Operational Experience and Challenges of UHV Grid in ECG · Coordinate power grid planning and...
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Operational Experience and Challenges of UHV Grid in ECG EAST CHINA DISPATCHING CENTER Jian Zhou, Liang Wang, Haibao Zhai Speaker: Liang Wang 2015 July 1
Transcript of Operational Experience and Challenges of UHV Grid in ECG · Coordinate power grid planning and...
Operational Experience and Challenges of UHV Grid in ECG
EAST CHINA DISPATCHING CENTER
Jian Zhou, Liang Wang, Haibao Zhai
Speaker: Liang Wang
2015 July
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2
2. Operational Condition of UHV systems in ECG
4. Opportunities and Challenges brought by UHV Systems
1. Brief Introduction of ECG
Outline
3. Outlook of Further UHV Construction in ECG
3
ECG
NECG
NWCG NCG
P3
CCG
State Grid
South China Grid
Tianjin Beijing
Jibei
Hebei
Shanxi Neimeng
Shandong
Shanghai
Jiangsu
Zhejiang
Anhui
Fujian
Sichuan Hubei
Henan
Hunan
Jiangxi
Chongqing
Xinjiang
Tibet
Shanxi
Gansu
Qinghai
Ningxia
Liaoning
Jilin
Heilongjiang
Mengdong
Yunnan
Guizhou
Guangxi
Guangdong
Hainan
Taiwan
East China Grid
4 Provinces + 1 Municipality
Power Supply Area 480000 km2
Population 250 million
GDP 17380 billion RMB
Brief Introduction of ECG
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0.0
5.0
10.0
15.0
20.0
25.0
0
2000
4000
6000
8000
10000
12000
00年
01年
02年
03年
04年
05年
06年
07年
08年
09年
10年
11年
12年
13年
14年
%
年用电量 增长率
2000－2013 Annual Electricity Consumption of ECG and its Growth Rate
Power Consumption Nearly Tripled
Rapid Growth in Grid Scale and Power Consumption
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2000年2001年2002年
2003年2004年
2005年
2006年
2007年2008年
2009年
2010年
2011年2012年
2013年
0.00
5.00
10.00
15.00
20.00
25.00
30.00
35.00
40.00
45.00
50.00
55.00
60.00
0100020003000400050006000700080009000
100001100012000130001400015000160001700018000190002000021000 %万千瓦
全网 增长率
2000－2013 Peak Load of ECG
Peak Load and Grid Scale Tripled
Grid Scale of 500kV and above 2000 2005 2010 2014
Substations and Plants 23 70 150 200
Transformers 30 102 216 303
Substation Capacity （10k kVA） 2045 7990 18165 29195
AC Transmission Lines 40 163 351 489
Total Length （km） 3978.6 11691.7 21450 31048.7
Rapid Growth in Grid Scale and Power Consumption
6 Grid Structure of ECG in 2014
* P6
Receiving end power grid
centered around Yangtze River
Delta
Receiving power from 7 DC
projects
Shanghai: enlarged double ring
grid
Jiangsu:3 horizontal + 4 vertical
transmission corridors
Zhejiang: vertical double ring
grid
Anhui: 1 UHV + 3 transmission
corridors (west, middle, east)
华新
龙政直流宜华直流葛南直流林枫直流
枫泾
复奉直流
奉贤
黄渡
太仓
徐行
汾湖
三林
当涂
繁昌
廻峰山
天目
湖
政平
苏州
敬亭
瓶窑
河沥
锦苏直流
富阳
三堡
阳城
石牌
南桥
妙西
武南
2800MW
2800MW
1160MW
2800MW
7200MW
6400MW
宁德
金华
江
苏
安
徽
上海
浙
江
福
建
宾金直流 8000MW
Lanjiang
Liandu
Rongcheng
Huainan
Wuhu
Anji
Liantang
7 Characteristics of ECG in 2014
2 UHV AC systems, 3 UHV DC
systems
Characteristic of wet and dry period
Light load at night。
Load flow distribution shift
Short-circuit current exceeding
problem
华新
龙政直流宜华直流葛南直流林枫直流
枫泾
复奉直流
奉贤
黄渡
太仓
徐行
汾湖
三林
当涂
繁昌
廻峰山
天目
湖
政平
苏州
敬亭
瓶窑
河沥
锦苏直流
富阳
三堡
阳城
石牌
南桥
妙西
武南
2800MW
2800MW
1160MW
2800MW
7200MW
6400MW
宁德
金华
江
苏
安
徽
上海
浙
江
福
建
宾金直流 8000MW
Lanjiang
Liandu
Rongcheng
Huainan
Wuhu
Anji
Liantang
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2. Operational Condition of UHV systems in ECG
4. Opportunities and Challenges brought by UHV Systems
1. Brief Introduction of ECG
Outline
3. Outlook of Further UHV Construction in ECG
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Outline
Brief Introduction of UHV Systems in Operation 1
2
3
Advantages of UHV Systems in Operation
Difficulties from Operation of UHV Systems
4 Steps We Took to Ensure the Safety of UHV
10 华东特高压交直流工程投运现状
UHV AC：
Huaihu from Anhui to
Shanghai（2013.09）
Zhefu from Fujian to
Zhejiang（2014.12）
UHV DC：
±800kV Fufeng
6.4 GW（2010.07）
±800kV Jinsu
7.2GW（2012.12）
