Comments on minimisation of uncharacteristic harmonics in HVDC convertors through firing angle modulation [and reply]

For original paper see ibid., vol.137, no.1, p.45-52 (1990). The authors find that the original paper should provide an insight into the technique of minimisation of uncharacteristic harmonics in HVDC convertors through firing angle modulation. They point out some minor anomalies and look at a recent application of this kind of technique. The authors of the original paper reply by commenting and solving problems found