Abstract
Transformer-less (TL) inverter topologies have elicited further special treatment in photo-voltaic (PV) power system as they provide high efficiency and low cost. Neutral point clamped (NPC) multilevel-inverter (MLI) topologies-based transformer-less are being immensely used in grid-connected medium-voltage high-power claims. Unfortunately, these topologies such as NPC-MLI, full-bridge inverter with DC bypass (FB-DCBP) suffer from the shoot-through problem on the bridge legs, which affect the reliability of the implementation. Based on the previous above credits, a T type neutral point clamped (TNP)—MLI (TNP-MLI) with transformer-less topology called TL-TNP-MLI is presented to be an alternate which can be suitable in the grid-connected PV power generation systems. The suggested TL-TNP-MLI topologies free from inverter bridge legs shoot-through burden, switching frequency common-mode current (CMC), and leakage current. The control system of the grid interface with hysteresis current control (HCC) strategy is proposed. The effectiveness of the proposed PV connected transformer-less TNP-MLI topology with different grid and PV scenario has been verified through the MATLAB/Simulink simulation model and field-programmable gate area (FPGA)-based experimental results for a 1.5 kW system.
Highlights
Renewable energy sources (RES) are a current asset for the electric power generation
The hysteresis current controls (HCCs) have precise tracking competence to track the inverter current with the grid voltage to ensure unity power factor (PF) and current waveform quality [31]
The proposed grid-connected TL-type neutral point clamped (TNP)-MLI interface is investigated with HCC to verify zero iL
Summary
Renewable energy sources (RES) are a current asset for the electric power generation. Any PV connected high-frequency inverter/converter suffers from a high leakage current which emanates from the PV system [3,4]. To avoid this problem, a low-frequency isolated transformer is directly associated in the middle of the PV-tied inverter and grid. By overcoming the transformer usage issue, researchers have proposed different PV-powered transformer-less (TL) inverters for PV-tied grid-connected power system for both single and three phases [5,6,7]
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