Fulwani, Deepak M

The single-stage DC–AC converters are capable of boosting the DC voltage and conversion to AC by incorporating the shoot-through state between the dead time intervals of traditional inverters. However, these suffer from second-order voltage and current reflections at the DC input side. The paper proposes a sliding mode control (SMC) based control of single-stage inverters. The proposed control is used to reduce second-order ripples currents (SRCs) by inductor impedance shaping which significantly reduces SRC propagation to the source. This improves the life span of source and converter components without any external ripple reduction circuitry. The proposed methodology is applied to two topologies-Quasi-ZSI, and Embedded Switched Boost Inverter. The proposed method is verified by simulation and experimentation.

This chapter discusses two methods of designing a sliding surface in the face of an actuator saturation constraint for a class of nonlinear uncertain systems. The first approach uses an ARE based approach to design the sliding surface and the second approach uses the parametric Lyapunov equation to design the surface. These methods are based on the low gain approach proposed by Lin et al. The design methods give a surface matrix as a function of the designed parameter. This parameter can be modulated to reduce the control amplitude which ensures that the control limits are respected in a region of the state space. This region can be made sufficiently large by choosing appropriate values of the design parameter. © Springer-Verlag Berlin Heidelberg 2013.