Abstract
Problem statement: The inter-area power systems have special characteristic of the stability behavior. The improvement of inter-area power system is one of the important aspects in power system. Approach: This study applies the Static Synchronous Series Compensator (SSSC) to improve stability of inter-area systems. The SSSC is modeled and then is applied to be incorporated into the power system model for investigating stability improvement. The SSSC is modeled as the variable susceptance and is controlled during dynamic state. This presented SSSC model can be incorporated into susceptance matrix of power system model. The presented method is tested on sample inter-area power system with 3 phase fault distubrances. Results: The swing curve of inter-area power system without a SSSC gets increases monotonically and thus the system can be considered as unstable whereas the swing curves of system with a SSSC can be considered as stable. Conclusion: From the simulation results, the SSSC can enhance stability of inter-area power systems.
Highlights
Because of growing demand in electrical energy, Modern power system network is getting much more complicated than ever before
This study presents the method to incorporate Synchronous Series Compensator (SSSC) model into the inter-area power system for investigating stability improvement
A Static Synchronous Series Compensator (SSSC) is a member of the Flexible AC Transmission System (FACTS) family that is connected in series with power system
Summary
Shunt converter (Magaji and Mustafa, 2009b; Kumkratug, 2011a; 2011b; El-Shennawy et al 2010). This study presents the method to incorporate SSSC model into the inter-area power system for investigating stability improvement. The SSSC can be represented by the series voltage injection Vs and X2 is the reactance equivalent of a series transformer and line between bus m and n. From the complex power injections as given in (4), (5), (7) and (8) associated with line voltages, they can be represented by the admittance at bus m as bus n as shown in Fig. 6 and given by: Yss mi. The generator current injection (IG) as given in (13) can be obtained by multiplying the EG with the
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