Comparative evaluation of passive damping topologies for parallel grid-connected converters with LCL filters

Beres, Remus Narcis; Wang, Xiongfei; Blaabjerg, Frede; Bak, Claus Leth; Liserre, Marco

doi:10.1109/ipec.2014.6870163

Cited by 29 publications

(14 citation statements)

References 15 publications

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“…To derive the impedance model for the converter-side current control, and meanwhile keep the electric property at the PoC of VSC, the control loop is closed by only including the converter-side filter inductor L 1 as the plant [34], where the voltage across the filter capacitor V c is seen as the disturbance input. Then, the closed-loop response of the control loop can be expressed as…”

Section: ) Converter-side Current Controlmentioning

confidence: 99%

Passivity-Based Stability Analysis and Damping Injection for Multiparalleled VSCs with LCL Filters

Wang

Blaabjerg

Loh

2017

IEEE Trans. Power Electron.

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188

114

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This paper addresses the harmonic stability resulting from the current-control interactions of the multiparalleled, LCLfiltered voltage-source converters. First, an alternative impedance model is proposed for the single-loop current control. The control output admittance of the converter is decomposed into a passive filter output admittance in series with an active admittance, which is dependent on the current controller and the time delay. The frequency-domain passivity theory is then applied to the active admittance for system stability analysis. It reveals that the stability region of the single-loop grid current control is not only dependent on the time delay, but affected also by the resonance frequency of the converter-side filter inductor and filter capacitor. Further on, the damping injection based on the discrete derivative controller is proposed to enhance the passivity of individual converters and thereby stabilizing the paralleled converters. Finally, simulation studies and laboratory tests validate the effectiveness of theoretical analysis and controller design.

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Section: ) Converter-side Current Controlmentioning

confidence: 99%

Passivity-Based Stability Analysis and Damping Injection for Multiparalleled VSCs with LCL Filters

Wang

Blaabjerg

Loh

2017

IEEE Trans. Power Electron.

Self Cite

188

114

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“…Alternatively, additional passive or active devices can be used as dampers for stabilizing the systems [10]- [14]. Passive dampers are, in general, robust, but they incur additional power losses [10], [11]. Lower-loss active dampers are therefore preferred, which however require the use of the high-bandwidth converters for suppressing those high-frequency resonances burdening the power systems [12]- [14].…”

Section: Introductionmentioning

confidence: 99%

A Series-<italic>LC</italic>-Filtered Active Damper With Grid Disturbance Rejection for AC Power-Electronics-Based Power Systems

Wang

Pang²,

Loh

et al. 2015

IEEE Trans. Power Electron.

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This letter proposes an active damper with a series LC-filter for suppressing resonances in an ac power-electronicsbased power system. The added series filter capacitor helps to withstand most of the system voltage, hence allowing a lower rated converter to be used for implementing the active damper. Unlike an active power filter for mitigating low-frequency harmonics, the proposed damper dampens resonances at higher frequencies, whose values are dependent on interactions among multiple gridconnected converters and reactive elements of the system. Its control requirements are therefore different, particularly in the low-frequency range, where the series LC-filter is predominantly capacitive, rather than the usual inductive characteristics that exist between voltage-source converters and the grid (or load). This low-frequency challenge can fortunately be resolved by the proposed fourth-order resonant controller, in addition to the second-order resonant controller used for resonance damping. Experimental results obtained have confirmed the effectiveness of these controllers, and hence the feasibility of the active damper.

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“…The PD scheme by adding a resistor in series with the filter capacitor has been widely adopted for its simplicity and highly reliability. However, the additional resistor will result in power loss and decrease the attenuation of the LCL filter [9]. In order to overcome these drawbacks, the concept of virtual resistor was proposed, which is called AD method [10], [11].…”

Section: Introductionmentioning

confidence: 99%

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

Han¹,

Shen²,

Guerrero³

2016

Journal of Power Electronics

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Grid-connected inverters (GCIs) with LCL output filter have the ability of attenuating high-frequency (HF) switching ripples. However, by using only grid-current control, the system is prone to resonances if it is not properly damped, and the current distortion would be amplified significantly under highly distorted grid conditions. In this paper, a synchronous reference frame equivalent proportional-integral (SRF-EPI) controller in αβ stationary frame using the parallel virtual resistance-based active damping (PVR -AD) strategy for grid-interfaced distributed generation (DG) systems to suppress the LCL resonance is proposed. Although both proportional-resonant (PR) controller in αβ stationary frame and PI controller in dq synchronous frame achieve zero steady-state error, the amplitude-and phase-frequency characteristics differ greatly from each other except for the reference tracking at fundamental frequency. Therefore, an accurate SRF-EPI controller in αβ stationary frame is established to achieve precise tracking accuracy. Moreover, the robustness, harmonic rejection capabilities, and influence of control delay are investigated by the Nyquist stability criterion when the PVR-based AD method is adopted. Furthermore, the grid voltage feed-forward and multiple PR controllers are integrated in the current loop to mitigate the current distortion introduced by the grid background distortion. Besides, the parameters design guidelines are presented to show the feasibility and effectiveness of the proposed strategy. Finally, simulation and experimental results are provided to validate the feasibility of the proposed control approach.

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Comparative evaluation of passive damping topologies for parallel grid-connected converters with LCL filters

Cited by 29 publications

References 15 publications

Passivity-Based Stability Analysis and Damping Injection for Multiparalleled VSCs with LCL Filters

Passivity-Based Stability Analysis and Damping Injection for Multiparalleled VSCs with LCL Filters

A Series-<italic>LC</italic>-Filtered Active Damper With Grid Disturbance Rejection for AC Power-Electronics-Based Power Systems

Stationary Frame Current Control Evaluations for Three-Phase Grid-Connected Inverters with PVR-based Active Damped LCL Filters

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