High-performance complex controller for high-power converters with low pulse ratios

Shi, Jingkui; Shen, Jie; Qu, Bo; She, Hongwu; Tan, Zhuohui

doi:10.1109/icpe.2015.7168079

Cited by 13 publications

(6 citation statements)

References 11 publications

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“…The second addition is an imaginary term j K pc ω 0 / s for summing with the usual PI controller, whose gains have been notated as K pc and K ic in the figure. Values of the gains can be found according to procedures established in [21,23], and will hence not be elaborated here.…”

Section: Resultsmentioning

confidence: 99%

“…Other decoupling schemes have therefore been developed. One recent example is the complexvector proportional-integrator (CVPI) method, whose underlying principle is to form an extra complex zero for cancelling the dominant complex pole of the plant that causes cross-coupling [22][23][24]. The absence of the dominant pole then permits the d-and qaxis to be decoupled, regardless of the large time delay.…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Large time‐delay decoupling and correction in synchronous complex‐vector frame

Tang

Xin

et al. 2019

IET Power Electronics

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This study presents an enhanced method for simultaneously achieving optimised disturbance damping and axisdecoupling in high-power converters operating in the synchronous rotating frame. High-power converters are considered here because they are normally constrained to a low-switching-to-fundamental pulse ratio, and hence experience a large control delay as a trade-off. This trade-off lowers bandwidth and phase margin, which in the synchronous frame, are further worsened by cross-coupling between the d-and q-axes. The proposed method, therefore, targets to remove axis-cross-coupling, so that the dynamics and stability of the high-power converter can be significantly improved, even with a large control delay. A procedure for optimising its performances has then been proposed, after evaluating pole-zero trajectories of three critical coefficients associated with filter decoupling, delay decoupling, and phase correction. Such coordinated evaluation using complex-vector models in the synchronous frame has previously not been performed and is hence a major contribution of the study. Simulation and experimental results presented have verified this contribution, the proposed method and its improvement over other recent methods found in the literature.

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Section: Resultsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Large time‐delay decoupling and correction in synchronous complex‐vector frame

Tang

Xin

et al. 2019

IET Power Electronics

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“…This type of controller has been suggested for the first time in 2007 by Tomasz et al [14]. Later it has been used in many applications in engineering and physics, especially in the thermal dynamics for boiling, cooling and optical studies (see [15][16][17]).…”

Section: Parametric Differential Operator (Pdo)mentioning

confidence: 99%

A new parametric differential operator generalized a class of d'Alembert's equations

Aldawish

Ibrahim

2021

Journal of Taibah University for Science

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The studies in operator theory are attracting many researchers. The central aim of this investigation is to formulate a special parametric differential operator (PDO) based on the error function in the open unit disk. The suggested operator is related to the well-known Carlson-Shaffer operator and the differential operator due to Salagean. We express a class of analytic functions to study its performance in view of the geometric function theory. As application, we employ PDO to present the conformable d'Alembert's equation. We discuss the univalent solution of the suggested equation and study some of its geometric behaviours.

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“…In the k + 1th cycle, according to the equation e −j(θ(k+1)) = e −j(θ(k)+ωTs) , the differential equation in the synchronous reference frame can be calculated as: Using Equations (18) and (19), the discrete transfer function of the controlled plant in the synchronous dq reference frame can be preliminarily obtained as:…”

Section: Discrete Model Of the Complex Vector-based Invertermentioning

confidence: 99%

“…Using Equations (18) and (19), the discrete transfer function of the controlled plant in the synchronous dq reference frame can be preliminarily obtained as: …”

Section: Discrete Model Of the Complex Vector-based Invertermentioning

confidence: 99%

A Novel Digital Control Method of a Single-Phase Grid-Connected Inverter Based on a Virtual Closed-Loop Circuit and Complex Vector Representation

Xie

Hong

et al. 2017

Energies

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Abstract:With the rapid development of renewable energy generation, single-phase grid-connected inverters have been widely applied in modern power systems. Since the power output of the renewable sources is continuously changing, independent active/reactive power control and a rapid current tracking performance is supposed to be achieved in a single-phase grid-connected inverter. However, the poor orthogonal-axis-constructing strategy and the ineffective decoupling in some widely-used controllers have severely weakened the dynamic performance of the single-phase inverter. To deal with the challenges above, this study proposes a comprehensive control strategy for current control in a single-phase grid-connected inverter. In the proposed control strategy, a virtual closed-loop is constructed to improve the dynamic performance and realize independent power control under a synchronous frame. Then, complex vector theory is used to model the virtual closed-loop based single-phase inverter, and a novel digital controller is designed based on zero-pole cancellation and minimum beat control to completely decouple the active/reactive components and achieve a supreme current tracking performance. Experimental results are shown to validate the feasibility of the proposed current controller.

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High-performance complex controller for high-power converters with low pulse ratios

Cited by 13 publications

References 11 publications

Large time‐delay decoupling and correction in synchronous complex‐vector frame

Large time‐delay decoupling and correction in synchronous complex‐vector frame

A new parametric differential operator generalized a class of d'Alembert's equations

A Novel Digital Control Method of a Single-Phase Grid-Connected Inverter Based on a Virtual Closed-Loop Circuit and Complex Vector Representation

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