I. Basic Information

Product Positioning

Hardware Architecture

1. Dual-processor Isolated Control & Communication Unit
   Separate control and communication dual-core design ensures high anti-interference performance, steady-state voltage regulation accuracy ≤±0.5%, optional PSS power system stabilizer to suppress grid low-frequency oscillation and improve grid-connected operation stability of units.
2. IGBT High-power Excitation Output Drive Unit
   Continuous rated excitation output 20ADC under 55℃, peak current 40ADC, with soft field flashing and de-excitation functions, built-in over-current and over-temperature hardware protection for power loop, adapting to rotating and static excitation structural units.
3. Local LCD Multi-language Human-machine Interaction Unit
   Supports on-site viewing of operating electrical parameters, fault alarms and historical events, local parameter setting and fault reset, matched with multi-group LED status indicators to intuitively display running, limiter action and equipment fault status.
4. Multi-channel Isolated Industrial Communication Unit
   Integrated Modbus TCP Ethernet, Modbus RTU RS485, CAN and USB debugging interfaces, realizing two-way high-speed data interaction between the controller, DCS/SIS background and on-site commissioning computer, supporting remote parameter downloading and fault wave recording export.
5. Non-volatile Fault Event & Waveform Storage Unit
   Cyclically stores thousands of operation, protection action and parameter modification events with accurate time stamps, can store pre-fault and post-fault electrical waveforms to provide complete original data for unit voltage instability and trip accident analysis.
6. Wide-range AC/DC Power Supply & EMC Reinforced Structure Unit
   Wide auxiliary power input range, physical partition layout of power loop and signal loop, aluminum alloy vibration-resistant base, full-conformal coated PCB, IP20 protection grade, DIN standard rail installation, adapting to harsh control room electromagnetic and temperature environments.

Mounting Specifications

• Auxiliary Control Power Supply: 9~250VAC, 18~300VDC, power consumption ≤40W
• Power Side Input: 0~250VAC, 0~300VDC, frequency 25~600Hz
• Rated Excitation Output: 20ADC continuous, 40ADC peak
• Voltage Regulation Accuracy: ≤±0.5% steady state
• Communication Interfaces: Ethernet, Isolated RS485, CAN, USB
• Local Operation: Multi-language LCD panel + function keys + status LED indicators
• Mounting: DIN35 standard rail installation
• Net Weight: 2.1kg
• Protection Class: IP20 (indoor closed cabinet only)
• Supporting Equipment: Generator excitation winding, PT/CT transformer, redundant DC control power supply, shielded communication cables
• Commissioning Tools: ABB CMT1000 excitation configuration software, signal calibrator, insulation resistance tester, anti-static wristband

Supporting System

Supporting Hardware

Commissioning Software

Upper-level System

Typical Application Industries

Product Features

1. Four-mode Flexible Closed-loop Excitation Regulation
   Supports AVR/FCR/PF/VAR four mainstream control modes, matched with multi-level software limiters to avoid generator over-excitation, under-excitation and V/Hz overload damage, adapting to full working conditions of standalone operation, grid connection and peak regulation.
2. Automatic Reactive Power Equalization for Multi-unit Parallel Operation
   Realizes reactive load sharing among multiple excitation controllers via RS485 bus, equipped with voltage droop compensation function to eliminate reactive circulation and load imbalance faults of parallel units.
3. Rotating Diode Online Fault Monitoring (RDM)
   Accurately identifies open-circuit and short-circuit faults of rotating excitation rectifier diodes, realizes early fault warning to avoid non-planned shutdown caused by excitation loop failure.
4. Dual-channel Bumpless Hot Standby Redundancy Optional
   Automatic seamless switch between main and standby channels upon main channel fault, no fluctuation in excitation output during switching, allowing online replacement of faulty equipment without unit grid disconnection.
5. Wide-temperature High-reliability Industrial Design
   Stable operation within -40℃~+70℃, compliant with IEC EMC standards, certified by UL, CE and DNV, long MTBF to support 24/7 uninterrupted operation in harsh industrial environments.
6. Standardized Compatible Spare Replacement Design
   Unified DIN rail installation size, terminal definition and communication protocol with UNITROL1000 series products, rapid commissioning can be realized only by importing original excitation parameters after equipment replacement.

