摘要
投切电容器是计算电网谐波阻抗特性的常用操作方法,充分利用分组投切电容器的各组数据,可以更准确地计算电网谐波阻抗特性。为此,采用Prony算法滤除电压、电流响应中的稳态分量,得到其暂态分量。对电压、电流暂态分量进行离散Fourier变换,得到投切各组电容器时的电网谐波阻抗特性。各组电网谐波阻抗特性按照暂态时域能量大小进行权重分配,再利用3次样条插值对各离散频率处的阻抗进行拟合,构成最终的电网谐波阻抗特性。仿真结果表明,对于基于分组投切电容器的各组数据、采用时域能量权重系数法计算得到的电网谐波阻抗特性,其阻抗幅值和相位的绝对误差仅为考虑单组电容器投切时的25%,验证了所提方法的可行性。
Capacitor switching is a common operation to calculate network harmonic impedance, while by fully using data from packet capacitor switching network, the harmonic impedance characteristics can be calculated more accurately. Consequently, the Prony algorithm is used to filter steady component of voltage and current response, then transient component can be obtained. By discrete Fourier transform of the obtained voltage and current transient components, the network harmonic impedance characteristics of every capacitor switching can be calculated. Each network harmonic im- pedance characteristic is allocated a weight factor according to transient time domain energy, then cubic spline interpolation is used to fit impedance in discrete frequencies to form final network harmonic impedance characteristics. The simulation results show that, by using data from packet capacitor switching based on time domain energy weight fac- tor method, the calculated amplitude and phase of network harmonic impedance have a lower absolute error which is only 25% of those by using one group capacitor switching. Therefore, the proposed method is testified feasible.
出处
《高电压技术》
EI
CAS
CSCD
北大核心
2016年第10期3354-3360,共7页
High Voltage Engineering
基金
国家自然科学基金(51277137
51307126)~~
关键词
谐波阻抗特性
电能质量
电容器组投切
能量权重
阻抗测量
PRONY算法
harmonic impedance characteristics
power quality
packet capacitor switching
energy weight
impedance measurement
Prony algorithm
