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# Sliding Mode Controller Based P&O MPPT for Solar PV System

## Sliding Mode Controller Based P&O MPPT for Solar PV System

This model tests the Sliding Mode Controller based P&O MPPT algorithm for a solar PV system. It consists of:

• 250W PV Panel

• Open Circuit Voltage: 37.3V

• Voltage at Maximum Power Point: 30.7V

• Short Circuit Current: 8.66A

• Current at Maximum Power Point: 8.15A

### PV Panel Characteristics

The IV and PV characteristics of the 250W PV panel vary with different irradiation conditions. For example:

• 1000 W/mÂ²: Peak power ~ 250.2W

• 800 W/mÂ²: Peak power ~ 199.9W

• 600 W/mÂ²: Peak power ~ 149.6W

The peak point varies based on the irradiation level and is extracted using the MPPT algorithm.

### Boost Converter Design

The PV panel is connected to a variable load via a boost converter. The design of the boost converter (inductor and capacitor values) depends on:

• PV Power (250W)

• Voltage across the PV panel (30.7V at standard test conditions)

• Desired Output Voltage (e.g., 60V)

Based on these values and the inductor ripple current percentage and capacitor voltage ripple percentage, the values for L and C are determined.

## Sliding Mode Controller Based P&O MPPT

The P&O MPPT algorithm provides a reference voltage based on the measured PV voltage and current. The reference voltage helps in extracting maximum power from the PV panel.

### Control Logic

The control logic combines the P&O method with the sliding mode control concept, thus forming the Sliding Mode Controller based P&O MPPT algorithm.

## Simulation Results

The model is tested with a constant load and varying irradiation every 0.2 seconds (1000, 800, 600, 400 W/mÂ²). The results are as follows:

• 1000 W/mÂ²: Max power ~ 250W

• 800 W/mÂ²: Max power ~ 200W

• 600 W/mÂ²: Max power ~ 150W

The PV voltage, load voltage, PV current, load current, PV power, and load power are recorded for these varying conditions.

The model is tested with a constant irradiation and varying load every 0.3 seconds.

• Load current changes from ~2.8A to ~3.5A.

• PV power is maintained at the maximum power point (250W for 1000 W/mÂ²).

The variations in PV voltage, load voltage, PV current, and load current are observed for changing load conditions.

## Conclusion

The Sliding Mode Controller based P&O MPPT effectively extracts maximum power from the PV panel under varying irradiation and load conditions.