Load of converter is 3kW, but every time input power coming much more than output power what may be the error?
Dear Ankit,
you did not give too much details so it is a bit difficult to assess what might go wrong. So I'll just show some potential issues:
1.If you model is including component losses: it is normal that you have losses. Efficiency numbers beyond 85 % are difficult to achieve so an input power of > 3.5 kW is to be expected.
2. If the SEPIC is used as a power factor controller check whether the input current is near to sinusoidal. If not component dimensioning is wrong at some point. You'll have to check thoroughly at which point a) inductors go into saturation or b) capacitors are fully charged.
3. "Standard" PFC architectures tend to use a boost converter topology rather than a SEPIC one. In either case the buffer capacitor value is critical as it has to buffer the load during the zero-crossing of the input voltage where the energy available is lower than the energy to be delivered.
Good luck
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