More and more attention is paid to the negative sequence current compensation ability of SATCOM due to wide existence of asymmetry load. However

there is at present a lack of a suitable high-voltage negative-sequence current generator for its performance test. In this paper

a kind of high-voltage cascade negative-sequence current generator is proposed and the dc-voltage unbalance between different phases under negative-sequence current output is analyzed. It is shown by the theoretical analysis the reason for this phenomenon is due to active power formed by the negative-sequence current and positive-sequence voltage in the single phase bridge arm and

on this basis

zero-sequence voltage is obtained by PI control in accordance with voltage difference between phases is proposed so to achieve the control strategy of negativesequence current output. Finally

the control strategy is verified by the set 20 kvar cascade negative sequence current generator test platform and the effectiveness of the control strategy is verified by the test result.