Dynamic model of non-linear system

[srinaath]

i am finding it difficult to get insight about modelling of non linear system (electrical).
my queries are,
consider the system is DC DC converter...
1) I read that to study the dynamics of the system we linearise the non-linear system...why do we want to linearise it?...
2)can some one please explain me the process of linearisation clearly...why do we want to add perturbation to the operating point...

 

[anorlunda]

What research have you done so far? Have you read the Wikipedia article on this subject? Please do so first, return with a more specific question.