Simulation based Analysis of Transformerless Photovoltaic Inverter Topologies for Reactive Power handling Capability
Suganthi Ramasamy (Government College Of Technology,Coimbatore)
Z. Ahmad (TU Delft - Photovoltaic Materials and Devices)
Bindu Bindu (IREDA, ltd)
Jose Luis Rueda Torres (TU Delft - Intelligent Electrical Power Grids)
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Abstract
This study investigates the reactive power generation capability of the existing transformerless Photovoltaic Inverter Topologies (PVIT) with their conventional switching strategies. The topologies such as H5, families of H6 (H6, H6-I, H6-II, H6-III and H6-IV), HERIC, and clamped topologies (optimized H5, passive clamped H6 and HBZVR) have been selected for analysis. Matlab/Simulink simulation platform is employed for the analysis of PVIT. It has been observed that transformer-less PVIT with their conventional switching strategies are not suitable for reactive power injection. These topologies are generating highly distorted current at zero crossings during the reactive power flow. The improved switching strategies are needed to make these topologies suitable for the reactive power applications without any modification in the structure of the inverter.