A Nonlinear Wide-Bandwidth Digital Current Controller for DC–DC and DC–AC Converters

Buso, Simone; Caldognetto, Tommaso

doi:10.1109/tie.2015.2465351

Cited by 16 publications

(10 citation statements)

References 24 publications

(34 reference statements)

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“…This method is widely explained in [17]. It has been found that, for a switching frequency of 10 kHz, the bandwidth of the virtual method is around 1.3 kHz while with the proposed control algorithm with a switching frequency of 4 kHz is around 2 kHz, as shown Fig.7.…”

Section: A Controllers Bandwidth Comparisonmentioning

confidence: 96%

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Model-Based Active Damping Control for Three-Phase Voltage Source Inverters With LCL Filter

Guzmán

Vicuña

Morales

et al. 2017

IEEE Trans. Power Electron.

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Abstract-This paper presents a robust model-based active damping control in natural frame for a three-phase voltage source inverter with LCL filter. The presence of the LCL filter complicates the design of the control scheme, particularly when system parameters deviations are considered. The proposed control method is addressed to overcome such difficulties and uses a modified converter model in an state observer. In this proposal, the converter model is modified by introducing a virtual damping resistor. Then, a Kalman filter makes use of this model to estimate the system state-space variables. Although the state estimates do not obviously match the real world system variables, they permit designing three current sliding-mode controllers that provide the following features to the closed loop system: a) robust ande active damping capability like in the case of using a physical damping resistor, b) robustness because the control specifications are met independently of variation in the system parameters, c) noise immunity due to the application of the Kalman filter, and d) power loss minimization because the system losses caused by the physical damping resistor are avoided. An interesting side effect of the proposed control scheme is that the sliding surfaces for each controller are independent. This decoupling property for the three controllers allows using a fixed switching frequency algorithm that ensures perfect current control. To complete the control scheme, a theoretical stability analysis is developed. Finally, selected experimental results validate the proposed control strategy and permit illustrating all its appealing features.

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Section: A Controllers Bandwidth Comparisonmentioning

confidence: 96%

“…Besides, the current controller operates by comparing the current samples with a determined thresholds. Therefore, enough signal to noise ratio (SNR) is mandatory for the correct operation of the current controller [17].…”

Section: Introductionmentioning

confidence: 99%

Model-Based Active Damping Control for Three-Phase Voltage Source Inverters With LCL Filter

Guzmán

Vicuña

Morales

et al. 2017

IEEE Trans. Power Electron.

View full text Add to dashboard Cite

show abstract

“…However, the hysteresis current band computed by the conventional method, as in Equations (19) and (20), in general, does not satisfy the Condition (26), except in the case of the ideal condition shown by the dashed line in Figure 6, where the current error at instant t 0 is identical to the computed hysteresis current band ∆i b , i.e.,:…”

Section: Problemmentioning

confidence: 99%

“…However, a disadvantage is that the switching frequency needs to vary in order to keep the peak-to-peak current ripple controlled at all points on the fundamental frequency wave [10]. In order to solve this problem, the adaptive hysteresis current control technique has been presented in the literature [7,26]. In this technique, the hysteresis current band is not fixed, but controlled adaptively in each switching modulation period, based on the measured output voltage values and the desired constant switching frequency.…”

Section: Algorithm Of the Convention Adaptive Hysteresis Current Controlmentioning

confidence: 99%

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A Digital Hysteresis Current Control for Half-Bridge Inverters with Constrained Switching Frequency

2017

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This paper proposes a new robustly adaptive hysteresis current digital control algorithm for half-bridge inverters, which plays an important role in electric power, and in various applications in electronic systems. The proposed control algorithm is assumed to be implemented on a high-speed Field Programmable Gate Array (FPGA) circuit, using measured data with high sampling frequency. The hysteresis current band is computed in each switching modulation period based on both the current error and the negative half switching period during the previous modulation period, in addition to the conventionally used voltages measured at computation instants. The proposed control algorithm is derived by solving the optimization problem-where the switching frequency is always constrained at below the desired constant frequency-which is not guaranteed by the conventional method. The optimization problem also keeps the output current stable around the reference, and minimizes power loss. Simulation results show good performances of the proposed algorithm compared with the conventional one.

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Exact feedback linearization-based permanent magnet synchronous generator control

Ali

Jawad

Guo

et al. 2016

Int. Trans. Electr. Energ. Syst.

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SUMMARYThis paper presents the technical aspects, theoretical analysis, and comparisons of two new permanent magnet synchronous generator (PMSG) grid-interfaced models named PMSG boost and PMSG rectifierinverter. The exact feedback linearization (EFL) control scheme is used for the effective design and stability analysis of the aforementioned models. The complexity of the EFL control laws is discussed in the light of the nonlinear coordinate transformations and linearization (local and global) of the PMSG models. We also discussed the effectiveness of the EFL control over the output Direct Current (DC) link voltage of the PMSG during the electrical grid faults and the mechanical perturbations. Moreover, we compared the aforementioned models and concluded that the stability of the PMSG rectifier-inverter is higher compared with the PMSG boost during the variation of wind speed values from minimum to maximum. Furthermore, the robustness of the EFL control scheme for the PMSG rectifier-inverter is compared with the conventional proportional and integral controller and state-feedback controller. The EFL controller reports a faster output response, better accuracy, and quicker settling time of the output DC link voltage as compared with the proportional integral controller.

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A Nonlinear Wide-Bandwidth Digital Current Controller for DC–DC and DC–AC Converters

Cited by 16 publications

References 24 publications

Model-Based Active Damping Control for Three-Phase Voltage Source Inverters With LCL Filter

Model-Based Active Damping Control for Three-Phase Voltage Source Inverters With LCL Filter

A Digital Hysteresis Current Control for Half-Bridge Inverters with Constrained Switching Frequency

Exact feedback linearization-based permanent magnet synchronous generator control

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