CAJ | 학술논문

基于信号泰勒模型的动态相量测量算法，若仅利用信号频域信息求解模型参数则算法时延短、运算量大，若仅利用信号时域信息求解则算法运算量小、时延长。为更好满足实际应用对时延和运算量的综合需求，提出同时利用时域信息和频域信息的动态同步相量测量算法。在动态相量泰勒模型的基础上，通过傅里叶变换分别求取不同数据窗及不同频率点的相量测量值，再结合测量值的时域和频域信息，分析相量模型的动态特性，最后根据动态特性进行相移运算得到报告时刻的动态相量测量值。对理想信号及 PSCAD/ EMTDC仿真信号的相量测量结果表明，该算法在低频振荡、频率偏移等动态条件下，能有效降低信号动态特性对测量精度的影响。同时，该算法能对时延和运算量进行优化选择和平衡以满足实际应用的需求。
기우신호태륵모형적동태상량측량산법，약부이용신호빈역신식구해모형삼수칙산법시연단、운산량대，약부이용신호시역신식구해칙산법운산량소、시연장。위경호만족실제응용대시연화운산량적종합수구，제출동시이용시역신식화빈역신식적동태동보상량측량산법。재동태상량태륵모형적기출상，통과부리협변환분별구취불동수거창급불동빈솔점적상량측량치，재결합측량치적시역화빈역신식，분석상량모형적동태특성，최후근거동태특성진행상이운산득도보고시각적동태상량측량치。대이상신호급 PSCAD/ EMTDC방진신호적상량측량결과표명，해산법재저빈진탕、빈솔편이등동태조건하，능유효강저신호동태특성대측량정도적영향。동시，해산법능대시연화운산량진행우화선택화평형이만족실제응용적수구。
The dynamic phasor estimation algorithm based on the frequency-domain information obtains short delay but heavy computational burden, while that based on the time-domain information obtains light computational burden with long delay. The algorithm for dynamic phasor estimation based on the time-frequency information was proposed to balance the tradeoff of time delay and computational burden. Firstly, the Discrete Fourier Transform (DFT) based phasor estimations from different data windows and at different frequency bins were calculated with Taylor-series phasor model. Then, the time-frequency information of the DFT based phasor estimations were analyzed in detail, and modified phasor estimation was provided. Finally, phasor estimation at the report time was obtained by phase shift operation. Test results of both ideal signals and PSCAD/EMTDC generated signals shows that the proposed algorithm can provide accurate phasor estimations under conditions of power oscillations and frequency deviations. The time delay and the computational burden can be optimized by selecting the number of data window and frequency bin to meet the requirement of practical application.