Investigation of Combined SVC and TCSC versus IPFC in Enhancing Power System Static Security

Abstract

Electrical power systems are often required to operate at full loading capacity due to ever increasing demand and transmission line contingencies with limited grid expansion. This results in line overload and operating near system limit, thereby threatening system security. Utilization of existing system can be achieved using Flexible Alternating Current Transmission System (FACTS) devices without violating system limits. This research investigation involves static security assessment of a modelled IEEE 30-bus test system in MATLAB/SIMULINK/PSAT environment. The security status with the incorporation of combined Static Var Compensator (SVC), Thyristor Controlled Series Compensator (TCSC) and Interline Power Flow Controller (IPFC) were determined. Prior to this, Contingency Severity Index (CSI) based on Performance Index (PI) of Voltage and Active Power was employed to determine the optimal location of the FACTS devices. Sequential Quadratic Programming (SQP) was applied to determine the optimal sizing/percentage compensation of FACTS. Subsequently, power system with and without the incorporation of FACTS devices were modelled. The ability of the compensated system to withstand credible transmission line contingencies without violating the normal operating limits (bus voltage and line thermal) was examined and presented. The paper presents how combined SVC/TCSC and an IPFC aided the power system to boost its steady state security in the face of possible line contingencies.

Optimal DG Deployment Based on Technical and Economic Considerations with Daily Load Variation

“…Ref. [6] defined the used parameters in solving the optimization problem. There are certain constraints that should be considered to ensure obtaining the optimal location and size of DG units.…”

“…Moreover, the optimal location of distribution static synchronous compensator (DSTATCOM) to improve VSI is presented in [4]. In addition, the impacts of flexible alternating current transmission system (FACTS) devices that are used in transmission system on enhancement the VSI are examined in [5], [6]. On the other hand, the distributed generation (DG) concept [7] has been emerged to fulfill the increase in load demand.…”

Network Coordination between High-Voltage DC and High-Voltage AC Transmission Systems Using Flexible AC Transmission System Controllers

“…FACTS devices use static equipment to transmit AC electrical power, by boosting the network's controllability and power transmission capacity; they are based on power electronics [33]. Figure 3 illustrates several types of FACTS controllers which are classified as series-connected controllers, shunt-connected controllers, combined series-shuntconnected controllers, and combined series-series-connected controllers [34].…”

Static security assessment of power systems: A review

“…In the other part of the paper, a placement problem is presented for IPFC to best effect on the SSA problem. The same placement problem has been presented in Reference 89 but different devices such as IPFC, Static VAR Compensator, and thyristor controlled series compensator have been considered. A numerical method named Sequential Quadratic Programming has been used for optimization.…”