Multilevel hysteresis modulation (MHM) for sliding mode controlled dual inverter PV systems.In this article, proposes an adaptive multiband hysteresis modulation and its characterization based on a robust nonlinear sliding-mode control (RNSMC) strategy of a dual two-level inverter topologies for photovoltaic (PV) system subject to robust and fast-tracking characteristics and external disturbance rejection.  Using the RNSMC based novel, vector control schemes are designed and implemented to improve its robustness and against the rejection of external disturbances. 
RNSMC
Tsypkin's method is used to realize the switching frequency characterization. 
Tsypkin's method