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The IUP Journal of Electrical and Electronics Engineering:
Robust Power System Stabilizer Design Under Wide Area Control Using Linear Matrix Inequality Technique
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The paper shows the design of a robust power system stabilizer (PSS) capable of damping electro-mechanical oscillations of unstable open loop plant in the presence of uncertainty in the system model, which is of both deterministic and stochastic nature. Load uncertainty to random signal in the form of noise is taken care of in the design of robust PSS, such that the system performance is largely unaffected. The design consideration involves Linear Matrix Inequality (LMI) framework with various robust control features from H¥, H2 norm criterion to regional pole placements for effective damping in the system. The designed PSS is a dynamic output feedback controller (DOFC) with state matrices as controller parameters. Robust PSS successfully improves damping in the system and also meets improved performance even under transient conditions when the system is subjected to input disturbances at different nodes.

 
 

athrough proper selection of remote signals as input to the controller, which in turn feeds controlled signal as supplementary input signals to FACTS-based devices, excitation systems or HVDC system (Pal et al., 2000; Chaudhuri et al., 2003; Chang, 2007; and Deng et al., 2015). In WAC, feedback signals required in tuning controller are mostly remote signals along with local signals. Phasor Measurement Units (PMU)—which make available phasor measurements like currents, voltages and frequency that are time synchronized with GPS clock—are used to measure local and remote signals to be fed to controller (Rebello et al., 2015). In damping of inter-area oscillations and tuning of controller, it is found that the choice of feedback signals and location of actuators on system are important for desired results (Majumder et al., 2006). In WAC, signals with high observability of modes to be damped are selected as feedback signals. Signals in real-time from remote and local regions are available to controllers and used as feedback for any desired control action (Chang, 2007; Korba and Larson, 2012; and Rebello et al., 2015). Sadikovic (2006), Golestani et al. (2009) and Huang et al. (2010) highlighted inter-area oscillation damping through WAC.

 
 
 

Electrical and Electronics Engineering Journal, Robust power system stabilizer, dynamic output feedback controller, closed loop pole placements, H¥ , H2 norm, minimum damping, Linear Matrix Inequality