Low-voltage direct-current constant-power load stabilization method dedicated for aviation

A constant power load, low-voltage DC technology, applied in the field of DC power converter systems, can solve the problems of increasing the risk of system instability, reducing the system damping ratio, etc., to achieve the effects of light weight, improved reliability, and reduced cost

Active Publication Date: 2016-03-30
NANJING GONGCHENG RES INST OF ENERGY CONSERVATION & NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
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  • Application Information

AI Technical Summary

Problems solved by technology

However, when cascaded with constant power loads with negative damping characteristics, reducing the filter capacitor will reduce the damping ratio of the system and significantly increase the risk of system instability

Method used

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  • Low-voltage direct-current constant-power load stabilization method dedicated for aviation
  • Low-voltage direct-current constant-power load stabilization method dedicated for aviation
  • Low-voltage direct-current constant-power load stabilization method dedicated for aviation

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Embodiment Construction

[0027] Now in conjunction with embodiment, accompanying drawing, the present invention will be further described:

[0028] This embodiment will take the Boost converter as an example, according to the specific method and steps of the present invention, and on the basis of real data, the specific content of this new stabilization method for aviation-specific low-voltage DC constant power load system is given. And the feasibility and effectiveness of this method are proved by theoretical analysis and simulation experiment results.

[0029] 1. System Modeling

[0030] First, in order to analyze the stability and dynamics of the system, it is necessary to mathematically model the topology and control algorithms. The state variables of the system can be expressed as i f ,v f ,i L ,v o ,S i ,S v and f 1 . S i ,S v Integral variables representing the inner and outer loop errors, respectively, f 1 Represents the state variable of the high-pass filter, .K pex K iex K pin ...

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Abstract

The invention relates to a low-voltage direct-current constant-power load stabilization method dedicated for aviation. The low-voltage direct-current constant-power load of the aviation is taken as a control object, a double-closed-loop control structure is adopted, backward-stage capacitance energy (outer ring) and forward-stage inductance current (inner ring) are collected to design a method for directly injecting a duty cycle on the basis of the high-frequency component of filter inductance current, a capacitor with small voltage and weight can be used to make a system stable under the same constant-power load condition, and the requirements of light weight and small volume of an aerospace system can be favorably met. The low-voltage direct-current constant-power load stabilization method improves a stable situation of the system during constant-power load and inhibits system vibration. LC filter capacitance is obviously reduced, the requirements of light weight and small volume of the aerospace system can be met, the cruising ability of an airplane is improved, and the consumption of aviation fuel is lightened. The low-voltage direct-current constant-power load stabilization method is high in practical value.

Description

technical field [0001] The invention belongs to a DC power converter system, and relates to a method for stabilizing a low-voltage DC constant power load dedicated to aviation. Background technique [0002] In the field of aerospace, as more and more hydraulic or pneumatic transmissions are replaced by electric ones, all-electric aircrafts are gradually developed from more electric aircrafts. The power system will occupy a dominant position in future aircraft. Aircraft have very strict requirements on the size and weight of aviation products. Reducing the load of the power system can not only increase the endurance of the aircraft, but also reduce the consumption of aviation fuel by the aircraft. These have direct practical value for energy saving and emission reduction, cost reduction, and improvement of system stability. [0003] In the modern aircraft DC power supply system, both the closed-loop controlled motor load and the converter load can be regarded as constant po...

Claims

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Application Information

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IPC IPC(8): H02M3/156
CPCH02M3/156H02M1/0029
Inventor 庞圣钊皇甫宜耿郭亮
Owner NANJING GONGCHENG RES INST OF ENERGY CONSERVATION & NEW MATERIALS TECH CO LTD
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