-POWERFUL SOLUTIONS- HITACHI EXCITATION SYSTEM VCS-6000
-POWERFUL SOLUTIONS-HITACHI EXCITATION SYSTEM
VCS-6000
The HITACHI VCS-6000 State-of-the-Art Voltage Regulator
System Meets or Exceeds all U.S., Canadian & European
Engineering Standards
Power Plant Needs and Our Solution
Stable Power Supply
Flexible Plant Management
Centralization of Information
Quick Response & High Efficiency
Easy System Maintenance
Systems Integration
Digital-AVR
Power System Stabilizer
Human Machine Interface
Information Network
Maintenance Tool
The expansion of the power distribution
network in recent years increased the necessity for
stable operation of individual generators. Known issues
in this context are a decrease in stability as transmission
distances and load inconsistencies increase. For green
site unit projects and modernization projects, high
system efficiency and easy maintenance of control
devices are mandatory in the electric power industry.
For modernization projects, system and spare part
obsolescence are also important decision factors in
deploying a new excitation system.
The Digital Automatic Voltage Regulator and Power
System Stabilizer are the most cost effective measures
in power transmission stabilization strategies.
HITACHI’s solution is the digital, static VCS-6000
Excitation System with the integrated Power System
Stabilizer. Using a state-of-the-art 32 bit RISC
processor, the VCS-6000 integrates various functions
into the voltage control system to achieve a responsive
and reliable network.
Reasons for Excitation System Upgrade
Power Line Network
G Distribution
Network
Local
Network
Industries
& Consumer
2
Key Components of Digital-AVR Control
The primary function of the Digital AVR is regulating the
generator voltage and matching it with the voltage
reference value (90R set point). Hence, the AVR has a key
role in supplying stable voltage during power swings in the
power generation network.
Required Functions:
- Multifunction Controller
- High Reliability (system redundancy, self-diagnostic
function, compact design)
- Centralized System Supervision
- Ease of Operation, Maintenance, and Safety
- Power System Stabilizer
AVRPSS
T
G2
VG
AVR setting value
+−
Main
TransformerMain Breaker
Gn
G1
AVR: Automatic Voltage Regulator
PSS: Power System Stabilizer
Turbine
Generator
Power Grid 2
(Generator Voltage)
Local Power Oscillation(1.0Hz)
PT
Proposed improvement by means of genarator Excitation System
Inter-systemPower Oscillation
(0.3-0.5Hz)
Rotational Torque
Outline of Digital-AVR Power Stability
AVR: Maintenance of Generator Voltage
PSS: Improvement of the power system stability
Transient
Dynamic
Power Grid 1
Decrease inPower Stability
KA
3
CONTROL SYSTEM CONFIGURATION
SignalDetect
AI Control
G
DI
DO
Optic
Optic
Optic
Max 10 Parallel AC
DC
DC
DR
41 THY#n
VCMI(A)
VCMI(B)
PT-A
PT-B
EX-TR
52
Crow-
Bar
TB
PS(A)
PS(B)
GPG; Gate Pulse Generator
EX-TR; Excitation Transformer
GDIO; Gate Driver & I/O
CBC; Craw-Bar Circuit
HMI; Human Machine Interface
RDIO; Remote Digital I/O
PS; Power Source
THY#1
GDIO
AC-FCB
THY(1)
THY(2)
AVR
HMI90.6"
(2,300)
47.2"
(1,200)
(1,000)
39.4"
(1,100)
43.3"
(1,100)
43.3"
(1,000)
39.4"
(mm)inches
Typical dimensions for 375VDC / 2000ADC class
CBC
RDIORDIO
RDIORDIO
GPGSignalDetect
AI Control
HMI
GPG
VCMI; Voltage Control Module Integrated
Typical Thyristor Excitation System VCS-6000 (Redundant AVR)
Each control channel A/B has the capability to fire 10 parallel thyristor bridges. Hence, there is no limitation to the excitation rating.
Each control channel A/B has parallel control hardware for gate signal control and for I/O signal interface. Hence, there is no impact on plant operation if one channel failure occurs.
Tool
Parallel Redundant Control System Capacity Expansion
Diagnostic Identification
165.4" (4,200)
The HMI stores fault information with time stamp for both control channels.
4
VCS-6000 COMPONENTS
Example of AC Field Circuit Breaker Control System Arrangement
MAIN MENU ONLINE PROCESS MONITOR CONTROL PANEL
Fault IndicationLimiter ActionMode Selection(Local-Remote)
Channel On-Off(Master/Slave)
Scroll buttonMode SelectionAVR-AER (FCR)Var/PF On-Off
� LOCAL OPERATION / MONITORING
� COOLING FANEach THY panel has on-linemaintenance capability of the fan (hot-swap)
� GDIOGDIO supplies the gate pulse to the thyristor from the gate trigger signal received from VCMI.Functions:*Gate pulse adjustment*Digital input: 16 points*Digital output: 6 points
� RDIOMain field circuit breaker provides disconnect from excitation field circuit.AC-FCB is applicable for the ratings; 690V AC, 4,000 ADC.
� VCMI*Signal detection (V, P, Q, f, Vfdc etc.)*AVR control*Analog input: 20 points*Analog output: 7 points*Gate pulse generator*Historical trend datarecord
� FAN POWER SUPPLY
CONTACTOR
� THYRISTOR BRIDGE SECTION
Hitachi design is based on N+1 parallel redundancy as a standard.
