Hybrid Wind- Solar PV System with Auto Grid Switch Control

Hybrid wind-solar DC bus feeding a unipolar SPWM inverter with automatic grid switching when output drops below 90% of 230Vfor stable supply

This Simulink model implements a hybrid wind–solar power conversion system supplying a single-phase AC load. A three-phase wind generator feeds a diode bridge rectifier to produce DC power. In parallel, a solar PV array is connected through a DC–DC boost converter to raise the PV voltage to the common DC-link level.

The rectified wind output and boosted PV output are tied to a shared DC bus, forming a unified hybrid DC source. This DC link then feeds a single-phase full-bridge inverter using unipolar sinusoidal PWM (SPWM) to generate a 230 V, 50 Hz AC output suitable for an isolated load.

An automatic source-selection feature is included: if the inverter output voltage drops below 90% of the 230 V reference, the system seamlessly transfers the load to the grid supply; when the hybrid renewable output recovers above the 90% threshold, the load switches back to renewable operation. This provides simple voltage-based management of renewable availability and ensures uninterrupted power delivery.

Key features included in the model:

• Three-phase AC wind source with diode bridge rectifier

• Solar PV array with DC–DC boost converter feeding the same DC link

• Parallel hybrid DC bus combining wind and solar contributions

• Automatic switching between renewable supply and grid supply based on output voltage level

• Single-phase full-bridge inverter with unipolar SPWM control

• 230 V RMS, 50 Hz AC output for R or RL load

• Scopes for wind AC, rectified DC, PV and boost outputs, DC-link voltage, inverter output, grid operation status, and load waveforms