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7-level inverter with fundamental switching frequency strate

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vishnu.m277

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Please HELP me to solve

hi, am doing project on 7-level inverter with fundamental switching frequency strategy , for that i need to solve the fallowing equations by Newton-Raphson method. Please help me on solving below equations

cosΘ1+cosΘ2+cosΘ3=0.6
cos5Θ1+cos5Θ2+cos5Θ3=0
cos7Θ1+cos7Θ2+cos7Θ3=0
 

_Eduardo_

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Re: Please HELP me to solve

vishnu.m277 said:
cosΘ1+cosΘ2+cosΘ3=0.6
cos5Θ1+cos5Θ2+cos5Θ3=0
cos7Θ1+cos7Θ2+cos7Θ3=0
The solution doesn't exist for 0< θi < Π/2


cosΘ1+cosΘ2+cosΘ3 = K
cos5Θ1+cos5Θ2+cos5Θ3 = 0
cos7Θ1+cos7Θ2+cos7Θ3 = 0

No exist triplets 0< θi < Π/2 for K < ~1.2
 

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