Wyniki wyszukiwania - Biblioteka Nauki

1

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

100%

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

Przegląd Elektrotechniczny

|

2011

|

tom 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.

2

Effective controller design for the three-phase cascaded H-bridge multilevel active power filter

100%

Han Y.

Przegląd Elektrotechniczny

|

2012

|

tom R. 88, nr 4a

257-265

EN

This paper presents the modelling and effective controlled design for the three-phase cascaded H-bridge (CHB) multilevel active power filter (APF).The mathematical model of the CHB-APF is derived using state-space representations, and the discrete domain model is also presented. A robust predictive current controller is proposed, which shows excellent steady-state precision and sufficient dynamic characteristics owing to the Luenberger observer-based adaptive control algorithm. The digital simulation results obtained from the Matlab/Simulink and the electromagnetic transient program (EMTP-ATP) are presented. The validity and effectiveness of the devised control algorithms are validated by the simulation results.

PL

Zaprezentowano modelowanie I projekt trzyfazowego kaskadowego wielopoziomowego filtru aktywnego mocy. Opracowano predykcyjny sterownik prądu z algorytmem bazującym na obserwatorze Leuenbergera. Zaprezentowano symulacje z wykorzystaniem programu Matlab/Simulink i EMTP-ATP.

3

Model predictive control of multilevel cascaded converter with boosting capability – experimental results

100%

Wiatr P. , Kryński A.

Bulletin of the Polish Academy of Sciences. Technical Sciences

|

2017

|

tom Vol. 65, nr 5

589--599

EN

The main goal of this paper is to present a five-level converter with the feature of output voltage boosting capability. Thanks to its modular construction and single DC source usage, 5LCHB converter becomes an important alternative for two-level converters operating with DC-DC converters that use bulky inductors. Furthermore, model predictive control (MPC) method is presented, which allows for boosting output voltage of presented converter while providing three-phase load current control and flying capacitor voltage stabilization. The last section describes a 5kVA laboratory model of five-level hybrid converter interfacing RL load and shows experimental results confirming theoretical analysis derived in previous sections.

4

Model predictive control of multilevel cascaded converter with boosting capability – a simulation study

100%

Wiatr P. , Kazmierkowski M. P.

|

2016

|

tom Vol. 64, nr 3

581--590

EN

This paper presents a multilevel cascaded H-bridge 5-level converter with boosting capability. The standard solution for boosting voltage in power electronic devices is based on a DC-DC converter with a bulky inductor. However, inductor is a problematic component of a power electronic converter because usually it has to be individually designed and produced for every device and also because its size and weight do not allow for compact construction. This paper presents model predictive control (MPC) method that gives boosting capability for the presented converter. A novel contribution of this paper is the development of a predictive model of the converter and cost function enabling output current control and capacitor voltage balancing.

5

Modeling and current control strategy for a medium-voltage cascaded multilevel statcom with LCL filter

80%

Zhao X. , Shi L. , Chen L. , Xia Z. , Bendre A. R.

|

2015

|

tom Vol. 95, nr 1

1--13

EN

The Static Synchronous Compensator (STATCOM a.k.a. SVG) is widely used to regulate dynamic reactive power and to solve dynamic voltage stability problems. Modeling shows that a cascaded STATCOM, which is composed of several cascaded H-bridges, not only has strong coupling characteristics when an LCL filter is added but it is also a non-linear, multivariable system. Therefore, its practical design and application are dicult to implement. In this paper an internal decoupling control algorithm is introduced to provide independent control of the active and reactive currents. Decoupling control algorithms are proposed, and models and simulation of the decoupling are provided. We describe the setting up of a simulation and experiments with a cascaded STATCOM based on combined circuit topology with a multi-field programmable gate array (FPGA), and double-loop control algorithms with a current inner loop, and a capacitor voltage outer loop. To provide control of the current inner loop, proportional-integral (PI) and resonant controllers are used, having the control ability to cancel harmonics while compensating for the reactive power. This paper presents new current-tracing control models that compensate for the fundamental current and eliminate selective harmonics by adopting a d-q synchronous reference frame, and a discrete Fourier transform (DFT). Voltage balance is realized by introducing modulation wave distribution strategies. Furthermore, both simulation and experiments are employed to verify the feasibility and eectiveness of the control strategy.