Power Network Control by HVDC in Japan - epcc

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Power Network Control
by HVDC in Japan
The 8th EPCC Workshop
June 2005
Toshiba Corporation
Tokyo Japan
Courtesy of N. Fukushima
All rights are reserved to Toshiba Co., any part or the whole document
shall not be copied or transferred to any form without prior permission.
TOSHIBA
1
Power Network Control
by HVDC in Japan
Islands are connected by HVDC.
The 50Hz system and the 60Hz
system are connected by HVDC as
frequency converter.
Specially designed controls are
utilized in addition to normal power
control on HVDC.
TOSHIBA
2
HVDC Projects in Japan
AFC : Automatic Frequency Control
FC : Frequency Converter
EPPS : Emergency Power Pre-Set
PM : Power Modulation
Minami - Fukumitsu
BTB 300MW – 1999
(AFC)
Hokkaido-Honshu HVDC
Link 600MW – 1993
(AFC)
Shin-Shinano FC
600MW - 1992
Higashi-Shimizu FC
300MW - 2006
(EPPS)
Sakuma FC
300MW - 1965
Kii Channel HVDC Link
1400MW – 2000 (PM, Fast power recovery, AFC)
TOSHIBA
3
Inter-Regional Interconnection in Japan
(as of 2004)
Hokkaid
o
5.3GW Hakodat
HokkaidoHonsyu
HVDC Link
Hokurik
u
5.5GW
60Hz
(101GW)
Kyush
u
17GW
500k
V
MINAMIFUKUMITSU
500k
V
500k
V
SHINSHINANO
275k
FC
V
500k
V
Kansai
33GW
KII Channel
HVDC Link
Shikok
u
5.9GW
Tohok
u
15GW
BTB
500k
V
Chugok
u
12GW
e
250k
V
Kamikita
500k
V
Chubu
28GW
500k
V
500k
V
Tokyo
64GW
FC
275k
275k
V
V
SAKUMA
50Hz (84GW)
TOSHIBA
4
EPPS
EPPS
is for emergency cases where one
of the two frequencies (50 or 60 Hz)
exceeds some limits.
In such an emergency case EPPS
immediately sends the pre-set power to
the abnormal frequency power system to
recover the frequency.
EPPS has long been successfully
operated with many actual operations in
Japan.
TOSHIBA
5
Multi-variable AFC Control
(Hokkaido-Honsyu HVDC)
Frequency of network B
Frequency of Network A
Network A
f-reference
Feed @
Back
Control
|
ƒ ¢PA
Observer
ƒ P
¢B
Integral
control
Network B
f-reference
Hokkaido
island
Network
A
DC Power reference
Bipole
Control
Honshu
island
Network
B
TOSHIBA
6
Effects of AFC (Hokkaido-Honsyu HVDC)
Ordinary AFC
Emergency AFC
1min
Hokkaido f
Hokkaido f
Honshu f
Honshu f
DC Power
Order
DC Power Order
Pole-1 DC Current
Pole-2 DC
current
Emergency AFC
switching on
AFC switching on
TOSHIBA
7
Minami-Fukumitsu BTB C/S
HEPCO
KEPCO
CEPCO
Minami-Fukumitsu
BTB
Minami-Fukumitu BTB
can prevent unnecessary
loop flows among the 3
utilities, and can control
the power flow between
HEPCO and CEPCO freely.
HEPCO: Hokkuriku Electric Power Co.
KEPCO: Kansai Electric Power Co., CEPCO: Chubu Electric Power Co.
TOSHIBA
8
Actual Power System Test
A Pumping-up generator
was tripped in Pump
Mode with 120MW.
Tie Line was opened.
HEPCO
G
BTB was operated
in AFC Mode.
KEPCO
CEPCO
When tie line between KEPCO and HEPCO
is opened, BTB is operated in AFC mode.
TOSHIBA
9
frequency i
‚g
‚šj
Actual Power System Test
60.10
magenta: HEPCO
blue
: CEPCO
+0.05Hz
60.05
60.00
59.95
59.90
0.0
5.0
10.0
15.0
DC current i
pu
tim e i
sec)
1.00
0.90
0.80
0.70
0.60
0.50
0.40
105MW
0.0
5.0
10.0
tim e i
sec)
15.0
By increasing the DC
power from HEPCO
to CEPCO by 105
MW, the maximum
frequency changes
are suppressed to
less than 0.04 Hz.
Pump rejected
TOSHIBA
10
Kii Channel HVDC Link
AC 500kV line
HVDC 1400MW,
±250kV,
Submarine Cable:
50 km
Overhead Line
50 km
Tachibana
-Wan p/s
Anan c/s
Yura s/s
Note: P/S=Power Station, S/S=Switching Station, C/S=Converter Station
Kihoku c/s
TOSHIBA
11
Power Modulation study
TOSHIBA
12
Record of Power Modulation
HVDC 1400MW (from Sikoku to
Kansai)
Power of AC line and HVDC
Line O (500kV)
2600
Chuugoku
2200
Kansai
Kyushu
Sikoku
Chubu
P ow e r [M W ]
Pac on Line-O
1800
opposite
polality
PD on HVDC
1400
1000
(
Power unbalance
M start
& Timer)
(
M stop
& Timer)
600
HVDC power setting
-2
0
2
4
6
8
10
12
Time [sec]
Power swing is well suppressed by PM controller
TOSHIBA
13
Records of Fast Power Recovery after AC fault
Recorded chart
Power flow at 1-phase fault
Sinikoma
933 1177MW
Awa
A
Id
Anan
Kihoku
-pole
Vd
50ms
50ms
3cycles
AC
Voltage B
(Vac) C
100ms
100ms
247kV
Vd
-pole
Vac
Id
G Tachibana Gen
C-phase
1phaseGphaseG-O
DC
Voltage
(Vd)
0.9p
u
-pole
-pole
-247kV
Pdc was recovered within 100ms after fault clearing
Lightning attacked 11times during 2 months after commission,
fast power recovery was completed successfully for all cases
TOSHIBA
14
Japan Electric Power Exchange
(JEPX; Started from April 2005)
JEPX
is private and voluntary
It accepts only physical transactions
Wholesale power exchanges are treated
It is the single market for the whole Japan
as long as all the ATCs are not violated
ATCs are checked to facilitate each power
exchange between players
It is to supplement bilateral transactions
TOSHIBA
15
ATC of Each Inter-Tie Line
ATC
= TTC – Margin – Scheduled Flow
ATC; Available Transfer Capability
Margin; Reserved for some risks
TTC; The most severe constraint among
thermal, stability, voltage stability, and
frequency limit. It is equipment limits for
HVDC, BTB, FC links.
Scheduled Flow; Reserved for bilateral
contracts for long time
TOSHIBA
16

Power Network Control by HVDC in Japan - epcc

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