The role of diesel generator in thermal power plant

Although the power of diesel generator set is low, it is widely used in mines, railways, outdoor fields, road traffic maintenance, factories, enterprises, hospitals and other departments because of its small size, flexibility, portability, complete facilities and convenient operation and maintenance.

2. Emergency power supply

Diesel generator sets are used as emergency power supply in places that are not connected to the power grid, or when the power grid fails, and in more complex applications, such as peak shaving, power grid support and power grid output.

Extended data:

I. Principles

In the cylinder, the clean air filtered by the air filter is fully mixed with the high-pressure atomized diesel injected by the injector. Under the upward extrusion of the piston, the volume decreases and the temperature rises rapidly, reaching the ignition point of diesel oil.

The diesel oil is ignited, the mixture burns violently, and the volume expands rapidly, pushing the piston downward, which is called' doing work'. Each cylinder does work in turn according to a certain order, and the thrust acting on the piston becomes the force to push the crankshaft to rotate through the connecting rod, thus driving the crankshaft to rotate.

When the brushless synchronous alternator is coaxially installed with the crankshaft of the diesel generator, the rotor of the generator can be driven by the rotation of the diesel generator. The generator uses the principle of' electromagnetic induction' to output induced electromotive force and generate current through a closed load loop.

Second, frontier applications.

1, coordinated control of battery energy storage and diesel generator in independent AC microgrid

In the independent AC microgrid system, the coordinated control between diesel generator and battery energy storage is the key to ensure the stable operation of the system. Based on the fast response characteristics of battery energy storage, a coordinated control method of diesel generator and energy storage battery is proposed.

When the diesel generator is used as the main power supply, the auxiliary power supply control signal is introduced into the traditional droop control of the energy storage system to prevent the system from collapsing due to long-term diesel overcurrent and improve the stability of the system.

Aiming at the short-term power failure problem when the main power supply in microgrid is switched from energy storage system to diesel generator or from diesel generator to energy storage system, a seamless switching control strategy of dual main power supply of diesel generator and energy storage battery is proposed. ?

2. Modeling and operation simulation of marine diesel generator set.

The operation process of marine diesel generator set is an important part of power station operation. The number of diesel generator sets running in parallel determines the capacity of ship power station. The stability of parallel operation is closely related to the stability of ship power station.

Establishing a mathematical model that can accurately reflect the operation of diesel generator sets is of great significance to the operation control, simulation and performance analysis of power stations. The research on the parallel operation process of diesel generator sets involves the establishment of diesel generator model, parallel operation control model and power load model.

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