A self shunt excitation AC excitation electricity generating device

Abstract

The invention discloses a self-shunt excitation AC excitation power generation device, which includes an AC excitation generator and an excitation transformer. The original side of the excitation transformer is composed of a main excitation winding and a control winding. The output end of the secondary winding of the excitation transformer is connected to the input end of the excitation winding in the AC excitation generator, and the control winding is powered by its power supply. The invention can change the excitation input to the AC excitation generator by adjusting the amplitude and phase of the input quantity of the control winding of the excitation transformer, thereby controlling the operation of the generator. Therefore, when the rotation speed of the motor rotor is n, a stable AC output with a frequency of f=n·p / 120Hz can be obtained at the machine end of the AC excitation generator. The invention also has the advantages of high utilization rate of the excitation transformer, good waveform of the alternating current, simple structure and high operation reliability.

Description

technical field [0001] The invention relates to a power generating device, more specifically to a self-shunt AC excitation generating device. Background technique [0002] Conventional generators are mostly synchronous generators using DC excitation, and the frequency of the alternating current generated by them is f=n p / 60Hz, where n is the rotational speed of the rotor in rpm (rev / min), and p is the speed of the synchronous motor Extreme logarithm, the range of values ​​is natural numbers. Therefore, if a conventional DC excitation synchronous generator wants to generate AC power with a power frequency of 50Hz (or 60Hz), its prime mover speed must be limited within 3000rpm (or 3600rpm); and when n is low, only by increasing the number of pole pairs of the motor p to make f reach the power frequency 50Hz (or 60Hz). [0003] AC excitation generator is a generator that uses two-phase or three-phase alternating current for excitation. Taking the rotating magnetic pole motor ...

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Problems solved by technology

[0004] In the current AC excitation generator set, the AC excitation current is generally supplied by the frequency converter, which has two disadvantages: first, the quality of the voltage waveform output by the frequency converter is not good, resulting in poor quality of the AC power generated by the generator set; second, The power required by the AC excitation system is relatively large, so the capacity of the frequency converter is required to be large, so that the cost and loss increase accordingly, and it also makes it more difficult to solve the electromagnetic compatibility problem

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