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Unipolar Controlled Three-Phase Two-Level Inverter Space Voltage Vector Modulation Method

A technology of space voltage vector and modulation method, which is applied to electrical components, output power conversion devices, AC power input conversion to DC power output, etc., and can solve problems such as dead zones

Active Publication Date: 2016-04-13
LISHUI UNIV
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  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0005] The purpose of the present invention is to solve the unavoidable technical problem of the dead zone problem of the space voltage vector modulation method of the bipolar control three-phase two-level inverter existing in the prior art

Method used

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  • Unipolar Controlled Three-Phase Two-Level Inverter Space Voltage Vector Modulation Method
  • Unipolar Controlled Three-Phase Two-Level Inverter Space Voltage Vector Modulation Method
  • Unipolar Controlled Three-Phase Two-Level Inverter Space Voltage Vector Modulation Method

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Embodiment Construction

[0017] The present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments.

[0018] The main circuit of the inventive method is as figure 1 The main circuit of the three-phase two-level voltage type inverter is shown.

[0019] The figure shows a three-phase two-level voltage inverter, and the load is a three-phase motor. In actual use, the motors can be connected in star or delta as shown in the figure.

[0020] Upper tube VT 1 and down tube VT 4 It is a switch tube with two internal parallel diodes (insulated gate bipolar transistor IGBT, or metal oxide silicon field effect transistor MOSFET), and the two tubes form a half bridge called bridge arm a. VT 3 and down tube VT 6 Form bridge arm b, VT 5 and down tube VT 2 Form bridge arm c. Similarly, the three output terminals a, b, and c of the three bridge arms are respectively connected to one end of the three-phase winding of the motor (the motor is star-conn...

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Abstract

The invention discloses a single-polarity-controlled three-phase two-level inverter space voltage vector modulation algorithm, which is characterized in that a carrier triangular wave or a sawtooth wave controlled by a single polarity and a group of modulation waves expressed by utilizing a piecewise function are used, and an on-off signal is transmitted from an intersection point of the carrier wave and the modulation wave so as to realize the three-phase two-level inverter space voltage vector modulation. By adopting the algorithm, not only the same modulation effect with the conventional three-phase two-level inverter space voltage vector modulation algorithm SVPWM be realized, such as the voltage utilization rate is high, and a circular magnetic chain is generated, but also no dead-corner protection requirement is needed, the waveform distortion problem can be avoided, the on-off times can be half reduced, and the algorithm has the advantage that the on-off loss is small.

Description

technical field [0001] The invention relates to a three-phase two-level inverter space voltage vector modulation method, in particular to a three-phase two-level inverter space voltage vector modulation method based on unipolar control. Background technique [0002] Several methods are commonly used for three-phase two-level inverter modulation: bipolar control sinusoidal pulse width modulation (SPWM) and space voltage vector method (SVPWM), SPWM with third harmonic injection, based on discontinuous modulation waves DPWM0, DPWM1, DPWM2, DPWMMAX, DPWMMIN and other modulation methods. [0003] All the modulation methods mentioned above are based on bipolar control. Bipolar control requires that the states of the upper and lower tubes of the bridge arm are complementary, that is, when the state is "1": when the upper tube is turned on, the lower tube is turned off; when the state is "0", : The lower tube is open, and the upper tube is closed. In the process of switching from ...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
Inventor 陈凯
Owner LISHUI UNIV
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