Why High Voltage Direct Current?
The transmission and distribution of electrical energy started with direct current. In 1882, a 50-km-long 2-kV DC transmission line was built between Miesbach and Munich in Germany.
At that time, conversion between reasonable consumer voltages and higher DC transmission voltages could only be realized by means of rotating DC machines.
For these reasons, AC technology was introduced at a very early stage in the development of electrical power systems. It was soon accepted as the only feasible technology for generation, transmission and distribution of electrical energy.
Technical Merits of HVDC
The advantages of a DC link over an AC link are:
1. A DC link allows power transmission between AC networks with different frequencies or networks, which can not be synchronized, for other reasons.
2. Inductive and capacitive parameters do not limit the transmission capacity or the maximum length of a DC overhead line or cable. The conductor cross section is fully utilized because there is no skin effect.
3. A digital control system provides accurate and fast control of the active power flow.
4. Fast modulation of DC transmission power can be used to damp power oscillations in an AC grid and thus improve the system stability.
|Title:||High Voltage Direct Current Transmission – Proven Technology for Power Exchange – SIEMENS|
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