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Development and Commissioning of theFirst VSC-HVDC Demonstration Project in China
Dr. HE Zhiyuan
CEPRI OF SGCC
Aug 31, 2011
Nanhui Wind Farm IntegrationDemonstration Project - Overview
China’s first VSC-HVDC Transmission for wind farm integrationCEPRI(subsidiary of SGCC) delivered the complete transmission system, including design, manufacturing, testing and commissioning.Effectively improve the wind farm’s low voltage ride through capability.
直流输电线路
南汇风电场
大治
书院宏祥
公平
Project Description
Operation time 2011.7
Rated Capacity 18MW/20MVA
Rated AC Voltage 35kV
Rated DC Voltage ±30kV, 6X50 Submodules
DC Cable 8.4km XLPE
Converter Modular Multilevel Converter
Modular Multilevel Converter Valve
Based on modular and standard design
Parameters: 1800V, 1200A(Peak value)
Full shielding system with strong anti-interference
Easy for maintenance
Full digital drive and protection
Flexcon System
Valve Base Controller (Flexcon System)
The central control unit of Modular Multilevel Converter Valve.
Higher processing performance of capacitor voltage balance control and current balance control.
Execution period of microsecond ,less than 100us.
Overall redundancy of the system and reliable self-test technology.
Control and protection system
Hierarchical design to achieve the highest reliability. Independent control and protection equipment, all devices duplicated.
Control& Protection RoomHierarchical design diagram
Dynamic simulation test
Waveform of DC monopole grounding faultDynamic simulation platform
Equivalent simulation of Modular Multilevel Converter. Effective means for verification of PCP and VBC(Flexcon System). Modular design and flexible for expansion.
Type tests
Type test circuit for submodules Type test for VSC valves
Commissioning and test on site
Current of Upper Valve
DC line Voltage
Voltage of AC side
Voltage of Valve side
Current of Upper Valve
Active Power 18MWReactive Power 3MVar
The commission test showing good performance of the project.
Transient fault test configuration
Fault point was two kilometers from Shurou converter station
Transient fault test results
Test results of the three phase ground fault
Successfully passed the three phase short circuit test, two phase short circuit test and single phase grounding test.The rise of fault current was restrained rapidly, and the VSC-HVDC system resumed normal operation quickly after clearance of the fault.
Increasing of fault current is inhibited by the rapid control
Low voltage caused by fault
Restored after disappearance of fault
Shurou Station Nanhui Station
Three phase voltage
Three phase current
Project Planning in Dalian, China
Enhance reliability and power quality of Dalian power grid, protecting the city electricity security.
500kV线路220kV电站
火电厂
500kV电站
图 例
220kV线路
注：水雁、电雁线与南雁甲乙线约有3.8公里线路为同塔并架四回路线路图5.2-1 辽宁省大连电网柔性直流输电工程建设方案1
南关岭
革镇堡大连
三发
华能
曹屯
吴屯
至瓦房店至岔山至佟家
240MVA
360MVA360MVA
1400MW
360MVA
振兴路180MVA
金家
凌水480MVA
西山360MVA
前牧360MVA
甘井子600MW
泰山270MW
北石洞240MVA
240MVA高程山
淮河
高家180MVA
梭鱼湾360MVA
马桥180MVA
甜水湾180MVA
雁水
海湾360MVA
华昌480MVA
陆港
2×1000MVA
龙头360MVA
白玉240MVA
大化360MVA
玉华480MVA
至马场
中华路360MVA
二热600MW
港东720MVA
换流站
换流站
至黄海
53.5km
其中海底45km
青云240MVA
18.5+3km地下电缆
8kmLGJ-400X2
DC capacity 500MW/ ± 300kVAC Terminal Voltage 220kVTransmission distance: 43km
layout of ±300kV Converter station
±300kV Valve hall design
StationSend/rec
eive Terminal
Rated Active Power/
MW
AC Terminal Voltage/
kV
DC Terminal Voltage/
kV
DaishanIsland
SendTerminal 70 110 ±120
QushanIsland
SendTerminal 70 110 ±120
SijiaoIsland
ReceiveTerminal 140 110 ±120
Project Planning in Zhoushan, China
Improve the capability of wind power integration and the power supply reliability for the islands of Zhoushan network.
Effectively enhance the electricity quality of the island.
Preliminary design of Zhoushan VSC-HVDC Project
