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International Journal Of Electrical, Electronics And Computers(IJEEC)

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  3. Vol-10,Issue-2, March - April 2025
  4. Design a Novel Neutral Point Clamped Inverter Without AC booster for Photo-voltaic System

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Design a Novel Neutral Point Clamped Inverter Without AC booster for Photo-voltaic System

Bharat Modi, Suman Sharma, Jinendra Rahul, Jitendra Singh, Garvit Gupta, Yusuf Sharif


International Journal of Electrical, Electronics and Computers (IJECC), Vol-10,Issue-2, March - April 2025, Pages 9-16, 10.22161/eec.102.2

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Article Info: Received: 29 Mar 2025; Accepted: 19 Apr 2025; Date of Publication: 25Apr 2025

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AC booster photovoltaic (PV) inverters are increasingly favored in grid-connected solar installations for their compact structure and enhanced efficiency. However, conventional AC booster designs often face issues with fluctuating common-mode voltage (CMV), which contributes to elevated common-mode leakage current (CM-LC) due to the absence of galvanic isolation. These challenges can negatively impact overall system performance, safety, and conformity to grid regulations. In response to these concerns, this work presents a novel Neutral Point Clamped (NPC) inverter configuration named the H6-Diode (H6-D) topology. This approach combines the low-loss switching capability of AC bypass techniques with a mechanism to effectively suppress CM-LC. A key feature of the topology is a clamping circuit that limits the freewheeling voltage to half of the DC-link level, thereby reducing leakage currents significantly. The design's validity is confirmed through detailed simulations conducted in MATLAB/Simulink and supported by experimental trials using a developed laboratory prototype.

AC booster, Common mode voltage, Leakage current, Non-NPC, NPC inverter, Total harmonic distortion, Efficiency.

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