Harmonic control and losses of a current source GTO invertersupplying load with AC generation

The use of a self-commutated current-source inverter for supplying a remote load with no AC system support is investigated. Various forms of pulse width modulation (PWM) techniques are studied with particular emphasis placed on the control of harmonics and losses in the GTO valves and filters. A novel switching technique is presented which reduces the magnitude of harmonics while maintaining low switching losses in the inverter. It is shown that the proposed switching pattern can improve the inverter operation and has the potential of reducing harmonics without increasing switching frequency or the cost of filters or losses