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.
Highlights
Industrial and domestic development has led to increased electrical energy demand day to day
To cope with the ever-growing electrical energy demands, the existing transmission systems are often run at or more than their rated capacity which leads to problems in maintaining effective power flow distribution
We have to rely on the existing power system infrastructure with requisite modifications to fully utilize the capability of transmission system
Summary
Industrial and domestic development has led to increased electrical energy demand day to day. To cope with the ever-growing electrical energy demands, the existing transmission systems are often run at or more than their rated capacity which leads to problems in maintaining effective power flow distribution. While we have achieved improved efficiency of power system employing the FACTS devices, it is altogether very important that the power system must be “Reliable” and “Dependable” to ensure stability of Power system [17] These requirements of dependability and reliability are intemperately influenced by the installed power system protection. A dependable protection system must give tripping for faults within its defined zone and a reliable protection system must not fail to operate when it is called for its duty/function Both of these factors lead to desirable Stable Power System.
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