Robust observer-based nonlinear control of multimachine power systems

Decentralized Adaptive Control of Interconnected Non-Linear Systems Using High Gain Observer

“…Various strategies such as time-delay control (Youcef-Toumi and Wu 1992), sliding mode control with perturbation estimation (Moura et al 1997) and disturbance autorejected control (Han 1997), have been proposed. Based on estimating system states and perturbation, a new adaptive feedback linearizing control method has been proposed (Jiang and Wu 2002) and applied for decentralized control of synchronous generators in multi-machine power systems (Jiang et al 2001, Wu andJiang 2001).…”

WAMS based robust HVDC control considering model imprecision for AC/DC power systems using sliding mode control

“…Though the active powers of the tie lines P ac , P tie,A , P tie,B are measurable signals, a direct differentiation operation is not practical because these measurements may be contaminated by noises and the differentiation is sensitive to the high-frequency noises. To obtain the derivative terms of the measured signals, the disturbances auto-rejected control (DARC) [19], which can detect the system states and reject the disturbances automatically, has been proposed and applied in power system control [20]. Another alternative is to design low-pass filters to eliminate the high-frequency noises if the high-frequency band of the noises or the primary frequencies of the inter-area oscillation modes are known [21][22][23].…”

decentralized observation and control of nonlinear interconnected systems

“…The interconnected observer, where the interconnection terms can be used in the observer design, is proposed in [21][22][23]. On the other hand, the decentralized observer and decentralized observer based feedback control, which depend only on the subsystem local inputs and outputs, present an other attempt at designing observers for use in the feedback stabilization for interconnected systems [24,25].…”