基于插值同步预处理的Hilbert无功功率测量  

Reactive power measurement by Hilbert transform based on interpolation synchronization preprocessing

作　　者：孙曙光[1] 于淼[1] 杜太行[1] 王景芹[2] 

机构地区：[1]河北工业大学控制科学与工程学院,天津300130 [2]河北工业大学电气工程学院,天津300130

出　　处：《电力系统保护与控制》2016年第17期97-103,共7页Power System Protection and Control

基　　金：天津市科技支撑重点项目(12ZCZDGX01400);河北省高等学校科学技术研究重点项目(ZD2014051);河北工业大学博士科研启动费资助项目

摘　　要：针对电网信号频率波动情况下,非同步采样造成频谱泄漏,引起无功功率计算误差的问题,提出一种基于数据预处理的Hilbert无功功率计算方法。即首先使用改进Rife算法实时估计电网中的频率,然后利用插值运算进行数据同步化,最后使用Hilbert变换得到准确的无功功率。在对信号频率测量基础上,对于插值算法,经仿真对比研究,Hermite插值算法达到了比较理想的数据同步化效果。继而对基于Hilbert的无功功率测量方法进行分析,并构建了电弧炉负载仿真模型,作为无功源。仿真结果表明,在电网信号频率波动以及含谐波的情况下,相对于常规的无功功率计算方法,基于插值同步预处理的Hilbert法明显提高了无功功率计算的精度。For the problem that asynchronous sampling causes spectral leakage and reactive power calculation error when the power signal frequency fluctuates, this paper proposes a reactive power calculation method by Hilbert transform based on data preprocessing. It is that firstly, the improved Rife algorithm is used to estimate the real-time frequency, and then the interpolation operation is used to synchronize data, finally the Hilbert transform is used to get the accurate reactive power. Based on the measuring of signal frequency, for interpolation method, the Hermite interpolation algorithm achieves the ideal data synchronization effect by simulation comparison. Then the reactive power measurement method based on Hilbert is analyzed and arc furnace load simulation model is built as a reactive power source. Simulation results show that when the power signal fluctuates and contains harmonics the calculation accuracy of reactive power is mostly improved by using Hilbert method based on interpolation synchronization compared to conventional reactive power calculation method.

关 键 词：频率估计 Rife算法 Hermite同步插值 无功功率 Hilbert算法 

分 类 号：TM744[电气工程—电力系统及自动化]