Hysteresis　inverters　are　used　in　many　low　and　medium　voltage　utility　applications　when the inverter line current is required to track a sinusoidal reference within a specified error margin.　Line　harmonic　generation　from　those　inverters　depends　principally　on　the particular　switching　pattern　applied　to　the　valves.　The　switching　pattern　of　hysteresis inverters is produced through line current feedback and it is not pre-determined unlike the case,　for　instance,　of　Sinusoidal　Pulse-Width　Modulation　(SPWM)　where　the　inverter switching　function　is　independent　of　the　instantaneous　line　current　and　the　inverter harmonics can be obtained from the switching function harmonics.