Overview of Generator Set Composition and Working Principle
Views: 0 Author: YT Publish Time: 2021-11-17 Origin: Site
A generator set (genset) is a complete power system that converts various forms of energy into electrical energy. It is widely used in power supply, industrial production, and emergency backup applications.
According to different energy sources, generator sets can be classified into diesel, gasoline, gas, hydro, and wind power systems. Among them, diesel generator sets are the most widely used due to their high reliability, fast response, and strong adaptability.
A typical generator set consists of four core systems: power system, power generation system, control system, and auxiliary system, each working together to ensure stable and efficient power output.
1. Power System (Prime Mover)
The power system is the energy source of the generator set. Its function is to convert the chemical energy of fuel into mechanical energy to drive the generator.
In a diesel generator set, the power system mainly includes the diesel engine and its supporting subsystems such as the fuel system, lubrication system, cooling system, and starting system.
The diesel engine produces power through internal combustion in the cylinders, where fuel combustion pushes the pistons to move up and down. This linear motion is converted into rotational mechanical energy through the crankshaft.
Fuel System: Stores, filters, and injects fuel precisely into the cylinders to ensure efficient combustion.
Lubrication System: Reduces friction between moving parts and helps dissipate heat and remove impurities.
Cooling System: Maintains engine temperature within a safe range, typically using a water-cooled system.
Starting System: Provides the initial power required to start the engine, usually consisting of a starter motor and battery system.
2. Power Generation System (Electrical Conversion Core)
The power generation system converts mechanical energy into electrical energy. It mainly consists of the alternator and excitation system.
Most generator sets use a synchronous alternator, which includes a stator, rotor, and bearing system.
When the rotor is driven by the engine, it creates a rotating magnetic field that cuts through the stator windings, generating alternating current (AC) based on electromagnetic induction.
The excitation system supplies and regulates the magnetic field of the rotor, ensuring stable output voltage and enabling reactive power control and power factor regulation.
3. Control System (Intelligent Control & Protection Core)
The control system acts as the “brain” of the generator set. It manages operation control, real-time monitoring, and system protection.
It typically consists of a controller (PLC or dedicated genset controller), sensors, and a control panel.
Key functions include:
Operation Control: Start/stop control, speed regulation, and grid synchronization (for grid-connected systems).
Real-time Monitoring: Voltage, current, frequency, power, engine speed, oil pressure, and coolant temperature.
Protection Functions: Automatic shutdown in case of over speed, overload, low oil pressure, or high temperature.
The distribution system, including circuit breakers and switchgear, ensures safe power distribution and protection against electrical faults such as overload or short circuits.
4. Auxiliary System (Operational Support Systems)
The auxiliary system ensures stable and long-term operation of the generator set. Configurations may vary depending on application requirements.
Exhaust System: Discharges engine exhaust gases and reduces noise through silencers.
Vibration Isolation System: Reduces vibration impact using rubber or spring mounts.
Noise Reduction System (Optional): Includes soundproof enclosures and acoustic materials, suitable for low-noise environments such as residential or hospital areas.
ATS (Automatic Transfer Switch, Optional): Automatically switches between utility power and generator power to ensure uninterrupted power supply.
Differences Between Generator Types
Different types of generator sets vary mainly in their prime mover and system configuration:
Diesel Generator Sets: High reliability, fast start-up, widely used for industrial and emergency backup power.
Gas Generator Sets: Lower emissions, suitable for continuous operation and cleaner energy applications.
