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A Model Predictive Control Method for Quasi-z Source Inverter without Weight Coefficient

A model predictive control, source inverter technology, applied in output power conversion devices, AC power input conversion to DC power output, electrical components, etc. The inverter can not work properly and other problems, to achieve the effect of eliminating the weight coefficient, reducing the amount of calculation, and the control method is simple

Active Publication Date: 2021-12-17
ZHEJIANG UNIV OF TECH
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Problems solved by technology

Although the above method can achieve good control of the aligned Z-source inverter, there are three weight coefficients in the cost function that need to be adjusted at the same time, and there is currently no suitable design rule to guide the design of the weight coefficients, so when a cost function has multiple When the weight coefficient is used, the adjustment of the weight coefficient will become extremely cumbersome. If the weight coefficient is not designed properly, it will cause the quasi-Z source inverter to fail to work normally. In addition, this method also has the disadvantage of a large amount of calculation, which gives Digital processors bring some computational pressure

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  • A Model Predictive Control Method for Quasi-z Source Inverter without Weight Coefficient
  • A Model Predictive Control Method for Quasi-z Source Inverter without Weight Coefficient
  • A Model Predictive Control Method for Quasi-z Source Inverter without Weight Coefficient

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Embodiment Construction

[0076] The present invention will be further described below in conjunction with the accompanying drawings.

[0077] refer to Figure 1-Figure 8 , a model predictive control method for a quasi-Z source inverter without weight coefficients, comprising the following steps:

[0078] Step 1. Sampling the voltage signal and current signal of the Z-source inverter;

[0079] Note that the current is the kth sampling moment, and the voltage signal and current signal of the Z source inverter are sampled. The sampling content includes: inductor current i L1 (k) and capacitor voltage v C1 (k) and output load three-phase current i a (k), i b (k) and i c (k), and then transform the load three-phase current from the three-phase static coordinate system to the αβ coordinate system to obtain i oα (k) and i oβ (k);

[0080] Step 2, establishing the mathematical model of the quasi-Z source inverter, the process is as follows:

[0081] 2.1, Establish the output voltage equation of the A...

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Abstract

A quasi-Z source inverter model predictive control method without weight coefficients, which collects voltage and current signals for the quasi-Z source inverter; establishes a mathematical model of the quasi-Z source inverter; thereby establishes a quasi-Z source inverter The prediction model of each control object of the inverter is added, and the delay compensation strategy is added; the reference value of each control object is calculated; according to the cascade model prediction control method and the particularity of the inductor current, the quasi-Z source inverter is determined. Controls the priority of the object. The invention adopts the cascade model predictive control method, and compared with the traditional finite set model predictive control method, the weight coefficient is effectively eliminated, the control method is simpler, and the calculation amount of the digital processor is reduced.

Description

technical field [0001] The invention discloses a model predictive control method of a quasi-Z source inverter without a weight coefficient, and belongs to the control field of the quasi-Z source inverter. Background technique [0002] As a new type of inverter topology, quasi-Z-source inverter (qZSI) can overcome the shortcomings of traditional inverters and has its own boost function, which is very suitable for new energy power generation occasions such as photovoltaics. At present, the research on the control method of the Z-source inverter is mainly divided into two categories, one is the traditional modulation method, mainly sinusoidal pulse width modulation (sinusoidal pulse width modulation, SPWM) method and space vector modulation (space vector PWM, SVPWM) method; the other is a nonlinear control method based on model predictive control. Compared with the traditional modulation method, the model predictive control method has the characteristics of no modulation, simp...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02M7/5387
CPCH02M7/53873
Inventor 吴春杨佳磊陈强
Owner ZHEJIANG UNIV OF TECH
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