A DC offset removal algorithm based on AR model

Figures & data

Figure 1. Flowchart of proposed algorithm.

Table 1. Overhead transmission line parameters.

Sequence	Parameter	Value	Units
Positive & Negative	R1, R2	0.0419	Ω/km
	L1, L2	0.8799	mH/km
	C1, C2	0.0128	μF/km
Zero	R0	0.2294	Ω/km
	L0	2.6666	mH/km
	C0	0.0043	μF/km

Figure 2. Single-line diagram of model system.

Table 2. Equivalent source parameters.

`	Case 1		Case 2
Sequence	S [GVA]	X/R	S [GVA]	X/R
ZS0	5.0	10.7	5.0	15.0
ZS1	11.5	5.1	11.5	7.5
Sequence	R [GVA]	X/R	R [GVA]	X/R
ZR0	2.1	18.1	2.1	18.1
ZR1	6.4	4.9	6.4	4.9

Figure 3. Test results according to change in fault distance (fault distance: 10 [%], source impedance ratio: case 1).

Figure 4. Test results according to change in fault distance (fault distance: 50 [%], source impedance ratio: case 1).

Figure 5. Test results according to change in fault distance (fault distance: 90 [%], source impedance ratio: case 1).

Figure 6. Test results according to change of the source impedance ratio (fault distance: 0.1 [km], source impedance ratio: case 1).

Figure 7. Test results according to change of the source impedance ratio (fault distance: 0.1 [km], source impedance ratio: case 2).