AHMET METE VURAL, KAMİL ÇAĞATAY BAYINDIR

Optimal IPFC damping controller design based on simplex method and self-tuned fuzzy damping scheme in a two-area multimachine power system

This paper develops a novel self-tuned fuzzy damping control scheme for an interline power flow controller (IPFC) to suppress the interarea mode of oscillations in a multimachine power system. The nonlinear adaptive damping controller is based on coordinated operation of two fuzzy inference systems. The first one produces the required $q$-axis voltage reference of the quasi multipulse series converter in response to generator angle oscillations, while the second one is used to tune the output of the first one online for further reducing the error signal using a given set of fuzzy rules. The simplex method is employed to search for optimal gains of the damping controller by minimizing the objective function in which speed deviations between generators are formulated. The feasibility of the proposed technique is validated using time-domain simulation cases in the PSCAD simulation program. It is also shown that the proposed damping scheme for IPFC works better than the static synchronous series compensator, which utilizes the same damping scheme in reducing the interarea mode of oscillations.

Anahtar Kelimeler:

Interline power flow controller, static synchronous series compensator, quasi multipulse converter, self-tuned fuzzy damping control, simplex method, transient stability, interarea mode of oscillation

Optimal IPFC damping controller design based on simplex method and self-tuned fuzzy damping scheme in a two-area multimachine power system

Keywords:

Interline power flow controller, static synchronous series compensator, quasi multipulse converter, self-tuned fuzzy damping control, simplex method, transient stability, interarea mode of oscillation,

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Total harmonic distortion (THD) content
Table 2 summarizes voltage distortions of Buses 1 and 2 as a measure of THD. Records of the simulated cases taken at 12.5 s show that the THD values are within acceptable limits when the STFDC is activated in both control loops of the IPFC and SSSC [25]. Consequently, filtering is not required for the two FACTS devices even when GTOs are switched at the fundamental system frequency of 60 Hz.
Table THD values of power system bus voltages. Case 1 IPF 0.25%
THD for V1(L−L) 0.12% 0.10% THD for V1(L−L)
0.20% THD for V1(L−L)
0.20% THD for V1(L−L) 0.12% 0.08% Case 3 6. Conclusion
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