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A Three-Level Space Vector Modulation Method

A technology of space vector modulation and space voltage vector, applied in electrical components, output power conversion devices, irreversible AC power input conversion to DC power output, etc., can solve the problem of large amount of calculation, slow operation speed, unfavorable hardware implementation, etc. problem, to achieve the effect of saving resources, improving work efficiency, and facilitating space vector modulation

Active Publication Date: 2022-06-21
NANJING UNIV OF SCI & TECH
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Problems solved by technology

However, in the traditional SVPWM method, the expression of the action time of the basic voltage vector contains a large number of trigonometric functions and root-finding operations, which has a large amount of calculation and slow operation speed, which is not conducive to hardware implementation.

Method used

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  • A Three-Level Space Vector Modulation Method
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  • A Three-Level Space Vector Modulation Method

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Embodiment

[0054] figure 2 It is the topology diagram of the three-phase three-level VIENNA rectifier. According to whether the bidirectional switch is turned on and the current direction is positive or negative, there are three output states for each phase, which are marked as +1, 0, and -1 respectively. image 3 It is the distribution diagram of the space voltage vector. In the figure, there are only 4 kinds of space voltage vectors with different lengths. There are 19 different vectors in total, namely: 1 zero vector with a modulo length of 0; 6 large vectors with a modulo length of 2V dc / 3; 6 medium vectors with a modulo length of 6 small vectors, modulo length V dc / 3. make modulation ratio and length each vector modulo at V dc / 2 subscripting, then the modulus length of the large vector is 4 / 3, and the modulus length of the middle vector is The modulo length of the small vector is 2 / 3, the modulo length of the zero vector is 0, and the components of the partial vector in ...

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Abstract

The invention discloses a three-level space vector modulation method. The method is as follows: starting from the three-phase stationary coordinate system, considering the rapid realization of space vector modulation, performing standard unitization on the space voltage vector, and determining the components of the voltage vector in the three-phase stationary coordinate system; partitioning large sectors, Determine the three-phase relationship of the large sector division in the three-phase static coordinate system; modify the coordinate origin to determine the revised coordinate components in the three-phase static coordinate system; divide the small sector and determine the small sector division in the three-phase The three-phase relationship in the phase-stationary coordinate system; calculate the action time of the basic vector, and determine the action time of the basic vector in the three-phase stationary coordinate system. The invention provides a simple and fast space vector modulation algorithm for the three-level VIENNA topology, which can directly realize the space vector modulation in the three-phase static coordinate system, saves resources for the processor, is convenient to realize through the program, and improves the work efficiency. efficiency.

Description

technical field [0001] The invention relates to the technical field of power electronics, in particular to a three-level space vector modulation method. Background technique [0002] In the field of high voltage and high power, the traditional two-level PWM rectifier topology is more and more difficult to meet the production needs. In order to meet the needs, a three-level PWM rectifier topology has been developed. At present, it mainly includes diode-clamped three-level rectifiers, flying capacitor clamps Bit type three-level rectifier and three-level VIENNA rectifier. Compared with the traditional two-level rectifier, the three-level rectifier has the advantages of less voltage stress on the switching tube, less harmonic content of the grid-side current, and smaller output voltage ripple. Therefore, the three-level rectifier has been widely used and has a good development prospect. [0003] At present, the modulation methods of three-level rectifiers are mainly sinusoida...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/04H02M7/217
CPCH02M7/04H02M7/2173H02M7/2176
Inventor 赵志宏吴佳衡
Owner NANJING UNIV OF SCI & TECH
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