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1

Passivity-based Controller Design and Stable Control Region Analysis of the Cascaded DSTATCOM

Xu L., Han Y.

Przegląd Elektrotechniczny

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2012

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R. 88, nr 3b

140-148

EN

This paper proposes a novel passivity-based control scheme for the cascaded H-bridge (CHB) DSTATCOM. The mathematical model of the CHB-DSTATCOM is devised by partitioning the CHB-DSTATCOM into n-block subsystems, and the control algorithm is devised using the adaptive passivity controller. The power balancing mechanism and the stable control region are analyzed using the phasorial diagram representation. The Electromagnetic Transient Program (EMTP) is used for digital simulation, and the Transient Analysis of Control System (TACS) and the MODELS language of the EMTP are utilized for control algorithm implementation. The simulation results of the CHB-DSTATCOM under abrupt dclink voltage variations are provided with comparative evaluations. The devised control scheme of the CHB-DSTATCOM is validated by the simulation and experimental results from the prototype system.

PL

W artykule zaproponowano układ sterowania kaskadowo połączonych systemów DSTATCOM biorąc pod uwagę składowa bierną mocy. Mechanizm równoważenia mocy i sterowanie stabilnością są analizowane na podstawie reprezentacji fazora.

2

Power balancing control strategies for the cascaded H-bridge multilevel DSTATCOM

Han Y., Xu L., Mansoor Khan M., Chen Ch.

Przegląd Elektrotechniczny

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2011

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R. 87, nr 2

212-219

EN

This paper proposes a novel power balancing control scheme for the cascaded H-bridge (CHB) DSTATCOM. The principle of the carrier phase-shifted pulse-width modulation (CPS-PWM) and the mathematical model of the CHB-DSTATCOM are presented. The power balancing mechanism and the stable control region are analyzed using the phasorial diagram representation. The current loop controller is designed by using root locus approach, and the dc-link voltage balancing controller is synthesized based on the devised power balancing mechanism. The simulation results obtained from the alternative transient program (ATP) are presented and evaluated. The validity and effectiveness of the control scheme is confirmed by the simulation and experimental results.

PL

Zapropnowano nową metodę równoważenia mocy w kaskadowym H-mostkowym SSTATCOM. Zaprezentowano zasadę modulacji przesunięcia fazowego i szerokości impulsu CPS-PWM i model matematyczny CHB-DSTATCOM. Równoważenie mocy i analiza stabilnego sterowania zostały przeprowadzone przy użyciu diagramu fazowego. Kontroler pętli prądowej został zaprojektowany przy użyciu obwiedni pierwiastkowej a kontroler napięcia dc-link jest syntetyzowany na podstawie balansu mocy. Przedstawiono symulowane rezultaty. Symulacje i eksperymenty potwierdziły skuteczność metody.

3

Compensative control chart of angular velocity sensor on basis of wave solid-state gyroscope

Gankevych Z., Kucher S., Bondar P.

Vibrations in Physical Systems

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2010

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Vol. 24

111--116

EN

This work is devoted to results of research wave solidstate gyroscope (WSG) with a metallic cylinder resonator and piezoelectric systems of excitation and pickup information, which works in the mode of compensation angular velocity sensor. This type of device becomes more and more attractive thanks to its low cost, considerable vibrostability, shockproof and enough high precision characteristics. In the work there are results of design the power balancing channel, which provides functioning of gyroscope in the compensative mode in the environment of MatLAB-Simulink. Numerical parameters, namely basic mode frequencies of vibration, which are used in model, were got by means of finite element analysis of real resonator model in the environment of ANSYS. It is shown that application of integral-position control law gives the desired dynamic characteristics both to the action of permanent angular speed and to the change of it by harmonic law.