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Effective switching time based pulse width modulation method for three-phase four-switch inverter

A three-phase four-switch, switching time technology, which is applied in the equal direction of irreversible DC power input conversion to AC power output, can solve problems such as limiting the flexibility of the algorithm and changing the construction method of the equivalent zero vector.

Active Publication Date: 2016-09-07
ZHEJIANG UNIV
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Problems solved by technology

However, using this pulse width modulation method to obtain the moment when the switch tube starts to trigger conduction within a modulation period, the construction method of the equivalent zero vector cannot be flexibly changed according to the needs, which further limits the flexibility of the algorithm

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  • Effective switching time based pulse width modulation method for three-phase four-switch inverter
  • Effective switching time based pulse width modulation method for three-phase four-switch inverter
  • Effective switching time based pulse width modulation method for three-phase four-switch inverter

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Embodiment Construction

[0039] In order to describe the present invention more specifically, the technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0040] The pulse width modulation method in this embodiment is implemented based on a three-phase symmetrical resistive load system powered by a three-phase four-switch inverter. like image 3 As shown, the three-phase four-switch inverter is composed of a DC power supply, a capacitor C1 connected to the positive pole of the power supply, a capacitor C2 connected to the negative pole of the power supply, and a power switch tube. like Figure 4As shown, the permanent magnet synchronous motor system powered by the three-phase four-switch inverter in this example consists of a three-phase four-switch inverter 1, a three-phase symmetrical resistive load 2, a controller 3, a DC bus voltage sensor 4, and a capacitive voltage sensor 5 composition. The phase A...

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Abstract

The invention discloses an effective switching time based pulse width modulation method for a three-phase four-switch inverter. The effective switching time of a switch tube within a modulation period is obtained by calculation based on the modulation voltage, the direct current bus voltage, the capacitive voltage and the modulation period of the inverter; the fluctuation of the capacitive voltage is taken into consideration; and the effective switching time can be adjusted in real time according to the fluctuation of the capacitive voltage. By moving the position of the effective switching time within one modulation period, the configuration way of the equivalent zero vector can be flexibly changed, and the obtained each switch tube driving signal can be used for driving and controlling the inverter. In addition, by adoption of the pulse width modulation method, a determination link for the section of the target voltage vector is omitted, so that the calculation process is greatly simplified; and therefore, the pulse width modulation method can be applied to the control field of the three-phase four-switch inverter, such as control on the inverter in a motor driving system, a grid-connected inverter or an active filter which are powered by the three-phase four-switch inverter.

Description

technical field [0001] The invention belongs to the technical field of inverter control, and in particular relates to a three-phase four-switch inverter pulse width modulation method based on effective switching time. Background technique [0002] With the rapid development of power electronic devices and their control technologies, power electronic inverters have been widely used in occasions such as frequency conversion and speed regulation of AC motors and new energy power generation. Among them, the power switching device and its driving circuit are important components of the inverter, and also the weakest link most prone to failure, and an important factor restricting the reliability of the system. Once the inverter fails, if the relevant remedial measures are not taken, it will cause a secondary failure of the system and seriously affect the safety of the system operation. If the failure occurs in important occasions such as transportation and aerospace, it will caus...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 孙丹苏均攀周文志
Owner ZHEJIANG UNIV
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