II. Technical Specifications

2.1 Electrical Parameters

• Model: UNITROL1020, Part No.: 3BHE036163R6206
• Auxiliary Power Supply: 9~250VAC / 18~300VDC, power ≤40W
• Power Input Range: 0~250VAC, 0~300VDC, frequency 25~600Hz
• Excitation Output: 20ADC continuous, 40ADC peak
• Regulation Precision: ≤±0.5%
• Communication Protocols: Modbus TCP, Modbus RTU, CAN
• Dielectric Withstand Voltage: 1500VAC 1min isolation between power, signal and communication loops
• Built-in Protection: Over-excitation/under-excitation limit, V/Hz limit, stator current limit, rotating diode fault protection, excitation over-current and loss-of-excitation protection
• Core Functions: Generator terminal voltage closed-loop regulation, reactive power/power factor constant control, multi-unit parallel load sharing, rotating diode fault monitoring, soft field flashing, de-excitation control, local parameter setting, fault event waveform recording, remote data uploading, dual-channel bumpless redundant switching.

2.2 Mechanical Parameters

• Mounting Mode: DIN35 standard rail snap installation
• Housing: Flame-retardant plastic shell + aluminum alloy heat dissipation base
• Operation Unit: Multi-language LCD, function keys, running/fault/limiter status LEDs
• Interfaces: PT/CT signal terminals, excitation power output terminals, auxiliary power terminals, DI/DO terminals, multi-channel communication terminals
• Net Weight: 2.1kg

2.3 Environmental Specifications

• Operating Temperature: -40℃ ~ +70℃
• Storage Temperature: -40℃ ~ +85℃
• Humidity: 5%~95%RH, non-condensing, no corrosive gas or conductive dust

III. Key Features

1. Four-mode High-precision Closed-loop Excitation Control
   High-speed dual-core PID operation cooperates with multi-stage limit protection to ensure safe and stable operation of generators under standalone, grid-connected and peak-shaving working conditions, preventing magnetic overload and loss-of-excitation accidents.
2. Predictive Online Diagnosis of Rotating Excitation Diode Faults
   Real-time harmonic feature analysis of excitation loop realizes early warning of rectifier diode aging and damage, effectively reducing unplanned outage risks of rotating excitation generating units.
3. Automatic Reactive Load Balancing for Multi-parallel Units
   Bus-based inter-controller data interaction eliminates reactive power circulation, improving the operation safety and economic benefit of multi-generator captive power stations.
4. Time-stamped Fault Event & Waveform Offline Traceability
   Local and remote dual fault recording function provides complete data basis for voltage oscillation, unit trip and other abnormal accident analysis of power generation equipment.
5. Bumpless Dual-channel Redundant Safety Operation Mechanism
   Hot standby architecture realizes millisecond-level fault switching, which can maintain continuous excitation regulation and allow on-line maintenance of faulty equipment for key power supply units.
6. Standard Core Excitation Control Equipment for Medium and Small Generating Units
   Widely applied in new distributed energy power station projects, old analog excitation cabinet digital renovation, excitation equipment emergency spare replacement and synchronous motor drive control supporting scenarios.

IV. Working Principle

V. Application Scenarios

1. Digital renovation of old analog excitation cabinets for biomass, waste incineration captive power plants, realizing stable voltage regulation and safe parallel operation of multiple generating units.
2. Excitation system spare replacement for gas/diesel distributed power stations and marine power stations, adapting to wide-voltage power supply and harsh mobile operating environments.
3. Technical upgrading of synchronous motor drive excitation control systems in metallurgical and mining industries to ensure stable operation of high-power dragging equipment.
4. Preventive maintenance and spare reserve for small and medium hydropower plant excitation systems, realizing on-line monitoring of rotating rectifier faults and fault data archiving management.
5. Excitation parameter calibration, protection setting transmission test and redundant function verification during annual overhaul of generating units to ensure the safe and reliable operation of the power generation excitation system.