I was working on LCC HVDC line integrated between two area networks. During steady state analysis ,the bipolar HVDC is perfectly working and transfer equal power to the inverter. But during RMS simulation, the current as well as the power fast to come to zero .This may be the problem of VDCOL in the negative pole. So, how can I write the DSL model for VDCOL to correct my work. I need any one who can share his idea. I appreciate that!

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