Adaptive Voltage Control in Power Systems - Modeling, Design by Giuseppe Fusco

By Giuseppe Fusco

Power caliber is a urgent situation in electrical energy structures. one of many major standards of strength caliber administration is the warrantly of a sinusoidal voltage waveform with enough amplitude at each one node of the community. The fulfilment of this sort of regulate aim is facilitated by way of adaptive platforms that can account for unpredictable fluctuations in working conditions.

Adaptive Voltage keep an eye on in strength Systems, a self-contained mixture of conception and novel software, is an in-depth therapy of such adaptive keep watch over schemes. The reader strikes from power-system-modelling difficulties via illustrations of the most adaptive keep watch over structures (self-tuning, model-reference and nonlinearities repayment) to a close description of layout equipment: Kalman filtering, parameter-identification algorithms and discrete-time controller layout are all represented. Case experiences deal with functions matters within the implementation of adaptive voltage control.

Practicing engineers and researchers in strength structures and keep watch over engineering will locate this monograph, written via representatives of every box, to be a precious synthesis of either whereas its available type also will attract graduate students.

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Extra resources for Adaptive Voltage Control in Power Systems - Modeling, Design and Applications

Example text

The problem is to identify the values of ch,r (t) and ch,i (t) or, equivalently, ch (t) and χh (t), starting from the sampled measurements of the signal c(t). The methods available for the solution of such problem can be classified into: – off-line methods, which assume that the phasors do not change during a given time interval of measurements, that is ch,r (t) = ch,r , ch,i (t) = ch,i , ch (t) = ch and χh (t) = χh ; – on-line methods, which keep on acquiring new sampled measurements so as to identify the phasors and track their variations in real time.

Concerning the order of the dynamic model, in [57] the order is chosen so as to minimize the prediction error but may therefore be very high, whereas in [84] a basic first-order model is assumed. 14) where tc,k = k Tc , k ∈ N0 , Tc being the sampling period and z −1 the unit backward shift operator. 14) the polynomials A(z −1 ) and B(z −1 ) take the form A(z −1 ) = 1 + a1 z −1 + . . + anA z −nA B(z −1 ) = b0 + b1 z −1 + . . + bnB z −nB with b0 = 0; furthermore v1 (tc,k ) is the controlled nodal voltage, u(tc,k ) is the input to the actuator, d is a positive integer representing a delay and v0,1 (tc,k ) the no-load voltage representing the nodal voltage when u(tc,k ) = 0, see [76].

5) T where the constant fictitious input cv can be viewed as a scaling factor allowing an estimate of the aggregate parameter v0,1 . 6) The parameters vector θ is determined in such a way that the cost function for the exponentially weighted squared error is minimum k λk−i T J = (tc,k ) Λk (tc,k ) = 2 (tc,i ) i=1 where Λk = diag λk−1 λk−2 . . 2 Indirect Self-tuning Voltage Regulator Design 41 with λ the forgetting factor, and (tc,k ) = (tc,1 ) . . 9) An estimator dead-zone with hysteresis, represented by the function β(tc,k ), is introduced in the RLS algorithm to switch off the estimator when the excitation level is low.

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Adaptive Voltage Control in Power Systems - Modeling, Design by Giuseppe Fusco
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