VCMI controls these I/O signals through the optical cable transmission between RDIO and VCMI.*Digital input: 16 points*Digital output: 10 points
� AC FIELD CIRCUIT
BREAKER (41)
� HPSIHigh potential signal inter-face for signal calculation at VCMI.Input Signals:*EX-TR secondary voltage*Generator field voltage*Generator field current*Crow-bar voltage
AVR/AER SelectorExcitation ON/OFF
SelectorFCB ON/OFF
Selector
Release
Reset Alarm
� HMI(mounted on the front panel of AVR)
5
HITACHI Excitation System VCS-6000 Uses State-of-the-Art Digital Control Technology for Synchronous Machines, Providing Excellent Control and Easy Maintenance.
One simple local operation screen on front door of AVR panel prevents confusion and potential for misoperation.
Enhanced crow-bar circuit prevents energy from coming back into the control system following a collapse of the field (CEMF)
Auto tracking function between actual operating mode and other control modes for bumpless transfer.
Application of optical cable minimizes electro-magnetic
influence of signals. Application of fiber-optic cables
for gate-firing signals eliminates susceptibility to
electromagnectic interference.
VCS-6000 FEATURES
RELIABILITY
LOCAL OPERATION STABILITY & REDUNDANCY
EASE OF USE
MAINTAINABILITY
The VCS-6000 Automatic Voltage Regulator has been installed in all sizes of applications from small rotating excitation system to large static excitation system.
Selection of simplex or redundant system is available as required by the customer.
VCS-6000 assures high component reliability as a result of the following approach:
• Consolidated design results in fewer boards and less
internal wiring.
• Varnish coating for of all boards inhibits corrosion and
extends life.
Complete parallel redundant Excitation Systemthrough the following design features:
• Assuring stable plant operation by application of two parallel control channels.
• Assuring stable plant operation by implementation of N+1 Thyristor bridge circuits as standard design.
• Assuring stable plant operation by application of DC/DC & AC/DC control power supplies.
VCS-6000 provides diagnostic functions, controlfunctions and limiters as follows:
• Fault detection of each module by sophisticated self-diagnostic function.
• High-speed historical trend; records data for testing and fault analysis.
• Soft start function for prevention of generator voltage over-shooting.
•
•
• Local control panel support for quick troubleshooting using alarm history log (historian).
VCS-6000 provides excellent maintainability of the excitation control system using the Commissioning & Maintenance Tool.
• Facilitates online replacement by isolation of disfunctional control channel from operation.
• One thyristor bridge per panel assembly improves maintainability and easy identification of disfunctional bridge.
• Safe maintenance, online monitoring and tuning with Commissioning & Maintenance Tool.
ELECTRO-MAGNETIC INTERFERENCE
FLEXIBILITY
ADAPTABILITY
• Displays system parameters (Vg, Pg, Qg, etc;.) • Raise/Lower commands of reference value. • ON/OFF command and control mode selection command for excitation control for both channels in redundant system.
• Aging test for all boards.
6
EXAMPLES
VCS-6000... Competitive Advantage Through High-Tech Engineering
Fig 5 Brushless Exciter with PMG (Mainly apply for fossil power plant)
Fig 6 Brushless Exciter without PMG
Fig 7 AVR cubicle dimension (Sample)
Fig 8 AC-EX with HFG
(Mainly apply for hydro power plant)
Fig 4 500VDC
8,000A DC class
cubicle dimension
(Sample)
CT
PT
G AC -EX PMG
AVR(VCMI) CT
PT
G
PWM
AVR
HMI
(800)
31.5"
EX-TR
Brushless Exciter(BL-EX) Potential Source Rectifier Exciter(THY-EX)
Alternator-Rectifier Exciter(AC-EX)
AVR(VCMI)
PWM
110 V, 3 phase
15 A continuous, 22.5 A, 60 S
60 A continuous, 90 A, 60 S
Input
Output
PWM Rating
90.6"
(2,300)
(1,000)39.4"
Fig 9 200 VDC 200 A class
Cubicle Dimension
(Sample) 47.2"
(1,200)
AVR THY
HMI
90.6"
(2,300)
(1,000)
39.4"
(1,100)
43.3"
(mm)
inches
(mm)inches
Fig 2
375VDC 2,000 A DC class cubicle dimension
(Sample)
AC- FCB
THY (1)
THY (2) AVR
HMI
90.6"
(2,300)
47.2"
(1,200)
(1,000)
39.4"
(1,000)
39.4"
(1,100)
43.3"
(1,100)
43.3"
165.4" (4,200)
(mm)
inches
• Available maximum 10 thyristor (THY) cubicles depending on required exciter rating.
• AVR cubicle is same dimension for both single or duplicate AVR.
AC -EX
CT PT
G HFG
41 PWM
AVR (VCMI)
AC -EX
EX-TR
CT
PT
AC-FCB
AVR (VCMI)
THY
31
G
Fig 1 Apply AC-FCB (Applicable for medium capacity generator)
Tool
AVR (VCMI)
G
EX-TR
CT
PT
DC- FCB
THY
31
Fig 3 Apply DC-FCB (Applicable for large capacity generator)
AC- BUS FS
DC- BUS
THY (1)
THY (2)
THY (3)
THY (10) AVR
HMI
90.6"
(2,300)
63"
(1,600)
(mm)
inches
(800)
31.5"
(1,200)
47.2"
(1,200)
47.2"
(1,200)
47.2"
(1,200)
47.2"
(1,000)
39.4"
(1,000)
39.4"
(800)
31.5"
7
No.VCS-6000-CATA-01E2
Printed in the USA 2009(MD&A)
® Copyright 2010 Hitachi,Ltd.
All rights reserved
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This product is protected by the following patents
and/or patent pendings.
Patent: JP3314035, JP3706960 (US5594350)
Patent Pending: JP2006-129631,
JP2005-333486, JP2003-204699