± 800kV Binjin
8 GW（2014.07）
Brief Introduction of UHV Systems in Operation
华新
龙政直流宜华直流葛南直流林枫直流
枫泾
复奉直流
奉贤
黄渡
太仓
徐行
汾湖
三林
当涂
繁昌
廻峰山
天目
湖
政平
苏州
敬亭
瓶窑
河沥
锦苏直流
富阳
三堡
阳城
石牌
南桥
妙西
武南
2800MW
2800MW
1160MW
2800MW
7200MW
6400MW
宁德
金华
江
苏
安
徽
上海
浙
江
福
建
宾金直流 8000MW
Lanjiang
Liandu
Rongcheng
Huainan
Wuhu
Anji
Liantang
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Outline
Brief Introduction of UHV Systems in Operation 1
2
3
Advantages of UHV Systems in Operation
Difficulties from Operation of UHV Systems
4 Steps We Took to Ensure the Safety of UHV
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ECG
NECG
NWCG NCG
CCG
State Grid
South Grid
Shanghai
Jiangsu
Zhejiang
Anhui
Fujian
Sichuan 重庆
Fufeng 640
Jinsu 720 Xiangjiaba
Jindong
Xiluodu Binjin 800
Balance of electricity power
Relieve heavy
load on branch
groups, improve
margin of safety
Contribute to air
pollution control
UHV DC projects
Connect power center in Anhui and load center in Shanghai ： Increase sending capability of Anhui, 7.5 GW to 13 GW Improve receiving ability of Shanghai 6 GW to 8.5 GW Strengthen ECG’s ability against DC bipolar blocking Max power 4.08 GW，Accumulated power 26880 GWh
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安
徽
上海
福
建
浙江Lanjiang
Liandu
Rongcheng
Huainan
Wuhu
Anji
Liantang
Huaihu UHV AC project
亭卫泗泾
仁和
袁庄楚城
妙西
淮南
皖南
浙北
平圩二期
沪西
2×12
km
2×5km
2×333..6km
km
2×3000MVA
2×61k
m
2×
34k
m
2×640MW
安徽
浙江
上海江苏
廻峰山
天目湖
当涂
2×
20k
m
2×
28km
瓶窑
富阳
敬亭
河沥
m
2×25k
汾湖
武南
石牌
太仓徐行
黄渡
三林1×3000MVA
2×3000MVA
2×3000MVA
苏州
2×3000MVA
平三
2×1000MW
凤城
2×151.9km
2×20 km
2×161
.9km
2×
62.5km
2×630MW
2×660MW
繁昌
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安
徽
上海
福
建
浙江Lanjiang
Liandu
Rongcheng
Huainan
Wuhu
Anji
Liantang
Zhefu UHV AC project
Connects power plants in Fujian province with load centers on ECG Relieve Fujian sending branch groups, Zhejiang interchange branch groups,
Qiantang river branch groups Improve the ability to consume power from Binjin project Resist the risk of DC bipolar blocking on Binjin。 Max power 7.16 GW
仁和
妙西
芜湖 安吉 161.9km
2×3000MVA
安徽
浙江
上海20km
28km
1×3000MVA151.9km
浙中2×3000MVA
浙南
金华
福州
凤仪双龙
笠里
宁德 晴川
万象
2×3000MVA
2×3000MVA
279 km
121.5
km
197.4
km
福建
240km
70 km
70
练塘2×3000MVA
168km
20 km
30
km
46 km
30kmLGJ-8*6309320MW
LGJ-4*630
2330MWLG
J-4*
630
2800
MW
LGJ-4*400
2260MW
富阳
涌潮
乔司
LG
J-4
*400
2290M
W
LG
J-4*630
2940M
W
87.9
km
28.1
km
瓯海
丹溪
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Outline
Brief Introduction of UHV Systems in Operation 1
2
3
Advantages of UHV Systems in Operation
Difficulties from Operation of UHV Systems
4 Steps We Took to Ensure the Safety of UHV
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Strong DC, weak AC。
7 DC systems(3+4 ), 2 AC systems
DC bipolar blocking
Received electricity grows, peak regulation becomes harder
Power shortage to power surplus
DC electricity does not participate in peak regulation
Heavy load on transmission lines near DC converter stations
Low level of stability at initial stage, need power system stability
control system
Few UHV AC transmission lines now
Security and stability control system
Disconnect generators during DC blocking
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Outline
Brief Introduction of UHV Systems in Operation 1
2
3
Advantages of UHV Systems in Operation
Difficulties from Operation of UHV Systems
4 Steps We Took to Ensure the Safety of UHV
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Conducting 2 to 3 years rolling analysis
Sort problems existed in current power grid
Coordinate power grid planning and dispatch operation
Transit from 500kV power grid to UHV power grid
Analyze system characteristic, establish all kinds of regulations
Regulation of dispatching operation
Voltage control strategy
Protection setting scheme
Emergency response plans
Optimize outage schedule, implement device startup work。
Reduce impact to the minimum
Sending dispatchers to work site
