The AC control module is a key component in a power system, used for the operation, control, monitoring, and protection of AC power supply equipment. Here is a detailed description:

Main Functions

Voltage and Frequency Control

Maintains stable generator output voltage, such as keeping it at 600V AC.

Controls the frequency within a specified range, such as 50Hz/60Hz, to ensure power quality.

Power and Current Limiting

Sets and monitors active power and total current, taking measures to prevent overload when set values are reached.

For example, when active power reaches 100% of the set value, the output is 0VDC, and loading stops.

Protection Functions

Over-frequency/Under-frequency Protection: Triggers protection when the frequency exceeds the range (e.g., 54Hz/64Hz or 46Hz/56Hz).

Overvoltage/Undervoltage Protection: Automatically protects against voltage exceeding the range (e.g., 780VAC or 530VAC).

Reverse Power Protection: Detects and prevents reverse power conditions, taking measures when they exceed 7%.

Pulse Loss Protection: Monitors control pulses and responds immediately when they are lost.

Load Management

When a sudden load change exceeds the inherent characteristics of the diesel engine, the load loading is delayed to ensure stable system operation.

Excitation Control

AC voltage is converted to DC voltage to supply the generator exciter.

Includes bridge rectifier and thyristor rectifier circuits, automatically switching to ensure reliable generator start-up and operation.

Application Scenarios

Industrial Automation

Monitoring the current of motors, frequency converters, and other equipment to prevent faults and optimize operation.
Achieving load balancing on production lines and preventing overload tripping.

Power System and Distribution Monitoring

Monitoring incoming/outgoing circuits in power distribution rooms to ensure power supply safety.
Monitoring transformer status to prevent overload and extend service life.

New Energy Sector

Monitoring grid connection of photovoltaic inverters to ensure stable grid current and statistically analyze power generation.

Controlling charging and discharging of energy storage systems to optimize charging and discharging strategies and ensure battery safety.

Smart Home and Building Automation

Monitoring household and building electricity consumption to achieve energy-saving management and safety protection.

Upgrading smart sockets to statistically analyze electricity consumption and enable remote control.

Core Components

AC Control Module: The core control unit, such as the Rosheer 1400 AC module, used in Caterpillar 3512 series diesel generators.

Excitation Circuit Board: Converts AC voltage to DC voltage to supply the generator exciter.

Synchronization Box: Displays the voltage, frequency, and synchronization status of the generator and main busbar.

Circuit breakers, voltmeters, ammeters, etc.: Provide circuit protection and real-time data display.

Selection Considerations

Measuring Range and Accuracy: Select an appropriate measuring range and accuracy based on the range of current and voltage to be measured.

Communication Method: Select a suitable communication interface and protocol, such as RS485, Modbus RTU, etc.

Isolation and Protection: Pay attention to electrical isolation strength, operating temperature range, and protection level.

Functional Requirements: Select modules with corresponding functions based on actual needs, such as alarm output and data storage.

AC control modules play a vital role in power systems, ensuring safe equipment operation and improving energy efficiency through precise control and monitoring.