Abstract：A real-time frequency estimation algorithm based on 3-line discrete Fourier transform (DFT) is presented in this article for variable frequency measurement in aircraft power system. The signal is firstly weighed by means of Hanning window, and the spectrum amplitude in main lobe area is calculated via DFT. The numerical value relation between fundamental frequency and 3-spectrum amplitude is then derived. According to the features of power system, the number of samples in the algorithm is determined, which has no main lobe spectrum leakage. The spectrum amplitude is extracted in rotating reference frame to effectively reduce the computation effort. Iterative calculation of initial frequency is introduced to perform continuously long-range frequency estimation with no fence effect. Simulation and experimental results show that the proposed technique can simultaneously track the frequency with fast step response and high steady-state accuracy.
肖鲲, 王莉娜, M.KhurramShahzad. 基于三线DFT的航空电源频率实时检测算法[J]. 电工技术学报, 2012, 27(10): 190-195.
Xiao Kun, Wang Lina, M. Khurram Shahzad. Real-Time Frequency Estimation of Aircraft Power Source Based on 3-Line DFT. Transactions of China Electrotechnical Society, 2012, 27(10): 190-195.
[1] Rosero J A, Ortega J A, Aldabas E, et al. Moving towards a more electric aircraft[J]. IEEE Aerospace and Electronic Systems Magzine, 2007, 22(3): 3-9. [2] Saleh S A, Rahman M A. Analysis and real-time testing of a controlled single-phase wavelet- modulated inverter for capacitor-run induction motors[J]. IEEE Transactions on Energy Conversion, 2009, 24(1): 21-29. [3] Andreotti A, Bracale A, Caramia P, et al. Adaptive prony method for the calculation of power-quality indices in the presence of nonstationary disturbance waveforms[J]. IEEE Transactions on Power Delivery, 2009, 24(2): 874-883. [4] 丁屹峰, 程浩忠, 吕干云, 等. 基于Prony算法的谐波和间谐波频谱估计[J]. 电工技术学报, 2005, 20(10): 94-97. Ding Yifeng, Cheng Haozhong, Lu Ganyun, et al. Spectrum estimation of harmonics and interharmonics based on prony algorithm[J]. Transactions of China Electrotechnical Society, 2005, 20(10): 94-97. [5] Routray A, Pradhan A K, Rao K P. A novel kalman filter for frequency estimation of distorted signals in power systems[J]. IEEE Transactions on Instrumentation and Measurement, 2002, 51(3): 469-479. [6] Arruda N, Filho B J C, Silva S M, et al. Wide bandwidth single and three-phase PLL structures for grid-tied PV systems[C]. 28th IEEE Photovoltaic Specialist Conference, 2000: 1660-1663. [7] 龚锦霞, 解大, 张延迟. 三相数字锁相环的原理及性能[J]. 电工技术学报, 2009, 24(10): 94-99. Gong Jinxia, Xie Da, Zhang Yanchi. Principle and performance of the three-phase digital phase-locked loop[J]. Transactions of China Electrotechnical Society, 2009, 24(10): 94-99. [8] McGrath B P, Holmes D G, Galloway J J H. Power converter line synchronization using a discrete fourier transform (DFT) based on a variable sample rate[J]. IEEE Transactions on Power Electronics, 2005, 20(4): 877-884. [9] Thomas D W P, Woolfson M S. Evaluation of frequency tracking methods[J]. IEEE Transactions on Power Delivery, 2001, 16(3): 367-371. [10] Kia S H, Henao H, Capolino G A. A high-resolution frequency estimation method for three-phase induction machine fault detection[J]. IEEE Transactions on Industrial Electronics, 2007, 54(4): 2305-2314. [11] Mojiri M, Ghartemani M K, Bakhshai A. Estimation of power system frequency using an adaptive notch filter[J]. IEEE Transactions on Instrumentation and Measurement, 2007, 56(6): 2470-2477. [12] Andria G, Dell’Aquila A, Salvatore L. Analysis of distorted unbalanced waveforms in inverter drives[J]. IEEE Transactions on Power Electronics, 1989, 4(2): 298-310.
2012, Vol. 27 
