DEIF AGC-4 Mk II Generator Controller Depth Configuration Guide

Setting prompt: Taking reverse power as an example, the typical setting is -5%~-15%, with a delay of 5-10 seconds, and the fault level is set to "trip+stop"; The overcurrent reversal time limit can be set with 6 inflection points (such as 110%/5s to 200%/0.5s) to achieve selectivity. Voltage protection should consider measurement accuracy (Class 1), and it is recommended to set the value offset by 1-2% to avoid misoperation.

PID regulator and speed/pressure control

The AGC-4 Mk II is equipped with an independent PID controller for speed regulation (GOV) and voltage regulation (AVR), which respectively manage frequency, power, active power distribution, voltage, reactive power, and reactive power distribution. The parameters of each controller (Kp, Ti, Td) can be adjusted from menu 2500 to 2690.

Proportion (Kp): determines the response speed, excessive will cause oscillation. It is recommended to fully utilize the output range (such as 0-20mA) to avoid large output changes caused by small deviations.

Integral (Ti): Eliminating steady-state errors, the smaller the Ti, the stronger the integral effect, but if it is too small, it is prone to oscillation. When Ti=0, the integral is turned off.

Differential (Td): improves dynamic stability and is beneficial for rapid disturbances (such as static synchronization). It is usually set to 0 or very small, and the differential is turned off when Td=0.

The load distribution controller (parallel mode) adjusts the power regulation intensity through the power weight factor (PWEIGHT, 2544). 100% indicates full effort to eliminate power deviation, while lower values prioritize ensuring frequency stability. If there is a large fluctuation in power during parallel operation, the PWEIGHT can be reduced or the Kp of the frequency PID can be reduced.

Relay output regulation: If relay pulse output is used, the "ON time" (minimum pulse width) and "Period time" (period) need to be set. The regulator automatically adjusts the duty cycle according to the deviation. When the deviation is large, the pulse is long or continuous, and when the deviation is small, the pulse is short. After entering the dead zone, it stops.

Droop mode: When connected in parallel with existing droop units, frequency droop (2514) and voltage droop (2644) can be enabled, with a droop amount of 0-10%, activated through M-Logic, suitable for old units that cannot provide constant speed regulation.

Synchronization principle and parameter settings

The AGC-4 Mk II supports dynamic synchronization (default) and static synchronization (menu 2000 selection).

Dynamic synchronization: Grid connected units catch up with the bus phase at a certain slip frequency (usually positive, slightly faster than the bus). Key parameters: Sync dfMAX/dfMIN (2021/2022) allows maximum positive/negative slip, typically ± 0.3Hz; Sync dUMAX (2023) allows maximum voltage difference, typically 5%; The inherent closing time of Sync tGB/tMB (2025/226) circuit breaker is used to issue closing pulses in advance. The dynamic synchronization speed is fast and suitable for load switching, but it is necessary to ensure that the slip is positive to avoid reverse power tripping after closing.

Static synchronization: First, adjust the frequency to almost the same frequency as the bus (deviation<50mHz), and then fine tune the phase angle by the phase controller (2070). When the phase angle enters the "closing window" (2033, ± 0.1~20 °), issue a closing command. Small impact but slow adjustment, suitable for applications sensitive to impact.

Pre closing excitation (CBE): allows the unit to close without excitation and then re excite after closing, significantly reducing grid connection time and suitable for black start or emergency scenarios. MPU or EIC speed signal needs to be configured, and parameters such as closing speed threshold (2251) and excitation start delay need to be set. When CBE fails, a 2270 alarm is generated, and the fault level can be configured separately. In addition, CBE supports the "rerun" function. During the cooling period, if a new start request is received, the CBE sequence can be directly re executed without stopping the machine. The excitation state during the cooling period can be controlled through parameter 2266 (ExcCtrl cooldown) (following the bus/normally open/normally closed).

Individual synchronous relay: The closing and synchronization signals can be separated through digital input and additional relays to achieve two-step closing and prevent accidental closing.

PMS Lite Lightweight Power Management

PMS Lite is a simplified power management system designed specifically for off grid power stations, supporting up to 127 generators and allowing for quick configuration through a display screen without the need for PC software. Each controller automatically detects and assigns an ID through the CAN bus (options H12.2/H12.8), supporting load dependent start/stop, priority setting, running hour balancing, minimum operating quantity, and multi start strategy.

Load dependent start stop: Parameters 8501 (start threshold, default 90%) and 8503 (stop threshold, default 70%) determine when to request the start/stop of the next priority unit. Stop logic to consider the remaining unit load and avoid overload.