With the increasing penetration of renewable energies as distributed generation

(DG) in smart grid scheme, technical problems arise in both distribution and transmission

system level. Undesirable voltage is the main problem for connection of

DGs in distribution systems while excessive reactive power demand transmission

system is the major concern for Transmission System Operators.

The low power generation capacity of DER (Distributed Energy Resources) has

motivated the need for integration of different types of DERs and loads in the form

of micro-grid to enhance the power generation capacity, reliability and marketability

of dispersed type of micro-sources [12, 13]. Current harmonics and Reactive power

consumption are the two power quality issues that are addressed in this thesis-With the increasing penetration of renewable energies as distributed generation

(DG) in smart grid scheme, technical problems arise in both distribution and transmission

system level. Undesirable voltage is the main problem for connection of

DGs in distribution systems while excessive reactive power demand　transmission

system is the major concern for Transmission System Operators.

The low power generation capacity of DER (Distributed Energy Resources) has

motivated the need for integration of different types of DERs and loads in the form

of micro-grid to enhance the power generation capacity, reliability and marketability

of dispersed type of micro-sources [12, 13]. Current harmonics and Reactive power

consumption are the two power quality issues that are addressed in this thesis