Changes

added a single phase vs three phase application note
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[https://www.hitachi-iesa.com/sites/default/files/inverter-pdf/NT3251X_0.pdf Hitachi WJ200 Quick Reference Guide NT3251X]
 
[https://www.hitachi-iesa.com/sites/default/files/inverter-pdf/NT3251X_0.pdf Hitachi WJ200 Quick Reference Guide NT3251X]
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[https://www.hitachi-iesa.com/sites/default/files/supportingdocs/AN032404-1_Rev_A_Sizing_for_Single-Phase.pdf Hitachi Application Note: Sizing Three-Phase Inverters for Single-Phase Power Applications (AN032404-1, Rev. A)]