Enhancement of Solar PV Panel Efficiency Using Double Integral Sliding Mode MPPT Control

This paper proposes an extraction of maximum power from the solar panels, using the sliding mode control scheme, becomes popular for partial weather atmospheric conditions due to its effective dynamic duty cycle ratio. However, the sliding mode control scheme was sophisticated with single integral and double integral sliding mode control scheme, which offer enhanced maximum power extraction and support enhanced solar panel efficiency in partial weather conditions. The operation of the sliding mode control scheme depends on the selection of a sliding surface selection based on the atmospheric weather condition, which enables the effective sliding duty cycle ratio operation for the DC/DC boost converter. The duty cycle ratio of the sliding mode control resembles the usual dynamic behavior to achieve enhanced efficiency compared to the various maximum power point tracking (MPPT) schemes. The major limitation of the sliding mode control scheme is to achieve the steady state voltage error of the solar panel in minimum settling time duration. The single integral sliding mode control scheme achieves the expected steady state voltage error limit but fails to achieve minimum settling time duration. Hence, the single integral sliding mode control is extended to a double integral sliding mode control scheme to achieve both steady state voltage error limits within the minimum settling time duration. This double integral sliding mode control scheme allows us to obtain the higher sliding surface duty cycle ratio which acts as the input signal to the boost converter. This activates the enhanced stable and reliable system operation, and nullifies the lacuna of maximum solar panel efficiency under partial weather conditions. Hence, this paper aims to present the design and performance operation of the double integral sliding mode (DISM) MPPT control scheme. To validate the performance analysis of the proposed DISM MPPT control scheme, the MATLAB/Simulink model is designed and verified. Also, the performance analysis of the proposed DISM MPPT control scheme is compared with the sliding mode controller (SMC) scheme and single integral sliding mode controller (SISMC) scheme. The performance analysis of the proposed double integral sliding mode controller (DISMC) scheme attains 99.10% of efficiency and a very less settling time of 0.035 s when compared to other existing methods.

Keywords: Maximum power point tracking (MPPT) schemes, sliding mode controller (SMC), double integral sliding mode controller (DISMC), pulse width modulation (PWM), photovoltaic (PV) system.