Converteam OETL 2500K1

Description

Product Description

The Converteam OETL 2500K1 is a specialized control module for a static excitation system, designed by Converteam (now part of GE Power Conversion) for large synchronous machines such as generators and motors. This module is a critical component within the OETL 2500 series excitation regulator, responsible for core control and protection functions. The primary function of the Converteam OETL 2500K1 is to govern the generator’s field current, thereby controlling its terminal voltage, reactive power output, and stability during network disturbances. It processes signals from voltage and current transformers, executes complex control algorithms (including PID loops for voltage regulation and power system stabilizer functions), and generates precise firing pulses for the thyristors in the power stage. Implementing this module is essential for ensuring the stable, efficient, and grid-code-compliant operation of large power generation units, from hydroelectric and gas turbines to synchronous condensers.

Technical Parameters and Features

• Device Type: Excitation System Control/Regulator Module (part of the OETL 2500 series).
• System Compatibility: Core component of Converteam/GE’s OETL 2500 static excitation system for synchronous machines.
• Primary Control Functions:
  • Automatic Voltage Regulator (AVR): Maintains generator terminal voltage at setpoint.
  • Manual Field Current Control: Provides manual backup/override mode.
  • Limiter Functions: Includes field current, stator current, and under-excitation/over-excitation limiters to protect the generator within its capability curve.
  • Power System Stabilizer (PSS): May include algorithms to damp electromechanical oscillations in the power grid.
• Input Signals: Accepts signals from generator terminal Voltage Transformers (VTs) and Current Transformers (CTs) for measurement and control. Also accepts setpoints, enable commands, and feedback signals.
• Output Signals: Generates control signals for the thyristor firing circuits in the power bridge. Also provides status and alarm outputs.
• Protection Functions: Integral protective features such as loss of potential detection, field ground fault detection, and over/under frequency protection.
• Communication & Interface: Likely includes serial communication ports (RS-485/Modbus) or early Ethernet for integration with the plant DCS/SCADA for remote monitoring and control.
• Construction: Typically a robust, card-based module designed for installation in a dedicated excitation system cubicle, with industrial-grade components for high reliability.

Advantages and Key Features

• High-Performance Control for Grid Stability: The Converteam OETL 2500K1 is engineered for the fast, precise control required to maintain generator stability during load changes and grid faults, contributing directly to overall power system reliability.
• Integrated Protection and Control: Combines advanced control algorithms with critical machine protection limiters in a single, coordinated platform. This integration ensures protective actions are taken in a controlled manner that supports system stability.
• Proven Technology in Critical Applications: Converteam/GE excitation systems have a long history in demanding power generation applications. The OETL 2500K1 module embodies this proven, reliable technology for large-scale synchronous machines.
• Flexible Configuration: The control strategies and limiters are typically configurable to match the specific characteristics of the generator and the requirements of the connecting grid, allowing for optimized performance.
• Designed for Serviceability: As a modular component within the excitation system, a faulty 2500K1 control module can be replaced to restore system functionality, although this requires specialized knowledge and procedures.

Application Case Studies in Various Fields

• Large Hydroelectric Generator: The Converteam OETL 2500K1 module regulates the voltage of a 300 MVA hydro-generator. Its fast AVR response manages voltage during sudden load rejection, while its PSS function damps low-frequency oscillations on the long transmission lines connecting the remote plant to the grid.
• Gas Turbine Power Plant (Generator Excitation): Controls the field of a同步 generator in a combined-cycle plant. During a grid voltage dip (fault), it forces the generator to provide maximum reactive current support (field forcing) to help stabilize the network, as per grid code requirements.
• Industrial Synchronous Motor Drive: Used on a very large synchronous motor driving a compressor in a liquefied natural gas (LNG) plant. The module controls the motor’s power factor, optimizing the plant’s overall electrical efficiency.
• Synchronous Condenser for Grid Support: In a standalone synchronous condenser used for reactive power and voltage support on a weak grid, the OETL 2500K1 provides precise control of the machine’s excitation to dynamically inject or absorb reactive power.

Comparison with Competing Products

Compared to excitation systems from other manufacturers (e.g., ABB UNITROL, Siemens SIMOTION, Basler DECS), or using a general-purpose PLC for control, the Converteam OETL 2500K1 represents a specialized, integrated solution:

1. Purpose-Built Hardware vs. Generic PLC: The OETL 2500K1 is specialized hardware with firmware dedicated to excitation control. It offers faster, more deterministic response and built-in protective functions that would require extensive custom programming and validation in a general-purpose PLC.
2. System-Centric Design: It is a component of a complete, matched excitation system (regulator + power bridge). This ensures optimal performance and avoids integration risks between a separately sourced controller and power stage from different vendors.
3. Heritage and Application Knowledge: Converteam/GE brings specific expertise in large rotating machines. The control algorithms in the 2500K1 module are refined for this application, which can be an advantage over more generalized digital excitation regulators.

Selection Advice and Important Notes

• Strict Compatibility within the OETL System: The Converteam OETL 2500K1 is not a standalone universal controller. It is a specific module for a specific excitation system model. It must be used as a spare or replacement within an existing OETL 2500 series regulator. Compatibility with the power bridge and other cubicle components is essential.
• Requires Specialized Expertise: Configuration, tuning, and troubleshooting of excitation systems are highly specialized fields. Work on the OETL 2500K1 module and the system it belongs to should only be performed by engineers or technicians trained on Converteam/GE excitation equipment.
• Parameter Backup is Critical: Before removing or replacing any control module, a complete backup of all system parameters, settings, and configuration files must be performed. Loss of these settings can render the excitation system inoperable.
• Understand Safety Procedures: Excitation systems involve high voltages and currents. Strict lockout/tagout (LOTO) procedures for both AC and DC supplies must be followed before accessing any components, including the 2500K1 control module.
• Consider Lifecycle and Migration: Converteam was acquired by GE. For long-term support and future upgrades, engage with GE Power Conversion services to understand the lifecycle status of the OETL 2500 platform and potential migration paths to newer platforms like the GE EX2100e.

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