ABB Review Special Report - ABB - ABB Group

new regional networks. A national integratedgrid is planned for 2015.A major portion of the power will becarried to China’s industrialized coastalareas in Shanghai and Shenzheng bymeans of four HVDC links 2 :Gezhouba-Shanghai 1200-MW HVDCbipole, in operation since 1991.Three Gorges – Changzhou 3000-MWbipole (3GC), commissioned in May2003.Three Gorges – Guangdong 3000-MWbipole (3GG), currently being commissioned.Three Gorges – Shanghai, 3000 MW,scheduled to be operating by 2007.HVDC was chosen to transmit powerfrom the Three Gorges plant for severalreasons. Since the central and eastChina/Guangdong AC networks arenot synchronized an AC transmissionscheme would have required coordination,and it would have been verydifficult to ensure adequate stabilitymargins. HVDC allows controlled transmissionof power between the networks,which also retain their independence.DC is also more economic interms of construction costs and losses.Five series-compensated 500-kV AClines would be necessary to transmitthe same amount of power, and eachline would require a larger right-of-waythan one HVDC transmission line for3000 MW.Unmatched experience withHVDC bulk powerABB’s record of large bipolar HVDC installationsis unmatched. Prior to winningthe ThreeGorges contract,ABB had successfullybuilt a wholeseries of largebipolar installationsworldwide,for example:Itaipu (Brazil):two bipoles,each rated 3150 MWIntermountain Power Project (USA):one bipole, 1920 MWRihand-Dadri Project (India): onebipole, 1500 MWHVDC allows controlledtransmission of powerbetween the central andeast China/GuangdongAC networks, whichremain independent.2Left bank14x700 MWThree Gorges12x700 MWRight bankFour HVDC links will carry hydroelectricity from the Three Gorges power plantto China’s coastal area and the industrial region of GuandongCentral ChinaChandrapur–Padghe Project (India):one bipole, 1500 MWQuebec-New England Multiterminal(Canada/USA): three bipolar stationsrated 2250/2250/2000 MWHighway construction onscheduleABB was awarded the first contract, tosupply equipment for two converterstations for the 3000-MW HVDC bipolarlink between Three Gorges and eastChina, in April 1999. This entrusted ABBwith overall project responsibility, includingthe supervision of site work undertakenby the client. The contract alsoincluded ToT, covering HVDC systemdesign, control design and equipmentmanufacturing. Approximately 85% ofthe total contractvalue was forequipment or servicesprovided bythe ABB Group.The installationwas commissionedon time inMay 2003.In October 2001 ABB won a second order,this time for the 3000-MW HVDClink between Three Gorges and Guangdongprovince. This fast-track projectcuts 30 percent off the normal lead-±500 kV, 3000 MWThree Gorges – Changzhou±500 kV, 1200 MWGezouba – Shanghai± 500 kV, 3000 MWThree Gorges – Shanghai±500 kV, 3000 MWThree Gorges – Guangdongtime, enabling the first pole to be commissioned28 months after signing ofthe contract. Similar in scope to the3GC, it provides for more local content.3East ChinaGuangdongIndoor DC yard at Zhengpingconverter station (3GC)8Special ReportABB Review