Developments of DC Transmission & Distribution Technology ... · 2 HVDC Projects in China Station...
Transcript of Developments of DC Transmission & Distribution Technology ... · 2 HVDC Projects in China Station...
Developments of DC Transmission &
Distribution Technology in China
Mingming SHI
State Grid Corporation of CHINA
Contents
1. State Grid Introduction
2. HVDC Projects in China
3. Motivation for MVDC & LVDC
4. MVDC & LVDC Projects
5. Standardization Activities
6. Expecting Cooperation
SGCC Introduction
Fortune Global 500 RankServes of China’s
national territoryPower supply population
State Grid Corporation of China(SGCC) established on
December 29, 2002.
State Grid supplies power to over 1.1 billion population in 26
provinces, autonomous regions and municipalities, covering
88% of Chinese national territory.
1
SGCC Introduction1
SGCC Introduction1
Organizational Structure
30 Headquarter Offices
Administration Office, General Office, Strategic Research Office, Department of
Development and Planning, Department of Finance & Asset, Department of Safety
Supervision, Department of Operation & Maintenance………
27 Provincial Subsidiaries
Beijing, Tianjin, Hebei, Jibei, Shanxi, Shandong, Shanghai, Jiangsu, Zhejiang …
6 Branches
State Grid North China Branch, State Grid East China Branch
State Grid Central China Branch, State Grid Northeast China Branch
State Grid Northwest China Branch, State Grid Southwest China Branch
38 Other Subsidiaries Directly Managed by State Grid
SGCC Introduction1
SGCC Introduction1
By now, State Grid has established offices or branches in
more than 20 countries and regions, including Ethiopia,
Brazil, Pakistan, Egypt, Turkey and the Lao PDR .
SGCC Introduction1
SGCC are committed to electrification and
energy connectivity, meeting the power
demand with clean and green alternatives.
At the present time, SGCC is facing with
problems, such as:
➢ The adjustment of electricity tariffs
➢ The reform of electric power system
➢ The opening of electric power market
The Chairman of SGCC Mr. KOU proposed the “Three-Function
and Two-Network” strategy to transfer a traditional electricity
seller to an Energy Internet Enterprises.
SGCC Introduction1
Platform
based
Sharing
based
EnergyHub
based
◼ Definition of Three-Function
SGCC Introduction1
IoT
Strong Smart Grid ◼ Ubiquitous power IoT Architecture
Contents
1. State Grid Introduction
2. HVDC Projects in China
3. Motivation for MVDC & LVDC
4. MVDC & LVDC Projects
5. Standardization Activities
6. Expecting Cooperation
HVDC Projects in China2
2.1 LCC-HVDC Survey
HVDC Projects in China2
The maximum UHVDC transmission capacity is up to 10000MW(Ximeng⁃Taizhou ±800 kV project).
The heart of UHVDC project is converter valve, the rated current is 6250A.
DC LineRectifier station Inverter station
2.2 LCC-HVDC Structure
HVDC Projects in China2
17.48 Hectare
2.3 LCC-HVDC Station Area
HVDC Projects in China2
◆ Commutation failure is one of the most common failures
for LCC-HVDC transmission system.
◆ The converters of the HVDC system yield harmonic
voltages and currents because of its non-linearity.
◆ Absorbing large reactive power, mostly, 40%~60% of
the rated power.
◆ Because of passive filter and reactive power
compensator, LCC-VSC occupies large area.
2.4 LCC-HVDC Characteristics
HVDC Projects in China2
Sub module
Valve tower
Valve section
Valve hall
iPa
Ua1
Ua2
Uan
Va1
+
-
+
-Va2
+
-Van
ipb
Ub1
Ub2
Ubn
Vb1
+
-
+
-Vb2
+
-Vbn
ipc
Uc1
Uc2
Ucn
Vc1
+
-
+
-Vc2
+
-Vcn
Va(n+1)
+
-
+
-Va(n+2)
+
-Va(n+2)
iNa
Vb(n+1)
+
-
+
-Vb(n+2)
+
-Vb(n+2)
iNb
Vc(n+1)
+
-
+
-Vc(n+2)
+
-Vc(n+2)
iNc
id
Ud O
P
N
ab c
Vsa+ -Rs
Rs
Rs
isa
isb
isc
Ls
Ls
Ls
Vsb+ -
Vsc+ -
D2
+
E
T1
T2
D1
Vjk
➢ Interconnection between
nonsynchronous AC system
➢ urban power supply
➢ interconnection of islands
➢ Black Start
2.5 VSC-HVDC Survey
HVDC Projects in China2
Station Capacity /MW AC voltage /kV DC voltage /kV
ZHOUSHAN 400 220 ±200
DAISHAN 300 220 ±200
QUSHAN 100 110 ±200
SIJIAO 100 110 ±200
YANGSHAN 100 110 ±200
Each converter station adopts
modular multi-level converter(MMC),
and the converter stations are
connected by a total of 140 km
submarine cable.
