Comparative Analysis of PV fed VSI, CSI and ZSI based UPQC for Mitigation of Voltage Sags and Harmonics

Prasad Miska, Ashok Kumar Akella


This paper presents, a solar photovoltaic (SPV) fed three inverter configurations of Unified Power Quality Conditioner (UPQC) for mitigation of power quality events such as voltage sags and harmonics with a switching of a capacitor bank. The three inverter configurations are photovoltaic fed voltage source inverter based (VSI) UPQC (PV-VSI-UPQC), photovoltaic fed current source inverter (CSI) based UPQC (PV-CSI-UPQC), and photovoltaic fed impedance source inverter (ZSI) based UPQC (PV-ZSI-UPQC). The unit vector template (UVT) control technique is used to produce the reference voltage and current signals and control the operation of SPV fed ZSI-UPQCs. A novel hybrid technique also proposed for optimum maximum power point tracking (MPPT) with the combination of perturbation and observation (P&O) and incremental conductance (InC) techniques. The response of SPV fed ZSI-UPQC for mitigation of supply voltage sags and harmonics are investigated and compared with SPV fed VSI-UPQC and SPV fed CSI-UPQC.

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Power quality; Voltage sag; UPQC; Photovoltaic; Impedance source inverter

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