Control Design and Stability Analysis of Power Converters: The Discrete Generalized Bode Criterion

Urtasun, Andoni; Samanes, Javier; Barrios, Ernesto L.; Sanchis, Pablo

doi:10.1109/access.2021.3063016

Cited by 6 publications

(2 citation statements)

References 53 publications

(75 reference statements)

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“…With this purpose, a discrete model of the system and the deadbeat controller is developed in Matlab, where the converter model is obtained using the zero order hold discretization of the plant to model the PWM [23]. The value of the diagonal terms of [R] in (10), denoted by R, are modified, and the closed-loop pole evolution represented in Fig.…”

Section: B Active Damping Of the Lcl Filter Resonancementioning

confidence: 99%

Deadbeat Voltage Control for a Grid-Forming Power Converter With LCL Filter

Samanes

Rosado

Gubía

et al. 2023

IEEE Trans. on Ind. Applicat.

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Grid-forming power converters are controlled as voltage sources to regulate the grid voltage and frequency. These converters can increase power system strength if they impose a voltage waveform resilient to grid transients. For this reason, in this paper, we propose a deadbeat control strategy of the capacitor voltage for high power converters with LCL filter. To damp the LCL resonant poles, an active damping strategy is developed, based on a modification of the deadbeat control law. With this purpose, a notch filter is applied to the electrical variables allowing to emulate different damping resistances for the fundamental component and the harmonics. As a result, the active damping does not introduce tracking errors of the fundamental frequency component, while it provides damping to the filter resonance. The proposed strategy does not require knowledge of the grid impedance, an interesting feature in grid-connected power converters because the grid impedance is generally unknown. Experimental results validate the proposed strategy.

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Section: B Active Damping Of the Lcl Filter Resonancementioning

confidence: 99%

Deadbeat Voltage Control for a Grid-Forming Power Converter With LCL Filter

Samanes

Rosado

Gubía

et al. 2023

IEEE Trans. on Ind. Applicat.

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“…[19], [20] and allows other applications such as control parameters design, health supervision, adaptive control, etc. [11], [12], [21], [22]. The rest of work is arranged as follows.…”

Section: Introductionmentioning

confidence: 99%

Control Performance Characterization and Monitoring Scheme for Power Converters in Weak Grids

Wang,

Liu,

Zeng

et al. 2023

IEEE Open J. Power Electron.

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In weak grids, control performance of power converters is negatively affected by the significantly varied grid impedance, which can easily lead to degradation of anti-harmonic performance, resonances or even system instability. A rapid control performance monitor is therefore proposed in this work to acquire power converters' actual performance indexes, i.e., the crossover frequency and phase margin. With the measured real-time information, important functions like health management, control parameters design and adaptive control of power systems can be conveniently realized. The monitor is implemented by perturbating the control loop of the power converter under test with a frequency-autotuned small signal, showing satisfying dynamic response and anti-noise performance. Thanks to the 100% digital implementation, the proposed performance monitor requires no extra hardware and no further cost. The detailed design of the monitor, based on small signal models derivation employing an envelope modeling method, is presented in this article. Extensive experiments were carried out to verify the efficacy of the proposed monitor.INDEX TERMS Digital control, loop gain, stability margin, weak grids.

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