Analysis and evaluation of the decoupling control strategies for the design of grid-connected inverter with LCL filter

Li, Wenqi; Chen, Xuhui; Pan, Xuetao; Qu, Keqing; Zhao, Jinbin; Tiankai, Ye

doi:10.1049/cp.2015.0530

Cited by 4 publications

(3 citation statements)

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“…(i.e., v gd = v gq = 0), being treated as external disturbances (Hanif et al, 2014). Moreover, for the purpose of control design in synchronous reference frame, an usual way to derive the transfer function of the LCL system is to neglect the coupling terms between d-axis and q-axis, also considering them as external disturbance signals, which greatly simplify the modeling (Xuetao et al, 2015).…”

Section: Modeling and Problem Descriptionmentioning

confidence: 99%

Automatic Design of Robust Controllers for Grid-Tied Inverters based on PSO and Kharitonov's Theorem

Osório

Borin

Koch

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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This paper provides an offline procedure for automatic tuning of robust PI controllers applied to the control of LCL-filtered grid-tied inverters. A particle swarm optimization algorithm is used to tune the control gains based on an objective function, which encompasses frequency and time domain specifications, a limit for the control signal, together with a theoretical assessment of robust stability, by means of Kharitonov's Theorem. Experimental results based on hardware-in-the-loop are provided, confirming that the proposed procedure leads to controls gains that ensure robust stability and suitable grid-injected currents under uncertain grid impedances, complying with the IEEE 1547 Standard and with superior performance when compared to other design alternatives.

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Section: Modeling and Problem Descriptionmentioning

confidence: 99%

Automatic Design of Robust Controllers for Grid-Tied Inverters based on PSO and Kharitonov's Theorem

Osório

Borin

Koch

et al. 2020

Anais Do Congresso Brasileiro De Automática 2020

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show abstract

“…However, unlike the simplest L filter, cross-coupling introduced by the presently popular LCL filter is more complex due to its higher order [11,12]. It is thus difficult to develop simple, while yet highly accurate, techniques for decoupling LCL filter in the SRF, even though more complex techniques do exist in the literature [13][14][15]. The attractiveness of these techniques is, however, hindered by complex design process, noise-sensitive derivatives or multiple variable measurements in practice [16].…”

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 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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“…1). The DC signal from PV panels is controlled by the converter and changed into the AC signal in the inverter with the filter [4]. The control unit is usually a module with a microprocessor and proper peripheral units (e.g.…”

Section: Introductionmentioning

confidence: 99%

Fast and accurate estimation of multifrequency signals with noise and harmonics in control of photovoltaic systems

Kania

Borkowski

2019

J. eng.

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Analysis and evaluation of the decoupling control strategies for the design of grid-connected inverter with LCL filter

Cited by 4 publications

References 0 publications

Automatic Design of Robust Controllers for Grid-Tied Inverters based on PSO and Kharitonov's Theorem

Automatic Design of Robust Controllers for Grid-Tied Inverters based on PSO and Kharitonov's Theorem

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

Fast and accurate estimation of multifrequency signals with noise and harmonics in control of photovoltaic systems

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