PWM (pulse-width modulation) method of inversing power supply of passenger train
A technology of inverter power supply and modulation method, which is applied in the direction of converting irreversible DC power input into AC power output, electrical components, output power conversion devices, etc., which can solve the problem of large output voltage harmonic value, unfavorable production promotion, switching High loss and other issues, to achieve the effect of reducing switching loss, reducing cost, and reducing harmonics
Inactive Publication Date: 2012-07-18
WUHAN ZHENGYUAN ELECTRIC
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[0002] At present, the DC600V on-board inverter power supply for passenger cars generally adopts the ordinary space vector modulation method. During the modulation process, it is necessary to use high-performance output filters and high-performance radiators, or force the air cooler to cool down. Not only the switching loss is high, but the output The voltage harmonic value is large, and the cost is high, the noise is large, and it takes up a lot of space, which is not conducive to actual production and promotion
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[0009] The present invention will be described in further detail below in conjunction with accompanying drawing and example.
[0010] The following zero vector is the zero voltage space vector Qi vector is the seven voltage space vector
[0011] Such as figure 1 The PWM modulation method of the inverter power supply for railway passenger cars includes the following steps: ①. Generate a random number using a random function, and determine the carrier ratio of the PWM modulation of the inverter power supply according to the random number; ②. Perform low switching loss processing: two Two processing methods, the first is seven vector is evenly divided on both sides and zeroed by the vector Instead, the switch sequence becomes The second is a zero vector Centered in the middle and choked by the vector Instead, the switch sequence becomes The number of times of switching in one cycle of these two methods is 4; ③, using the PWM modulation carrier ratio determined...
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The invention relates to a modulation method of a vehicular inversing power supply, in particular relates to a PWM (pulse-width modulation) method of the inversing power supply of a passenger train. The modulation method comprises the following steps of: (1) generating a random number by utilizing a random function, and adopting the random number as a carrier-to-noise ratio of PWM of the inversing power supply; (2) carrying out low-switching-loss processing, wherein seven voltage space vectors are uniformly distributed at the two sides, are replaced by zero voltage space vectors, or the zero vectors are concentrated in the middle and are replaced by seven vectors, and the switching times during one period is 4; and (3) carrying out voltage space vector modulation by adopting the PWM carrier-to-noise ratio determined by the step (1) and the low-switching-loss processing in the step (2), and after voltage space vector modulation, returning to the step (1), and carrying out next PWM of the inversing power supply. The modulation method has the advantages that the switching loss of an inverter is effectively reduced, the output voltage harmonics are reduced, and the requirement on an output filter is reduced, so that the natural cooling is realized by using a common radiator, the cost of the output filter is reduced and the noise is reduced.
Description
technical field [0001] The invention relates to a modulation method for a vehicle-mounted inverter power supply, in particular to a PWM modulation method for a railway passenger car inverter power supply. Background technique [0002] At present, the DC600V on-board inverter power supply for passenger cars generally adopts the ordinary space vector modulation method. During the modulation process, it is necessary to use high-performance output filters and high-performance radiators, or force the air cooler to cool down. Not only the switching loss is high, but the output The voltage harmonic value is large, and the cost is high, the noise is large, and it takes up a lot of space, which is not conducive to actual production and promotion. Contents of the invention [0003] The object of the present invention is to solve the above-mentioned existing problems, and provide a kind of can effectively reduce the switching loss of inverter, reduce output voltage harmonic, reduce t...
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Inventor 王旖雯王婷
Owner WUHAN ZHENGYUAN ELECTRIC