Hybrid Offshore-wind and Tidal Turbine (HOTT) Energy Conversion II (6-Pulse GTO Rectifier DC connection and Inverter) Mohammad Lutfur Rahman Yasuyuki Shirai Kyoto University Graduate school of energy science, Department of energy science and

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Hybrid Offshore-wind and Tidal Turbine (HOTT)
Energy Conversion II (6-Pulse GTO Rectifier DC
connection and Inverter)Mohammad Lutfur
RahmanYasuyuki Shirai Kyoto UniversityGraduate
school of energy science, Department of energy
science and technology, Yoshida honmachi,
Sakyo-ku, Kyoto- 606-8501, Japan
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Introduction

• The innovative renewable energy conversion
  system called Hybrid Offshore-wind and Tidal
  Turbine (HOTT) Conversion was proposed. The
  research includes tidal turbine and offshore-wind
  turbine, new turbine designs and, turbine control
  of tidal energy and offshore-wind energy
  absorption. HOTT will be entire five turbines,
  four turbines will be tidal turbine and one
  turbine will offshore- wind turbine arrangement.

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Offshore Wind Turbine
Where Pw is power in watts for wind turbines, Ad is air density, rw is rotor radius, Vw is wind speed, Cpw is coefficient of performance (might be changed depending on the real system) Cgw is the generator efficiency and power conditioning efficiency (might be also changed depending on the real system).
10/12/2013
Kyoto University, Graduate School of Energy
Science, Department of Energy Science and
Technology
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• it will shows that the offshore-wind turbine
  simulation output using PSCAD/EMTDC. It shows the
  active power, wind speed, torque output and AC
  voltage L-L (RMS)

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Offshore Wind Turbine
P windMW
Wwindm/s
Tmwindpu
VW-CON-L-L (RMS)kV

• Simulation results for wind turbine. Its show the
  Active power ,wind speed, output torque of the
  turbine and wind AC voltage L-L (RMS)

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• Starting point ( 0.20s) The wind generator is
  in starting up condition.
• Noise amplitude controlling parameter 1rad/s,
  number of noise components 30
• Ramp wind starts at 6sec for number of ramp 3,
  ramp period when the machine delivering 2.78 MW
  of power to the system.
• Gust wind starts at 10sec number of gust 3, when
  the machine delivering 2.68 MW of power to the
  system.
• The Power fluctuation is between 1.54 MW to 3.0MW
  Offshore-wind torque when wind speed at reference
  height 8m/s.

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Tidal Turbine
where Pt is power in watts for tidal turbines, Wd is sea water density, rt is rotor radius, Vt is sea water speed, Cpt is coefficient of performance (might be changed depending on the real system) and Cgt is the generator efficiency and power conditioning efficiency (might be also changed depending on the real system).
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• It will shows that the tidal turbine
  simulation output using PSCAD/EMTDC. Its show the
  active power, torque output, torque output form
  the turbine and AC voltage L-L (RMS).

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Tidal Turbine
PtidalMW
Wtidalm/s
Tmtidalpu
VT-CON-L-L (RMS)kV

• Simulation results for tidal turbine. Its show
  the active power, torque output of the turbine,
  torque of the turbine and AC voltage L-L (RMS).

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• Starting point ( 0.20s) The tidal generator is
  in starting up condition When generator condition
  getting 2.88 m/s tide speed, 0.87 sec the tidal
  turbine bring to the line to adjust the turbine.
• At t1.48 sec to t15 sec the speeds of the
  machine become 2.88 m/s when the power systems
  become steady condition and delivering real power
  4.11MW to 4.20MW.

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Hybrid Offshore-wind and Tidal Turbine (HOTT)
Energy Conversion II.
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• Phybrid total power in watts for hybrid turbine
  system of the tidal and the offshore-wind
  turbines
• Pt is power in watts for tidal turbines,
• Pw is power in watts for wind turbines,

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Why hybrid

• A huge coefficient of performance loss and
  distribute-energy-producing flows are low
  percentage. Thats why if only offshore-wind
  turbine must be connected with the huge capacity
  size battery for continuous flow and for power
  system steady unless wind power will be an
  unacceptable consequence that may threaten the
  power system stability.
• The tidal energy conclude that tidal stream
  capacity factors are significantly greater than
  for wind energy.

