摘要
针对电网的谐波干扰,提出了一种在锁相环(PLL)中有效估计和消除电网谐波的方法。这种谐波估计算法的设计主要用于电网连接的新能源系统(RES),采用负反馈,在使用虚拟阻抗和下垂控制的基础上来估计每一个高次谐波成分。这种方法先消除没有估算之前的电网电压谐波,然后将滤波后的信号通过分频控制来得到电网电压分量的相位差,然后通过d,q坐标系即可运用很少的运算精确估计出电网电压的谐波,仿真和实验结果表明该算法实现非常快,且能对公用电网的相位、谐波进行精确估计。
An efficient and effective method to estimate utility grid harmonics and eliminate their effect during phase locked loop（PLL） phase estimation is proposed.This harmonics estimation algorithm is designed primarily for grid-conected renewable energy systems（RES）.The method uses negative feedback to estimate higher harmonic components by using of virtual impedance and droop control.The method eliminates grid voltage harmonics with no estimation.Then the harmonic free signal will be used by the PLL to estimate the phase of the fundamental component of the grid voltage.So we can use simple computing to estimate the power operation voltage harmonic accurately through d,q coordinate system.The simulation and experimental results verify that the algorithm achieves very fast and accurate ph- ase and harmonic estimation on highly distorted utility grids.
出处
《电力电子技术》
CSCD
北大核心
2015年第1期67-69,共3页
Power Electronics
基金
湖南省自然科学基金(2011JJ5027)~~
关键词
可再生能源系统
谐波估计
混合误差估计
renewable energy systems
harmonic estimation
mixed error estimation
