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Method for analyzing small signal stability of aircraft electric power system based on generalized state space averaging

A state-space averaging and power system technology, applied in the direction of electrical digital data processing, special data processing applications, instruments, etc., can solve problems such as stability damage and economic loss

Inactive Publication Date: 2015-08-05
CIVIL AVIATION UNIV OF CHINA
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  • Abstract
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  • Application Information

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Problems solved by technology

[0003] With the B787, A380 and other multi-electric aircrafts put into use, more and more attention has been paid to the safe and stable operation of the aircraft power system. Once its stability is damaged, it will cause huge economic losses and catastrophic consequences.

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  • Method for analyzing small signal stability of aircraft electric power system based on generalized state space averaging
  • Method for analyzing small signal stability of aircraft electric power system based on generalized state space averaging
  • Method for analyzing small signal stability of aircraft electric power system based on generalized state space averaging

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Embodiment

[0059] In this embodiment, based on a power system of a multi-electric aircraft, a generalized state-space average model is established and small-disturbance stability analysis is performed. figure 2 This is a schematic diagram of the power system structure of a multi-electric aircraft including specific links, assuming that the adjustment speed of the GCU is fast enough, so the alternator can be replaced by an AC 400Hz regulated AC power supply, and the electric actuation system can be replaced by a constant power load. The remaining components include: Transmission lines, transformer rectifiers, DC filter capacitors. R eq , L eq ,C eq Respectively, line and transformer equivalent resistance, reactance, capacitance.

[0060] 1) According to the simplified structure diagram of the multi-electric aircraft power system, convert the DC side circuit to the AC side, and get image 3 The single-line diagram of the AC-DC mixed power flow calculation of the aircraft power system ...

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Abstract

The invention relates to a method for analyzing small signal stability of an aircraft electric power system based on generalized state space averaging, comprising the steps as follows: establishing a power flow equation of the aircraft electric power system according to the structure of the aircraft electric power system, and determining the steady state working point of the aircraft electric power system; establishing an equivalent circuit for modeling the generalized state space averaging of the aircraft electric power system to obtain a nolinear differential equation of the aircraft electric power system; determining the state variable of the nolinear differential equation, and obtaining a generalized state space averaging model described by a fourier coefficient via Fourier decomposition; judging the small signal stability of the aircraft electric power system via calculating according to the model. The method of the invention realizes the analysis of small signal stability of the aircraft electric power system in different states, and realizes the sensitivity analysis of the small signal stability, which provides valuable suggestions for designing and improving the electric power system in large aircraft manufacturing process, and simultaneously provides reliable operation information of the aircraft electric power system for the flight crew.

Description

technical field [0001] The present invention relates to a small-disturbance stability analysis method for an aircraft power system, in particular to a small-disturbance stability analysis method for an aircraft power system based on generalized state space averaging. Through state matrix analysis using Fourier coefficients as state variables, the Realize accurate small-disturbance stability determination of aircraft power system. Background technique [0002] In order to save energy, reduce costs and improve the performance of airborne systems, modern aircraft increasingly use electric energy to replace hydraulic and pneumatic energy on traditional aircraft, that is, replace the mechanical, hydraulic and pneumatically driven loads directly driven by the engine with electric drives load. The concept of "More Electric Aircraft" thus proposed has become the mainstream trend in the development of the aircraft industry. With the development and maturity of more electric aircraf...

Claims

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Application Information

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IPC IPC(8): G06F17/50
Inventor 杨占刚赵宏旭荆涛徐萌石旭东
Owner CIVIL AVIATION UNIV OF CHINA
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