CAJ | 학술논문

介绍了应用于智能电网速动保护的馈线终端高精度测频算法的具体设计。首先,灵活改进了传统的傅里叶算法,以角长度0.2π为基准,计算基波信号1/10的相角差,同时,提出了迭代运算方法与均值最小化误差算法,设置在硬件上很容易实现的较低的固定采样频率4 kHz,不受同步采样限制。无论是含有大量谐波及电网白噪声干扰的稳态电力信号,还是暂态电力信号,在频率、幅值突变情况下,与目前多种测频算法进行仿真比较,仿真与实验的结果证明,该算法精度高,计算量不大,在跟踪时间和超调误差方面具有明显的优越性,完全适合于智能电网配电自动化测控装置的实际应用。
개소료응용우지능전망속동보호적궤선종단고정도측빈산법적구체설계。수선,령활개진료전통적부리협산법,이각장도0.2π위기준,계산기파신호1/10적상각차,동시,제출료질대운산방법여균치최소화오차산법,설치재경건상흔용역실현적교저적고정채양빈솔4 kHz,불수동보채양한제。무론시함유대량해파급전망백조성간우적은태전력신호,환시잠태전력신호,재빈솔、폭치돌변정황하,여목전다충측빈산법진행방진비교,방진여실험적결과증명,해산법정도고,계산량불대,재근종시간화초조오차방면구유명현적우월성,완전괄합우지능전망배전자동화측공장치적실제응용。
This paper introduces detailed design of a high accurate frequency-measuring algorithm for smart grid feeder terminal units.The algorithm can be used for protection purpose.Firstly,the traditional Fourier algorithm is improved to improve its flexibility,and the 1/10 time phase difference of fundamental wave base on the phase length of 0.2πis calculated.At the same time,using the mean error minimization algorithm and iteration method,a lower fixed sampling frequency of 4 kHz can be set. It can be completed easily on hardware and is not limited by synchronous sampling.Whether the steady power signals include a large number of harmonics and white noise or the transient power signals,in the case of frequency and amplitude changing,the proposed method is compared with current frequency-measuring algorithms,the results of simulation and experimentation show that the algorithm is accurate and does not have a big computation,and has an obvious advantage in the case of tracking time and overshoot error,fitting for actual application of measurement and control device for smart grid distribution automation perfectly.