Frequency conversion generator set

Abstract

The invention discloses a frequency conversion generator set. The frequency conversion generator set comprises a multipolar generator, an output terminal, an engine connected with an input terminal ofthe multipolar generator, the input terminal and an AA-type frequency converter connected with the output terminal of the multipolar generator; and the frequency conversion generator set is characterized in that a speed increaser is arranged between the output terminal of the engine and the input terminal of the multipolar generator. With the speed increaser arranged on the output terminal of theengine, the frequency conversion generator set increases speed of the engine, increases frequency of the generator so as to further reduce degree of wave distortion of voltage output by the AA-type frequency converter and allow the AA-type frequency converter to be effectively used in the frequency conversion generator set, thus improving efficiency of the generator and reducing weight and size of the generator set. Meanwhile, cost for improvement of the frequency conversion generator set is also reduced due to very simple and convenient improvement process.

Description

technical field [0001] The invention relates to a frequency conversion generating set. Background technique [0002] Existing frequency conversion generating sets usually use the engine to drive the multi-pole generator to generate high-frequency equal-amplitude alternating current, and then convert it into 50Hz or 60Hz sinusoidal alternating current through the rectification and inverter circuit in the ADA type variable frequency converter. The above is to chop the DC at a frequency of about 20K and then filter it with an inductor to restore the output waveform to a 50Hz or 60Hz sine wave AC. Because the frequency of 20K has a lot of energy, it is easy to generate high-order harmonics and radiate to the Electromagnetic interference is produced in the air; in addition, expensive high-power semiconductor power devices and large-capacity capacitors are generally used in ADA-style rectification and inverter circuits. power generator. [0003] On the contrary, the current AA p...

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Problems solved by technology

[0007] 1. Use an engine with a higher speed to replace the current engine to increase the frequency of the generator. However, the increase in speed undoubtedly creates higher requirements for engine components, which makes the cost of the engine significantly higher; The loss is also large, the corresponding maintenance cost is also high, and there are also disadvantages of high noise and large vibration

[0008] 2. Increase the frequency of the generator by increasing the diameter of the stator of the multi-pole generator and increasing the magnetic poles. However, the result is that the volume of the generator is too large, which leads to an imbalance in the structure of the entire generator set

[0009] 3. Under the condition that the diameter of the multi-pole generator stator remains unchanged, the frequency of the generator is increased by increasing the number of magnetic pole pairs. However, the increase in the number of magnetic pole pairs reduces the slot area on the stator, making it impossible to wind and Coils that match the power, and also make the pole width of the silicon steel sheet that constitutes the magnetic pole narrow, and the strength is greatly reduced

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