Comparison of L, LC &amp; LCL filter for grid connected converter

Yagnik, Utsav P.; Solanki, Mehul Dansinh

doi:10.1109/icoei.2017.8300968

Cited by 44 publications

(32 citation statements)

References 12 publications

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“…There are three main filter alternatives, known as inductor (L), inductor-capacitor-inductor (LCL), and inductor-capacitor (LC) filters. Among them, the LCL filter configuration is a preferable option due to its better performance in terms of higher harmonic attenuation with a smaller inductor size and cost in comparison with the conventional L or LC filter [4][5][6]. However, complicated dynamic characteristics, as well as the risk of resonance phenomenon in LCL filters, pose a challenge in the controller design for stabilizing the system.…”

Section: Of 27mentioning

confidence: 99%

Frequency Adaptive Current Control Scheme for Grid-connected Inverter without Grid Voltage Sensors Based on Gradient Steepest Descent Method

Tran

Kim

2019

Energies

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This paper presents a frequency adaptive grid voltage sensorless control scheme of a grid-connected inductive–capacitive–inductive (LCL)-filtered inverter, which is based on an adaptive current controller and a grid voltage observer. The frequency adaptive current controller is constructed by a full-state feedback regulator with the augmentation of multiple control terms to restrain not only the inherent resonance phenomenon that is caused by LCL filter, but also current harmonic distortions from an adverse grid environment. The number of required sensing devices is minimized in the proposed scheme by means of a discrete-time current-type observer, which estimates the system state variables, and gradient-method-based observers, which estimate the grid voltages and frequency simultaneously at different grid conditions. The estimated grid frequency is utilized in the current control loop to provide high-quality grid-injected currents, even under harmonic distortions and the frequency variation of grid voltages. As a result, the grid frequency adaptive control performance as well as the robustness against distorted grid voltages can be realized. Finally, an inverter synchronization task without using grid voltage sensors is accomplished by a fundamental grid voltage filter and a phase-locked loop to detect the actual grid phase angle. The stability and convergence performance of the proposed observers have been studied by means of the Lyapunov theory to ensure a high accuracy tracking performance of estimated variables. Simulation and experimental results are presented to validate the feasibility and the effectiveness of the proposed control approach.

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Section: Of 27mentioning

confidence: 99%

Frequency Adaptive Current Control Scheme for Grid-connected Inverter without Grid Voltage Sensors Based on Gradient Steepest Descent Method

Tran

Kim

2019

Energies

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“…However, LC and LCL filters can cause stability problems related to resonance, which have been the subject of significant researchers in recent years [7], [13]- [19]. Alternatively, L filter does not experience the aforementioned problem, and has, in fact, been used in lots of applications with satisfactory results [2], [3], [5], [6], [8], [10], [20]- [36].…”

Section: Introductionmentioning

confidence: 99%

Tuning of Discrete Complex Proportional Integral Current Controller for Grid-Connected Converters Based on Critical Damping

Zhao

Cao

et al. 2020

IEEE Access

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Current control is of utmost importance for grid-connected converters to achieve a high level of performance. The complex proportional integral controller is usually employed for its excellent performance in terms of cross-coupling decoupling and stability. The pole/zero cancellation characteristic of the complex proportional integral controller, which is always valid in the continues-time domain, fails in the discrete-time domain, resulting in an oscillatory or even unstable response. The discrete complex proportional integral controller has thus been addressed in this work, which cancels the complex plant pole with a matching zero provided by the controller in the discrete-time domain. It has been proved that pole/zero cancellation of the discrete complex proportional integral controller is always valid, regardless of the variation of the excitation frequency. An important feature of performance independence from the pulse ratio is thus achieved. Also, to achieve the possible highest performance, a tuning method based on critical damping is developed in the discrete-time domain, which addresses the one-sample delay directly in the tuning process. In this manner, the minimum settling time and negligible overshoot for transient response can be achieved, along with the most enhanced stability and avoidance of closed-loop anomalous peaks. Experimental results have verified the effectiveness of the developed method. INDEX TERMS Current control, grid connected converters, complex proportional integral, discretization.

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“…Electrical energy is needed by the end user, therefore quality and continuity are inseparable and important things when operating with widely used electronic equipment. Most industrial and business consumers use power electronics equipment that requires a large supply of electrical energy [4]. Increased use of power electronics equipment has been of particular concern as it produces large harmonic content.…”

Section: Introductionmentioning

confidence: 99%

Harmonic Meter Design Using Arduino

Lubis¹,

Antoni²,

Harahap³

et al. 2018

IJET

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This paper discusses the measurement of harmonic content using arduino which is simulated with proteus software. The components used in this meter harmonic circuit are resistor, capacitor, LCD, microcontroller atmega 328P. Microcontroller works based on voltage source (TR1) and current source (TR2) on proteus software. The voltage and current delivered to the microcontroller will be read and executed according to the program on the microcontroller. The program used in this arduino microcontroller is the C language program. The results obtained from this study Arduino successfully measure the harmonic content and display the measurement results on the LCD.

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Comparison of L, LC & LCL filter for grid connected converter

Cited by 44 publications

References 12 publications

Frequency Adaptive Current Control Scheme for Grid-connected Inverter without Grid Voltage Sensors Based on Gradient Steepest Descent Method

Frequency Adaptive Current Control Scheme for Grid-connected Inverter without Grid Voltage Sensors Based on Gradient Steepest Descent Method

Tuning of Discrete Complex Proportional Integral Current Controller for Grid-Connected Converters Based on Critical Damping

Harmonic Meter Design Using Arduino

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