An improved robust coupled sliding mode control strategy for solar photovoltaic‐based single‐phase inverters

Abstract

SummarySolar photovoltaic (SPV)‐based single‐phase inverters are universally accepted and commercially utilized renewable power converter system. Generally, the magnitude of the inverter output is perturbed on load variations, and the intermediate DC‐DC boost converter output is perturbed because of the solar availability. The main intermediary component is the DC‐Link capacitor. The regulation of DC‐Link voltage is the key factor in maintaining the stability of the system with bilateral power converters. In the existing methods, individual Sliding Mode Control (SMC) are used to maintain the stability of the converters independently. However, the individual SMC's do not have any corelated control to address the common problem of DC‐Link voltage regulation. This paper proposes an alternative solution with Coupled SMC (CSMC) to address the problem of regulating the DC‐Link voltage. Both the Boost‐SMC and Inverter‐SMC are individually developed and controlled in a unified approach by having mutual adjustments in the converter and inverter switching pulses. The CSMC strategy is developed in Matlab and experimented using dSPACE‐MicrolabBox. The validation tests are compared with conventional SMC, which shows the betterment of CSMC in robustness and waveshape tracking.