Abstract
TL (Transmission Line) congestion is a key factor that affects the power system operational cost. In addition of renewable generation in National Grid of Pakistan, transmission line congestion are frequent. Consequently, the network in this particular region faces severe congestion and dynamic stability problems. It has been planned that renewable plants shaved to curtail some available generation to minimize this inevitable congestion. However, one of the cost-efficient solutions to this problem is series compensation of lines using TCSC (Thyristor Controlled Series Compensation). It significantly increases the transfer capability of existing power transmission and enhances the dynamic stability of system at a lower cost, and has shorter installation time as compared to the construction of new TLs. This paper deals with the dynamic modeling of a TCSC in the NTDC (National Transmission and Dispatch Company) network with its applications to alleviate congestion during fault conditions. This study has been carried out using simulation software PSS/E (Power System Simulator for Engineers) which does not have a predefined dynamic model for TCSC, this leads to the necessity of creating a user defined model. The model of TCSC has been programmed in FORTRAN and compiled along with existing dynamic models of network components. The results indicate that power flow and dynamic stability of network is enhanced
Highlights
TL (Transmission Line) congestion is a key factor that affects the power system operational cost
The network of National Grid of Pakistan is modeled in PSS/E tool considering all parameters of the system
The issues of congestion become more frequent due to disturbed voltage profile, generation integration and load demand. These issues are generally observed in NTDC South network after the critical study of Pakistan National Grid in PSS/E tool
Summary
Trests at its two ends, the mountainous region in the North boasts hydropower plants while the Southern side caters a significant amount of thermal and renewable generating units. In near future, NTDC has planned to utilize the wind power potential of the South and to install wind power plants with a combined capacity of 2410 MW, in the region This poses a challenge to the capacity of 500 kV transmission network as the flow through that region increases drastically. We have attempted to make a case for the installation of TCSC near the Matiari region, on the proposed 500 kV TL from Thar Energy Power Plant to Matiari Grid Station It significantly increases the transfer capacity of existing power TLs at low cost, and improves the reliability of the system [7,8]. The practicality of this concept is illustrated by the following discussion
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