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This paper proposes a Secondary distribution (single phase) nine -level inverter for gridconnected photovoltaic systems, with a novel pulse width modulated (PWM) control scheme. F o u r reference signals that are identical to each other with an offset that is equivalent to the amplitude of the triangular carrier signal were used to generate the PWM signals. The inverter is capable of producing nine levels of output-voltage levels (V dc , 3V dc /4, V dc /2,Vdc/4, 0, Vdc/4) from the dc supplydoi:10.9790/1676-0636168 fatcat:bahpxrtblvdx5kc5fursykd5wi