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NPC (network parameter control) inverter mixing random SVPWM (space voltage pulse width modulation) control system and method based on Markov chain

A Markov chain and control method technology, applied in the output power conversion device, the conversion of AC power input to DC power output, electrical components and other directions, can solve problems such as high-frequency noise, electromagnetic pollution, etc., to suppress electromagnetic noise, Reduced harmonic peaks, power spectrum continuous effects

Inactive Publication Date: 2016-11-23
JIANGSU UNIV
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Problems solved by technology

[0004] In order to solve the problems existing in the prior art, the present invention proposes a Markov chain-based NPC inverter hybrid random SVPWM control system and method to solve the problems of electromagnetic pollution and high-frequency noise generated by traditional SVPWM control methods

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  • NPC (network parameter control) inverter mixing random SVPWM (space voltage pulse width modulation) control system and method based on Markov chain
  • NPC (network parameter control) inverter mixing random SVPWM (space voltage pulse width modulation) control system and method based on Markov chain
  • NPC (network parameter control) inverter mixing random SVPWM (space voltage pulse width modulation) control system and method based on Markov chain

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[0030] The technical solutions of the present invention will be described in detail below in conjunction with the accompanying drawings and specific embodiments, but the protection scope of the present invention is not limited thereto.

[0031] Such as figure 1 As shown, the topology diagram of the NPC inverter has 12 IGBT switch tubes in the figure, and every 4 IGBT switch tubes form a three-phase bridge arm, and the three-phase bridge arm is connected to the load. In high-power applications, compared with two-level inverters, it has the advantages of high switching frequency, low device withstand voltage, and good output voltage waveform.

[0032] figure 2 and image 3 Respectively represent the two-state and three-state Markov chain principles. First, the Markov process is a random process with the following characteristics: under the condition of knowing the current state, its future state is independent of its previous state, that is to say In this process, given curr...

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Abstract

The invention discloses an NPC (network parameter control) inverter mixing random SVPWM (space vector pulse width modulation) control system and method based on a Markov chain and belongs to the field of power electronic application. A three-phase sine-wave generator in the control system firstly produces a three-phase sine wave and transmits the three-phase sine wave to a SVPWM wave generator, a random number generator based on a three-state Markov chain produces a random switching frequency, a random number generator based on a two-state Markov chain produces a randomly assigned zero vector action time and transmits the vector action time to the SVPWM wave generator, and the SVPWM wave generator produces an SVPWM wave according to the received three-phase sine wave, the random switching frequency and the vector action time and transmits the SVPWM wave to a three-phase NPC topological structure. The NPC inverter mixing random SVPWM control system and method have the advantages that a harmonic wave becomes smooth at the switching frequency and integral multiples thereof, electromagnetic noise is suppressed, less electromagnetic pollution is produced, and a Markov chain random algorithm is added, so that a modulation frequency is more uniformly distributed at the periphery of an expected center frequency while advantages of a random modulation technology are guaranteed, and electromagnetic compatibility is improved.

Description

technical field [0001] The invention belongs to the application field of power electronics, and in particular relates to a Markov chain-based NPC inverter hybrid random SVPWM control system and method. Background technique [0002] Since the 21st century, power electronics technology has developed rapidly. The wide use of various power electronic equipment causes serious harmonic pollution in the power grid. Non-linear loads are harmonic sources, such as inverters, choppers, and bidirectional thyristor controllable switching devices, which seriously distort the current in the power grid. , mixed with a lot of reactive components and harmonics, not only affects the normal use of power electronic equipment, but also affects the production and transmission of electric energy. Therefore, we can find that the harm of harmonics is very serious. Power quality problems will cause equipment failure, and seriously damage the entire system, causing incalculable losses. Now, people pa...

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Application Information

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IPC IPC(8): H02M1/44H02M1/12H02M7/5387
CPCH02M1/44H02M1/12H02M7/5387
Inventor 郑宏王若隐朱文王一帆
Owner JIANGSU UNIV
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