GE  151X1233DB01SA01R4 Wind turbine pitch control I/O blue box

GE  151X1233DB01SA01R4 Wind turbine pitch control I/O blue box

R4 replaces R3/R2; interchangeable with DB01SA

PowerConversion Module(Thyristor SCR)

Negative forcing provides fast

response for load rejection and

de-excitation.

M1and M2are identical.

For EX2100e Static exciter control systems, the 3-phase, full-wave, inverting thyristor

(SCR) is the standard Power Conversion Module (PCM). The inverting bridge can

provide both positive and negative forcing voltage for optimum performance. Each

rectifier bridge includes thyristor protection circuitry, such as snubbers, filters, and fuses.

The thyristor bridge module is forced-air cooled. For most applications, redundant

cooling modules that are normally energized during operation are used. A thermistor

monitors the PCM temperature. A set of alarm and trip contacts trigger an alarm at a high

temperature level, and a trip at a higher temperature level.

Depending on the application, the PCM may include protective components for the SCRs.

Aconduction sensing circuit, in coordination with the controller software, monitors each

SCRbridge for blown fuses, missing gate pulses, or open/shorted SCRs. Reactors are

located in the ac legs that are feeding the SCRs. The snubbers are a resistor/capacitor

(RC) circuit from the anode to the cathode of each SCR. The cell snubbers, line-to-line

filters, and line reactors together perform the following functions to maintain proper

operation of the SCRs:

• Limitthe rate of change of current through the SCRs and provide a current dump to

aid in starting conduction

• Limitthe rate of change in voltage across each cell

• Limitthe reverse voltage that occurs across the cell during cell commutation

2.3 Controller Redundancy

In the warm backup (WBU) and multi-bridge configurations, the EX2100e control

features redundant control with triple modular redundancy (TMR) for voted I/O and

protection, including the field ground detector (FGD) function. The control includes

Master One (M1), Master Two (M2), and Controller (C) modules. M1 and M2 are

independent controls, each with automatic and manual regulator functions. Either M1 or

M2can control the bridge firing, as determined by the operator, or a forced transfer by C.

In the WBU configuration, M1 controls bridge #1. and M2 controls bridge #2. In the

multi-bridge configuration, the Master in control fires all bridges. The M1 and M2 control

modules each contain a UCSB controller for processing the application software. The C

controller is responsible for M1/M2 transfer and provides the third element of TMR I/O

and protection.

In the redundant control, simplex bridge configuration, M1. M2. and C, are provided with

a single bridge. In the simplex control configuration, only the M1 control and a single

bridge are provided, and only a simplex FGD is available