摘要
为了抑制电力信号时变性和衰减直流分量对同步相量测量精度的影响,通过增加数据窗个数来获取信号时域信息的算法可以达到精确测量的目的,但时延较长,无法满足IEEE标准对保护类同步相量测量单元(phasor measurement unit,PMU)在动态响应速度方面的要求。鉴于此,参照前期利用信号时域信息的相量测量研究工作,该文提出利用电力信号频域信息滤除衰减直流的同步相量测量算法。通过拓展泰勒模型,建立含有衰减直流分量的动态信号模型,然后充分利用信号频域信息,在同一数据窗中获得多个不同频点处的相量值,进而计算得到表示基波时变性和衰减直流分量的模型参数,最后通过相移得到报告时刻的动态相量测量值。分别利用理想信号以及PSCAD/EMTDC信号对所提出算法进行验证,结果表明,所提算法虽然增加了一定的运算量,但在消除或减弱基波时变性和衰减直流分量影响的过程中,具有测量精度高、动态响应速度快、算法延时短等优点,能够满足IEEE标准对保护类PMU的测量要求。
While trying to decrease the impacts of both the fundamental time-variation and the decaying DC component on phasor estimation, the algorithm based on time-domain information requires several data windows to get the phasor estimation, which leads to a long latency and can hardly satisfy the IEEE standard on dynamic response speed of P-class phasor measurement unit（PMU）. Thus, this proposed approach only used frequency-domain information to decrease these two impacts. The Taylor model was adopted to express the characteristics of time-variation and decaying DC component; and several phasor estimations at different frequency bins were obtained with one data window by using the frequency-domain information; and then these phasor estimations were employed to estimate the model parameters of time-variation and decaying DC component; and finally the reported phasor estimation was attained by phase-shift operation. Tests on ideal signals and PSCAD/EMTDC generated signals show that, with limited increase of computational cost, the proposed algorithm can alleviate the influence of dynamic signals and decaying DC component on phasor estimation, and has advantages of high precision, fast dynamic response speed and short latency, which can meet the requirements of IEEE standard on PMU.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2016年第18期4923-4929,5116,共7页
Proceedings of the CSEE
基金
国家自然科学青年基金项目(51307146
51407150)~~
关键词
衰减直流分量
动态相量测量
频域信息
泰勒模型
响应速度
decaying DC component
dynamic phasor estimation
frequency domain information
Taylor model
dynamic response speed
