ABB UNITOL 1000 series automatic voltage regulator

ABB UNITOL 1000 series automatic voltage regulator

Product overview

The ABB UNITOL 1000 series is a compact, high-performance automatic voltage regulator (AVR), consisting of three models: UNITOL 1005, 1010, and 1020, designed specifically for low-power range applications, setting a new benchmark in the industry with functionality, reliability, and connectivity. This series adopts separate communication and control processors, equipped with non-volatile flash storage for event and data logs, supports Ethernet time synchronization and event timestamps, and is suitable for various industrial scenarios.

Product model and core parameters

UNITROL 1005:5A continuous, 10A peak, for low-end excitation applications, shares software source code and simulation model with 1010/1020, supports USB, Ethernet, no HMI, analog I/O is 2 inputs, digital I/O is 8 inputs+4 outputs

UNITROL 1010:10A continuous, 20A peak, compact device with limited functionality, same mechanical size and interface as 1020, supports Ethernet RS485（Modbus RTU/VDC）、USB， Analog I/O consists of 3 inputs and 2 outputs, while digital I/O consists of 4 inputs and 8 inputs/outputs

UNITROL 1020:20A continuous, 38A peak, high performance, with a local human-machine interface, comprehensive functions, interface identical to 1010, I/O configuration identical to 1010, and an intuitive local control panel added

Main functions and features

Control mode: Supports automatic voltage regulator (AVR), excitation current regulator (FCR), power factor regulator (PF), reactive power regulator (VAR), etc., and can achieve disturbance free switching between various modes.

Limiter and protection: including excitation current limiter (minimum/maximum), PQ minimum limiter, motor current limiter, V/Hz limiter, motor voltage limiter, etc., to ensure the safe and stable operation of synchronous motors; It has functions such as soft start, voltage matching, and rotating diode monitoring.

Software Function Package: Provides four versions: ECO, LIGHT, BASIC, and FULL, ranging from basic functions to advanced features such as synchronization, event recording, data recording, and real-time clock. The FULL version can also add a Power System Stabilizer (PSS) option, which complies with the IEEE 421.5-2005 standard.

Communication capability: Supports protocols such as Modbus RTU, Modbus TCP, CAN, etc., equipped with Ethernet and USB ports for easy connection to debugging tools and remote access.

Environmental adaptability: Designed for wide temperature environments and harsh industrial conditions, it can be directly installed on machines and has high EMC immunity.

Debugging and maintenance tools

CMT 1000 is a debugging and maintenance tool for this series, which connects devices via USB or Ethernet. Its functions include:

Set parameters and adjust PID to ensure stable operation;

Comprehensive monitoring system to assist in identifying and locating issues during on-site debugging;

Provide functions such as a main window (displaying access modes and device information), a settings adjustment window (viewing control modes, alarms, etc.), and an oscilloscope (recording and analyzing signals).

application area 

Widely used in land-based power plants (based on diesel engines, gas/steam turbines, water turbines), ships (electric propulsion and auxiliary power supply), traction (diesel electric locomotives), wind energy (based on directly connected synchronous motors), synchronous motors, and variable speed applications.

Working principle

Signal acquisition: Real time acquisition of key parameters such as three-phase voltage, current, and grid voltage of the motor through measuring terminals, as a basis for adjustment.

Deviation calculation: Compare the actual voltage of the collected motor with the set target voltage to calculate the deviation value.

Control regulation: Based on the deviation value, the built-in control algorithm (such as PID regulation) is used to generate excitation current regulation commands, and the current size of the excitation system is adjusted through the IGBT power output stage.

Dynamic response: Quickly respond to changes in the power grid or load, adjust the magnetic field strength of the motor by changing the excitation current, and then correct the motor terminal voltage to stabilize it within the set range.

Protection and Limitation: Equipped with multiple limiters (such as excitation current, V/Hz limit, etc.), it automatically intervenes when parameters exceed the safe range to prevent motor overload or damage, ensuring the safe operation of the system.