GE EX2100e excitation control system 35A/120A regulator

GE EX2100e excitation control system 35A/120A regulator

Product Overview

EX2100e is GE's fourth generation digital excitation control system, covering 35A and 120A rated output specifications, used for synchronous generator excitation regulation.

More than 6000 sets of thyristor/regulator systems have been put into operation in 70 countries, and over 4000 sets of previous generation systems are in operation in 60 countries.

Applicable models: steam turbine generator, gas turbine generator, hydro turbine generator, supporting new construction and renovation projects.

Seamless integration: turbine control, static start control, integrated control system ICS, HMI, supporting Ethernet/Modbus access to customer DCS.

Control hardware

Digital controller (IGBT system)

Power conversion: Input rectification → DC bus → IGBT PWM output, chopping frequency * * ≈ 1000Hz * *.

Input range:

35A system: AC 90~280V RMS

120A system: AC maximum 480V RMS

Backup power supply: DC 125~250V battery, diode isolated input.

Output capability: 100% rated continuous output, short-term strong excitation 210%.

Dual Control Warm Backup

Dual controllers: M1/M2 independent control, dual PCM power modules.

Switching: Bidirectional interference free switching, automatic backup in case of faults, without the need for manual intervention.

Output: Shared DC output circuit, with the SCM/TCM module selecting the effective bridge circuit.

control cabinet

Protection level: NEMA 1/IP20/IP21, optional IP54.

Size (standard cabinet): 800 × 2290 × 830mm; 35A single cabinet: 610 × 2286 × 508mm.

Environment: Operating temperature range of 0-40 ℃, * * 50 ℃ * * needs to be downgraded for use.

Power Conversion Module (PCM)

Integrated with 6 IGBTs, 2 channels form excitation PWM output, and 1 channel is used for dynamic discharge DD overvoltage protection.

Dual redundancy configuration: M1 primary/M2 backup are completely identical, and the health status is determined by the switching module.

Control software

Signal acquisition: PT/CT collects the voltage and current of the generator, and after ESYS conditioning, it enters the controller.

Core regulatory function:

AVR automatic voltage regulator: maintains a constant terminal voltage.

FVR excitation voltage regulator (manual).

FCR excitation current regulator (manual dedicated).

Limitations and protection functions (key items):

Functional function

Overexcitation limit OEL prevents excitation winding overheating and damage

Underexcitation limit UEL ensures static stability and prevents overheating at the stator end

V/Hz limit and protection limit voltage/frequency ratio, anti iron core saturation

PSS power system stabilizer improves dynamic stability of power grid

40 dual zone timed tripping for demagnetization protection, detecting demagnetization faults

PT fuse failure detection, automatic voltage loss, manual switching, and alarm

Auxiliary functions: generator simulation, rotor temperature calculation, VAR/power factor control, disturbance free tracking switching.

Communication and Expansion

Supported protocols: Ethernet Modbus TCP/RTU、EGD。

Docking devices: DCS, HMI, turbine control, Mark VIe, Proficy history library.

Expansion I/O: Supports VersaMax and IONet module expansion.

Debugging tools: ToolboxST, GE Onsite Support for remote diagnostics.

Technical specifications and standards

Project parameters

Continuous output 35A: 250VDC/35A; 120A：250VDC/120A

Communication input 35A: 90~280V; 120A：≤480V

DC backup 125~250VDC

Applicable standards IEEE 421.1/421.2/421.3/421.4/421.5

Seismic IBC 2006/UBC Zone 4

Testing

Factory routine testing

Circuit continuity check, voltage withstand test (IEEE 421B), and full function verification.

Customer witnessed testing

Option A: Appearance+Document Review (free standard).

Option B: Software and hardware function demonstration (optional for payment).

Key questions and answers

Question 1: What are the core advantages and working logic of EX2100e Dual Control Hot Backup (WBU)?

answer:

Core advantages: Dual controller M1/M2+dual PCM redundancy, automatic disturbance free switching in case of faults, improving the availability and safety of the excitation system.

Work logic: Two systems operate independently, with one set controlling the output and the other tracking as a backup; When the main control fails, the backup system immediately takes over, and the switching process does not disturb the operation of the generator.

Question 2: What are the key parameters for the power input and output of EX2100e? What are the differences between 35A and 120A models?

answer:

Input: Main input AC, 35A is 90-280V, 120A is * * ≤ 480V * *; Backup DC 125~250V.

Output: All rated voltages are 250VDC, rated currents are 35A and 120A respectively, and short-term strong excitation can reach 210%.

Differences: Mainly in the AC input upper limit and rated output current, the control architecture, functions, and software are completely consistent.

Question 3: What are the key protection functions of EX2100e? What risks should be addressed separately?

answer:

Demagnetization protection 40: Detect generator demagnetization faults to prevent demagnetization operation from causing the unit to lose synchronization and damage.

V/Hz protection 24G: prevents the generator core from saturating and overheating due to a high voltage/frequency ratio.

Overexcitation limit OEL: Limit the strong excitation time and current to prevent the excitation winding from overheating and burning out.

PT fuse failure detection: detect voltage loss during measurement, automatically switch to manual mode to avoid loss of control.