Multiple resonant controllers strategy to achieve fault ride‐through and high performance output voltage in UPS applications

Carballo, Roberto; Botterón, Fernando; Oggier, Germán G.; García, Guillermo

doi:10.1049/iet-pel.2018.5603

Cited by 14 publications

(8 citation statements)

References 37 publications

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“…The model of the internal loop (current loop) is expressed in the stationary reference frame αβ as follows [30,31]:…”

Section: Model Of the Current Loopmentioning

confidence: 99%

“…The model of the internal loop (current loop) is expressed in the stationary reference frame

α β

as follows [30, 31]:

L_{lf} \frac{d i_{normalf}^{α β} false(t false)}{d t} = e^{α β} - R_{lf} i_{f}^{α β} (t) - v_{f}^{α β} (t),

With

e^{α β}

i_{normalf}^{α β}

, and

v_{normalf}^{α β}

are the output voltage of the DG, the current flowing through the filter

R_{lf} L_{lf}

on the inverter side and the voltage of the filter capacitance, respectively.

L_{lf}

and

R_{lf}

are the inductor of the filter converter‐side and the equivalent series resistance, respectively.…”

Section: Dynamic Model Of the Voltage/current Systemmentioning

confidence: 99%

“…The FO controller designed for the outer voltage loop with an SMC-based inner current loop to ensure a better performance in terms of the system's dynamic response and augment the system's robustness against parameter variations. In [31], it is proposed to use a plug-in structure based on proportional and multiple resonant controllers in both, the inner and the outer control loops to achieve stability from no load to short-circuit conditions. The predictive control [32] has the advantage to take into account different constraints (ex.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Bouzid

Sicard

Chaoui

et al. 2019

IET Power Electronics

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This study proposes a cascaded voltage-current robust control strategy for a distributed generator (DG) in microgrids. The main objective of the proposed controller is to improve the performance and power quality of a DG by injecting simultaneously a good sinusoidal voltage/current to the different loads connected to the DG. The proposed cascaded voltage/ current controller consists of three degree-of-freedom controller, which is designed by using H∞ control theory based on mixed sensitivity specifications. The choices of appropriate weighting functions W t , W u , W y that satisfy the preset goals to get a robust controller and a transform to a standard H∞ control design problem based on pre-compensator, feedforward and feedback connections are presented. The 3DOF-controller is based on MATLAB R/SimPowerSystems and using RT-EVENTS-toolbox. The controller is evaluated under different scenarios: transient responses with a resistive local load, and loads disturbances in steady-state responses with resistive, resistive inductive, resistive capacitive, and non-linear loads. Simulation and experimental results of resulting waveforms from a DG unit are presented, it confirms the effectiveness of the proposed method in effectively rejecting perturbation and robustness to loads disturbances; both good reference tracking and good transient response, and finally significantly lead to a very low total harmonic distortion.

show abstract

“…The model of the internal loop (current loop) is expressed in the stationary reference frame αβ as follows [30,31]:…”

Section: Model Of the Current Loopmentioning

confidence: 99%

“…The model of the internal loop (current loop) is expressed in the stationary reference frame

α β

as follows [30, 31]:

L_{lf} \frac{d i_{normalf}^{α β} false(t false)}{d t} = e^{α β} - R_{lf} i_{f}^{α β} (t) - v_{f}^{α β} (t),

With

e^{α β}

i_{normalf}^{α β}

, and

v_{normalf}^{α β}

are the output voltage of the DG, the current flowing through the filter

R_{lf} L_{lf}

on the inverter side and the voltage of the filter capacitance, respectively.

L_{lf}

and

R_{lf}

are the inductor of the filter converter‐side and the equivalent series resistance, respectively.…”

Section: Dynamic Model Of the Voltage/current Systemmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Robust three degrees of freedom based onH∞ controller of voltage/current loops for DG unit in micro grids

Bouzid

Sicard

Chaoui

et al. 2019

IET Power Electronics

View full text Add to dashboard Cite

show abstract

“…The reduction of output impedance through the application of the internal model principle (IPM) [15] in repetitive [12, 13, 16–19] and resonant [19–23] controllers allows achieving the asymptotic tracking of a sinusoidal reference and the rejection of periodic disturbances produced by the load current. Although these characteristics are adequate for the implementation of inverter control systems used in UPS that operate in islanded mode, in the case of inverters connected in parallel a reduced value of the output impedance can cause high circulating currents as a result of parametric differences [3] while also producing differences in the currents provided to the load by each inverter.…”

Section: Introductionmentioning

confidence: 99%

“…On the other hand, the output impedance in inverters that can operate both in parallel and in islanded mode must have reduced values at the fundamental frequency and its harmonics to meet with the individual harmonic content and harmonic distortion established by international quality standards [16, 20, 21, 24]. For this reason, the implementation of the output impedance in parallel‐connected inverters, where the control of the output voltage is carried out through repetitive control, requires considering a new type of implementation of the virtual‐impedance loop.…”

Section: Introductionmentioning

confidence: 99%