Abstract
Grid-connected full bridge inverters typically have a bulky electrolytic dc capacitor to absorb the unbalanced power from the ac side. The electrolytic capacitors are vulnerable and normally have shorter lifetime than other components in the converter. In most full-bridge inverter applications, the dc voltage is required to be relatively constant. However, in reactive power compensation applications, such as solid-state variable capacitor (SSVC), the constant dc-bus voltage is unnecessary since the dc bus is floating. This paper proposes a three-phase dc capacitor-less SSVC, which removes the electrolytic dc capacitor from the circuit by releasing the constraints on dc bus voltage fluctuation. The dc voltage is supported by ac side voltage directly. The remaining dc capacitance has a value of only 3% compared to that of the conventional three-phase SSVC. The proposed three-phase dc capacitor-less SSVC is validated by simulation.
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