Optimize resources among grid, establish reserve sharing
mechanism
Automatically arrange supporting power during DC blocking
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Coordinated safety control technology in UHV grid
Integrated intelligent alarm system
Real-time stability calculation and evaluation
Real-time analyze on low frequency oscillation
Multi-level coordinated control system
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Video access of UHV substations
Implementation of PMU device (Installed in 165 sub-stations or plants)
Power grid display and monitor system
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Identify and classify contingencies
Provide suggestions of response action
Shorten perception time (minutes to seconds)
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Steady stability analysis
Contingency analysis
Stability limit analysis on branch groups
Dynamic stability analysis
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Reserve sharing
Frequency recovery
fKPPfKPEAC s
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2. Operational Condition of UHV systems in ECG
4. Opportunities and Challenges brought by UHV Systems
1. Brief Introduction of ECG
Outline
3. Outlook of Further UHV Construction in ECG
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Huainan
Suzhou
Lanjiang
Liandu
Rongcheng
Liantang Wuhu
Taizhou Nanjing
Anji
Outlook of future UHV construction
North Rim UHV AC project
(2016)
±800kV Ningshao UHV DC
project (8 GW, 2016)
±800kV Ximen to Taizhou UHV
DC project(10 GW, 2017)
±800kV Shanxi to Nanjing UHV
DC project(8 GW, 2017)
±1100kV Zhundong to Wannan
UHV DC project (12 GW, 2018)
By 2018, 3 UHV AC projects,
7 UHV DC projects
Linshao
Taibei
North Nanjing
Wannan
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Huainan
Suzhou
Lanjiang
Liandu
Rongcheng
Liantang Wuhu
Taizhou Nanjing
Anji
Outlook of future UHV construction
Advantages:
Complete UHV ring grid
External power
Internal exchange
Margin of power balance
Challenges:
UHV DC with hierarchical
access
Lack of experience
Peak regulation
DC and AC system interaction
Power consumption
Linshao
Taibei
North Nanjing
Wannan
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2. Operational Condition of UHV systems in ECG
4. Opportunities and Challenges brought by UHV Systems
1. Brief Introduction of ECG
Outline
3. Outlook of Further UHV Construction in ECG
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Reverse allocation of power source and load center
Long transmission distance
Large transmission capacity
Low line loss
Less land use
Clean power consumption
Solving short-circuit exceeding problem
Advantages of UHV in nationwide
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1、 Fundamentally alleviate the tension of power shortage
Power shortage to power surplus
By 2018, incoming power 69.7 GW
2、 Substantially improve ECG’s ability of optimal resource allocation Preliminary network of UHV power grid is formed
Closer connection between provincial grids
Shorter electrical distance
3、 Beneficial to clean power consumption and air pollution control
Most power sources of the follow-up UHV systems are hydropower and wind power
Advantages of UHV in ECG
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1、 Stability level of UHV power grid needs to be improved
Few UHV transmission lines, rely on security and stability control systems 。
2、 Interaction between AC and DC systems
Fast construction of DC projects
3、Impact of single contingency increases
Large transmission capacity of UHV DC projects
4、Peak regulation Clean power grow
Peak power insufficient
Single province to whole region
5、 Power grids of different level
500kV grid slows down
Safety of power flow near DC converter substation
Coordinated development between power grids of different level
Wuhu UHV sub-Station
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