2.6 ZHOUSHAN VSC-HVDC Project
HVDC Projects in China2
Zhangbei ± 500 kV VSC-HVDC demonstration
power transmission project is the first one to
build VSC HVDC transmission power grid.
2.7 ZHANGBEI VSC-HVDC Project
Contents
1. State Grid Introduction
2. HVDC Projects in China
3. Motivation for MVDC & LVDC
4. MVDC & LVDC Projects
5. Standardization Activities
6. Expecting Cooperation
Motivation for MVDC & LVDC3
Transition is happening…
3Motivation for MVDC & LVDC
3
Renewable Energy Distribution Network
MVDC Application:
Rail Transportation Shore Power
LVDC Application:
Motivation for MVDC & LVDC
Contents
1. State Grid Introduction
2. HVDC Projects in China
3. Motivation for MVDC & LVDC
4. MVDC & LVDC Projects
5. Standardization Activities
6. Expecting Cooperation
4.1 SUZHOU Renewable Energy Town
4.2 SHENZHEN Low Carbon Building
4.3 BEIJING Xiaoertai Flexible Substation
4.4 NANJING Golden Corporation LVDC Building
MVDC & LVDC Projects4
MVDC & LVDC Projects4
4.1 SUZHOU Renewable Energy Town
Multi-type distributed renewable energy source of
2.956 MW and DC load of 1.8 MW have been built in
Tongli Demonstration Zone, SUZHOU.
Distributed
Renewable
Energy
2.9 MW
External
power
supply
WG 20 kW
Solar Thermal 25 kW
Battery 700kW/ 1h
PV 2.911 MW
Thermal Storage
28.8 MJ
DC Load
1.2 MW
AC Load
Data Center 200kW
Residential Load
101kW
EV-Charger 600kW
DC Air-condition
300kW
DC Load 3kW
MVDC & LVDC Projects4
Supported by 2017-2020 National key
research project
《AC / DC hybrid renewable energy
technology based on power electronic
transformer》
4.1 SUZHOU Renewable Energy Town
MVDC & LVDC Projects4
4.1 SUZHOU Renewable Energy Town
◼ Power Electronic Transformer Topology
◼ Si-IGBT PET
◼ SiC PET
MVDC & LVDC Projects4
◼ Fault Current Limiter
4.1 SUZHOU Renewable Energy Town
Fault Current Limiter(FCL) is another key
DC equipment, which can limit fault current
by series connection to the power grid. 750V+
750V−
F1
C1 R2L1
S1+
S2+
S3+
S4+
S5+
S6+
S7+
S8+
S9+
S10+
S11+
S12+
C2 R3
R4 D1
L2
L3
C3
C4
L4 C8
R9
S13+
ZD1
S1-
S2-
S3-
S4-
S5-
S6-
S7-
S8-
S9-
S10
S11-
S12-
C6 R8
D2
S13-
ZD2
L5
L6
C7
C5
F3
R7
R5
R10
Parallel Side Series Side Filter Side
MVDC & LVDC Projects4
◼ Fault Current Experiment◼ 750V-Port Current Waveforms
4.1 SUZHOU Renewable Energy Town
◼ PET Active Power Waveforms
MVDC & LVDC Projects4
Sino-US Low Carbon Building and Community
Innovation Experimental Center
Shenzhen Institute of Building Research Co., Ltd.
focused on following fields:
◆ Prefabricated Construction
◆ DC building + Intelligent micro-grid,
◆ Indoor Environment Quality,
◆ Policy and Market Mechanism Research
4.2 SHENZHEN Low Carbon Building
MVDC & LVDC Projects4
1 LED Lighting 4.4 kW
+375V
BUS2 48V socket 4.4 kW
3 375V socket 10 kW
4 EV-charger 30 kW
5 LED Lighting 4.4 kW
-375V
BUS
6 48V socket 4.4 kW
7 375V socket 10 kW
8 Data Center 40 kW
9 Public Lighting 4 kW
10 Emergency Lighting 4 kW
11 Security system 8 kW
12 DC Air Conditioner 159 kW750V
Bus
◆Regular contact area, vertical less than
2 meters; low-power high-frequency use
of electrical appliances, power less than
100W, support hot-plug.
