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Improvement method for space vector control of three-phase grid-connected inverter

A technology of space vector control and voltage space vector, which is applied in the field of vector control, can solve problems such as the increase of inverter output waveform harmonics and the degradation of grid-connected performance of three-phase grid-connected inverters, and reduce the number of switch on-off times , Overcoming the large switching loss and improving work efficiency

Active Publication Date: 2012-11-07
ZHANGZHOU KEHUA TECH CO LTD
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Problems solved by technology

The main loss of the three-phase grid-connected inverter comes from the loss during the turn-on and turn-off of the switching device
In order to reduce the loss of the inverter, the traditional three-phase grid-connected inverter space vector control method will reduce the operating frequency of the high-frequency switching device, which will cause the harmonics of the inverter output waveform to become larger. The three-phase grid-connected inverter The on-grid performance is degraded

Method used

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  • Improvement method for space vector control of three-phase grid-connected inverter
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  • Improvement method for space vector control of three-phase grid-connected inverter

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Embodiment Construction

[0018] 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 through specific embodiments and related drawings.

[0019] like figure 2 As shown, this embodiment provides an improved method for the space vector control of a three-phase grid-connected inverter, which adds a level of control between the three-phase duty ratio signal and the PWM output in the traditional space vector control method, and uses the query The table method corrects the three-phase duty ratio signal.

[0020] like image 3 As shown, by judging the phase angle of the voltage space vector, the look-up table is performed according to the interval of the phase angle of the voltage space vector, and the three-phase duty ratio signal is forced to be 0 or 1. The specific method is:

[0021] When the phase angle of the voltage space vector is greater than or equal to 0° and less than 60°, it can be exp...

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Abstract

The invention relates to an improvement method for space vector control of a three-phase grid-connected inverter. The improvement method includes: forcing specific-phase duty ratio signals to be 0 or 1 in the specific voltage space vector phase angle range by using a look-up table method and by judging voltage space vector phase angles. According to the method, by means of decreasing on-off times of a switching device of the grid-connected inverter, the problem of great switching loss of a switching device of a traditional space vector control grid-connected inverter is solved, temperature rise of the inverter is inhibited, operating efficiency and reliability of the three-phase grid-connected inverter is improved, and the service life of the three-phase grid-connected inverter is prolonged.

Description

technical field [0001] The invention relates to a vector control method, in particular to an improved method for space vector control of a three-phase grid-connected inverter. Background technique [0002] Three-phase grid-connected inverters are used to convert DC power into three-phase AC power, such as figure 1 As shown, its working principle is to use high-frequency switching devices to build the main circuit, and use a certain modulation method to control the working state of the high-frequency switching devices so that the output waveform is similar to a sine wave. A commonly used modulation method at present is the space vector control method. The space vector control method is to transform the eight different switching states of the three-phase full-bridge inverter through coordinate transformation to obtain eight voltage vectors, and then transform the three-phase reference voltage through the coordinate Transform to get the reference voltage vector, select several...

Claims

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Application Information

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IPC IPC(8): H02M7/48
Inventor 陈四雄甘泉曾春保
Owner ZHANGZHOU KEHUA TECH CO LTD
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