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　　I. Operating Principle

　　The AC800PEC platform utilizes a heterogeneous CPU+FPGA architecture, integrating microsecond-level high-speed closed-loop control for power electronics and millisecond-level conventional process logic into a single controller. This eliminates the need for separate high-speed controllers and independent PLCs.

　　Signal Acquisition: Real-time acquisition of analog signals—such as generator terminal voltage, stator current, rotor excitation current, unit speed, and grid voltage—alongside digital signals (switch inputs) such as circuit breaker status, cooling system status, and fault contacts.

　　AVR Closed-Loop Regulation Algorithm: Compares the measured terminal voltage with the voltage setpoint and calculates the control output using PID and Power System Stabilizer (PSS) algorithms. It automatically switches between Automatic Voltage Regulation (AVR) mode, Manual Excitation Current Regulation (FCR) mode, and Reactive Power Regulation mode.

　　Pulse Generation and Power Drive: The FPGA handles high-speed pulse logic, transmitting trigger pulses via fiber optics to the thyristor rectifier bridge. By adjusting the rectifier bridge's firing angle, it regulates the DC excitation current supplied to the generator rotor. The typical fast control cycle is approximately 400 μs, with pulse logic operating at the nanosecond level, ensuring dynamic response speeds that meet grid disturbance requirements.

　　Limiting and Protection Logic: Includes built-in functions such as ceiling excitation limiting, minimum excitation limiting, rotor overcurrent protection, stator overcurrent protection, V/F limiting, loss-of-excitation protection, and rotor overvoltage protection. If parameters exceed limits, excitation output is prioritized for limitation; in the event of a severe fault, field suppression (de-excitation) is executed. Redundant Architecture (Optional): Supports dual-channel or triple-channel hot-standby redundancy, enabling bumpless switching upon single-channel failure to meet high-availability requirements for power plants; also supports communication with the 800xA DCS system to upload event waveform records and operational data.

　　Nature of Static Excitation: The excitation power source is derived from the generator terminal AC voltage; it is rectified by thyristors and supplied to the rotor. There is no rotating exciter, and all control functions are performed by the AC800PEC.

　　II. Core Functions

　　Automatic Voltage Regulation (AVR): Maintains generator terminal voltage at the setpoint; rapidly adjusts excitation during grid voltage dips or load fluctuations to ensure voltage quality.

　　Reactive Power Regulation: Switchable between constant reactive power and constant power factor modes; controls the generator to supply or absorb reactive power from the grid, participating in grid voltage support.

　　Power System Stabilizer (PSS): Suppresses low-frequency oscillations and enhances grid transient stability; a mandatory function for grid interconnection.

　　Multi-dimensional Limiting and Protection: Constrains operational boundaries—such as excitation current, stator voltage, and magnetic flux—throughout operation to prevent equipment damage caused by rotor overheating, loss of excitation, over-excitation, or under-excitation.

　　Unit Synchronization Assistance and De-excitation Control: Coordinates with the SYNCHROTACT synchronization device to complete grid connection; triggers the de-excitation circuit during faults to rapidly dissipate rotor magnetic field energy.

　　Data Waveform Recording, Event Logging, and Local/Remote Monitoring: Features built-in fault waveform recording for post-incident analysis; supports the ECT excitation commissioning terminal for parameter setting and simulation testing.

　　System Interlock Logic: Manages auxiliary interlocks such as excitation cabinet cooling, disconnect switches, and trip circuits. III. Application Areas

　　Thermal and Gas Combined-Cycle Power Plants: Steam turbine generators and gas turbine generators represent the primary application scenarios for the UNITROL 6000; large-capacity units and grid-hub power plants typically utilize dual-channel redundant configurations.

　　Hydropower Plants: Synchronous hydro-generators (including conventional hydro and pumped-storage units); requires high performance regarding transient response and stability.

　　Industrial Captive Power Plants: Synchronous generator units owned by enterprises in sectors such as steel, chemicals, and papermaking.

　　Diesel/Gas Internal Combustion Synchronous Generators: Large-scale internal combustion generator units.

　　Synchronous Condensers: Grid-side reactive power compensation units; perform reactive power regulation only, without active power generation.

　　Marine Shore Power and Offshore Platform Generators: High-power marine synchronous generators (utilizing static excitation schemes).

　　Large Synchronous Motor Drives: Excitation control (start-up and steady-state regulation) for synchronous motors driving equipment such as mining ball mills and large compressors.

　　IV. Summary of Key Advantages

　　A single controller handles both high-speed power electronics control and conventional interlocking protection, reducing hardware count and potential points of failure associated with communication conversion.

　　Wide-temperature-range hardware with robust EMC (electromagnetic compatibility) performance, suitable for the high-interference environments found in power plants.

　　Modular design supporting hardware redundancy; enables parameter pre-commissioning via HIL (Hardware-in-the-Loop) simulation, thereby shortening the on-site commissioning cycle.

　　Native integration with the ABB 800xA system, while also supporting connectivity to third-party DCS or protection devices via Ethernet or fiber optics.

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