Optimal design of passive RC-damped LCL filter for grid-connected voltage source inverters

Albatran, Saher; Koran, Ahmed; Smadi, Issam A.; Ahmad, Hamzeh J.

doi:10.1007/s00202-018-0725-5

Cited by 15 publications

(12 citation statements)

References 31 publications

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“…This technique shapes the impedance of the output filter at the target frequencies through selective harmonic elimination. In [30], the authors proposed a proper optimal design for passive damping filter topology to mitigate the resonance problem that appears in the system. Many other works found in the literature characterized the weak-grid term by adding a relatively large inductance in series with the grid voltage in either renewable sources stability studies or in low voltage ride-through capability calculation for stability studies.…”

Section: Harmonics and Resonance Interaction Voltage Stabilitymentioning

confidence: 99%

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Dynamic Performance Evaluation of Inverter Feeding a Weak Grid Considering Variable System Parameters

et al. 2021

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Interfacing a weak grid imposes challenges on distributed generators (DGs). These challenges include transient frequency and voltage dynamics that can destabilize the system. Accordingly, this paper investigates the grid stiffness based on different scenarios and the dynamics of a grid feeding DG connected to a weak grid. Moreover, the dynamic effects of the physical and control parameters on the system's stability are deeply analyzed and evaluated. Specifically, complete mathematical models and graphical representation are carried out to precisely examine the impact of the system parameters on the stability and performance of the DG. Therefore, stable deployment of renewable energy resources into power networks can be achieved as well as an efficient and robust performance of DGs can be ensured when connected to weak grids. The obtained results show the importance of the performed study in optimal sizing and designing the output filter of the inverter and the impact of tuning the control parameters on the system dynamics. As a result, a proper design of system physical and control parameters can be accurately achieved considering all factors affect the system performance. The paper also conducts detailed and elaborated analyses and simulations to evaluate the performance of a PI-controlled RC damped inverter connected to a weak grid. The proposed filter design of the interfacing inverter can significantly extend the integration of DGs into microgrids without requiring complex control schemes or oversized components.

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Section: Harmonics and Resonance Interaction Voltage Stabilitymentioning

confidence: 99%

“…3, where the equivalent circuit of the grid shows the series grid impedance (Lg and Rg). The damped LC filter is optimized based on [30].…”

Section: Evaluating the Effect Of Grid Stiffness On Inverter Stabilitymentioning

confidence: 99%

Dynamic Performance Evaluation of Inverter Feeding a Weak Grid Considering Variable System Parameters

et al. 2021

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“…The filter equivalent inductance is related to the maximum peakto-peak current ripple (Δi max pp ) and the ratio of the grid-side inductance to the inverter-side inductance (n) as expressed in (18). This ratio is optimized in [12] to be 1.0 and in [19] to be mostly less than 0.5…”

Section: Optimization Procedure Current Controller Tuning and Damping...mentioning

confidence: 99%

“…In [18], a nonoptimized filter design procedure considering the ripple content is introduced. In this effort, the proposed objective function and optimization problem in [19] is modified and utilized to minimize the total filter inductance, minimize the total filter capacitance, and minimize the filter ripple content. This optimal design is proposed to 1) minimize filter total inductance to reduce filter power loses, filter physical size, and filter cost, 2) minimize filter ripple content to reduce filter core losses and current through filter damping branch, and 3) minimize damping resistance and the total capacitance (maximize capacitive reactance to decrease the generated reactive power) to minimize filter damping losses.…”

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Analytical Factorized Model for Stability Analysis and Optimization of Shunt RC Damped LCL Filter for Grid-Connected Voltage Source Inverters

Koran

Albatran

Lai

2020

IEEE Trans. Power Electron.

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In this article, an optimal design procedure of shunt RC damped LCL filter is discussed. The proposed design procedure finds the minimum damping resistance to guarantee the stability of the grid-current controller without affecting the effectiveness of the filter. This minimum value is derived using the factorized filter input admittance and filter forward transadmittance. The proposed factorization procedure allows us to have an analytical expression of system poles and zeros. Moreover, the minimum damping resistor is determined upon the desired crossover frequency and the desired phase margin of the grid-current controller. After that, an objective function is assumed, and an optimization problem is formulated to minimize the physical size of the filter by minimizing the total capacitance and inductance and by minimizing the filter ripple content as well. Accordingly, the proposed objective function minimizes the filter physical size and filter power losses and, hence, enhances filter's efficiency. A prototype demonstrates and validates the proposed filter design and analysis experimentally. I. INTRODUCTIONP ASSIVE power-filters are utilized to interface voltage source inverters to the utility grid or electric loads in order to meet harmonics standards and improve power quality. The design and selection of the filter parameters are nontrivial due to many aspects such as the variable grid-inductance and the power quality constraints at the point of common coupling. A set of filter parameters may function well in the laboratory environment, but it may run into instability due to the shift of the filter resonance frequency or high quality factor (Q), which tends to amplify the system noise. Proper active [1]-[3] or passive-damping [4]-[9] selection and design of the power-filter improves control system stability and avoids the interaction between load and source impedances. On the contrary, improper active or passive-damping of the power-filter reduces the overall system efficiency due to the increase in damping power losses Manuscript

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“…However, it has two zeroimpedance resonance points, which amplify the current harmonics at the resonance frequency and affect the system stability, causing resonance. There are two methods for reducing resonance of LCL filter: active damping (Liu et al, 2021) and passive damping (Albatran et al, 2018). Compared with the passive damping method, the active damping method avoids the use of passive components and reduces the loss of passive components, but at the cost of the increasing control complexity (Beres et al, 2016a).…”

Section: Introductionmentioning

confidence: 99%

Bypass Inductor Type LCL Filter Parameter Optimization for Three-Level Grid-Connected Converter

Zhang

Xiao

et al. 2022

Front. Energy Res.

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In the application of the three-level grid-connected system, passive damping is the most common method to keep the LCL filter working stably. However, in the case of high power density, the low switching frequency of the grid-connected converter results in the complexity of filter parameter design, and the increase in passive components leads to lower equipment utilization efficiency. To solve the above problems, based on the optimization of resonant frequency and system loss, this study proposes a set of LCL filter parameter design processes of a three-level neutral point clamped (NPC) converter, which can switch components freely and is easy to achieve. This study explores the theoretical evidence and application value of the proposed design, considering the influence of the current ripple and the reactive power limit. The design adopts the improved passive damping method to select the appropriate inductance ratio and impedance ratio to make the resonance frequency of the whole system and the extra loss of the system smaller. The simulation and experiments show that compared with the conventional method, the improved design method reduces the current THD of the grid side by 1.5% and the damping resistance loss by 0.17%.

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Optimal design of passive RC-damped LCL filter for grid-connected voltage source inverters

Cited by 15 publications

References 31 publications

Dynamic Performance Evaluation of Inverter Feeding a Weak Grid Considering Variable System Parameters

Dynamic Performance Evaluation of Inverter Feeding a Weak Grid Considering Variable System Parameters

Analytical Factorized Model for Stability Analysis and Optimization of Shunt RC Damped LCL Filter for Grid-Connected Voltage Source Inverters

Bypass Inductor Type LCL Filter Parameter Optimization for Three-Level Grid-Connected Converter

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