DEIF AGC-4 Generator Controller Configuration and Debugging Guide

Complete Guide to Application and Parameter Configuration of DEIF AGC-4 Generator Controller

In the fields of diesel generator sets, ship power systems, and emergency power stations, the DEIF AGC-4 controller has become the core device for protection, parallel operation, and power management of medium and large units due to its high integration, flexibility, and powerful communication capabilities. This controller supports various application modes such as automatic mains fault (AMF), islanding operation, fixed power/base load, peak shaving, load transfer, and mains output, and is equipped with rich ANSI protection functions, PID regulators, synchronous logic, and programmable I/O. For on-site engineers, a deep understanding of their functional architecture and parameter tuning logic is key to ensuring the safe grid connection and stable operation of the unit. This article is based on the AGC-4 Design Reference Manual (DRH), which systematically outlines its core functions, protection configurations, regulator principles, and typical additional functions, providing engineers with a practical technical reference.

Product positioning and applicable scenarios

AGC-4 belongs to the DEIF Multi line 2 product family, designed specifically for generator sets, busbars, and grid access. Its basic models include generator protection, speed/voltage regulation control, synchronization, and load distribution. It can be extended to multi machine parallel, multi-channel mains, and energy management systems through optional hardware (such as D1 voltage regulation, G5 power management) and software options. Standard applications include:

AMF (Automatic Mains Failure): After the mains voltage drops, the unit automatically starts and closes, and returns synchronously after the mains power is restored.

Island operation: Independently loaded, started and stopped according to digital or timed instructions.

Fixed power/base load: When connected to the grid, it outputs constant active power and participates in grid support.

Peak shaving: When the imported power of the mains exceeds the limit, the unit supplements the difference.

Load transfer: Smooth transfer of mains power load to the unit to achieve independent power supply.

Municipal power output (fixed power output): To output or input constant power to the grid.

The system supports three-phase, phase separation, and single-phase measurement, with a direct voltage input range of 100-690V AC and a frequency of 30-70Hz, suitable for mainstream global power grid standards.

Measurement system and rated parameter settings

The AGC-4 factory default three-phase four wire measurement can be switched to phase separation or single-phase mode through the jump menu 9130, and the rated voltage (menu 6004), CT ratio (6043/6044), and bus voltage transformer parameters (6051~6053) can be adjusted accordingly. Key point: If there is no PT on the busbar, set 6054 to "BB Unom=G Unom" to ensure that the busbar is rated to follow the generator. The controller supports four sets of rated parameter sets (6001~6036), which can be dynamically switched through digital input, AOP or M-Logic. It is particularly suitable for mobile power stations or scenarios that require seasonal adjustment of protection settings.

Voltage scaling (9030) can be set to 100-25000V by default. If the on-site voltage exceeds this range, the input range needs to be modified with the master password permission to ensure that the primary value is displayed correctly.

Standard Protection Function (ANSI)

AGC-4 provides complete generator and bus protection, all of which are timed and can independently set the starting value, delay, output relay, and fail class. The fault level ranges from "warning" to "shutdown/trip", with a total of 8 levels, determining the action behavior after the alarm (such as load shedding, trip, cooling shutdown, locking start).

Main protection list:

Reverse power (32): 2 segments to prevent the prime mover from being dragged by the power grid.

Overload (32 inverse time limit): 5 segments, delayed action according to power percentage.

Overcurrent (50/51): 6-stage fixed time limit+inverse time limit, can be used in conjunction with voltage dependence (51V) for short-circuit current attenuation scenarios.

Overvoltage/undervoltage (59/27): Generator 2-stage overvoltage, 3-stage undervoltage; Bus 4 sections overvoltage and 5 sections undervoltage, both support phase to phase or phase to phase measurement selection (1201/1202).

Over/under frequency (81): Generator 3 sections, busbar 5 sections, frequency deviation detection.

Voltage/current imbalance (60): detects three-phase asymmetry and protects windings from overheating.

Demagnetization/overexcitation (40/32RV): Prevent phase instability by limiting reactive power.

Non essential load trip (NEL): There are 3 groups in total, which can cut off secondary loads according to current, frequency, or power thresholds to prevent system collapse.

Setting prompt: Taking reverse power as an example, the typical setting value is -5%~-15%, with a delay of 5-10 seconds, and the fault level is set to "trip+stop"; Overcurrent protection needs to be coordinated with higher-level protection, commonly using a six segment reverse time limit line (110%/5s~200%/0.5s) to achieve selective tripping.