DEIF AGC-2 Controller: The Ultimate Guide to Automatic Control and Protection of Generator Sets

DEIF AGC-2 Controller: The Ultimate Guide to Automatic Control and Protection of Generator Sets

In the modern power supply system, diesel generator sets serve as backup power sources, islanded power sources, or core equipment for grid connected operation. The reliability, flexibility, and intelligence level of their control systems directly determine the quality of power supply and operational safety. Traditional control schemes based on discrete components or simple logic are no longer sufficient to meet increasingly complex application scenarios, such as automatic mains fault switching, multi machine parallel connection, peak shaving, and hybrid operation with renewable energy.

In this context, the AGC-2 Multi line 2 automatic generator set controller launched by DEIF, as a comprehensive control unit based on microprocessors, highly integrates the protection, control, measurement, and communication functions of the generator. It is not only the brain of the generator set, but also the digital bridge connecting the unit with the upper monitoring system. This article will deeply analyze the hardware architecture, core functions, operating modes, and engineering debugging points of AGC-2, providing engineers with comprehensive technical references from theory to practice.

System Overview and Hardware Architecture: Building a Robust Hardware Platform

Understanding the hardware design philosophy of AGC-2 is the primary step towards successful application and troubleshooting. This controller is designed specifically for applications ranging from small to large generator sets, with its notable features being modularity and scalability.

1. Core processing and measurement unit

AGC-2 is equipped with a complete three-phase voltage and current measurement circuit, which can collect real-time electrical parameters of the generator, busbar, and mains power. All measurement values and alarm information can be clearly displayed on the LCD screen, which supports remote installation and provides convenience for human-computer interaction. The controller uses high-performance microprocessors internally to ensure real-time computation of complex protection algorithms (such as ANSI standard protection) and PID control laws.

2. Flexible I/O interface configuration

The strength of AGC-2 lies in its highly flexible input-output interface, which allows it to adapt to various engine and switchgear configurations.

Engine interface card: The standard configuration provides multiple engine interface cards (such as M1, M2), supporting different types of sensors and actuators. For example, the M1 interface card provides 2 configurable digital inputs and 3 digital outputs, while the M2 tab expands with more digital inputs and VDO analog inputs for direct connection to sensors such as oil pressure, water temperature, fuel level, etc., without the need for additional transmitters.

Analog input: The controller supports multiple types of analog input. In addition to receiving standard 4-20mA signals for measuring oil pressure, liquid level, or power signals from external transmitters, it also supports PT100 and VDO sensors, providing direct interfaces for non electrical quantity monitoring such as temperature and pressure.

Digital quantity and relay output: AGC-2 is equipped with freely configurable digital inputs and relay outputs. These I/O points can be flexibly programmed through the onboard M-logic logic configuration tool, enabling simple alarm indication to complex logic interlocking control, such as "start preparation" relay, circuit breaker opening and closing control, "idle running" control, etc.

Deep analysis of operating modes: from standard applications to advanced strategies

The strength of AGC-2 lies not only in its hardware, but also in the various specialized operating modes preset in its firmware, which can cover almost all application scenarios from single machine to multi machine, from islanding to grid connection.

1. Automatic Mains Fault Switching (AMF)

This is one of the core application modes of AGC-2. When the mains power is normal, the load is powered by the mains power and the generator is in standby mode.

Fault detection and startup: When the controller detects that the mains voltage or frequency exceeds the set threshold (set through menu 6590 Mains failure voltage and 6600 Mains failure frequency) and after a delay confirmation (tFD, i.e. Mains failure delay), the generator set will be automatically started.

Switching logic: AGC-2 supports two switching logics: one is "disconnect first and then close", which means that the mains circuit breaker is disconnected while starting the generator, and then the generator circuit breaker is closed when the generator voltage/frequency meets the standard; The second is "generator priority", which means starting the generator first and waiting for its voltage/frequency to meet the standard, then disconnecting the mains circuit breaker and closing the generator circuit breaker. Users can select through the 6595 Mains fail. control parameter.

Mains recovery and return: When the mains is restored and confirmed by the Mains OK delay, the controller will perform a reverse switch. If the "Back synchronization" function is enabled, the generator circuit breaker will synchronize with the mains power to achieve seamless load transfer and avoid impact on the load; Otherwise, the conversion of "break first, then close" will be executed.