Optimizing grid-tied photovoltaic inverters with MPPT and neutral point voltage balancing technique

In advancing renewable energy, the efficiency of photovoltaic grid-tied inverters has become crucial. This research proposes a Solar PV inverter integrated with control strategies and modulation techniques, aimed at maximizing power output and enhancing dynamic performance. Firstly, precise guidance in perturbation direction under varying conditions is proposed by employing the Incremental Conductance (INC) method for MPPT. Meanwhile, the efficiency of the boost converter with Pulse Width Modulation (PWM) control is highlighted. Secondly, Space Vector Pulse Width Modulation (SVPWM) is used to demonstrate its potential in maximizing output voltage amplitude while simultaneously minimizing voltage conversion losses. Thirdly, the synchronization with grid voltage frequency is confirmed by implementing the Phase-Locked Loop (PLL) and D-Q Transformation in system control. Finally, the significant role of neutral voltage balancing in the T-type inverter is emphasized, illustrating the system's robustness and precision. The simulation results show the distinct waveform of SVPWM's reference voltage, coupled with a 1.6% THD.