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Model predictive control method for reducing switching frequency of quasi-Z source inverter

A model predictive control and source inverter technology, applied in the direction of converting irreversible DC power input into AC power output, can solve problems such as shortening service life and reducing system efficiency

Active Publication Date: 2019-08-30
杭州领芯微电子有限公司
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Problems solved by technology

In high-power photovoltaic quasi-Z source inverters, the loss of IGBT (insulated gate bipolar transistor) cannot be ignored, which will not only reduce the efficiency of the entire system, but also shorten the service life of IGBT due to severe heat generation.

Method used

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  • Model predictive control method for reducing switching frequency of quasi-Z source inverter
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  • Model predictive control method for reducing switching frequency of quasi-Z source inverter

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Embodiment Construction

[0067] The present invention will be further described below in conjunction with the accompanying drawings.

[0068] refer to Figure 1-Figure 4 , a model predictive control method based on a quasi-Z source inverter to reduce the switching frequency, including the following steps:

[0069] Step 1, establish the model of the quasi-Z source inverter, the process is as follows:

[0070] 1.1, the voltage equation of the quasi-Z source inverter on the output side is

[0071]

[0072] In the formula, i out is the output current, V out is the output voltage, R and L are the load resistance and load inductance;

[0073] 1.2, the capacitance and voltage equations of the quasi-Z source inverter in the non-straight-through state and the straight-through state In the non-straight-through state:

[0074]

[0075] In the straight-through state:

[0076]

[0077] In the formula, v in is the supply voltage, v C1 is the capacitor voltage, R L1 is the stray resistance of the i...

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Abstract

The invention relates to a model predictive control method for reducing the switching frequency of a quasi-Z source inverter, which comprises the steps of establishing system models of the quasi-Z source inverter, including the establishment of system models in a non-through state and a through state; determining and selecting a voltage vector criterion, including a transitional zero vector, six traditional effective vectors and a through vector; designing a cost function; and introducing a switching frequency-related weight item into the cost function in order to reduce the switching frequency of the quasi-Z source inverter, wherein the switching frequency of the system can be reduced through adjusting a weighting factor of the switching frequency weight item. The reduction of the switching frequency of the system will bring the following two advantages: first, the loss of the system at the on-off switching time is reduced by reducing the switching frequency of the system so as to improve the working efficiency of the whole system; and second, the reduction of the switching frequency of the system also means that the service life of an IGBT is longer.

Description

technical field [0001] The invention relates to the control field of a quasi-Z source inverter, in particular to a model predictive control method for a quasi-Z source inverter with reduced switching frequency. Background technique [0002] Traditional voltage-type inverters are widely used in new energy power generation systems, but they do not have the function of step-up / down, and cannot adapt to large-scale fluctuations in input voltage. limitations. To realize the step-up / step-down function, an additional Buck / Boost circuit needs to be added to form a two-stage power conversion circuit, which has a complex structure and lower reliability. The application of Z-source inverter and quasi-Z-source inverter to the new energy power generation system can overcome the shortcomings of traditional inverters. When the load is heavy , the inverter works in boost mode; when the load is light, the inverter works in buck mode, which is similar to the working mode of traditional inve...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48
CPCH02M7/48
Inventor 吴春杨佳磊陈强
Owner 杭州领芯微电子有限公司
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