◆Daily activity area, vertical more than 2
meters; medium power, less plug-in
frequency of electrical appliances;
compatible with 220V AC equipment.
◆Public area, professional operation and
maintenance; high power, low contact
frequency.
4.2 SHENZHEN Low Carbon Building
MVDC & LVDC Projects4
◼ Topology of Flexible Substation ◼ Zhangbei Alibaba Data Center
◼ Valve Hall
4.3 BEIJING Xiaoertai Flexible Substation
MVDC & LVDC Projects4
4.4 Golden Corporation LVDC Building
AC/DC DC/DC DC/DC
DC Charger Active Protection
Flexible DC/DC
Active Protection Active Protection
MVDC & LVDC Projects4
4.4 Golden Corporation LVDC Building
◆ Test for typical DC appliances in DC buildings
◆ Protection equipment and control strategy research
◆ Power quality research in DC grid
0 200 400 600 800 1000 1200 14000
0.5
1
1.5
2
Um
f(V)
各频率纹波分量振幅的 95%概率大值
0 200 400 600 800 1000 1200 14000
0.5
1
1.5
2
Um
f(V)
f(Hz)
各频率纹波分量振幅的 99%概率大值
◼ 95% Probability Value
◼ 99% Probability Value
0 0.1 0.2 0.3 0.4 0.5 0.6 0.7 0.8
229.55
229.6
229.65
229.7
229.75
229.8
229.85
229.9
229.95
230
2018年 2月 11日 16时 12分 43.8秒 220V直流母线 电压有效值趋势
t (h)
Urm
s(V)
◼ 220V Bus Voltage Amplitude
Contents
1. State Grid Introduction
2. HVDC Projects in China
3. Motivation for MVDC & LVDC
4. MVDC & LVDC Projects
5. Standardization Activities
6. Expecting Cooperation
Standardization Activities5
2017.10: IEC TC8 WG9 established
in Vladivostok GM, Russia. IEC TC8
WG9 called experts together to
dedicate to the standardization work
of LVDC distribution.
2018.05: Partly participated in the
general meeting of SyC LVDC
meeting and made a presentation
about the voltage level and PQ
phenomena in LVDC distribution.
Standardization Activities5
2018.05.11~13 IEC TC8 WG9
kick-off meeting in Nanjing. (
Joint kick-off meeting together
with SyC LVDC)
2018.10.16~17 IEC TC8 WG9
WG meeting in Busan.
Established joint working group
JWG9,managed by TC8.
Standardization Activities5
2019.01.27~02.01
IEC SyC LVDC
Joint annual
meeting together
with TC8 JWG9 in
Switzerland.
Standardization Activities5
According to SyC LVDC plan, TC8 WG9 is mainly devoted to low-
voltage DC distribution network. The IEC technical report “Standard
voltage and power quality Requirements for LVDC” is the first
task, and it will be the basis of a series of standards such as follow-
up planning, protection control, operation management, etc.
Contents
1. State Grid Introduction
2. HVDC Projects in China
3. Motivation for MVDC & LVDC
4. MVDC & LVDC Projects
5. Standardization Activities
6. Expecting Cooperation
Expecting Cooperation6
➢ Establish DC Voltage Level and Power Quality Standard
together,such as Intelligent Home, DC Building, Electric
Vehicle, Low Voltage DC Interface and Coordination Operation
of New Energy Access.
➢ Enhance exchanges and cooperation between academies,
analyze the stability of DC network, investigate DC arc
suppression technology, promote DC community development.
➢ Sino-Japanese cooperate to build DC demonstration
projects and laboratories, jointly develop new products and
promote the application of low-voltage DC appliances.
Thanks for your attention!