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

Table 4

Steady state DC values and errors during the 100 ms single phase grounding fault for QSS and MQSS models.

Single phase grounding; resistance (Ω)	Parameters	EMT model (pu)	QSS model (pu)	Modified model (pu)	Relative error; of QSS model (%)	Relative error of; modified model (%)
0		0.5500	0.6000	0.5481	9.09	0.34
		0	0.4267	0.1954	—	—
		0.0507	0.4600	0.1843	807.30	263.51
10		0.5820	0.7338	0.5512	44.81	5.29
		0.2929	0.5925	0.3331	102.29	13.72
		0.3000	0.6139	0.3440	104.63	14.67
20		0.6823	0.8426	0.7164	23.49	5.00
		0.5400	0.6929	0.5846	28.31	8.26
		0.5600	0.7360	0.6001	34.73	7.16