CAJ | 학술논문

基于求导运算的单相电压暂降特征量检测算法精度受采样频率影响。为此，利用相邻两个时刻的电压采样值构造方程，提出了一种二点检测算法。通过相应增广矩阵，分析了算法的唯一解、无穷解和无解条件。建立了算法Simulink仿真模型，并与传统求导检测法及αβ变换求导检测法进行了对比。仿真结果表明三种算法的检测时间相同，但二点检测算法避免了导数运算造成的误差，检测结果精度更高，且不受采样频率影响，可有效降低电压暂降检测装置对采样频率及运算速率的要求，适合应用于检测速度要求高、谐波含量低的场合。
기우구도운산적단상전압잠강특정량검측산법정도수채양빈솔영향。위차，이용상린량개시각적전압채양치구조방정，제출료일충이점검측산법。통과상응증엄구진，분석료산법적유일해、무궁해화무해조건。건립료산법Simulink방진모형，병여전통구도검측법급αβ변환구도검측법진행료대비。방진결과표명삼충산법적검측시간상동，단이점검측산법피면료도수운산조성적오차，검측결과정도경고，차불수채양빈솔영향，가유효강저전압잠강검측장치대채양빈솔급운산속솔적요구，괄합응용우검측속도요구고、해파함량저적장합。
The accuracy of algorithm to detect characteristic quantity for single-phase voltage sag based on deri-vation is affected by sampling rate.A new algorithm, which called two-points algorithm,was proposed based on a equation set constructed by two voltage sampled at the adjacent time.The unique solution condition, unbounded so-lution condition and no solution condition of algorithm were analyzed by utilizing augmented matrix.The comparison between the two-points algorithm, derivation algorithm and the αβderivation algorithm was presented by Simulink model.Simulation results show that the detection times are same for these three algorithms.However, the accuracy of proposed algorithm is better than the other two algorithms and not affected by sampling rate because two-points detection algorithm do not need to calculate derivation.The proposed algorithm reduces demand of sampling rate and operating rate for voltage sag detector.It is suitable for application in actual engineering with high detection speed requirement and low harmonic content.