High Voltage Direct Current HVDC part 1
High Voltage Direct Current HVDC system is a link between two A.C system and consist of “Rectifying and Inverting Stations ” interconnected by a transmission O/H Line or cables or combination also at each end of the transmission line filter is provided for many reasons
1. To smooth the D.C transmission
2. Provide Continous flow of current
3. Supress Harmonics
4. Increase stability of the system
5. Limit the rise of current after fault period
# The system may have :
1- Single conductor with Ground Return
2- Two conductors with system with one earth only
3 – Two conductor Systems with mid-point earthed
