A brushless doubly-fed power generation system and its control method

Abstract

The invention discloses a brushless doubly-fed power generation system and a control method thereof, which belong to the field of motor power generation. The control method includes: S1: collecting the rotational speed signal of the brushless doubly-fed motor and setting the expected frequency of the power winding; using the rotational speed Calculate the desired frequency of the control winding from the relationship between the two sets of stator winding frequencies; S2: Input the desired frequency of the control winding to the inverter, so that the inverter can adjust the voltage of the control winding separately in the V / F separation control mode and frequency, to ensure that the power winding of the brushless double-fed motor works at the rated operating point under the condition of variable speed; S3: Obtain the actual DC bus voltage, and use the difference between the actual DC bus voltage and the target DC bus voltage and the difference change Dynamically adjust the PI parameters to adjust the actual DC bus voltage to the target DC bus voltage and realize the constant voltage control of the DC bus. The invention has good dynamic response, high robustness, and provides stable DC bus voltage.

Description

technical field [0001] The invention belongs to the field of motor power generation, and more specifically relates to a brushless double-fed power generation system and a control method thereof. Background technique [0002] With the development of human society and the improvement of material level, the problem of energy shortage has become increasingly prominent. Therefore, the development and utilization of clean renewable energy and the improvement of energy conversion equipment to increase energy utilization have become research hotspots in recent years. [0003] Due to its reliable structure and flexible excitation adjustment, brushless doubly-fed motors have broad application prospects in variable speed power generation fields such as wind power, hydraulic power, and ship shafts, and have attracted much attention in recent years. [0004] However, due to the complex mathematical model of the brushless doubly-fed motor, it is difficult to realize the fully decoupled v...

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Problems solved by technology

[0005] Aiming at the above defects or improvement needs of the prior art, the present invention provides a brushless doubly-fed power generation system, the purpose of which is to solve the traditional brushless doubly-fed power generation system with complex adjustment of the control system, slow dynamic response and stable DC bus voltage technical problems of poor sex

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