Modified Quasi-Steady State Model of DC System for Transient Stability Simulation under Asymmetric Faults

Table 6

Steady state DC values and errors during the 100 ms double phase-grounded fault for QSS and MQSS models.

Double phase-grounded; resistance ()	Parameters	EMT model (pu)	QSS model (pu)	Modified model (pu)	Relative error of; QSS model (%)	Relative error of; modified model (%)
60		0.6500	0.8500	0.7470	30.77	14.92
		0.4800	0.7400	0.6217	54.17	29.31
		0.4750	0.7250	0.6380	52.63	34.32
80		0.7050	0.8840	0.7069	25.39	0.27
		0.5700	0.7790	0.5733	36.67	5.79
		0.5750	0.7800	0.6424	35.65	11.72
100		0.7900	0.9200	0.8104	16.46	2.58
		0.6500	0.8000	0.6486	23.08	0.22
		0.6520	0.8150	0.6623	25.00	1.58