摘要
基于时变动态相量理论,通过研究电流波动特性对系统侧谐波阻抗估计值的影响,发现了公共连接点(PCC)处谐波电压与谐波电流波动量之间存在的非线性关系,说明在某些情况下采用波动量法估计系统侧谐波阻抗可能存在较大误差。为此,文中进一步提出了估计系统侧谐波阻抗幅值的最小二乘拟合算法。最后,采用PSCAD仿真工具,通过蒙特卡洛仿真分析,验证了所提出算法的准确性和适用性。
Based on the theory of time-varying dynamic phasors,this paper finds that the current＇s fluctuation characteristic has an effect on the assessment accuracy of power system harmonic impedance using the fluctuation method,and that the relationship between the system harmonic impedance,harmonic voltage and harmonic current is non-linear at the common coupling point.In some cases,the assessment error of the system harmonic impedance based on the fluctuation method may be significant.Therefore,this paper proposes a least squares fitting algorithm to assess the magnitude of system harmonic impedance.Typical Monte Carlo simulations are carried out on PSCAD.Results show that the proposed method is valid and more suitable for engineering application.
出处
《电力系统自动化》
EI
CSCD
北大核心
2012年第3期65-70,共6页
Automation of Electric Power Systems
关键词
电能质量
波动量法
谐波阻抗
时变动态相量
power quality
fluctuation method
harmonic impedance
time-varying dynamic phasors
