UAD215A104 3BHE026284R0104 | ABB CSI Converter signal interface

Description

excitation
Generally, the process of forming a rotating magnetic field in the generator rotor according to the principle of electromagnetic induction is called excitation. In addition, providing a working magnetic field for generators and other "electrical equipment that works on the principle of electromagnetic induction" is also called excitation. Sometimes, the device that provides rotor power to the generator rotor is also called excitation.
With the development of electric power construction, China's power system industry has entered the stage of large network, high voltage and large unit. The stability of large capacity units during operation is very important to the stability and security of the overall power grid. However, it is the motor excitation system that affects the stability of the generator most. Excitation system plays a very important role in power grid security, which is not only the guarantee of stable operation of the unit, but also the lever of reactive power and voltage regulation in the whole power grid.
Main role
1, maintain the generator terminal voltage at the given value, when the generator load changes, by adjusting the strength of the magnetic field to maintain the machine terminal voltage.
2, reasonable distribution of reactive power distribution between parallel running units.
3, improve the stability of the power system, including static stability, transient stability and dynamic stability.

Dc classification
The excitation mode of DC motor can be divided into four categories: separate excitation, parallel excitation, series excitation and compound excitation.
Rectification classification
1. Rotary excitation
Rotary excitation also includes DC AC and brushless excitation.
2. Static excitation
Static exciter includes potential source static exciter and composite source static exciter.

Exciting machine
Ac power supply mode according to generator excitation
1. Ac excitation (separate excitation) system
It is powered by an AC exciter coaxial with the generator. The system can be divided into four ways:
1) AC exciter (magnetic field rotation) plus static silicon rectifier (brush).
2) AC exciter (magnetic field rotation) plus static thyristor rectifier (brush).
3) AC exciter (armature rotation) plus silicon rectifier (brushless).
4) AC exciter (armature rotation) plus thyristor rectifier (brushless)..
2. Full static excitation (self-excitation) system
When the excitation transformer is connected to the machine end of the generator or to the plant power bus of the unit generator set, it is called self-excited excitation mode, and the excitation transformer at the machine end and the excitation converter in series of the generator stator are combined to supply power to the generator rotor. There are also four kinds of this combination method:
1) Connect the DC side in parallel
2) DC side in series
3) Parallel AC side
4) AC side in series

effect
1. Adjust the excitation current according to the change of the generator load to maintain the machine terminal voltage as the given value;
2. Control reactive power distribution among generators in parallel operation;
3. Improve the static stability of parallel operation of generators;
4. Improve the transient stability of generators running in parallel;
5. When there is a fault inside the generator, the magnetic field is removed to reduce the degree of fault loss;
6. Implement maximum excitation limit and minimum excitation limit on generator according to operation requirements.

Dc generator
This type of excitation generator has a special DC generator, the special DC generator is called DC exciter, the exciter is generally coaxial with the generator, the generator's excitation winding through the slip ring installed on the large shaft and fixed brush from the exciter to obtain DC current. This excitation mode has the advantages of independent excitation current, reliable operation and reducing self-use electricity consumption, etc., is the main excitation mode of generators in the past decades, and has more mature operation experience. The disadvantage is that the excitation regulation speed is slow and the maintenance workload is large, so it is rarely used in units above 10MW.

Ac exciter
Some modern high-capacity generators use AC exciter to provide excitation current. Ac exciter is also installed on the main shaft of the generator, and its output alternating current flows through the rectifier to supply the generator rotor excitation, at this time, the excitation mode of the generator belongs to the other excitation mode, and because of the static rectifier device, it is also known as the static excitation, AC secondary exciter provides excitation current. The AC secondary exciter can be a permanent magnet machine or an alternator with a self-excited constant voltage device. In order to improve the speed of excitation regulation, the AC exciter usually uses an intermediate frequency generator of 100-200HZ, and the AC secondary excit

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