A Modulation Method of Brushless DC Motor System Using Small Capacitance in DC Link
A brushed DC motor and modulation method technology, applied in AC motor control, single-phase motor control, control system and other directions, to achieve the effect of reducing the total switching times, simplifying the design of the controller, and improving the efficiency
Active Publication Date: 2020-10-02
TIANJIN POLYTECHNIC UNIV
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The two methods proposed in the existing literature fail to meet the above two goals at the same time
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[0024] A modulation method of a brushless DC motor system using a small capacitance in the DC link of the present invention will be described in detail below in conjunction with the embodiments and the accompanying drawings.
[0025] A modulation method of a brushless DC motor system using a small capacitor in the DC link of the present invention is used for such as figure 1 The rectification stage shown uses a single-phase diode rectifier bridge, the inverter stage uses a three-phase inverter bridge, and the DC link uses a DC link switching tube connected in series with a DC link capacitor for topology modulation. The modulation method is to judge the output voltage of the single-phase diode rectifier bridge |u in each control period s |The area to which it belongs, when the output voltage of the single-phase diode rectifier bridge |u s When entering area 1, in area 1, only one of the six switching tubes of the three-phase inverter bridge is controlled to chop at an indeterm...
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The invention discloses a modulation method of a brushless direct current motor system with a small capacitor as a direct current link. The method is used for modulation of a topology structure in which a single-phase diode rectifier bridge is used for a rectification stage, a three-phase inverter bridge is used for an inversion stage, and a direct current link switch tube and a direct current link capacitor are connected in series for the direct current link. The modulation method comprises the following steps: a region which an output voltage |us| of the single-phase diode rectifier bridge belongs to is judged in each control period; when the output voltage |us| of the single-phase diode rectifier bridge enters a region 1, only one of six switch tubes of the three-phase inverter bridge is controlled to perform wave chopping at a variable frequency in the region 1; and when the output voltage |us| of the single-phase diode rectifier bridge enters a region 2, only the direct-current link switch tube connected with the direct-current link capacitor in series is controlled to perform the wave chopping at the variable frequency. According to the modulation method of the brushless direct current motor system with the small capacitor as the direct current link, the wave chopping of the direct current link switch tube is ensured on the premise of avoiding simultaneous wave chopping of the direct current link switch tube and the switch tubes of the inverter bridge and not increasing the number of the total switching times of a current transformer.
Description
technical field [0001] The invention relates to a brushless direct current motor system. In particular, the invention relates to a modulation method of a brushless direct current motor system using a small capacitor in the direct current link. Background technique [0002] Brushless DC motors have the advantages of simple structure and high power density. In a brushless DC motor system powered by a single-phase AC power supply, a large-capacity electrolytic capacitor is generally required at the output of the single-phase diode rectifier bridge to maintain a stable DC link voltage. However, large-capacity electrolytic capacitors will increase the volume and weight of the system and reduce the power density of the brushless DC motor system converter. [0003] Focusing on the problems caused by large-capacity electrolytic capacitors, the DC link capacitor-free topology has become a research direction in recent years. The matrix converter is a typical capacitor-free AC-AC con...
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IPC IPC(8): H02M5/458H02P6/26H02P25/04
CPCH02M5/458H02P6/26H02P25/04
Inventor 李新旻郑碧凝陈炜史婷娜夏长亮
Owner TIANJIN POLYTECHNIC UNIV