Control Systems

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

By Giuseppe Fusco

Power caliber is a urgent main issue in electrical energy platforms. one of many major necessities of strength caliber administration is the warrantly of a sinusoidal voltage waveform with enough amplitude at every one node of the community. The fulfilment of this kind of keep an eye on aim is facilitated by means of adaptive platforms that may account for unpredictable fluctuations in working conditions.

Adaptive Voltage regulate in strength Systems, a self-contained mixture of thought and novel program, is an in-depth remedy 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 an in depth description of layout equipment: Kalman filtering, parameter-identification algorithms and discrete-time controller layout are all represented. Case reviews tackle purposes concerns within the implementation of adaptive voltage control.

Practicing engineers and researchers in strength platforms and keep watch over engineering will locate this monograph, written by means of representatives of every box, to be a invaluable synthesis of either whereas its obtainable sort also will attract graduate students.

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

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9) π π where the firing angle α is measured starting from the zero-crossing of the phase-to-phase voltage and π/2 ≤ α ≤ π. The partialization of the reactance causes the generation of a distorted current waveform. 7) together with other harmonic currents at odd multiple frequencies of the fundamental one. The amplitude and the phase of the harmonic current phasors depend on the nodal voltage waveform and on the value of the firing angle α(t). Assuming a perfectly-sinusoidal nodal voltage and indicating its amplitude with v1 , the amplitude of the hth harmonic current is given by f (α) = 2 − ih (t) = h sin α(t) cos hα(t) − cos α(t) sin hα(t) 4yR v1 (t) π h(h2 − 1) for h = 5, 7, 11, .

Hereafter, in each simulation study a polynomial T (z −1 ) has been assigned so that the closed-loop step response has a rise time between 10% and 90% equal to about 40 ms, and a settling time at ±2% equal to about 70 ms, corresponding to respectively two and three and half times the fundamental frequency cycle. Concerning the implementation of the voltage regulator scheme, it is worth recalling that the control input u(tc,k ) is saturated between 0 and 1 due to the presence of the SVS actuator.

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. The function β(tc,k ) takes the form ⎧ 2 1 if (tc,k ) > β0 2dz ⎪ ⎪ ⎨ 2 2 (tc,k ) ≤ β0 2dz β(tc,k ) = β(tc,k−1 ) if dz ≤ ⎪ ⎪ ⎩ 2 0 if (tc,k ) < 2dz with β(0) = 1, where 2dz is an empirically selected threshold that activates the dead-zone and β0 is an arbitrary positive constant that sets the width of the hysteresis.

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