Impact of UPFC on Power Swing Characteristic and Distance Relay Behavior

The main purpose of power swing blocking is to distinguish faults from power swings. However, the faults occur during a power swing should be detected and cleared promptly. This paper proposes an adaptive concentric power swing blocker (PSB) to overcome incapability of traditional concentric PSB in detecting symmetrical fault during power swing. Based on proposed method, two pairs of concentric characteristics are anticipated which the first one is placed in a stationary position (outer of zone3) but the position of the second pair is adjustable. In order to find the position of the second pair of characteristic, Static Phasor Estimation Error (SPEE) of current signal is utilized in this paper. The proposed method detects the abrupt change in SPEE and puts the second pair of characteristic in location of impedance trajectory correspondingly. Second concentric characteristic records travelling time of impedance trajectory between outer and inner zones and compares to threshold value to detect symmetrical fault during power swing. If recorded time is lower than threshold, three-phase fault is detected during power swing. Intensive studies have been performed and the merit of the method is demonstrated by some test signals simulations.

show abstract

“…13 is considered [18]. A three-phase fault is simulated at 90% of the line connecting buses 5 and 1.…”

Section: Simulation Results Of Three-machine Power Systemmentioning

confidence: 99%

Adaptive concentric power swing blocker

Khodaparast

Khederzadeh

2016

Prot Control Mod Power Syst

View full text Add to dashboard Cite

show abstract

“…The performance of Impedance relay when power swing occurs on a transmission line [2]. Relay behavior is observed both for an uncompensated case the line compensated by UPFC.…”

Section: Facts Devicesmentioning

confidence: 99%

Performance Evaluation of Transmission Line Protection Characteristics with DSTATCOM Implementation

Khan¹,

Mahmood²,

Ahmad³

2017

ijacsa

View full text Add to dashboard Cite

Abstract-To meet with the ever-enhancing load demands, new transmission lines should be bolted-on in the existing power system but the economic and environmental concerns are major constraints to this addition. Hence utilities have to rely on the existent power system infrastructure with some modifications. To enhance controllability and boost power transfer potential of the existing power system the use of Flexible Alternating Current Transmission System (FACTS) device is the most viable modification. FACTS devices include Static VAR Compensator (SVC), thyristor controlled series capacitor (TCSC), Thyristor Controlled Reactor (TCR), Thyristor Switched Capacitor (TSC) and Self Commutated VAR compensators i.e. Static Synchronous Compensator (DSTATCOM). Among the FACTS devices,DSTATCOM is the most feasible choice because of its capability to furnish both leading and lagging reactive power, faster response time in comparison with others, smaller harmonic content, inrush current generation is minimum and the dynamic performance with variations of voltage is quite good. DSTATCOM has the ability to have effective control over various issues concerning AC power transmission. However, the Parameters of the protection devices in the present power system are set without taking into account the reaction of these FACTS devices. So in order to ascertain stability and reliability of power system, reaction of FACTS devices with the existent protection schemes must be thoroughly investigated. This paper aims to explore the deviations in the performance characteristics of transmission line protection due to installation of DSTATCOM on a 220KV EHV transmission line using theoretical as well as MATLAB/SIMULINK simulation models. The dynamic performance of a DSTATCOM connected to an existing transmission line system is evaluated when large industrial induction motor is started and voltage sags are introduced.

show abstract

“…The performance of the proposed ELM based FADRS are tested under stressed condition such as power swing [18][19][20][21][22][23][24]. Power swing is one of the major issues and the relay must perform accordingly.…”

Section: (Ii) Testing Of Elm Based Fadrsmentioning

confidence: 99%