GE EX2100 - Manual (Page 41)

EX2100 User’s Guide GEH-6632 Chapter 2 Functional Description •••• 2-21
Proportional Gain
Anti-
windup
Preset
Value
Σ
+
+
Positive
Limit
Negative
Limit
1
s
Σ
+
-
Σ
+
-
a>b?
a
b
0.05
S
R
Q
Output Value
Tracking
Gain r/s
AVR
Setpoint
AVR
Status
Integral Gain
Tracking
Control
Preset
State
Integrator
Tracking Input
Error
Q
Status of
Regulators
Output
Preset State True
Integration
Output
Σ
+
-
Generator
Voltage
Preset Condition
Preset Not True
Gain
Scaling
1
Enable
Q
Software
Jumper 0
Software
Jumper 1
Figure 2-12. Automatic Voltage Regulator Block
Manual Reference – MANUAL REF
The MANUAL REF block generates a manual setpoint for the FVR or FCR based on
user-supplied parameters and conditions. Raise/Lower inputs to MANUAL REF
come in from other control devices on the Data Highway such as the turbine control
or HMI.
Field Voltage and Current Regulators - FVR & FCR
The Field Voltage Regulator (FVR) is the typical manual regulator supplied on most
applications and uses the generator field voltage as the feedback input. While FVR
does permit the current to vary as a function of the field resistance, the FVR makes
the manual regulator completely independent from the over excitation limiter. FVR
uses the voltage from the generator field as feedback, with a setpoint from the
MANUAL REF block. A PI regulator with integral windup protection generates the
output. During operation in AVR mode, the output of the AVR is passed directly to
the FVR output with no signal conditioning. On units that operate with an
inner field