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Design and Research on Passive Controller for Three-phase Voltage-source PWM Rectifier

Xie Y., Xu W., Zhang Y.

Przegląd Elektrotechniczny

2013

R. 89, nr 3b

68--70

This paper designs crude oil electric dehydration pulse power rectifier control system based on passivity-based control theory. This paper deduces the mathematical model of PWM rectifier on the basis of Euler-Lagrange (EL) Equation, proves passivity stability of PWM rectifier, deduces passivity-based control laws of the system and PWM modulation laws, and finally completes design of PWM rectifier controller.

W artykule opisano sterowanie dla prostownika pracującego w systemie do dehydratacji ropy naftowej metodami elektrycznym, o impulsowym poborze mocy. Algorytm oparty został na teorii pasywności. Zaprezentowano, oparty na równaniach Euler’a-Lagrange’a model matematyczny prostownika. Przedstawiono opracowane algorytmy sterowania i modulacji oraz dowód stabilności pasywnej urządzenia.

Shock wave smearing by wall perforation

Doerffer P., Szulc O.

Archives of Mechanics

2006

Vol. 58, nr 6

543-573

Normal shock wave, terminating a local supersonic area on an airfoil, not only limits aerodynamic performance but also becomes a significant source of a high-speed impulsive noise on the rotor blade of a helicopter. It is proposed to apply passive control to disintegrate the shock wave by smearing pressure gradients created by the shock. Details of the flow structure obtained by this method are studied numerically. A new boundary condition of a perforated wall is verified against experimental data for a passive control of the shock wave in a channel flow and on an airfoil. This method of shock wave disintegration is proven to work for internal flows in transonic nozzles and appears to be effective for transonic airfoils as well. The substitution of a shock wave by a gradual compression changes completely the source of the high-speed impulsive noise and bears potential of its reduction.