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• The integration of wind power in the
  Offshore-wind turbine system leads to minimum
  load problems at high levels of installed wind
  power capacity, in their blades has contributed
  to low rotational inertia.
• The proposed HOTT is more flexible than the
  single system, so that the stable generation
  ranges of the wind/tidal conditions can extended
  by adequate system control strategy.
• The advance simulation study have to be carried
  out to ensure stability and also gives a better
  understanding of the control aspects required to
  make it more efficient.

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• HOTT

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• 6 pulse GTO rectifier DC side connection and
  inverter configuration using PSCAD/ EMTDC

10/12/2013
Kyoto University, Graduate School of Energy
Science, Department of Energy Science and
Technology
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• A Induction Generator supplies the ac power at
  the sending end and controls the ac voltage at
  the sending end. The inverter controls the ac
  voltage magnitude, and the dc voltage. Pulse
  width modulation are employed to control the
  operation of the converters at both ends.
• The control system is designed such that the
  sending end (or the rectifier end) controls the
  amount for wind/tidal and the power transferred
  across the dc link, and the receiving end (or the
  inverter end) controls the dc voltage. So a
  constant dc power in the system , the voltage at
  the dc line should be constant.

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• It will shows the hybrid turbine simulation
  output using PSCAD/EMTDC, form top to bottom, the
  DC transmission power (PDC), AC voltage line to
  line (RMS) (VINV-AC), the converter DC voltage
  (VCON-DC) and current (ICON-DC), the inverter DC
  voltage (VINV-DC)and current(IINV-DC).

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Hybrid
PDC pu
VINV-L-L (RMS)kV

• Simulation results for GTO 6 pulse rectifier and
  inverter

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VCON-DC kV
ICON-DC pu
VINV-DC kV
IINV-DC pu

• Simulation results for GTO 6 pulse rectifier and
  inverter

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• the converter DC voltage is 0.22kV to 29kV the
  graph this happens at t0.16 sec to t0.35 sec
  when generator is in starting up condition.
• 22 kV set point DC voltage become steady- state
  at t0.51 sec to t15 sec.
• AC voltage line to line (RMS) offshore-wind
  turbine rectifier side 5.8 kV, AC voltage line to
  line (RMS) tidal turbine rectifier side 8 kV
  and inverter side AC voltage line to line (RMS)
  77 kV.
• The DC transmission line power is per unit 0.42.

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ADVANTAGE HOTT (Entire system)

• 1) Offers better stability and control.
• 2) The capital cost of civil works is reducing.
  
• 3) Disruption to ecosystems and boating is
  minimized.
• 4) Ocean currents, wind-induced currents and
  as well as tidal flows can be used. There is no
  need for a large tidal rise and fall.
• 5) No fuel-absence of CO2 emissions, radiation
  and particulate matter pollution
• No waste of disposal requirements, and no danger
  of spillage or other environmental damage
• No noise pollution. No visual pollution.
• 8) No negative impact on marine life. In fact,
  can encourage growth of marine life and reduces
  shoreline erosion.

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Conclusion

• The PSCAD simulation results with a HOTT 6.3 MW
  test system demonstrate satisfactory operation
  for a range of wind and tidal speeds using
  6-pulse GTO rectifier DC connection and inverter,
  it was successfully simulated by PSCAD/EMTDC.
• The key techniques of offshore-wind and tidal
  power estimation, electric transmission and
  connection, system and stability operation,
  system investigation, reactive power and voltage
  control strategy, the interaction between
  offshore-wind and tidal turbine.
• HOTT will be competitive lead in its field,
  together with the most efficient technology and
  uniquely practical methods for servicing it. In
  short we believe our technology meets a huge new
  need, and can deliver energy in future, as
  predictably as the tides that drive it and with
  minimal risk to the local environment.

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Thank You

• I appreciate for you valuable time and pay
  attention.
• Any
• Questions
• Or
• Suggestions
• Or
• Comments?