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A finite control set model predictive control method considering switching frequency optimization

A technology of model predictive control and finite control set, which is applied in the direction of control system, AC motor control, output power conversion device, etc., can solve the problems such as the difficulty of output filter design, and achieve the effect of superior dynamic performance

Active Publication Date: 2022-07-05
NANTONG UNIVERSITY
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Problems solved by technology

However, the traditional finite control set model predictive control only selects one voltage vector for a single control period, and the switching frequency of the system changes with the working conditions such as load and speed, which brings great difficulties to the design of the output filter.

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  • A finite control set model predictive control method considering switching frequency optimization
  • A finite control set model predictive control method considering switching frequency optimization
  • A finite control set model predictive control method considering switching frequency optimization

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Embodiment Construction

[0028] The present invention will be described in further detail below with reference to the accompanying drawings and examples. The following embodiments are to explain the present invention and the present invention is not limited to the following embodiments.

[0029] by figure 1 The shown three-phase two-level inverter is used as a control object of a finite control set model predictive control method considering switching frequency optimization, and the control block diagram is as follows: figure 2 shown, including the following steps:

[0030] Step 1: In each sampling period, detect the system state variable x k , and use the integrator 1 to obtain the number of continuous cycles Q of the control signal k , that is, the number of sampling periods that the control signal "0" or "1" lasts. The number of continuous cycles of the control signal Q k Specifically:

[0031] Q k =[Q u,a,k ,Q u,b,k ,Q u,c,k ,Q d,a,k ,Q d,b,k ,Q d,c,k ] T (1)

[0032] In the formul...

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Abstract

The invention discloses a finite control set model predictive control method considering switching frequency optimization. First, the system state variable is detected, and the integrator is used to obtain the number of continuous cycles of the control signal; secondly, the system state prediction model and the prediction model of the number of continuous cycles of the control signal are used to predict the future state of the system and the number of continuous cycles of the control signal; Combined with the cost function of the control signal constraint term, the voltage vector of the converter is evaluated, and the voltage vector that minimizes the cost function is selected as the optimal voltage vector and acts on the converter. The invention discloses a finite control set model predictive control algorithm considering switching frequency optimization to control the switching frequency of the system by predicting and constraining the number of continuous cycles of the control signal, aiming to overcome the existence of traditional finite control set model predictive control algorithms. The switching frequency is not fixed defect.

Description

technical field [0001] The invention relates to a finite control set model predictive control algorithm considering switching frequency optimization, and belongs to the field of motor control. Background technique [0002] With the development of power electronic technology and high-performance microprocessors, high-performance control algorithms have received extensive attention from scholars. Model predictive control has the advantages of simple control idea, fast dynamic response, and easy realization of multi-objective control. It has become a research hotspot at home and abroad. As an important branch of model predictive control, finite control set model predictive control fits the discrete characteristics of power electronic converters, and has been widely used in the fields of motor drives and power converters. However, the traditional finite control set model predictive control single control cycle only selects a voltage vector, and the switching frequency of the sy...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02P27/06H02M7/483H02M7/5387
CPCH02P27/06H02M7/483H02M7/53875Y02B70/10
Inventor 於锋刘兴葛天天
Owner NANTONG UNIVERSITY
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