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Common-mode voltage satisfactory decision-based FCS-MPC (Finite Control Set Model Predictive Control) method

A common-mode voltage and decision-making technology, which is applied in the field of predictive control of multi-level converters, can solve problems such as reducing the amount of predictive calculations, achieve the effects of reducing system switching frequency, avoiding voltage jump restrictions, and reducing switching losses

Inactive Publication Date: 2017-05-24
XUZHOU NORMAL UNIVERSITY
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  • Application Information

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Problems solved by technology

But so far there is no FCS-MPC method applicable to multilevel converter topology, which can realize the maximum amplitude control of common-mode voltage, and does not need the corresponding common-mode voltage suppression weight coefficient setting problem, and can effectively reduce the calculation amount of prediction.

Method used

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  • Common-mode voltage satisfactory decision-based FCS-MPC (Finite Control Set Model Predictive Control) method
  • Common-mode voltage satisfactory decision-based FCS-MPC (Finite Control Set Model Predictive Control) method
  • Common-mode voltage satisfactory decision-based FCS-MPC (Finite Control Set Model Predictive Control) method

Examples

Experimental program
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Embodiment Construction

[0051] 1) detect t k Actual value at time, apply the optimal voltage vector s(k) selected by the predicted FCS-MPC in the previous cycle, and the optimal switching vector in the first cycle is the zero vector;

[0052] 2) Delay compensation, predict t under the action of s(k) k+1 current value i p (t k+1 );

[0053] 3) Voltage vector optimization selection based on the minimum switching loss in a single cycle, formula ②, formula ③

[0054] The maximum number of optional vectors is: 2*N+1, N is the number of inverter bridge arms, and the optimal voltage vector selected in the last cycle is s(k)=(s a (k)s b (k)s c (k)), then the voltage vector is one of the following situations:

[0055]

[0056] This method is applicable to any topology, as long as:

[0057]

[0058] 4) Inverter output common-mode voltage amplitude range control based on satisfactory decision-making, formula ④, set the satisfaction function of common-mode voltage suppression as:

[0059]

[00...

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Abstract

The invention relates to a common-mode voltage satisfactory decision-based FCS-MPC (Finite Control Set Model Predictive Control) method and belongs to the multi-level converter control field. According to the method of the invention, a switching loss angle is decreased, it is stipulated that only one phase or only one electric level order is converted at most in each control period, and predictive calculation quantity is reduced to 7 times at most and 4 times at least, and therefore, minimum switching loss control in a single control period can be realized; a satisfactory optimization control idea is introduced, a common-mode voltage satisfactory optimization decision is adopted to replace a traditional weight coefficient design setting link, and controller design is simplified; and selected effective voltage vectors are evaluated according to a FCS-MPC system value function, and an optimal voltage vector is selected to act in a next control period.

Description

technical field [0001] The invention relates to the technical field of predictive control of multi-level converters, in particular to a finite set model predictive control method suitable for inverter output common-mode voltage suppression. [0002] technical background [0003] The frequency conversion drive system using the voltage source inverter will generate a common-mode voltage between the neutral point of the motor and the power supply ground, which will lead to the existence of high-frequency common-mode current and induce unnecessary electromagnetic interference; at the same time, with the inverter As the number of levels increases, the amplitude of the common-mode voltage (CMV) increases accordingly. Excessively high common-mode voltage will also threaten the insulation of the motor, forming "electric corrosion" on the motor bearing, shortening the motor and Therefore, it is necessary to suppress the common mode voltage in the motor drive control system. [0004] ...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): H02M7/48H02M1/12
CPCH02M1/12H02M7/48H02M1/123
Inventor 王贵峰禹晓梅夏正龙朱呈祥胡福年邹宽胜吴玮闫俊荣李春杰李洪美金鑫尚睿赵强
Owner XUZHOU NORMAL UNIVERSITY
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