Design And Fault Analysis Of EHV HVDC Transmission Line Using MATLAB Simulink

PRESENTED BY SHUBHAM BODADE GUIDED BY PROF. ATUL DAHANE DEPARTMENT OF ELECTRICAL AND ELECTRONICS ENGINEERING PROF RAM MEGHE COLLEGE OF ENGINEERING AND MANAGEMENT BADNERA

  Introduction    MATLAB   Components of HVDC    Design    Advantages    Disadvantages    Application    Installation    Conclusion    Reference 

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  Tra Trans nsm mit itti ting ng po powe werr ov over er lo long ng di dist stan ance ces s by ov over erhe head ad transmission lines or submarine cables at high voltage and in DC form instead of AC is a new technology proven to be economic and simple in operatio n which is HVDC transmission.  Since our primary source is A.C.,the three basic steps are:-

1.  Convert

AC into DC (rectifier)

2.  Transmit 3.

DC

Convert Conve rt DC into AC (inve (inverter) rter)

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MATLAB (matrix laboratory) is a multi-paradigm numerical computing environment and fourthgeneration programming language. MATLAB allows matrix manipulations, plotting of functions and data, implementation of algorithms. By using MATLAB, we can construct a model, select the different components from Simulink library, connect them, set the time period, and start Simulation.

Converter Station Wind Power

AC Transmission Line

HVDC

Inverter Station

Transmission Line

AC Transmission Line

Distribution Line

1) 2) 3) 4) 5) 6) 7)

Converters Smoo Sm ooth thin ing g rea react ctors ors Harmo Ha rmoni nicc fil filter terss Reac Re acti tive ve po powe werr so sour urce ce Electrodes Dc lines Ac ci circ rcui uitt br brea eake kers rs

CONVERTERS

Perform AC/DC (rectifier) and DC/AC (inverter) conversion consist of bridges and transformers

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SMOOTHING REACTORS

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Decrease harmonics in voltages and currents in DC lines. Prevent current from being discontinuous . HARMONIC FILTERS

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Used to reduce harmonics (in voltages and currents) caused by converters which generate harmonics, Hence prevent from interference with any system.

REACTIVE POWER SUPPLIES 

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Converter may consume reactive power of about 50% / more of active power. Reactive power is, therefore, provided near converter. For a strong AC power system, this reactive power is i s provided by a shunt capacitor. ELECTRODES Used to provide connection to the earth for neutral.

DC LINES They may be overhead lines or cables. DC lines are very very similar to AC lines. CIRCUIT BREAKERS

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Used to break circuit if fault occurs in the transformer and for taking the t he DC link out of service.

Advantages of HVDC

Technical Advantages

Economic Advantages

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Lesser Corona Loss and Radio interference.

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No skin and proximity and ferranti effect.

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More power per conductor.

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DC lines and cables are cheaper than AC lines or cables. The towers of the DC lines are narrower, simpler and cheaper compared to the towers of the AC lines.

Line losses in a DC line are lower than the losses in an AC lines.

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The disadvantages of HVDC are in conversion, switching, control, availability and maintenance. Difficulty in stepping up/down voltage. No dc transformer. The required converter stations are expensive and have limited overload capacity. Converters need large reactive power.

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Long distance high power transmission by overhead lines. Medium and long high power submarine or underground cables. Frequency conversion (60 Hz – 50Hz ; 50Hz – 25Hz).

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Chandrapur – Padghe HVDC transmission system (Leeng (L ngth th - 75 7522 km km,, Pow Power er ra rati ting ng - 1, 1,50 5000 MW MW,, DC DC voltage - ±500 kV) Talcher–Ko Kola larr HVDC HVDC sys syste tem m (Leng (Length th - 1, 1,45 4500 km km,, Powe Po werr ra rati ting ng - 20 2000 00 MW, DC vo volt ltag agee - ±5 ±500 00 kV kV)) Rio Madeira HVDC system from Porto Velho to Arar Ar araq aqua uara ra (Le (Leng ngth th - 2, 2,37 3755 km km,, Powe Powerr rati rating ng - 2 x 3150 31 50 MW, DC voltag agee - ±60 6000 kV kV))

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HVDC offers powerful alternative to increase stability of a power system, with it power flow can be controlled rapidly and accurately. Use of HVDC to interconnect two points in a power grid, in many cases is the best economic alternative and further more it has excellent environmental benefits. Very large investment for example in China and India shows that HVDC very important in future especially in big, new industrial countries.

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PAPER HVDC and FACTS Controllers, Vijay. K. Sood, USA, Kluwer Academic Publishers, 2004. AC 2009-293 : Introducing high-voltage direct-current transmission into an undergraduate power-system course.

BOOKS EHV-AC, HVDC Transmission & Distribution Engineering by S. RAO

WEBSITES https://www.mathworks.com https://www.electrical4u.com http://www.ieee.org