ABB UNITRO1020 Brushless Excitation System

UNITROL 1020 is a voltage regulator intended for small and medium synchronous generators and industrial machines. It combines performance control and power circuits with a simple mechanical design and provides high performance in a wide range of temperature and vibration conditions. With built-in dual channel support, advanced load sharing between machines operating in parallel, rotating diode monitoring, automatic synchronizing, and several integrated communication options, this automatic voltage regulator (AVR) is manufactured using the most advanced microprocessor technology and IGBT semiconductors, allowing current output up to 20 ADC for continuous operation. It is widely applicable to industrial automation production lines, process control, power systems, mechanical engineering and other fields, supporting functions such as logic control, status monitoring, and equipment start-stop control.

• Built-in dual-channel hot backup function automatically switches to the standby channel in case of main channel failure, ensuring continuous operation and enhancing system reliability.

• Supports online channel testing to verify the effectiveness of the redundancy function without shutdown.

• Equipped with an automatic reactive power load sharing algorithm to accurately distribute reactive loads among multiple parallel generators, avoiding circulating current issues and maintaining grid stability.

• Supports Droop Control to adapt to power distribution requirements under grid frequency fluctuations.

• Real-time monitoring of the rotating diodes in the generator rotor circuit provides early warning of diode faults (such as open circuits or short circuits), preventing downtime risks caused by excitation system anomalies.

• Integrates overvoltage/undervoltage protection, overcurrent protection, overheat protection, and other functions to ensure the safe operation of the generator.

• Automatic Synchronization Function: Supports synchronization and grid connection with the power grid or other generators. Built-in phase, frequency, and voltage detection algorithms shorten the grid connection time and reduce inrush current.

• Communication Interfaces: Standard with MODBUS RTU or RS-485, and optional industrial Ethernet protocols such as PROFINET and Ethernet/IP. Supports remote monitoring and parameter configuration (e.g., via the ABB Ability? platform).

• Utilizes IGBT semiconductor technology to provide continuous 20 ADC excitation current output with fast response (voltage regulation time <0.5 seconds), suitable for scenarios with rapid load changes (such as motor starting and sudden load application).

• Output voltage adjustment range: 80% to 110% of the rated voltage (flexibly configurable via software).

• Operating temperature: -25°C to +70°C (no derating required), adapting to extreme environments such as outdoors and high-temperature workshops.

• Vibration/shock resistance: Complies with IEC 60068-2 standards (vibration: 10-500Hz, 2g; shock: 15g, 11ms), suitable for vibrating scenarios such as marine and construction machinery.

• Voltage stabilization control for small and medium power plants and data center backup generator sets.

• Microgrid systems with multiple parallel generators to achieve reactive power balancing and grid support.

• Excitation control for marine main generators or emergency generators, adapting to marine vibration and high humidity environments.

• Voltage regulation for vehicle-mounted and portable generator sets to ensure power supply quality in field operations.

• Excitation control for synchronous motors (such as compressors and pump loads) to improve power factor.

• Voltage stabilization for renewable energy systems such as small hydropower stations and gas turbines.

• Laboratory generator test platforms providing precise voltage regulation and fault simulation functions.

• High Reliability: Dual redundant channels and comprehensive protection functions, suitable for critical mission scenarios.

• Easy Integration: Supports multiple communication protocols and is compatible with ABB and third-party control systems (such as PLC and SCADA).

• Maintenance-Free Design: No vulnerable mechanical components, supports remote diagnosis, and reduces maintenance costs.

• Flexible Adaptation: Can adapt to different generator types (salient pole/non-salient pole) and excitation methods (self-shunt/separate excitation) through software configuration.