Power buffer design method based on model predictive control

A technology of model predictive control and design method, applied in simulators, general control systems, control/regulation systems, etc., can solve problems such as high model accuracy requirements, meet power quality requirements, and achieve energy optimal distribution.

Active Publication Date: 2019-05-10
NORTHWESTERN POLYTECHNICAL UNIV
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  • Abstract
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  • Application Information

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Problems solved by technology

However, the algorithm has high requirements for the accuracy of the model, especially the demand for load needs to be accurately observed

Method used

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  • Power buffer design method based on model predictive control
  • Power buffer design method based on model predictive control
  • Power buffer design method based on model predictive control

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Embodiment Construction

[0031]This embodiment is a method for designing a power buffer based on model predictive control.

[0032] The technical features involved in this embodiment described below may be combined as long as they do not constitute a conflict with each other.

[0033] See attached figure 1 , the topology of the power buffer converter refers to the attached figure 1 . where v sa , v sb , v sc Represents a three-phase power supply; R s is the equivalent line resistance of the AC side; L s is the AC side inductance; the switching tube Q 1 ~Q 6 A three-phase rectifier bridge is formed; C dc is the DC side capacitance; the switching tube T 1 , T 2 and inductance L b A DC / DC converter is formed; the energy storage element is a battery or a super capacitor; the latter stage is a constant power load and a motor load.

[0034] This embodiment is verified by MATLAB / Simulink simulation. The specific implementation steps are as follows:

[0035] Step 1. Build a simulation model in ...

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Abstract

The invention discloses a power buffer design method based on model predictive control. By utilizing a characteristic of multi-objective optimization of the model predictive control, a three-phase rectifier bridge and a DC/DC converter are controlled at the same time. A target optimization function is designed by adopting a finite set method; in combination with constraint conditions of differentenergy flow coupling, an overall control model is built; multi-objective optimization control can be realized by adopting the model predictive control method; and for a power supply system with an energy storage device, an active energy management mode is adopted, so that the energy optimization distribution of a more electric aircraft can be realized. Therefore, direct-current bus voltage is stable. The model performs buck-boost control on the bidirectional DC/DC converter according to the energy feedback condition of a motor, and direct-current bus power is stable through charging and discharging of a battery pack. The power topology of the power buffer converter is adopted; and the direct current bus power is compensated and absorbed through a storage battery, so that the weight of theaircraft can be effectively reduced.

Description

technical field [0001] The invention relates to a power buffer converter voltage stabilization and energy storage control method with an energy feedback motor and a constant power load in a multi-electric aircraft electrical system. Background technique [0002] In recent years, with the introduction of multi-electric and all-electric aircraft, distributed power distribution technology has been widely used in independent power systems such as multi-electric and all-electric aircraft in the future. According to some data, the constant power load can account for 80% of the total load in the high-voltage DC power distribution system of multi-electric and all-electric aircraft in the future. The proportion of constant power loads in the system is increasing, and the problems it brings are becoming more and more prominent. [0003] For a constant power load, although its instantaneous impedance is positive But its corresponding impedance increment is negative This characteri...

Claims

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Application Information

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Patent Type & Authority Applications(China)
IPC IPC(8): G05B17/02H02J7/34
Inventor 雷涛陈光巳刘晓飞张晓斌
Owner NORTHWESTERN POLYTECHNICAL UNIV
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