Abstract
Power system oscillations are the primary threat to the stability of a modern power system which is interconnected and operates near to their transient and steady-state stability limits. Power system stabilizer (PSS) is the traditional controller to damp such oscillations, and flexible AC transmission system (FACTS) devices are advised for the improved damping performance. This paper suggests a technique for controller parameters tuning of PSS and a shunt connected FACTS device to be operated in coordination. A static synchronous compensator (STATCOM) connected in a two-machine system is considered as a test power system for the system studies. A recent meta-heuristic algorithm, Multi-Verse optimizer (MVO) has been suggested and compared with the other state-of-the-art algorithms. Improvement in system damping has been achieved by minimizing the oscillating nature of the system states by framing the objective function as a function of damping ratio and location of poles of the system. The Phillips-Heffron model of the test system has been designed by considering the system dynamics. The coordinated system behavior under the perturbation in system parameters has been observed satisfactory with the tuned controller parameters obtained from the suggested algorithm.
Highlights
In the present day by day growing open-access power system regime, damping of power network oscillations playing a vital role for trustworthy power transfer to the load ends
This paper considers a STATCOM as power system oscillation damping device alone with the existing power system stabilizers (PSS) for a power network
A rigorous stability analysis has been presented on a sample power system model connected with STATCOM
Summary
In the present day by day growing open-access power system regime, damping of power network oscillations playing a vital role for trustworthy power transfer to the load ends. Power networks are experiencing electromechanical oscillations due to inconsistent conditions prevailing in the network. In damping the electromechanical oscillations, power system stabilizers (PSS) are conventionally used [1]. Due to the expansion in the power network, perturbations in system parameters introduces the oscillations in the whole system [2]. In an extensive power system, weakening in stabilizer performance takes place due to system latency [3]. To balance the load requirements and to run reliably, PSS are operating to their maximum limits and to maintain the whole system in a stable and safe operating mode is becoming a challenging task [4]
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