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Three-level inversion modulation method

A technology of three-level inverter and three-level inverter, which is applied in photovoltaic power generation, electrical components, and conversion of AC power input to DC power output, etc. It can solve the problems of space vector modulation EMC deterioration and reduce the difficulty of control , Improve the effect of utilization, wide input voltage range

Inactive Publication Date: 2015-02-18
SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD
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  • Abstract
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  • Claims
  • Application Information

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Problems solved by technology

It can overcome the problem of SVPWM space vector modulation EMC deterioration, and can make the photovoltaic three-phase grid-connected inverter suitable for a wide input voltage range

Method used

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Embodiment Construction

[0012] The present invention will be further described below in conjunction with the accompanying drawings and embodiments, but not as a basis for limiting the present invention.

[0013] Example. A three-level inverter modulation method is characterized in that: in a basic three-phase inverter circuit (such as figure 1 shown) based on the real-time sampling bus voltage U dc and inverter output voltage U o , and the DSP performs a comparison operation on the two, and according to the difference of the comparison result, the inverter modulation mode is switched between the two modulation methods of SVPWM space vector modulation and SPWM sinusoidal pulse width modulation. When DSP calculates U dc -K*U o ≤C, the SVPWM space vector modulation is performed by DSP; otherwise, if U dc -K*U o >C, the DSP performs SPWM sinusoidal pulse width modulation, when U dc -K*U o ≤C, and K*U o dc , then the DSP performs SVPWM space vector mo...

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Abstract

The invention discloses a three-level inversion modulation method. The three-level inversion modulation method includes sampling bus voltages U<dc> and inversion output voltages U<o> in real time on the basis of a basic three-phase inversion circuit comprising an 'I'-shaped three-phase three-level inverter, bus capacitors and a three-phase LC filter circuit; comparing and computing the bus voltages U<dc> and the inversion output voltages U<o> by the aid of a DSP (digital signal processor); switching inversion modulation modes between an SVPWM (space vector pulse-width modulation) process and a SPWM (sinusoidal pulse-width modulation) process according to the difference between comparison results. The three-level inversion modulation method has the advantages that the problem of deterioration of the EMC (electromagnetic compatibility) due to SVPWM can be solved, and the photovoltaic three-phase grid-connected inverter can be applied to wide input voltage ranges.

Description

technical field [0001] The invention relates to a three-level inverter modulation method, in particular to a three-level inverter modulation method applied to a photovoltaic three-phase grid-connected inverter. Background technique [0002] Existing photovoltaic three-phase grid-connected inverters mostly use a three-level inverter bridge for inversion, and the high-frequency modulation method of the inverter is mostly SVPWM space vector modulation. SVPWM is a pulse width modulation wave generated by a specific switching mode composed of twelve power switching elements of a three-phase three-level power inverter, which can make the output current waveform as close as possible to the ideal sinusoidal waveform. The space voltage vector PWM is different from the traditional sinusoidal PWM. It starts from the overall effect of the three-phase output voltage and focuses on how to make the motor obtain an ideal circular flux trajectory. The technology of SVPWM space vector modula...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/483H02M1/44
CPCH02M1/44H02M7/483Y02E10/56
Inventor 李新富欧余斯吴龙生
Owner SOLAR POWER NETWORK TECHNOLOGY (ZHEJIANG) CO LTD