23rd Aug, 2021

Vedecom

Question

Asked 14th Feb, 2019

I'm currently designing a single-phase VSI (for a non-industrial environnement) with taking into account EMC constraints (Emission only). What are the relevant EMC standards for such design and application ?

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Very helpful thanks for these answers

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This file should help you, check it from page 10

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For welding machines, the standard for irradiated and conducted electromagnetic emissions is regulated by the international standard IEC 60974-10: 2014 with related attachments such as IEC 61000-3-12: 2011 which determines limits for harmonic currents produced by equipment connected to public low-voltage systems with input current >16 A and ≤ 75 A per phase

Fabrizio Castaldi Thank you !

Kotb M. Kotb Very helpful indeed, thank you !

Sid-Ahmed Aris You are welcome, thanks a lot.

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How to calculate the ∆i_max maximum current ripple for converter during LCL filter design for three phase VSC?

Discussion

4 replies

- Asked 10th Aug, 2021

- Akhtar Hussain Javed

LCL filter are used for grid connected three phase inverters. The design of LCL filter is tricky as it can effect the stability of the system. During the design of LCL filter, to calculate converter side inductor, first maximum current ripple is calculated as

∆i_max=V_dc/(6L_i f_sw )

In above equation both ∆i_max and Li are unkown, so some authors[1] suggest to use 10% of Imax for this ripple current. On the other hand, other paper for example [2] and [3] use a relatively complex method to calculate the value of ∆i_max.

My first question is how accurate is use of 10%*Imax approximation? Are there any other quick way or approximations according to standards to find ∆i_max.

My second question is how to find the right attenuation factor δ for particular value of THD?

[1]M. Dursun and M. K. DÖŞOĞLU, "LCL Filter Design for Grid Connected Three-Phase Inverter," *2018 2nd International Symposium on Multidisciplinary Studies and Innovative Technologies (ISMSIT)*, 2018, pp. 1-4, doi: 10.1109/ISMSIT.2018.8567054.

[2]Said-Romdhane, M.B.; Naouar, M.W.; Belkhodja, I.S.; Monmasson, E. An Improved LCL Filter Design in Order to Ensure Stability without Damping and Despite Large Grid Impedance Variations. *Energies* **2017**, *10*, 336. https://doi.org/10.3390/en1003033

M. Ben Saïd-Romdhane, M.W. Naouar, I. Slama. Belkhodja, E. Monmasson,

[3]Simple and systematic LCL filter design for three-phase grid-connected power converters,

Mathematics and Computers in Simulation, Volume 130,2016,Pages 181-193,ISSN 0378-4754,

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