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60degree coordinate system based virtual vector modulation algorithm of tri-level inverter

A three-level inverter, vector modulation technology, applied in electrical components, output power conversion devices, AC power input conversion to DC power output and other directions, can solve problems such as poor real-time performance, cumbersome and other problems, and achieve enhanced real-time performance. Simple control and calculation, easy to achieve effects

Inactive Publication Date: 2014-09-03
JIANGSU UNIV
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Problems solved by technology

[0005] The purpose of the present invention is to solve the problem that the traditional virtual space vector modulation algorithm is too complicated and the real-time performance is not good. A virtual vector modulation algorithm of three-level inverter based on 60° coordinate system is proposed to simplify the original algorithm. Make the calculation simple and easy to realize the real-time control of the system

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  • 60degree coordinate system based virtual vector modulation algorithm of tri-level inverter
  • 60degree coordinate system based virtual vector modulation algorithm of tri-level inverter
  • 60degree coordinate system based virtual vector modulation algorithm of tri-level inverter

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Embodiment Construction

[0028] The present invention will be further described below in conjunction with the accompanying drawings and implementation examples.

[0029] figure 1 It is a structural diagram of the three-level NPC inverter system proposed by the invention. The system for realizing the virtual vector modulation algorithm of the three-level inverter based on the 60° coordinate system includes a coordinate transformation module, a sector discrimination and replacement module, and an action time sequence module. , a switch state decoding module, a voltage deviation acquisition module, a PI deviation adjustment module and a three-level inverter.

[0030] figure 2 It is the internal topology structure diagram of the three-level NPC inverter proposed by the present invention. The NPC three-level inverter has 12 IGBT switch tubes in total, which respectively form three-phase bridge arms, and each phase bridge arm has two diodes for voltage For clamping, the neutral point N is given by the tw...

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Abstract

The invention relates to a 60degree coordinate system based virtual vector modulation algorithm of a tri-level inverter, belonging to the field of power and electronic application. According to the algorithm, virtual space vectors (VSVPWM) are mapped into a 60degree coordinate system via Clark / Park coordinate transformation so that basic vector coordinates are changed into simple algebraic coordinates, large and small sectors are discriminated according to logic judgment of linear coordinate equations, action time of three latest basic vectors are calculated via the algebraic coordinates in a volt-second balance principle, PWM signals are output in a nine-segment switching time sequence with a positive small vector at first, and action time of redundant small vectors is adjusted via closed-loop PI regulation according to two capacitance difference values. A lot of trigonometric function and irrational number operation in a traditional VSVPWM algorithm can be omitted, and the 60degree coordinate system based virtual vector modulation algorithm is characterized by being simple in calculation, high in instantaneity and easy to realize.

Description

technical field [0001] The invention belongs to the application field of power electronics and relates to an inverter, in particular to a three-level inverter virtual vector modulation algorithm based on a 60° coordinate system. Background technique [0002] Compared with the two-level structure, the three-level inverter has the advantages of small voltage stress on each power tube, greatly reduced output harmonic content, and reduced switching loss of the power tube. Therefore, the three-level topology has been used in medium and high voltage AC It has been widely used in many fields such as transmission, grid reactive power compensation and absorption. [0003] When the inverter is running, the load current passes through the bridge arms of each phase to generate a certain AC current in the diode-clamped three-level inverter, and this current flows into the DC capacitor, resulting in an unbalanced transmission power of each capacitor on the DC bus. , the neutral point pot...

Claims

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Application Information

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IPC IPC(8): H02M7/5387H02M7/483
Inventor 郑宏徐星亮吕诚阳黄俊
Owner JIANGSU UNIV
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