摘要
由于电力电子技术的发展,非线性负荷在电网中所占的比重越来越大。非线性负荷在电力系统中容易产生谐波,造成谐波污染,因此有必要对其特性做出分析。提出了一种基于高阶微分方程和信号拟合,通过实时求取非线性负荷的等值阻抗来获取非线性负荷特性的方法。利用改进的矩阵束方法拟合端口电压电流信号,将电压电流信号代入到约束端口电压电流的高阶微分方程中,通过数学变换,得到负荷的等值电抗参数。依据负荷的等值参数的变化特点,来获取非线性负荷的特性。仿真实验表明该方法可行,可实时有效地求取负荷的等值阻抗参数,进而可获取非线性负荷特性。
With the development of power electronics technology, the proportion of nonlinear load in the power grid is increasing. It is easy for nonlinear load in the power system to produce harmonics which result in harmonic pollution, therefore, it is necessary to make an analysis for its characteristics. In this paper, a method to obtain the nonlinear load characteristic by obtaining the real-time equivalent impedance of the nonlinear load based on the high order differential equation and the signal fitting is proposed. With using improved matrix beam method to fit the port voltage and current signal and putting voltage and current signal into the high-order differential equation which is to constrain port voltage and current, the equivalent reactance parameters of the load can be obtained through mathematical transformation. The characteristics of the nonlinear load are obtained according to the change characteristics of the equivalent parameters of the load. Simulation results show that the method is feasible and the equivalent impedance parameters of the load can be obtained in real time so that the nonlinear load characteristics can be obtained.
出处
《重庆大学学报（自然科学版）》
EI
CAS
CSCD
北大核心
2017年第11期47-55,共9页
Journal of Chongqing University
关键词
非线性负荷
谐波污染
信号拟合
参数辨识
nonlinear load
harmonic pollution
signal fit
parameter identification
