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Hvdc transmission system
- 1. Presented by: Guided by: Vinay Vishwakarma Er. Gaurav Kumar Mishra Yogesh Mishra Head of Electrical Engg. Devesh Pandey Ashish Tiwari Ravi Mishra Amit Shukla Department Of Electrical Engineering 6th Semester
- 3. 1. INTRODUCTION 2. HISTORY OF HVDC 3. PROCESS DIAGRAM 4. THE LINK BETWEEN RIHAND TO DADRI SUBSTATION 5. COMPONENT USED 6. WHY HVDC IS NECESSARY OVER AC 7. LIMITATION OF HVDC 8. APPLICATION OF HVDC 9. THE FUTURE PROSPECTS 10. CONCLUSION
- 4. • A high-voltage, direct current (HVDC) electric power transmission system uses direct current for the bulk transmission of electrical power. • For long-distance transmission, HVDC systems may be less expensive and suffer lower electrical losses. • High voltage is used for electric power transmission to reduce the energy lost in the resistance of the wires. • Recent developments in conversion equipment have reduced their size and cost and improved their reliability. • The major components of a HVDC transmission system are converter stations where conversion from AC to DC and from DC to AC are performed.
- 5. • Firstly HVDC between Swedish and Gotland in 1954. • In North America, total HVDC transmission capacity in 1987 was 14,000MW. • First HVDC is commissioned in India in 1990 at Rihand to Dadri(near Delhi). • Distance between stations is 814 km. • It transfer the power at ±500 KV and 1500 MW.
- 7. 6V/12V---12V AC to 12V DC—transmission– 12V DC to 12V AC--- 12V/6V– sub transmission– 6V/3V--- distribution and lightning.
- 8. • Converter Transformer Step up Transformer ( at Generation Station). Step up Transformer (at Substation). Step down Transformer (at Distribution). • Rectifier is a static device which converts AC into Pulsating DC voltage. • Filter is used to make the ripple free supply (pure DC). • Invertor is a static device which converts DC into AC voltage with desired frequency. • Power LEDs is used for lightning a plant.
- 9. The reasons for selecting HVDC instead of HVAC are :- 1. Lower cost at operating condition. 2. Lower transmission losses. • As only two conductor are required in HVDC hence I2R losses are low for same power transfer. 3. Cheaper in cost. • Require two wire for transmission but AC needs Three wire. • Size of Pole, Insulators, Cross Arm are to be reduced. • The phase to phase clearance, phase to ground clearance and tower size are smaller in case of DC transmission. 4. Asynchronous interconnections. • A DC link can be used to inter-connect two AC systems of different frequency.
- 10. 6. No Skin effect: There is no skin effect in DC, because skin effect is directly proportion to frequency and hence there is uniform distribution of current over the cross-section of the conductor. 7. Better voltage regulation. • Because there is no inductance and capacitance therefore voltage regulation is 0%. 7. Absence of charging current. 8. Low short circuit currents. 9. Direct Current saves forest and lands.
- 13. 1. Costly terminal equipments. • The convertors required at both the ends are more expensive. • The convertors produce a lot of harmonics both on DC and AC sides and may cause Radio Interference. • To remove ripples from the DC output, filtering & smoothening equipments are to be provided. 2. More maintenance of insulators is required in HVDC system. 3. Complexity of control. 4. Voltage transformation is not easier in case of DC system.
- 14. 1. For long distance high power transmission. 2. For interconnection (tie lines) between two or more AC systems having their own load frequency control. 3. For back to back asynchronous tie substation where two AC systems are interconnected by a convertor substation without any AC transmission line in between. 4. For underground or submarine cable transmission over long distances at high voltage.
- 15. There are the following future aspects of the project as: 1. The complete system from generation to distribution is in the from of DC i.e. possible by using power electronics circuits. 2. By using DC Choppers in place of transformers, we have resolved complete system into DC system.
- 16. • Availability of non- renewable resources is limited. • HVDC is used for increasing the efficiency of transmission lines. • Dependency of source from foreign countries are to be reduced. • HVDC transmission line gives the Reliable, Economical and Stable supply as compares to AC.
- 17. ANY QUERY……