A uniformly distributed PWM method and system suitable for three-phase power electronic converters
A three-phase electric power, evenly distributed technology, applied in the direction of converting AC power input to DC power output, electrical components, output power conversion devices, etc., can solve the problem of deteriorating conduction electromagnetic interference, etc., to reduce the volume of EMI filters, The effect of reducing external conduction interference and improving system efficiency
Active Publication Date: 2020-05-19
HUAZHONG UNIV OF SCI & TECH
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[0005] In view of the above defects or improvement needs of the prior art, the present invention provides a uniformly distributed PWM method suitable for three-phase power electronic converters, the purpose of which is to reduce conduction electromagnetic interference and switching losses, thereby solving the problem of high switching frequency Technical Problems of Silicon Carbide Converter Deteriorating Conducted Electromagnetic Interference
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[0034] In order to make the object, technical solution and advantages of the present invention clearer, the present invention will be further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, not to limit the present invention. In addition, the technical features involved in the various embodiments of the present invention described below can be combined with each other as long as they do not constitute a conflict with each other.
[0035] The present invention is based on figure 1 The modulation method developed based on the uniform distribution of switching frequency to reduce conducted EMI and switching loss is developed for the general three-phase two-level converter shown. The converter can also operate in rectifier mode. Can also run in inverter mode. The three-phase AC side can be connected to the power grid or ha...
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The invention discloses a uniform-distribution PWM method and system suitable for three-phase power electronic converter, and belongs to the technical field of the power electronics. Relative to the conventional modulation method for fixing the switching frequency, the switching frequency change is updated according to electrical angle change of the three-phase system, a statistical feature of thedesigned switching frequency time domain waveform satisfied a uniform distribution rule, and the principle of reducing the switching loss is also taken into consideration. Furthermore, the inventionfurther indicates optimal original switching frequency suitable for optimizing the output performance of a converter. Relative to the conventional modulation method for fixing the switching frequency,the conductive EMI can be maximally reduced at the frequency band of 150kHz to 5MHz through the switching frequency change, and the EMI filter volume is reduced so as to improve the power density; meanwhile, the switching loss of produced by the converter can be reduced, and the system efficiency is improved.
Description
technical field [0001] The invention belongs to the technical field of power electronics, and more specifically relates to a uniformly distributed PWM (pulse width modulation) method suitable for three-phase power electronic converters. Background technique [0002] PWM type power electronic converters are widely used in many fields of home, business and industry, such as solar photovoltaic power generation, offshore wind power, high-speed rail traction, uninterruptible power supply, flexible direct current transmission, etc. However, the application of pulse width modulation technology brings a large electrical stress (dv / dt and di / dt), which will generate conducted electromagnetic interference, affect the normal operation of the equipment and even reduce the reliability of the system. At present, power electronic equipment is constantly developing in the direction of high voltage, large capacity, high switching frequency, and high power density. Especially, the application...
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IPC IPC(8): H02M7/5387H02M1/44
CPCH02M1/44H02M7/53871
Inventor 蒋栋陈嘉楠沈泽微张野驰
Owner HUAZHONG UNIV OF SCI & TECH