Adaptive Maximum Power Point Tracking and High-Frequency Sinusoidal Pulse Width Modulation Single-Phase Inverter for Standalone Photovoltaic Systems
Year: 2026
Type: conference-paper
Abstract: This paper presents a single-phase inverter for a standalone photovoltaic module developed in 2025 and proposes an innovative combination of adaptive MPPT based on variable-step P&O, high-frequency SPWM modulation, and optimized filtering and protection to improve stability and reduce losses. Numerical verification was carried out for irradiance levels from 400 to 1000 W/m2 and temperatures from 0 to 50 °C. As irradiance decreases from 1000 to 400 W/m2, the short-circuit current falls from approximately 9.4 to 3.8 A, whereas the open-circuit voltage remains nearly constant at about 39–40 V, and the knee of the I–V curve is calculated to be in the 30–32 V region. As temperature rises from 0 to 50 °C, the maximum power decreases from about 300 to 240 W, while the MPP voltage shifts from approximately 33–34 V to 29–30 V. In the MPPT test, when irradiance drops from 1000 to 600 W/m2 at t ≈ 5 s, the output power decreases to about 160 W. When the temperature increases from 25 °C to 45 °C at t ≈ 8 s, a short-term dip to about 130–140 W is observed, followed by recovery to approximately 145–150 W. The adaptive algorithm reaches steady-state operation within about 0.3–0.5 s. The inverter operating with 20 kHz SPWM produces a 50 Hz output, and after filtering, the voltage amplitude remains within approximately +140 to +150 V and −140 to −150 V over the 20–80 ms interval, confirming an acceptable output waveform for a standalone load.
Institution: Al-Farabi Kazakh National University
Language: English
Field: Energy
Domain: Physical Sciences
Open Access status: hybrid
OpenAlex ID: W7225168880