POWER GRID INTERCONNECTIONS IN CHINA 2001-2002

1
POWER GRID INTERCONNECTIONS IN CHINA 2001-2002

• Xiaoxin Zhou
• China Electric Power Research Institute
• May 6, 2002
• Shenzhen, China

2
???????-1 Power Industry in China -1

• ?2001?? ???????3.38???
• ?????14780????
• By the end of 2001
• installed capacity 338GW
• Electricity generation 1478 TWh
• Comparing with 2000
• 319GW (5.9), 1368 TWh (8.2)

3
???????-2 Power Industry in China-2

• 35kV?????????762000??
• ??500kV??31394??
• 330kV??8669??
• 220kV??134875??
• The total length above 35kV 762,000km
• 500kV 31,394 km
• 330kV 8,669 km
• 220kV 134,875 km

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???????-3 Power Industry in China -3

• ??? 7???(?)?????????????? ????????,
  5????????????????????? (??????????)
• 7 Regional power networks
• Northeast China,
• North West China
• North China
• East China
• Central China
• South China
• Chuanyu

• 5 provincial power
• networks
• Shandong,
• Fujian,
• Xinjiang,
• Hainan,
• Tibet

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Power network in China
Northeast
Xinjiang
North
North west
Tibet
East
Central
Sichyu
South
Power network coverage 96.4
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??????????Strategic planning for Network

• ?????????????????,?????????????????????????????,??
  ??????????????????????????????????????????
• In China, energy resource is mainly scattered in
  the west, consumption is concentrated in Central,
  East and South china.
• Transmitting power from west to east, exchange
  between south and north and enhance nationwide
  interconnection
• Three corridors will be constructed in North,
  Central and South China.

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Power transmission from The West to the East
Three transmission corridors
North corridor
Central Corridor
The capacity of each corridor will reach about
20GW in 2020.
South Corridor
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???The North corridor

• ??????????1000????,??????????????????????????????
  ???????????????
• Northeast, North, Shandong, Northwest
• Distance?1000km
• Mainly by AC transmission
• Faced
• System stability
• Improving Capability
• Right of way

9
???The Central corridor

• ????????10002200??,????????,????????????????????
  ??????????????????
• East china, Central China, Chuanyu, Fujian
• Distance10002200km
• Mainly by DC transmission
• Faced
• Multi HVDC feeder Problem(6 inverters in ECPN)
• Dynamic and Voltage stability
• Right of way

10
???The South corridor

• ????????10001500??,????????????????????????????
  ??????????????????
• Guangdong, Guangxi, Guizhou, Yunnan,Hainan
• Distance10001500km
• ACDC transmission
• Faced Multi feeder Problem
• System stability
• Improving Capability

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Interconnection projects (2001-2002)

• North China Northeast China
• one circuit of 500kV AC line, 600MW-800MW,
• May, 2001
• Fujian East China
• one circuit of 500kV AC Line, 600MW
• October,2001
• Chuanyu Central China
• one circuit of 500kV AC Line, 600MW
• October, 2001

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Interconnection North-Northeact May,2001
Interconnection Chuanyu-Central China April,2002
Interconnection Fujian-East China October,2001
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Transmission projects (2001-2002)

• Three Gorges transmission projects AC and DC
  under construction
• 10,000MW Transmission project from the West to
  Guangdong AC and DC
• 750kV transmission project in Northwest passed
  the feasibility study assessment
• Others

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Thermal Base
3000MW
2500MW
1800MW
7200MW
10000MW
Hydro Power Base
9000MW
3000MW
2000MW
AC
DC
Regional Grids Interconnection in 2005
15
China experiences on grid interconnection
operation-1

• Benefits by grid interconnection, from technical
  and economical point of view
• Low frequency oscillations
• Reduce transient stability limit
• DC and AC/DC interconnection
• Central China East China by DC
• South China AC/DC

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China experiences on grid interconnection
operation-2

• Comparative large generation unit in power system
  causes operation problems
• Trip 1000MW nuclear unit in early 1990s Gondong
  power grid caused loss of stability of South
  China interconnected power system
• 600MW thermal units in Fujian power grid requires
  interconnection with East China Power Grid in
  order to avoid frequency and voltage instability

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Thermal Base
3000MW
2500MW
1800MW
7200MW
10000MW
Hydro Power Base
9000MW
3000MW
2000MW
Possible International connection
AC
AC
DC
Regional Grids Interconnection in 2010
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Thermal Base
3000MW
2500MW
1800MW
7200MW
10000MW
Hydro Power Base
9000MW
3000MW
2000MW
Possible International connection
AC
DC
Regional Grids Interconnection in 2015-2020
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Reform of China power industry

• A market- oriented reform program of China power
  industry has been approved by State Council
• Separating traditional monopolized power company
  into power generation company and power grid
  company
• Pool style regional power market with competition
  of power generation companies
• State Power Grid Company and South China Power
  Grid Company
• 4-5 power generation group companies
• One year procedure of the first stage reform

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State Power Grid Company
South China Power Grid Company
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• Thank you!