Woodward 2301E, Инструкция по установке и эксплуатации, Страница: 39 / 182

Manual 26641 2301E Digital Control
Woodward 29
Chapter 3.
Description of Operation
Introduction
An unsafe condition could occur with improper use of these software
tools. Only trained personnel should have access to these tools.
This chapter provides an overview of the features and operation of the 2301E
Load Sharing and Speed Control.
The 2301E Load Sharing and Speed Control uses a 32 bit microprocessor for all
control functions. All control adjustments are made with an external computer
that communicates with the control via the RS-232 serial port. The external
computer can be disconnected from the control during normal operation, to
provide security against tampering.
The speed and load sharing section of these 2301E models monitors and
controls two functions:
Speed
The speed control section keeps the prime mover at the correct speed.
Load Control
The load control section manages the prime mover load based on the load
control mode:

During parallel operation of two or more generators, the load sharing section
senses the load carried by its generator and causes the loads of all
generators in the system to be shared proportionally.

During parallel operation of two or more generator or a generator paralleled
against an infinite bus the control may be operated in Baseload mode.

During parallel operation of two or more generator or a generator paralleled
against an infinite bus the control may be operated in Droop mode
Speed Control
The Speed Control system as shown in Figure 3-1 consists of:

A device (1) to sense the speed of the prime mover

A frequency sensor to software converter (2)

A speed reference [software] (3) to which the prime mover speed can be
compared

A speed summer/amplifier [software] (4) with an output [software to
hardware] proportional to the amount of fuel or steam required to maintain
the desired speed at any given load

An actuator (5) to position the fuel or steam mechanism of the prime mover
A speed-sensing device, such as a magnetic pickup, senses the speed of the
prime mover, and converts it to an AC signal with a frequency proportional to
prime mover speed. The frequency-to-software receives the ac signal from the
speed sensor and changes it to a digital number representing prime mover rpm.