A space vector modulation method for three-phase three-level inverter circuit
A technology of space vector modulation and three-level inverter, which is applied in the direction of converting AC power input to DC power output, electrical components, and output power conversion devices, etc., and can solve problems that are difficult to implement, increase the amount of real-time control calculations, and complicate formulas and other problems, to achieve the effect of simple algorithm structure, improved operation efficiency, and reduced calculation amount
Inactive Publication Date: 2017-07-28
上海兆能电力电子技术有限公司
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Such division results in an increase in the amount of real-time control calculations and complex formulas that are difficult to implement
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[0041] The present invention will be further elaborated below by describing a preferred specific embodiment in detail in conjunction with the accompanying drawings.
[0042] A space vector modulation method for a three-phase three-level inverse converter circuit disclosed by the present invention is suitable for applications similar to figure 2 The SVPWM modulation method in the three-phase three-level inverter circuit system shown.
[0043] Such as figure 1 As shown, a space vector modulation method for a three-phase three-level inverter circuit, the method includes:
[0044] S1, construct a 120° plane coordinate system. The step S1 includes the following steps:
[0045] S1.1, if image 3 As shown, establish the m-axis and the n-axis with an angle of 120° with the m-axis, so that the angles between the m-axis and the n-axis in the first quadrant and the third quadrant are both 120°, and the m-axis and the n-axis are in the second quadrant , The included angle of the fou...
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The invention discloses a space vector modulation method for a three-phase three-level inverse converter circuit. A 120-degree planer coordinate system is used, the effective time of a switch state combination of the three-phase three-level inverse converter circuit can be calculated directly through a coordinate transformation relation, characteristics of an outputting reference value of the three-phase three-level inverse converter circuit and a voltage vector relational expression of the three-phase three-level inverse converter circuit, and actions of a switch device are controlled. Compared with the prior art, the space vector modulation method has the advantages that the calculated quantity is greatly reduced and an algorithm structure is simple. The calculation efficiency of the three-phase three-level inverse converter circuit is much higher than that of the traditional three-level SVPWM (space vector pulse width modulation). The error rate caused by the complex algorithm in the prior art can be avoided effectively.
Description
technical field [0001] The invention relates to the field of inverter control, in particular to a space vector modulation method for a three-phase three-level inverter circuit. Background technique [0002] Multilevel inverters are suitable for large-capacity and high-voltage applications, and have been used more and more. Among the various control strategies of multilevel inverters, the space vector modulation algorithm has the advantages of large modulation ratio, optimized output voltage waveform, easy digital implementation, and high bus voltage utilization, and has become a hot spot of concern. [0003] Since the three-level inverter and the traditional two-level inverter have the following advantages: it is more suitable for high-power and high-voltage occasions; it reduces the harmonic content of the output waveform; it reduces the switching loss, etc., so its control method has also become A hot topic. Among various PWM methods, since SVPWM takes the instantaneous ...
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IPC IPC(8): H02M7/483H02M7/5387
CPCH02M7/483H02M7/5395
Inventor 李丹郑洪涛
Owner 上海兆能电力电子技术有限公司