Hysteresis loop control method for three-level inverter
A three-level inverter and hysteresis control technology, which is applied to electrical components, output power conversion devices, and AC power input to DC power output. Make full use of problems such as low switching frequency to achieve the effect of ensuring current tracking effect and improving performance
Active Publication Date: 2016-03-09
SINENG ELECTRIC CO LTD
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Problems solved by technology
When the hysteresis control selects the fixed loop width control, the switching frequency of the switching device of the inverter bridge will vary in a wide range, which will affect the filtering effect of the output filter on the switching ripple, resulting in harmonics at the output side of the inverter. Wave
Especially when the grid voltage is near zero, the switching frequency will be very low, which will lead to distortion of the output current, resulting in the advantage of the hysteresis control method not being fully utilized in the three-level inverter
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[0027]The present invention will be further described below in conjunction with drawings and embodiments. It should be understood that the specific embodiments described here are only used to explain the present invention, but not to limit the present invention. In addition, it should be noted that, for the convenience of description, only parts related to the present invention are shown in the drawings but not all content.
[0028] Please refer to image 3 as shown, image 3 A schematic diagram of a hysteresis control method for a three-level inverter provided by an embodiment of the present invention. The hysteresis control method of the three-level inverter in this embodiment specifically includes:
[0029] The output of the three-level inverter bridge has a positive level U + , Negative level U - and zero-level three states. When the inverter bridge outputs a positive level, the inverter bridge outputs current i L is on the rise. When the inverter bridge outputs a ...
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The invention discloses a hysteresis loop control method for a three-level inverter. Through calculating the actual output current change rate, the instruction current change rate, and the limited minimum switching frequency of an inverter bridge and through comparative judgment, the level state which needs to be outputted by the three-level inverter bridge is directly calculated. Reliable current hysteresis loop tracking control on the three-level inverter is realized, the minimum switching frequency for three-level inverter hysteresis loop control is limited, the current tracking effects of the three-level inverter are ensured, the inverter performance is improved, and the problem of output current distortion caused as the switching frequency, near an output voltage zero crossing point, of the traditional hysteresis loop control three-level inverter is solved.
Description
technical field [0001] The invention relates to the technical field of three-level inverter control, in particular to a hysteresis control method for a three-level inverter. Background technique [0002] Hysteresis control is a control method based on current transients. It has fast dynamic response, good robustness, simple hardware circuit, good real-time performance, and high control accuracy. It has been widely used in the field of inverter control. Hysteresis control works as figure 1 As shown, the actual output current i of the inverter bridge L and command current i ref The difference is input to the hysteresis comparator, and the hysteresis comparator generates a PWM pulse drive signal to control the on-off of the switching device in the main circuit, so as to achieve the purpose of the output current of the inverter bridge tracking the change of the current command signal. [0003] The three-level inverter has the characteristics of high efficiency, small output r...
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IPC IPC(8): H02M7/483
CPCH02M7/483
Inventor 李庆辉陈保群陈坤鹏钮良邓福伟
Owner SINENG ELECTRIC CO LTD