A Control for an Unbalanced 3-Phase Load in UPS Systems

Rymarski, Zbigniew; Bernacki, Krzysztof; Dyga, Łukasz

doi:10.5755/j01.eie.24.4.21474

Cited by 8 publications

(8 citation statements)

References 15 publications

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“…In case of PBC, one period delay was observed in comparison to the MPC output voltage THD stabilization on some constant level. The simulations parameters are based on [24]; however, the system presented in this paper was tuned to the balanced load with changeable filter parameters to maintain the good output voltage quality. The system must fulfill, in the same time, the necessary stabilization conditions for both the controllers.…”

Section: Simulation Resultsmentioning

confidence: 99%

“…The system is very often represented in the dq rotationary frame. For investigation, an improvement of the IDA-PBC [22,23] method was investigated-IPBC2 presented in [24], but based on the non-interconnection equations in the matrix J. In that solution, the controlled variables were introduced to the stationary αβ frame.…”

Section: Improved Passivity-based Controlmentioning

confidence: 99%

“…The IPBC2 problem formulations focused on the difference between interconnection matrix and dissipation matrix and handling the error between current and previous states. Based on [21,24], the interconnection does not occur and J is just the identity matrix. R(x) represents damping matrix, which is the sum of the R L f and dissipating resistance R i , which is 10.…”

Section: Improved Passivity-based Controlmentioning

confidence: 99%

“…The total energy in the presented system is the overall sum of the energy stored in the output filters components [24].…”

Section: Improved Passivity-based Controlmentioning

confidence: 99%

“…For calculation of the IPBC2 controller [24], the value of the reference filter current is needed-i Lαβprev . In this element, it is necessary to take into account the value of the difference between output and reference voltage, so the results should be more robust not only for the output filter current but also for the output filter voltage.…”

Section: Improved Passivity-based Controlmentioning

confidence: 99%

See 4 more Smart Citations

Robustness of Model-Predictive and Passivity-Based Control in the Three-Phase DC/AC Converter Application

2022

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In modern controller design, various solutions for controlling power converter systems can be found depending on their applications, speed of working, pulse width modulation (PWM) techniques, switching frequencies—fc, and different load types. The need to manipulate control parameters can be often observed in classical structures, e.g., well-known PID, repetitive, or deadbeat control particularly sensitive to distinct parameters uncertainties. The purpose of this paper is to present an improved version of controllers designated for a UPS that will be considerably resistant to model changes. Proposed control techniques are independent of unexpected output filter changes: Lf—filter coil inductance and Cf—filter capacitor conductance. The second aspect of this paper is to compare effectiveness of modified predictive MPC (model-predictive control) and feedback PBC (passivity-based control) controllers in reducing output voltage total harmonic distortion (THD) for various load values. The biggest distortions of output voltage were observed during experiments with nonlinear RC load. Both simulation and experimental verification of mismatching parameters were performed and examined. Thanks to the proposed solution, the output voltage THDv quality factor was reduced below 8% in an efficient way for all the applied loads and stayed at the level of 1% when well-matched filter parameters were provided.

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Section: Simulation Resultsmentioning

confidence: 99%