A Generalized Class of Stationary Frame-Current Controllers for Grid-Connected AC–DC Converters

Abstract

Within power systems, high-power pulsewidth-modulated ac-dc converters are used in flexible ac transmission systems controllers and for interfacing renewable energy sources to the grid. These converters traditionally employed PI controllers designed in the synchronous -frame with decoupling of and axes. Recently, stationary -frame proportional-resonant (PR) controllers have been proposed. Though both types of control are suitable for the regulation of three-phase converters, the PR controller displays steady-state and dynamic behavior that differs significantly from that of decoupled -frame controllers. This paper derives a stationary frame controller that is the exact equivalent of the commonly used synchronous frame controller with decoupling. The new stationary frame "PRX2" controller consists of a proportional (P), a resonant (R), and two cross-coupling components. The PRX2 controller offers identical transient and steady-state performance and has the same frequency response as the decoupled synchronous frame PI controller. Unlike other stationary frame controllers containing resonant components, the PRX2 controller is unique because it contains a cross-coupling feedback component, which accounts for the behavior of the decoupling branches present in synchronous frame controllers. It is shown that ignoring this decoupling component greatly increases the controller's sensitivity to frequency variation. Numerous stationary frame controllers, including the common PR controller, may be derived from the general PRX2 controller.

Voltage feed-forward performance in stationary reference frame controllers for wind power applications

“…There are a lots of paper introduced P-R controller [1][2][3][4][5][6][7][8][9] , here just gave the basic equation as equation (1) and implementing scheme in Fig.2. (2) and (3).…”

“…Compared with conventional synchronous reference frame controller, the P-R controller has many advantages including: eliminates abc-to-dq and dq-to-abc frame transformations which significantly reduces computation burden; removes PLL errors; easy to add the low order harmonic compensation especially the P-R controller could improve the response to unbalanced faults [4] . Due to P-R controller could achieve a very high gain around the given resonance frequency, thus being capable to eliminate the steady-state error when this controller tracking sinusoidal reference, which could be suitable for the using of stationary reference frame control strategy [5] .…”

Implementação de controladores para conversores trifásicos, sem transformações de coordenadas: análise geométrica através de vetores espaciais.

“…(Hwang, et al 2010), (Zmood, et al, 2001), (Briz, et al, 2000). Os dois primeiros também mostram que a utilização do controlador PI no sistema dq, é equivalente a utilizar um controlador ressonante no sistema abc.…”

“…Será analisada a princípio a possibilidade de se rastrearem as três correntes de linha, no sistema abc, com três controladores independentes. Estes controladores podem ser do tipo P ou PI (c68, c72, (Ryan, et al,1997), (Loh, et al, 2003), ); deadbeat (c41, (Buso, et al 2001), (Kawamura, et al 1998)), ressonante (Hwang, et al, 2010), (Loh, et al,2003), (Fukuda, Imamura, 2005), (Zmood, et al, 2001)), repetitivo (Matavelli, Marafão, 2004)), etc. A figura 3.5 ilustra a utilização de três controladores, um para cada fase.…”

“…Comparada às alternativas implementadas no sistema dq ( (Buso, et al, 2006), (Hwang, et al 2010), (Zmood, et al, 2001), (Briz, et al, 2000)), a estratégia com F-1 controladores no sistema abc apresenta a vantagem de operar bem nos casos onde as referências de corrente ou as tensões da rede contêm componentes de seqüência negativa. Isso se explica pelo fato das seqüências positiva e negativa se apresentarem para os controladores individuais como sinais de freqüência fundamental ω .…”