. 2023

IEEE Open J. Ind. Applicat.

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The integration of offshore wind energy power system is a solution to reduce carbon emissions in the oil and gas sector. However, the intermittent profile of wind power generation can bring challenges of voltage/frequency fluctuations to the electrical grid of the platform. This paper proposes a coordinated decentralized control used to mitigate voltage fluctuation in oil and gas platform caused by connection of wind power system through short-and long-umbilical cables. The proposed control is split into optimum loss control embedded in the wind power system control, and modified dynamic volt-var functions applied to active front-end variable frequency drives. The decentralized control is evaluated by means of simulation results considering a real case test bench of a typical Brazilian offshore platform with a wind power system of 10 MW and 50 MW, and umbilical cable of 12 km and 150 km. The results indicate an effective contribution of the dynamic volt-var function in reducing voltage fluctuations for the three implemented wind power system configurations (i.e., 10 MW/12 km; 50 MW/12 km and 50 MW/150 km).INDEX TERMS Coordinated control, offshore wind, O&G platform, voltage fluctuations, volt-var function.

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Section: The Power System Of the Oil And Gas Platform With Wind Power...mentioning

confidence: 99%

Coordinated Decentralized Control of Dynamic Volt-Var Function in Oil and Gas Platform With Wind Power Generation

da Rocha,

Brandao,

Medeiros

et al. 2023

IEEE Open J. Ind. Applicat.

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“…This effect in combination with the second cage that has low resistance under low slip conditions, creates an accurate torque-speed profile. Reference [78] has shown that double-cage model better predicts starting current and torque manufacturer data. Therefore, the double-cage modeling is adopted in this thesis.…”

Section: Emtp Model Of Three-phase Induction Motorsmentioning

confidence: 99%

Detailed EMT-type Load Modeling for Power System Dynamic and Harmonic Studies

Milani,

Khodabakhchian,

Mahseredjian

2023

2023 IEEE Power &Amp; Energy Society General Meeting (PESGM)

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Steady-state and dynamic performance of power systems are strongly influenced by the characteristics of the supplied loads. Therefore, correct analysis of power systems requires appropriate load models. As the majority of existing load models do not allow for a full or precise representation of the real aggregated loads, it is essential to develop accurate load models in order to capture load behavior more accurately. In this thesis a new detailed EMT-type (electromagnetic transient) component-based load model is developed in the time-domain simulation tool, EMTP® (Electromagnetic Transients Program). Individual EMT-type models of components from various load categories are first developed and next aggregated to form an aggregated detailed load model. The proposed model captures the diversity in end-use devices of real aggregated loads and is also capable of accounting for nonlinearities (i.e., power electronics), single-phase loads and unbalanced conditions (e.g., asymmetrical faults). It offers higher accuracy and can provide a more realistic description of the load behaviour compared to the existing models. The developed model is used to simulate load behavior in voltage sag events in different load sectors and is validated against field data. Validation of the model in real cases is an important stage of load model development which is required to ensure the capability of the proposed model to reproduce the dynamic behavior of loads during and following disturbances.Detailed load modeling is not usually the preferred approach mainly due to excessive data requirements, modeling efforts and computational burden. However, the importance of the detailed model for capturing load behaviour in dynamic simulations is investigated and its advantage over traditional models is highlighted.To explore a different aspect of load modeling, the frequency response of the load is studied through the simulation of an existing underground distribution network. The importance of the detailed model for capturing load behaviour in harmonic simulations is investigated and errors caused by conventional models are introduced. As an extension to this part, some new guidelines regarding modeling underground distribution systems for harmonic simulations of power systems is provided. viii

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“…Load lumping of high-inertia loads, as described in [3] and [4], is an important technique that causes a model to more accurately depict real field conditions with limited model complexity. The authors recommend modeling approximately 90 percent of the system inertia or above for frequency stability analysis.…”

Section: Application Of Inertiamentioning

confidence: 99%

Load modeling assumptions: What is accurate enough?

Khatib¹,

Appannagari²,

Manson³

et al. 2015

2015 IEEE Petroleum and Chemical Industry Committee Conference (PCIC)

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This paper presents an elegant method for determining the simplest model of a power system electrical/mechanical load that will suffice for dynamic frequency power system studies and closed-loop simulation work. The strategy behind this technique is to supply the simplest load model possible that gives sufficiently accurate results for the goals of each unique modeling effort.The paper identifies the frequency characteristics of several different load types. It also identifies the level of load model detail required for testing typical power management systems, contingency-based load-shedding systems, frequency-based load-shedding systems, governor control systems, island/grid/unit autosynchronization systems, and exciter control systems.The paper describes how to lump loads without loss of fidelity, when an induction motor needs to be modeled as a single-cage or double-cage motor model, what sort of mechanical load model is appropriate, when we can assume zero inertia for a direct-on-line type of load, and how to verify the turbine/generator inertia and load inertia from field tests.This paper concludes with a simple reference that engineers can use to specify the level of detail required when modeling industrial power system loads.

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Study of Aggregate Models for Squirrel-Cage Induction Motors

Cited by 23 publications

References 11 publications

Coordinated Decentralized Control of Dynamic Volt-Var Function in Oil and Gas Platform With Wind Power Generation

Coordinated Decentralized Control of Dynamic Volt-Var Function in Oil and Gas Platform With Wind Power Generation

Detailed EMT-type Load Modeling for Power System Dynamic and Harmonic Studies

Load modeling assumptions: What is accurate enough?

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