Direct-drive wind power generation alternating current/direct current conversion circuit and control method
A technology for converting circuits and control methods, which is applied to wind power generation, AC power input conversion to DC power output, and conversion equipment without intermediate conversion to AC, which can solve the problems of high volume and cost, large value of filter capacitors and filter reactors etc. to reduce system size and cost, reduce harmonics, and simplify circuits
Active Publication Date: 2014-06-11
CHINA SCI TIANGONG ELECTRICAL HLDG
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Problems solved by technology
[0003] Due to the change of wind speed, the frequency range of the alternating current generated by the multi-pole permanent magnet synchronous generator of the direct-drive wind power system is relatively large. The parameters of the filter link on the output DC side of the rectifier bridge are generally determined by the lowest wind speed. Therefore, the filter capacitor and filter reactor The larger the value, the higher the volume and cost of the device
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[0013] In the attached drawing, the multi-pole permanent magnet synchronous generator is driven by the wind turbine to generate variable voltage and frequency alternating current, and the three-phase alternating current is rectified by a three-phase uncontrolled bridge into pulsating direct current with varying amplitude. The variable voltage pulsating direct current is directly added to the input end of the DC / DC converter without filtering, and the controller of the converter controls the duty cycle of the switching tube according to the output DC voltage requirements and the value of the current input DC voltage, and implements boost conversion control , output a specified constant DC voltage. According to the control requirements of the wind power generation system, the electric energy fed into the grid by the grid-connected inverter is related to the wind speed, and the current output by the converter remains constant under the condition of a specific wind speed. Accordin...
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The invention discloses a direct-drive wind power generation alternating current / direct current conversion circuit and a control method, which relate to an alternating current / direct current electric energy conversion circuit of a direct-drive wind power generation system. Filtering parameters of a current direct-drive wind power generation system after rectification are dependent on input voltage pulsation frequency, and a filter has a large volume, high cost, high input harmonic content and a low power factor. Alternating current output by a generator is output as variable voltage rectified alternating current after passing through a bridge type uncontrolled rectifier which is connected with a DC / DC boosting conversion circuit, and the DC / DC boosting conversion circuit controls the duty ratio of a switching tube according to an inversion input DC voltage set value by adopting a pulse width modulation (PWM) method to ensure an output voltage is constant. When in a steady state, the conversion circuit has the constant output voltage and substantially constant input current, and the generator outputs approximately rectangular wave current. When in a dynamic state, the system is regulated to fulfill the aim of outputting the constant voltage by a converter. The conversion circuit and the control method have the use that: the duty ratio of the conversion circuit is controlled to save a DC link filter, simplify the direct-drive wind power generation alternating current / direct current conversion circuit, reduce the volume and cost of the system and harmonics of the generator, and improve the system efficiency.
Description
Technical field [0001] The invention relates to an AC / DC power conversion circuit of a direct-drive wind power generation system. By adopting a certain control method, the system circuit can be simplified, the device volume and cost of the wind power system can be reduced, and the conversion of AC / DC power in the direct-drive wind power generation system can be realized. Meet the voltage requirements of the grid-connected inverter for the DC link. Background technique [0002] At present, the AC / DC power conversion circuit part of the direct-drive wind power generation system is widely used: the variable-voltage and variable-frequency AC generated by the multi-pole permanent magnet synchronous generator is rectified by a three-phase bridge-type uncontrolled rectifier circuit composed of diodes. The output pulsating variable-amplitude DC voltage is filtered by a large capacitor to obtain a relatively stable variable-amplitude DC power, and then a relatively stable DC voltage ...
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IPC IPC(8): H02J3/38H02M7/155H02M1/14H02M3/08
CPCY02E10/763Y02E10/76
Inventor 陈荣
Owner CHINA SCI TIANGONG ELECTRICAL HLDG