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HVDC pros and Cons.ppt

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HVDC pros and Cons.ppt

  1. 1. EE-504.24 1 OBJECTIVES • Advantages of HVDC transmission systems. • Disadvantages of HVDC Transmission System. • Applications of HVDC transmission systems.
  2. 2. EE-504.24 2 •The main advantages of HVDC transmission system Advantages of HVDC Transmission system • Simple in line construction •Ground can be used as return conductor. •No charging current. •Less corona and radio interference. •No skin effect. •Bulk power can be transmitted over long distances. •Synchronous operation is not required. •Tie-line power can be easily controlled.
  3. 3. EE-504.24 3 The main advantages of HVDC transmission system •Power transmission can be also possible between unsynchronized AC distribution systems(Interconnection of A.C systems of different frequencies). •Cables can be worked at high voltage gradient.
  4. 4. EE-504.24 4 • It is very difficult to break the D.C currents hence it requires high cost of D.C circuit breakers. • Not possible to use transformers to change the voltage levels. • Cost of conversion equipment is very expensive. • Due to the generation of harmonics in converters it requires AC& DC filters, hence the cost of converting station is increased. • Complexity of control. • Converters have little over load capability. Disadvantages of HVDC Transmission system
  5. 5. EE-504.24 5 Applications of HVDC Transmission Systems •Long distance bulk power transmission by overhead lines. Interconnection of AC systems operating at different frequencies. Back-to-Back HVDC coupling stations. MTDC asynchronous interconnection between 3 or more AC network. Control & stabilization of power flows in AC interconnection of large interconnected systems.

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