Method for controlling three-phase inverter on basis of switching among three modes
A technology of a three-phase inverter and a control method, which is applied to the output power conversion device, the conversion of AC power input to DC power output, electrical components, etc., can solve the problems of high switching frequency and large loss, etc.
Active Publication Date: 2013-12-04
SOUTH CHINA UNIV OF TECH
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However, SVPWM needs to control the three-phase inverter by switching six working modes in six different working sectors, such as figure 1 As shown in the working mode switching sequence in the first sector, each of the six power switch tubes of the three-phase bridge arm in the three-phase inverter switches once for a total of six times in one cycle. Therefore, the switching frequency is relatively high and Greater loss
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Embodiment 1
[0042] The three-phase inverter control method in this embodiment is realized through different combined control of three working modes in three different working sectors; Figure 2a-2c As shown in Table 1 below, the three working modes are: working mode U 100 , the switching tube VT 1 , VT 2 and VT 6 conduction, the switch tube VT 3 , VT 4 and VT 5 cut-off; working mode U 010 , the switching tube VT 2 , VT 3 and VT 4 conduction, the switch tube VT 1 , VT 5 and VT 6 cut-off; and working mode U 001 , the switching tube VT 4 , VT 5 and VT 6 conduction, the switch tube VT 1 , VT 2 and VT 3 deadline; if image 3 As shown, the three working sectors are divided into the counterclockwise direction on the static coordinate α-β two-phase coordinate axis with the α axis as the starting point: the first sector, 0-120 degrees; the second sector, 120- 240 degrees; and the third sector, 240 to 360 degrees.
[0043]
[0044] Table 1 Three working modes
[0045] The s...
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The invention discloses a method for controlling a three-phase inverter on the basis of switching among three modes. The method is implemented by means of differently compositely controlling the three-phase inverter in three working modes within three different working sectors, and particularly includes steps of 1), determining a sector where a voltage vector required to be outputted by the three-phase inverter is located, and acquiring two working modes of a synthesized voltage vector; 2), determining working hours of the two working modes; 3), generating a switching sequence of the two working modes according to the working hours; 4), controlling the two working modes according to the switching sequence to synthesize the voltage vector and turning the voltage vector according to a circular track to output sinusoidal voltages of the three-phase inverter. The two working modes correspond to the vector where the voltage vector is located. Compared with a method implemented by the aid of a SVPWM (space vector pulse width modulation) control strategy, the method for controlling the three-phase inverter has the advantages that under the condition that identical sinusoidal voltages are outputted, the quantity of the circuit modes is halved, the switching frequency of power switch tubes of the three-phase inverter is reduced by two-third, and accordingly the switching frequency and the loss of the three-phase inverter are effectively reduced.
Description
technical field [0001] The invention relates to a control method of a three-phase inverter, in particular to a three-phase inverter control method based on three-mode switching. It belongs to the application field of electric energy conversion. Background technique [0002] As an indispensable power electronic device in industrial applications, three-phase inverters are widely used in power systems, high-speed trains, electric vehicles, large uninterruptible power supplies (UPS), new energy power generation and other fields. However, as the power of the three-phase inverter increases and the switching frequency of the power switch tube increases, the switching loss of the power switch tube becomes larger and larger, which has become a key issue restricting the development of high power density inverters. . [0003] At present, the commonly used three-phase inverter control strategy is SVPWM (full name Space Vector Pulse Width Modulation, that is, Space Vector Pulse Width M...
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IPC IPC(8): H02M7/5387
Inventor 张波李湘峰
Owner SOUTH CHINA UNIV OF TECH