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Method for modulating generalized vector of three-phase three-wire two-level inverter

A technology of vector modulation and three-phase three-wire, which is applied in the field of generalized vector modulation of three-phase three-wire two-level inverters, and can solve problems such as the inability to realize continuous vector modulation sliding mode switching

Active Publication Date: 2010-11-10
浙江正泰电源系统有限公司 +1
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Problems solved by technology

[0005] The present invention aims to solve the problem that the existing generalized discontinuous vector modulation method cannot realize the sliding mode switching from continuous vector modulation to discontinuous vector modulation for three-phase three-wire two-level inverter, and aims to provide a new Generalized vector modulation concept, on this basis, it is easy to realize sliding mode switching between different modulation methods

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  • Method for modulating generalized vector of three-phase three-wire two-level inverter
  • Method for modulating generalized vector of three-phase three-wire two-level inverter

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Embodiment Construction

[0023] 1. Principle of Space Vector Modulation

[0024] 1.1 Switch state to space vector transition

[0025] Three-phase three-wire two-level topology such as figure 1 As shown, the circuit is composed of three switching bridge arms, and the upper and lower switching tubes of each bridge arm are complementary conduction. The three-phase symmetrical voltage V of the inverter output aN , V bN , V cN space voltage vector

[0026] V = 2 3 ( v aN + α v bN + α 2 v cN ) - - - ( 1 )

[0027] In the formula, α=e j2π / 3 , α 2 = e j4π / 3 to represent, j is the imaginary unit.

[0028] Define the switch variable S ...

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Abstract

The invention discloses a method for modulating a generalized vector of a three-phase three-wire two-level inverter. The method comprises the following steps: (1) obtaining a space vector expected to be output by an inverter control system, wherein the space vector is named as a reference space vector Vref; (2) determining a large sector and small sector in which the Vref is positioned; (3) calculating the action time of a vector participating in synthesis; and (4) selecting a vector modulation method to synthetize a three-phase PWM signal according to the calculated action time of the space vector and needs. Compared with the existing generalized discontinuous vector modulation concept, the invention has the biggest differences that the novel generalized vector modulation method providedby the invention can be used for realizing the switching among various vector modulation methods, does not only refer to the switching among discontinuous vector modulation methods; and all the modulation methods can be unified into one method; different vector modulation methods can be realized by only amending two vector values, thus realizing the slip form switching among different modulation methods.

Description

technical field [0001] The invention relates to the field of inverters, in particular to the field of three-phase three-wire two-level inverters, in particular to a generalized vector modulation method for three-phase three-wire two-level inverters. This method can be applied to all power converters and their derivatives of the three-phase three-wire two-level inverter topology, including photovoltaic inverters, wind power converters, UPS, frequency converters, and active filters. Background technique [0002] For inverters with a power of 100kVA and above, the three-phase three-phase two-level topology is more mature than the three-phase three-wire three-level topology and is widely used. With the development of the new energy industry, the efficiency of power converters and the degree of pollution to the power grid are getting more and more attention. From the perspective of modulation methods, different modulation methods have different effects on THDi and efficiency und...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
Inventor 张彦虎张玉林
Owner 浙江正泰电源系统有限公司
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