An aircraft power supply characteristics frequency transient parameter calibration method

A technology of power supply and parameter calibration, which is applied in the field of electrical measurement, can solve problems such as unreliable calibration results and incomplete uncertainty evaluation process, and achieve accurate and reliable calibration results

CN112526430BActive Publication Date: 2022-08-09BEIJING CHANGCHENG INST OF METROLOGY & MEASUREMENT AVIATION IND CORP OF CHINA
0 Cites 0 Cited by

Patent Information

Authority / Receiving Office
CN · China
Patent Type
Patents(China)
Current Assignee / Owner
Publication Date
2022-08-09

Smart Images

  • Figure 1
    Figure 1
  • Figure 2
    Figure 2
  • Figure 3
    Figure 3
Patent Text Reader

Abstract

The invention discloses a method for calibrating frequency transient parameters of power supply characteristics of an aircraft power supply, and belongs to the technical field of electrical measurement. The invention evaluates the uncertainty evaluation introduced by the discrete Hilbert transform algorithm in the process of frequency transient parameter calibration. The transformation algorithm obtains the instantaneous frequency. Analyze the uncertainty introduced by the discrete Hilbert transform error caused by the endpoint effect caused by insufficient sampling rate when the frequency changes instantaneously. According to the principle of discrete Hilbert transform to obtain the instantaneous frequency, the relationship between the instantaneous frequency and the original signal and the Hilbert transform of the original signal is established. Based on the numerical simulation technology, the error introduced by the end effect is calculated under different sampling rates, and then the evaluation is carried out. Uncertainty, improve the uncertainty analysis of the calibration results of the frequency transient parameters of the aircraft power supply characteristic test system, making the calibration results more accurate and reliable.
Need to check novelty before this filing date? Find Prior Art

Description

technical field

[0001] The invention relates to a method for calibrating a characteristic frequency transient parameter of an aircraft power supply, and belongs to the technical field of electrical measurement. Background technique

[0002] At present, the power supply system of large military and civil aircraft at home and abroad generally adopts constant frequency AC or variable frequency AC power supply system. At the same time, the research focus of electrical parameter testing of aircraft power grid is also gradually shifted from steady-state parameters such as voltage, current, distortion and modulation. In the study of transient parameters, including frequency transient parameters. According to the regulations of relevant standards, the calibration of frequency transient parameters needs to collect the entire change process through the data acquisition system, and obtain the transient moment and transient frequency value through data analysis.

[0003] The mainstream...

Examples

Embodiment Construction

[0031] The following examples illustrate the present invention in detail.

[0032] like figure 1 As shown, this embodiment discloses a method for calibrating frequency transient parameters of aircraft power supply characteristics. The main source of uncertainty u of the frequency transient parameter calibration result is the "end point effect" caused by insufficient sampling rate at the sudden change of waveform. "Introduced errors.

[0033] Step 1. Determine the relationship between the transient frequency and the original signal and its Hilbert transform.

[0034] The original signal s(n) is simulated according to the characteristics of the frequency transient signal of the aircraft power supply, and the process is as follows. According to the highest acquisition rate of the high-precision data acquisition system used, set the sampling rate of this signal fs=10MS / s, the total number of sampling points is N=10M, and create two sine wave sequences s1 and s2, whose frequencie...