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(Generator sets all over the world are assembled by engines, generators and control systems, and there is no one
The manufacturer not only produces engines, but also produces generators and control systems, and at the same time assembles and produces generator sets. So strict
(In general, all generator sets are assembled machines)
Diesel generator set is composed of diesel engine, generator, control system and other auxiliary equipment.
The structure diagram of the conventional unit is as above.
Working principle of diesel generator
In short, the diesel engine drives the generator.
In the cylinder, the clean air filtered by the air filter and the high-pressure atomized diesel sprayed from the fuel injector
The oil is fully mixed. Under the upward squeeze of the piston, the volume is reduced and the temperature rises rapidly to reach the combustion of diesel.
point. The diesel is ignited, the mixed gas burns violently, and its volume expands rapidly, pushing the piston down, which is called ‘operating
achievement'. Each cylinder performs work in a certain sequence, and the thrust acting on the piston becomes a pushing curve through the connecting rod.
The power of the shaft rotation, thereby driving the crankshaft to rotate.
Install the brushless synchronous alternator coaxially with the crankshaft of the diesel engine to use the rotating belt of the diesel engine
The rotor of the motor generator uses the principle of ‘electromagnetic induction’, the generator will output an induced electromotive force, which is closed
The load loop can generate current.
Only the most basic working principle of the generator set is described here. To get usable and stable power output,
A series of diesel engine and generator control, protection devices and circuits are also needed.
1. Diesel engine:
(1) Classification of diesel engines:
(a) According to the cooling system: air-cooled, water-cooled, open, closed
(b) According to the speed control method: mechanical centrifugal, mechanical hydraulic, electronic speed control, electronic fuel injection
(c) According to the structure: in-line, V-shaped
2. Generator
(1) Composition: stator, rotor, excitation system, automatic voltage regulation, etc.
(2) Type:
According to whether there is a brush: with brush; without brush;
Divided by excitation system: phase compound excitation; controllable phase compound excitation; third harmonic thyristor excitation; fundamental wave (auxiliary winding)
Thyristor excitation; pulse width modulation; permanent magnet machine thyristor excitation;
At present, brushless generators, fundamental wave (auxiliary winding) thyristor excitation are the mainstream products. In recent years, permanent magnets
The thyristor excitation of the thyristor is beginning to be accepted by the market.
3. Control system
Control system function: monitor and control the working process of diesel generator set, including diesel engine working parameters
Measurement display, generator power measurement display, generator output main circuit control, diesel engine, generator protection
Process control of protection and power generation group.
Control system classification:
According to the structure: (a) Integrated control box; (b) Split control panel
Classified by function:
(a) Manual type
(b) Automated
(c) Parallel type
• Manual parallel
• Automatic parallel
• Automatic parallel connection, automatic frequency modulation and load adjustment