a high-voltage, direct current (hvdc) electric ... - weebly
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A high-voltage, direct current (HVDC) electric power transmission
system uses direct current for the bulk transmission of electrical power,
in contrast with the more common alternating current systems
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WHY HVDC?Reduces energy losses due to the
resistance of transmission lines
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• Cheaper over long distances (sustainable energy generation sites are usually far away from consumption)
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• Electricity can be imported (Pakistan’s salvation)!!!!
•
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•Doesn’t generate reactive power
•No synchrony demands (the stations can even be at different frequencies , so buffer is created between the two systems)
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• Only two conductors are needed instead of three as used in AC so cost of transmission reduced.
• Increasing the capacity of an existing power gridin situations where additional wires are difficult or expensive to install
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• More power transmitted since HVDC does not suffer from the skin effect. (No need for STRANDED conductors!!!)
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• Undersea cables, where high capacitance causes additional AC losses. (e.g., 250 km Baltic Cable between Sweden and Germany
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Two types of HVDC
transmission
•Conventional HVDC
•VSC-HVDC
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•No risk of commutation failures in VSC
•VSC can connect to weak or dead AC networks
•Faster response of VSC due to high switching frequency
•Minimal environmental impact
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ELECTRICAL FAULT!!!
OR
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PERFORMANCE ANALYSIS OF A VSC
TRANSMISSION SYSTEM UNDER FAULTED
CONDITIONS
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Fundamentals of VSC
Schematic of the
interconnected VSC by a
DC link
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,
Power flows
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Phase locked loop, outer
active and reactive power
and voltage loop
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Inner Current Loop
Converting into the rotating frame gives:
and
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Rearrange the equations…
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SIMULATIONS
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Integration gives…
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SIMULATED USING
SIMULINK…
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DATA ANALYSIS AND RESULTS
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RESULTS:Step responses:
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RESULTS CONTINUED…
Station 1 Station 2
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AC Perturbations:
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- The proposed strategy has been shown to provide fast and satisfactory dynamic responses
- The simulation showed it can be used for fast and bi-directional power transfers
- During a single phase fault, transmitted power can be kept constant except a small oscillation
- During a three phase fault however, the voltage strongly reduces the power flow
- When the fault is cleared, normal operation is recovered fast
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REFERENCES
• HVDC Light: A new technology for a better environment, IEEE Review 1998
• Performance analysis of VSC based HVDC system under fault conditions, Khatir Mohammed, Amiri Rabie 2000
• Topologies for VSC transmission, Anderson 1999
• Power system stability benefits(sweden 2004)
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FUTURE??????