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A fast three-phase space vector modulation method in two-dimensional coordinate system

A modulation method and space vector technology, which can be used in output power conversion devices, climate sustainability, high-efficiency power electronic conversion, etc., and can solve the problems of single function, not easy to expand, and no outstanding contribution to multi-level converter performance. , to achieve the effect of eliminating common mode voltage, optimizing switching action sequence, reducing switching loss and harmonic output

Active Publication Date: 2020-09-15
SOUTHWEST JIAOTONG UNIV
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Problems solved by technology

However, it is still necessary to list the vectors one by one in the vector allocation, and it is still not easy to expand, and these algorithms have a single function and can only realize the basic synthesis of the reference voltage vector, and have no outstanding contribution to optimizing the performance of other aspects of the multi-level converter.

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  • A fast three-phase space vector modulation method in two-dimensional coordinate system
  • A fast three-phase space vector modulation method in two-dimensional coordinate system
  • A fast three-phase space vector modulation method in two-dimensional coordinate system

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Embodiment Construction

[0053] The present invention will be further described below in conjunction with accompanying drawing: The proposed algorithm of the present invention is applied to any multilevel converter such as figure 1 Shown, including diode clamped multilevel, cascaded multilevel and modular multilevel. Figure 2(a) is the space vector diagram of the five-level converter. Coordinate change from Figure 2(a) transforms the three-phase 120-degree coordinate system into a two-phase Cartesian coordinate system as shown in Figure 2(b). H in the picture 0 ~H 3 They are two-level to five-level space vector planes respectively. When the vector closest to the origin is detected, the multi-level modulation space is simplified to a two-level space as shown in Figure 3(a) and (b). It can be seen that the synthesized reference voltage vector in a modulation triangle has two modes of step-up and step-down, and the switching state of each phase only changes by one unit in one switching cycle. At thi...

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Abstract

The invention provides a three-phase space vector rapid modulation method in a two-dimensional coordinate system, which belongs to the technical field of power electronic modulation. This method transforms the traditional three-phase two-dimensional coordinate system into a new two-dimensional rectangular coordinate system, and obtains the remaining two vectors of the modulation triangle by directly checking the vector closest to the origin, which has strong scalability. In addition, this method can provide several controllable factors, and the factor N can be used as an optimization target to weaken the common-mode voltage and select redundant vectors for voltage equalization; the controllable switching sequence produced can ensure the smooth transition of vectors in the modulation triangle and between modulation triangles To reduce the overall switching frequency of the system to reduce switching loss and optimize harmonic performance; adjustable zero-vector duty cycle can also optimize harmonic performance, synthesize a more ideal flux linkage circle to output high-quality sine waves and ensure the same voltage as the factor N balanced. The function of this method reflects its superior application value and good application prospect.

Description

technical field [0001] The invention belongs to the technical field of electric power electronic modulation. Background technique [0002] Space vector modulation (SVPWM) is a pulse width modulation method based on the concept of space voltage vector synthesis, which has been widely used in power electronic modulation. Its core idea is to use the different switching states of the converter as the basic action vector, and synthesize the reference voltage vector according to the selected basic vector and its specific action time. Compared with the ordinary PWM modulation algorithm, it has many outstanding advantages: high voltage utilization rate, easy digital realization, good output waveform quality, close to sinusoidal, reasonable arrangement of space vector, can reduce switching frequency, reduce switching loss, and use SVPWM The redundant vector of the multi-level converter can realize the voltage balance of the multi-level converter, can eliminate the common mode voltag...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/483H02M7/5387H02M1/12
CPCH02M1/12H02M7/483H02M7/53875H02M1/0054H02M1/123H02M7/53876Y02B70/10
Inventor 舒泽亮林宏健雷园毛文君闫晗钱奕何晓琼
Owner SOUTHWEST JIAOTONG UNIV
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