CAJ | 학술논문

为适应智能变电站全数字化保护系统对相量提取算法的新要求，针对短窗算法滤波性能差而傅里叶算法延时较长且数据窗固定的不足，提出了一种窄带滤波器与变长数据窗相结合的相量提取算法。首先采用窄带滤波器对采样值序列进行带通滤波，并由短窗算法估算滤波器初值，以减小窄带滤波器暂态过程影响，缩短滤波器延时。然后对滤波器输出序列采用基于最小二乘法的变数据窗算法，最终准确提取相量特征。算法充分考虑了智能变电站的特点，实现了可变数据窗的相量提取，在保证滤波精度的同时提高了相量提取速度。数字仿真和动模数据验证表明，该算法可在发生故障后较短时间内准确提取出基波相量，有效提高了智能变电站全数字化保护的速动性和适应性。
위괄응지능변전참전수자화보호계통대상량제취산법적신요구，침대단창산법려파성능차이부리협산법연시교장차수거창고정적불족，제출료일충착대려파기여변장수거창상결합적상량제취산법。수선채용착대려파기대채양치서렬진행대통려파，병유단창산법고산려파기초치，이감소착대려파기잠태과정영향，축단려파기연시。연후대려파기수출서렬채용기우최소이승법적변수거창산법，최종준학제취상량특정。산법충분고필료지능변전참적특점，실현료가변수거창적상량제취，재보증려파정도적동시제고료상량제취속도。수자방진화동모수거험증표명，해산법가재발생고장후교단시간내준학제취출기파상량，유효제고료지능변전참전수자화보호적속동성화괄응성。
In order to meet smart substation new demands on phasor extraction algorithm for completely digital relays in face of the poor filtering performance of the short-window algorithm and Fourier algorithm”s long time-delay and fixed data-window,a phasor extracting algorithm with narrow band-pass digital filter (NBDF) and variable data-window combined is proposed. Primarily,the NBDF filters the original sequence of sampled values,with the initial values of NBDF estimated by the short-window algorithm to reduce the impact of NBDF”s transient process and shorten the filter”s time-delay.Then the variable data-window algorithm based on least squares method is applied to the output sequence of NBDF.As a result,the phasor magnitude and phase are acquired.The new algorithm that takes into full account the characteristics of the smart substation mentioned above realizes the phasor extraction of variable data-window,increasing the phasor extracting speed while ensuring filtering precision.Digital simulation and verification by record data show that the proposed algorithm is capable of accurately extracting the fundamental phasor,improving the rapidity and adaptability of completely digital relays in smart substations.