SIMPLE TOPOLOGIES FOR SINGLE-PHASE AC LINE CONDITIONING

This paper presents a variety of single phase ac line conditioning app roaches. The topologies use a minimal number of devices and feature bu ck-boost voltage regulation capability without a transformer, while pr eserving a neutral connection which is common with the input ac line. The simplest form of the converter is seen to be a ac voltage regulato r with output voltage range of 0-2 p.u. with reasonable line current w aveforms. Modifications allow the circuit to operate with fully contro lled input current. The circuit can be further extended to provide sig nificant ride-through capability without using a battery. Finally, a f ull function single phase UPS can also be realized if required. The pa per contains analytical, simulation and experimental results.