Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

Ahn, Hyo Min; Oh, Chulhong; Sung, Won-Yong; Ahn, Jung-Hoon; Lee, Byoung-Kuk

doi:10.5370/jeet.2017.12.1.217

Cited by 5 publications

(4 citation statements)

References 7 publications

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“…Passive filtering is also one of the common methods used in noise suppression. For example, Ahn et al proposed an LCL filter with passive damping circuits for three-phase grid-connected inverters [20]. The circuit has a simple structure and uses current signals for transmission.…”

Section: Introductionmentioning

confidence: 99%

Research on Frequency‐Domain Electromagnetic Detection Signal Acquisition Technology Based on Multi‐frequencyLCFiltering

Liu,

Yu,

Tian

et al. 2023

IEEJ Transactions Elec Engng

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Frequency‐domain electromagnetic (FDEM) instruments are effective tools for detecting underground electrical abnormal targets. However, due to the influence of various noises in the detection process, would lead to l poor signal‐to‐noise ratio of the system and would ultimately affect the detection accuracy. And FDEM detection systems have a defined measuring range. Excessive noise will lead to saturation of the system acquisition and distortion of the measurement. Because of the above problems, an acquisition technique for the FDEM receiving system is proposed to achieve noise suppression in the detection process. The scheme proposes a multi‐frequency LC filtering circuit to optimize the analog signal acquisition module of the receiver system. The circuit converts the measured voltage signal into a current signal, improving the system's immunity to interference. At the same time, the noise of non‐target frequencies in the measured signal is suppressed, avoiding saturation of the receiving system acquisition, and realizing high signal‐to‐noise acquisition of multiple target frequencies. First, the principle of circuit design is analyzed, and the design flow of circuit parameters is proposed. Further, the validity of the design is verified via simulation results. Finally, the optimization scheme is validated with an actual circuit. The results show that for the measurement environment set in this paper, this optimization scheme can suppress the noise of non‐target frequency in the measured signal, so that the noise amplitude can be reduced by more than 90%, and the signal‐to‐noise ratio of the filtered signal can be improved by 23.35 dB. This study helps to facilitate FDEM instruments to achieve high signal‐to‐noise ratio detection. © 2023 Institute of Electrical Engineers of Japan. Published by Wiley Periodicals LLC.

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Section: Introductionmentioning

confidence: 99%

Research on Frequency‐Domain Electromagnetic Detection Signal Acquisition Technology Based on Multi‐frequencyLCFiltering

Liu,

Yu,

Tian

et al. 2023

IEEJ Transactions Elec Engng

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“…However, the inherent disadvantage of the low damping resonance of an LCL filter in inverter control technology is still under discussion [10,11]. Compared with the passive damping control method, active damping can provide an appropriate damping coefficient without increasing the extra loss of the system, thus achieving the purpose of weakening the resonant peak [12][13][14]. Common active damping control techniques include capacitor current feedback [15,16], capacitor voltage primary differential feedback [17], grid-connected current secondary differential feedback [18,19], and multi-state variable combined control [20,21], etc.…”

Section: Introductionmentioning

confidence: 99%

Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

Zhang

Hao

et al. 2021

Applied Sciences

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Aiming at the problem of power coupling and complicated decoupling in the d-q coordinate system of a three-phase grid-connected inverter, a current closed-loop control strategy based on an improved QPIR (quasi-proportional integral resonant) controller in the α-β two-phase static coordinate system is proposed. Firstly, the mathematical model of an LCL three-phase grid-connected inverter is established, and its instantaneous power calculation equation is deduced. Secondly, the frequency method is applied to compare and analyze the proportional resonant, quasi-proportional resonant, and improved current controller, and the appropriate improved controller parameters are obtained according to the traditional proportional integral controller parameter design method and the weight coefficient. Finally, the improved controller is compared with the traditional controller in the simulation model of the LCL three-phase grid-connected inverter based on active damping. The results show that the proposed improved current control strategy has good dynamic response characteristics, can realize the non-static error control of grid-connected current, and realizes the decoupling control of active power and reactive power when the load jumps. At the same time, the results also prove the superiority of the proposed control strategy and verify its effectiveness.

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“…Active damping is mainly applied to high power filters, where power losses are restrictive; and requires a careful tuning of the converter's control associated to the filter and feedback of relevant variables. 3 In the case of passive damping, there exist several options of circuits like: an R component in series or in parallel with the C part of the LCL filter 2,4 ; or, RC or RLC branches. 5 In accordance with Reference 6, R component in series connection is better, because the damping is easy to calculate and implement, though it can have high losses.…”

Section: Introductionmentioning

confidence: 99%

A multi‐objective optimized design of LCL filters for grid‐connected voltage source inverters considering discrete components

Hernández

Mina

Calleja

et al. 2021

Int Trans Electr Energ Syst

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This work proposes a multi-objective optimized design for an LCL filter taking into account discrete components. Volume and power losses are objective functions, while harmonic attenuation, total inductance, and control capability are handled as constraints. For power loss calculation, the currents at fundamental and switching frequency in the LCL filter are calculated. Here, currents at switching frequency are calculated using corresponding simplified transfer functions. On the other hand, decision variables (inductances, capacitance, and damping resistance) are taken from a database of commercial components (discrete decision variables), getting a filter whose final performance results directly from the design process. Under this scenario, the optimization problem is solved using the Non-Dominated Sorting Genetic Algorithm II. The methodology provides a Pareto Front of solutions with both objective functions. Every solution (filter design) has specific commercial components, and designer can select the one, which better fits with his requirements. As example, an LCL filter for a 1 kVA three-phase inverter is designed, where two of the resulting filters are simulated together with the inverter, using PSIM software, in order to evaluate their performance.

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Analysis and Design of LCL Filter with Passive Damping Circuits for Three-phase Grid-connected Inverters

Cited by 5 publications

References 7 publications

Research on Frequency‐Domain Electromagnetic Detection Signal Acquisition Technology Based on Multi‐frequencyLCFiltering

Research on Frequency‐Domain Electromagnetic Detection Signal Acquisition Technology Based on Multi‐frequencyLCFiltering

Improved PR Control Strategy for an LCL Three-Phase Grid-Connected Inverter Based on Active Damping

A multi‐objective optimized design of LCL filters for grid‐connected voltage source inverters considering discrete components

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