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Space vector pulse width modulation method

A space vector pulse width and modulation method technology, which is applied in the electrical field to achieve the effect of reducing the total harmonic distortion rate, simplifying the algorithm, and reducing the degree of current distortion

Inactive Publication Date: 2015-05-13
YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0013] In order to solve the above problems, the present invention provides a space vector pulse width modulation strategy and method, which can simplify the original complex problems, effectively reduce switching losses, and improve voltage utilization

Method used

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0050] The principle of simulation verification is as follows Figure 7 shown. The DC voltage is connected to the DC terminal of the inverter device through the switch, and the three-phase output of the inverter device is connected to the power grid through the auto-coupling voltage regulator. The FLUKE power analyzer is used to detect the output of the inverter device. Active and reactive control signals are generated by the control box and input to the inverter device. The equipment required for the test is shown in Table 1:

[0051] Table 1 Equipment required for the test

[0052] serial number device name 1 Inverter 2 auto voltage regulator 3 ASM125A Inverter 4 Power Analyzer, Model FLUKE NORMA4000 5 Wave recorder 6 switch S1

[0053] [0053] 1) The test results are as follows, and the leading reactive power compensation mode is shown in Table 2:

[0054] Table 2 Leading reactive power compensation mode

[0055] ...

Embodiment 2

[0066] can also be constructed as Figure 12 The experimental device shown is simulated and verified. The structure of flexible double-terminal DC transmission is symmetrical. The system voltage of 380 / 220V is converted into an input voltage of 190V through a transformer, and then connected to the air switch, charging resistor and contactor connected in parallel. 1. Connect to the three-phase IGBT bridge through the three-phase inductor. The DC side of the IGBT bridge is connected with a DC capacitor, and the contactor 2 and the DC discharge resistor are connected to the DC side. The rectifier control board first regulates the voltage from the Hall conditioning circuit board (u ab , u bc , U dc ), current (i a i b ) signal is AD converted, and then the obtained signal is calculated according to the corresponding control strategy, and the corresponding PWM pulse is output to the driver board. After amplification and level conversion, the IGBT is driven to turn on or off. Th...

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Abstract

The invention discloses a space vector pulse width modulation method; a complementary coordinate system is formed by using a K-L 120 degrees coordinate system and a 60 degrees coordinate system; complex sector judgment and duty ratio calculation are converted into amplitude comparison and addition and subtraction operations of K component and L component, thus the algorithm is simplified. Finally, a 7-section type expansion is applied to a 5-section type pulse width modulation strategy; a status of (A formula is provided) is inserted in the modulation manner, thus the harmonic wave total aberration rate can be reduced, the normal level rectification and inversion modulation are finished.

Description

technical field [0001] The invention belongs to the field of electricity, and in particular relates to a space vector pulse width modulation strategy and method. Background technique [0002] At present, the research and application of power electronic modulation technology mainly focus on pulse width modulation technology. The main modulation strategies are sinusoidal pulse width modulation, space vector pulse width modulation (SVPWM), carrier phase shift modulation (SPWM and CPS-SPWM), Nearest Level Approximation Modulation (NLM), etc. [0003] Documents such as "PWM Rectifier and Its Control Value", "New Sectorless Space Vector Pulse Width Modulation Algorithm", "Power Electronics Transformation and Control Technology", etc. introduce the prior art coordinate system sector judgment and duty cycle calculation method. The existing technology uses the α-β coordinate system sector judgment and the duty cycle calculation method to analyze as follows: figure 1 As shown, deter...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/5387
CPCH02M7/5387H02M1/0025
Inventor 沈鑫曹敏马红升丁心志张林山闫永梅
Owner YUNNAN POWER GRID CO LTD ELECTRIC POWER RES INST
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