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Full digital five-level inverter sinusoidal pulse width modulation (SPWM) control method

A control method and a fully digital technology, applied to electrical components, AC power input conversion to DC power output, output power conversion devices, etc., to achieve the effects of improved accuracy, small output voltage harmonic content, and improved three-phase symmetry

Active Publication Date: 2011-08-03
HUAZHONG UNIV OF SCI & TECH
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Problems solved by technology

Although the above methods can realize the digitalization of PWM, there is still a certain gap from full digitalization, and there is still a lot of room for improvement in terms of the rapidity, accuracy and stability of pulse width generation.

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  • Full digital five-level inverter sinusoidal pulse width modulation (SPWM) control method
  • Full digital five-level inverter sinusoidal pulse width modulation (SPWM) control method
  • Full digital five-level inverter sinusoidal pulse width modulation (SPWM) control method

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Embodiment Construction

[0049] According to the basic principle of five-level SPWM, the invention compares the sinusoidal modulation wave with four translational triangular carriers, and completes the on-off of each switching device of the five-level inverter according to the law according to the asymmetric rule sampling principle and the comparison result. In the off state, the full digitalization of the SPWM function is realized by using FPGA. The block diagram of the digital control algorithm is as follows: figure 1 shown.

[0050] The technical scheme adopted by the present invention to solve its technical problems is: provide a kind of all-digital five-level SPWM control method based on FPGA, the digitized functional block diagram is as follows figure 1 As shown, the digital composition includes: control command reception, synchronization signal generation, sine wave modulation wave generation, dead time and minimum pulse width setting, switching time calculation, and five-level pulse width cont...

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Abstract

The invention discloses a full digital five-level inverter sinusoidal pulse width modulation (SPWM) control method. In the method, a sinusoidal modulation waves are compared with four translation triangular carrier waves, and based on an asymmetric regular sampling principle and the comparison result, the switch-on and switch-off states of each switch device of a five-level inverter are completedin accordance with the rules. By the method, full digital control is realized, so that the five-level SPWM control response speed is higher, the pulse width control precision is higher, an output voltage has a lower harmonic content, the three-phase symmetry degree is more excellent, and a program can be conveniently and flexibly modified for meeting the requirements of various high performance control places.

Description

technical field [0001] The invention belongs to the technical field of power electronics, and in particular relates to a fully digital five-level sinusoidal pulse width modulation (Sine pulse width modulation, SPWM) control method. Background technique [0002] In recent years, the concepts of smart grid and micro-grid have been continuously proposed; new energy and distributed power technologies have developed rapidly, and electrical energy-saving and power quality control devices have been widely used. Many of these systems require power electronics-based large (Medium) power device, in order to improve the output capacity and voltage level of the system, the application of multi-level inverter circuit is getting deeper and deeper, among which the three-level inverter circuit has been more maturely applied, and the five-level inverter circuit The application is still in the exploratory stage, and the pulse width modulation of the inverter is one of the key technologies, es...

Claims

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Application Information

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IPC IPC(8): H02M7/5395H02M7/483
Inventor 尹项根刘健张哲文明浩熊卿王存平
Owner HUAZHONG UNIV OF SCI & TECH
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