Description
1. Product Overview
BASLER DECS‑250 CGCM‑LN2SA1C is a high‑precision digital generator excitation control system of the DECS‑250 series, serving as an integrated core excitation‑regulation device dedicated for synchronous generator‑sets. As a standard industrial customized version, it adopts a dual‑redundant processor architecture and integrates multiple functions including excitation regulation, unit protection, parameter monitoring, grid‑connection load distribution and intelligent communication‑based operation & maintenance. It is applicable to various synchronous generator‑sets with capacity ranging from 1 MVA to 600 MVA. Equipped with adaptive PID auto‑tuning technology, the controller features fast response, high regulation accuracy, outstanding operational stability and strong capability against grid disturbances. It can precisely stabilize generator terminal voltage, reactive power and power factor. Widely deployed in thermal‑power plants, hydropower stations, distributed self‑supply power stations and standby power sources for industrial & mining facilities, it acts as a core control unit for safe, stable and efficient grid‑connection operation of generator‑sets.
2. Core Functions
Multi‑mode High‑precision Excitation Regulation: Supports five core control modes: AVR (Automatic Voltage Regulation), field‑current regulation, field‑voltage regulation, power‑factor regulation and reactive‑power regulation. It can switch automatically according to grid‑connected, islanded or fluctuating‑load conditions to meet the operation requirements of generator‑sets.
Adaptive PID Auto‑tuning: Built‑in intelligent self‑tuning algorithm can automatically identify generator characteristics and optimize PID parameters and gains. It eliminates complicated manual commissioning, greatly shortens commissioning cycle and improves system dynamic response and operational stability.
Comprehensive Generator Relay Protection: Integrates complete fault‑protection logics for generators, covering over‑voltage, under‑voltage, over‑frequency, under‑frequency, loss‑of‑excitation, over‑excitation, under‑excitation, rotor short‑circuit, abnormal speed and other faults. It triggers rapid alarm, interlock or shutdown under abnormal conditions to prevent generator damage.
Load Sharing for Parallel‑operated Multiple Units: Embeds mature grid‑connection load‑distribution logic. When several generators run in parallel, it automatically balances reactive‑power load and avoids overload or unbalanced load on single units, so as to ensure stable and balanced power supply of the grid‑connected system.
Full‑range Parameter Monitoring & Recording: Supports true‑RMS high‑precision sampling. It collects real‑time data of generator voltage, current, frequency, excitation parameters and power parameters. Data storage, trend recording and fault trace‑back functions provide complete data support for equipment maintenance and fault analysis.
- Intelligent Configuration & Remote Maintenance: Compatible with the BESTCOMSPlus professional configuration software for drag‑and‑drop logic programming and visual parameter setting. Equipped with Ethernet and USB communication ports, it realizes remote monitoring, parameter modification, firmware upgrade and real‑time diagnosis to satisfy intelligent operation‑and‑maintenance requirements of power plants.
3. Technical Specifications
| Parameter Item | Technical Specification |
|---|---|
| Product Model | DECS‑250 CGCM‑LN2SA1C |
| Brand | BASLER |
| Product Type | Digital Generator Excitation Control System |
| Applicable Generator Capacity | 1 MVA‑600 MVA Synchronous Generator‑sets |
| Core Architecture | Dual‑redundant ARM Cortex‑R5 Processor |
| Control Response Speed | ≤50 μs High‑speed Closed‑loop Response |
| Output Excitation Current | Rated 15 ADC (20 ADC at 55 ℃ ambient temperature) |
| Excitation Voltage Options | 32 VDC / 63 VDC / 125 VDC (selected according to configuration) |
| Control Modes | Adaptive switching among AVR / FCR / FVR / PF / VAR modes |
| Sampling Method | True‑RMS single‑phase / three‑phase voltage‑current sampling |
| Operating Temperature | -40 ℃ ~ +70 ℃ |
| Communication Interfaces | Ethernet, USB Industrial‑standard Interfaces |
| Core Features | Adaptive tuning, high‑speed response, multi‑level protection, precise voltage regulation, stable grid‑connection performance |
4. Working Principle
The BASLER DECS‑250 CGCM‑LN2SA1C excitation controller adopts a fully‑automatic closed‑loop control workflow: real‑time sampling → calculation & tuning → excitation adjustment → protection interlock. During operation, the high‑precision sampling unit continuously acquires stator voltage, current, frequency of the generator and grid‑condition signals, which are then sent to the dual‑redundant processor for high‑speed computation and analysis.
Based on the preset control mode and adaptive PID algorithm, the system dynamically optimizes excitation output parameters and adjusts rotor excitation voltage and current of the generator in real‑time. It quickly corrects deviations of terminal voltage and reactive power, counteracts disturbances caused by grid fluctuation and sudden‑load change and stabilizes generator output parameters. Under grid‑connected conditions, reactive‑power load sharing is implemented automatically for coordinated stable operation of multiple generators. Once electrical abnormalities or over‑limit parameters are detected, built‑in protection logics are activated immediately to execute alarm, excitation limiting, de‑excitation or shutdown interlock. Fault data will be recorded and uploaded to the upper monitoring system to guarantee safe and controllable operation of power‑generation equipment.
5. System Architecture Compatibility
This universal integrated excitation‑control device is suitable for all types of synchronous turbo‑generators, hydro‑generators and gas‑turbine generators. It can be directly connected to field‑side equipment including generator excitation windings, PT/CT sampling loops and de‑excitation switches without extra adapter modules.
At the communication level, it is compatible with mainstream industrial communication architectures and can be seamlessly integrated with plant‑wide DCS distributed‑control systems, PLCs and upper monitoring platforms for remote parameter regulation, condition monitoring and data archiving. With standard cabinet‑mount dimensions, it supports retrofitting replacement and capacity expansion of both new and existing generator‑sets. Its highly‑adaptable control logic allows fast commissioning and grid‑connection without major modification to the original power‑generation system architecture.
6. Application Scenarios
The product is widely used in various industrial power‑generation and power‑supply‑assurance scenarios for excitation regulation and safety protection of generator‑sets. In the power sector, it is applied for excitation control, grid‑connection voltage stabilization and reactive‑power regulation of medium‑and‑small‑scale thermal‑power plants, hydropower stations, gas‑fired power stations and supporting power stations of distributed photovoltaic projects. In industrial‑mining, oil‑gas and chemical industries, it stabilizes self‑owned emergency power plants and standby generators to ensure uninterrupted power supply for continuous production.
It is also suitable for standby power systems in rail transit, data centers and large municipal facilities. Capable of coping with complex operating conditions such as islanded operation, grid‑connected operation and frequent load variation, it stabilizes generator output parameters and prevents electrical faults. It serves as a core intelligent excitation‑control and safety‑protection device for all kinds of synchronous generator‑sets.
