Month: November 2025

Power System Stabilizer (PSS)

PSS can be an option to provide standard IEEE

421.5-2005 2A/2B/2C function. The PSS provision

is nowadays included in most grid codes. The PSS

is used for effective damping

of power oscillations caused by the physical power grid.

Software upgrades can be ordered and easily

enabled by password over the CMT1000. even

while the unit is in operation.

Common software and tool for the complete

UNITROL® 1000 product portfolio:

All UNITROL® 1000 products are based on

the same target software source code,

therefore equal performance can be seen with

UNITROL® 1010/20 as well as with UNITROL® 1005.

The same simulation models can be used for the

entire UNITROL® 1000 product family, making

UNITROL® 1000 products suitable for very

demanding grid code applications.

Eco:

The ECO version covers essential functionality

for cost sensitive applications.

Light:

The light version adds to ECO standard

functions as rotating diode monitoring and

remote control via modbus. Furthermore, a

simplified data logger called history logger

allows the user to track the last two hours of

operation for analyzing.

Basic:

The BASIC version is the ideal solution for

applications with multiple machine operating

on the same busbar. Accurate reactive load

sharing via serial communication (VDC) and

fast automatic synchronization are the key

functionalities. Furthermore, a dual-channel

functionality and motor start sequence

functionality are supported.

Full:

Complex and demanding projects often ask for

transient recorders and plant clock synchronized

data logger function.

The FULL version has the capacity to meet these requirements.

UNITROL® 1005. UNITROL® 1010 and

UNITROL® 1020 are the latest products of

the UNITROL® 1000 family. For most reliable

operation, the communication and control

tasks are split into separate controllers.

The non-volatile flash memory of the AVR stores

events and data logs to enable fault analysis and

fast trouble shooting. Time synchronization is

done over Ethernet communication, and the

events and data logs are time-stamped.

UNITROL® 1000 is provided with modern

communication ports like Ethernet and USB for

connection of the PC-based commissioning tool CMT 1000.

Besides it is possible to power up the controller

of the device via USB port. Thus the user can

download files or configure the device even when

no input power is available. The AVR output stage

is based on proven IGBT technology, which allows

AC and/or DC voltage inputs from different

sources. UNITROL® 1005. UNITROL® 1010 and

UNITROL® 1020 are designed for a wide range

of ambient temperature and harsh environmental conditions.

Key benefits

Stable and reliable control of your machine:

• Highly integrated and robust AVR for harsh

industrial environment. Stable and accurate

regulation even with highly disturbed voltages.

AVR for various applications:

• Fully configurable I/Os and measurement

inputs and user-specific configurable fieldbus

interface enable easy plant integration.

Easy operation, monitoring and maintenance of the system:

• Intuitive and user-friendly commissioning tool.

Full support for grid codes:

• Certified AVR according to German grid code

including verified simulation models, capable

of analyzing dynamic net faults (FRT);

• Built-in Power System Stabilizer (option),

simulation models and grid code studies available.

Efficient product life cycle management:

• Extended life time of your assets with minimum costs.

Professional technical help always with in your reach:

• ABB’s global excitation service network.

Why to choose ABB’s UNITROL 1000 FLEX Systems:

 • UNITROL 1020 FULL functionalities

 • All regulation types available: AVR/FCR/PF/ VAR/Limiters

 • Automatic synchronization

 • MODBUS TCP Communication

 • Rotating Diode Monitoring (RDM)

 • Reactive Load Sharing via RS485

Single or dual channel controllers: the main benefit of a dual channel system is its lower failure rate.

The changeover from one channel to the second channel is done automatically and bumplessly thanks to

UNITROL 1000 technology.

This guarantees higher availability of the overall system. It also allows you to stay online if one of the 

channels fails. While a single channel failure would cause a trip of the system,

the dual channel controller allows you to find root cause and fix issue whilst the system stays running.

Full redundancy: in dual channel applications both the channels have independent power supply and

allow to be fully redundant in the operation.

Gride code compliant product:

• Many aging units require to be updated to newer standards.

• When PSS is required by the Grid Authority, UNITROL 1000 has the integrated PSS as an option for both

systems and devices. 

Meaning you are not required to use any additional device to ensure compliancy with the requirements.

• The UNITROL 1000 FLEX System is supporting an alternative excitation power supply which will keep the

synchronous generator online in case of a network fault.

Premounted and tested systems: all systems are already mounted, wired and tested when leaving our

factory.

The systems can be mounted into existing or new cabinets easily. This reduce the engineering and

commissioning time, but still offers later configuration on-site by simple configuration and editable

documentation.