Elimination of DC Current Injection from a Single-Phase Grid Inverter
Single-phase voltage source inverters are used for
connecting small scale renewable energy sources to the low
voltage distribution network. They operate to supply the network
with sinusoidal current. If output transformers are not used,
these inverters must prevent excessive DC current injection,
which may cause detrimental effects in the network. In this
study, the causes of DC current injection in a common inverter
topology used are analyzed. A measurement circuit of the DC
current component is proposed which is then used to control the
inverter for the objective of DC current injection elimination.
Characteristics of the proposed method are illustrated using
simulation and experimental results.
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