the impact of statcom on distance relay

8/14/2019 THE IMPACT OF STATCOM ON DISTANCE RELAY

1/15

THE IMPACT OF STATCOMTHE IMPACT OF STATCOM

ON DISTANCE RELAYON DISTANCE RELAY

Under The Esteemed Guidance Of

:Presented by


2/15

ISTANCEPROTECTIONIt is used for the protection of transmission or sub-transmission lines . It includes a no of distance relaysof same or different type.

Types of Distance Relays

Impedance relay /measures line impedance b w fault point.and relay location

Reactance Relay .measures reactnce of transmission line

MHO Relay measures component of admittance


3/15

hat isACTS ?

Benefits of FACTS

Increase the system securityProvide greater flexibilityIncrease the loading

capability &Reduce reactive power flowloop flow

FACT Devices

,Used for power flow control load sharing and.voltage regulation of system oscillations some

,of are

STATCOM ,SSG ,SSSC ,TCVR ,TCVL ,UPFC


4/15

STATCOM-T IS OPERATED AS A SHUNT

OMPENSATED STATIC VAR COMPENSATOR/HOSE CAPACITIVE INDUCTIVE OUTPUT

URRENT CAN BE CONTROLLED INDEPENDENT.F AC SYSTEM VOLTAGE

/It is based on a voltage current sourced.converter

It acts as active filter to absorb.system

Statcom has strong on fluence on load&flow control voltage control over.other devices


5/15

TATCOM MODELThis tool is used to model the 138kV parallel transmission system with 48-

pulse STATCOM installed in the mid-point of one transmission line.It is installed in the middle of the second transmission line.The positive & negative sequence line impedances are 0.195+j3.3425/km

The zero sequence transmission line impedance is 2.638+11.27j.


6/15

-48 pulse voltageinverter

- , -It consists of four 3 phase 3 level GTO

- .inverters and four phase shifting transformers

PPARENT IMPEDANCECALCULATIONThe relay is installed on the right side of Bus S.

When a single phase to ground fault occurs at the rightside of STATCOM and the distance is n*L from therelay point, the positive, negative and zero sequencenetworks of the system during the fault are


7/15


8/15


9/15

Mho characteristic with a positive sequence

voltage polarization is used as zone one distance% .relay to cover 80 of the transmission line

IMULATION RESULT


10/15

To study the coverage of the mho characteristic, faults atdifferent positions have been studied, and the apparentresistance and reactance for different fault locations are


11/15

phase to phase fault

TATCOM th i ht


12/15

TATCOM on the rightside


13/15

imulation resultsDuring a fault, the apparent impedance will increase if the STATCOMsupplies reactive power to the system, the apparent impedance willdecrease and vice-versa.Influence ratio will increase with an increasein location of the fault.

During a phase to phase fault, the apparent reactance increases butthe apparent resistance may decreaseThe position of distance relay has a big impact on the relayperformance.


14/15

CONCLUSIONThe simulation results show clearly the

impact of STATCOM on distance relay.performance

Work is underway in extending the studyfor other types of system and fault

conditions such as the effect of thelocation of STATCOM on distance relay


15/15

THANK Q

the impact of statcom on distance relay

Documents