Unified LCL circuit for modular active power filter

Wojciechowski, D.

doi:10.1108/03321641211267245

Cited by 5 publications

(12 citation statements)

References 7 publications

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“…Note that the duty ratio is beyond 50% without any stability problem. Other stability problems arise close to the resonance frequency, which are similar to the ones encountered in LCL output filters [7], [8],and [9].…”

Section: Principlementioning

confidence: 92%

Reduced Losses in PV Converters by Modulation of the DC Link Voltage

Bossche

Bikorimana

Feradov³

2014

IJEPE

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Energy and Power Engineering. Vol. 3, No. 3, 2014, pp. 125-131. doi: 10.11648/j.ijepe.20140303.13 Abstract: The efficiency of PV systems has improved by the fact that the researchers have used different techniques to increase their technical capabilities. This paper aims to present how the PV converter losses can be reduced by employing a polypropylene capacitor in the DC link and to modulate that DC voltage. This modification leads to problems with controllability and stability. In order to solve them two current control methods are presented -constant off time and a PWM type with second order high pass filter DC-link feedback. PV converters that utilize polypropylene capacitors do have lower losses and have lower cost. The PV converter simulation in Matlab Simulink TM and lab experiment, presented in this paper, are based on a three-phase bridge APTGF50X60T3G, used to combine a step-up/step down and H-bridge in one package.

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Section: Principlementioning

confidence: 92%

Reduced Losses in PV Converters by Modulation of the DC Link Voltage

Bossche

Bikorimana

Feradov³

2014

IJEPE

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“…During increase of the output voltage, what can be caused by sudden drop of output load, the magnetic material of L 2 and HF transformer will also saturate Here we would like to note, that theoretical analysis of the circuit with non-linear inductor (L1) was already done in Benova et al (2011). Also saturation conditions of HF isolating transformer with Ferrox-cube material (Ferrox Cube, 2008) was investigated in Wojciechowski (2012).…”

Section: Modeling and Analysis Of Lctlc Invertermentioning

confidence: 99%

“…where μ 0 is absolute permeability, defined as the permeability in a vacuum, μ r is relative permeability of a material relative to that of free space and μ e is effective permeability (Wojciechowski, 2012) (Figure 3). The inductance (Figure 3) is linear for small values of current.…”

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confidence: 99%

Analysis of non-linear inverter circuitry of LCTLC topologie

Dobrucký

Frivaldský

Koscelnik

2015

COMPEL

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Purpose -Many electric circuits feature some type of non-linearity of their used devices. Non-linear resistors or inductors could be typical examples. Also, all semiconductor devices are in their nature non-linear ones. The simulation models are very important parts of the design of the devices in various fields of industry. Multiply (multiple) simulation, verified by the measurement on the physical sample, help to improve the converter design by understanding the current and voltage behavior of non-linear elements. The paper aims to discuss these issues. Design/methodology/approach -Mathematical model of LCTLC inverter was made. Fictitious exciting function was applied on LCTLC inverter model. The non-linear inductance with the real core EFD model has been created and consequentially used for MatLab simulation experiments. MatLab and OrCAD/PSpice simulation results were compared with experimental measurements carried out on physical sample. Findings -The authors have found how to simulate non-linear resonant circuits within mathematical apparatus using fictitious exciting function method. The authors provided comparisons between proposed simulation mathematical model and relevant physical sample. Multiply simulations can help to improve the converter design by understanding the current and voltage behavior of non-linear elements.Research limitations/implications -The proposed method is applicable for simulation purposes. The only limitation is that MatLab model does not include hysteresis curve of the core, therefore it has to be modeled. Practical implications -The design of power supplies (switched mode power supplies, UPS and resonant inverter). Originality/value -Research in the area of behaviors of non-linear components in resonant circuits.

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“…There are two main control strategies for the shunt APF in accordance with the control theory: feedforward open-loop control [8,11,17,19,[24][25][26] and feedback closed-loop 2 of 17 control [3][4][5][6][7][9][10][11][12]15,16,18,[21][22][23]30]. They are based on the selection of the current around the point of common coupling (PCC), which is used in the control.…”

Section: Introductionmentioning

confidence: 99%

Stability Analysis of Shunt Active Power Filter with Predictive Closed-Loop Control of Supply Current

Bielecka

Wojciechowski

2021

Energies

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This paper presents a shunt active power filter connected to the grid via an LCL coupling circuit with implemented closed-loop control. The proposed control system allows selective harmonic currents compensation up to the 50th harmonic with the utilization of a model-based predictive current controller. As the system is fully predictive, it provides high effectiveness of the harmonic reduction, which is proved by waveforms achieved in performed tests. On the other hand, the control system is prone to loss of stability. Therefore, the paper is focused on the stability analysis of the discussed control system with the additional outer control loop of the supply current with predictive control of this current. The conducted stability analysis encompasses the assessment of system stability as a function of the coupling circuit parameter identification accuracy, whose values are implemented in the current controller, as well as parameters such as the sampling frequency and proportional-integral (PI) controller coefficients. The obtained results show that the ranges of the LCL circuit parameter identification accuracy for which the system remains stable are relatively wide. However, the most effective compensation of the supply current distortion is achieved for the parameters identified correctly, and the greatest impact on the compensation quality has the value of L1 inductance.

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Unified LCL circuit for modular active power filter

Cited by 5 publications

References 7 publications

Reduced Losses in PV Converters by Modulation of the DC Link Voltage

Reduced Losses in PV Converters by Modulation of the DC Link Voltage

Analysis of non-linear inverter circuitry of LCTLC topologie

Stability Analysis of Shunt Active Power Filter with Predictive Closed-Loop Control of Supply Current

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