A Harmonics Signal Extraction Method Based onImproved mSDFT Algorithm
LI Yan1,LIN Xiaoming2,3,ZHAO Yuming1,ZHANG Fan2,3,HE Shan1,QIAN Bin2,3
1. Shenzhen Power Supply Bureau Co. Ltd, Shenzhen, Guangdong 518001, China
2. Electric Power Research Institute, CSG, Guangzhou, Guangdong 510670, China
3. Guangdong Provincial Key Laboratory of Intelligent Measurement and Advanced Metering of Power Grid, Guangzhou, Guangdong 510670,China
Abstract：An improved mSDFT algorithm is proposed. For the improved algorithm, the structure of the comb filter contained in the transfer function generated from the traditional mSDFT algorithm is decomposed. That means retaining the specific zero points in the comb filter whose effect is to extract the specified harmonic in the power grid signal and making rest of zero points form a separate factor whose effect is amplitude correction and phase correction. The number of zeros contained in the comb filter is decreased by decomposing the structure of the comb filter, therefore, the delay time of the transient response is reduced. Besides, the principle of improved mSDFT algorithm is expounded and the formula derivation is completed. The results of simulation show that the improved algorithm can quickly track and extract the changed harmonic when the harmonic signal changes suddenly which indicates that it reduces the transient response delay of the traditional mSDFT algorithm, and has the advantages of no cumulative error and stability.
ZHONG Q, CHEN F Q, WANG G, et al. Site Test and Analysis of Harmonic Emission Characteristics of DC Chargers for Electric Vehicles ［J］. Electrical Measurement & Instrumentation, 2022, 43(5): 118-122, 131.
ZHA P C, GAN Y L, GAO H Y, et al. Quality assessment of electric vehicle charging stations accessing distribution network ［J］. Electrical Measurement & Instrumentation, 2022, 59(6): 69-75.
［3］
CHANG G W, CHEN C I, TENG Y F. Radial Basis Function Based Neural Network for Harmonic Detection ［J］. IEEE Transactions on Industrial Electronics, 2010, 57(6): 2171-2179.
ZHU S W, TIAN M X, LI J. Research on evaluation indexes of harmonic and unbalance pollution level in power system ［J］. Electrical Measurement & Instrumentation, 2020, 57(6): 23-29.
XU X T, JIA Z S, WANG L, et al. Research on Harmonic Voltage Measurement Method Based on Josephson Quantum Voltage ［J］. Acta Metrologica Sinica, 2020, 41(3): 311-316.
DOU J W, YANG X Y, YANG X Z. A Power System Harmonic Detection Method Based on Fractional Wavelet Transform. ［J］. Proceedings of The CSEE, 2024, 44(3): 872-880.
KANG P, GUO W, HUANG W G, et al. Review of the power quality problem and key treatment technology of regional power grid ［J］. Electrical Measurement & Instrumentation, 2020, 57(24): 1-12.
ZHUANG S Y, ZHAO W, ZHAO D F, et al. A Supraharmonics Dynamic Analysis Method Based on Sliding-window TLS-ESPRIT Algorithm［J］. Acta Metrologica Sinica, 2020, 41(4): 475-483.
YUAN L F, ZHANG C L, YIN B Q, et al. Accurate and Fast Feature Extraction Method of Power Quality Disturbances Based on Modified S-Transform of Optimal Bohman Window［J］. Journal of Electronics & Information Technology, 2022, 44(11): 3796-3805.
WEN X Y, WANG Z, ZHANG W K, et al. Harmonic extraction method based on dual observer ［J］. Control and Decision, 2022, 37(7): 1847-1852.
WANG X Q, YANG J F. APF Selective Harmonic Compensation Method Based on Improved SDFT and Predictive Control ［J］. Power Electronics, 2020,54(9): 15-18, 70.
［19］
CHEN D D, LIN Y Q, XIAO L, et al. A harmonics detection method based on improved comb filter of sliding discrete Fourier for grid-tied inverter ［J］. Energy Reports, 2020, 6: 1303-1311.
［21］
Carugati I, Orallo C M, Donato P G, et al. Three-Phase Harmonic and Sequence Components Measurement Method Based on mSDFT and Variable Sampling Period Technique ［J］. IEEE Transactions on Instrumentation and Measurement, 2016, 65(8): 1761-1772.
WANG Y, TANG W C, ZHAO J S, et al. Harmonic Pollution Partition Method Based on kDBA++ Clustering Algorithm ［J］. Advanced Engineering Sciences, 2023, 55(2): 84-96.
LI W F, ZHANG G G, ZHONG H J, et al. A High Frequency Resolution Harmonic and Interharmonic Analysis Model ［J］. Transactions of China Electrotechnical Society, 2022, 37(13): 3372-3379, 3403.
WANG Z, WEN X Y. Reduced-order Harmonic Extraction Method Based on Parameter Separation ［J］. Control Engineering of China, 2022, 29(11): 2152-2160.
ZHAI X H, DING X Y, YAO R Y, et al. Prediction and compensation of harmonic current in parallel side of unified power quality controller based on radial basis neural network ［J］. Electrical Measurement & Instrumentation, 2021, 58(8): 139-145.
MA C, WANG Y. Accurate Power System Frequency Algorithm based on DFT ［J］. Instrumentation Analysis Monitoring, 2016, 128(4): 18-21.
［20］
LYONS R G. Streamlining Digital Signal Processing: A Tricks of the Trade Guidebook［M］. Second Edition, New Jersey: IEEE Press, 2012, 207-214.
2024, Vol. 45 
