Erlangen, Germany, April 26, 2011 — Siemens Energy is to supply key components for the two high-voltage direct-current transmission projects Nuozhadu-Guangdong and Xiluodu-Guangdong in southern China.
Purchaser is China Southern Power Grid Co., Guangzhou. Nuozhadu-Guangdong will have a transmission capacity of 5,000 MW at a DC voltage of about 800 kV and provide electricity to the megacities in the Guangdong region, Xiluodu-Guangdong an overall capacity of 6,400 MW at about 500 kV.
The total order value for Siemens is about $365.5 million. Commissioning of the systems is scheduled for 2013.
Large-capacity hydropower plants such as Nuozhadu and Xiluodo in southwest China will generate the carbon-free electricity for low-loss transmission by the two new HVDC systems to the megacities Guangzhou, Jiangmen, Dongguan and Shenzhen.
Alone the Xiluodo hydropower plant will after completion in early 2013 have a total capacity of 12,600 MW and would thus be China's second largest hydroplant.
For the Nuozhadu-Guangdong 800-kV HVDC bipole system Siemens together with its Chinese partners will supply the converter valves with direct light-triggered power thyristors both for the sending station in Puer in the province of Yunnan and for the receiving station in Jiangmen, Guangdong Province.
The transmission distance of this project is about 900 miles. The order also includes key components for the HVDC system instrumentation and controls, the 800-kV components for the stations' DC switchgear, and the supply of eight 800-kV converter transformers produced at the company's manufacturing plant in Nuremberg.
The Xiluodu-Guangdong HVDC project is a double 500-kV bipole system with a transmission capacity of twice 3,200 MW. For this project Siemens again together with Chinese partners will supply the converter valves for the sending station in Zhaotong, which is located in the vicinity of the Xiluodu hydropower plant in the Yunnan/Sichuan region, and for the receiving station in Conghua of Guangdong province.
The transmission distance of this project is about 800 miles. Siemens will also supply important equipment for the system's DC section.