Nonlinear Control of Back-to-Back VSC-HVDC System via Command-Filter Backstepping

Table 1

The main parameters of BTB VSC-HVDC.

Parameters	Value
Equivalent resistances and	40 mΩ
Equivalent inductances and	6 mH
DC-link capacitor	4000 μF
Nominal net DC voltage	60 kV
Each AC system nominal voltage	138 kV
Each transformer voltage ratio	138 kV/30 kV(Y/Δ)
Nominal frequencies	50 Hz
Nominal frequencies	60 Hz
Switching frequency	10 kHz