Sihwa Tidal Power Plant

Image showing Tidal energy barrier Sihwa Lake Gyeongg Korea

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Turning Tides

Reinstated Lost Link – Originally posted: August 04, 2011

“Seawater floods out of Korea’s first tidal power plant at Sihwa Lake in Gyeonggi yesterday, which is also the world’s largest. The plant, which was completed at the end of last year at a construction cost of $335 million, started operating yesterday. It can generate enough electricity to supply a city of 500,000 people for one year. By Kang Jung-hyun.” 

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Sihwa Tidal Power Plant: Quotes and References

A Tidal Power Plant (TPP) is being constructed in the middle section of the existing Lake Sihwa dike located near the southern Incheon Port in Korea. The project, which will be completed in 2010, is to harness the largest tidal energy in the Kyeonggi Bay in the eastern Yellow Sea. While noting the current progress in terms of plant construction, this paper outlines the overall project in the tidal regime and uses predictive local flow modeling.

The results of two-dimensional finite element method simulations that predict the real-time tidal characteristics during the construction and after the completion of the tidal power plant are presented, including a method to estimate the electricity output from the plant in the future.

The tidal barrage makes use of a seawall constructed in 1994 for flood mitigation and agricultural purposes. Technical details: 10 Turbine / Generator units; Runner diameter 7.5 m; Turbine Output 26 MW; Generator Output 26.8 MVA; Rated speed 64.3 rpm; Rated head 5.82 m; Rated discharge 482.1 m³/s; Rated voltage 10.2 kV; Rated current 1515 A; Annual energy production ~ 550 GWh.

The construction of the Sihwa tidal barrage power plant (TBPP) was completed in 2011 and its operation started in August. Total cost was 313.5 billion won.

Tidal energy is based on the surge of enormous amounts of water as ocean tides rise and fall. This energy is recovered through a dam built across an estuary.

The worldwide potential of tidal power. In physics, power is the amount of energy supplied by a system per unit time. In simpler terms, power can be viewed as energy output… is underexploited at present. With a current installed capacityThe power generation capacity of a particular plant. It is usually expressed in megawatts (or sometimes even gigawatts)… of just over 500 MW, it could in fact provide up to 380 TWh per year1 with a capacity of 160 GW. This potential remains, however, far below that of land-based hydropower, since worldwide hydroelectricity production from conventional dams stood at over 3,600 TWh in 2012 (See Close-Up: “Hydropower, the Leading Renewable Energy”). – Power Plant

Overlooking the Sihwa lake and the West sea, the Sihwa observatory will soon be opened for public visit in June 2014. It is the latest amenity added to the Sihwa tidal power plant – the world’s largest tidal power station, which has begun its operation since 2011, providing clean and renewable energy to half a million households in South Korea’s Gyeonggi province.

The idea of the construction of the Sihwa tidal power plant traces back to 1987, when the Korean government decided to construct the Sihwa embankment as part of a huge tideland reclamation project on the western coast. The main purpose of the project was to control flood, and to create a freshwater lake to provide water for industrial and agricultural activities. global tidal energy current status and future outlook

To date, most tidal energy generation has been focused around tidal barrage projects. Within tidal barrages, turbines generate power as water level changes in an estuary, bay or river. The longest running tidal barrage project is the installation on the Rance River in France, constructed in 1966. With 24 turbine units, each with an average generating capacity of 10MW, the Rance project was the largest in the world. However, Daewoo Engineering and Construction and Austrian company, VA Tech Hydro, are currently involved in the construction of a larger plant, the 254MW Sihwa tidal power plant in South Korea. The Sihwa project, owned by state-controlled Korea Water Resources Corporation, uses an existing dam, built in 1994 in Gyeonggi province, as its basis. Daewoo was awarded the main engineering contract while VA Tech Hydro secured a contract worth US$95.3 million to design the turbine and generator. Total project costs are US$250 million and the project is due for completion in 2009 with an estimated annual energy production of 550GW hours.

Image showing Tidal energy barrier Sihwa Lake Gyeongg KoreaMore recently, tidal stream technology has been adopted by a number of companies, including some based in the UK. Tidal stream generators convert energy from currents in flowing water (similar to the way in which wind turbines extract energy from wind streams), and need to be located in areas of strong current in order to generate power efficiently. Advantages of capturing tidal energy in this way include the idea that it is predictable, has a high power-density and appliances can be placed nearer-shore than is the case for wave energy. More specifically, tidal stream generators have a lower environmental and visual impact and are less infrastructure-heavy than barrage technologies. However, project developers are faced with a single point resource that is limited by depth as well as an extremely difficult installation and maintenance environment. Technology developers must address these issues if tidal stream energy generation is to become a reality in the UK and elsewhere. newsletter newsletter7-2_6.pdf

Sihwa Lake Tidal Power Station (Sihwa tidal power plant) is the world’s largest tidal power installation, with a total power output capacity of 254 MW, surpassing the 240 MW Rance Tidal Power Station which was the world’s largest for 45 years prior to 2011. It is operated by the Korean Water Resource Corporation.

The tidal barrage makes use of a seawall constructed in 1994 for flood mitigation and agricultural purposes. Ten 25.4 MW submerged bulb turbines are driven in an unpumped flood generation scheme; power is generated on tidal inflows only and the outflow is sluiced away. This slightly unconventional and relatively inefficient approach has been chosen to balance a complex mix of existing land use, water use, conservation, environmental and power generation considerations.

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