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A method for stabilizing low-voltage DC constant power loads dedicated to aviation

A constant power load, low-voltage DC technology, applied in the field of DC power converter systems, can solve problems such as reducing the system damping ratio and increasing the risk of system instability, and achieve the effects of improving reliability, light weight, and small size

Active Publication Date: 2018-08-24
NANJING GONGCHENG RES INST OF ENERGY CONSERVATION & NEW MATERIALS TECH CO LTD
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  • Abstract
  • Description
  • Claims
  • 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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  • A method for stabilizing low-voltage DC constant power loads dedicated to aviation
  • A method for stabilizing low-voltage DC constant power loads dedicated to aviation
  • A method for stabilizing low-voltage DC constant power loads dedicated to 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 pi...

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Abstract

The invention relates to a method for stabilizing an aviation-specific low-voltage direct current constant power load, which takes the aviation low-voltage direct current constant power load as the control object, adopts a double closed-loop control structure, and collects the capacitor energy of the rear stage (outer loop) and the inductor current of the front stage (inner loop) ), designed a method based on the direct injection of the high-frequency components of the filter inductor current into the duty cycle, so that under the same constant power load conditions, the system can be stabilized by using capacitors with smaller volume and weight, which can well meet the For the requirements of light weight and small volume of aerospace systems. The invention improves the stability of the system under constant power load and suppresses the vibration of the system. Significantly reducing the capacitance of the LC filter satisfies the requirements of light weight and small size of the aerospace system, increases the endurance of the aircraft and reduces the consumption of aviation fuel by the aircraft. It has strong 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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Patent Type & Authority Patents(China)
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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