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Profitable Production of Stable Electrical Power Using Wind-battery Hybrid Power Systems: A Case Study from Mt. Taegi, South Korea

  • Sangwook Park
  • Gwon Deok Han
  • Junmo Koo
  • Hyung Jong Choi
  • Joon Hyung ShimEmail author
Regular Paper
First Online:

Abstract

In this study, wind-battery hybrid power systems are designed, evaluated, and optimized for regular supply of electrical power at a designated minimum load level with no shortage. Our simulation uses lead-acid batteries and vanadium redox flow batteries (VRBs) for storage, and utilizes hourly wind speed data measured in 2012 at Mt. Taegi in South Korea. Twenty Vestas V80 wind turbines, each rated at 2 MW, are used as power generators, on the basis of an actual wind turbine project recently installed at Mt. Taegi. Sale to the main grid of electricity generated in excess of the minimum load offset the initial capital costs for installation of the wind turbines and batteries. Results show that the optimized wind-VRB hybrid system can supply more than 9 MW of regular electrical power at no cost. Even higher levels of production are profitable with sale of the wind-generated electricity directly to a demand site at a price greater than the price of sales to the main grid. A reduction in the VRB electrolyte costs and an increase in carbon taxes can also increase profitability.

Keywords

Wind power Wind hybrid systems Energy storage systems Microgrid simulation 

List of symbols

HOMER

Hybrid optimization model for multiple energy resources

VRB

Vanadium redox flow battery

KPX

Korea power exchange

KEPCO

Korea Electric Power Corporation

HRES

Hybrid renewable energy systems

NPR

Net present revenue ($)

NPC

Net present cost ($)

SMP

System marginal price ($)

SMPh

System marginal price for each hour during a year ($)

ETS

Emission trading scheme

Uhub

Wind speed at the hub height of the wind turbine (m/s)

Uanem

Wind speed at the anemometer height (m/s)

zhub

Hub height of the wind turbine (m)

zanem

Anemometer height (m)

zo

Surface roughness length (m)

fd

Discount factor

I

Real interest rate (%)

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Notes

Acknowledgements

This work was supported by the Korea Institute of Energy Technology Evaluation and Planning (KETEP) and the Ministry of Trade, Industry & Energy (MOTIE) of the Republic of Korea (No. 20173010032170).

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Copyright information

© Korean Society for Precision Engineering 2019

Authors and Affiliations

  • Sangwook Park
    • 1
  • Gwon Deok Han
    • 2
  • Junmo Koo
    • 2
  • Hyung Jong Choi
    • 2
  • Joon Hyung Shim
    • 1
    • 2
    Email author
  1. 1.Department of Mechanical EngineeringStanford UniversityStanfordUSA
  2. 2.School of Mechanical EngineeringKorea UniversitySeoulRepublic of Korea

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