stability modeling of storage devices in facts applications

VELAGAPUDI RAMAKRISHNA SIDDHARTHA ENGINEERING COLLEGEDEPARTMENT OF ELECTRICAL ELECTRONICS ENGINEERING

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Stability Modeling Of Storage DevicesIn FACTS Applications

Term paper report on

SIVA MALA. KUPPA DEPARTMENT OF EEEVR SIDDHARTHA ENGINEERING COLLEGE ANDHRAPRADESH,INDIA

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Index

Abstract

Need for the storage devices.

Super conducting magnetic energy storage.

Steady state models.

State of operation.

Static VAR compensators.


Abstract

Modeling of the storage devices for better stability.

Storage devices applied in the FACTS is

» Superconducting Magnetic Energy Storage (SMES)

» Battery Energy Storage System (BESS).

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These are often considered as FACTS applications.


Need For Storage Devices:

Actually FACTS controllers are capable for the

improving voltage,

small signal,

Transient, stability margins of the system.

In order to improve the additional controllability , storage devices

introduced into the system.

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SMES was originally proposed as a bulk of energy storage device

For electrical power systems.

power conversion is achieved by the two power electronics topologies.

the VSC and the DC –DC chopper share a common DC bus.

The coil can be configured as the solenoid that producers fairly large

fringe fields

Super conducting magnetic energy storage devices


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Steady state models


Steady-state models are used in power flow and voltage stability

studies.

The models keep the desired real and reactive power injections

subject to the nominal current capability of the interface VSC

In case of series VSC, the inserted voltage must be within its nominal

magnitude capability, as well.

The desired real power injection in steady state is normally zero,

implying that no special consideration is required for the storage

devices to be within their capabilities.

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Steady state models


State of operation

responses are quite fast with respect to electro-mechanical

phenomena (i.e., up to a few Hz)

the power electronic equipments are generally modeled as quasi

steady-state interfaces.

augmented by dynamic control models with varying degrees of

details.

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Static VAR compensators and static synchronous compensators are

static VAR generators whose output is varied , so as to maintain our

control specific maintain parameters systems of the electrical power

systems.

SVC system of thyristor controlled reactor (TCR) type is mainly

composed of filter (capacitor) branch and TCR branch, including

thyristor valves, control and protection system, cooling system,

TCR reactor and other equipments

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Static VAR Compensator


Description of STATCOM

There can be a little active power exchange between the STATCOM and the

EPS.

The exchange between the inverter and the AC system can be controlled

adjusting the output voltage angle from the inverter to the voltage angle of the

AC system.

This means that the inverter can not provide active power to the AC system

form the DC accumulated energy if the output voltage of the inverter goes

before the voltage of the AC system.

On the other hand, the inverter can absorb the active power of the AC system

if its voltage is delayed in respect to the AC system voltage

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STATCOM


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Dynamic Model of Super conducting Inductor


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Dynamic Model of Battery


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[1]Saeed Arabl, “A SMES model for comprehenswe power system stabditystudies,” EPRt Conference - The Future of Power Delivery in the 2 ls’Century, San Diego, November 18-20, 1997, TR-109806, Final Report,May 1998, pp. 4-95 to 4-109

[2]H.J Boenig, and J F. Hacrer, “Commissioning Tests of the BonnevillePower Administration 30 MJ Superconducting Magnehc Energy StorageUnit,” IEEE Trans. Power Apparatus and Systems, VOI PAS-104, no. 2,February 1985, pp 302-308

[3] Y. N. Yu, Electric Power System Dynamics. Academic Press, 1983.

References


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stability modeling of storage devices in facts applications

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